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Original article
Growth, tolerance, and enzyme activities of Trichoderma strains in culture media added with a pyrethroids-based insecticide
Crecimiento, tolerancia y actividades enzimáticas de cepas de Trichoderma en medios de cultivo adicionados con un insecticida a base de piretroides
Caliope Mendarte-Alquisira, Alejandro Alarcón, Ronald Ferrera-Cerrato
Corresponding author
rferreracerrato@gmail.com

Corresponding author.
Área de Microbiología, Posgrado de Edafología, Colegio de Postgraduados, Carretera Federal México-Texcoco km 36.5, Montecillo 56264, Estado de México, Mexico
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Introduction</span><p id="par0025" class="elsevierStylePara elsevierViewall">After the prohibition of using the highly toxic and persistent dichloro diphenyl trichloroethane &#40;DDT&#41;&#44; alternate insecticides based on carbamates and pyrethroids &#40;single or combined&#41; began to be utilized for controlling insect pests<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">17</span></a>&#46; However&#44; these insecticides may also represent potential issues for human and environmental health<a class="elsevierStyleCrossRef" href="#bib0485"><span class="elsevierStyleSup">47</span></a>&#46; Some carbamates such as propoxur or pyrethroids such as permethrin and prallethrin may have carcinogenic and mutagenic properties&#44; and inflammatory effects in the stomach&#59; in addition&#44; they are also associated with alterations in functional sodium channels and poor motor development in children<a class="elsevierStyleCrossRefs" href="#bib0375"><span class="elsevierStyleSup">25&#44;30&#44;44</span></a>&#46; Furthermore&#44; several studies reported the effect of carbamates and pyrethroids on beneficial bacteria and communities in the rhizosphere<a class="elsevierStyleCrossRefs" href="#bib0300"><span class="elsevierStyleSup">10&#44;35&#44;36&#44;38&#44;47</span></a>&#46; Therefore&#44; research focused on improving strategies for integrated pest management&#44; which includes the combination of organically-derived pesticides and the application of antagonist microorganisms to reduce chemical damage induced by insecticides in the environment<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">38</span></a>&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Trichoderma</span> genus includes worldwide ubiquitous fungi commonly found in soils and possesses a powerful and versatile enzymatic machinery &#40;including cellulases&#44; chitinases&#44; peroxidases&#44; and proteases&#44; among others&#41; which may degrade a wide range of organic recalcitrant compounds in soil<a class="elsevierStyleCrossRefs" href="#bib0265"><span class="elsevierStyleSup">3&#44;29&#44;41</span></a>&#46; Commonly&#44; <span class="elsevierStyleItalic">Trichoderma</span> is one of the widest fungi directed to control plant pathogens since they produce enzymes with hydrolytic capacity and secondary metabolites related to processes such as antibiosis&#44; space competition&#44; plant growth improvement&#44; and resistance against biotic and abiotic stresses<a class="elsevierStyleCrossRefs" href="#bib0385"><span class="elsevierStyleSup">27&#44;32&#44;37</span></a>&#46; Furthermore&#44; <span class="elsevierStyleItalic">Trichoderma</span> spp&#46; are tolerant to many agrochemicals and have the potential to degrade chemical pesticides because they possess specific enzymes to metabolize such compounds<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">8</span></a>&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Therefore&#44; the aims of this research were &#40;1&#41; to determine the tolerance of several strains of <span class="elsevierStyleItalic">Trichoderma</span> to solid culture medium contaminated with commercial insecticide H24&#174; &#40;composed of pyrethroids&#44; permethrin and prallethrin&#44; and carbamate propoxur&#41; and &#40;2&#41; to evaluate the effect of this insecticide on the release of enzymes such as chitinases&#44; peroxidases&#44; and endoglucanases by selected <span class="elsevierStyleItalic">Trichoderma</span> strains grown in liquid culture medium&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Materials and methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Microbiological materials</span><p id="par0040" class="elsevierStylePara elsevierViewall">This research utilized ten strains of <span class="elsevierStyleItalic">Trichoderma</span>&#58; Trich CP01 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41;&#44; Trich CP03 &#40;<span class="elsevierStyleItalic">T&#46; koningii</span>&#41;&#44; Trich CP04 &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41;&#44; Trich CP022 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41;&#44; Trich CP023 &#40;<span class="elsevierStyleItalic">T&#46; koningii</span>&#41;&#44; Trich CP037 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41; Trich CP038 &#40;<span class="elsevierStyleItalic">T&#46; harzianum</span>&#41;&#44; Trich CP056 &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41;&#44; Trich CP0X &#40;<span class="elsevierStyleItalic">T&#46; atroviride</span>&#41;&#44; Trich CP0TGC &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41;&#44; and one strain of <span class="elsevierStyleItalic">Phanerochaete chrysosporium</span>-ATCC 34540 &#40;CDBB 686&#41; as referential fungus able to degrade toxic organic contaminants&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">All <span class="elsevierStyleItalic">Trichoderma</span> strains are part of the microbial collection of the Microbiology Laboratory &#40;Colegio de Postgraduados&#41;&#44; which were reported as tolerant to crude oil&#44; and to high concentrations of naphthalene&#44; phenanthrene&#44; and benzo&#91;<span class="elsevierStyleItalic">a</span>&#93;pyrene<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">2</span></a>&#46; The strain of <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 &#40;CDBB 686&#41; was acquired from the CINVESTAV microbial repository and reported as tolerant and degrader of persistent organic pollutants&#44; including insecticides<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">24</span></a>&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Chemical reagents and culture media</span><p id="par0050" class="elsevierStylePara elsevierViewall">The commercial insecticide H24&#174; contains permethrin &#40;360<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#41;&#44; propoxur &#40;890<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#41; and prallethrin &#40;50<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#41; as active ingredients&#59; thus&#44; the total of active ingredients yields up to 1300<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#44; which are dissolved in an organic solvent&#46; This commercial insecticide is commonly applied for controlling flying and crawling insects that attack cotton crops due to its active ingredient permethrin&#46; Potato dextrose agar &#40;PDA&#41; medium &#40;BD Bioxon&#174;&#41; was prepared according to the manufacturer&#39;s specifications and different concentrations of the commercial insecticide &#40;0&#44; 50&#44; 100&#44; 150&#44; and 200<span class="elsevierStyleHsp" style=""></span>ppm&#41; were added to it&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The liquid culture consisted of a mineral medium &#40;MM&#41; prepared in accordance with Gao et al&#46; with some modifications<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">13</span></a>&#46; The MM contained &#40;g&#47;l&#41;&#58; 1&#46;0 K<span class="elsevierStyleInf">2</span>HPO<span class="elsevierStyleInf">4</span>&#44; 0&#46;5 KCl&#44; 0&#46;5 MgSO<span class="elsevierStyleInf">4</span>&#183;7H<span class="elsevierStyleInf">2</span>O&#44; 0&#46;01 FeSO<span class="elsevierStyleInf">4</span>&#44; pH 7&#46;0&#46; The nitrogen source was meat peptone &#40;CAS 91079-38-8&#44; Merck&#41;&#44; considering a nitrogen content of &#8764;12&#46;5&#37; and nitrogen in the insecticide &#40;propoxur&#41;&#44; the carbon source was sucrose and that carbon derived from the insecticide&#46; The final C&#47;N ratio was &#8764;20&#47;1&#44; considering 100<span class="elsevierStyleHsp" style=""></span>ppm of active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41; in commercial insecticide H24&#174;&#46; Both media were autoclaved at 121<span class="elsevierStyleHsp" style=""></span>&#176;C for 15<span class="elsevierStyleHsp" style=""></span>min&#59; afterwards&#44; the H24&#174; insecticide was added using filtration&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Bioassay 1&#46; Fungal growth and tolerance to increased concentrations of commercial insecticide</span><p id="par0060" class="elsevierStylePara elsevierViewall">Agar disks of 5<span class="elsevierStyleHsp" style=""></span>mm in diameter with fungal mycelium were sown in Petri dishes containing solid PDA medium with or without the commercial insecticide &#40;four replicates per treatment&#41;&#59; all fungal cultures were incubated at 28<span class="elsevierStyleHsp" style=""></span>&#176;C for 96<span class="elsevierStyleHsp" style=""></span>h&#46; The growth diameter was measured every 24<span class="elsevierStyleHsp" style=""></span>h&#44; for 4 days&#46; The results were used to estimate the radial growth&#44; radial growth rate&#44; radial growth rate inhibition &#40;&#37;&#41; &#40;RGRI&#37;&#41;&#44; and the inhibitory dose 50 &#40;ID<span class="elsevierStyleInf">50</span>&#41;<a class="elsevierStyleCrossRefs" href="#bib0390"><span class="elsevierStyleSup">28&#44;34</span></a>&#46; The radial growth rate was calculated with the quadratic equation that was fitted to the dose&#8211;response curve for each strain&#46; The radial growth rate was used to estimate the &#40;ID<span class="elsevierStyleInf">50</span>&#41; for each strain and the RGRI&#37;<a class="elsevierStyleCrossRefs" href="#bib0390"><span class="elsevierStyleSup">28&#44;34</span></a>&#46; The ID<span class="elsevierStyleInf">50</span> was also utilized as a reference to define a sub-ID<span class="elsevierStyleInf">50</span> without inhibiting the growth and further estimations<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">33</span></a>&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Bioassay 2&#46; Fungal protein content and induced peroxidase&#44; chitinase&#44; and glucanase activities in a liquid medium containing&#47;contaminated with 100<span class="elsevierStyleHsp" style=""></span>ppm of commercial insecticide</span><p id="par0065" class="elsevierStylePara elsevierViewall">Four tolerant strains of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; &#40;a consortium of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46;&#41; selected from Bioassay 1&#44; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 were used for evaluating the effect of a sub-ID<span class="elsevierStyleInf">50</span> of commercial insecticide H24&#174; on the enzymatic activities of interest&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The initial fungal inoculum was adjusted for applying 1<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">6</span> spores ml of the <span class="elsevierStyleItalic">Trichoderma</span> consortium &#40;adding the same number of spores per each fungal strain&#41;&#44; and 1<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">6</span> spores ml of <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540&#46; Fungal cultures were maintained for 8 days at 200<span class="elsevierStyleHsp" style=""></span>rpm and 28<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Afterwards&#44; protein analysis and enzyme tests were performed&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Protein content was determined with the Biuret method by using bovine albumin as standard<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">14</span></a>&#46; The reaction mixture contained 100<span class="elsevierStyleHsp" style=""></span>&#956;l of fungal supernatant and 1000<span class="elsevierStyleHsp" style=""></span>&#956;l of Biuret reagent&#46; This mixture was incubated for 30<span class="elsevierStyleHsp" style=""></span>min at room temperature &#40;20&#8211;25<span class="elsevierStyleHsp" style=""></span>&#176;C&#41;&#46; Then&#44; absorbance readings at 540<span class="elsevierStyleHsp" style=""></span>nm were taken by using a spectrophotometer &#40;Synergy 2&#44; Biotek&#174;&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">Non-specific peroxidase &#40;POX&#44; EC 1&#46;11&#46;1&#46;7&#41; activity was measured in 96-well microplates by mixing 20<span class="elsevierStyleHsp" style=""></span>&#956;l of the fungal supernatant with 190<span class="elsevierStyleHsp" style=""></span>&#956;l of phosphate buffer &#40;50<span class="elsevierStyleHsp" style=""></span>mM&#44; pH 7&#46;0&#41;&#44; 10<span class="elsevierStyleHsp" style=""></span>&#956;l of guaiacol 1&#37;&#44; and 20<span class="elsevierStyleHsp" style=""></span>&#956;l of H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> in phosphate buffer &#40;50<span class="elsevierStyleHsp" style=""></span>mM&#44; pH 7&#46;0&#41;&#46; Absorbance readings at 450<span class="elsevierStyleHsp" style=""></span>nm were taken from this mixture every 15<span class="elsevierStyleHsp" style=""></span>s for 5<span class="elsevierStyleHsp" style=""></span>min&#44; by using a spectrophotometer &#40;Synergy 2&#44; Biotek&#174;&#41;&#46; POX activity was calculated using a molar extinction coefficient &#40;<span class="elsevierStyleItalic">&#603;</span>&#41; of 16&#46;8&#47;mM<span class="elsevierStyleHsp" style=""></span>cm&#46; One unit of POX activity is defined as the amount of enzyme that catalyzes the formation of 1<span class="elsevierStyleHsp" style=""></span>&#956;mol of tetraguaiacol per min at 25<span class="elsevierStyleHsp" style=""></span>&#176;C and pH 7&#46;0<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">7</span></a>&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Chitinase activity &#40;GlcNAc activity&#41; was measured by using the method proposed by Vargas-Hoyos and Gilchrist-Ramelli&#44; using N-acetyl-<span class="elsevierStyleSmallCaps">d</span>-glucosamine &#40;GlcNAc&#41; as standard<a class="elsevierStyleCrossRefs" href="#bib0360"><span class="elsevierStyleSup">22&#44;42</span></a>&#46; Thus&#44; 500<span class="elsevierStyleHsp" style=""></span>&#956;l of fungal supernatant was mixed with 100<span class="elsevierStyleHsp" style=""></span>&#956;l of colloidal chitin in sodium citrate buffer &#40;50<span class="elsevierStyleHsp" style=""></span>mM&#44; pH 5&#46;2&#41;&#44; and incubated for 30<span class="elsevierStyleHsp" style=""></span>min at 40<span class="elsevierStyleHsp" style=""></span>&#176;C&#59; then&#44; the mixture was cooled at ambient temperature &#40;20&#8211;25<span class="elsevierStyleHsp" style=""></span>&#176;C&#41;&#44; and 2000<span class="elsevierStyleHsp" style=""></span>&#956;l of dinitrosalicylic acid &#40;DNS&#41; were added&#44; for further incubation at 90<span class="elsevierStyleHsp" style=""></span>&#176;C for 5<span class="elsevierStyleHsp" style=""></span>min&#46; The reaction mixture was cooled with iced water&#44; and absorbance readings were measured at 540<span class="elsevierStyleHsp" style=""></span>nm in a Synergy 2&#44; Biotek&#174; spectrophotometer&#46; One unit of GlcNAc activity was defined as the amount of the enzyme necessary to liberate 1<span class="elsevierStyleHsp" style=""></span>&#956;mol&#47;min of reducing sugar &#40;glucose&#41;&#46; Enzyme activity was expressed in units per mg of protein&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">&#946;-1&#44;4-Glucanase activity &#40;CMCase activity&#41; was quantified by the DNS technique using <span class="elsevierStyleSmallCaps">d</span>-glucose as standard<a class="elsevierStyleCrossRefs" href="#bib0325"><span class="elsevierStyleSup">15&#44;22</span></a>&#46; The reaction mixture consisted of 500<span class="elsevierStyleHsp" style=""></span>&#956;l of carboxymethyl cellulose &#40;2&#37;&#41; in sodium citrate buffer &#40;50<span class="elsevierStyleHsp" style=""></span>mM&#44; pH 4&#46;8&#41; and 500<span class="elsevierStyleHsp" style=""></span>&#956;l of fungal supernatant&#46; The mixture was incubated for 30<span class="elsevierStyleHsp" style=""></span>min at 50<span class="elsevierStyleHsp" style=""></span>&#176;C and cooled at room temperature&#46; Then&#44; 5000<span class="elsevierStyleHsp" style=""></span>&#956;l of DNS solution was added and incubated at 90<span class="elsevierStyleHsp" style=""></span>&#176;C for 5<span class="elsevierStyleHsp" style=""></span>min&#59; the reaction was stopped by adding iced water&#46; Absorbance readings were taken at 540<span class="elsevierStyleHsp" style=""></span>nm in a spectrophotometer &#40;Synergy 2&#44; Biotek&#174;&#41;&#46; One unit of CMCase activity was defined as the amount of the enzyme necessary to liberate 1<span class="elsevierStyleHsp" style=""></span>&#956;mol&#47;min of glucose&#44; and the enzyme activity was expressed in terms of units per mg of protein&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Statistical analysis</span><p id="par0095" class="elsevierStylePara elsevierViewall">Data were analyzed by one-way ANOVA and by the mean comparison test &#40;Tukey&#44; <span class="elsevierStyleItalic">&#945;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41;&#46; Data represents the values of the means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;SE&#41;&#44; from four replicates for each treatment&#46; Analyses were performed using SPSS software&#44; version PASW 18 &#40;IBM SPSS-IBM Corp&#41;&#46;</p></span></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Results</span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Bioassay 1&#46; Fungal growth and tolerance to three concentrations of commercial insecticide</span><p id="par0100" class="elsevierStylePara elsevierViewall">In general&#44; all <span class="elsevierStyleItalic">Trichoderma</span> strains tolerated the presence of the commercial insecticide H24&#174; when applied at 50&#44; 100&#44; and 150<span class="elsevierStyleHsp" style=""></span>ppm&#46; Nevertheless&#44; the strains CP01 &#40;<span class="elsevierStyleItalic">Trichoderma virens</span>&#41;&#44; CP04 &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41;&#44; CP038 &#40;<span class="elsevierStyleItalic">T&#46; harzianum</span>&#41;&#44; CP056 &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41;&#44; and CP0TGC &#40;<span class="elsevierStyleItalic">T&#46; viride</span>&#41; stopped their growth after 72<span class="elsevierStyleHsp" style=""></span>h of exposure to 150<span class="elsevierStyleHsp" style=""></span>ppm of the commercial insecticide &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figs&#46; 1b&#8211;d</a>&#41;&#46; Only four <span class="elsevierStyleItalic">Trichoderma</span> strains &#40;CP03 <span class="elsevierStyleItalic">T&#46; koningii</span>&#44; CP022 <span class="elsevierStyleItalic">T&#46; virens</span>&#44; CP037 <span class="elsevierStyleItalic">T&#46; virens</span>&#44; and CP0X <span class="elsevierStyleItalic">T&#46; atroviride</span>&#41; tolerated the application of the insecticide at 200<span class="elsevierStyleHsp" style=""></span>ppm &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>e&#41;&#46; Fungal adaptation to the insecticide occurred after 24<span class="elsevierStyleHsp" style=""></span>h when all <span class="elsevierStyleItalic">Trichoderma</span> strains exposed to 50&#44; 100&#44; 150&#44; and 200<span class="elsevierStyleHsp" style=""></span>ppm showed visible mycelial growth &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figs&#46; 1b&#8211;e</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0105" class="elsevierStylePara elsevierViewall">The growth rate of <span class="elsevierStyleItalic">Trichoderma</span> strains and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 in a solid medium &#40;PDA&#41; containing 0&#44; 50&#44; 100&#44; 150&#44; and 200<span class="elsevierStyleHsp" style=""></span>ppm of active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41; of the commercial insecticide was determined&#46; The tested concentrations had a negative effect on the radial growth rate of all <span class="elsevierStyleItalic">Trichoderma</span> strains and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 when compared to their respective control without insecticide&#46; The radial growth rate achieved at 150<span class="elsevierStyleHsp" style=""></span>ppm oscillated between &#8764;0&#46;50 and &#8764;0&#46;09<span class="elsevierStyleHsp" style=""></span>mm&#47;h&#44; while the radial growth rate for tolerant strains at 200<span class="elsevierStyleHsp" style=""></span>ppm was between &#8764;0&#46;53 and &#8764;0&#46;17<span class="elsevierStyleHsp" style=""></span>mm&#47;h &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>a&#41;&#46; Trich CP037 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41; showed the lowest radial growth rate when exposed to 200<span class="elsevierStyleHsp" style=""></span>ppm of the commercial insecticide &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0110" class="elsevierStylePara elsevierViewall">Data from radial growth rate and radial growth rate inhibition &#40;&#37;&#41; were used to obtain the inhibitory dose 50 &#40;ID<span class="elsevierStyleInf">50</span>&#41; of the commercial insecticide &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; ID<span class="elsevierStyleInf">50</span> showed variations among all fungal strains&#46; The values of the ID<span class="elsevierStyleInf">50</span> for those tolerant strains &#40;Trich CP01&#59; Trich CP04&#59; Trich CP023&#59; Trich CP038&#59; Trich CP056&#59; Trich CP0TGC&#41; exposed to 150<span class="elsevierStyleHsp" style=""></span>ppm ranged from 77&#46;27 to 107&#46;66<span class="elsevierStyleHsp" style=""></span>ppm&#46; Moreover&#44; the values of the ID<span class="elsevierStyleInf">50</span> for those tolerant strains &#40;Trich CP03&#59; Trich CP022&#59; Trich CP037&#59; Trich CP0X&#59; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540&#41; exposed to 200<span class="elsevierStyleHsp" style=""></span>ppm ranged between 131&#46;64 and 219&#46;04<span class="elsevierStyleHsp" style=""></span>ppm&#59; of these strains&#44; Trich CP037 showed the highest ID<span class="elsevierStyleInf">50</span> value &#40;219&#46;04<span class="elsevierStyleHsp" style=""></span>ppm&#41; when compared to that from <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0115" class="elsevierStylePara elsevierViewall">In addition&#44; ID<span class="elsevierStyleInf">50</span> was used for a proposed sub-ID<span class="elsevierStyleInf">50</span> for those fungal strains that tolerated 200<span class="elsevierStyleHsp" style=""></span>ppm of the commercial insecticide&#46; This sub-ID<span class="elsevierStyleInf">50</span> was utilized for Bioassay 2 to determine the enzyme activities from a <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; consortium and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Bioassay 2&#46; Fungal growth&#44; protein content&#44; and induced peroxidase&#44; chitinase&#44; and glucanase activities in a liquid medium containing 100<span class="elsevierStyleHsp" style=""></span>mg&#47;l of commercial insecticide</span><p id="par0120" class="elsevierStylePara elsevierViewall">The <span class="elsevierStyleItalic">Trichoderma</span> consortium &#91;Trich CP03 &#40;<span class="elsevierStyleItalic">T&#46; koningii</span>&#41;&#44; Trich CP022 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41;&#44; Trich CP037 &#40;<span class="elsevierStyleItalic">T&#46; virens</span>&#41;&#44; and Trich CP0X &#40;<span class="elsevierStyleItalic">T&#46; atroviride</span>&#41;&#93;&#44; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540&#44; were exposed to 100<span class="elsevierStyleHsp" style=""></span>ppm of the active ingredient of the commercial insecticide&#46; After eight days&#44; either the <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; consortium or <span class="elsevierStyleItalic">P&#46; chrysosporium</span> grew and released proteins and enzymes into the contaminated liquid culture &#40;<a class="elsevierStyleCrossRefs" href="#fig0015">Figs&#46; 3 and 4</a>&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0125" class="elsevierStylePara elsevierViewall">In the present study&#44; we observed that the growth of the <span class="elsevierStyleItalic">Trichoderma</span> consortium and <span class="elsevierStyleItalic">P&#46; chrysosporium</span> was not affected by the active ingredients contained in the commercial insecticide &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>a&#41;&#46; However&#44; in the absence and presence of insecticides&#44; the biomass of the <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; consortium was significantly higher &#40;&#8764;7-fold&#41; than that of <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">The strain of <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 produced more protein than the <span class="elsevierStyleItalic">Trichoderma</span> consortium in the absence or presence of the insecticide&#46; The insecticide significantly influenced the protein production in the <span class="elsevierStyleItalic">Trichoderma</span> consortium and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#44; whose protein content increased by &#8764;1&#46;3-fold under the contaminated culture &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>b&#41;&#46;</p><p id="par0135" class="elsevierStylePara elsevierViewall">On the other hand&#44; without the insecticide&#44; the <span class="elsevierStyleItalic">Trichoderma</span> consortium had significantly higher &#40;&#8764;1&#46;8-fold&#41; POX activity than <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#44; reaching levels of &#8764;6000<span class="elsevierStyleHsp" style=""></span>U&#47;&#956;g protein when compared to <span class="elsevierStyleItalic">P&#46; chrysosporium</span> &#40;&#8764;3250<span class="elsevierStyleHsp" style=""></span>U&#47;&#956;g protein&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>c&#41;&#46; Under insecticide contamination&#44; POX activity increased in both fungal cultures&#59; for the <span class="elsevierStyleItalic">Trichoderma</span> consortium&#44; an increase of POX was achieved &#40;&#8764;1&#46;4-fold&#41;&#44; whereas for <span class="elsevierStyleItalic">P&#46; chrysosporium</span> the increase of POX was about &#8764;2&#46;1-fold than that of the respective control in the absence of the insecticide&#46; Overall&#44; the POX activity of the <span class="elsevierStyleItalic">Trichoderma</span> consortium was slightly higher &#40;&#8764;1&#46;2-fold&#41; but not significant&#44; as determined for <span class="elsevierStyleItalic">P&#46; chrysosporium</span> &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>c&#41;&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">The chitinase activity &#40;GlcNAc activity&#41; for the <span class="elsevierStyleItalic">Trichoderma</span> consortium was higher &#40;&#8764;1&#46;2-fold&#41; than that achieved for <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#44; either in the absence or presence of the insecticide &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>a&#41;&#46; Overall&#44; the application of the insecticide caused a 25&#37; decrease in the GlcNAc activity of both fungal cultures&#59; however&#44; the GlcNAc activity in the <span class="elsevierStyleItalic">Trichoderma</span> consortium was always significantly higher &#40;&#8764;1&#46;2-fold&#41; than that in <span class="elsevierStyleItalic">P&#46; chrysosporium</span> &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>a&#41;&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">In the absence of the insecticide&#44; the CMCase activity for the <span class="elsevierStyleItalic">Trichoderma</span> consortium was significantly higher &#40;&#8764;1&#46;4-fold&#41; than the CMCase activity achieved by <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#46; The insecticide significantly decreased the CMCase activity of both fungal cultures&#59; overall&#44; the enzyme activity of the <span class="elsevierStyleItalic">Trichoderma</span> consortium was significantly higher &#40;&#8764;1&#46;3-fold&#41; than that of <span class="elsevierStyleItalic">P&#46; chrysosporium</span> &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>b&#41;&#46;</p></span></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Discussion</span><p id="par0150" class="elsevierStylePara elsevierViewall">Many microorganisms grow in the presence of pesticides&#44; and this ability is influenced by chemical&#44; physical&#44; biochemical&#44; and environmental conditions&#44; and also depends on the amount and type of pesticides<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">36</span></a>&#46; The initial fungal response to contaminants reflects the initial adaptation to stressful cultural conditions and&#47;or to contaminated environments<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">20</span></a>&#46; Synthetic pyrethroids &#40;cypermethrin&#44; deltamethrin&#44; permethrin&#44; and others&#41; and carbamates such as propoxur may reduce the growth of bacteria and filamentous fungi such as <span class="elsevierStyleItalic">T&#46; viride</span>&#44; <span class="elsevierStyleItalic">T&#46; harzianum</span>&#44; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span> strains<a class="elsevierStyleCrossRefs" href="#bib0255"><span class="elsevierStyleSup">1&#44;10&#44;23&#44;36&#44;47</span></a>&#46; Conversely to our results&#44; Schumacher and Poheling did not find negative effects of permethrin on the growth of <span class="elsevierStyleItalic">Metarhizium</span><span class="elsevierStyleItalic">anisopliae</span><a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">35</span></a>&#46; On the other hand&#44; pyrethroids such as allethrin &#40;50<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41; did not affect the growth of <span class="elsevierStyleItalic">Fusarium proliferatum</span> CF2<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">4</span></a>&#46; Consistently to our results&#44; Deng et al&#46; observed that pyrethroids such as &#946;-cypermethrin &#40;100<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41; did not affect the final biomass produced by <span class="elsevierStyleItalic">Aspergillus niger</span> YAT&#59; however&#44; its radial growth was delayed<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">10</span></a>&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">The mixture of pyrethroids&#44; &#946;-cypermethrin&#44; deltamethrin&#44; fenvalerate&#44; and &#945;-cyhalothrin &#40;100&#8211;1000<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41;&#44; reduced the growth in <span class="elsevierStyleItalic">T&#46; viride</span> and <span class="elsevierStyleItalic">P&#46;</span><span class="elsevierStyleItalic">chrysosporium</span><a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">36</span></a>&#46; In soils&#44; the application of cypermethrin and chlorpyrifos alone and in combination dramatically decreased both bacterial and fungal populations<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">39</span></a>&#46; The latter indicates that microorganisms require a certain period of adaptation to toxic contaminants to produce those necessary molecules for tolerating such compounds<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">1</span></a>&#46; In the present study&#44; the commercial product has a mixture of two pyrethroids &#40;permethrin&#44; prallethrin&#41; with carbamate &#40;propoxur&#41;&#44; and this combination exerts certain toxicity which significantly delayed the growth of all fungal strains&#46; This effect could be due to the synergy between carbamates and pyrethroids by which the toxicity to microbes may increase<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">17</span></a>&#46;</p><p id="par0160" class="elsevierStylePara elsevierViewall">Some studies have demonstrated the ability of <span class="elsevierStyleItalic">Trichoderma</span> strains for tolerating and growing in the presence of organic compounds such as petroleum hydrocarbons and pyrethroids<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">2&#44;6&#44;36</span></a>&#46; Furthermore&#44; these fungi may use organic molecules as carbon and energy source since they have the enzymes necessary to perform such metabolism<a class="elsevierStyleCrossRefs" href="#bib0340"><span class="elsevierStyleSup">18&#44;45</span></a>&#46; The fungus identified as part of the genus <span class="elsevierStyleItalic">Cladosporium</span> was reported as tolerant to pyrethroids&#44; including &#946;-cypermethrin&#44; deltamethrin&#44; bifenthrin and permethrin &#40;100<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">8</span></a>&#46; Other studies include fungi such as <span class="elsevierStyleItalic">Aspergillus oryzae</span> and <span class="elsevierStyleItalic">Cunninghamella elegans</span>&#44; exposed to pyrethroids&#44; cyhalothrin and 3-phenoxybenzoic acid&#44; an intermediate in the degradation of permethrin<a class="elsevierStyleCrossRefs" href="#bib0405"><span class="elsevierStyleSup">31&#44;49</span></a>&#46;</p><p id="par0165" class="elsevierStylePara elsevierViewall">Consortium cultures are better than individual cultures because there are complementary physiological and biochemical functions among microorganisms&#44; i&#46;e&#46;&#44; while some microorganisms perform specific enzymatic activity&#44; other microorganisms can perform some different enzyme activities&#44; by which all the involved organisms may be benefited<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">40</span></a>&#46; Enzyme activities include superoxide dismutases &#40;SOD&#41;&#44; peroxidases &#40;POXs&#41;&#44; catalases &#40;CAT&#41;&#44; chitinases&#44; glucanases&#44; and many others&#46;</p><p id="par0170" class="elsevierStylePara elsevierViewall">In nature&#44; microorganisms coexist in consortia and interact with each other to transform organic materials<a class="elsevierStyleCrossRefs" href="#bib0380"><span class="elsevierStyleSup">26&#44;40</span></a>&#46; Artificial and natural microbial consortia are being studied for assessing tolerance&#44; removal&#44; and degradation of inorganic and organic compounds<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">40</span></a>&#46; However&#44; little attention is given to filamentous fungi and their tolerance to insecticides as accounted for bacteria<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">9</span></a>&#46; Moreover&#44; research about fungal consortia exposed to pyrethroids and carbamates utilized as substitutes for DDT is scant&#46; Furthermore&#44; many fungi may remove or degrade inorganic and organic compounds from polluted systems through several biochemical processes which include antioxidant molecules and enzymes such as POXs&#46; In this regard&#44; POXs have antioxidant activity and are involved in the detoxification of reactive oxygen species &#40;ROS&#41; such as H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> accumulation in cells because these enzymes oxidize H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> and are involved in the detoxification processes of organic pollutants<a class="elsevierStyleCrossRefs" href="#bib0345"><span class="elsevierStyleSup">19&#44;46</span></a>&#46; Other extracellular fungal POXs &#40;lignin peroxidase&#44; manganese peroxidase&#44; and versatile peroxidase VP&#41; are involved in the removal and degradation of pollutants such as polycyclic aromatic hydrocarbons &#40;PAHs&#41;&#44; dye-based textile effluents&#44; polychlorinated biphenyls&#44; fungicides&#44; and pesticides<a class="elsevierStyleCrossRef" href="#bib0480"><span class="elsevierStyleSup">46</span></a>&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">Our results concur with those findings in white-rot fungi such as <span class="elsevierStyleItalic">Polyporus tricholoma</span>&#44; <span class="elsevierStyleItalic">Cilindrobasidium leave</span>&#44; and <span class="elsevierStyleItalic">Deconica citrispora</span> that increased POX activity &#40;especially MnP&#41; when exposed to paraquat&#44; a widely applied herbicide in agriculture whose chemical structure resembles that of lignin<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">5</span></a>&#46; In addition&#44; <span class="elsevierStyleItalic">P&#46; chrysosporium</span> can degrade a wide variety of organic pollutants due to the activity of non-specific extracellular POXs<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">24</span></a>&#46; Furthermore&#44; non-ligninolytic fungi such as <span class="elsevierStyleItalic">Aspergillus</span>&#44; <span class="elsevierStyleItalic">Fusarium</span>&#44; and <span class="elsevierStyleItalic">Trichoderma</span> may transform environmental pollutants such as PAHs&#44; pesticides&#44; and dyes&#44; releasing POX enzymes<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">21</span></a>&#46; Zhao et al&#46; proposed that <span class="elsevierStyleItalic">A&#46; oryzae</span> M4 uses some POXs in the presence of NADPH and O<span class="elsevierStyleInf">2</span>&#44; for degrading 3-phenoxybenzoic acid&#44; a subproduct of permethrin degradation<a class="elsevierStyleCrossRef" href="#bib0490"><span class="elsevierStyleSup">48</span></a>&#46; <span class="elsevierStyleItalic">Trichoderma asperellum</span> H15 was exposed to PAHs with 3&#8211;5 rings &#40;phenanthrene&#44; pyrene&#44; and benzo&#91;<span class="elsevierStyleItalic">a</span>&#93;pyrene&#41;&#44; and the fungal POX activity increased after 4 days of exposure<a class="elsevierStyleCrossRef" href="#bib0480"><span class="elsevierStyleSup">46</span></a>&#46; Many POXs were identified in <span class="elsevierStyleItalic">T&#46; asperellum</span>&#44; including cytochrome C peroxidases&#44; catalases&#44; glutathione peroxidase&#44; and dye-decolorizing peroxidases<a class="elsevierStyleCrossRef" href="#bib0480"><span class="elsevierStyleSup">46</span></a>&#46; Most fungi&#44; including <span class="elsevierStyleItalic">P&#46; chrysosporium</span> and <span class="elsevierStyleItalic">Trichoderma</span> sp&#46;&#44; are studied for degrading or removing PAHs&#44; organochloride pesticides&#44; organophosphates&#44; carbamates&#44; and pyrethroids such as &#946;-cypermethrin and deltamethrin&#44; by means of the oxidative effects of POXs<a class="elsevierStyleCrossRefs" href="#bib0305"><span class="elsevierStyleSup">11&#44;12&#44;24&#44;43</span></a>&#46; In our results&#44; the POX activity detected in the <span class="elsevierStyleItalic">Trichoderma</span> consortium was higher than that of <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#44; which may be explained in part&#44; by the fact that the <span class="elsevierStyleItalic">Trichoderma</span> consortium was integrated by four fungal strains&#44; and thus&#44; all strains may have released more POX enzymes&#46;</p><p id="par0180" class="elsevierStylePara elsevierViewall">The studies of POXs involved in either the removal or degradation of pyrethroids such as permethrin and prallethrin&#44; and carbamates such as propoxur&#44; are still little explored&#46; Our results suggest that the <span class="elsevierStyleItalic">Trichoderma</span> consortium and <span class="elsevierStyleItalic">P&#46; chrysosporium</span> increase their POX activities for tolerating the commercial insecticide in liquid culture&#46; However&#44; further studies are needed to identify specific POXs that participate during this process&#44; and to determine whether these enzymes act on both the degradation and detoxification of insecticides and byproducts&#44; as well&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">On the other hand&#44; chitinases play a key role in the transformation of chitin and are widely distributed in nature with a wider range of biotechnological applications&#44; including the biocontrol of fungal phytopathogens&#44; harmful insects&#44; bioconversion of chitin wastes&#44; to single-cell protein&#44; biopesticides&#44; among others<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">37</span></a>&#46; Moreover&#44; chitinases are important for maintaining the balance of carbon and nitrogen ratio in ecosystems<a class="elsevierStyleCrossRefs" href="#bib0385"><span class="elsevierStyleSup">27&#44;32&#44;37</span></a>&#46; Regarding chitin degradation&#44; the chitinase family includes three enzymes that act separately&#44; &#40;1&#41; endochitinases that recognize <span class="elsevierStyleItalic">o</span>-glycosyl bonds between chito-saccharide residues for catalysis and produce multimers of oligosaccharides&#44; especially diacetylchitobiose&#59; &#40;2&#41; exochitinases that release soluble low molecular weight dimers&#44; and &#40;3&#41; chitobiose that hydrolyses diacetylchitobiose to N-acetyl-glucosamine &#40;GlcNAc&#41;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">41</span></a>&#46; Both bacteria and fungi use chitin as a carbon and energy source&#44; and the production of chitinolytic enzymes is related to carbon sources in synthetic culture media<a class="elsevierStyleCrossRefs" href="#bib0410"><span class="elsevierStyleSup">32&#44;41</span></a>&#46;</p><p id="par0190" class="elsevierStylePara elsevierViewall">Chitinases produced by <span class="elsevierStyleItalic">Trichoderma</span> correspond to enzymes that function as biological control agents and are responsible for the lysis and degradation of fungal cell walls and insect cuticles<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">16</span></a>&#46; Furthermore&#44; the exposure of <span class="elsevierStyleItalic">Paenibacillus</span> sp&#46; to pyrethroids &#40;cypermethrin&#41; at concentrations recommended for field applications&#44; caused the total inhibition of chitinase production&#44; whereas insecticides such as methyl parathion and endosulfan significantly decreased &#40;30&#8211;40&#37;&#41; the activity and stability of chitinases<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">38</span></a>&#46; Organic molecules such as PAHs&#44; with four or more aromatic rings&#44; inhibited chitinase activities from <span class="elsevierStyleItalic">Aeromonas hydrophila</span> subsp&#46; <span class="elsevierStyleItalic">anaerogenes</span> A52 and from <span class="elsevierStyleItalic">T&#46;</span><span class="elsevierStyleItalic">harzianum</span><a class="elsevierStyleCrossRefs" href="#bib0395"><span class="elsevierStyleSup">29&#44;41</span></a>&#46; To our knowledge&#44; GlcNAc-activity has not been reported as being involved in the removal or degradation of organic pollutants such as pyrethroid and carbamate insecticides&#59; however&#44; this enzyme may serve as a biomarker for assessing detoxification processes of systems polluted with these compounds&#46;</p><p id="par0195" class="elsevierStylePara elsevierViewall">Endoglucanases &#40;EGs&#41; represent a group of dynamic cellulases that randomly attack internal <span class="elsevierStyleItalic">O</span>-glycosidic bonds of the cellulose chain&#44; releasing glucan chains with different lengths&#44; to generate new reducing and non-reducing ends&#59; thus&#44; EGs are the most important cellulases that contribute to the hydrolysis of cellulose<a class="elsevierStyleCrossRef" href="#bib0500"><span class="elsevierStyleSup">50</span></a>&#46; EGs have many biotechnological applications for the industry&#44; including animal food&#44; textiles&#44; laundry&#44; pulp and paper&#44; brewery and wine&#44; food&#44; and agriculture&#44; among others&#46; These enzymes are globally marketed from fungi such as <span class="elsevierStyleItalic">Aspergillus</span> and <span class="elsevierStyleItalic">Trichoderma</span><a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">3</span></a>&#46;</p><p id="par0200" class="elsevierStylePara elsevierViewall">Overall&#44; most studies are limited to reporting the degradation percentages of insecticides but not emphasizing the effects of insecticides on microbial biomolecules&#46; The production of a high number of enzymes&#44; and the optimal activity of these enzymes may depend on culture media and microorganisms&#46; The use of pyrethroids and carbamates increased as a result of the prohibition of DDT&#44; and these insecticides can disturb agricultural soils and may lead to several issues related to environmental and human health pollution&#46; Furthermore&#44; these organic chemicals may exert toxic effects on microorganisms and higher organisms&#46; The present study highlights that a commercial organic pesticide based on pyrethroids and carbamates may inhibit both the growth of filamentous fungi and the activity of important fungal enzymes involved in either chitin or cellulose degradation&#46;</p><p id="par0205" class="elsevierStylePara elsevierViewall">Overall&#44; increasing the concentrations of the active ingredient of the commercial insecticide H24&#174; decreased the radial growth rate in ten strains of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>&#46; Four prominent strains of <span class="elsevierStyleItalic">Trichoderma</span> &#91;<span class="elsevierStyleItalic">T&#46; koningii</span> &#40;Trich CP03&#41;&#44; <span class="elsevierStyleItalic">T&#46; virens</span> &#40;Trich CP022&#41;&#44; <span class="elsevierStyleItalic">T&#46; virens</span> &#40;Trich CP037&#41;&#44; and <span class="elsevierStyleItalic">T&#46; atroviride</span> &#40;Trich CP0X&#41;&#93; were able to tolerate 200<span class="elsevierStyleHsp" style=""></span>ppm of this commercial insecticide&#46; These four fungal strains grew in a liquid culture medium contaminated with 100<span class="elsevierStyleHsp" style=""></span>ppm of the commercial insecticide and showed increased protein production and high POX enzyme activity&#46; Moreover&#44; this commercial insecticide had negative effects on chitinase and endoglucanase activities derived from the <span class="elsevierStyleItalic">Trichoderma</span> consortium&#59; therefore&#44; it should be considered when using these microorganisms in combination with organic insecticides addressed to integrated pest management&#44; and for assessing tolerance&#44; detoxification&#44; or degradation of organic insecticides based on permethrin&#44; prallethrin and propoxur&#44; for instance&#46;</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Conflict of interest</span><p id="par0210" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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              "titulo" => "Bioassay 1&#46; Fungal growth and tolerance to increased concentrations of commercial insecticide"
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              "titulo" => "Bioassay 2&#46; Fungal protein content and induced peroxidase&#44; chitinase&#44; and glucanase activities in a liquid medium containing&#47;contaminated with 100 ppm of commercial insecticide"
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              "titulo" => "Bioassay 1&#46; Fungal growth and tolerance to three concentrations of commercial insecticide"
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              "titulo" => "Bioassay 2&#46; Fungal growth&#44; protein content&#44; and induced peroxidase&#44; chitinase&#44; and glucanase activities in a liquid medium containing 100 mg&#47;l of commercial insecticide"
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    "highlights" => array:2 [
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      "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall"><ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">&#8226;</span><p id="par0005" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Trichoderma</span> spp&#46; strains tolerate 200<span class="elsevierStyleHsp" style=""></span>ppm of pyrethroids and carbamate insecticides&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">&#8226;</span><p id="par0010" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Trichoderma</span> spp&#46; consortium growth in liquid culture with 100<span class="elsevierStyleHsp" style=""></span>ppm of insecticide&#46;</p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">&#8226;</span><p id="par0015" class="elsevierStylePara elsevierViewall">Insecticide promotes the release of proteins and peroxidases by <span class="elsevierStyleItalic">Trichoderma</span> spp&#46;</p></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">&#8226;</span><p id="par0020" class="elsevierStylePara elsevierViewall">Insecticide decreases chitinase and endoglucanase produced by <span class="elsevierStyleItalic">Trichoderma</span> spp&#46;</p></li></ul></p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">The application of pyrethroids and carbamates represents an environmental risk and may exert adverse effects on beneficial microorganisms such as <span class="elsevierStyleItalic">Trichoderma</span>&#44; which contribute to the biocontrol of several fungal phytopathogens&#46; This research evaluated the tolerance of several strains of <span class="elsevierStyleItalic">Trichoderma</span> to a selected culture medium contaminated with a commercial insecticide &#40;H24&#174;&#41; composed of pyrethroids&#44; permethrin and prallethrin&#44; and carbamate propoxur&#44; and determined the influence of this insecticide on the release of enzymes such as chitinases&#44; peroxidases&#44; and endoglucanases by a consortium of selected <span class="elsevierStyleItalic">Trichoderma</span> strains grown in liquid culture medium&#46; Four out of 10 <span class="elsevierStyleItalic">Trichoderma</span> strains showed tolerance to 200<span class="elsevierStyleHsp" style=""></span>ppm &#40;&#8764;48&#46;3&#37; of growth&#41; of the commercial insecticide after 96<span class="elsevierStyleHsp" style=""></span>h of exposure to a contaminated solid medium&#46; After eight days of growth in liquid culture&#44; the insecticide enhanced extracellular protein content and peroxidase activities in the <span class="elsevierStyleItalic">Trichoderma</span> consortium but decreased both chitinase and glucanase activities&#46; These fungal responses should be considered when implementing strategies that combine alternative pesticides and fungal biocontrollers for managing fungal phytopathogens&#46;</p></span>"
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      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span id="abst0015" class="elsevierStyleSection elsevierViewall"><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">La aplicaci&#243;n de piretroides y carbamatos representa un riesgo ambiental y puede ejercer efectos adversos sobre microorganismos ben&#233;ficos&#44; como el <span class="elsevierStyleItalic">Trichoderma</span>&#44; que contribuyen al biocontrol de varios fitopat&#243;genos&#46; Por un lado&#44; esta investigaci&#243;n evalu&#243; la tolerancia de varias cepas de <span class="elsevierStyleItalic">Trichoderma</span> a un medio de cultivo s&#243;lido contaminado con un insecticida comercial &#40;H24&#174;&#41; compuesto por piretroides &#40;permetrina y praletrina&#41; y carbamato propoxur&#59; por el otro&#44; determin&#243; la influencia de este insecticida en la liberaci&#243;n de enzimas como quitinasas&#44; peroxidasas y endoglucanasas por un consorcio de cepas seleccionadas de <span class="elsevierStyleItalic">Trichoderma</span> cultivadas en medio l&#237;quido&#46; Cuatro de 10 cepas de <span class="elsevierStyleItalic">Trichoderma</span> mostraron tolerancia a 200 ppm &#40;&#8764;48&#44;3&#37; de crecimiento&#41; del insecticida comercial despu&#233;s de 96 horas en un medio s&#243;lido contaminado&#46; Tras ocho d&#237;as de crecimiento en cultivo l&#237;quido&#44; el insecticida aument&#243; el contenido de prote&#237;nas y la actividad peroxidasa del consorcio <span class="elsevierStyleItalic">Trichoderma</span>&#44; pero redujo las actividades quitinasa y glucanasa&#46; Estas respuestas f&#250;ngicas podr&#237;an ser consideradas al implementar estrategias para el biocontrol y el manejo de hongos fitopat&#243;genos&#46;</p></span>"
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Growth rate of <span class="elsevierStyleItalic">Trichoderma</span> strains and <span class="elsevierStyleItalic">Phanerochaete chrysosporium</span>-ATCC 34540 in solid medium &#40;PDA&#41; with &#40;a&#41; 0<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#44; &#40;b&#41; 50<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#44; &#40;c&#41; 100<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#44; &#40;d&#41; 150<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#44; and &#40;e&#41; 200<span class="elsevierStyleHsp" style=""></span>mg&#47;l of commercial insecticide H24&#174; with three active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41;&#46; Means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#41;&#46;</p>"
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          "en" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">&#40;a&#41; Radial growth rate &#40;mm&#47;h&#41; and &#40;b&#41; radial growth rate inhibition &#40;RGRI&#37;&#41; of <span class="elsevierStyleItalic">Trichoderma</span> strains and <span class="elsevierStyleItalic">Phanerochaete chrysosporium</span>-ATCC34540 in solid medium &#40;PDA&#41; with 0&#44; 50&#44; 100&#44; 150&#44; and 200<span class="elsevierStyleHsp" style=""></span>mg&#47;l of commercial insecticide H24&#174; with three active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41;&#46; Means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#41;&#46;</p>"
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          "en" => "<p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">&#40;a&#41; Biomass &#40;DW<span class="elsevierStyleHsp" style=""></span>g&#41;&#44; &#40;b&#41; extracellular protein content &#40;&#956;g&#47;l&#41;&#44; and &#40;c&#41; extracellular peroxidase activity &#40;POX activity&#44; U&#47;&#956;g protein&#41; of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 in liquid culture in the absence &#40;SC&#41; and presence &#40;SC<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>I&#41; of sub-ID<span class="elsevierStyleInf">50</span> &#40;100<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41; of commercial insecticide H24&#174; with three active ingredients &#40;permethrin&#44; prallethrin and propoxur&#41;&#44; after 8 days in liquid culture&#46; Different letters indicate significant differences among means for medium culture&#59; asterisks indicate significant differences among means for microorganisms &#40;Tukey&#44; <span class="elsevierStyleItalic">&#945;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41;&#46; Means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#41;&#46;</p>"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">&#40;a&#41; Chitinase activity &#40;GlcNAc&#44; U&#47;mg protein&#41; and &#40;b&#41; endoglucanase activity &#40;CMCase&#44; U&#47;&#956;g protein&#41; of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; and <span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540 in liquid culture in the absence &#40;SC&#41; and presence &#40;SC<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>I&#41; of sub-ID<span class="elsevierStyleInf">50</span> &#40;100<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#41; of commercial insecticide H24&#174; with three active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41;&#44; after 8 days in liquid culture&#46; Different letters indicate significant differences among means for medium culture&#59; the asterisk indicates significant differences among means for microorganisms &#40;Tukey&#44; <span class="elsevierStyleItalic">&#945;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41;&#46; Means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#41;&#46;</p>"
        ]
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          "leyenda" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Active ingredients in the commercial product &#40;H24&#174;&#41; are permethrin&#44; prallethrin&#44; and propoxur&#46; Means<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard error &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#41;&#46;</p>"
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                  <table border="0" frame="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Fungal strain&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">ID<span class="elsevierStyleInf">50</span> &#40;mg&#47;l&#41; of commercial insecticide&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP01&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">104&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;47&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP03&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">131&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>15&#46;80&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP04&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">107&#46;66<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;56&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP022&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">143&#46;76<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP023&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">77&#46;27<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;99&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP037&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">219&#46;04<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;16&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP038&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">91&#46;59<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP056&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">87&#46;32<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;58&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP0X&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">167&#46;10<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;82&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Trich CP0TGC&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">85&#46;58<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;32&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">P&#46; chrysosporium</span>-ATCC 34540&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">134&#46;61<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;34&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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              ]
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                0 => "xTab3489002.png"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Inhibitory dose 50 &#40;ID<span class="elsevierStyleInf">50</span>&#41; of commercial insecticide H24&#174; with three active ingredients &#40;permethrin&#44; prallethrin&#44; and propoxur&#41; on the growth rate of ten strains of <span class="elsevierStyleItalic">Trichoderma</span> sp&#46; and <span class="elsevierStyleItalic">Phanerochaete chrysosporium</span>-ATCC 34540 grown on solid culture medium&#46;</p>"
        ]
      ]
    ]
    "bibliografia" => array:2 [
      "titulo" => "References"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0015"
          "bibliografiaReferencia" => array:50 [
            0 => array:3 [
              "identificador" => "bib0255"
              "etiqueta" => "1"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "A study on biodegradation of propoxur by bacteria isolated from municipal solid waste"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => "J&#46; Anusha"
                            1 => "P&#46;K&#46; Kavitha"
                            2 => "C&#46;G&#46; Louella"
                            3 => "D&#46;M&#46; Chetan"
                            4 => "C&#46;V&#46; Rao"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.9735/0975-2943.1.2.26-31"
                      "Revista" => array:5 [
                        "tituloSerie" => "Int J Biotechnol Appl"
                        "fecha" => "2009"
                        "volumen" => "1"
                        "paginaInicial" => "26"
                        "paginaFinal" => "31"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "bib0260"
              "etiqueta" => "2"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Tolerance and growth of 11 <span class="elsevierStyleItalic">Trichoderma</span> strains to crude oil&#44; naphthalene&#44; phenanthrene and benzo&#91;a&#93;pyrene"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => "R&#46; Argumedo-Delira"
                            1 => "A&#46; Alarc&#243;n"
                            2 => "R&#46; Ferrera-Cerrato"
                            3 => "J&#46;J&#46; Almaraz"
                            4 => "J&#46;J&#46; Pe&#241;a-Cabriales"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1016/j.jenvman.2010.08.011"
                      "Revista" => array:6 [
                        "tituloSerie" => "J&#46; Environ&#46; Manage&#46;"
                        "fecha" => "2012"
                        "volumen" => "95"
                        "paginaInicial" => "S291"
                        "paginaFinal" => "S299"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/20869805"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            2 => array:3 [
              "identificador" => "bib0265"
              "etiqueta" => "3"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Cellulases and related enzymes in biotechnology"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:1 [
                            0 => "M&#46;K&#46; Bhat"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1016/S0734-9750(00)00041-0"
                      "Revista" => array:6 [
                        "tituloSerie" => "Biotechnol&#46; Adv&#46;"
                        "fecha" => "2000"
                        "volumen" => "18"
                        "paginaInicial" => "355"
                        "paginaFinal" => "383"
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ISSN: 03257541
Original language: English
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es en pt

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