A modified method based on arsenomolybdate complex to quantify cellulase activities: Application to litters

Farnet, Anne‐Marie; Qasemian, Leila; Guiral, Daniel; Ferre, E.

doi:10.1016/j.pedobi.2009.09.001

Cited by 27 publications

(24 citation statements)

References 2 publications

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“…The glucose released was quantified using the Somogyi–Nelson method modified by Farnet et al . (). Tyrosinase activity, based on the oxidation of tyrosine to L‐Dopa ( ε = 3400 L/mol/cm), was performed using a modified method of Saiya‐Cork et al .…”

Section: Methodsmentioning

confidence: 99%

Olive mill waste and glyphosate‐based herbicide addition to olive grove soils: effects on microbial activities and their responses to drying–rewetting cycles

Boukhdoud

Silva

Darwish

et al. 2017

Soil Use and Management

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The objective of this experimental study was to determine the effect of agronomic practices usually implemented in olive groves (addition of olive mill waste and herbicides) on soil microbial communities and to test whether drought enhanced such effects. For that purpose, mesocosms containing soil cores from olive groves were incubated for 5 months under either of the three treatments: (i) addition of olive mill waste (OMW), (ii) addition of glyphosate‐based herbicide (Gly treatment) and (iii) both treatments. Half of the mesocosms were subjected or not (controls) to drying–rewetting cycles (D/Rw) for 1 month (1 D/Rw) or 3 months (3 D/Rw). In the controls, 2 months after the Gly treatment, higher lipase activities were observed compared with no practice treatment as well as a significant change in catabolic profiles of cultivable microbial communities. Three months later, lipase activities significantly decreased under the Gly treatment. Addition of OMW together with Gly treatment counteracted the negative effect of the herbicide on lipase activities. After three D/Rw cycles, Gly treatment modified catabolic profiles and induced a decrease in functional diversity. Overall, the combination of glyphosate‐based herbicide with OMW was a conservative practice that maintained soil functioning and led to a better response to D/Rw cycles.

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Section: Methodsmentioning

confidence: 99%

Olive mill waste and glyphosate‐based herbicide addition to olive grove soils: effects on microbial activities and their responses to drying–rewetting cycles

Boukhdoud

Silva

Darwish

et al. 2017

Soil Use and Management

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“…Cellulase activity was measured with the Somogy‐Nelson method modified by Farnet et al . () with carboxymethyl cellulose as substrate. Urease activity was measured as described by Kandeler & Gerber () based on the determination of NH 4 + after urea hydrolysis.…”

Section: Methodsmentioning

confidence: 99%

“…Tyrosinase activity was based on the oxidation of tyrosine to L-Dopa ( M = 3400 M −1 cm −1 ) following Saiya-Cork et al (2002). Cellulase activity was measured with the Somogy-Nelson method modified by Farnet et al (2010b) with carboxymethyl cellulose as substrate. Urease activity was measured as described by Kandeler & Gerber (1988) based on the determination of NH 4 + after urea hydrolysis.…”

Section: Chemical and Microbial Characterization Of The Soilmentioning

confidence: 99%

Effect of agricultural practices and coastal constraints on soil microbial functional properties in Mediterranean olive orchards

Boukhdoud

Gros

Darwish

et al. 2016

European J Soil Science

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International audienceThis research examines how agricultural practices commonly used in Lebanese olive tree orchards (no-tillage, co-culture with Vicia sativa L. var. sativa and conventional tillage) affect soil microbial and chemical characteristics, and whether this depends on geographical context (coastal or inland areas). Four coastal and four inland sampling sites were selected, and at each site three practices were considered (one practice per plot). For each plot (200m(2)), 20 soil samples were taken and homogenized to obtain a composite sample from which soil was characterized chemically and microbiologically. Differences in chemical properties (smaller N content and alkyl C fraction in the coastal area) depended on geographical location rather than on agricultural practices. For microbial properties, catabolic structure varied with geographical location; the index of catabolic diversity was larger in the coastal area. Importantly, the basal respiration was similar in both areas although the soil contained less nitrogen (N) in the coastal area. The negative effect of conventional tillage on microbial functioning of the soil was observed only in relation to geographical location. We found that this effect was reduced by co-culture, for example with Vicia sativa L. var. sativa. Our study reveals that geographical location affects how agricultural practices affect soil properties (in the coastal area, enhanced mineralization of labile C and change in microbial catabolic profile). This suggests that soil management should take into account the environmental conditions specific to coastal areas, which enhance the adverse effects of conventional tillage. Consequently, this type of management should not be implemented in coastal areas of the Mediterranean

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“…The mechanism involved in arsenate removal by R-Mo may consist of one or a combination of several reactions including electrostatic attraction, precipitation on Mo(VI) ions and/or ion exchange. However, molybdate is known to form several complexes in acidic media with As(V), P(V), Si(V) and Ge(IV) (Farnet et al 2010). So arsenate sorption is likely to occur through the formation of the arsenomolybdate complex with Mo(VI) ions sorbed on R-Mo resin.…”

Section: Adsorption Of As(v) On R-momentioning

confidence: 99%

Removal of arsenate from aqueous media by magnetic chitosan resin immobilized with molybdate oxoanions

Elwakeel

2013

Int. J. Environ. Sci. Technol.

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Chitosan was cross-linked using glutaraldehyde in the presence of magnetite. The resin obtained was chemically modified through the reaction with tetraethylenepentamine ligand. The obtained resin was loaded with Mo(VI) and investigated. The adsorption characteristics of the obtained resin toward As(V) at different experimental conditions were investigated by means of batch and column methods. The resin showed high affinity and fast kinetics for the adsorption of As(V) where an uptake value of 1.30 mmol g -1 was reported in 6 min at 25°C. Various parameters such as pH, agitation time, As(V) concentration and temperature had been studied. The kinetics and thermodynamic behavior of the adsorption reaction were defined. These data indicated an endothermic and spontaneous adsorption process and kinetically followed pseudosecond-order model, Fickian diffusion low and Elovich equation. Breakthrough curves for the removal of As(V) were studied at different flow rates and bed heights. The critical bed height for the studied resin column was found to be 0.656 cm at flow rate of 4 mL min -1 . The mechanism of interaction between As(V) and resin's active sites was discussed. Regeneration and durability of the loaded resin toward the successive cycles were also clarified.

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A modified method based on arsenomolybdate complex to quantify cellulase activities: Application to litters

Cited by 27 publications

References 2 publications

Olive mill waste and glyphosate‐based herbicide addition to olive grove soils: effects on microbial activities and their responses to drying–rewetting cycles

Olive mill waste and glyphosate‐based herbicide addition to olive grove soils: effects on microbial activities and their responses to drying–rewetting cycles

Effect of agricultural practices and coastal constraints on soil microbial functional properties in Mediterranean olive orchards

Removal of arsenate from aqueous media by magnetic chitosan resin immobilized with molybdate oxoanions

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