Interactions of Certain Polyacrylamides With Soil Bacteria

Grula, Mary M.; Huang, May-Lin; Sewell, Guy W.

doi:10.1097/00010694-199410000-00009

Cited by 48 publications

(28 citation statements)

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“…Bacterial enrichment cultures, derived from PAM-treated field soils, were capable of growth with PAM as a sole N source but not sole C source, whereas AMD served as either a sole N or C source for bacterial growth (Kay-Shoemake et al, 1998b). Work by Grula et al (1994) showed that PAMs are an N source for bacteria and stimulate the growth of a number of Pseudomonas sp. ; only cationic formulations were toxic to the organisms they cultured using PAM concentrations under 0.2%.…”

Section: Pam Effect On Organisms In Runoff and Soilmentioning

confidence: 99%

Polyacrylamide in Agriculture and Environmental Land Management

Sojka

Bjorneberg

Entry

et al. 2007

Advances in Agronomy

355

240

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Section: Pam Effect On Organisms In Runoff and Soilmentioning

confidence: 99%

Polyacrylamide in Agriculture and Environmental Land Management

Sojka

Bjorneberg

Entry

et al. 2007

Advances in Agronomy

355

240

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“…Results using these synthetic polymers at low rates have generally demonstrated beneficial effects on soil structure and aggregation. However, the positive effects have been shown to be transient, because the polymers are prone to microbial degradation in the soil (Grula et al, 1994). To avoid this, frequent reapplications are required, which are labour-intensive and costly.…”

Section: Introductionmentioning

confidence: 99%

Effects of potassium humate on aggregate stability of two soils from Victoria, Australia

Imbufe

Patti

Burrow³

et al. 2005

Geoderma

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“…Amidase activity has also been implicated in the degradation of amide-containing pesticides in culture and soil (Bollag and Liu, 1990). Grula et al (1994) reported that certain Pseudomonas sp. were able to utilize a type of PAM as a N source and that transient amidase activity was associated with growth of those cultures.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylamide as a substrate for microbial amidase in culture and soil

Kay-Shoemake¹,

Watwood²,

Sojka³

et al. 1998

Soil Biology and Biochemistry

102

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Summary-High molecular weight, linear polyacrylamide (PAM) with anionic charge is added to agricultural soils as an anti-erosion additive. Research indicates that soil microorganisms are able to utilize PAM as a source of N and that inorganic N pools are altered in some PAM-treated soils. The potential role of hydrdlytic amidase activity in the microbial utilization of PAM for N was investigated. Intracellular and extracellular amidase activity was measured over time in enrichment cultures which used PAM as sole N source. Enzyme activity increased concomitant with cell growth and N removal from PAM. Cell growth, N removal and amidase production were dependent upon readily-available C in the medium. Amidase activity and substrate specificity were determined for PAM-utilizing enrichment cultures exposed to various N sources. Polyacrylamide-specific amidase activity appears to be inducible, and not constitutive, based on the lack of amidase activity in cultures supplied with only ammonium nitrate for N versus substantial activity when PAM was added as an amendment with or without ammonium nitrate. Cultures amended with propionamide exhibited amidase activity largely specific for this small amide substrate, while cultures supplied with PAM as sole N source exhibited amidase activity specific for formamide, propionamide and PAM. Amidase activity and substrate specificity were determined for PAM-treated and untreated agricultural field soils. Polyacrylamide-specific amidase activity was higher in PAM-treated soil (14.86 ± 14.0 pg NH4 released soil) than in untreated soil (1.02 ± 2.3 pg NH4 released C I soil); activity specific for low molecular weight amides was slightly elevated or unchanged in PAM-treated soil as compared with untreated soil.

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Interactions of Certain Polyacrylamides With Soil Bacteria

Cited by 48 publications

References 0 publications

Polyacrylamide in Agriculture and Environmental Land Management

Polyacrylamide in Agriculture and Environmental Land Management

Effects of potassium humate on aggregate stability of two soils from Victoria, Australia

Polyacrylamide as a substrate for microbial amidase in culture and soil

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