The Stability of Antibiotics in Soils

Jefferys, E. G.

doi:10.1099/00221287-7-3-4-295

Cited by 79 publications

(25 citation statements)

References 11 publications

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“…It has been concluded that although soil colloids adsorb antibiotics, they may not be totally inactivated and the adsorption can be reversible [31][32][33][34]. Soil conditions can also affect the amount of streptomycin that is bound, for example, particulate matter can bind more streptomycin under acid conditions [35]. For the type of sop used in our experiments the results support the conclusion that streptomycin can be active in soil.…”

Section: Salmonella Sensitivity To Streptomycin In Soilsupporting

confidence: 83%

The effect ofStreptomycesspecies on the survival ofSalmonellain soil

Turpin

Dhir

Maycroft

et al. 1992

FEMS Microbiology Letters

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A modified Chelex 100 ion‐exchange extraction method was used to monitor streptomycete spores, streptomycete mycelia and Salmonella in soil. Salmonella dusseldorf in soil was inhibited by the bactericidal effect of streptomycin and by the growth of Streptomyces bikiniensis. The soil used in the experiments exerted an antimicrobial effect on S. dusseldorf. Competition between S. dusseldorf, Streptomyces lividans TK24 and Stm. bikiniensis ATCC 11062 was monitored in soil. In sterile amended soil Stm. lividans increased the survival of S. dusseldorf, whereas survival was reduced in the presence of the known streptomycin producer, Stm. bikiniensis. In the presence of S. dusseldorf the production of spores and mycelia by Stm. bikiniensis was reduced, and Stm. lividans sporulation was reduced but mycelia production increased. Evidence was seen for a beneficial effect between S. dusseldorf and Stm. lividans mycelia. In non‐sterile unamended soil the survival of S. dusseldorf was increased in the presence of Stm. lividans, whereas Stm. bikiniensis had no effect. Stm. lividans and Stm. bikiniensis reduced the survival of S. dusseldorf in non‐sterile amended soil, with the most dramatic reduction caused by Stm. bikiniensis. No such changes in the survival of S. dusseldorf were observed with non‐sterile amended soil that had been treated with sludge. The presence of sludge in unamended soil increased the rate of Salmonella die‐off. In unamended soil containing sludge the presence of Stm. lividans increased the survival of S. dusseldorf, whereas survival was reduced in the presence of Stm. bikiniensis. The data provided evidence of antibiosis in soil, relating to the possible production of streptomycin by Stm. bikiniensis.

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Section: Salmonella Sensitivity To Streptomycin In Soilsupporting

confidence: 83%

The effect ofStreptomycesspecies on the survival ofSalmonellain soil

Turpin

Dhir

Maycroft

et al. 1992

FEMS Microbiology Letters

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“…Mineral adsorption of streptomycin was found to be enhanced as pH declined from neutral to acidic conditions, thereby affecting its antibiotic activity [86]. This issue, however, can be resolved by adjusting antibiotic doses applied to individual soils.…”

Section: Methodological Considerationsmentioning

confidence: 99%

Soil Moisture and pH Control Relative Contributions of Fungi and Bacteria to N2O Production

2014

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Fungal N(2)O production has been progressively recognized, but its controlling factors remain unclear. This study examined the impacts of soil moisture and pH on fungal and bacterial N(2)O production in two ecosystems, conventional farming and plantation forestry. Four treatments, antibiotic-free soil and soil amended with streptomycin, cycloheximide, or both were used to determine N(2)O production of fungi versus bacteria. Soil moisture and pH effects were assessed under 65-90 % water-filled pore space (WFPS) and pH 4.0-9.0, respectively. Irrespective of antibiotic treatments, soil N(2)O fluxes peaked at 85-90 % WFPS and pH 7.0 or 8.0, indicating that both fungi and bacteria preferred more anoxic and neutral or slightly alkaline conditions in producing N(2)O. However, compared with bacteria, fungi contributed more to N(2)O production under sub-anoxic and acidic conditions. Real-time polymerase chain reaction of 16S, ITS rDNA, and denitrifying genes for quantifications of bacteria, fungi, and denitrifying bacteria, respectively, showed that fungi were more abundant at acidic pH, whereas total and denitrifying bacteria favored neutral conditions. Such variations in the abundance appeared to be related to the pH effects on the relative fungal and bacterial contribution to N(2)O production.

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“…A well-known source of microbial degradation activities is soil. Biological degradation of mycotoxins griseofulvin, mycophenolic acid and patulin in soil has been reported as early as in 1952 (Jefferys, 1952); however, active mixed cultures from soil often lose activity after separation into pure cultures, as reported for zearalenone (Megharaj et al, 1997) and DON (He et al, 1992;Binder et al, 1997a).…”

Section: Search For Mycotoxin-transforming Microorganisms: General Comentioning

confidence: 99%