Sensitivity to Urea Fertilization in Three Amphibian Species
نویسندگان
چکیده
منابع مشابه
Sensitivity to urea fertilization in three amphibian species.
Forest fertilization with granular urea is a well-established management practice in many forested regions of the world. We hypothesize that chemical forest fertilizers may be affecting forest-dwelling wildlife. In the laboratory, we studied the effects of fertilization doses of granular urea on three species of forest-dwelling amphibians (Plethodon vehiculum, Rhyacotriton variegatus, and Taric...
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OBJECTIVE Urea is commonly used as a keratolytic substance in the treatment of onychomycoses to improve the penetration of antifungal drugs in the lesion sites. The aim of the present study was to investigate the inhibitory action of urea on samples of dermatophytes in vitro. METHOD Minimum inhibitory concentration of urea was determined for 31 samples of dermatophytes cultured in Sabouraud-d...
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Embryos of three aquatic breeding amphibian species, Ambystoma mexicanum, Hyla chrysoscelis, and Rana clamitans, were exposed to increasing levels (0, 5, 10, 30, 60, 100, 300, and 500 mg/L) of nitrate-N (NO(3)-) in laboratory, static-renewal experiments. Lethal effects were recorded from Gosner stage 2 (H. chrysoscelis and R. clamitans) or Harrison stage 2 (A. mexicanum) to time of hatching. Da...
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The biosynthesis of urea in vifro was maintained at a constant rate for 48 hours in a surviving amphibian liver cube system. The maintenance of constant oxygen consumption and protein synthesis during this time indicated that the majority of cells remained viable. A direct correlation between the rate of lixation of 14C02 and ammonia into urea and the levels of carbamyl phosphate synthetase in ...
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ژورنال
عنوان ژورنال: Archives of Environmental Contamination and Toxicology
سال: 2001
ISSN: 0090-4341,1432-0703
DOI: 10.1007/s002440010190