Results 201 to 210 of about 39,032 (244)
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Chlorosilane Acute Inhalation Toxicity and Development of an LC50 Prediction Model
Inhalation Toxicology, 2006The acute inhalation toxicity of 10 chlorosilanes was investigated in Fischer 344 rats using a 1-h whole-body vapor inhalation exposure and a 14-day recovery period. The median lethal concentration (LC50(1)) for each material was calculated from the nominal exposure concentrations and mortality.
Paul A, Jean +5 more
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Methods for Calculating an LC50
1977A variety of graphical and computational methods can be used to derive a median lethal concentration (LC50) from concentration-mortality data produced by an acute mortality test. In the selection of a method, practical considerations should receive as much attention as the usual theoretical and statistical considerations.
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Measuring cytotoxicity: a new perspective on LC50.
Anticancer research, 2007Cytotoxicity in cell culture is typically expressed as LC50 the concentration of a given agent which is lethal to 50% of the cells. This number is dependent on the incubation time with the agent. Previously, a two-term exponential model has been proposed to describe cell growth after a cytotoxic event: y(t) = k, * exp(-d(1)*t) + k2 * exp(d(2)*t).
Ming, Zhang +6 more
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Dependence between LD50 for Rodents and LC50 for Adult Fish and Fish Embryos
Bulletin of Experimental Biology and Medicine, 2017We revealed empirical dependences between common logarithm of a ratio of rat oral LD50 to LCa50 for adult fish and lgP for 50 different chemicals; and common logarithm of a ratio of the oral LD50 in rodents to LCe50 for fish embryos and lgP for 30 different chemicals.
K V, Zolotarev +3 more
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The utility of computed superdelocalizability for predicting the LC50 values of epoxides to guppies
Science of The Total Environment, 1991A quantitative structure-activity relationship (QSAR) was found for predicting the pseudo-first-order reaction rate constant of the alkylating chemical 4-nitrobenzylpyridine with a set of epoxides. The superdelocalizability of the unoccupied levels of the orbital along the carbon-oxygen bond of the least substituted carbon was found to be an excellent ...
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LC50 of lambda-cyhalothrin stimulates reproduction on the moth Mythimna separata (Walker)
Pesticide Biochemistry and Physiology, 2019Lambda-cyhalothrin has long been recommended as an effective insecticide to control the oriental armyworm, Mythimna separata (Walker), a notorious migratory pest of agricultural plants. Previous researches have suggested that survival, development, and reproduction of insects are influenced by sublethal concentrations of insecticides.
Xin-Ru Li +5 more
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Standard error of lc50 and sample size in fish bioassays
Water Research, 1972Abstract The relationship between the relative error and sample size in fish bioassays was investigated empirically and theoretically. It was shown that if the mean concentration tested is near the estimated lc 50 and the same sample size is used at each test level, the dependence of relative error on sample size is predictable.
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Acute Toxicity and LC50 Values of Chlorpyrifos on Eudrilus eugeniae
BIOINFOLET - A Quarterly Journal of Life SciencesAbstractPresent study evaluates acute toxic effects of chlorpyrifos on earthworm ( Eudrilus eugeniae ) under laboratory conditions. Acute toxicity bioassays was performed following OECD ( 1984) guideline 207 using artificial soil. The LC50 values were determined after 7 and 14 days of exposure.
P. A. Suryawanshi, D. S. Patil
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Acute toxicity and LC50 determination of roundup on Eudrilus eugeniae
BIOINFOLET - A Quarterly Journal of Life SciencesAbstractPresent study was undertaken to assess effect of Roundup on earthworm, Eudrilus eugeniae. The values for LC50 were determined over 7 and 14 day exposure periods. Earthworms were exposed to concentrations ranging from 0.01 to 1000 ppm in artificial soil.
D. S. Patil, P. A. Suryawanshi
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LC50 Value of Paraquat (24%) in Drosophila Melanogaster Larvae
BIOINFOLET - A Quarterly Journal of Life SciencesAbstractThe objective of present investigation was to determine the Lethal Concentration 50 (LC50) of commercially available paraquat. a herbicide, at 24 % dilution with second instar larvae of Drosophila melanogaster. For this purpose the second instar larvae, were exposed to different concentrations of paraquat (20, 22, 24, 26 and 28 µl/ml ...
Girima Nagda, Chhavi Bhalothia
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