Results 211 to 220 of about 235,288 (260)

Fishing for Toxic Chemicals

Science, 1999
AAAS MEETING: BIOENGINEERINGAt the annual meeting of the American Association for the Advancement of Science (AAAS, which publishes Science ) held on 21 to 26 January in Anaheim, California, toxicologists described a promising new line of fish that could be used for screening toxic chemicals. If the work pans out, the fish could make toxicology testing
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The Effect of Nutrition on Chemical Toxicity

Drug Metabolism and Drug Interactions, 1997
The toxicity of chemicals, and of reactive oxygen species (ROS), are both affected by nutrition and diet. Calorific excess (continuous feeding), or deficiency (fasting), may increase production of ROS, which are also formed by interaction of toxic chemicals with cytochromes P450 (CYP2E or futile cycling).
D V, Parke, M S, Dhami, M, Afzal
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Chemical Toxicity on HeLa Cells

Current Medicinal Chemistry, 2006
HeLa cells were named for Henrietta Lacks, who died in 1952 from an infection of a special type of cancer. Margaret Gey, her physician, started working with these cancer cells that are still used for medical research. In the present review, an attempt has been made to collect the data for the effects of different chemicals on HeLa cells and to discuss ...
Rajeshwar P, Verma, Corwin, Hansch
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Toxic Chemicals in Food

Journal of the Forensic Science Society, 1976
The various classes of toxic chemicals that may be present in food namely environmental contaminants, natural toxins, pesticide residues, food additives and contaminants, are reviewed. It is emphasized that the real hazards from toxic chemicals in food are the result of gross contamination, deliberate or accidental, and a number of such incidents are ...
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ACUTE CHEMICAL TOXICITY OF URANIUM

Health Physics, 2008
Although human experience with uranium spans more than 200 years, the LD50 for acute intake in humans has not been well established. Large acute doses of uranium can produce death from chemical toxicity in rats, guinea pigs, and other small experimental animals, with variation in sensitivity among species.
Ronald L, Kathren, Richard K, Burklin
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How Toxic Are Toxic Chemicals in Soil?

Environmental Science & Technology, 1995
Assessments of the hazard of toxic chemicals in soil are made without concern about the possibility that their bioavailability may change with time. The patterns of disappearance of persistent compounds in the field and laboratory studies show a declining availability to microorganisms with residence time in soil.
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Oxidative stress in chemical toxicity

Archives of Toxicology, 1987
The toxic effects of compounds which undergo redox cycling via enzymatic one-electron reduction are reviewed. First of all, the enzymatic reduction of these compounds leads to reactive intermediates, mainly radicals which react with oxygen, whereby superoxide anion radicals are formed.
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Chemical Screening and Toxicity Testing

Cold Spring Harbor Protocols, 2022
The chemical space is vast, encompassing potentially billions of natural and synthetic molecules, which are for the most part uncharted with regard to their pharmaceutical, therapeutic, or toxicological potential. Determining the biological efficacy or harm of these chemicals presents both an enormous opportunity and a challenge to society.
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COMPARATIVE TOXICITY OF CHEMICALS TO EARTHWORMS

Environmental Toxicology and Chemistry, 1994
Abstract The concentration-response (mortality) relationships of four species of earthworms, Eisenia fetida (Savigny), Allo lobophora tuberculata (Eisen), Eudrilus eugemae (Kinberg), and Perionyx excavatus (Perrier) are summarized for 62 chemi cals and two test protocols A Weibull function is used to summarize these data for each ...
C A Callahan, M A Skirazi, E F Neuhauser
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On The Role of Calcium in Chemical Toxicity

1987
It is now well established that the toxic effects of a variety of chemicals are me­diated by reactive products formed during their biotransformation in the organ­ism. It is equally clear that there exist protective systems which can trap or inac­tivate toxic metabolites and thereby prevent their accumulation within the tissues and subsequent toxicity ...
S, Orrenius, P, Nicotera
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