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Sida 1 från 36 resultat
Control of nitrate and nitrite assimilation by carbohydrate reserves, adenosine nucleotides and pyridine nucleotides in leaves of Zea mays L. under dark conditions.
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The rate of in-vivo nitrate reduction by leaf segments of Zea mays L. was found to decline during the second hour of dark anaerobic treatment. On transfer to oxygen the capacity to reduce nitrate under dark conditions was restored. These observations led to the proposal that nitrate reductase is a
Effect of alpha-naphthyl isothiocyanate on 2-amino-3-methylimidazo[4,5-b]pyridine (PhIP)-induced mammary carcinogenesis in rats.
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The modifying effects of alpha-naphthyl isothiocyanate (ANIT) on 2-amino-3-methylimidazo[4,5-b]pyridine (PhIP)-induced mammary carcinogenesis were investigated in female Sprague-Dawley (SD) rats, and the hepatic activities of the phase II detoxifying enzymes glutathione S-transferase (GST) and
2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) retards mammary gland involution in lactating Sprague-Dawley rats.
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2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP), a compound from cooked meat, is an established mammary gland carcinogen in female rats. Four doses of PhIP (150 mg/kg, p.o., once per day) were given to lactating Sprague-Dawley rats separated from their 10-day-old pups to initiate involution
Dietary omega-3 fatty acids as potential inhibitors of carcinogenesis: effect on DNA adduct formation of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in mice and rats.
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The heterocyclic amine 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is carcinogenic in the CDF1 mouse, causing lymphomas (spleen and lymph nodes) and in the F344 rat, causing mammary tumours in the female and colon tumours in the male. Dietary fish oil, a rich source of omega-3 fatty
Proliferation, development and DNA adduct levels in the mammary gland of rats given 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine and a high fat diet.
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2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is a heterocyclic amine derived from cooked meat that is a mammary gland carcinogen in rats. A carcinogenic dose-regimen of PhIP (75 mg/kg, p.o., 10 doses, once per day) was administered to 43-day old female Sprague-Dawley rats, and the rats
An electron transport system in maize roots for reactions of glutamate synthase and nitrite reductase : physiological and immunochemical properties of the electron carrier and pyridine nucleotide reductase.
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A non-heme iron containing protein which bears an antigenic similarity to ferredoxin from spinach leaves (Spinacia oleracea L.) has been identified in extracts prepared from young roots of maize (Zea mays L., hybrid W64A x W182E). The ferredoxin-like root electron carrier could substitute for
The effect of dose and enzyme inducers on the metabolism of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in rats.
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Male Fischer 344 rats were given a single dose of 0.03-30 mg/kg of [2-14C]2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine ([14C]PhIP), the radioactivity in urine and feces was determined over 48 h, and the major metabolites were identified and quantified. Dose had little effect on the profile of
The role of fat and calcium in the production of foci of aberrant crypts in the colon of rats fed 2-amino-1-methyl-6-phenylimidazo[4,5-b]-pyridine.
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The modulation by dietary fat levels of intestine carcinogenesis is well documented. New developments suggest that calcium ions may also play a role. A rapid bioassay, the induction of foci of aberrant crypts in the colon, was used to explore the interaction between dietary fat and calcium. Male
The effects of 1-nitropyrene, 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine and 7,12-dimethylbenz[a]anthracene on 8-hydroxy-2'-deoxyguanosine levels in the rat mammary gland and modulation by dietary 1,4-phenylenebis(methylene) selenocyanate.
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Humans are exposed to 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and 1-nitropyrene (1-NP) via several environmental sources and both are known mammary carcinogens in rodents, with the former being more potent (K. El-Bayoumy, Y.-H. Chae, P. Upadhyaya, A. Rivenson, K. Kurtzke, B. Reddy,
Lack of inhibitory effect of benzyl isothiocyanate on 2-amino-1-methyl-6-phenylimidazo [4,5-b]pyridine (PhIP)-induced mammary carcinogenesis in rats.
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Modifying effects of benzyl isothiocyanate (BITC), a glucosinolate compound, were investigated on 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)-induced mammary carcinogenesis in female SD rats. One hundred twenty five female rats were divided into 4 groups. Starting at 6 weeks of age, rats
Chemoprevention of 2-amino-1-methyl-6-phenylimidazo [4,5-b]pyridine-induced mammary carcinogenesis in rats.
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Modifying effects of dietary exposure of diallyl disulfide (DAD), aspirin, DL-alpha-difluoromethylomithine (DFMO), beta-naphthoflavone (beta-NF), alpha-naphthoflavone (alpha-NF), indole-3-carbinol (I3C) and protocatechuic acid (PCA) on 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)-induced
mRNA differential display of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine-induced rat mammary gland tumors.
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The mRNA differential display technique was used to compare mRNAs between normal mammary gland and tumor-derived epithelial cells from female Sprague-Dawley rat mammary gland tumors induced by the heterocyclic amine 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and promoted by a high-fat
Characterization of peroxisome proliferator-activated receptor alpha in normal rat mammary gland and 2-amino-l-methyl-6-phenylimidazo[4, 5-b]pyridine-induced mammary gland tumors from rats fed high and low fat diets.
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Normal Sprague-Dawley rat mammary gland epithelial cells and mammary gland carcinomas induced by 2-amino-1-methyl-6-phenylimidazo[4, 5-b]pyridine, a carcinogen found in the diet, were examined for the expression of peroxisome proliferator-activated receptor alpha (PPAR alpha). PPAR alpha mRNA and
Identification, characterization, and partial purification of 4 alpha-carboxysterol-C3-dehydrogenase/ C4-decarboxylase from Zea mays.
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A microsomal preparation from seedlings of Zea mays catalyzed the NAD+-dependent oxidative decarboxylation of several substrates, including 4alpha-carboxy-cholest-7-en-3beta-ol, synthesized according to a new procedure, giving the first in vitro evidence for this enzymatic activity in a higher
Inhibitory effects of diallyl disulfide or aspirin on 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine-induced mammary carcinogenesis in rats.
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Modifying effects of diallyl disulfide (DAD), aspirin or DL-alpha-difluoromethylornithine (DFMO) on 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)-induced mammary carcinogenesis in SD rats were investigated. A total of 166 female rats, 6 weeks old, were divided into 8 groups. They were fed a
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