Results 141 to 150 of about 72,965 (197)
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2001
Considered to be an effective antioxidant, beta-carotene, a carotenoid that occurs naturally in many vegetables and fruits and that converts to vitamin A in the body, has been the subject of intensive cancer prevention research for decades,1; and is a commonly found supplement on the shelves of most supermarkets.
P, Greenwald, S S, McDonald
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Considered to be an effective antioxidant, beta-carotene, a carotenoid that occurs naturally in many vegetables and fruits and that converts to vitamin A in the body, has been the subject of intensive cancer prevention research for decades,1; and is a commonly found supplement on the shelves of most supermarkets.
P, Greenwald, S S, McDonald
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Toxicology, 1985
The safety of beta-carotene, a widely distributed food colorant was assessed in tests with cells and in sub-chronic and chronic experiments with animals. Mutagenicity evaluations which included the standard Ames test and the micro-nucleus test of bone marrow cells from mice showed that beta-carotene exerted no mutagenic properties.
R, Heywood +3 more
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The safety of beta-carotene, a widely distributed food colorant was assessed in tests with cells and in sub-chronic and chronic experiments with animals. Mutagenicity evaluations which included the standard Ames test and the micro-nucleus test of bone marrow cells from mice showed that beta-carotene exerted no mutagenic properties.
R, Heywood +3 more
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Beta‐Carotene in HIV Infectiona
Annals of the New York Academy of Sciences, 1993beta-Carotene has been reported to have an immunostimulatory effect. Recent studies suggest that beta-carotene supplementation can increase CD4 counts in HIV-infected patients. Our double-blind, placebo-controlled clinical trial was designed to test the efficacy of beta-carotene in raising CD4 counts in HIV-infected patients.
G O, Coodley +3 more
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Beta-Carotene: Thermal Degradation
Science, 1964Thermal treatment of crystalline β-carotene (240°C in a vacuum) results in the formation of a volatile fraction containing chiefly aromatic hydrocarbons such as toluene, m - and p -xylene, 2,6-dimethylnaphthalene, and ionene.
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European journal of clinical nutrition, 1996
Beta-carotene has been shown to exhibit a good radical-trapping antioxidant activity in vitro. We were interested to see if dietary beta-carotene in combination with various intake levels for vitamin A would also inhibit lipid peroxidation.Sixty male Wistar rats received vitamin A (as retinyl palmitate) for 14 weeks in the diet (40,000, 4000 and 400 IU/
Bast, A. +3 more
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Beta-carotene has been shown to exhibit a good radical-trapping antioxidant activity in vitro. We were interested to see if dietary beta-carotene in combination with various intake levels for vitamin A would also inhibit lipid peroxidation.Sixty male Wistar rats received vitamin A (as retinyl palmitate) for 14 weeks in the diet (40,000, 4000 and 400 IU/
Bast, A. +3 more
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Beta Carotene in Congenital Porphyria
Archives of Dermatology, 1979To the Editor.— In answer to Dr G. S. Stretcher's request for information on the use of beta carotene in congenital porphyria (Archives114:1242-1243, 1978), I would like to bring to his attention two reports of the use of beta carotene in this disease.
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Serum beta-carotene before and after beta-carotene supplementation.
European journal of clinical nutrition, 1992A two-month double-blind, placebo-controlled supplementation study of oral beta-carotene (20 mg daily) was conducted. Two hundred and twenty two 30-69 year old men were randomized into either a beta-carotene or placebo group, and serum samples were obtained at baseline, follow-up (2 months), and up to 12 weeks post-supplementation.
D, Albanes +6 more
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Beta Carotene in Congenital Porphyria
Archives of Dermatology, 1978To the Editor.— Dr George Stretcher, in his article on erythropoietic porphyria, which appeared in the NovemberArchives(113:1553-1557,1977), makes a reference to the lack of information about the long-term treatment with beta carotene. In 1973,I described a young woman, aged 18, with congenital porphyria at the Royal Society of Medicine ( Proc R Soc ...
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