摘要:

Quercetin and kaempferol were tested for carcinogenicity in rats of both sexes. In Experiment I, 0.1% quercetin or control diet was given to Fischer 344 rats for 540 days. In experiment II, 0.04% kaempferol or control diet was given to ACI rats for 540 days. In both experiments, most tumors found in the experimental groups were also found in the corresponding control groups, and there were no statistical differences in the incidences of tumors in the experimental groups and the respective control groups. Quercetin and kaempferol were not shown to be carcinogenic to rats under these conditions.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00455.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The influence of culture age, pH, aeration, and temperature on Salmonella toxin production was investigated using fermentor cultures containing casamino acids‐yeast extract as a growth medium. About 75% or more of total Salmonella toxin was synthesized and released when the cultures were harvested during stationary phase of growth. Increased production and release of the toxin was also observed when the cultures were regulated at pH 6.0, 7. 0, or under alkaline control. The optimal temperature for the synthesis of Salmonella toxin was at 37°C; increased aeration of the cultures (500 rpm) appeared to enhance Samonella toxin producti

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00456.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Fatty acid profiles of larval nematodes (stage‐ 4 Sulcascaris sp.), of tissue from their intermediate host (calico scallops, Argopecten gibbus), and of the host capsule that surrounds the larvae were prepared in an attempt to identify infected scallops. Nematode tissue showed lower ratios of C14:O/C14:1, C16:0/C16:1and C18:0/C18:1than did scallop tissue. The nematodes contained relatively less C16:0and more C18:2than did scallops. Fatty acids shorter than C14:0were found in small amounts in both organisms. Fatty acid profiles of capsules differed little from those of normal scallop tissu

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00457.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Repeated surveys of a factory producing vegetable sprouts showed that these foods commonly yielded aerobic plate counts of 108/g and coliform counts of 107/g. Most of the microbial growth occurred during the first two days of the germination process. Mung beans germinated in the laboratory in sterilized containers yielded comparable counts indicating that growth of the bean microflora rather than insanitary conditions was responsible. Populations were reduced to a limited extent with germicidal rinses. None of the samples yielded high counts of Bacillus cereus or Staphylococcus aureus and all were negative for salmonellae.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00458.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Factors affecting the immuno‐gel diffusion method for detecting toxigenic (tox+) C. botulinum type A and nontoxigenic (tax‐) C. sporogenes were studied. This procedure was extended to detect types B, E, and F using homologous and poly A‐F antitoxins for proper tox‐types. Increasing glucose levels from 0 to 3% in the growth medium caused larger and more intense precipitin zones around colonies of C. botulinum type A. Precipitin zones were detected in TPGYA that contained no glucose, but better zones occurred at 4% and thereafter up to 7% glucose at pH 7.6. The most favorable titers of C. botulinum antitoxins incorporated either in gel‐diffusion agar (GDA) or in growth medium varied with the C. botulinum type. The method differentiates between C. botulinum types A, B, E, F and C. s

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00459.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00460.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00461.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY