摘要:

A desmutagenic factor which inhibited the mutagenicity of the mutagens, Trp‐P‐1 (3‐amino‐1,4‐dimethyl‐5H‐pyrido[4,3‐b]indole), Trp‐P‐2 (3‐amino‐1‐methyl)‐5H‐pyrido[4,3‐b]indole), ethidiumbromide and 2‐aminoanthracene, was purified from broccoli (Brassica olerancea var. italica plenck). The factor was not sedimented by ultra‐centrifugation at 200,000 xg for 2 h. It adsorbed to a DEAE‐cellulose column and was eluted with low concentration of potassium chloride. The purified factor exhibited a heme‐like protein absorption spectrum with a Soret band at 403 nm and α and β bands at 640 and 504 nm, respectively. The molecualr weight was estimated to be approx

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1982.tb00438.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

In separate experiments, growing and/or finishing swine were fed a control diet and diets supplemented with various low levels of lead and cadmium, for periods up to 24 weeks. The levels of lead in different treatment groups were 2 (control), 6 and 21 parts per million (ppm), whereas those for cadmium were 0.2 (control), 2.4 and 10.1 ppm, respectively. Lead did not accumulate in skeletal muscles, but a dose‐related increase was observed in bone, liver and kidney. In the case of cadmium, no increase was seen in skeletal muscles, bone or brain; the accumulation occurred primarily in kidney and liver. After cessation of lead supplementation the concentration of this metal declined in liver and kidney tissues. On the other hand, cadmium levels did not show any appreciable decline in kidney or liver during 12 weeks after an initial 12 weeks treatment. Lead and cadmium did not accumulate in edible muscles of swine, but the high concentrations of these metals that were recorded in liver and kidney would render these organs unfit for food purpose

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1982.tb00439.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The three major secondary metabolites of Penicillium viridicatum, brevianamide, xanthomegnin, and viomellein were tested for mutagenicity by the Salmonella/microsome test and for toxicity and teratogenicity by the chick embryo test. None were mutagenic. Viomellein was mildly toxic and teratogenic, xanthomegnin was the most toxic and was not a teratogen, and brevianamide was not toxic yet was the most teratogenic.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1982.tb00440.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Modified Skirrow's (with 15 μg cephalothin/ml), Campy‐BAP, and Butzler's selective agar plates were compared for sensitivity and selectivity in the recovery of inoculated Campylobacter fetus ssp. jejuni from ground beef. The diluted inoculation samples were surface plated directly onto these selective plates and incubated. When colonies on the plates were enumerated, characterized, and identified, Campy‐BAP medium proved to be the most sensitive for recovery, and Butzler's medium the most selective. Contaminants of Pseudomonas and Acinetobacter were observed. A combination of both Campy‐BAP and Butzler's media should prove most useful in the recovery of Campylobacter from food sources. The significance of current taxo‐nomical considerations for food microbiologists are also d

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1982.tb00441.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Aerobic plate counts on Plate Count Agar at 25°C were used to determine the time required to reach a microbial spoilage level of 1.0 × 107C.F.U./g, for mechanically deboned chicken meat, minced fish and chicken sausage stored at 2°C. The storage times were 5, 8 and 9 days, respectively. Addition of citric acid (0.2%), ascorbic acid (0.2%) or lauricidin (250 ppm) alone extended the shelf‐life by 0–2 days. The combination of lauricidin and citric acid or lauricidin and ascorbic acid extended the time required to reach a microbial spoilage level for mechanically deboned chicken meat by as much as 7 days, minced fish by as much 4 days and chicken sausage by

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1982.tb00442.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY