摘要:

Stable auxotrophic mutants were isolated by N‐methyl‐N'‐nitro‐N‐nitrosoguanidine treatment ofMycobacterium fortuitumNIHJ 1615,M. smegmatisNIHJ 1628 andM. vaccaeNIHJ 1637. The number of stable mutants obtained were 0.17, 0.46 and 0.02% of the surviving mutagenized cells screened for the three species, respectively. Mutants differed from their parents in a single nutritional requirement except in the case of SM29, a mutant ofM. fortuitum, and SM33, a mutant ofM. smegmatis, which differed from their parents in two auxotroph

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00238.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The loss of free sulphite in meat products, and thereby preservative potential, is associated with an increase in bound sulphite resulting in part from acetaldehyde production by yeasts. A medium containing Schiff's reagent was devised to detect sulphite‐binding yeasts. Yeast colonies that caused red colouration were recorded as acetaldehyde producers. Initially acetaldehyde‐producing strains (as enumerated on the detection medium) represented 60% of the yeast flora of preserved minced lamb but, as the free sulphite level diminished, non‐sulphite‐binding yeasts increased in

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00239.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The minimum inhibitory concentrations of four antibiotics used in listeria selective agars were determined at 30° and 37°C. Differences of susceptibility to β‐lactam antibiotics and fosfomycin were observed inListeria monocytogenes, L. seeligeriandL. ivanovii.Incubation at 30°C is recommended for listeria selective agars containing ceftazidime, cefotetan, latamoxef and fosfo

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00240.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Listeria monocytogenessurvived in meat, cheese and egg ravioli stored at 5°C for 14 d. Ravioli were considered edible for the first 9 d of storage. InitialL. monocytogenespopulations of 3 × 105cfu/g of ravioli were reduced to non‐detectable levels after heat treatment simulating that which would be used by the consu

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00241.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The survival of a human strain ofCampylobacter jejuniin raw, pasteurized and ultra‐heat‐treated goat's milk stored at 5°, 10°, 15° and 20°C was studied. No viable units were detected in raw milk after 24 h at 20°C and 48 h at 15°C. None were detected in pasteurized milk after 48 h at 20°C. In all other samples, there was a decline in viable units in the first 24 h but very little decline in the next 24 h period. The organism survived best at 5

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00242.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The sensitivity of four strains ofListeria monocytogenesto irradiation on poultry meat and in phosphate‐buffered saline was investigated. The D10values on poultry meat were 0.417–0.553 kGy depending on strain and plating medium used. Lower values were obtained in phosphate‐buffered saline. Generally tryptone soya yeast extract and McBride agars gave a better recovery (higher D10value) than listeria selective agar. The D10values forL. monocytogeneswere similar to those reported forSalmonellaspp. irradiated under similar conditions. Therefore irradiation doses suggested to eliminate salmonellas from poultry carcasses would also be sufficient to removeL. monocyto

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00243.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The phylogenetic position ofStreptococcus cecorumwas determined by reverse transcriptase sequencing of 16S ribosomal ribonucleic acid.Streptococcus cecorumformed a distinct group withEnterococcus faecalis(type species of the genusEnterococcus) and other enterococcal species, but was unrelated to members of the genusStreptococcus.On the basis of the present findings, it is proposed thatStreptococcus cecorumbe reclassified in the genusEnterococcus, asEnterococcus cecorumcomb. nov.

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00244.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Yeasts were a minor component (<5%) of the microbial contamination of pastures, fleece and carcass surfaces and remained so throughout the storage of preservative‐free minced lamb and lamb products The addition of sulphite, however, favoured the growth of yeasts to such an extent that they dominated the microflora, until free sulphite diminished to a level which permitted growth of the sulphite sensitive Gram‐negative bacteria, particularly pseudomonads and Enterobacteriac

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00245.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Book reviewed in this article:Anti‐TuberculousDrugs. Handbook ofExperimentalPharmacology, Volume 84 (1988). Edited by K. Bartmann.BacterialEndotoxins: PathophysiologicalEffects, ClinicalSignificance andPharmacologicalControl(1988). Edited by J. Levin, H.R. Buller, J.W. ten Cate, S.J.H. van Deventer&A. Sturk.A LaboratoryManual forLegionella(1988). Edited by T.G. Harrison&A.G. Taylor.MarineMicrobiology(1988). By B. Austin.BacterialEnergyTransduction(1988). Edited by C. Anthony.SingleCellOil(1988). Edited by R.S. Moreton.DiagnosticTechniques inMedicalParasitology(1988). By S.L. Fleck&A.H. Mood

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00246.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY