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Autor:
Larry R. Beuchat
Publikováno v:
Journal of food protection. 47(7)
Aspergillus differential medium (ADM) and Aspergillus flavus / parasiticus agar (AFPA) were compared for enumerating total yeasts and molds as well as the A. flavus group in raw peanuts, corn meal and cowpeas. Colony counts were made after plates wer
Publikováno v:
Journal of food protection. 47(11)
Two gram-positive microorganisms, a spore-forming rod and a coccus, were isolated from a can of evaporated milk which had coagulated after storage at 37°C for 3 months. The two strains were identified as Bacillus subtilis and Enterococcus faecium ,
Publikováno v:
Journal of food protection. 47(1)
Raw skim milk was inoculated (1%, v/v) with a proteolytic psychrotrophic bacterium that previously was isolated from milk. The inoculated skim milk was incubated at 7°C for 0, 3, 5 and 7 d. The pH values for the milk were 6.6, 6.5, 6.45 and 5.95, an
Autor:
Peter Boleszczuk, Phyllis Entis
Publikováno v:
Journal of food protection. 46(9)
A method was developed for direct enumeration of Vibrio parahaemolyticus in foods by hydrophobic grid membrane filter. The method consisted of a 4-5 h resuscitation step to recover injured cells, followed by overnight incubation at 42°C on V. paraha
Publikováno v:
Journal of food protection. 46(4)
Raw milk (100 samples) and pasteurized milk (100 samples) were assayed for presence of Yersinia enterocolitica , using four different enrichment and post-enrichment techniques. Isolation of Y. enterocolitica was made on MacConkey agar and Cefsulodin-
Publikováno v:
Journal of food protection. 45(10)
Counts and taxonomic distribution of typical colonies on violet red bile agar (VRB) and VRB with 1% glucose (VRBG) incubated at 45, 35, 20, 7 and 1 °C from 23 retail food samples were compared. Aerobic plate counts were also obtained at each incubat
Publikováno v:
Journal of food protection. 45(2)
The viability of four species of microorganisms ( Escherichia coli , Staphylococcus aureus , Pseudomonas aeruginosa and Saccharomyces cerevisiae ) during rapid and slow thawing of frozen milk was investigated. Results indicated that the destruction o
Autor:
M. I. Ali, A. H. Abu-Zinada
Publikováno v:
Journal of food protection. 45(9)
The fungal counts per gram of air-dried dates, of eight local date-palm varieties, varied markedly on different synthetic media. Seri and Shakra varieties had highest fungal counts whereas Medina had the lowest. Aspergilus flavus , A. niger , Penicil
Publikováno v:
Journal of food protection. 45(9)
Adhesion of the thermoresistant bacterium Streptococcus thermophilus to the surface of a heat exchanger and deposition of milk constituents during long operating times were investigated. Experiments were carried out on a pilot plant pasteurizer with
Autor:
Michael P. Doyle, Debra J. Roman
Publikováno v:
Journal of food protection. 45(6)
Several factors were shown to influence the rate of inactivation of Campylobacter sp. when dried on a glass surface. These included strain, temperature and humidity, and medium used to suspend the organism. Of the strains evaluated, all of three isol