Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Z. John Ordal"'
Autor:
Z. John Ordal, Russell S. Flowers
Publikováno v:
Journal of food protection. 42(4)
Many of the operations employed in food processing can sublethally damage staphylococci, temporarily rendering the cells incapable of growth on selective media commonly employed for their enumeration. Stressed staphylococci are, under the proper cond
Autor:
Z. John Ordal, Rose Klora Busch
Publikováno v:
Journal of bacteriology. 51(6)
Autor:
Z. John Ordal, Gary H. Adams
Publikováno v:
Journal of Food Science. 41:547-550
Conidia of Aspergillus parasiticus (an aflatoxin producer) were harvested from an agar medium, centrifuged, and resuspended in 0.05% Tween-80. The suspension was subjected to a thermal stress of 51°C for up to 4 hr. Viability and thermal injury were
Publikováno v:
Applied Microbiology. 16:524-527
Seventeen strains of lactic acid bacteria were assayed for their glycerol ester hydrolase activity by using an improved agar-well technique, and eight strains by determining the activity in cell-free extracts using a p H-stat procedure. All cultures
Publikováno v:
Canadian Journal of Microbiology. 9:251-258
A replacement technique, whereby spores of Bacillus cereus were produced by transferring vegetative cells into non-nutritive solutions, was employed for the investigation of the relationship between calcium, dipicolinic acid (DPA), and heat resistanc
Autor:
Z. John Ordal, F. F. Busta
Publikováno v:
Applied Microbiology. 12:106-110
A method, based on germination with 50 m m CaCl 2 and 40 m m sodium dipicolinate (Na 2 DPA), was developed for the determination of total viable counts of bacterial spores requiring heat activation. Incorporation of these germinating agents into Tryp
Publikováno v:
Journal of Food Science. 20:554-558
Publikováno v:
Journal of Dairy Science. 47:604-611
Summary Tests were made to determine the effect of manufacturing procedures for specific varieties of cheese on the growth and survival of Staphylococcus aureus (MF31) organisms added to milk at the start of the process. The staphylococcal count was
Autor:
Z. John Ordal
Publikováno v:
Journal of Milk and Food Technology. 33:1-5
Publikováno v:
Canadian Journal of Microbiology. 18:1015-1021
The heating of Salmonella typhimurium 7136 at 48C produced a sublethal injury. When injured cells were placed in fresh growth medium, they recovered within 3 h their normal tolerance to Levine Eosin Methylene Blue Agar containing 2% NaCl (EMBS). An i