摘要:
Yogurt is prepared with a mixture of milk powder and novel Lactobacillus thermophilus (also known as Bacillus coagulans) spores that have specific characteristics of requiring nourishment at the time of spore formation, being capable of high speed acid formation, taking a short time for transition into germ cells after budding and being highly thermobiotic so as to kill or inhibit during yogurt fermentation the growth of undesirable saprophytes including spore forming saprophytes present in yogurt which serve to putrify or spoil the yogurt. To prepare yogurt, boiling water is added to the mixture to kill or inhibit the growth of saprophytes and the mixture is permitted to ferment for a relatively short period of time.
摘要:
A novel mutant strain Streptococcus diacetilactis NRRL-B-8177 which is particularly adapted for the preparation of creamed Cottage cheese without fermentation (or prior incubation) of the creaming mixture or dressing is described. This strain produces about one-half of the acid produced by S. diacetilactis 18-16 which is regarded as the best bacterium that is commercially available for use in Cottage cheese. Improved flavor and prophylaxis against spoilage bacteria of the dressed Cottage cheese is preferably provided by blending a concentrate of the Streptococcus diacetilactis NRRL-B-8177 cells with a creaming mixture at less than about 50.degree. F. (10.degree. C.) and then mixing the cold cream mixture with dry Cottage cheese curd cooled to less than about 50.degree. F. and maintaining the temperature at less than about 50.degree. F.
摘要:
A method for cultivating fast growing bacteria and their stable metabolites in order to reach optimal cultivating time is disclosed which comprises introducing a volume of inoculum containing the bacterium sought to be cultivated and a quantity of nutriment containing a nitrogen source, growing factors, a carbon source, and a pH-stabilizer into a fermentor. The volume of inoculum in the fermentor is utilized as a production determinative factor and is determined according to the following equation:a = V.multidot.n/2.sup.twherea = volume of inoculum in litersV = cultivating medium's total volume in litersn = bacterium strain's generation time in hourst = cultivating time in hours.The result is that a grown cultivating medium is obtained which includes a mass of the desired bacterium.
摘要:
The resistance of calves to gastro-intestional disorders due to infection by pathogenic E. coli species is improved by stimulating the calf intestine to produce antibodies to the bacteria. The endotoxins of such infective strains are introduced into the intestine by way of the mouth, for example in water or in a calf feed, preferably beginning early in the life of the calf, at the age of 4-10 days.
摘要:
The present invention is concerned with a string culture inoculum comprising a string having stabilized cells of one of______________________________________ Salmonella typhimurium ATCC 6994 Klebsiella pneumoniae ATCC 10031 Enterobacter cloacae ATCC 11367 Escherichia coli ATCC 25922 Citrobacter freundii ATCC 6750 Proteus vulgaris ATCC 881 Pseudomonas aeruginosa ATCC 15442 Shigella sonnei ATCC 11060 Serratia marcescens ATCC 14756 Staphylococcus aureus ATCC 25923 Staphylococcus epidermidis ATCC 17917 Streptococcus faicalis ATCC 10541 Streptococcus pyogenes ATCC 12202 ______________________________________ dispersed throughout, said string culture inoculum having a sufficient number of stabilized cells adhered thereto to produce at least 10.sup.5 cells per milliliter upon incubation in 3 milliliters of suitable broth at 37.degree. C. for 2 hours. The string culture inocula of the present invention are useful as quality control cultures for positive as well as negative controls in clinical bacteriology procedures and drug susceptibility testing.
摘要:
Bulk starters having optimized ratios of coccus (Streptococcus thermophilus) to rod (lactobacilli) bacteria are prepared in a whey-based culture medium characterized by defined proportions of acid-whey solids to sweet-whey solids, the sweet-whey preferably being partially delactosed whey. The medium and method are particularly adapted for use in manufacturing pasta filata cheeses.
摘要:
Starter cultures are produced using a culture medium containing undecalcified sweet whey, undecalcified nonfat dry milk, a nitrogen source and a citrate source. The medium provides the advantages of greater reliability, higher viable bacteria number, and higher acidities in a shorter time. Due to enhanced activity of starter cultures produced on the medium, only about 0.75 to about 1 part starter culture per 100 parts of milk is required in making cheese.