From a population of cells of Pseudomonas aeruginosa sensitive 33 parts per million (ppm) and 0.1 mg per ml of quaternary
ammonium (QAC) and chloramphenicol respectively, pure strains
resistant to 750 ppm and 50 mg per ml of these antibiotics were isolated.
Lipids from the sensitive and resistant cells grown...
Freeze-dried concentrates (DRICONS) of lactic streptococcal
starter bacteria (single and mixed strains) were prepared in different
lyophilization media and stored under vacuum and several gases.
DRICONS were tested for survival and acid-producing activity after
storage for up to a year by rehydration with water to the original
pre-lyophilization volume. Acid...
In an attempt to determine the natural habitat of Streptococcus
lactis, Streptococcus cremoris, and Streptococcus diacetilactis 27
different species of vegetables, 18 species of fruits and many individual
cow raw milk samples were examined.
S. lactis was found to occur on potatoes, corn, cucumbers,
peas, beans, and cantaloupe. In each...
The presence of diacetyl in sufficient concentrations to cause
off-flavor in beer is a serious economic problem affecting the brewing
industry. Research was carried out in an attempt to provide an
industrially acceptable method for reducing diacetyl to safe levels
in beer, with additional applications to frozen concentrated orange
juice,...