Das Wuchsstoffsystem der Milchsäurebakterien

Vitamin Content of Ingredients of Microbiological Culture Media

“…Assuming that the dehydrated culture media ingredients are employed in the usual 1 or 2 per cent concentration, it is evident that such media may be deficient in thiamine, riboflavin, pantothenic acid, pyridoxine and paminobenzoic acid. For example, beef extract or peptone or a combination of the two (nutrient broth) may not supply sufficient thiamine for optimum growth (2) 1.0 (7) 0.031 (8) 0.50 (9) 0.05 (10) 0.20 (11) 1.25 (12) 0.20t (13) 1.0 micrograms per cc. of medium (14) 0.20…”

Chemistry and Enzymology of Nucleic Acids

“…One of the obstacles in using microorganisms for purine and pyrimidine assay is their lack of fastidiousness with respect to the type of base utilized. It seems that the ability to interconvert the purines and pyrimidines according to need has not been lost by the bacteria in most instances, and often the bases serve as growth stimulants rather than essentials (222,227,294,329,369,371,426). The field is barely touched, however, and, no doubt, elaboration of microbiological methods analogous to the techniques of vitamin determi-470 F. SCHLENK nation will be forthcoming (22a).…”

Effects of Anions and Cations on Sugar Utilization in Cucumber Juice Fermentation

“…In nature, most of the bioelements occur as salts, and they are readily taken up by LAB as anions such as chloride and sulfate, and cations such as sodium, potassium, and ammonium, respectively. Several studies have shown that manganese ions stimulate growth, enhance lactic acid production, and reduce the fermentation time by L. plantarum (Moller 1939;Raccach and Marshall 1985;McDonald and others 1991). Cations including Na + , K + , Ca 2+ , and Mg 2+ are cofactors of many enzymes involved in transport and metabolic processes (Lehninger 1950;Raccach 1985;Yamada 1987).…”