Article Abstract:
A chemically defined medium for suitable growth and nutritional requirement fulfillment of Leuconostoc mesenteroides strains contains lactose, 12 amino acids, Mn2+, Mg2+, uracil, eight vitamins, adenine and Tween 80. The composition of the chemically defined medium and the aerobic conditions stimulate the growth of various strains. Potassium phosphate is a suitable buffer. The growth rate in the medium is 0.85 plus or minus 0.10 h(super -1) and all strains attain an A620max of 1.60 plus or minus 0.12. Cell densities up to 3.5 x 10(super 9) CFU/ml are attained in the medium.
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Article Abstract:
The starvation response of Nitrosospira briensis on the cellular and subcellular level is investigated. The results show that N. briensis cells remain in a state allowing fast recovery of ammonia-oxidizing activity after addition of NH4(super +1) to a starved culture and maintaining cells in this kind of active state could be the survival strategy of ammonia-oxidizing bacteria in nature under fluctuating NH4(super +1) availability.
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Article Abstract:
A pH of 5 is necessary for the long-term survival of Leuconostoc mesenteroides and sucrose is a better food source than glucose and fructose. These conditions allow the bacterium to survive under starvation conditions. These bacteria are used in oil reservoirs to block undesirable flow channels.
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