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Influence of Incubation Atmosphere on Growth and Amino Acid Requirements of Streptococcus mutans

机译：孵化气氛对变形链球菌生长和氨基酸需求的影响

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The growth response of Streptococcus mutans representing antigenic type a or d in a chemically defined medium was influenced by the oxygen concentration of the growth atmosphere. Under controlled aerobic (1.5% O2) conditions these cultures attained a greater density than when the atmosphere contained 0.006% O2 or less. The growth of S. mutans strains representing antigenic types b or c in the defined medium was independent of the oxygen concentration of the growth environment. Under the conditions used in this study, none of the strains tested could utilize ammonium ion as a sole source of nitrogen for growth. The requirement for certain amino acids and inhibition by other amino acids varied with antigenic type and relative oxygen concentration of the growth environment. Under conditions where the atmospheric oxygen was reduced to 0.0006% O2 or less, the amino acid requirements of the cultures became either more numerous or more stringent. S. mutans strains of type c generally required the least number of amino acids, whereas cultures of type d had more numerous requirements. Nearly every culture tested under the anaerobic atmosphere was inhibited by one of the branched-chain amino acids, leucine, valine, or isoleucine. Methionine and lysine were also found to be inhibitory, particularly toward the type c strains.
机译：在化学成分确定的培养基中，代表抗原a或d的变形链球菌的生长反应受到生长气氛中氧气浓度的影响。在受控的有氧（1.5％的O2）条件下，这些培养物的密度比大气中含有0.006％或更低的O2时更高。代表抗原类型b或c的变形链球菌菌株在特定培养基中的生长与生长环境的氧气浓度无关。在本研究中使用的条件下，测试的菌株均不能利用铵离子作为生长的唯一氮源。对某些氨基酸的要求以及对其他氨基酸的抑制作用随抗原类型和生长环境的相对氧浓度而变化。在大气中氧气减少至0.0006％O2或更低的条件下，培养物中的氨基酸需求变得越来越多或更严格。 C型变形链球菌菌株通常需要最少的氨基酸数量，而D型培养物则需要更多的氨基酸。几乎在厌氧气氛下测试的每种培养物都被支链氨基酸之一亮氨酸，缬氨酸或异亮氨酸抑制。还发现蛋氨酸和赖氨酸具有抑制作用，特别是对c型菌株。

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