The Assimilability of Glucose and Xylose in Rhodopseudomonas sp. K-7.

Rhodopseudomonas sp. K-7 의 당자화성

The assimilability of glucose and xylose of Rhodopseudomonas K-7, whose hydrogen evolution has been characterized previously, was investigated under the anaerobic photosynthetic and the aerobic dark conditions. This organism is able to grow well in the medium containing glutamate and malate as organic substances under the anaerobic light condition. However, the substitution of glucose for malate retarded the growth rate, while the addition of glucose to the seed culture remarkably promoted the utilization of glucose added in the main culture. Optimal glucose concentration in the seed culture to induce glucose assimilability of the organism was around the concentration of 60 mM of glucose. Then, the seed culture grown in the medium containing 60 mM of glucose were inoculated in the medium containing 10, 20, 30, 60 and 100 mM of glucose respectively. The results were revealed that the consumable content of glucose was limited even though the high concentrations of glucose was contained in the medium. The consumption of considerable amount of glucose was observed when cultured under the aerobic dark conditions than the anaerobic illuminated conditions.

Rhodopseudomonas K-7은 혐기 광조건과 호기암조건에서 glucose, xylose로 이용하면서 성 장할 수 있었는데, 종배양시 glucose를 첨가하는 것이 본 배양에서 glucose자화를 촉진시켰고, glucose 60mM 배지에서 배양한 것을 종균으로 했을 때, glucose이 용량이 가장 많았다. Glucose 60mM배지에서 배양한 것을 종균으로 했을 때, 배지의 glucose 농도가 높더라도 이용할 수 있는 glucose양은 제한되어 있었다. 혐기 광조건에서 보다는 호기 암조건에서 성장속도도 빨랐고, glucose, xylose자화량도 많았다.