海洋中のキシラン分解細菌に関する研究-5-P.S.値の測定によるβ-1,3'-キシラン分解細菌のキシラン分解能の格付けについて

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The distribution of β-1, 3'-xylan-decomposing bacteria in the coastal waters of Yoshimi, Shimonoseki, was reported in the previous paper1), where 64 strains were isolated from sea water, marine sediments and seaweeds in the region. In the present study, β-1, 3'-xylan-decomposing activity of these strains was examined, by almost the same method the authors2) had designed to determine, β-1, 4'-xylan-decomposing activity of the xylan-decomposing bacteria. The results obtained, are summarized as follows: 1. The determination of the P. S. value which may be indicative of xylan-decomposing activity of the various strains, may be useful for grading β-1, 3'-xylan-decomposing activity as well as, β-1, 4'-xylan-decomposing activity of the bacteria. 2. On the basis of the P. S. value determined, the β-1, 3'-xylan-decomposing activity of the bacteria was divided into 6 grades, and it was observed that 40 strains of the 64 examined, belonged to the 3 highest grades of xylan-decomposing activity. 3. Of the strains examined, 37 strains possessed β-1, 4'-xylan-decomposing ac-tivity together with, β-1, 3'-xylan-decomposing activity and showed the developed tendency to possess both the activities to a high degree.
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