著者

Kazuhide KIMBARA Toshiyuki HASHIMOTO Masao FUKUDA Takao KOANA Masamichi TAKAGI Michio OISHI Keiji YANO

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Agricultural and Biological Chemistry (ISSN:00021369)

巻号頁・発行日

vol.52, no.11, pp.2885-2891, 1988 (Released:2006-04-05)

参考文献数

27

被引用文献数

19

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A mixed culture composed of two Pseudomonas strains, designated as KKL101 and KKS102, was isolated from soil. This mixed culture had an enhanced ability to degrade various polychlorinated biphenyls (PCBs) which include highly chlorinated components. They did not grow individually on the mineral salts medium supplemented with a highly chlorinated PCB (PCB48, a mixture of mainly tetrachlorobipheny1) and biphenyl. When the spent medium of KKL101 was added to the washed cell preparation of KKS102, however, the latter grew on these carbon sources, producing yellow compounds which were identified as metabolic intermediates of the carbon sources, biphenyl and PCBs. These results suggest that KKL101 produces a growth factor(s) essential for KKS102 to grow on PCBs and that the growth of KKL101 is supported by the metabolic intermediates produced by KKS102. It appears that these two bacterial strains have a symbiotic relationship. From the analysis of the degradation products of various PCB congeners, it was found that strain KKS102 degrades a wide range of PCBs which have been considered to be refractory to biological degradation.

著者

Masamichi Takagi Balazs Gerofi Norio Yamaguchi Takahiro Ogura Toyohisa Kameyama Atsushi Hori Yutaka Ishikawa

雑誌

研究報告システム・アーキテクチャ(ARC) (ISSN:21888574)

巻号頁・発行日

vol.2015-ARC-215, no.1, pp.1-8, 2015-05-19

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Processor core count in high-end computing has seen a steady increase during the past decade and next generation supercomputers will likely deploy many-core based systems. At the same time, from a software environment point of view, Linux-compatibility has become wide-spread in the High Performance Computing (HPC) domain. We consider the challenges of operating system (OS) design targeting next generation high-end computing. We believe that the most urging issues to be addressed are as follows. (1) Exploiting deep memory hierarchies, (2) Reducing cache pollution by OS services and minimizing OS noise, (3) Making it easy to design and deploy application specific kernels, (4) Providing a Linux compatible programming / run-time environment and (5) Enabling seamless tracking of upstream Linux kernel changes. We contend that existing approaches to HPC operating systems, which either employ a stripped down Linux environment or a specific light-weight kernel built from scratch, are not feasible to deal with these challenges. In this paper, we discuss the design decisions of our proposed hybrid kernel design for providing a Linux-compatible light-weight kernel.