- 著者
- Ikusaku AMEMIYA
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Imperial Academy (ISSN:03699846)
- 巻号頁・発行日
- vol.5, no.7, pp.284-286, 1929 (Released:2008-03-19)
- 参考文献数
- 4
- 被引用文献数
- 43
- 著者
- Toshitaka GAMO Kei OKAMURA Kyohiko MITSUZAWA Kenichi ASAKAWA
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.83, no.7, pp.199-204, 2007-07-30 (Released:2007-11-02)
- 参考文献数
- 29
- 被引用文献数
- 5 9
We successfully deployed an in situ automatic chemical analyzer sensitive to manganese (Mn) in seawater for a period of 81 days for the first time on the deep seafloor of Sagami Bay along a convergent plate boundary south of Japan. The in situ Mn analyzer (GAMOS-IV) was connected to a submarine cable as a means to supply power and to relay real time data. During the observation period from April 5 till June 25, 2006, the amount of measured Mn was seen to increase abruptly up to 10 times that of the background level only on April 21, probably triggered by a M5.8 earthquake which occurred ∼7 km south-southwest of the observation site. This study demonstrates the suitability of submarine cables for the long-term geochemical monitoring of deep sea environments.(Communicated by Taroh MATSUNO, M.J.A.)
- 著者
- Suzuki Masashi
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.79, no.9, pp.274-289, 2003
- 被引用文献数
- 1 25
Feast/famine regulatory proteins (FFRPs) include a diverse family of transcription factors of archaea and eubacteria. The best characterized among FFRPs is <i>E. coli</i> Lrp (the leucine-responsive regulatory protein). A full length FFRP is composed of an N-terminal DNA-binding domain and a C-terminal assembly domain. The C-domain is involved in formation of a dimer, and higher structures (e.g. a disk composed of 4 dimers, a chromatin-like cylinder) are further assembled. A pair of DNA-binding domains in an FFRP dimer bind the DNA site N<SUB>A</SUB>N<SUB>B</SUB>N<SUB>C</SUB>N<SUB>D</SUB>N<SUB>E</SUB>TTT<U>N</U><SUB>E</SUB><U>N</U><SUB>D</SUB><U>N</U><SUB>C</SUB><U>N</U><SUB>B</SUB><U>N</U><SUB>A</SUB>, where N<SUB>A</SUB> and <U>N</U><SUB>A</SUB>, e.g., are bases complementary to each other, and N<SUB>E</SUB> is either A or T. Such 13 bp sequences repeat with insertions of 7-8 or ∼18 basepairs in promoters regulated by FFRPs. Ligands of the size of amino acids (e.g. leucine, asparagine) signal metabolic or environmental changes directly to FFRPs by binding at the interface formed between dimers. This interaction alters the assembly form, and thus the overall DNA-binding specificity. In this way, Lrp regulates a large number of genes differently in <i>E. coli</i>. In <i>Pyrococcus</i> sp. OT3, 14 FFRPs possibly regulate many of the ∼1, 500 genes coded. It is widely believed that the common ancestor of all organisms first differentiated to archaea and eubacteria. Thus, global (i.e. genome wide) regulation by FFRPs can be the prototype of highly differentiated transcription regulatory systems found in organisms nowadays.<BR><BR>(Communicated by Masanori OTSUKA, M. J. A., Nov. 12, 2003)