著者
三室 守
出版者
一般社団法人日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.48, no.2, pp.88-96, 2008-03-25

Several essential points of photosynthetic light reactions were reviewed for future development of this scientific field and a general interest of biophysicists. Historical backgrounds of the reaction systems were also stated for the continuity of problems. Main points are reaction schemes and mechanisms of photochemical reactions in reaction center complexes, oxygen evolution, i.e. water cleavage and a high redox potential for water oxidation, and structures of reaction center complexes. These points will be solved by combination of spectroscopy and molecular biology. Photosynthesis will be utilized for our survival in the 21st century through their potentials in food supply, solar energy conversion and sustainable environmental preservation.

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出版者
一般社団法人 日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.54, no.2, pp.124-124, 2014 (Released:2014-03-28)
著者
内山 郁夫
出版者
一般社団法人日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.42, no.6, pp.266-269, 2002-11-25

MBGD is a database system for making use of rapidly accumulating microbial genome sequences through comparative analysis. The basic function of MBGD is to create an orthologous gene classification table, which comprises sets of "equivalent" genes among multiple genomes. In MBGD, classification tables can be created on demand with specified set of organisms and parameters. This feature becomes important to understand diversity of genomes using almost a hundred genome sequences now available.

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著者
河野 敬一
出版者
一般社団法人 日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.48, no.4, pp.213-213, 2008 (Released:2008-07-25)
著者
中岡 保夫
出版者
一般社団法人 日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.28, no.4, pp.194-197, 1988-07-25 (Released:2009-05-25)
参考文献数
12

Mechano-, thermo- and photo-stimulation of Paramecium cell elicits changes in the membrane potential called receptor potentials. The receptor potentials are caused by modulating ionic conductances of specific channels localized on the cell surface.
著者
福森 義宏 田岡 東
出版者
一般社団法人 日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.54, no.1, pp.011-014, 2014 (Released:2014-01-29)
参考文献数
19
被引用文献数
1

Magnetosomes synthesized in magnetotactic bacteria function as a cellular compass to navigate along the Earth’s magnetic field. The magnetosome contains various types of specific associated proteins. Most of the magnetosome-associated proteins are encoded in gene clusters within a genetic “magnetosome island,” which is essential for the synthesis of magnetosomes. Our atomic force microscopy studies indicated that the thickness of the organic layer wrapped around the magnetite crystal was ~7 nm, and magnetosome-associated protein MamA was localized at the surface of the organic layer. In this review we present recent progress on “Structure and Function of Magnetosomes” and propose the structural model of magnetosomes in the cell.
著者
古賀(巽) 理恵 古賀 信康
出版者
一般社団法人 日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.53, no.4, pp.190-193, 2013 (Released:2013-07-25)
参考文献数
15
被引用文献数
3

Protein folding occurs because the native interactions collectively outweigh non-native interactions, resulting in funnel-shaped energy landscapes. The funnel-shaped landscapes of natural proteins are rugged due to evolution for function or neutral drift. We describe an approach to designing ideal protein structures stabilized by consistent local and non-local interactions. The approach is based on rules relating local structures to tertiary motifs, which make possible the design of strongly funneled energy landscapes. Guided by these rules, we succeeded in designing five ideal alpha-beta protein structures with different topologies completely from scratch. These results illuminate how the folding funnels of natural proteins arise.
著者
小林 泰夫
出版者
一般社団法人日本生物物理学会
雑誌
生物物理 (ISSN:05824052)
巻号頁・発行日
vol.31, no.3, pp.133-141, 1991-05-25
被引用文献数
1

Sporulation of Bacillus subtilis is induced by the deprivation of the nutrients in the medium. During sporulation more than 50 sporulation qenes (spo) are expressed sequentially. The sequential expression of spo genes is regulated mainly at the level of transcription, which is governed by the cascades of five sporulation-specific sigma factors, σ^H, σ^F, σ^E, σ^G, and σ^K. At the initiation of sporulation, the first sporulation specific sigma factor σ^H is activated, which then activates spoIIA operon encoding the second sigma factor σ^F. Expression of spoIIA and spoIIE operons is required for the activation of the pro-σ^E, the inactive precursor of the third sigma factor σ^E, which is required for the expression of the fourth sigma factor σ^G. σ^G is present only in the forespore, but its function is required for the activation of the pro-σ^K, which is present only in the mother cell. sigK gene encoding σ^K is construted by the mother cell-specific DNA rearrangement occurring during the middle stage of sporuation.