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Volume 27, Issue 1
Displaying 1-10 of 10 articles from this issue
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Yasuo SHIRAKIHARA1987 Volume 27 Issue 1 Pages 1-3
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSPhosphofructokinase from E. coli shows cooperative kinetics with respect to the substrate to fructose-6-phosphate, allosteric activation by ADP and inhibition by phosphoenolpyruvate. The crystal structure of the enzyme with active conformation has been solved, which allows us to discuss the allostery in this enzyme.View full abstractDownload PDF (1162K) -
Hajime FUJISAWA1987 Volume 27 Issue 1 Pages 4-8
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSThe following two developmental mechanisms underlying specification of neuronal connection between retinal axons and their targets were shown. First, growth cones of individual retinal axons recognize specific parts of brain as their targets. Second, a cell surfacerelated molecule named A5 seems to be a candidate molecule for this specific neuronal recognition.View full abstractDownload PDF (1986K) -
Takeshi IKEDA1987 Volume 27 Issue 1 Pages 9-12
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSA bacterial flagellar filament was found composed of the following elements arranged in series: the hook, two kinds of hook-associated proteins, the main filament composed of flagellin, and a "cap" at the tip. The entire flagellar filaments could be reconstituted in vitro from purified proteins.View full abstractDownload PDF (1409K) -
Yasuo MUKOHATA1987 Volume 27 Issue 1 Pages 13-16
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSA short review was given on halorhodopsin which was found and named by us in halobacteria, extremely halophilic archaebacteria. Halorhodopsin is a retinal protein that pumps in Cl- and builds up an inside-negative membrane potential in the light.View full abstractDownload PDF (486K) -
Kenichi YOSHIKAWA1987 Volume 27 Issue 1 Pages 17-21
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSChemical sensors that can detect various molecular species at low concentrations would be useful. The electrodes developed so far, such as, pH electrodes, measure the activities of test ions in solution as D.C. voltage differences generated when electrodes are immersed in solutions of these ions. In taste and olfaction, in contrast, electrical impulses in the nerve are generated at sensory organs by various chemical stimuli, that is, chemical information on chemical structure and concentration is converted into frequencies of nerve impulses. Thus to mimic the moleculal mechanism of recognition in sensory organs, an excitable artificial sensing system must be developed. In the present paper, we show the posibilities of developing a new type of chemical sensor capable of distinguishing various chemical substances on the basis of information on the frequency, amplitude and the shape of impulses. It is also demonstrated that pulsing or oscillation of membrane potential and electrical current is observed in artificial membranes with various lipids in the absence of any channel protein. These results are discussed in relation to the mechanism of gating in biomembranes.View full abstractDownload PDF (827K) -
Takeshi MISUNO, Shoji MIZUSHIMA1987 Volume 27 Issue 1 Pages 22-29
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSThe study of protein export, into or across membranes, has clearly become one of the liveliest areas in cell biology today, with rapid advances being made both in prokaryotic and eukaryotic cells. Studies of protein secretion across the membranes of the rough endoplasmic reticulum have led to the formulation of the signal hypothesis, which has stimulated many discussions and new ideas. Although bacterial cells do not contain organelles, they do have distinct compartments, such as periplasm and outer membrane. The translocation of proteins into the outer membrance and periplasmic space appeared to be amalogous to the initial step of secretion in higher organisms. The simplicity and the ease of genetic manipulability of bacteria made them the organisms of choice in the explorations of presumable universal mechanisms of protein secretion. In this review, keeping the universality in our mind, we described the successful biochemical and genetic studies of protein secretion.View full abstractDownload PDF (733K) -
Hajime TOKUDA1987 Volume 27 Issue 1 Pages 30-35
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSSome bacteria have been found to possess a primary sodium extrusion system. The system plays an important fole in energy transduction by generating a Na+ electrochemical potential difference, which is a useful energy for bacteria. Bioenergetics involving Na+ as a coupling ion is discussed in comparison with H+ -dependent bioenergetics.View full abstractDownload PDF (957K) -
Yoko YAMAGUCHI, Hiroshi SHIMIZU1987 Volume 27 Issue 1 Pages 36-41
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSFormation and evolution of semantic information in biogical systems must be studied from the view point of self-organization. For this purpose, we propose a kind of parallel processor, "holonic computer", which synthesizes the semantic information from external signals by means of the self-organization among autonomous unit processors. Our first model, called Holovision, demonstrates the synthetic processing in the pattern recognition.View full abstractDownload PDF (815K) -
Keiko GENGYO, Yasuhiro HATA, Hiroaki KAGAWA1987 Volume 27 Issue 1 Pages 42-45
Published: January 25, 1987
Released on J-STAGE: May 25, 2009
JOURNAL FREE ACCESSDownload PDF (1390K) -
[in Japanese]1987 Volume 27 Issue 1 Pages 46-47
Published: January 25, 1987
Released on J-STAGE: January 07, 2010
JOURNAL FREE ACCESSDownload PDF (150K)
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