Seibutsu Butsuri

State diagram of the energy trophic levels

Ei TERAMOTO

1994 Volume 34 Issue 6 Pages 233-237
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.233

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Dynamical processes of the energy flow networks are studied, using the theoretical model, reconstructed from a natural food web by unfolding its network structure. On the basic assumptions concerning the restrictions of energy metabolism, the criteria which determine the numbers of levels (or lengths of food chain) attainable in dynamically stable stationary states were obtained, in terms of parameters γ (the measure of effective energy production at consumer levels) and ε (the gross production rate of autotrophic level). The biomass (standing energy stock) of each level in an equilibrium state was also evaluated; and it was shown that when the highest possible level was filled, the system always exhibits a pyramid type structure of energy biomass.

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Pore-forming protein toxin

Physical and chemical properties of membrane affecting pore formation of staphylocaccal α-toxin

Toshio TOMITA

1994 Volume 34 Issue 6 Pages 238-243
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.238

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Pore-forming cytolysins have been isolated from a wide variety of prokaryotic and eukaryotic organisms. Some of them are the virulence factors for parasites such as bacteria and protozoa, the others being important factors in the defense system of host organisms. Pore-forming cytolysins are also taken up as models to study the mechanism of incorporation of water-soluble proteins into the lipid bilayer of cell membranes. This article refers to physical and chemical properties of membrane that affect binding, assembly and pore formation of Staphylococcus aureus α-toxin.

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A Model for Excitation and Oscillation

Masatoshi MURASE

1994 Volume 34 Issue 6 Pages 244-248
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.244

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A simple model is proposed to account for excitability and oscillation. Essential properties of the proposed model are discussed in the context of nonlinear dynamics. We explain how nerve excitation and oscillatory contraction in muscle occur in terms of the model behavior.

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Applications of micromachining for biology

Shuichi SHOJI

1994 Volume 34 Issue 6 Pages 249-252
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.249

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Applications of micromachining based on the semiconductor microfabrication technologies for biology are reviewed. Micro sensors of multi-electrodes recording probes and micro ISFETs have been fabricated. A cell sorter and microchambers for cell fusion operation have also developed. a DNA operator and a micro bioreactor are the interesting topics.

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[title in Japanese]

[in Japanese]

1994 Volume 34 Issue 6 Pages 253-255
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.253

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Phototransduction cascade in invertebrate visual

cells Multipul pathways coupling with rhodopsin in a single visual cell?

TATSUO Iwasa

1994 Volume 34 Issue 6 Pages 256-258
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.256

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Conversion of Transcription Factor Sp1 to Zn Finger Nuclease

Jun KUWAHARA

1994 Volume 34 Issue 6 Pages 259-261
Published: November 25, 1994
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.2142/biophys.34.259

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