All issues
Volume 8 (1983)
- Issue 6 Pages 328-
- Issue 5 Pages 258-
- Issue 4 Pages 194-
- Issue 3 Pages 130-
- Issue 2 Pages 66-
- Issue 1 Pages 2-
Volume 8, Issue 4
Displaying 1-7 of 7 articles from this issue
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Noriaki Takeguchi1983 Volume 8 Issue 4 Pages 194-203
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSMovements of ions such as H+, Cl-, Na+, K+, Ca2+, and HCO3- in parietal cells are summarized. (Na+, K+) -ATPase (Na+/K+ antiport), an exchange diffusion system (Cl-/HCO3- antiport) and a NaCl symport system exist in the serosal (basolateral) membrane of the parietal cell, whereas (H+, K+) -ATPase (H+/K+ antiport) and K+-recycling system exist in the secretory (apical) membrane. The role and inter-connection of these ion transporting systems to produce gastric acid is elucidated from various levels of studies on gastric mucosa in vitro, gastric gland, parietal cell, gastric vesicles and artificial planar bilayer. Furthermore, hormonal regulation of acid secretion by histamine, acetylcholine, gastrin, and c-AMP in regard to ion transport is also summarized.View full abstractDownload PDF (1442K) -
Yoshiya Shinagawa1983 Volume 8 Issue 4 Pages 204-211
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSTheoretical basis for the overshoot uptake of n-glucose of the human erythrocytes and the intestinal brush border membrane vesicles is provided by means of the equation system of membrane transport. The overshoot uptake occurs when the solute concentration in membrane phase is higher than that in outside solution. It is shown that high concentration of solute in membrane phase drives the membrane oscillation being the type of limit cycle.
1. Introduction.
2. Two compartment cannot provide the overshoot uptake.
3. Experiments on the overshoot uptake.
4. Equation system of membrane transport.
5. Limit cycle oscillation drived from the membrane transport equations.
6. Conclusion.
Mathematical appendix.
The computer aided mathematical method to prove existence of the limit cycle is described in the mathematical appendix.View full abstractDownload PDF (1154K) -
a practical method of fablicationYoshiyuki Miyaki, Teruo Fujimoto1983 Volume 8 Issue 4 Pages 212-224
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIn order to prepare charge-mosaic membranes, many attempts have been made by many authors. In this article a historical survey is presented on the development of the methods for fablicating such membranes. A multiblock copolymer method is considered to be one of the most promising methods. Suitably designed ISIAI-type pentablock copolymers consisting of isoprene (I), styrene (S), and 4-vinylbenzyldimethylamine (A) with a three-layer-lamellar structure are stable to chemical treatments and successfully give a charge-mosaic membrane which shows a piezodialytic effect and a very high salt permeability. This membrane is useful for desalination of aqueous solutions containing organic substances of low molecular weights.View full abstractDownload PDF (3168K) -
Noboru Mataga1983 Volume 8 Issue 4 Pages 225-238
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSBehaviors of heteroexcimers between pyrenes and N, N-dimethylanilines as well as dicyanobenzenes in aqueous micellar solutions, detergent vesicles and bilayer liposomes have been investigated by means of fluorescence measurements and laser photolysis. Strong quenching of pyrene fluorescence with those quenchers was observed while no heteroexcimer fluorescence was detected in detergent micellar and vesicle solutions. However, weak heteroexcimer fluorescence of pyrene-dimethylaniline systems was detected in single bilayer liposomes of phosphatidylcholines. The dependences of relative fluorescence yield and fluorescence decay curve upon the quencher concentration have been explained with equations derived on the basis of simple model. In accordance with the results of fluorescence measurements, the laser photolysis studies have demonstrated clearly the formation of ion radicals due to electron transfer in the case of micelles and detergent vesicles. Moreover, important roles of surface charges of these systems in the photoinduced charge separation processes have been confirmed. On the other hand, aggregation of dye ions due to the interaction with detergent micelles, premicelles, vesicles and high polymer electrolyte with opposite charges has been investigated by measuring the excimer formation and excitation transfer phenomena with ns and ps laser spectroscopic methods, results of which provide important informations upon the formation processes and structures of these organized systems.View full abstractDownload PDF (1591K) -
Shozo Miyazaki, Shigemi Takeuchi, Mieko Sakamoto, Masahiko Takada1983 Volume 8 Issue 4 Pages 241-242
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSEthylene-vinyl alcohol (EVA1) copolymer was evaluated as a controlling membrane for the release of anticancer agents, 5-fluorouracil and ftorafur. The effect of comonomer ratio modifications on the drug permeation was studied. EVA1 copolymer membranes of ethylene contents of 32, 44, and 47 mol% were used. An increase in ethylene content of EVA1 copolymer decreased the drug permeability through the copolymer membranes.View full abstractDownload PDF (219K) -
Shintaro Furusaki, Tatsuji Kikuchi1983 Volume 8 Issue 4 Pages 243-248
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSContinuous separation of proteins is studied by using electrophoresis. The apparatus is composed with electrophoresis cells which are separated by porous membranes. The value of pH is adjusted so as to be low near the anode and high near the cathode. Intermediate cells stand at intermediate values of pH. Some cells stand at pH's of the isoelectric points of desired proteins. By the driving forces originated by the electric potential field, proteins migrate toward the cells at their isoelectric points. This separation, continuous isoelectric focusing, is studied by measuring extent of migration of bovine serum albumin. Experimental results are discussed by use of a theory considering electrochemical mobility and flow pattern inside the cells.View full abstractDownload PDF (577K) -
Hezhe Zhang, Katsuhisa Sekine, Tetsuya Hanai, Naokazu Koizumi1983 Volume 8 Issue 4 Pages 249-254
Published: July 01, 1983
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSDielectric measurements were carried out on polystyrene films immersed in various kinds of electrolyte aqueous solutions. The observed dielectric relaxations were of the Debye type which was characteristic of the series combination of the polystyrene film and the ambient aqueous solution. Approximate formulas were derived of the dielectric theory of interfacial polarization for the bilamellar structure under the condition that the capacitance is much larger for the film than for the aqueous solution. Capacitance and conductance of the underwater film were evaluated from the dielectric observations by use of these approximate formulas. The film capacitance remained unchanged irrespective of the tonic species and the concentration of electrolyte solutions used, being inversely proportional to the thickness of the films. The relative permittivity of the polystyrene films was estimated to be 2.65. The ratio of the film conductivity to the solution conductivity for the same film was unaffected by the change in the concentration of electrolyte solutions, being in the order of 10-4. These features of the film capacitance and the conductivity ratio suggest that micropores in the film filled with the ambient electrolyte solutions are responsible for the electric conduction of the present underwater films.View full abstractDownload PDF (640K)
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