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Biomedical subjects

K Asami

Publications and source records attributed to K Asami.

At least 109 records · Page 6Linked to original sources
PubMed1981

Dirofilaria immitis infection in man: report of a case of the infection in heart and inferior vena cava from Japan.

Two slender nematodes were incidentally found at autopsy in the heart and inferior vena cava of a 36-year-old Japanese man who died of liver cirrhosis. The parasite from the heart measured 29.5 cm by 0.87 mm, and that from the inferior vena cava 26.5 cm by 0.85 mm. The worms were identified as non-gravid adult female Dirofilaria immitis. This is the fourth case of infection with D. immitis in the heart and large vessels.

Adult↗
PubMed1980

Dielectric analysis of Escherichia coli suspensions in the light of the theory of interfacial polarization.

Dielectric measurements of Escherichia coli suspensions were carried out over a frequency range from 10 kHz to 100 MHz, and marked dielectric dispersions having characteristic frequency of approximately 1 MHz were observed. On the basis of the cell model that a spheroid is covered with two confocal shells, a dielectric theory was developed to determine accurately four electrical parameters for E. coli cells such as the conductivity of the cell wall, the dielectric constant of the cell membrane, and the dielectric constant and the conductivity of the protoplasm. The observed data were analyzed by means of the procedure based on the dielectric theory to yield a set of plausible electrical parameters for the cells. By taking account of the size distribution of the cells and a dielectric relaxation of the protoplasm, the observed dispersion curves were successfully reconstituted by the present theory.

Biophysical Phenomena↗
PubMed1976

Dielectric properties of yeast cells.

Dielectric measurements were made on suspensions of intact yeast cells over a frequency range of 10kHz to 100 MHz. The suspensions showed typical dielectric dispersions, which are considered to be caused by the presence of cytoplasmic membranes with sufficiently low conductivity. Since the conductivity of the cell wall was found to be of nearly the same value as that of the suspending medium, composed of Kcl solutions in a range from 10 to 80 mM, the cell wall may be ignored in establishing an electrical model of the cells suspended in such media. An analysis of the dielectric data was carried out by use of Pauly and Schwan's theory. The membrane capacitance was estimated to be 1.1+/-0.1 muF/cm2, which is compared with values reported so far for most biological membranes. The conductivity of the cell interior was almost unchanged with varying KCl concentrations and showed low values owing to the presence of less conducting particles, presumably intracellular organelles. The relatively low dielectric constant of about 50 obtained for the cell interior, in comparison with values of aqueous solutions, may be attributed also to the presence of intracellular organelles and proteins.

Cell Membrane↗