Hidefumi Hayashi

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Purpose. We applied non-invasive and real-time method with in vivo ESR spectroscopy to determining pharmacokinetics and metabolism of lipid emulsion as a drug carrier in living mice. Methods. A spin-labeled triglyceride (SL-TG) was newly synthesized and lipid emulsion containing SL-TG was prepared. In vivo ESR spectra in mice were observed after intravenous(More)
Excitation of Nitella internodal cell was investigated as an example of the phase transition in an open system far more thermal equilibrium. The power density spectrum of the membrane potential fluctuation had a bulge in a frequency range lower than 1 Hz at the resting state and a peak at approximately 0.03 Hz at a depolarized state near the threshold. A(More)
Conduction in inward rectifier, K+-channels in Aplysia neuron and Ba++ blockade of these channels were studied by rapid measurement of the membrane complex admittance in the frequency range 0.05 to 200 Hz during voltage clamps to membrane potentials in the range -90 to -40 mV. Complex ionic conductances of K+ and Cl- rectifiers were extracted from complex(More)
Purpose. The stability of lipid emulsions (LE) containing various cosurfactants (oleic acid, cholesterol, Tween 80, or HCO-60) was evaluated using the maximum total interaction energy, Vt max, and the energy barrier for coalescence, W. Methods. The Vt max and W were calculated from the ζ potential and the rate of increase in LE particle size, respectively.(More)
The particle size of lipid emulsion (LE) is changed by flocculation and coalescence. This change in particle size was studied using values obtained for maximum total interaction energy (Vtmax) for flocculation and activation energy for coalescence (E). Vtmax was calculated using DLVO theory, and E was calculated from the rate of increase in particle size in(More)
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