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Biomedical subjects

S Asada

Publications and source records attributed to S Asada.

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

Pharmacokinetic study on saturated hepato-biliary transport of acetyl procainamide ethobromide.

Pharmacokinetic analysis of plasma concentration of acetyl procainamide ethobromide (APAEB) after single injection of 1.5, 8.8 and 20 mumol/300 g rat of APAEB showed that its elimination from plasma followed saturation kinetics. The existence of saturable step in transport of APAEB from blood to bile was also evident from the data of the biliary excretion at three dose levels. The data of the biliary excretion were well fitted to two compartment model with two saturable processes at the hepatic uptake and the biliary excretion. The Michaelis-Menten parameters were calculated according to that model. The model was also applicable to the data of biliary excretion obtained by constant infusion of APAEB Simulation of liver and plasma content gave a good agreement to the experimental data. All these results indicate that the pharmacokinetics of APAEB is satisfactorily represented by the proposed model.

Acecainide↗
PubMed1980

Mutation induced by drying of Escherichia coli on a hydrophobic filter membrane.

Drying of Escherichia coli to a required cellular water level was conducted on a hydrophobic membrane at the corresponding relative humidity. Mutation from an arginine auxotroph to the prototroph was induced by drying to a water activity (aw) of 0.53 and below, but not to an aw of 0.75 and above. The critical aw below which mutation occurred in the course of drying was similar to that for induction of deoxyribonucleic acid (DNA) strand breakage in the bacteria. Some ultraviolet or gamma-irradiation-sensitive strains, e.g., strains of carrying recA, recB, and uvrA recA were more sensitive to drying than the wild-type strains or strains carrying uvrA and polA. The DNA strand breakage of every strain was observed to be to a similar extent after drying to an aw of less than 0.53. The drying-resistant strains repaired the damaged DNA partially during postdrying incubation in a growth medium but not in phosphate buffer solution, while the drying-sensitive strains could not at all. Significant mutation on drying occurred in the wild-type strains, strains carrying uvrA and polA, but not in strains carrying recA. It is, therefore, concluded that the mutation is caused by errors in rec-dependent repair of the drying-induced breakage in DNA.

Centrifugation, Density Gradient↗
PubMed1980

Surgical treatment of idiopathic hypertrophic subaortic stenosis in children.

Five children with idiopathic hypertrophic subaortic stenosis (IHSS) were operated upon during the past 7 years and all survived. Their ages ranged from 4 years and 5 months to 14 years (mean 8 years and 5 months). The operations performed were 1 right ventricular myectomy and 4 transaortic left ventricular myotomies. Whether surgery performed in childhood would change the natural history or not is still unknown, however, according to our results and many available reports, we have so far reached the following conclusions; 1. Transaortic left ventrlcular myotomy or myectomy is a safe and effective operation for localized muscular subaortic stenosis in children. 2. Because the disease is progressive, operation in childhood may be worth to be considered, when the resting or provocative pressure gradient is excessive. 3. For those who have a marked increase in left ventricular outflow pressure gradient by the provocation, operation would be considered even though the gradient at rest is less than 50 mmHg.

Adolescent↗