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Biomedical subjects

N Kuwahara

Publications and source records attributed to N Kuwahara.

At least 37 records · Page 2Linked to original sources
PubMed1993

Autoradiographic analysis of (14C-methyl)-L-methionine uptake in transplanted rat brain tumors.

To elucidate metabolic pathways of methionine in brain tumors, we studied autoradiographic images of (14C-methyl)-L-methionine (14C-Met) in transplanted rat brain tumors. 14C-Met accumulated in the tumor almost twice as much as in the gray matter 90 min after injection. The acid-insoluble fraction, which was bound to macromolecules, comprised 84% the total count of the accumulated tracers in the tumor. Analysis of 14C-Met tracer accumulation is informative for understanding amino acid metabolism in brain tumors.

Animals↗
PubMed1992

Acceptor specificity of cyclodextrin glycosyltransferase from Bacillus stearothermophilus and synthesis of alpha-D-glucosyl O-beta-D-galactosyl-(1----4)-beta-D-glucoside.

Bacillus stearothermophilus CGTase had a wider acceptor specificity than Bacillus macerans CGTase did and produced large amounts of transfer products of various acceptors such as D-galactose, D-mannose, D-fructose, D- and L-arabinose, D- and L-fucose, L-rhamnose, D-glucosamine, and lactose, which were inefficient acceptors for B. macerans CGTase. The main component of the smallest transfer products of lactose was assumed to be alpha-D-glucosyl O-beta-D-galactosyl-(1----4)-beta-D-glucoside.

Bacillus↗
PubMed1988

Multiple-dose pharmacokinetics of nilvadipine in healthy volunteers.

Nilvadipine, a new antihypertensive and antianginal drug, was studied in six healthy male volunteers to evaluate its steady-state pharmacokinetics after oral dosing. The subjects were given a single dose of 4 mg, followed by 4 mg every 12 hours for six days after a washout period of more than 3 days. The pharmacokinetics of nilvadipine were well described by a linear model of triexponential equation with zero-order absorption. The steady state was reached by the fourth day of multiple dosing, with a twofold accumulation of trough plasma concentration and no accumulation of peak concentration. The mean plasma concentration at steady state was 1.0 ng/mL. The optical enantiomers of nilvadipine were also determined in the plasma. The plasma concentration of (+)-nilvadipine was about two and a half times higher than that of (-)-nilvadipine, and this ratio was unaffected by multiple dosing.

Administration, Oral↗
PubMed1986

Coronary arterial lesions of Kawasaki disease: cardiac catheterization findings of 1100 cases.

In our institute, 1100 patients with a history of Kawasaki disease have been catheterized for selective coronary arteriography. Their age at examination ranged from four months to 13 years. Coronary artery lesions (CAL) were found in 262 patients. As far as the type of the CAL was concerned, occlusion was noted in 20 (7.6%), segmental stenosis in 15 (5.7%), localized stenosis in 62 (23.7%), aneurysm in 93 (35.5%), and dilatation in 72 patients (27.5%). In terms of the total number of lesions, there were 23 occlusions, 19 segmental stenoses, 109 localized stenoses, 449 aneurysms and 307 dilatations. The 262 patients with CAL were analyzed according to the interval from the onset to the time of selective coronary arteriography. The incidence of both occlusion and segmental stenosis was lowest in the group who were catheterized shortly after the onset of disease, whereas the prevalence of aneurysm was highest in this group. But the prevalence of dilatation was highest in the group of patients who were catheterized late. A total of 12 patients had to undergo femoral arterial thrombectomy for arterial thrombosis following the catheterization, but no other major complication was experienced.

Biopsy↗