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Biomedical subjects

T Iida

Publications and source records attributed to T Iida.

At least 433 records · Page 24Linked to original sources
PubMed1985

Detection of circulating antigens in sera of rabbits infected with Toxoplasma gondii.

Experiments were performed to investigate the usefulness of an enzyme-linked immunosorbent assay utilizing avidin-biotin interaction as a diagnostic tool for detection of Toxoplasma antigen in blood. The lower limit of sensitivity of the assay by this method was ca. 4 ng/ml, and standard assays provided a linear plot of antigen concentration over a range up to 250 ng/ml. In rabbits inoculated subcutaneously with trophozoites of the RH strain, Toxoplasma antigen became demonstrable in the circulation 3 days after injection, before emergence of antibody in serum and development of parasitemia. Analysis of the antigen in serum from infected rabbits by high-permeation liquid gel chromatography suggested the occurrence of antigens of four different molecular weights, greater than or equal to 400,000, 220,000, 130,000, and 45,000. Of these antigens, those of molecular weights 220,000 and 130,000 showed a conspicuous elevation with time after infection.

Animals↗
PubMed1985

Accumulation, excretion and effects on hepatic enzymes of polychlorinated quaterphenyl congeners in rats.

Six skeletal congeners of polychlorinated quaterphenyls (PCQs), namely polychlorinated o-quaterphenyl (2,2'-PCQ), 2,3'-diphenylbiphenyl (2,3'-PCQ), 2,4'-diphenylbiphenyl (2,4'-PCQ), m-quaterphenyl (3,3'-PCQ), 3,4'-diphenylbiphenyl (3,4'-PCQ) and p-quaterphenyl (4,4'-PCQ), were orally administered to Wistar rats at a dose of 10 mg/rat. On the 5th day after administration of PCQs, the rats were examined for accumulation of PCQ congeners, hepatic enzyme activities and organ weight changes. Accumulation of 3,3'-PCQ, 3,4'-PCQ and 4,4'-PCQ were 1.5-3.2% of dose in the liver, while those of 2,2'-PCQ, 2,3'-PCQ and 2,4'-PCQ were only 0.1 to 0.2%. The amount of 4,4'-PCQ accumulated in the mesenteric adipose tissue, 20 micrograms/rat, was much higher than those of other PCQ congeners. Large amounts of the PCQ congeners administered were excreted in the feces on the first day, accounting for 96 to 98% of dose for 2,2'-PCQ and 4,4'-PCQ, and 55 to 75% for the other PCQ congeners, and the daily excretions of PCQs after the second day were very small, less than 10% of the dose. Benzo [a] pyrene 3-hydroxylase activity was significantly depressed by the treatment with 3,3'-PCQ, 3,4'-PCQ and 4,4'-PCQ, contrasting to the toxic congeners of polychlorinated biphenyls and dibenzofurans which enhanced markedly this enzyme activity. DT-Diaphorase activity was also depressed by the treatment with 2,3'-PCQ, 2,4'-PCQ and 3,4'-PCQ. Significant atrophy of the thymus was observed by the treatment with 4,4'-PCQ.

Adipose Tissue↗
PubMed1985

Potential bile acid metabolites. 9. 3,12-Dihydroxy- and 12 beta-hydroxy-5 alpha-cholanoic acids.

Syntheses of the heretofore unreported 3 alpha, 12 beta-, 3 beta, 12 beta-dihydroxy-, and 12 beta-hydroxy-5 alpha-cholanic acids of the 5 alpha-series, their methyl esters, and some related derivatives are described. In addition, allodeoxycholic (3 alpha, 12 alpha-dihydroxy) acid was prepared by a new route. The principal reactions involved were the stereoselective reduction of C-12 ketones with an amino-borane reagent and of a C-3 ketone with K-Selectride, and inversion of a 3 beta-tosylate derivative with N,N-dimethylformamide.

Bile Acids and Salts↗
PubMed1984

Changes of ground substance in the inner ear in alloxan diabetic mice.

One of the important substances in the ground substance is acidic glycosaminoglycans (AGAGs). Changes of AGAGs in the inner ear and in other organs were investigated using alloxan diabetic mice in order to contribute to the understanding of diabetic hearing impairment. In the diabetic group, gradual increases of AGAGs were observed in each tissue. On the 60th day after alloxan injection, AGAG values were increased 3.5-fold in the cochlea, 2.5-fold in the brain, 13-fold in the liver, twofold in the kidney, and fivefold in the pancreas compared with the control values. It is interesting to note that both the cochlea and pancreas showed continuous increases of AGAGs.

Animals↗
PubMed1984

Tick bite: two cases studied by scanning electron microscopy.

The attachment of ticks to human skin has been studied by scanning electron microscopy. Intact specimens of Ixodes ovatus and Ixodes persulcatus were examined, and we also studied the skin of two patients who had been bitten by these two species. In the first case, the remains of the tick were visible and a homogeneous cement-like substance was observed on the dorsal hypostome and in the dermis, suggesting that the tick attaches itself to the host skin by a secretion. In the second case, the apices of some denticles of the hypostome were chipped. Two months later, the skin which the tick had attacked was biopsied and yellowish-brown particles, probably derived from the denticles, were seen in foreign body giant cells in the dermis.

Adolescent↗
PubMed1984

Biosynthesis of astromicin and related antibiotics. I. Biosynthetic studies by bioconversion experiments.

Biosynthesis of astromicin, a unique pseudodisaccharide aminoglycoside antibiotic containing 1,4-diaminocyclitol component, was investigated by isolating a variety of possible precursor compounds from mutants of Micromonospora olivasterospora in which biosynthetic pathways for astromicin were blocked. Washed mycelia of M. olivasterospora mutants converted these compounds to astromicin, which was detected by thin-layer chromatography. Since astromicin possesses one glycyl and three methyl groups, [14C]glycine and [14C]methionine should be incorporated into precursors to form astromicin. To confirm the biosynthetic pathway, formation of labeled astromicin from the precursors was examined using [1-14C]-glycine or [methyl-14C]methionine. From above results, we propose the biosynthetic pathway for astromicin as shown in Fig. 2.

Aminoglycosides↗