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Biomedical subjects

M Oya

Publications and source records attributed to M Oya.

At least 163 records · Page 9Linked to original sources
PubMed1985

Polymorphism of placental phosphoglucomutase in Japanese.

Polymorphism of PGM1 and PGM3 types was investigated in placental extracts from 127 unrelated Japanese parturients living in Yamanashi Prefecture. The gene frequencies were 0.787 for PGM1(1), 0.213 for PGM1(2); 0.760 for PGM13, 0.240 for PGM3(2), respectively. There was no significant association between the PGM1 and PGM3 systems. The PGM3(2) frequency in the present sample population was higher than those in Kanto District, but lower than those in Kinki District.

Electrophoresis, Starch Gel↗
PubMed1985

Identification of fetal bloodstains by enzyme-linked immunosorbent assay for human alpha-fetoprotein.

A rapid and highly sensitive enzyme-linked immunosorbent assay (ELISA) for determination of human alpha-fetoprotein (AFP) using commercially available reagents was devised and applied to identification of fetal bloodstains. When experimentally prepared bloodstains, 1 by 2 mm in area, were submitted to analysis, only fetal bloodstains showed positive reactions in the present ELISA. The reactions did not change significantly when these bloodstains were stored at room temperature for one week. The present ELISA seems to be suitable for forensic science practice.

Adult↗
PubMed1984

Immunologic characterization of human seminal leucine aminopeptidase (LAP) and its medicolegal use.

A new method for identification of seminal stains is described, based on the immunologic demonstration of leucine aminopeptidase (LAP), which is extremely abundant in human semen and specific for the prostate as well as semen. An antiserum against human seminal plasma was obtained by repeated immunization of rabbits with seminal plasma and Freund's adjuvant. Ouchterlony's double immunodiffusion test and Culliford's precipitin electrophoresis were performed to demonstrate specific proteins of seminal plasma. LAP activity was visualized with L-leucyl-beta-naphthylamide as substrate and with Fast Garnet GBC as coupler. The immunologic analysis of LAP produced two precipitin lines with enzyme activity. One was observed in kidney, jejunum, pancreas, prostate, as well as in semen, and was completely absorbed with kidney homogenates. The other was found only in semen and the prostate and was not absorbed with kidney homogenates. When the anti-seminal plasma serum absorbed with the kidney was used, the semen-specific LAP could be demonstrated by precipitin electrophoresis only in seminal stains stored for up to 2 months, whereas it was not demonstrated in stains from other human body fluids. By means of precipitin electrophoresis the detection of the semen-specific LAP was possible at semen dilutions of up to 1:32. The method described here greatly enhances the value of semen identification and is quite recommendable for the examination of stains in medico-legal practice.

Body Fluids↗
PubMed1984

A stability study on Gc subtyping in bloodstains: comparison by two different techniques.

The limits of determination of Gc subtypes in bloodstains were compared between the immunofixation method and the sulfosalicylic acid precipitation method using isoelectric focusing on polyacrylamide gel. By the immunofixation method Gc subtyping in bloodstains was successfully made at 37 degrees C after 7 weeks, at room temperature after 17 weeks and at 4 degrees C even after 25 weeks storage. By the sulfosalicylic method Gc subtypes were no longer able to be determined a few weeks after stain formation. The superiority of the results obtained by the immunofixation method makes it the recommended method for the Gc subtyping from bloodstains in medicolegal practice.

Benzenesulfonates↗
PubMed1984

Detection of thyroglobulin in blood stains as an aid in the diagnosis of mechanical asphyxia.

Mechanical forces applied to the neck region are known to release certain amounts of thyroglobulin into circulation. In this experiment, an attempt was made to detect thyroglobulin in bloodstains as an aid in the diagnosis of mechanical asphyxia. Experimental bloodstains containing thyroglobulin at concentrations of 1, 2, 5 and 10 mu g/mL were prepared on a sheet of filter paper. Small pieces of bloodstains, measuring approximately 2.4 cm2 in area, were extracted with 0.1 mL of distilled water and the extracts were tested against an antihuman thyroglobulin serum by precipitation-electrophoresis. Bloodstains containing more than 1 mu g/mL of thyroglobulin formed distinct precipitin lines for up to one month of storage, while bloodstains containing more than 5 mu g/mL of thyroglobulin formed distinct precipitin lines for up to three months of storage. The present results suggest that the bloodstains can be utilized in the diagnosis of mechanical asphyxia.

Asphyxia↗
PubMed1983

A new reagent for the rapid determination of total hemoglobin as hemiglobincyanide in blood containing carboxyhemoglobin.

Kinetics of conversion of HbCO to HiCN with various K3Fe(CN)6-KCN reagents was examined photometrically. Complete conversion of HbCO to HiCN required about 8 hr, 150 min, and 50 min with Drabkin's reagent, that of van Kampen and Zijlstra, and that of Taylor and Miller, respectively. The absorbance at 540 nm was stabilized practically in 5 min even in CO-saturated blood when a reagent containing a 1600-fold excess of K3Fe(CN)6 to Hb iron was used. A slight increase in the absorbance was observed around 504 nm in the HiCN solution produced with the reagent. The absorbance at 540 nm in the solution, however, was stable until at least 120 min after mixing. From these findings, a reagent containing a 1600-fold excess of K3Fe(CN)6 to Hb iron and an incubation time of 5 min were used for the complete conversion of HbCO to HiCN. The stabilization of the absorbance at 540 nm was often prolonged to 10 min when the reagent was stored over 2 weeks. The reagent was compared with two other reagents, using 20 blood samples containing various amounts of HbCO, and proved to be suitable for the determination of total Hb in blood containing elevated HbCO as well as in ordinary blood.

Carboxyhemoglobin↗
PubMed1982

A simple and accurate method for measurement of the hemoglobin content in blood by colorimetric iron determination.

A simple and accurate determination of iron in blood involving acid digestion in a heating block is described. The digestion requires little attention and permits the handling of large numbers of samples. The diluted digest is used for the colorimetric determination of iron using o-phenanthroline, and the equivalent hemoglobin in blood is calculated. There was a good correlation between the results of the present method and the cyanmethemoglobin method with 21 standard blood samples containing 4.9-26.8 g/dl of hemoglobin.

Adult↗
PubMed1982

A new enzymatic method for quantitation of spermine in human semen.

A new enzymatic method for the quantitation of spermine in human semen, based on the specific reaction of barley seedling polyamine oxidase with spermine, is described. Small amounts of human semen were incubated with the polyamine oxidase; hydrogen peroxide formed in the oxidase reaction was measured photometrically by coupling 4-aminoantipyrine with N-ethyl-N-(3-methylphenyl)-N'-acetylethylenediamine in the presence of peroxidase. The detection limit of spermine of this method was about 10 nmol per tube. The mean level of spermine in human semen was 2.41 mumol/ml; the levels in vaginal fluid, saliva, serum, and urine were below the detectable limit by this procedure.

Humans↗