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Biomedical subjects

Y Ohba

Publications and source records attributed to Y Ohba.

At least 271 records · Page 15Linked to original sources
PubMed1982

Urea polyacrylamide gel electrophoresis of PCMB precipitate as a sensitive test for the detection of the unstable hemoglobin subunit.

A sensitive test for the detection of the abnormal subunit of unstable hemoglobins is described. The unstable hemoglobin subunit was selectively precipitated by paramercuribenzoic acid treatment of the carboxy hemolysate, and the precipitate was studied by urea polyacrylamide gel electrophoresis for globin composition. The test enabled the detection of an electrophoretically silent, alpha-chain unstable variant comprising only 1% of total hemoglobin. Other applications included the demonstration of Hb Köln in a cord blood, and the detection and purification of very slightly unstable hemoglobin variants.

Chemical Precipitation↗
PubMed1982

First Japanese family with the unstable hemoglobin Zürich [beta 63(e7) His leads to Arg].

Abnormal hemoglobin, which was latter identified as hemoglobin Zürich, was discovered in a 45-year-old female with severe valvular heart disease, congestive heart failure and moderate anemia and hyperbilirubinemia. Same abnormal hemoglobin was demonstrated in her two apparently healthy sons. This is the first reported family of hemoglobin Zürich in Japan.

Adolescent↗
PubMed1981

The reassociation with chromatin of H1 fragments bisected with thrombin.

When fragments of H1 histone formed by bisection of H1 histone with thrombin were allowed to reassociate with H1 histone-depleted chromatin, the carboxyl-terminal segment reassociated in such a manner as to protect the micrococcal nuclease-sensitive site(s) of the nucleosome core. On the other hand, the NH2-terminal segment of H1 histone protected 20 base pairs of linker DNA adjacent to the nucleosome core particle. These data provide strong evidence that the NH2-terminal portion and the carboxyl-terminal portion of H1 histone interact with 20 base pairs of linker DNA and the core DNA of the nucleosome, respectively.

Animals↗
PubMed1981

Serum glutathione S-transferase in experimental liver damage in rats.

The changes of serum glutathione S-transferase (GST) was observed after carbon tetrachloride (CCl4) administration to Wistar rats. Serum GST activity increased rapidly and reached the peak 24 hours after CCl4 administration, and decreased rapidly thereafter. Centrilobular massive necrosis was already observed at the peak time of serum GST activity. On the other hand, serum glutamic oxaloacetic transaminase (GOT) and glutamic pyruvic transaminase (GPT) activities varied slowly, and the peak time of GOT and GPT activities was 36 hours after CCl4 administration. GST-containing Y fraction obtained from rat liver was injected intravenously to control and nephrectomized rats, and the plasma disappearance of GST activity was observed. The plasma disappearance of GST activity was very rapid in the control rats. When the Y fraction obtained from 1/12 g liver was injected, no statistically significant difference in the plasma GST half lives was observed between the control and nephrectomized rats. Half life of serum GST was significantly shorter in control rats receiving the Y fraction from 1/60 g liver, comparing with that in nephrectomized rats receiving the same amount of Y fraction. From these results, serum GST is concluded to be a precise index of the early stage of hepatic necrosis in the rat, and considerable amount of GST is excreted from the kidneys, but most of the enzyme is metabolized in vivo.

Alanine Transaminase↗
PubMed1981

Erythrocyte osmotic fragility in various liver diseases--application of coil planet centrifuge system.

A change in erythrocyte osmotic fragility was observed on various liver diseases by means of the coil planet centrifuge (CPC) system, and the relationship between changes in it and in serum lipids was studied. According to the CPC classification of hemolytic patterns of L, M, T and R, the frequency of appearance of T and R increased in liver cirrhosis and primary hepatoma. Hemolytic start and end points both changed considerably in primary hepatoma, acute hepatitis and liver cirrhosis. Change of hemolytic end point which shifted to the hypotonic side is more prominent than that of hemolytic start point. The hemolytic end point showed an inverse correlation to serum alkaline phosphatase and LAP, and correlation to pseudocholinesterase and albumin. Among the relations of red cell fragility and lipids of the lipoprotein fractions, free cholesterol and the ratio of free cholesterol to phospholipid in high density lipoprotein were both in remarkable inverse correlation to the hemolytic end point. Free cholesterol in high density lipoprotein was concluded one of the most important determinants of erythrocyte osmotic fragility.

Acute Disease↗