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Biomedical subjects

M Chiba

Publications and source records attributed to M Chiba.

At least 415 records · Page 23Linked to original sources
PubMed1978

Experimental colitis in rabbits.

Experimental colitis was induced in rabbits either by immunizing the antigens which possess the cross-reacting antigenicity with colonic mucosa, and by infusing intravenously their own lymphocytes sensitized with E. coli 014 endotoxin which may contain a high concentration of common antigen (Kunin antigen). The hemorrhagic inflammatory changes were developed in the colon as follows; (1) three of fifteen rabbits immunized with rat colon, (2) one of three rabbits with their own E. coli, (3) six of fifteen rabbits with E. coli 014 and, (4) five of eight rabbits by infusing their own lymphocytes sensitized with E. coli 014 endotoxin. It was suggested that the cross-reacting antigenicity with the colonic mucosa and the sensitized lymphocytes implicate in the pathogenesis of chronic ulcerative colitis.

Animals↗
PubMed1978

Effect of caerulein upon insulin and glucagon secretion in dogs.

In order to investigate the action of caerulein upon insulin and glucagon secretion, experimental studies were carried out using anesthetized dogs, in which graded doses of caerulein were infused into the pancreatic artery, and insulin and glucagon were measured in the blood obtained from the pancreatic vein. When caerulein was administered at a rate of 15 ng/min, neigher changes of blood glucose in the femoral artery nor plasma levels of insulin or glucagon in the pancreatic vein were prominent. Caerulein infusion at a rate of 120, 240 or 480 ng/min caused a prompt rise of plasma insulin and a delayed increase of plasma glucagon in the pancreatin vein. Blood glucose in the femoral artery increased only with caerulein doses of 240 ng/min or more. A significant increase in pancreatic vein blood flow rate was demonstrated after the infusion of caerulein at a rate of 240 ng/min or more. Neither caerulein-induced insulin secretion nor glucagon secretion was influenced by a simultaneous infusion of glucose. In contrast, caerulein-induced glucagon secretion was exaggreated by a simultaneous arginine infusion. It was concluded from the present experiments that caerulein infusion into the pancreatic artery resulted in increased secretion of insulin and glucagon from the pancreas.

Animals↗
PubMed1978

Septicemia caused by Klebsiella oxytoca.

Klebsiella oxytoca was isolated from the blood of a leukemic patient. The typical pathogenicity of Klebsiella oxytoca was observed in the patient. The pathogenicity of several Klebsiella oxytoca strains isolated from blood, urine and sputum of different patients was examined in mice, and it was found that Klebsiella oxytoca isolated from the blood had a higher toxicity than the others.

Adolescent↗
PubMed1977

pH and the activity of porphobilinogen synthase in human blood.

For determination of the activity of this enzyme (EC 4.2.1.24) in blood, pH dependency was evaluated by using whole blood and washed erythrocytes. The effects of assay methods, original and final pH, and use of sodium or potassium phosphate buffer were examined. The pattern of pH dependency differed for whole blood and washed erythrocytes, whether blood from normal or lead-exposed subjects was examined. The pH optimum for the activity in erythrocytes from lead-exposed subjects was the same as for the normal persons if the concentration of lead in blood did not exceed 80 microgram/100 g of whole blood. Hemolyzing blood by placing it on solid CO2 decreases the activity.

Erythrocytes↗