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Biomedical subjects

K Ueda

Publications and source records attributed to K Ueda.

At least 1,657 records · Page 92Linked to original sources
PubMed1978

Effect of ultraviolet or laser light irradiation on the growth of Micrasterias thomasiana.

The effect of ultraviolet on laser light on growth of lobes in a green alga, Micrasterias thomasiana was investigated. During plasmolysis, the cell wall and the outermost region of the cytoplasm were separately irradiated with an ultraviolet or laser microbeam. Growth of the lobes was more effectively inhibited by irradiation of the cytoplasm than of the cell wall when the dose of irradiation was weak. Growth inhibition was observed in the irradiated cytoplasm where no apparent decrease in velocity of plasma streaming was seen, which suggested that irradiation caused more damage to the mechanism of exocytosis than to the migration of secretion vesicles. Strong irradiation resulted in gelatinization of the cytoplasm. With strong doses of irradiation on both the cytoplasm and cell wall, growth was completely inhibited.

Cell Wall↗
PubMed1978

A clinicopathological study on pericardial heart disease in the aged.

A total of 87 cases of pericardial heart disease (73 of pericarditis and 14 of hemopericardium) among 870 consecutive autopsies of aged patients was studied. Fibrinofibrouspericarditis was found in 80.8% of pericarditis, neoplastic in 13.7% and purulent in 5.5%. Representative cases of each type of pericarditis were illustrated. Among fibrinofibrous pericarditis, idiopathic was the most common and the other causes included irradiation, myocardial infarction, renal failure, rheumatoid arthritis and hypothyroidism. Frequent association of congestive heart failure or anasarca with mild to moderate fibrinofibrous pericarditis was noted. Clinical and morphologic evidences of pulmonary tuberculosis were present in nearly one third of cases with fibrinofibrious pericarditis, but actual incidence of tuberculous pericarditis could not be determined. Incidence of clinical signs and symptoms of acute pericarditis was evaluated with the stress on the relatively high incidence of supraventricular tachyarrhythmias, especially in cases with histological evidence of sinus node involvement in aged cases.

Aged↗
PubMed1978

A study on the effects of nifedipine in hypertensive crises and severe hypertension.

Ten mg of Nifedipine, a Ca++ antagonist, was administered orally in 2 groups of patients; Group 1: 6 patients in hypertensive emergency and Group II: 12 patients with intractable, severe hypertension. Following results were obtained. 1) A marked hypotensive effect was observed in all patients of Group I. The maximum effect was observed within 30 to 60 min and lasted for approximately 180 min. Clinical symptoms also improved remarkably with the fall in blood pressure. Any side effect was not observed. 2) A marked hypotensive effect was observed in all cases of Group II. The blood pressure fell by 21.4% systolic (p less than 0.01) and 19.4% diastolic (p less than 0.02). The peripheral vascular resistance also showed the decrease by 26.2% (p less than 0.01). The heart rate and cardiac index increased slightly. It was suggested that the hypotensive mechanism of this preparation is due primarily to the peripheral vasodilation.

Adult↗
PubMed1978

Three cases of sinoatrial block induced by anticonvulsants.

Diphenylhydantoin (DPH) and Carbamazepine have been widely used as anticonvulsants and known to have antiarrhythmic properties. Previous reports have shown that arrhythmias such as sinus bradycardia and atrioventricular block can be induced by these agents. In this paper, sinoatrial block (SA block) induced by these agents which were used as anticonvulsants in 3 aged patients is reported. Thre patients, 2 women and 1 man, were over 60 years old. In 2 cases, administration of DPH for recurrent epileptic seizures was followed by SA block. After withdrawal of DPH, SA block disappeared, but resumption of DPH resulted in SA block again. In 1 of these 2 patients, overdrive suppression test revealed normal sinus node recovery time. In the third patient, in addition to DPH which was administered for epileptic seizures, Carbamazepine was given for shoulder pain, then SA block occurred. Withdrawal of these agents restored normal sinus rhythm and combined administration of these 2 agents again induced SA block. Autopsy revealed decreased conduction cells in the sinus node.

Aged↗
PubMed1978

Sinoatrial response to premature atrial stimulation during atrial pacing in aged patients with and without sinus node dysfunction.

Sinus node function was analysed in 15 aged patients, including 8 with sick sinus syndrome and 7 without apparent sinus node dysfunction, by rapid artial pacing and premature atrial stimulation during sinus rhythm and 5 beats of atrial pacing. Three patterns of sinoatrial response were identified by premature atrial stimulation during atrial pacing. Type I response (3 cases) represented approximately constant return cycles and type II (2 cases) represented a markedly prolonged return cycles following premature stimulation. Type III response was characterized by a progressive shortening of return cycles as the prematurity of atrial extrastimuli was increased. Underlying mechanisms responsible for these responses were discussed in relation to the sinus node automaticity and sinoatrial conduction.

Aged↗
PubMed1978

Levels of erythrocyte superoxide dismutase activity in Japanese people.

Levels of erythrocyte superoxide dismutase (SOD) activitiy in a sample of Japanese people were determined. Blood samples were taken from new-born infants, preschool children, young and old people who had no apparent diseases and also from three anemic patients. Erythrocyte SOD activities in different age groups had a nearly normal distribution. Females had slightly lower activities than males, although the difference was statistically insignificant. The distributions of SOD activities were 12.6 +/- 2.7 (m +/- SD) unit/mg Hb in young people and 11.4 +/- 3.0 in old people, indicating that erythrocyte SOD activity falls with aging. Because of low concentration of hemoglobin, SOD activities of old people expressed as unit/ml blood were much lower than in young people. Three anemic patients had slightly lower SOD activity (unit/mg Gb), but the difference was not significant.

Adult↗
PubMed1978

Sliding osteotomy in the mandibular body for correction of prognathism.

To overcome some of the disadvantages of the mandibular body ostectomy, a sliding osteotomy accomplished by parallel sectionings of the mandible in the regions of the first premolars was used for the treatment of mandibular prognathism in two cases. The osteotomy was performed by an intraoral approach without any damage to the contents of the mental foramen. The anterior segment could be moved back to any desirable position without losing optimum bony contact. An adequate blood supply to the anterior segment was maintained by a large area of periosteal attachment on the lingual side. The method is effective for correction of mandibular prognathism in which a good occlusion cannot be expected by a ramus osteotomy.

Adolescent↗