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Biomedical subjects

Y Tsuchida

Publications and source records attributed to Y Tsuchida.

At least 217 records · Page 12Linked to original sources
PubMed1981

Congenital esophageal stenosis due to tracheobronchial remnants and its associated anomalies.

Two cases of congenital esophageal stenosis due to tracheobronchial remnants are reported, one accompanied by anovestibular fistula and the other by microphthalmos with iris coloboma. A survey of congenital esophageal stenosis due to tracheobronchial remnants in Japan revealed that the incidence of associated anomalies in this lesion is 17.3% This value is significantly lower than that reported for esophageal atresia. Our analysis showed that esophageal atresia is the most frequently associated anomaly, followed by anorectal abnormalities. Cardiovascular anomalies are very uncommon. Embryology relating to this subject is discussed.

Bronchi↗
PubMed1981

The delay phenomenon in types of deltopectoral flap studied by xenon-133.

We have investigated the hemodynamic mechanisms of delay phenomenon of various types of deltopectoral flaps and optimal time for transfer after delay operation using the local clearance method of Xenon-133. Characteristic differences were observed in recovery patterns of the distal blood flow among five types of delay procedure the results obtained are reported. In Group 1 (U-shaped, raised deltopectoral flap), two types of recovery patterns (fast and slow) were obtained. In cases of faster recovery, the optimal transfer time after delay is considered to be almost 10 days. In cases of slow recover in groups I and II (U-shaped, raised deltoid flap), the optimal time for transfer is thought to be 2 to 3 weeks. In group III (deltopectoral flap lined with a split-skin graft) and group IV (tubed, raised deltopectoral flap), a faster recovery pattern was observed than in groups I and II, and the optimum transfer time is considered to be about 7 to 14 days after delay operation. Accordingly, the use of groups III and IV would be highly recommended instead of group I. In group V (bipedicled, raised deltopectoral flap), the time of lateral incision was found to be critical.

Hemodynamics↗
PubMed1980

alpha-Fetoprotein and other serum proteins synthesized by endodermal sinus tumor transplanted into nude mice.

The human yolk sac is said to synthesize not only alpha-fetoprotein but also other serum proteins, i.e., albumin, prealbumin, alpha 1-antitrypsin, and transferrin. Two endodermal sinus tumors (yolk sac tumors) were successfully transplanted into athymic nude mice. Concentration of these human serum proteins in the sera of the nude mice and tumor extracts was determined quantitatively by electro-immunodiffusion and radioimmunoassay. alpha-Fetoprotein and albumin were detected in one case, and alpha 1-antitrypsin and alpha-fetoprotein in the other. In the former case, the amount of alpha-fetoprotein synthesized was larger than that of albumin, whereas the amount of alpha-fetoprotein was smaller than that of alpha 1-antitrypsin in the latter. It is tempting to consider that human endodermal sinus tumors simulate the human yolk sac functionally, but the pattern of protein synthesis may differ from case to case.

Animals↗
PubMed1980

Alpha-fetoprotein in infantile obstructive jaundice in comparison with the normal ranges.

In an attempt to study the diagnostic value of alpha-fetoprotein (AFP), serum AFP concentrations were measured by radioimmunoassay in 34 neonates and infants with obstructive hepatobiliary diseases and the results were compared with the normal ranges of AFP at this age. Eighteen of 24 infants with biliary atresia and four of six infants with neonatal hepatitis had raised AFP values. In only one of four infants with choledochal cyst, did the AFP value exceed the normal range. In 10 older children with this lesion, AFP was normal. Serum AFP concentrations in biliary atresia did not correlate with the serum bilirubin, s-GOT, s-GPT, anatomic type of the lesion or postoperative bile flow. From these observations, it would appear that the elevation of AFP in infantile cholestasis is unrelated to underlying diseases except in case of alpha 1-antitrypsin deficiency. Serum AFP concentrations in neonates with physiological jaundice, were seldom elevated, and showed a good correlation with serum levels of total bilirubin. Possible mechanisms causing this elevation of AFP may be different from those involved in infantile cholestasis.

Aging↗
PubMed1979

Rate of skin blood flow in various regions of the body.

Skin blood flow was measured by local clearance of 133Xe, and skin temperature was measured by medical thermography in various parts of the body. 1. A significant linear decrease in skin blood flow was observed with increasing age in the deltoid region. 2. The skin blood flow in the facial and pectoral areas was considerably higher than in the deltoid region. 3. The skin blood flow in the posterior cervical, lateral thoracic, lateral abdominal, and gluteal sites was less than in the deltoid region.

Abdomen↗
PubMed1979

Human endodermal sinus tumour in nude mice and its markers for diagnosis and management.

Two human endodermal sinus tumours (yolk sac tumours) were transplanted successfully into nude mice. The transplanted tumours maintained not only morphological characters, such as Schiller-Duval bodies, but also the ability to synthesise alpha-fetoprotein, lactic dehydrogenase 1, liver and bone type alkaline phosphatase, and some human serum proteins. Since these tumours produced lactic dehydrogenase 1 but not the other four isozymes of lactic dehydrogenase, this isozyme, like alpha-fetoprotein, seems to be a good marker for the diagnosis and management of cases of endodermal sinus tumour. One of the two tumours produced another fetal antigen or carcinoembryonic antigen in addition to alpha-fetoprotein. These two endodermal sinus tumours, with their various markers in nude mice, will be useful in studies on diagnostic markers.

Alkaline Phosphatase↗
PubMed1978

Evaluation of alpha-fetoprotein in early infancy.

Serum AFP concentrations of normal subjects were statistically analyzed in order to obtain the normal ranges in early infancy. The 95% prediction band would seem to offer a convenient means of evaluating serum AFP in the age range 0-300 days of life. Some illustrative cases, whose AFP values were formerly considered to be abnormally high but later proved to be within normal range, are presented.

Adolescent↗
PubMed1978

Alpha-fetoprotein, prealbumin, albumin, alpha-1-antitrypsin and transferrin as diagnostic and therapeutic markers for endodermal sinus tumors.

According to Gitlin, alpha-fetoprotein (AFP), albumin, prealbumin, alpha-1-antitrypsin and transferrin are normal products of the human yolk sac. They are expected to reappear in human endodermal sinus tumor (yolk sac tumor). The synthesis of alpha-fetoprotein and other serum proteins by human endodermal sinus tumor was studied in the culture cells and in the tumor tissue transplanted into nude mice. The results gave evidences of synthesis of some of these proteins including alpha-fetoprotein and alpha-1-antitrypsin. Serum concentrations of these proteins were studied in eight children having endodermal sinus tumors. Serum AFP levels were abnormally high in all cases, whereas concentrations of other serum proteins were almost within normal ranges. This might be simply reflected by the fact that pre-albumin, albumin, alpha-1-antitrypsin, and transferrin are already present in large quantities in sera of normal subjects while alpha-fetoprotein is present only in a negligible quantity. Alpha-fetoprotein, as a diagnostic and therapeutic marker of endodermal sinus tumor, showed good correlation to the tumor growth. Serum AFP concentrations declined almost to 0 ng/ml with a half-life of 4 days when surgical removal was complete, whereas serum AFP decreased only to 100-200 ng/ml with radiation and chemotherapy alone.

Adolescent↗
PubMed1978

Purification and some properties of three forms of glucoamylase from a Rhizopus species.

1. Three forms of glucoamylase [EC 3.2.1.3] were simultaneously purified from a Rhizopus species by (NH4)2SO4 fractionation and successive chromatographies on Sephadex G-75, DEAE-Sephadex, and CM-Sephadex, and were finally separated from each other by means of recycling chromatography on Bio-Gel P-150. The purification achieved was 3--4 fold from crude extract with respect to each glucoamylase; the yields of the three glucoamylases, designated as Gluc1, Gluc2, and Gluc3 in order of content, were 39, 7, and 0.4%, respectively. All the purified enzymes were homogeneous in polyacrylamide gel electrophoresis, isoelectric focusing, and ultracentrifugation. 2. The three glucoamylases were glycoproteins differing in both amino acid composition and carbohydrate content, but showed a common antigenicity in immunodiffusion. The molecular weights of Gluc1, Gluc2, and Gluc3 were estimated to be 74,000, 58,600, and 61,400, respectively, by sedimentation equilibrium and these values were verified by SDS-polyacrylamide gel electrophoresis. The specific activities of the three enzymes toward starch were in the opposite order to their molecular weights. 3. The three glucoamylases had the same broad pH optima in the range pH 4.5--5.0 and shared a common susceptibility to inactivation by heat, extreme pH, and such divalent cations as Hg2+, Pb2+, and Mn2+, indicating close similarity in enzymatic properties.

Amino Acids↗
PubMed1978

Measurement of skin blood flow in delayed deltopectoral flaps, using local clearance of 133Xenon.

A study was made to determine the skin blood flow at the deltoid region in 89 cases, and the regional blood flow of delayed deltopectoral flaps, using the local clearance of 133Xe. The change in the skin blood flow, before and after a delay procedure of the deltopectoral flap, was measured in 27 patients--and the following results were obtained. (1) There was a linear tendency to a decreasing flow, one found to be statistically significant, with increasing age of the patient. (2) A significant correlation was found between the skin blood flow and the blood flow of the subcutaneous tissue. (3) The blood flow after we raised one side of a deltopectoral flap and lined it with a split-skin graft was higher than that found after a U-shaped undermining and not lining a flap. (4) The rate of successful transfer of a deltopectoral flap was found to be low when the 133Xe clearance rate was less than 0.07.

Blood Flow Velocity↗