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Biomedical subjects

K Joh

Publications and source records attributed to K Joh.

113 records · Page 7Linked to original sources
PubMed1983

Coarctation of the aorta in early infancy. Left ventricular outflow tract obstruction and its clinical implications.

In order to clarify the clinical significance of left ventricular outflow tract obstruction, 11 infants with coarctation of the aorta and ventricular septal defect were subjected to cineangiography (or autopsy) analysis. Three infants without left ventricular outflow tract obstruction were salvaged by aortoplasty using a subclavian flap or a Dacron patch with concomitant pulmonary artery banding. The remaining 8 infants died surgically or nonsurgically, and were confirmed retrospectively to have had left ventricular outflow tract obstruction. It seems worthwhile to stress that the presence of an abnormal muscle bundle in the left ventricle can be demonstrated angiographically, especially by the axial technique. From our present study, though the number of cases examined is limited, we have an impression that left ventricular outflow tract obstruction may be a determining factor with regard to the appropriateness of pulmonary artery banding in the two-stage operation for infantile coarctation associated with a large ventricular septal defect.

Aortic Coarctation↗
PubMed1983

[Experimental and clinical studies of an ampicillin suppository (KS-R1) in pediatrics].

Pharmacokinetic and clinical studies of ampicillin suppository (KS-R1) was performed in children. The results were as follows. Peak serum level of ampicillin (ABPC) after single administration of KS-R1 contains 125 mg or 250 mg of ABPC in potency was 6.03 micrograms/ml after 15 minutes and 5.78 micrograms/ml after 30 minutes, respectively. The half-life was 30.4 minutes and 30.9 minutes, respectively. Urinary excretion rate was 34.2-70.1% within 6 hours. A clinical study of KS-R1 was performed in 40 patients including purulent tonsillitis (10 cases), pharyngitis (9 cases), bronchitis (6 cases), bronchopneumonia (2 cases), scarlet fever (8 cases), otitis media (1 case) and urinary tract infection (4 cases). The clinical effects, excellent and good responses, were showed in 37 cases (efficacy rate; 92.5%). No side effects and abnormal laboratory findings were observed.

Age Factors↗
PubMed1979

Genetic mapping of the chromosomal replication origin of Salmonella typhimurium.

Two hundred strains of Escherichia coli harboring Filv+ plasmids which carry a segment of the Salmonella typhimurium chromosome were isolated independently. Among them, two strains were found to harbor F' plasmids that are able to replicate in Hfr cells of E. coli; i.e., they carry a site designated poh (permissive on Hfr) of the S. typhimurium chromosome. The poh site is presumably identical with the replication origin (oriC) of the bacterial chromosome. These two plasmids carry the dnaA-uncA-rbs-ilv-cya-metE region of the chromosome of S. typhimurium. Other F' plasmids which only carried the ilv-cya-metE region were unable to be maintained in Hfr cells. The poh site (= oriC) of S. typhimurium thus is located in the uhp-ilv region of the chromosome. The two plasmids carrying the poh site of S. typhimurium can suppress the temperature-sensitive character of an E. coli mutant that carries the temperature-sensitive dnaA46 allele, when the plasmids exist in the mutant cells. This suggests that the dnaA chromosome in place of the dnaA gene product of E. coli itself. The ability of the plasmids carrying the poh site of S. typhimurium to replicate in Hfr cells of E. coli suggests that the replication system of E. coli can recognize the Salmonella replication origin.

Chromosome Mapping↗