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Biomedical subjects

Y Katayama

Publications and source records attributed to Y Katayama.

At least 865 records · Page 48Linked to original sources
PubMed1971

Membranous structure of purified Escherichia coli lipopolysaccharide.

The ultrastructure of the purified and lyophilized endotoxin from Escherichia coli O111 was observed by ultrathin sectioning. Onion-like globular membrane structures were observed in addition to rod-like and ribbon-like structures, indicating the existence of a globular membrane structure even in the dried state.

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Differential diagnosis of solid renal tumors by MRI. Comparison of in situ relaxation times measured with a 0.1 T imager and histological findings.

The T1 and T2 of kidneys in 5 normal volunteers and 27 patients with renal tumors were evaluated preoperatively using a magnetic resonance imager with a 0.1 T resistive electromagnet, and the T1 and T2 of the renal tumors were compared with the pathological findings: (i) the T1 and T2 of the normal renal medulla were longer than those of the normal renal cortex and psoas muscle; (ii) both T1 and T2 of renal pelvic cancer (RPC) were shorter than those of renal cell cancer (RCC, p < 0.05); (iii) the T2 values of RPC were significantly shorter than those of renal medulla (p < 0.01); (iv) the T1 and T2 of the normal renal cortex of subjects < 50 years old were shorter than those of subjects > or = 50 years old (p < 0.05 and p < 0.01, respectively). These findings suggest that preoperative evaluation of the pathological findings of renal tumors may be possible by calculating the relaxation time using MRI under low magnetic field.

Adult↗