Showing papers by "Jie Zhang published in 1989"

The diagnostic significance of carbohydrate antigen CA 19-9 in serum and pancreatic juice in pancreatic carcinoma.

Abstract: CA 19-9 is a carbohydrate antigen isolated from human colon carcinoma cell line, and is reportedly a tumor marker for pancreatic carcinoma. In this study we determined serum CA 19-9 in 71 normal subjects, 103 patients with benign digestive diseases, 85 patients with periampullary cancers, and 160 patients with other digestive cancers. Serum CA 19-9 was elevated only in 2.3% of normals and benign digestive disease patients, whereas it was increased in 72.7%, 86.4%, and 89.5% of pancreatic, ampullary, and choledochal carcinoma patients, respectively. Of other digestive cancer patients, it was elevated in 23.8%. In addition, very high serum CA 19-9 (greater than 120 u/m) was more often observed in patients with pancreatic, ampullary, and biliary cancer patients than in GL cancer patients (54.1% vs 9.4%, p less than 0.001). In 18 normal subjects and 68 patients with benign and malignant diseases, it was found that CA 19-9 content in the pancreatic juice was significantly increased in pancreatic, ampullary, and choledochal cancer patients, whereas in chronic pancreatitis patients it was normal, indicating that it is a specific and valuable tumor marker in differential diagnosis of pancreatic cancer.

The Copper Valence State and the Structure of Li, Ce, Eu, V-Doped Y-Ba-Cu-O System

Abstract: High-Tc superconductors with nominal composition of YBa2Cu3Oy and Y1−xLxBa2Cu3Oy (L=Li, Ce, Eu, V) were synthesis by the solid state reaction of appropriate amount of Y2O3, BaO or BaCO3, Cu2O, CuO, and LOx. The Cu3+/Cu2+ ratio was determined by Iodometric titration and oxygen content in the oxides calculated from the ratio. The crystal structure was determined by electron and powder X-ray diffraction analysis. It shows that that ratio of Cu3+/Cu2+ and the crystal structure could be changed as dopping appropriate amount of metal in the Y-Ba-Cu-O system.