ABSTRACT
Cation exchange (CX) reaction for the non-fluorescent ZnS nanocrystal clusters (NCCs) can be used to detect trace biomolecules . Nano clusters synthetized by hydrothermal synthesis are porous. So they can quickly release large amounts of Zn2+ from through cation exchange ( CX) reaction and nano cluster, generate fluorescent signal under the action of zinc reagent to detect fluorescence. The relationship between the release efficiency, target binding force of Zn2+ and its average diamete was investigated when the average diameter was 44 nm, 86 nm and 144 nm in this experiment. Results showed that the smallest nano cluster exhibited the highest cation exchange efficiency, and 71 percent of Zn2+ closed could be released by microwave radiation within 2 min. When the sandwich method of NCCs of 44-nm was used to detect immunoglobulin E (IgE) in a sandwich assay, the limit of detection (LOD) was 5 ng / L, which was 1000 times lower than that of ELISA. It turns out that CX for the ZnS NCCs is superior to the conventional signaling strategies in its high amplification efficiency, robustness, and biocompatibility.
ABSTRACT
Objective To study the clinical characteristics, diagnosis and treatment of extrahepatic growing hepatocellular carcinoma(HCC). Methods The clinical data of 11 patients with extrahepatic growing HCC were analysed retrospectively. Results The mean diameter of the tumors was (12.4?4.3)cm.All the tumors in the 11 patients had complete capsule formation. The numbers of tumors located in the left, right and caudate lobe of the liver were 6,3 and 2 respectively. Surgical treatment included segmentectomy in 6 cases , lobectomy in 4 cases, and unresectable in 1 case. The 1-, 2-, and 3-year survival rates were 80.1%,62.3%, and 47.6% respectively. Conclusions Although the size of extrahepatic growing HCC is large,the resection rate is high and prognosis is good. The resection of hepatic segments or lobes containing the lesion should be done in radical operation of this tumors.
ABSTRACT
Objective To determine the relationship between endothelin-l(ET-1)with blood flow of gastric mucosa and gastric mucosal injury (GMI) in obstructive jaundice rats induced by coldly restrainting stress. Methods 161 rats were randomly assigned into the experimental (obstructive jaundice) group (n=70), the control (sham operative) group (n=70) and the anti-ET-1 preconditioning group (n=21). The obstructive jaundice model was set up in the experimental group and the anti-ET-1 preconditioning group. Both the experimental group and the control group were re-assigned into 5 subgroups which underwent non-coldly restraint and coldly restraint for 10, 30, 60 and 120 min respectively. The anti-ET-1 preconditioning group underwent anti-ET-1 serum precondition 30,60 or 120min before the coldly restraint. The ET-1 was detected by radioimmunologic method and the gastric mucosal blood flow (GMBF) by laser Doppler flowmeter. Results The concentrations of ET-1 in gastric mucosa and ulcer index significantly increased (P
ABSTRACT
Objective To evaluate the feasibility and safety of resection of tumors in hepatic centric area. Methods The clinical data of 36 patients with tumors in hepatic centric area treated by resection in our hospital from Jan 1996 to Dec 2001 were retrospectively analyzed. In this series,there were 26 cases of liver cancer and 10 cases of benign tumor. Of the 36 patients,the tumor involved the first porta hepatis in 13 cases, involved the second porta hepatis in 10 , involved the third porta hepatis in 5 , involved both the first and second porta hepatis in 3, and involved both the second and third porta hepatis in 5 cases. Results During the operation, massive hemorrhage occurred in 4 cases(11.1%). Postoperative complications occurred in 11 patients(30.5%),including liver function failure in 1 case (2.7%), biliary fistula in 2 cases (5.5%), pleural effusion in 6 cases (16.7%), subphrenic infection in 1 case (2.7%),and abdominal incisional hernia in 1 case (2.7%). All patients recovered except that one died of acute hepatic failure after the operation. Conclusions Although the surgery for this tumor is quite difficult and risky, if enough attention is paid to the choice of the patient,and the meticulous surgical technique,the operation safety and therapeutic result of the operation could be improved.