Purpose　The aim is to study the effects of solubl e chit osan on antitumor factors and NK cell activity in rats.Methods　The level of NO、TNF produced by peritoneal macrophages,IFN-γ production and NK ce ll activity of spleen was detected,after different concentrations of chitosan we re injected into the sarcoma 180 rats peritoneally.Results　Th e cont ents of NO、TNF、IFN-γ and NK cell activity in sacroma 180 rats were significa ntly higher in the chitosan groups than those in the control group (P＜0.01) .Conclusion　Chitosan could impove the immune function in rats .

The paper discusses the experimental teaching reform of biochemistry by referring to the characteristics of biochemical development and special feature.The reform increases effectually the interests of medical students,and may contribute to their creative competence and the abilities of scientific research.

OBJECTIVE: To summarize the characteristics of reoperative valve surgery after previous open-heart valve surgery. METHODS: From 1996 to 2010, 155 patients who underwent reoperative valve surgery, either valve replacement or tricuspid annuloplasty or the repair of perivalvular leakage were included in the study. The reoperative interval was 1-266 (94.82 ± 85.37) months. All surgeries were carried out with extracorporeal circulation under moderated hypothermia. The cardioplegic solution in cold crystal or blood was used if heart beating was stopped during the surgery. RESULTS: The total in-hospital mortality was 5.81%, while it was 2.75% from 2005 to 2010. The end-diastolic dimension, size of atrium and ventricles were reduced after the reoperation. Ventricular arrhythmia and low cardiac output were the most frequent complications. CONCLUSION The success rate of reoperative valve surgery can be improved by the distinctive therapeutic strategies based on the clinical characteristics and therapy principles obtained from practice experiences.
Adolescent ; Adult ; Aged ; Cardiac Output, Low ; etiology ; Cardiopulmonary Bypass ; Child ; Female ; Heart Valve Diseases ; mortality ; surgery ; Heart Valve Prosthesis ; Heart Valve Prosthesis Implantation ; adverse effects ; methods ; mortality ; Humans ; Male ; Middle Aged ; Reoperation ; Tachycardia, Ventricular ; etiology ; Young Adult