Objective To study the changes of hematological indices of blood donors after 400ml whole-blood donation.Methods Blood specimens of 123 healthy donors were collected before donation,1 day,7 days,1 month,and 3 months after donation.The dynamic changes of WBC,RBC,hemoglobin,hematocrit,Plt,plasma total protein,albumin and blood serum iron were observed.Results After donation,the changes of WBC,Plt,total protein of blood plasma and albumin showed no significant change.The levels of RBC,hemoglobin,hematocrit and blood serum iron returned to normal after 3 months.Conclusion For anyone who meets the health standard of blood donors,to donate 400ml whole blood at 3-month interval is harmless.

Objective Preparing platelet rich gel through two-times centrifugal technique and co-culturing chondrocytes with PRG, then observing the proliferation and gene expression of chondrocytes, in order to provide a favorable way to prepare tissue engineering cartilage. Methods Centrifugating venous blood of rabbit through two-times centrifugal technique to obtain platelet rich plasma( PRP) ,then detecting the concentration of various growth factor in PRP. Admixing PRP with chondrocytes of rabbit and activating them with activator. After co-culti-vation,the proliferation of chondrocytes through MTT method and expression of ACAN,CollagenⅡand SOX-9 through realtime-PCR were ob-served,and compared with common cultured chondrocytes. Results The concentrations of PDGF-AB,TGF-β1,IGF-1 and VEGF in PRG were significantly higher than those in blood(P<0. 05). After co-cultivation, the proliferation rate of chondrocytes and the expression of ACAN,Collagen Ⅱ and SOX-9 were significantly higher than that of common cultured chondrocytes(P<0. 05). Conclusion Co-culturing chondrocytes with PRG is able to promote the proliferation and gene expression of chondrocytes. We considered that it is a excellent method to construct tissue engineering cartilage.

Objective To evaluate the efficacy between cylindrical abdominoperineal resection(CAPR)by laparoscopy and traditional abdominoperineal resection(APR). Methods A retrospectively analysis was done in the data of patients with low rectal cancer who underwent APR in our department from January 2010 to September 2015. The patients were divided into two groups,including cylindrical abdominoperineal resection by laparoscopy and traditional abdominoperineal resection. The operation time,intraoperative bleeding,the time of intestinal exhaust as well as the postoperative complications of the two groups were compared. Results There were no statistical differences in the intraoperative bleeding,operation time,the time of intestinal exhaust,postoperative intestinal obstruction and pulmonary infection between the two groups(P > 0.05). However,the differences in the rates of perineal incision infection and tumor intestinal perforation between the two groups were statistically significant (P < 0.05). Conclusion CAPR by laparoscopy is safer,more reliable than traditional APR,which can effectively reduce the rates of postoperative incision infection and tumor intestinal perforation of patients.