OBJECTIVE: To discuss the biosafety and biocompatibility of biomaterials. METHODS: A computer-based online search of CNKI, CBM and VIP as well as manual search were performed to collect articles about random cell control experiments and animal experiments of biological material biocompatibility published between 1990 and 2008. A total of 28 Chinese literatures were collected, and 7 were included mainly involving the cytotoxicity test methods and blood compatibility of the experimental medium, experimental grouping, experimental materials, methods of observation, experimental results, and experimental conclusion. In addition, biocompatibility of the biological material was analyzed to summarize the biocompatibility of the biological safety. RESULTS: Based on experiments of biosafety and biocompatibility of biomaterials, the cytotoxicity test and blood compatibility of various biomaterials, such as collagen, chitosan, magnetic nanoparticle, metal vascular stent, sulphurated siliastic medical grade silicon rubber, polyurethane, ceramic coatings by micro-arc oxidation, are essential for the biological safety. The experimental results have shown that the biomaterials have good biocompatibility. CONCLUSION: A variety of biological materials present good biocompatibility, including collagen, chitosan, magnetic nanoparticle, metal vascular stent, sulphurated siliastic medical grade silicon rubber, polyurethane, ceramic coatings by micro-arc oxidation, based on the evaluation criteria.

Objective To explore the recurrence-prevention effect of oral contraceptive and levonorgestrel-releasing intrauterine system (Mirena) after hysteroscopic endometrial polypectomy.Methods One hundred and seventy-four patients who received hysteroscopic endometrial polypectomy were enrolled in this research.The patients were informed and divided into three groups according to their selection:51 cases were given oral contraceptive since one month until 12 months after the surgery (oral contraceptive group); 60 cases were received Mirena since one month after the surgery (Mirena group) ; and 64 cases were received no treatment after the surgery (control group).The groups were followed up at 3,6,12 months after the surgery and compared the recurrence rate,menstruation,level of hemoglobin and complication rate.Results The recurrence rate in oral contraceptive group,Mirena group and control group was 3.9％(2/51),3.3％ (2/60) and 19.0％ (12/63),respectively.The recurrence rate in control group was higher than that in oral contraceptive group and Mirena group,and there was significant difference (P ＜ 0.05).The proportion of low menstruation volume in control group was lower than that in oral contraceptive group and Mirena group,and there was significant difference (P ＜ 0.05).The level of hemoglobin in control group was lower than that in oral contraceptive group and Mirena group [(124.55 ±9.33) g/L vs.(133.71 ± 11.03),(135.89 ±6.88) g/L],and there was significant difference (P ＜ 0.05).The incidence of complication in Mirena group [18.3％ (11/60)] was less than that in oral contraceptive group[35.3％(18/51)],and there was significant difference (P ＜ 0.05).Conclusions Oral contraceptive and Mirena after hysteroscopy for endometrial polys significantly decrease the recurrence rate.The complication rate of Mirena is lower and it is a safe and effective way to treat and prevent the endometrial polyp.

Objective Experimental research demonstrated that oxidative damage leads to formation of cataract in rats and its machanism is the decline of activities of superoxide dismutase(SOD), glutathione peroxidase(GSH-PX) and catalase(CAT) . Aaspirin can improve the antioxidative ability of lens. The purpose of this study was to observe the inhibition of aspirin on D-Galactose-induced cataractous lenses of rats. Methods Galactose cataract model was established in 40 cleaning Wistar rals by intraperitoneal injection of 20 mL/kg 80% D-Galactose for 10 days. The models were divided into model group (20 rats) and aspirin group(20 rats). 150 mg/kg of aspirin was administered immediately by gastrogavaging in aspirin group for 20 days. Other 20 normal Wistar rats were as control group. At day 3, 6, 10, 14, 20, the transparency of rat lenses was observed under the slit lamp microscopy. At day 5 after experiment, the ultrastructure of the lenses was examined and evaluated under the scanning electron microscopy. The activities of SOD, GSH-PX and CAT were detected by Coomassie Brilliant Blue color comparator, respectively. The use of experimental animal followed the Regulations for the Administration of Affair Concerning Experimental Animals by State Science and Technology Commission. Results All lenses were transparent in the rats of control group. The degree of lens opacity was more mild in asprin group compared with model group. 25. 00%, 41. 67%, 58. 33%, 83. 33% of lenses in aspirin group showed swelling at day 6, 10, 14, 20, respectively, but 65% lenses were opacity in model group on day 3 and 100% lenses were nuclear cataracts in 6 days. The structure of lenses was normal in control group, but the process number, fiber thickness and fiber density of lens were significantly increased in model group compared with control group (P ＜0. 05), and only process number was increased in asprin group. The activities of SOD, GSH-PX and CAT in lens of model group were obviously lower than in normal control group(P＜0. 05), but those in asprin group were significantly increased in comparison with model group(P ＜0. 05). Conclusion Aspirin could protect lenses of rats against oxidative damage by elevating activities of SOD, GSH-PX and CAT in lens and inhibiting the generation and development of galactose-induced cataract at early stage of cataract.

Objective To evaluate the influencing factors for postoperative odynophagia in elderly patients undergoing intraoperative transesophageal echocardiography (TEE) examination for cardiac surgery.Methods A total of 96 patients with intraoperative TEE examination for cardiac surgery was divided into two groups:the elderly group (patients aged ≥65 years,n=60) and the young group (patients aged ＜ 65 years,n =36).Clinical data were retrospectively analyzed.Postoperative odynophagia was assessed by number rating scale (NRS) scores.Characteristics of postoperative odynophagia were compared between the two groups.Influencing factors for postoperative odynophagia were analyzed by multivariable logistic regression analysis.Results The incidence of postoperative odynophagia and the average NRS score were higher in the elderly group thanin the young group [88.3％ vs.66.7％,(2.6±1.7) vs.(1.4±0.9),P＜0.05 or 0.01].Multivariate logistic regression analysis showed that preoperative oral lidocaine plasmagel,oropharyngeal mucosal injury and duration of TEE insertion were independent influencing factors for postoperative odynophagia (all P＜0.01).Conclusions The incidence of postoperative odynophagia is higher and the degree of odynophagia is more serious in elderly patients undergoing intraoperative TEE examination for cardiac surgery.Postoperative odynophagia can be relieved by applying the preoperative oral lidocaine plasmagel,reducing oropharyngeal mucosal injury and shortening the duration of TEE insertion.

Objective To express and purify the killer immunoglobulin-like receptor KIR3DL1 extracelluar domain.Methods pUC57-KIR3DL1 was used as template,KIR3DL1 extracelluar domain was amplified by polymerase chain reaction(PCR)and cloned into pGEM-T vector with A-T cloning technique.After DNA sequence analysis,the target fragment was inserted into the prokaryotic expression vector pET28a-DsbA to construct the recombinant vector pET28a-DsbA /KIR3DL1.The recombinant plasmid was transformed into E.coli BL21(DE3),and induced with IPTG.Bacterial pellets were resuspended in 8M urea and centrifuged to remove the insoluble material.The crude extract was purified by passing over a Ni-NTA-agarose column.After the inclusion body flowing through the Ni-NTA-agarose affinity chromatography was refolded successfully,it was purified by Superdex75 gel filtration and the purification effects of the fusion protein were identified by SDS-PAGE and western blot.Result Some fusion proteins were expressed in the supernatant,and the others were expressed in the form of inclusion bodies.The purity of fusion protein was over 95% after purification under denaturing condition.Conclusion The highly efficient expression of KIR3DL1 extracelluar domain laid the foundation for the further studies on exploration of the mechanism of immunization recognition between KIR3DL1 and its ligand.

Sepsis is a frequently met syndrome with complex clinical symptoms and high mortality in emergency department. Early diagnosis of sepsis and timely treatment can improve survival. In recent years, the application of biomarkers [such as procalcitonin (PCT), C-reactive protein (CRP), interleukin-6 (IL-6)] are commonly used in the early diagnosis of sepsis, but their specificity and sensitivity are limited because of the long lag of report time. Soluble leukocyte differentiation antigen 14 sub type (sCD14-ST, namely presepsin) is a kind of novel biomarkers. Presepsin has a high specificity and sensitivity in the diagnosis of sepsis. It has some value to evaluate the severity of sepsis, antibiotic treatment of antibiotics, and prognosis of the patients with sepsis, and its latest detection method is fast and accurate, so it has the feasibility of clinical application.

Objective To study the association of body mass index (BMI) and waist circumference (WC) with dyslipidemia and the risk of dyslipidemia at different BMI and WC level among adults in Suzhou Industrial Park District. Methods A total of 6219 participants were chosen by stratified random cluster sampling method. Four streets were selected form the district first, then one community as a cluster was selected randomly from each street. Questionnaire survey, physical examination and laboratory tests were done by all subjects. Results The prevalence of dyslipidemia was 35.9％;the rates of overweight, obesity and central obesity were 36.6％, 9.6％ and 49.5％ respectively. The prevalence of dyslipidemia in underweight group, normal weight group, overweight group and obesity group were 13.6％, 30.2％, 47.7％and 59.0％ for male, and 17.2％, 27.3％, 38.6％和 48.8％ for female respectively. The prevalence of dyslipidemia for male and female both rose with BMI (χ2=139.848, P<0.001; χ2=92.387, P<0.001). The prevalence of dyslipidemia in the high waist circumference group and normal group were 50.2％and 30.9％for male, and 40.8％and 23.8％for female respectively. Prevalence of groups with high waist circumference for male and female were significantly higher than normal groups (χ2=108.669, P<0.001; χ2=110.642, P<0.001). Pearson correlation analysis showed that total cholesterol (TC), triglyceride(TG), and low density lipoprotein cholesterol (LDL-C) were positively correlated with BMI ( r=0.153, P<0.001;r=0.227, P<0.001;r=0.192, P<0.001), and were also positively correlated with WC(r=0.138, P<0.001; r=0.234, P<0.001; r=0.159, P<0.001). High density lipoprotein cholesterol(HDL-C) was negatively correlated with BMI (r=-0.189, P<0.001) and WC (r=-0.185, P<0.001). Logistic regression analysis after age adjustment showed that, compared to the group with BMI<24 kg/m2 and WC<85 cm(male)/WC<85 cm (female), odds ratios (OR) for male in group with BMI<24 kg/m2 and WC≥85 cm, group with BMI≥24 kg/m2 and WC<85 cm and group with BMI≥24.0 kg/m2and WC≥85 cm were 1.602, 1.834 and 3.064 respectively, and ORs for female in group with BMI<24.0 kg/m2 and WC≥80 cm and group with BMI≥24.0 kg/m2 and WC≥80 cm were 1.703 and 2.381 respectively, however, the OR for female in group with BMI≥24.0 kg/m2 and WC<85 cm was not statistically significant (P>0.05). Conclusions BMI, waist circumference and dyslipidemia were closely correlated. Waist circumference is more important than BMI for female.

ProTide technology is a kind of prodrug design strategy invented by the team of Christopher McGuigan. ProTides are aryloxyphosphoramidates (or aryloxyphosphonamidates) which contain a phosphorus atom combined with an amino acid ester and an aryloxy group. These prodrugs can efficiently cross the cell membrane and escape from the first rate-limiting step of phosphorylation, which afford effective solutions to the drawbacks of current nucleoside analogues. At present, ProTide technology has been extensively applied in the field of antiviral research. It has been successful in providing a number of approved drugs and clinical candidates, such as sofosbuvir and so much more, highlighting the promising future in drug discovery. This review summarizes the brief history and characteristics of ProTide technology, as well as its application in the exploration of antiviral drugs.

Adolescent ; Diagnostic Errors ; Foreign Bodies ; diagnosis ; Humans ; Male ; Trachea

Animals ; Biological Availability ; Drug Carriers ; chemistry ; Drug Delivery Systems ; Humans ; Lactic Acid ; chemistry ; pharmacokinetics ; Nanoparticles ; Polyesters ; Polyethylene Glycols ; chemistry ; pharmacokinetics ; Polyglactin 910 ; chemistry ; pharmacokinetics ; Polyglycolic Acid ; chemistry ; pharmacokinetics ; Polymers ; chemistry ; pharmacokinetics