Objective To investigate the effects of 810 nm semi-conductor laser irradiation on the proliferation of olfactory ensheathing cells in vitro. Methods Olfactory ensheathing cells obtained from adult rat olfactory mucosa using the method based on different rates of attachment were irradiated with a semi-conductor laser ( wave length 810 nm; power density 10.3 mW/cm2) for 30, 60 or 120 seconds. Laser irradiation was performed 3 times with a 24 h interval. After the last irradiation, the cells were cultured. At the 3rd, 5th and 8th day of cell culture,cell proliferation was assessed with cell counts and a methylthiazoletetrazolium ( MTT) colorometric method. Results After 3 days of cell culture, the number of cells and average MTT values showed no statistically significant difference between the irradiated and control groups. At the Sth and 8th day, the differences among all the laser exposure groups and with the control group were significant, except for the average MTT values of the control group and the 30 s exposure group. Maximal effect was achieved with a 60 s exposure. Conclusions Low power laser irradiation can stimulate the proliferation of olfactory ensheathing cells in vitro, and the effect is time-dose dependent. The optimal irradiation time was found to be 60 s daily for 3 times, with a 24 h interval.

Objective To investigate the clinical characteristics of hospital infection and the pathogen type,distribution and drug resistance,in the intensive care unit of our hospital,to direct proper antibiotics use and supply the scientific basis for hospital infection control. Methods The clinical data of 392 inpatients in our intensive care unit from April 2008 to March 2010 were monitored prospectively and analyzed retrospectively. Results Of the 392 impatients,78 cases had hospital infection (19.89% 78/392),112 time-case infection (28.57% 112/392). The most common infection was the main respiratory tract infections accounted for 54.46% (61/112) ,followed by urinary tract infections accounted for 15. 19% ( 17/112 ), blood infection accounted for 11.61% (13/112). 152strains pathogens were identified in the study,in which G- bacilli accounted for 69.7%, G+ bacteria accounted for 17. 8% and fungi accounted for 12.5%. Main pathogens such as acinetobacter baumannii ,pseudomonas aeruginosa,klebsiella pneumoniae, staphylococcus aureus showed multiple drug resistance in different degrees. Conclusions Intensive care unit has a high nosocomial infection rate,lower respiratory tract infection is the most frequent type and the main pathogens have different degrees of multi-drug resistance. Standardized, rational use of antibiotics,prevention of the multi-drug resistant bacteria spread may help to reduce the occurrence of hospital infection in intensive care unit.

Objective The purpose of this study was to investigate the correlation of high sensitivity C-reactive protein (hsCRP) and fibrinogen with carotid artery arteriosclerosis of patients with cerebral infarction. Methods One hundred and thirteen patients with cerebral infarction were assigned as study group, and 102 healthy persons as control group. The levels of serum hsCRP and Fib in the two groups were measured. The carotid artery arteriosclerosis and carotid intimal-medial thickness (IMT) were examined by color Doppler and B-ultrasound. Results The value of IMT between study group and control group was statistically significant. The positive rates of carotid artery arteriosclerosis plaque and vulnerable plaque in study group were significantly higher than those in control group (all<0.05) . The level of serum hsCRP was significantly higher in study group than that of control ( <0.05) . The level of serum Fib between study group and control group was not statistically significant ( >0.05) . Conclusion The level of hsCRP was closely related to the degree of carotid artery arteriosclerosis and the occurrence and development of cerebral infarction. But the level of Fib was not closely related to the degree of carotid artery arteriosclerosis.

The development of laboratory animal science plays a supporting role in the biomedical field, pharmacy and other fields.It is an important symbol to measure the level of science and technology in each countries in the world. The quality of employees directly affects the speed and quality of the development of laboratory animal industry.The purpose of this standard is to regulate the requirements of animal practitioners, to strengthen the training and qualification certification, and to promote the quality of employees.

Objective To determine the effects of ?-lipoic acid on bone metabolism in lead-poisoned rats.Methods Totally 31 SD rats were randomly divided into two groups,8 rats in blank control group and 23 in lead group that received gastric lavage with lead acetate(230 mg/L).After 40 days,3 rats from each group were taken for the measurement of lead in the blood and bone.The rats in lead group were then randomly divided into four groups: lead control group and three lead groups with different concentrations of ?-lipoic acid [30,60 and 100 mg/(kg?d)],with 5 rats in each.At the end of the experiment(80 d),the rats were killed and the samples of whole blood,serum and bone were collected to detect osteocalcin content with radioimmunoassay and alkaline phosphatase expression with immunohistochemistry staining.Results ① Blood and bone lead contents in each ?-lipoic treatment group were significantly lower than those in lead control group(P

Objective To observe the preliminary clinical results and safety of 27-gauge microincision vitrectomy surgery for partial vitreoretinal diseases.Methods A total of 13 patients (13 eyes) who underwent 27-gauge microincision vitrectomy surgery were enrolled.The follow-up period was 6 to 12 months.Preoperative and postoperative visual acuity and intraocular,total operative time,cutting time for removing vitreous,wound healing status,intraoperative and postoperative complications were observed.Results Mean best corrected visual acuity improved from preoperative (1.26±0.66) logMAR (0.10±0.09) to postoperative (0.63±0.52) logMAR (0.35±0.24),and the difference was statistically significant (t=2.743,P=0.018).The difference of mean preoperative intraocular pressure (IOP),IOP of postoperative day 1,day 5,one month and final postoperative visit were not statistically significant (F=0.593,P＞0.05).The mean total operative and cutting times were (36.38±14.97) min and (10.12±3.54) min respectively.Postoperative scleral incision showed linear closure,no cases of postoperative sclerotomyrelated complications such as wound dehiscence,vitreous incarceration and subcoujunctival fluid were observed.No intraoperative and postoperative complications of iatrogenic retinal breaks,endophthalmitis,choroidal detachment,retinal detachment and vitrous hemorrhage were observed.Conclusions The 27-gauge microincision vitrectomy surgery can improve postoperative visual acuity for treatment of vitreoretinal diseases and induce fewer sclerotomyrelated complications,which maybe a safer surgical approach.

BackgroundRetinitis pigmentosa (RP)is a group of progressive monogenic inheritance disease.Seldom epidemiology is performed to summarize the varied clinical phenotypes,especially some sporadic cases with untypical genetic history.ObjectiveThe aim of this survey was to investigate the clinical epidemiological characteristics and phenotype of sporadic RP.MethodsA prospective cohort study was designed.A survey of a series of clinically diagnosed sporadic primary RP patients was conducted at the Southwest Eye Hospital from July 2010 to November 2011.A total of 130 patients that matched the inclusion criteria were enrolled in this survey.Clinical ocular examinations and questionnaire surveys were given,including ophthalmoscopic examination,best corrective visual acuity( BCVA ),perimetry and Ganzfield electroretinogram (ERG)and color fundus photo.RP with different phenotypes were classified. ResultsA total of 130 sporadic RP patients were collected in this survey.Of them,66 were male and 64 were female with a mean age of (36.9±14.4) years.The average onset age of these subjects was (21.2±18.4) years.Seven (5.38％) patients had consanguineous marriage history,and 13 ( 10.00％ )patients had systemic disease.Forty-four (33.85％) patients had outdoor jobs,and 86 (66.15％ ) worked indoor.Eighty-nine patients had typical RP ( 68.5％ ),and the number of patients that developed central RP and sine pigmento RP were 16 ( 12.3％ ) and 16( 12.3％ ),respectively.An absence of a- and b-waves in full-field ERG wasdetected in 99 (76.15％ ) cases.The longest duration of night blindness was identified in typical RP patients and the lowest BCVA in central RP patients.ConclusionsThe age at first onset is early in sporadic RP.There are wide variations in different types of RP,but the ERG outcome is specific for all RP types.

Background Chondroitin sulphate proteoglycans (CSPGs) can cause the termination of ocular dominance plasticity in the visual cortex.Recently,protein tyrosine phosphatase σ (PTPσ) has been identified as a receptor that inhibits CSPGs.However,whether PTPσ and its downstream molecules participate in the reactivation of ocular dominance plasticity in adult visual cortex has not been studied.Objective The present study was to investigate the changes in the expression of the PTPσ,probabilistic neural networks (PNNs),and molecules downstream of PNN,such as N-cadherin/β-catenin,after the reactivation of adult visual cortical plasticity.Methods Fifty-four SPF Long Evans rats were grouped according to different postnatal week (PW) as the PW1 (6 rats),PW3 (6 rats),PW5 (6 rats),PW7 (24 rats),and PW9 (12 rats) groups,and the upper and lower eyelids were sutured in the 12 rats from the PW7 group for 14 days to establish the binocular plasticity reactivation models.Expression of PTPσ and PNNs in the rat visual cortex was detected using immunochemistry,and changes of PTPσ mRNA,N-cadherin mRNA and β-catenin mRNA expression in the rat visual cortex with plasticity reactivation were assessed by real-time fluorescence quantitative PCR (RT Q-PCR).The use of animals followed the Regulations for the Administration of Affairs Concerning Experimental Animals by State Science and Technology Commission.Results The expression level of PTPσ mRNA was significantly higher in the PW9 group than that of the binocular plasticity reactivation models and the PW7 group (t =1.965,3.526,P＜0.01).The staining of the rat visual cortex for PTPσwas localized to the cellular membrane,cytoplasm and axon.Cell densities of the PW9 group in the Ⅱ-Ⅲ layer,Ⅳ layer and Ⅴ-Ⅵ layer of the visual cortex were elevated in the PW9 rats compared with the PW7 rats (t =24.593,23.444,13.556,P＜0.01) and rats from the binocular plasticity reactivation model (t =44.111,43.000,16.556,P＜0.01).Cell densities for PNNs in the Ⅳ and Ⅴ-Ⅵ layers were significantly increased in the PW9 rats in comparison with the PW7 rats (t=1.926,P＜0.01 ;t=1.370,P＜0.05),but the cell density in the Ⅱ-Ⅱ layer has no statistical significance (t=0.889,P＞0.05).However,cell densities for PNNs in the Ⅱ-Ⅲ and Ⅳ layers in the binocular plasticity reactivation models were lower than those of the PW9 rats (t =2.556,4.585,P＜0.01).Compared with PW1 rats,the expression levels of the N-cadherin mRNA in the PW3,PW5,PW7,PW9 rats were lower (t =28.932,28.988,27.083,28.908,P＜0.01),but those in the PW7 rats were enhanced in comparison with the PW3 rats,PW5 rats and PW9 rats (t =1.848,1.904,1.825,P＜0.01).No significant difference was seen in the expression of the N-cadherin mRNA between the PW9 rats and rats from the binocular plasticity reactivation model (t =0.072,P＞0.05).A statistically significant increase was found in the β-catenin mRNA expression in the PW1 rats compared with the PW3,PW5,PW7 and PW9 rats (t =3.918,3.534,2.645,4.652,P＜ 0.0 1),as well as between rats from the binocular plasticity reactivation model and the PW9 rats (t =0.570,P＜0.01).Conclusions PTPr,PNNs and β-catenin are involved in the reactivation of ocular dominance plasticity in the adult visual cortex.

Objective To explore the relationship between serum cccDNA and liver damage in the patients with chronic HBV infection.Methods Serum cccDNA,ALT of 156 patients with chronic HBV infection were measured,and pathology of liver tissue in 85 patients was detected.Results The positive rate of Serum cccDNA and ALT had no significant difference(P＞0.05).Between pathology light,medium and severe group,S0_(～1) and S_(2～4) group,G_(0～1) and G_(2～4) group the serum cccDNA mean was significantly different(P＜0.01).The positive rate of serum cccDNA was significantly different between the group of NAASC and ASC,CH,LC,HCC,and the group of ALT ≤40u/Land 40～80,80～400,≥400u/L(P＜0.01).Conclusion Serum cccDNA and liver inflammation,fibrosis and ALT had no relevance,serum cccDNA with at a low level may be non-active,but should be excluded from serious liver diseases.

Objective To evaluate the safety and efficacy of self-expanding metallic stents (SEMS) in one-stage surgery for patients with left-sided malignant colorectal obstruction. Methods The clinical data of 97 patients with left-sided colorectal cancer who had been admitted to the First Affiliated Hospital of Zhejiang Chinese Medical University from May 2005 to September 2008 were retrospectively analyzed. Forty-six patients with left-sided malignant colorectal obstruction were in the test group, after the placement of SEMS, they received one-stage resection and anastomosis; 51 patients with left-sided colorectal cancer (without obstruction) were in the control group, and they received one-stage surgery. The defecation and anal exhaust time, hospital stay and incidence of postoperative complications between the 2 groups were analyzed. All data were analyzed via t test or chi-square test. Results One patient in test group had acute diffuse peritonitis which was induced by intestinal perforation at postoperative day 4, and was treated with radical resection for sigmoid cancer. One-stage surgery was successfully performed on 45 patients, and they were discharged at postoperative day 11-16. One patient died of respiratory infection and heart failure at postoperative day 10. All patients were followed up for 4-48 months. There was no significant difference in defecation and anal exhaust time, hospital stay, incidence of perioperative complications, recurrence, metastasis and survival within follow-up interval between the 2 groups (t=0.164, 1.358, χ~2 = 0.252, 1.200, 0.580, P >0.05). Conclusion SEMS is effective and safe in the treatment of left-sided malignant colorectal obstruction.