Objective: To examine the effect of mouthwashing before dental procedure on environmental pollution of microorganism in dental clinic. Methods: Air samples in dental clinic after tooth preparation whether using mouthwashes or not pre operationally were collected and cultured with blood agar plates, the bacteria colonies formed on the plates in different groups were counted as the index for air contamination. Results: Environmental contamination from tooth preparation in dental clinic could be reduced significantly by using mouthwash pre operationally( P 0.05), but the size of the colonies formed on the plates in Kou Jie Su group was smaller than that in drinking water group. Conclusion: Environmental contamination from tooth preparation in dental clinic can be reduced by using mouthwash pre operationally. Combination of the pre operational mouthwashing with vacuum aspirator or ventilation installation may be a better way to control the possible cross infection in dental clinic.

BACKGROUND: Previous studies has explored the effects of nerve growth factor (NGF) on cultured rabbit Schwann cells as well as preparation of acellular nerve allografts, in addition, the neural complex was prepared in vitro.OBJECTIVE: To investigate the effect of acellular nerve allografts on the functional recovery and reconstruction of the nerve-muscle structure of the sciatic nerve defect in rabbits.DESIGN, TIME AND SETTING: The randomized controlled animal experiment was performed at the Center Laboratory of Third Hospital of Hebei Medical University from March 2006 to June 2007.MATERIALS: Totally 37 healthy, adult, New Zealand, white rabbits were selected. One rabbit was prepared for extracted nerve bridge, and the others were randomly divided into the experimental and control groups, with 18 animals in each group.METHODS: The double sides of sciatic nerve were removed, divested surrounding tissues, and cut into 3 cm segments, then placed in TdtonX-100 solution for 12 hours, washing with distilled water. The procedure was repeated, and TritonX-100 totally used for 96 hours. Then the extracted nerve bridge was conserved in Hank's solution at temperature of 4 ℃. The concentration of 2~(nd) passage Schwann cell was regulated to 1 ×10~(11)/L, and injected to extracted nerve bridge, followed by DMEM culture, to obtain neural complex. Rabbits in the experimental group were prepared a 20 m defects above knee joints, and the recellularized neural complex were transplanted into the defective sciatic nerve. Rabbits in the control group were prepared by transplanting extracted nerve bridge without Schwann cells.MAIN OUTCOME MEASURES: The elcosis and healing of feet were observed at weeks 4, 8, and 16 after operation, meantime,the recovery of axon of distal end peroneal nerves, myelin sheath, tibialis anterior, as well as motor end plate were detected by electromyogram, light microscope and transmission electron microscope.RESULTS: At weeks 4, 8 and 16 after operation, the rejection was not found in the operating field. The experimental group was better than the control group in healing of ulcers, the number of nerve fibres, the ultramicrostructure of medullary sheaths, the regeneration nerve, the structure of the motor end plate and muscle. At 4 weeks after operation, no nerve conduction was found in 2 groups, but at weeks 8 and 16 after operation, the experimental group was better than the control group in wet weight of tibialis anterior muscle and nerve conduction velocity (P < 0.05).CONCLUSION: The recellularized neural complex can significantly promote the reconstruction of the nerve-muscle structure and functional recovery of injured sciatic nerve.

Objective To investigate the feasibility of ADC values in the evaluation of normal fetal brain development by measuring ADC values changes in specific regions with advancing gestational age.Methods Forty fetuses(gestational age:24 to 41 weeks) with normal brain underwent DWI(b value were 0 and 600 s/mm2).ADC values of the frontal white matter(WM),occipital WM,thalamus,basal ganglia,and cerebellum were measured by post-processing software.The differences among different regions' ADC values were calculated by repeated measurements of ANOVA,and simple linear regression was used to evaluate the relationship between ADC values and gestational age.Results The mean ADC valuesof 40 fetuses were(1 800±214) ×10-6mm2/s in frontal WM,(1 400±100) ×10-6mm2/s in basal ganglia,(1 300±126) ×10-6mm2/s in thalamus,(1 700±133) ×10-6mm2/s in occipital WM and(1 400± 155) × 10-6mm2/s in cerebellum,respectively.There was significant difference in the ADC values among the five regions(F=80.813,P＜0.01).In pair-wise comparison,ADC values of basal ganglia,thalamus and cerebellum had no significant difference; however,others had significant difference between each other.With the increasing gestational age,ADC values of basal ganglia,thalamus,occipital WM and cerebellum decreased,and had significant negative correlations with gestational age(Pearson correlation coefficient were-0.568,-0.716,-0.830 and-0.700,respectively,all P＜0.01).In terms of ADC value,occipital WM declined fastest with gestational age,followed by cerebellum and thalamus,and the slowest was basal ganglia.Frontal ADC values showed no correlation with gestational age(P＞0.05).Conclusions Specific regions of fetal brain have specific ADC values,and ADC values of the region undergo regular change with advancing gestational age.ADC value is a specific quantitative parameter that could help to evaluate normal brain development and early diagnosis of fetal brain lesions.

Objective To preliminarily investigate the feasibility of MRI-T2* map in evaluating myocardial iron load of myocardial iron overload rabbit models.Methods Eleven rabbits were included in this study and divided into two groups,myocardial iron overload group (n =10) and the control group (n =1).Iron dextrin (dose of 50 mg/kg) was injected in muscles of thigh once a week,totally 12 weeks.Serum iron test and MRI examination were performed before iron injection,and 1 week to 12 weeks after iron injection.MRI scan protocol included short axial T2* map of the left ventricle and cross-section T2* map of the liver.T2* and R2* of the heart and the liver were measured.One rabbit was killed after MRI examination at pre-iron injection,1 week to 8 weeks,11 weeks and 12 weeks after iron injection,respectively.Heart and liver were avulsed to undergo in vitro MRI scan and then paraffin embedded for pathological slices.MRI scan protocol and measurements of the heart and the liver samples were the same to that of in vivo ones.Pearson correlation was used to calculate the relationships between the parameters.Results Myocardial T2* [(32.5 ± 8.3 ms)] and R2* values [(38.4 ± 7.9) Hz] had significant correlation with injecting iron content(1 033.2 ± 673.4 mg),the Pearson coefficients were-0.799 (P =0.001) and 0.770 (P =0.002),respectively.Myocardial T2 had no significant correlation with liver T2* values (r =0.556,P =0.070).T2* values of heart and liver in vivo [(32.5 ± 8.3) ms and (8.8 ± 5.4) ms],respectively had strong correlation with those in vitro [(19.4 ± 6.5) ms and (9.8 ± 5.0) ms],respectively (r =0.757,P =0.007 and r=0.861,P=0.001).T2* and R2* values of the heart and the liver in vivo and in vitro had no significant correlations with serum iron (P ＞ 0.05).On Prussian blue staining slices,blue particles of myocardium,sinus hepaticus and hepatocyte increased with injecting iron content.Conclusions It is feasible for MRI-T2* map to evaluate the myocardial iron load noninvasively.It may provide reliable information for detecting myocardial iron overload in patients with iron overload at an early stage.

Background Congenital aniridia is a rare congenital autosomal dominant disease,which is shown as aniridia of double eyes,and the paired box gene 6 (Pax6) gene mutation is now known to be associated with congenital aniridia.Objective This study was to screen the Pax6 gene mutation in patients with congenital aniridia.Methods Eleven patients with congenital aniridia were enrolled in Tianjin Eye Hospital from August 2012 to October 2015,including 6 patients from 3 congenital aniridia family and 5 sporadic patients.All patients received routine ophthalmic examination.Peripheral venous blood of 3 ml was collected from the patients for DNA extraction according to the standard process of DNA isolation instructions,and all the exons of Pax6 gene,Elp4 gene,exon 5 ' and 3',intron splice sequence and SIMO sequence were amplified by PCR.Pax6 genes of the patients were sequenced using Sanger direct sequencing and multiplex ligation dependent probe amplification (MLPA) and compared with those of 500 ocular trauma patients.This study complied with Helsinki declaration,and written informed consent was obtained from each patient prior to any medical examination.Results Iris absence was found in all the patients,and the visions acuity was hand motion to 0.2.Lens dislocation was seen in 1 patient.Direct sequencing results found that three patients in AN-O1 family were c.688g＞t (p.E230X) mutation of Pax6 gene,and 3 of 5 sporadic patients carried c.468g＞a (p.W156X),c.613c＞t (p.Q205X) and c.141 +2t＞c mutant of Pax6 gene,and the c.688g＞t (pE230X) mutation was a novel-discovered mutation.No any mutation in Pax6,Elp4 gene and SIMO fragment was detected in 1 patient from AN-02 family,2 patients from AN-03 family and 2 sporadic patients by both direct sequencing and MLPA validation.No above-mentioned mutation was found in 500 normal individuals.Conclusions The mutation of Pax6 gene is a pathogenic mutation in congenital aniridia patients,and c.688g＞t (p.E230X) is a novel Pax6 mutant,which expanded the mutation spectrum of Pax6 gene.

Background Oculocutaneous albinism (OCA) is a hereditary disease of pigment absence in eyes,skin and hair due to the lack of congenital melanocyte.OCA is classified into 7 types based on different genetic mutations,and the mutation of tyrosinase (TYR) gene causes OCA type 1 (OCA1).OCA has obvious genetic heterogeneity and phenotypic heterogeneity.The molecular diagnosis of the mutant gene is helpful for the classification and molecular pathogenesis study of OCA.Objective This study was to screen the TYR mutation in OCA patients,and to analyze the association between the gene mutation type and clinical phenotype.Methods Ten patients with OCA were enrolled in Tianjin Ophthalmological Hospital from January 2011 to December 2014.The clinical and ocular manifestations of the patients were examined.Peripheral venous blood 3 ml was collected in the patients and their lineal relatives for the extraction of genomic DNA.Extracted DNA was amplified by PCR and the TYR gene sequence was analyzed,including all 5 exon coding sequence and exon 5 ' and 3' end and the non-coding region sequence of intron splicing in TYR gene.This study complied with Helsinki Declaration and the protocol was approved by Ethic Committee of Tianjin Eye Hospital.Informed consent was obtained from each subject.Results All the patients showed white or reddish hair and snow-white skin,and different degrees of pigment lack was seen in iris.The best corrected visual acuity of the patients was 0.05-0.2,and 3 patients complicated with nystagmus.Fundus findings showed a sunset-like change and dysplasia of macula.The TYR gene sequencing revealed that patient 1 was OCA1A subtype,with the compound heterozygous mutant of c.832C＞T (p.R278X) and c.1217C＞T (p.P406L),and his/her parents occurred the heterozygous mutation of exons P406L and R278X.The phenotype of the patient 1 was white hair and white iris.The patient 3 was OCA1B subtype,with the compound heterozygous mutations of c.1265G＞A (p.R422Q) and c.1217C＞T (p.P406L),showing an appearance of reddish brown hair and sallow iris.TYR gene mutant was not detected in other 8 patients.Conclusions The mutation of TYR gene is the main cause of OCA1 type.The phenotype of OCA1A subtype is no pigment in eyes and hair,and one of OCA1B subtype was obviously lessening of pigment.The difference of mutant genes of OCA is the cause of genetic and phenotypic heterogeneity.

Objective To investigate the effects of recombinant trichosanthin(rTCS) on methylation status and expression level of p27 gene in HeLa cells.Methods HeLa cells was treated by different concentration(20 ?g/mL,40 ?g/mL,and 80 ?g/mL) of rTCS for 48 h and then methylation-specific polymerase chain reaction(MSP) was used to detect the promoter methylation status of the p27 gene,real-time PCR was used to detect levels of p27 and DNMT1 mRNA,and Western blotting assay was used to detect expression level of p27 protein before and after treatment with rTCS.Results Low expression level and promoter methylation status of the p27 gene were detected in HeLa cells.Treatment with 40 ?g/mL rTCS totally demethylated p27 promoter.Treatment with 20 ?g/mL,40 ?g/mL or 80 ?g/mL rTCS resulted in a 2.22-,4.00-or 6.03-folds increase in p27 mRNA level,respectively,and also a great increase in p27 protein level.A high DNMT1 expression level was observed in HeLa cells and treatment with 40 ?g/mL rTCS resulted in a 78% decrease at the DNMT1 mRNA expression.Conclusion rTCS could reverse promoter hypermethylation and re-activate the expression of p27 gene by inhibiting DNMT1 expression in HeLa cells,which indicates its potential use in cancer therapy.

Abstract BACKGROUND: Calcium dobesilate (calcium dihydroxy-2, 5-benzenesulfonate) has been widely used to treat chronic venous insufficiency and diabetic retinopathy, especialy many clinical studies showed that calcium dobesilate as vasoprotective compound ameliorates renal lesions in diabetic nephropathy. However, there are few literatures reported calcium dobesilate in the treatment of chronic renal alograft dysfunction after renal transplantation. OBJECTIVE:To observe the efficacy and safety of calcium dobesilate on chronic renal dysfunction after renal transplantation. METHODS:A total of 152 patients with chronic renal alograft dysfunction after renal transplantation were enroled from the Military Institute of Organ Transplantation, Changzheng Hospital, Second Military Medical University of Chinese PLA. They were randomly divided into the treatment group (n=78) and the control group (n=74). Patients in the treatment group received 500 mg of calcium dobesilate three times daily for eight weeks. Al patients were treated with calcineurin inhibitor-based triple immunosuppressive protocols and comprehensive therapies. RESULTS AND CONCLUSION: For patients receiving calcium dobesilate, serum creatinine, blood urea nitrogen and uric acid decreased significantly at two weeks after treatment and maintained a stable level (P < 0.05). However, serum creatinine and blood urea nitrogen returned to the original level soon after drug withdrawal. No significant difference was observed in blood cel count, liver function, blood lipids, electrolytes, blood pressure and 24-hour urine output between the two groups before and after therapy (P > 0.05). Administration of calcium dobesilate did not change the general condition of patients with renal insufficiency, nor did it affect blood concentrations of the immunosuppressive agents. Calcium dobesilate may help to delay the progress of graft injury in patients with chronic renal graft dysfunction by conjugating with creatinine, ameliorating the impaired microcirculation and its antioxidant property. The decline in serum creatinine aleviates patients’ anxiety and concern arising from the elevation of creatinine. However, the negative interference with serum creatinine caused by calcium dobesilate should be cautious in order to avoid misjudgment of patients’ condition.

Objective To observe the effects of whole body γ-ray radiation on hematopoiesis and cytokines related to T cell subsets in mouse,to detect the expression of transcription factors of splenic T cell subsets,and to investigate the correlation between hematopoiesis injury and abnormal immune function.Methods Totally 50 BALB/c mice were divided into radiation group and blank control group with the random number table method.The former group were given 5.5 Gy 60Co γ-ray radiation on whole body and another received sham radiation.The numbers of white blood cells and platelets of radiation group were counted at 4,8,12 and 20 d after radiation,and these numbers of blank control mice were counted only at 20 d.Hematopoietic tissue proliferation was evaluated by biopsy sections of mice femur.The contents of Th1,Th2,and Th17 in peripheral blood were detected with cytometric bead array (CBA).The expressions of T-bet/GATA-3 and RORγt/Foxp3 proteins related to the differentiation of T cell subsets in spleen tissue were measured by Western blot.Results The numbers of white blood cells and platelets of radiation group mice were reduced obviously (t WBC =18.48,15.72,9.79,3.30; t PLT =22.52,19.74,11.78,4.70,P ＜ 0.05) compared with blank control group.Biopsy sections showed that bone marrow hematopoietic cells of the radiated mice were less than those of blank group,and adipocytes became more.At 8 d,the marrow suppressions were more obvious than those at 20 d.Serum contents of Th1 cytokines IFN-γ,TNF-α and Th2 cytokines IL-4,IL-6 in the radiation group were higher than those in the blank control group at 8 and 12 d(t IFN-γ =2.93,3.36,t TNF-α =6.09,8.11,6.43,4.49,tIL-4 =4.49,3.18,t IL-6=5.11,8.67,6.67,8.55,P＜0.05).IL-17A secreted mainly by Th17 cells was also higher than the blank (t =3.68,6.24,5.32,4.06,P ＜ 0.05).Compared with the blank control group,the expression of T-bet protein increased significantly (t =5.64,2.75,3.56,4.65,P ＜ 0.05),and the expressions of GATA-3,RORγt,and Foxp3 proteins decreased at 4,8 and 12 d except the RORγt at 20 d (tRORγt =6.79,4.31,4.47,tGATA-3 =3.88,8.06,2.84,3.23,tFoxp3 =10.00,8.06,2.89,5.93,P＜ 0.05).Conclusions 5.5 Gy whole body γ-ray radiation inhibits bone marrow hematopoiesis of BALB/c mice and makes the differentiation and function of T cells to be abnormal,which may be associated with bone marrow hematopoiesis obstacle.

Objective By analyzing and commentating the current research situation of recycling of residues in China, to provide reference for correlational research in future. Methods By taking periodical literature and national patent literature named residues at home and abroad as sample, using content analysis approach, the thesis conducts researches and analysis by computer statistical function. Results The literature mainly distributed in such branches as organic chemical industry, gardening, animal husbandry and animal medicine. The research involves residues and feedstuff, edible mushrooms, fertilizer, and analysis and application of the ingredients of residues. The types of residues mainly include Radix Liquorice, Radix Salviae Miltiorrhizae and brag-zhun, etc. And more than ten kinds of technologies of processing and curing residues were involved. Conclusion Research of recycling of residues in China is insufficient, the difficulty lies in the recycling of antibiotic residues. There will be a bright prospect in resource utilization of residues.