OBJECTIVEWe aim to evaluate the cytotoxicity and antibacterial effects of Silagum-Comfort (SLC) silicone-based soft liner varnish containing Ag/TiO2 in vitro.

METHODSSilicone-based liner circular specimens, with a diameter of 10 mm and a thickness of 2 mm, were created and divided into six groups randomly. Ag/TiO2 was incorporated into the SLC varnish based on the agent/material weight rate of 0, 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%. The mixed varnish was used to polish the SLC specimens. Antibacterial specimens (ATSLC) were created. Methyl thiazolyl diphenyl-tetrazolium bromide assay method was used to evaluate the 3T3 cell cytotoxicity of ATSLC in vitro. Surface roughness (Ra) measurements of ATSLC were obtained. The antibacterial effect of ATSLC on Candida albicans was examined using the pelliclesticking method.

RESULTSThe cytotoxicity of ATSLC was graded from 0 to 2. The Ra of ATSLC increased when Ag/TiO2 agent concentration increased. However, the differences were not statistically significant compared with the 0 group. With increasing Ag/TiO2 concentration, the antibacterial agent concentration and the antibacterial rate of ATSLC also increased. When the Ag/TiO2 antibacterial agent concentration reached 2.0% and 2.5%, the antibacterial rate increased to 97.5% and 96.5, respectively.

CONCLUSIONVarnish containing Ag/TiO2 has excellent antibacterial effect and can significantly improve the antibacterial effect of silicone-based soft liner.

Anti-Bacterial Agents ; Candida albicans ; In Vitro Techniques ; Paint ; Silicones ; Titanium

0.05).There were significant differences between groups A and C(P

AIM:To discuss the technique for preparing high-purity solanesol from tobacco. METHODS:The pre-treated tobacco leaves were extracted with mixed solvent of petroleum ether and ethanol,and saponified to obtain solanesol extract; The solanesol extract got through redissolution and dewaxing,then crystallized in the temperatare of -18 ℃; Finally purified by macroporous resin(YPR-Ⅱ,D-1300,HZ-816,HZ-802). RESULTS:The ratio of mixed solvent of petroleum ether and ethanol was 1 ∶ 4,ratio of liquid to materials was 1 ∶ 12,solanesol purity was about 32% after saponification,then crystallization made the purity up to 63. 4% ,finally purified through macroporous resin,the solanesol purity reached above 93. 6%. CONCLUSION:Through the general solvent extraction,saponification,crystallization and macroporous resin adsorption process,the solanesol purity of the product reaches higher than commonly expected values.

AIM: To provide experimental evidence for gene therapy of thrombophilia disease, we constructed the eukaryotic expression plasmid with human thrombomodulin (hTM) gene and observed the alteration of hTM expression on the surface of human umbilical vein endothelial cells (HUVECs) with and without the reconstructive plasmid. METHODS: The whole expressive fragment of hTM gene was amplified by PCR from human genome. Both hTM gene and pcDNA3.1(+)/neo empty vector was digested by HindⅢ and EcoRⅠ. Two digested fragments were ligated into pcDNA3.1/hTM with T_4DNA ligase. After identifying, the reconstructive plasmid transfected into HUVECs using lipofectin. The hTM antigen on the HUVECs was detected by immunohistochemistry. RESULTS: The hTM reconstructive plasmid was confirmed by double endonuclease redigesting and sequencing. About 10% HUVECs were transfected by pcDNA3.1/hTM plasmid with lipofectin and the high-level hTM was detected on the transfected cells. CONCLUSION: We constructed the pcDNA3.1/hTM plasmid successfully, and it could be expressed on the HUVECs. [

Objective To study the effect of apolipoprotein A5 gene polymorphism on the metabolic syndrome and cardiovascular events.Methods A total of 200 patients with metabolic syndrome include 100 cases of unconsolidated cardiovascular events (MS-1 group) and 100 cases of combined cardiovascular events (MS-2 group); 100 cases of healthy people were used as control group.Apolipoprotein A5 serum concentration was detected by ELISA in each group.PCR-RFLP method was used to determine ApoA5-1131T ＞ C gene polymorphism.The automatic analyzer was used to measure fasting plasma glucose (FPG).Results The MS-1-group ApoA5 Serum concentration was significantly lower than the control group [(96.68 ± 18.09) ng/ml vs (128.32 ±23.78) ng/ml,t =10.59,P ＜0.01] ; the MS 2 groups ApoA5 serum concentrations was significantly lower than the MS-1 group [(87.67 ± 17.09) ng/rnl vs (96.68 ±18.09) ng/ml,t =3.62,P ＜0.01] ; and ApoA5-1131C genotype frequency in MS-2 group and the MS-1 group was significantly higher than the control group (39.4％ ＞ 30％ ＞ 16.5％,P ＜ 0.05).Conclusions ApoA5 serum concentrations in patients with metabolic syndrome and cardiovascular events were significantly reduced,ApoA5-1131 C was related to the metabolic syndrome and cardiovascular events.

Objective To explore the feasibility of artificial silastic framework(SF)in repair of large area of tracheal wall defects.Methods Twenty healthy adult dogs with tracheal defects for 2.5 cm?6.0 cm-3.0 cm?6.0cm were randomly and equally divided into experimental group(repaired with SF combined with sternohyoid fasciae)and control group(repaired with T-silastie tubule combined with sternohyoid fascial flap).After the operation,the animals were sacrificed at the 4th,8th,16th,24th, and 48th weeks respectively for harvesting the tracheae that were used for tracbeoscopically observing in- flammatory reaction of the repaired defect area and light microscopically observing epithelium healing on the repaired defect area.Results In the experiment group,the repaired trachea was smooth,without proliferation of granulation;and at the 8th week,the repaired defect area was covered with epithelial cells,with good functional recovery of respiration,phonation and deglutition.In the control group,there was obvious proliferation of granulation on the tracheal surface near anterior and posterior ends of T-silas tic tubule.The animals were under asphyxia to die with extraction of T-silastic tubule.Conclusions SF has excellent tracheal skeletal function.In the meantime,SF combined with sternohyoid fasciae is a simple but effective method for repair of large area of tracheal wall defects.

OBJECTIVETo detect HBV DNA and its genotypes.

METHODSThe 6 isoforms of HBV DNA was detected out using of different probes by Polymerase Chain Reaction and Nucleic Acid hybridization.

RESULTSOf 150 HBV DNA positive patients who lived in Shenzhen, 50 samples (33%) are type B, 36 samples (24%) are type C, 13 samples (9%) are type D, 3 samples is type F, 1 sample is type A, 48 samples (31%) are mixed type. The ALT value was significantly higher in genotype B than in genotype C. HBe positivity were higher in genotype B than genotype C. HBeAg positivity were higher in genotype C than in genotype B. There are not obvious relations between genotype and age or sex.

CONCLUSIONIn the detected samples, the major genotype of HBV DNA is type B, several are type C, D. The type E haven't been found. There are some relations between all kinds of genotypes and the severity of hepatitis B.

Adult ; DNA, Viral ; analysis ; Female ; Genotype ; Hepatitis B ; virology ; Hepatitis B virus ; classification ; genetics ; Humans ; Male ; Middle Aged ; Polymerase Chain Reaction

OBJECTIVETo investigate the effects of cyclosporine A (CsA), a powerful inhibitor of mitochondrial permeability transition pore (MPTP), on pneumocyte apoptosis, the release of cytochrome C and the activity of caspase-3 after lung ischemia/reperfusion, and explore the mechanisms.

METHODSSingle lung in situ ischemia/reperfusion animal model was used. 30 SD rats were randomly divided into three groups (n = 10): sham (S) group, ischemia/reperfusion (I/R) group and cyclosporine A (CsA) group. Apoptosis of pneumocyte was assessed by TUNEL method, cytochrome C (CytC) in cytoplasm was detected by immunohistochemistry techniques, and the activity of caspase-3 was measured with spectrophotometer.

RESULTSThe content of CytC in cytoplasm, the activity of caspase-3, and the value of apoptosis index (AI) in ischemia/reperfusion group were evidently higher than that in S group (P < 0.01). CsA suppressed apoptosis as well as CytC release and caspase-3 activity (P < 0.01).

CONCLUSIONCsA can prevent the release of cytochrome C, block the apoptosis of pneumocyte accordingly maybe by closing the MPTP.

Alveolar Epithelial Cells ; cytology ; drug effects ; Animals ; Apoptosis ; drug effects ; Caspase 3 ; metabolism ; Cyclosporine ; pharmacology ; Cytochromes c ; metabolism ; Lung ; blood supply ; pathology ; Male ; Rats ; Rats, Sprague-Dawley ; Reperfusion Injury ; metabolism ; pathology

BACKGROUNDTo evaluate the relationship among indoor air pollution, depression and oncogenesis of lung cancer.

METHODSAn 1:3 matched case-control study was carried out. Conditional logistic regression was applied to process the data.

RESULTSAfter some confounding factors were adjusted, the ORs increased 122% and 113% for the amount of coal using ≥46kg/m² and heating by coal stove respectively. The ORs elevated more than five-folds for disharmony and rupture of marriage, difference of accommodation and acclimation by oneself and human relationship respectively. The risk of lung caner obviously increased for frequent exposure to indoor cooking smoke combinated with depressed mood or mental scar respectively.

CONCLUSIONSThe indoor air pollution, depression and mental scar are important factors of oncogenesis of lung cancer.

The selective side-chain cleavage of phytosterol to 4-androstene-3,17-dione(4-AD)and 1,4-androstadiene-3,17-dione(ADD)by Mycobacterium sp.was described.Because of the similarity in chemical structure between 4-AD and ADD,it is difficult to separate them from the fermentation broth.So far,it has been verified that the ADD can be produced by dehydrogenation of 4-AD.In this reaction,3-Ketosteriod-1-Dehydrogenase(ksdD)plays an important role.The gene knocking out method was used to solve the problem.Partial sequence of ksdD was obtained by PCR which was 631bp in length.Then,a targeting vector pUC19-MK was constructed,which was electroporate into the original strain Mycobacterium neoauru.The method of homologous recombination was used to knock out ksdD gene located in the chromosome of Mycobacterium neoauru.In this way,ksdD would lose its enzyme activity.In the result,5 transformants were screened.The experiments of steroid transformation by the transformants were carried out.The productivity of 4-AD reached 17.52% after 144h,which is 192% higher than the original strain.Meanwhile,the productivity of ADD reached 6.12%,which is 89.9% lower than the original strain.