Biological performances of Ni-Cr porcelain alloy are highly correlated with released metallic ions. Released metal ions from Ni-Cr porcelain alloy, particularly Ni, Be can induce inflammation of the adjacent periodontal tissue and oral mucosa. In vitro evidence has indicated that the immune response can be altered by various metal ions. Allergic reactions due to metallic dental restorations have been documented. Ni has especially been identified as being highly allergenic. The cytotoxicity and corrosion level of Ni-Cr porcelain alloy is increased after recasting. The Ni-Cr porcelain alloy produced according to technology requirements has good biological safety. Ni-Cr porcelain alloy released a few of metal ions which might induce allergy and density of adjacent periodontal tissues, for the stimulation effect of these metal ions. There is no evidence to suggest that Ni-Cr porcelain alloy restorations has systemic toxicity or carcinogenic/genotoxic effect to human.

A red pigmant, procligiosin, have been isolated from the metabolite of germ pseudomonas sp. collected from the Dayawan Bay. Its structure was established on the basis of the spectral method.

Objective To investigate the effects of cinobufacini on TGF-β1-induced epithelial-to-mesenchymal transition of human colorectal carcinoma cells in vitro.Methods The cultured colorectal carcinoma cell line(SW480) was divided into the control group,TGF-β1 (10 ng/mL) individual treatment group and co-treatment groups with TGF-β1 (10 ng/mL) + cinobufacini (2.5,5,10,20,40,80 mg/mL),which were cultured in vitro for 48 h.The proliferation of the cells were measured by CCK8 assay.The morphological changes were observed by inverted phase contrast microscope.The ability of cell invasion and migration was detected by Transwell assay.The mRNA and protein expressions of E-cadherin and Vimentin were detected with QRT-PCR and Western Blot.Results (1)Compared with the TGF-β1 (10 ng/mL) individual treatment group,TGF-β1 (10 ng/mL) + cinobufacini (10,20,40,80 mg/mL) co-treatment groups significantly had significantly proliferation inhibitory effect on SW480 (P＜0.05).(2) Compared with the normal control group,TGF-β1 individual treatment group and TGF-β1 (10 ng/mL) + cinobufacini(2.5 mg/mL) group exhibited classical mesenchymal phenotype,while the TGF-β1 (10 ng/mL) + cinobufacini (5 mg/mL) co-treatment group showed classical epithelial phenotype.(3) The ability of invasion and migration in the TGF-β1(10 ng/mL)+ cinobufacini(2.5,5 mg/mL) co-treatment group were significantly weakened compared with the TGF-β1 individual treatment group (P＜0.01).(4) QRT-PCR and Western Blot results indicated that compared with the normal control group,the Vimentin expression in the in the TGF-β1 individual treatment group was significantly increased and the E-cadherin expression was significantly decreased.Furthermore,compared with the TGF-β1 individual treatment group and control group,the Vimentin expression level in the TGF-β1 (10 ng/mL) + cinobufacini (2.5,5 mg/mL) groups was significantly decreased and E-cadherin expression was significantly increased.Conclusion Cinobufacini can inhibit TGF-β1-induced cell proliferation in human colorectal carcinoma SW480 cells,and its mechanism may be related with promoting E-cadherin expression increase,meanwhile decreasing the vimentin expression,thus inhibiting the EMT process induced by TGF-β1.

OBJECTIVE To investigate the value of screening hospital urinary tract infection with UF-100 automated urine analyzer. METHODS It was to count the bacteria and white blood cells in 422 urine specimens with UF-100 as well as to culture the specimens quantitatively.Then the sensitivity and specificity of UF-100 counts and the correspondence of the two methods were evaluated with Yerushalmy mode. RESULTS Compared with the culture results,UF-100 showed a sensitivity of 81.5%,specificity of 63.9%,positive predictive value of 29.1%,negative predictive value of 95.0%,false positive rate of 30.5%,false negative rate of 2.8% and an accuracy of 67.2%. CONCLUSIONS The UF-100 is excellent in analyzing urine specimens,and its bacteria counts can be a valuable indicator in screening hospital urinary tract infection.

BACKGROUND:Previous studies show that the fracture resistant force of endodonticaly treated teeth can be improved by post. But this idea has been controversial in recent years. Many scholars believe that the root canal preparation might weaken dental root the post increases the risk of tooth fracture. OBJECTIVE: To evaluate the fracture resistance ability of severe wedge-shaped-defect premolar to oblique loading, which was restored with fiber reinforced composite posts by different therapy methods. METHODS:A total of 50 human maxilary premolars were randomly divided into five groups, with ten teeth in each group. They were given folowing treatments: Group A: 10 untreated premolars; Rest 40 premolars of Groups B, C, D and E were prepared 1/3 bucco-lingual distance for artificial severe wedge-shaped defects at the buccal cervix. Group B: untreated severe wedge-shaped defects premolars; Group C: severe wedge-shaped defects premolars were endodonticaly treated, remaining dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect; Group D: severe wedge-shaped defects premolars were endodonticaly treated, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect, and then covered with ful metal crown; Group E: severe wedge-shaped defects premolars were endodonticaly treated, removing dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, restored with LuxaCore composite resin, and then covered with ful metal crown. Fracture resistance of each specimen was measured in each group. RESULTS AND CONCLUSION: The fracture strength of each group were Group A (1 002.69±147.62) N, Group B (439.28±66.34) N, Group C (958.30±101.23) N, Group D (1 207.09±143.48) N, and Group E (1 056.44±139.30) N. Group D had the highest fracture strength (P < 0.01), while Group B had the lowest fracture strength (P < 0.01). There were no significant difference among the fracture strength of Group A, Group C and Group E. Our findings indicated that the fracture resistance of the severe wedge-shaped defected premolar can be improved by fiber reinforced composite post and dentin above wedge shaped defect remained.

Objective To evaluate clinical outcome in postoperative patients with advanced gastric cancer treated with concurrent chemotherapy and dendritic cells (DCs) vaccine as well as alteration of immune function. Methods Sixty-four postoperative patients with advance gastric cancer were divided into control group and DC vaccine group, In control group, 38 patients were treated with LCH regimen consisted of 5-fluorouracil 0.75 g/d_(1-5) and oxaliplatin 0.2 g/d_1. In DC vaccine group,blood sample was obtained from 26 patients who were followed by LCH regimen treatment next day.One week after the chemotherapy, patients were immunized with DC vaccine for 2 times at interval of one week. The second cycle was performed after 28 days. The percentages of T lymphocytes and natural killer (NK) cells and cytokine levels before and after treatment were compared between two groups. The therapeutic effects (including no remote metastasis and enlarged lymph nodes in cavity and/or tumor reduced in volume) were also evaluated. Results The concentrations of T lymphocytes (CD3~+ and CD4~+ ), NK cells, interleukin (IL)-2, IL-12 and interferon-γ in DC vaccine group were significantly increased after vaccination compared with those before vaccination (P＜0.05), and even higher than those in control group (P＜0.05). The effective rate was higher in DC vaccine group (80. 76%) than that in control group (68.42%) with significant difference (P＜0. 05). The side effects of chemotherapy such as the decreased peripheral white blood ceils and immune cells were less serious in DC vaccine group compared with control group (P＜ 0.05), while the uncomfortable incidence of gastrointestinal tract and peripheral neuritis showed no significant difference between two groups (P＞0.05). Conclusions Application of concurrent chemotherapy and DC vaccine in patients with advanced gastric cancer after surgical treatment may achieve a short-term efficacy, meanwhile it can reduce the side effects induced by chemotherapy.

Objective To explore the clinical curative effect of arthroscope adjunctive treatment in patients with posterior cruciate ligament(PCL)rupture,and investigate the biomechanical attribute of meniscus posterior horn. Methods The clinical data of 49 posterior cruciate ligament rupture patients having underwent arthroscope adjunctive posterior cruciate ligament prothesis were retrospectively analyzed. The patients were followed up at least 6 months, and functional recovery of the knee was assessed. Biomechanical study was completed,which included 2 healthy adult knee specimens. The specimens were tested under 200 N loads at the condition of complete or incised posterior cruciate ligament to measure the strain of meniscus posterior horn.Results The operation time was 1.31-2.08 (1.56 ± 0.81)h,postoperative drainage volume was(69 ± 24)ml,and length of stay in hospital was 6-11(7.56 ± 2.18)d.The patients were followed up for 6-13(8.7 ± 2.9)months,and the Lysholm knee function score was 84 - 96 (91.40 ± 5.18) scores. There were no complications such as ligament reinjury,venous thrombosis and joint stiffness in all patients.The biomechanical test result showed that the strain variables of meniscus posterior horn in different angle(0°,30°,60°and 90°)were significantly increased after posterior cruciate ligament rupture:(27.51 ± 2.38)°vs.(18.12 ± 3.24)°,(41.23 ± 2.81)°vs. (12.58 ± 1.57)°,(67.56 ± 1.68)°vs.(24.56 ± 1.74)°and(79.61 ± 1.16)°vs.(34.65 ± 3.24)°,and there were statistical differences (P<0.05). The strain variable of meniscus posterior horn in 90° was significantly higher than that of other angles, and there was statistical difference (P<0.05). Conclusions Posterior cruciate ligament rupture can be treated with arthroscopy, which proves to be safe and effective.It can reduce the strain variable of meniscus posterior horn,which has benefit on knee joint.

The structural gene encoding mature peptide of extracellular ? amylase was amplified from the genome DNA of hyperthermophilic archaeon Pyrococcus furiosus by PCR The recombinant plasmid pUC19 amy was constructed by inserting the amplified segment into vector pUC19 The recombinant vector pYX212 amy was constructed by ligate the heterogeneous fragment of pUC19 amy into the multiple cloning site of pYX212, an expression vector of yeast Saccharomyces cerevisiae W303 A1 were transformed with pYX212 amy by electroporation The transformant expressed the activity of the thermophilic ? amylase successfully The recombinant enzyme has the similar enzymatic properties as the extracellular ? amylase produced by Pyrococcus furiosus : it shows an enzymatic activity optimum at pH 5 0, and its optimal temperature for enzymatic activity is about 90℃, more than 50% of its initial enzymatic activity is still detectable after it was incubated at 121℃ for 30 minutes

Objective To investigate the effects of the exercise training on the cognitive function ,choline acetyltransferase (ChAT) activity and acetylcholinesterase (AchE) activity in stroke prone spontaneously hypertensive rat (SHR/SP) vascular de-mentia model .Methods 30 male SHR/SP rats were randomly divided into sham operation group ,model group and exercise group (n=10) .The VD model was established by the fractional ligation of bilateral carotid artery (2-VO) .The sham operation group and the model group were given the normal feeding without intervention after operation ;the exercise group adopted the treadmill exer-cise(DSPT-1) for 8 weeks .After the exercise ,the Morris maze test was conducted for evaluating the cognitive function in each group .The rats were finally killed for detecting the ChAT activity and AchE activity of hippocampus .Results In the positioning navigation training ,the latency period of the sham operation group was significantly short than that of the exercise group and the model group ,but the latency period of the exercise group was obviously short than that of rats in the model group (P<0 .05);in the spatial exploration test ,the rats in the sham operation group had more frequency of crossing platform than the other two groups ,the exercise group had more frequency of crossing platform in platform quadrant than the model group (P<0 .05);the exercise training could increase the ChAT activity and lower the AchE activity of hippocampus .Conclusion The exercise training can improve the function of hippocampal cholinergic system in SHR/SP and then increase the cognitive ability .

The possibility of rats mesenchymal stem cells (MSCs) modified with murine hyperpolarization-activated cyclic nucleotide-gated 2 (mHCN2) gene as biological pacemakers in vitro was studied. The cultured MSCs were transfected with pIRES2-EGFP plasmid carrying enhanced green fluorescent protein (EGFP) gene and mHCN2 gene. The identification using restriction enzyme and sequencing indicated that the mHCN2 gene was inserted to the pIRES2-EGFP. Green fluorescence could be seen in MSCs after transfection for 24-48 h. The expression of mHCN2 mRNA and protein in the transfected cells was detected by RT-PCR and Western blot, and the quantity of mHCN2 mRNA and protein expression in transfected MSCs was 5.31 times and 7.55 times higher than that of the non-transfected MSCs respectively (P<0.05, P<0.05). I(HCN2) was recorded by whole-cell patch clamp method. The effect of Cs(+), a specific blocker of pacemaker current, was measured after perfusion by patch clamp. The results of inward current indicated that there was no inward current recording in non-transfected MSCs and a large voltage-dependent inward and Cs(+)-sensitive current activated on hyperpolarizations presented in the transfected MSCs. I(HCN2) was fully activated around -140 mV with an activation threshold of -60 mV. The midpoint (V(50)) was -95.1+/-0.9 mV (n=9). The study demonstrates that mHCN2 mRNA and protein can be expressed and the currents of HCN2 channels can be detected in genetically modified MSCs. The gene-modified MSCs present a novel method for pacemaker genes into the heart or other electrical syncytia.