Objective:To evaluate the anti-corrosion property of Ti-Zr alloy fabricated by laser solid forming technic in artificial saliva.Method:The corrosive behavior of Ti-Zr alloy fabricated by laser solid forming was studied by potentiadynamic polarization technique in artificial saliva at 37 ℃(pH=6.8).Ti-Zr alloy formed by casting was applied as the control.With the polarization curves given by the electrochemical corrosive measure system and the picture of corrosive plane given by SEM, the corrosive property of the Ti-Zr alloy were analyzed.Results:Ti-Zr alloy fabricated by laser solid forming showed more relatively positive corrosion potential, smaller corrosion current density and lower passive potential, and did not show any evidence of corrosive phenomena.Conclusion:Ti-Zr alloy fabricated by laser solid forming has good corrosive resistance in oral circumstances.

0.05), however, NH3-N among different sampling sites showed the significant difference (P

Objective To study the influence of Erythropoietin(Epo) on cognition,brain protection and ?-tubulin expression in hippocampus in rat models of vascular dementia(VD).Methods VD rat models were established by two-vessel occlusion and salium nitroprusside.Epo group was treated by intraperitoneal injection of Epo.Morris labyrinth test was performed to detect the cognition of rats.Nissle staining and ?-tubulin immunohistochemistry staining were used to observe the cellular morphous.Western blot method was used to assay ?-tubulin contents in hippocampus.The results of Epo group were compared with those of VD models(VD group) and sham-operative group.Results Compared with VD group,Epo group had significantly shorter the escaping latency of Morris labyrinth(excepting the first day of the test)(all P

ObjectiveTo observed the clinical result of 3 kinds of commonly used depressor in Intensive Care Unit (ICU) and attend to the main point in nursing.MethodsNitroglycerin, sodium nitroprosside and urapidil hiydrochloride were used among 60 patients with perioperative hypertension in ICU respectively.ResultsSodium nitroprosside showed obviously depressed result, but needs to be observed tightly. Nitroglycerin and urapidil hiydrochloride depressed the blood pressure gentlely, and were suitable to old people particularly.ConclusionThe nurse can carry on corresponding clinical observation and nursing according to the pharmacology function of 3 kinds of medicines.

This study was performed to prepare immobilized β-glucosidase and snailase, then optimize and compare the process conditions for conversion of icariin. Immobilized β-glucosidase and snailase were prepared using crosslink-embedding method. The best conditions of the preparation process were optimized by single factor analysis and the properties of immobilized β-glucosidase and snailase were investigated. The reaction conditions including temperature, pH, substrate ratio, substrate concentration, reaction time and reusing times of the conversion of icariin using immobilized β-glucosidase or snailase were optimized. Immobilized β-glucosidase and snailase exhibited better heat stabilities and could remain about 60% activity after storage at 4 degrees C for 4 weeks. The optimized conditions for the conversion of icariin were as follows, the temperature of 50 degrees C, pH of 5.0, enzyme and substrate ratio of 1 : 1, substrate concentration of 0.1 mg x mL(-1), reaction time of 6 h for β-glucosidase and 2 h for snailase, respectively. In 5 experiments, the average conversion ratio of immobilized β-glucosidase and snailase was 70.76% and 74.97%. The results suggest an effect of promoted stabilities, prolonged lifetimes in both β-glucosidase and snailase after immobilization. The immobilized β-glucosidase and snailase exhibited a higher conversion rate and reusability compared to the free β-glucosidase and snailase. Moreover, the conversion rate of immobilized snailase was higher than that of immobilized β-glucosidase. The process of icariin conversion using immobilized β-glucosidase and snailase was moderate and feasible, which suggests that immobilized enzymes may hold a promise for industrial usage.
Enzymes, Immobilized ; chemistry ; Flavonoids ; chemistry ; Hydrolysis ; Temperature ; beta-Glucosidase ; chemistry

_ Objective_ To observe the effect of vaspin on the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells in rats and its potential mechanism. Methods Bone marrow mesenchymal stem cells( BMSCs) from 4 weeks aged rats were isolated and cultured. The BMSCs were treated with osteogenic induction medium and different concentrations of vaspin and Wnt signaling pathway inhibitor DKK1. The proliferation was detected by CCK8 method at 24, 48, 72 h. After 7 days, the mRNA expressions of ALP, Runx2,β-catenin were detected by realtime qPCR. The expression levels of Runx2 and β-catenin protein were detected by Western blot. After 21 days, alizarin red stained mineralized nodules and quantitative detection were performed. Results Vaspin had no effect on the proliferation but promoted the expression of osteogenic differentiation gene ALP, Runx2, and also increasedβ-catenin mRNA and expression of Runx2 and β-catenin protein. Mineralized nodules were brown and increased, OD value of vaspin group was higher than control group. After adding the DKK1, the expression of ALP, Runx2,β-catenin mRNA and Runx2, β-catenin protein were significantly decreased(all P<0. 05). Conclusion Vaspin can promote BMSCs into osteogenic differention through the Wnt/β-catenin signaling pathway.

Glaucoma is an irreversible cause of blindness,and it does serious harm to visual functions.Symptoms of glaucoma,visual impairment,a variety of symptomatic treatment and adverse reactions of drugs result in great obstacles and reduce quality of life.Preventive treatment intervenes glaucoma at an early stage by providing patients with guidance on therapies,diet and daily life,which are effective and may effectively improve their quality of life.

ObjectiveTo observe the change of blood phosphorus and N-terminal pro-brain natriuretic peptide(NT-proBNP) in patients with severe acute organophosphorus pesticide poisoning (AOPP)and explore their clinical significance.MethodsSeventy-eight severe AOPP patients were selected and divided into dead group (54 cases) and survival group (24 cases).NT-proBNP and blood phosphorus were examined when the patients were just hospitalized,and after 1,2,4 d and when they were turn out from ICU or before the patients dead.ResultsComparing with survival group,blood phosphorus and NT-proBNP of dead group had no significant difference when the patients were just hospitalized(P＞ 0.05 ).After 1,2 and 4d NT-proBNP of dead group [ ( 1986.5 ± 24.9),(3568.2 ± 56.9),(7829.0 ± 64.3 ) ng/L ]was higher than that of survival group [ ( 1068.4 ± 20.2),(986.6 ± 16.4),(943.7 ± 14.6) ng/L,P ＜ 0.05 or ＜ 0.01 ],while blood phosphorus was significant lower than that in survival group [ ( 1.22 ± 0.13 ),(0.81 ± 0.10),(0.58 ±0.07 ) mmol/L vs.( 1.53 ± 0.16),( 1.48 ± 0.13 ),( 1.46 ± 0.14 ) mmol/L,P ＜ 0.05 or ＜ 0.01 ].NT-proBNP of dead group increased and blood phosphorusreduced gradually by time extending (P ＜ 0.05).NT-proBNP was lower when patients were turn out from ICU than that when the patients were just hospitalized [ (327.5 ±12.3) ng/L vs. (1023.3 ± 18.8) ng/L,P ＜ 0.05].Blood phosphorus had no difference at all time points in survival group (P ＞ 0.05 ).NT-proBNP was higher [ ( 31 486.5 ± 120.7) ng/L vs.(327.5 ± 12.3) ng/L,P ＜0.01 ]and blood phosphorus was lower [ (0.24 ± 0.03 ) mmol/L vs.( 1.57 ± 0.15 ) mmol/L,P ＜ 0.01 ]before death in dead group compared with those at the time turning out from ICU in survival group.Conclusions The value of NT-proBNP increased and blood phosphorus reduced gradually with disease progression.NT-proBNP and blood phosphorus were important factors reflecting the prognosis of blood AOPP patients.

Objective To investigate and analyze the expression of α-SMA and PCNA in abdominal aorta and renal artery in obstructive sleep apnea syndrome(OSAS)combined with hypertension rats. Methods 36 SD rats were randomly divided into normal control group and model group. The model group was subjected to intermittent hypoxia condition for 8h everyday. Rat tail artery pressure was monitored every week and all subjects were sacrificed at 12th week. The level of TNF-α, IL-6, IL-10 and hs-CRP expression in serum were measured by ELISA method. Immunohistochemical analysis was performed on α-smooth muscle actin (α-SMA) and proliferating cell nuclear antigen (PCNA). Results Compared with control group,model rats blood pressure increased significantly (P < 0.01) when exposed for 4 weeks under intermittent hypoxia condition,and reached the peak value of 186mmHg at 12 weeks. The level of TNF-α, IL-6 , IL-10 and hs-CRP in serum were higher than in control group (P < 0.01). Immunohistochemical staining showed that the expression of α-SMA in abdominal aorta decreased more significantly than control group (P < 0.05),while there was a stronger positive expression of PCNA in model group than those in control (P < 0.05). In addition,compared with control rats, model rats showed a higher expression of α-SMA and PCNA significantly in renal artery(P < 0.05). Conclusion The intermittent hypoxia condition could result in higher blood pressure,while the different expression of α-SMA and PCNA illustrate that high pressure show different reconstruction performance in different vascular,underlying different molecular mechanism.

Objective To investigate flow patterns at carotid bifurcation in vivo by combining computational fluid dynamics(CFD)and MR angiography imaging.Methods Seven subjects underwent contrast-enhanced MR angiography of carotid artery in Siemens 3.0 T MR.Flow patterns of the carotid artery bifurcation were calculated and visualized by combining MR vascular imaging post-processing and CFD. Results The flow patterns of the carotid bifurcations in 7 subjects were varied with different phases of a cardiac cycle.The turbulent flow and back flow occurred at bifurcation and proximal of internal carotid artery (ICA)and external carotid artery(ECA),their occurrence and conformation were varied with different phase of a cardiac cycle.The turbulent flow and back flow faded out quickly when the blood flow to the distal of ICA and ECA.Conclusion CFD combined with MR angiography can be utilized to visualize the cyclical change of flow patterns of carotid bifurcation with different phases of a cardiac cycle.