1.Effects of different polishing methods on surface roughness of pure titanium castings.
West China Journal of Stomatology 2006;24(3):214-230
OBJECTIVETo evaluate the effects of different polishing methods on surface roughness of pure titanium castings.
METHODS35 pure titanium castings were devided into 7 groups, used for control, mechanic polishing and electrolytic polishing, respectively. Surface roughness (Ra value) of each castings was measured with a profilometer. Surface microstructure was studied by a scaning electron microscopy, and the weight loss (Wt%) and height loss on unit area (H) before and after polishing was calculated.
RESULTSThe effects of mechanic polishing with aluminium oxide or chromium oxide were acceptable. Surface smoothness was improved with acid treatment followed by electrolytic polishing.
CONCLUSIONAluminium oxide and chromium oxide can be used in mechanic polishing of pure titanium castings, and improvement should be made on electrolytic polishing methods.
Aluminum Oxide ; Dental Polishing ; Materials Testing ; Surface Properties ; Titanium
2.Diagnosis and Treatment of Intestinal Neuronal Dysplasia
xiao-song, LI ; yan-xia, WANG ; jin-zhe, ZHANG
Journal of Applied Clinical Pediatrics 2004;0(11):-
Objective To investigate pathogenic factors,clinical characteristics,pathological changes in 6 patients with localized or disseminated intestinal neuronal dysplasia(IND).Methods The clinical retrospective study was performed in 6 cases with localized and disseminated IND.Results In 6 patients,constipation and partial intestinal obstruction were the major symptoms.Preoperatively,dia-gnoses were revaluated as intestinal stenosis in 2 cases,long sigmoid in 2 cases and long-segment aganglionosis and total gastrointestinal IND in the rest 2 cases,respectively.Exploratory laparotomy was performed on all these patients.Pathological study suggested that 4 of them were localized IND,on whom enterectomy and intestinal anastomosis were performed successfully.However,2 cases of disseminated IND died postoperatively.Conclusions Disseminated IND may be caused by congenital factors,while localized IND by the acquired factors which including intestinal obstruction,local ischemia or inflammation.The surgical interventions are effective for localized IND,and intestine transplantation might be prospective treatment for disseminated IND.
4.Research and Application of Portable Electron Video Equipment for Tracheal Intubatton
Zhe WEI ; Yunkui ZHU ; Yuebin XU ; Fujun LI ; Yongjiu XIAO
Chinese Medical Equipment Journal 2003;0(11):-
Objective To research the portable electron video equipment for tracheal intubatton in first aid. Methods According to the attributes of physiological bend and specialty of windpipe and gular of image, a horniness endoscopic of "C" model was designed with optical interface, CCD image transducer and small crystal display. It could quickly and visually lead tracheal intubatton through nonnasality. Results It was portable, visual, easily-operated. The rate of successful leading of tracheal intubatton is 97.8% . Conclusion It is especially suited to field battle, first aid, abrupt affairs, etc.
5.Simultaneous Determination of Asarinin, Prim-O-glucosylcimifugin and 5-O-Methylvisammioside in Xinqin Granules by HPLC
Xiaolong ZHANG ; Xiao SUN ; Si SUN ; Zhe LI
China Pharmacist 2014;(12):2027-2029
Objective:To simultaneously determine the contents of asarinin, prim-O-glucosylcimifugin and 5-O-methylvisammio-side in Xinqin granules. Methods:An HPLC method was used. The determination was performed on a ZORBAX Eclipse XDB-C18 col-umn(150 mm ×4.6mm,5 μm) with the mobile phase consisting of menthol (A)-water (B) with gradient elution. The flow rate was 1. 0 ml·min-1 . The column temperature was 30℃. The detection wavelength was set at 254 nm from 0 to 30 min and 287nm from 30 to 55 min. The injection volume was 10μl. Results:The linear range of prim-O-glucosylcimifugin, asarinin and 5-O-methylvisammio-side was 10.210-163.400 μg·ml-1(r=0.999 7),10.160-162.600 μg·ml-1(r=0.999 8) and 5.015-80.240 μg·ml-1(r=0. 999 8), respectively. The average recovery was 100. 30%(RSD=1. 6%, n=6),101. 53%(RSD=1. 1%,n=6) and 101. 12%(RSD=1. 2%, n=6), respectively. Conclusion: The method is simple and accurate, which can be used in the quality control of Xinqin granules.
6.Antioxidant response element activator protects motor neurons from selected death
Hui BU ; Chun-Yan LI ; Xiao-Yun LIU ; Zhe LI ; Bin LI ; Meng-Meng SUN
Chinese Journal of Neurology 2001;0(01):-
Objective To investigate the effects of antioxidant response element (ARE) activator- 5,6-dihydrocyclopenta[ C ]-1,2-dithiole-3-thione (CPDT) on organotypic spinal cord cultures and to study whether this activation can protect motor neurons from oxidative stress.Methods Organotypic spinal cord cultures were prepared using lumbar spinal cord slices from 8-day-old rat.Threo-hydroxyaspartate (THA) was continuously added into the culture medium for 3 weeks,which caused selective motor neuron death. Thus,the in vitro model of amyotrophic Lateral sclerosis (ALS) was established.15,30 ?mol/L of CPDT were added into the culture medium respectively.Ventral motor neurons survival was evaluated by immunohistochemical staining with monoclonal antibody SMI-32,a nonphosphorylated neurofilament marker. Ultrastructure was observed with electronic microscope.Results The pretreatment of organotypic spinal cord cultures with different concentrations of CPDT significantly increase the total number of ventral motor neurons (15?mol/L:(15.81?6.97) perexplant;30?mol/L:(16.25?6.74) perexplant respectively) compared with THA group ((5.31?5.76) perexplant) and the former had plentiful neurite extensions (n= 15,P
7.Sebaceous carcinoma of the eyelid:a clinicopathological study
Zhe ZHANG ; Bin LI ; Fei GAO ; Xiao-Lin XU ; Liao-Qing LI ;
Ophthalmology in China 1993;0(03):-
Objective To review the clinical and histopathological features,management and outcomes in 67 patients with seba- ceous carcinoma of the eyelid.Design Retrospective case series.Participants Sixty-seven cases of the sebaceous gland carcinoma were retrieved from the ophthalmology archives of Tongren Hospital between 1996 and 2005.Methods Clinical data of all patients were re- viewed from the charts.Pathology specimens were reviewed in all cases.Main Outcome Measure Presenting features,sites of origin, location,differentiation,management,histopathologic findings,and incidence of recurrence in 67 patients.Results A total of 36 female and 31 male patients were identified.The mean age at diagnosis was 59 years (range from 35 to 84).Initial clinical diagnoses elsewhere were sebaceous carcinoma (43.28%),chalazion (25.37%),basal cell carcinoma(7.46%).Initial histopathologic diagnoses were sebaceous carcinoma(79.10%),basal cell carcinoma(5.97%),squamous cell carcinoma(1.49%) and other or not available(4.48%).The initial treat- ment involved excisional techniques with reconstruction in 42 cases,anti-inflammatory in 12 cases,without any treatment in 10 cases. 61.19% cases presented the pagetoid invasion.Local recurrence developed in 58.21% and two died from metastatic sebaceous carcino- ma (8.70%).Regional lymph node excision was performed in 13.04% because of local metastases.Five year survival rate was 94.87%. Conclusions About 1/3 cases had not receive the right treatment at initial diagnosis eyelid.The recurrence rate of patients was still high.
8.CTGFsiRNA ameliorates retinal cells apoptosis in the streptozotocin-induced diabetic rat
Hong-Wei, YANG ; Xiao-Long, CHEN ; Zhe-Li, LIU ; Jie, LIU ; Li-Min, BU
International Eye Science 2010;10(5):827-831
·AIM: To detect the effect of CTGF on the apoptosis in the diabetic retina with small interfering RNAs (siRNA) targeting with CTGF. ·METHODS: A total of 60 rats were divided into six groups including control group, diabetic 4,8,12,16 weeks group, and interference group. Diabetic rats were induced by STZ intra-peritoneal. At 4, 8, 12, 16 weeks after diabetic setting up, retinas were obtained from control, diabetic rats and diabetic animals treated by intravitreal injection of CTGFsiRNA to suppress the expression of CTGF mRNA. Retinal cells apoptosis was detected by Tunnel staining and mRNA expression of CTGF was analyzed by RT-PCR.·RESULTS: The levels of CTGF and the apoptosis in the retinas of diabetic rats were significantly higher than those in the controls. Apoptosis occurred at 4 weeks after a diabetic model setting up, became serious with the diabetes developing, while CTGF elevated at 8 weeks. The cell apoptosis counts increased to 25.8cells/mm2 at 24 weeks of diabetes. SiRNA-mediated inhibition of CTGF mRNA resulted in a significant decrease in apoptosis. Significant correlations were found between CTGF and apoptosis in the retina.·CONCLUSION: These results suggest that CTGF might be involved in retinal cells apoptosis which is a characteristic of early diabetic retina. siRNA targeting CTGF seems to have the advantage of ameliorating retinal cells lost.
9.The establishment of chronic salpingitis model of New Zealand rabbits caused by Escherichia coli
Zicong FENG ; Zhao ZHANG ; Zhe LI ; Boyi FENG ; Siai CHEN ; Junyu LI ; Xiaomin XIAO
Chinese Journal of Comparative Medicine 2016;26(3):19-23
Objective To investigate the possibility of utilizing the mixed bacteria liquid and the Escherichia coli ( E.coli) liquid to establish the chronic salpingitis model of New Zealand rabbits, respectively.Methods Taken as the study object, the un-pregnant New Zealand rabbits (4~5 years old) were randomly divided into three groups: the normal group, the mixed bacteria experimental group and the E.coli experimental group.The trans-vaginal intrauterine intubation operation was performed for the injection of the mixed bacteria liquid and the E.coli liquid.Visual observation was to evaluate the gross pathological changes of the salpingitis and the pelvic cavity.HE staining and the light microscope were used to observe the micro-pathological changes of salpingitis.Results On the 15th day after modeling, increased pelvic effusion, dense peritoneal adhesion, interstitial hyperplasia and infiltration of lymphocytes were observed in both experimental groups. Conclusion Through the trans-vaginal intrauterine intubation operation, the chronic salpingitis model of New Zealand rabbits could be successfully established either by using the mixed bacteria liquid or by using the E.coli liquid.
10.Comparative Study on Computed Radiogram (CR) and Conventional Chest Film in Diagnosing Lung Cancer
Huimin LI ; Xiangsheng XIAO ; Wangdong ZHU ; Zhaoxia XU ; Zhe LI ; Chaoyang JIA
Journal of Practical Radiology 1992;0(11):-
Objective To determine the efficacy of computed radiogram (CR) of chest in the diagnosis of pulmonary carcinoma.Methods There were 56 cases of pulmonary carcinoma confirmed by pathology including 34 cases of central pulmonary carcinoma and 22 cases of periphral pulmonary carcinoma in this paper.Four kinds of chest CR images (plain CR,wide CR,HE-CR and LE-CR) and two kinds of chest CR tomogmphic images (plain CR tomogram and HE-CR) were compared with conventional X-ray (CXR) and conventional tomogram (CTomo)respectively in showing normal structures and abnormal shadowes tomogram.Results The normal structure were displayed more clearly by CR than by CXR,except wide CR and HE-CR in showing right inferior pulmonary artery.The central pulmonary carcinoma was displayed more clearly by CR and LE-CR than by CRX in all aspects.The airways were involved displayed much more clearly by wide CR than by CXR.The display of peripheral vessels and inside densiy of neoplasm was similar on wide CR and CXR films,but the mass margins were abscure on wide CR.HE-CR displayed less clearly than CRX in all aspects.In the peripheral lung carcinoma,plain CR and LE-CR played the better in display of neoplasma margin and cavity in tumor than CXR did, but CXR displayed the margin clearly than wide CR did.HE-CR displayed all of the signs less clearly than CXR did. The indexes displayed by CR tomo were all bettre than that done by CXR tomo.Conclusion All kinds of CR (including CR tomo) images of chest have advantages in displaying normal strcture and neoplasma signs, versus CXR and CXR tomo images. Synthesizing the adventages of various CR(including CR tomo) images,the observator can find more signs to improve the accuracy of diagnosis of pulmonary carcinoma.