Objective To investigate the effects of titanium nitride(TiN) coating on corrosion resistance of dental Co-Cr alloy in the simulated oral environment. Methods The Co-Cr alloy commonly used was casted with specimen sized of 10 mm× 10 mm×3 mm. Then the specimen was coated with a thickness of 2.5 μm TiN coating on the surface by multi-arc physical vapor deposition. The Tafel polarization curves of the specimen before and after coating titanium nitride in artificial saliva were measured by electrochemical station. Results From the Tafel polarization curves, the specimen after coating TiN showed that both anodic polarization curve and cathodal polarization curve were fiat, natural corrosion potential moved to the positive way, and passivation interval got longer. From the annular anodic polarization curves, the specimen after coating TiN had almost no "delay area". Conclusion TiN coating can improve corrosion resistance of Co-Cr alloy.

Cancer stem cells are a new field with the gradual deep understanding of the stem cell research.Although its history is not long,the rapid development showed a good potential prospect.The existence of cancer stem cells and its use as tumor formation,growth and metastasis-based approach has been widely recognized.In theory,cancer stem cells derived from normal stem cells can transform.Cancer-causing factors can also be derived from the dedifferentiation induced cells.Because it contains all-round,multi-and single stem cell,with the proliferation and differentiation potential of different directions,it is possible to explain the heterogeneity of tumor cells,and reasons for hypoxic environment,anti-cancer drugs and radiation resilience.In this area,it has been made a lot of progress in recent years.However,there are still some problems to be solved.Such as the identification of cancer stem cells,biological function and mechanism.

Objective To investigate the effect of impression of the inherent deformation after adding the circular marker on oral impression. Methods Two metal molds were made by American Dental Association standards. Six metal circular needles were inserted on one of molds. Two groups of impression sample which named A and B were made by two metal molds. Marker line on the impressions were measured and observed by measuring microscope to compare the impressions (group A and B) with the deformation extent and the deformation law. Croup t test method of SAS6.12 software was adopted to analyze the dimensional changes of the samples. Results The deformation range of two. groups( A and B) of alginate impressions was 0.38% ～ 0.58% and 0.43% ～ 0. 66%. Two groups of silicone impressions' deformation range was 0.38% ～ 0.42% and 0.33% ～ 0.49%. There was no significant difference between the two groups (P > 0.05 ). Conclusion The method with adding markers points on the oral impression would the impression of the inherent deformation. This marking method wag feasible.

Objective In order to discuss the nursing points for chronic skin ulcer patients who had ac-cecpted local oxygen therapy and traditional chinese medicine treatment. Methods We gave totally nursing to 20 patients who accecpted local oxygen therapy and traditional chinese medicine treatment. Results Eighty percent patients had obtained clincal cure and got successful nursing effect. Conclusions Careful perioperation nursing and related monitoring can improve the cute rate of chronic skin ulcer, and then pre-vent complication.

Cancer stem cells are a new field with the gradual deep understanding of the stem cell research. Although its history is not long, the rapid development showed a good potential prospect. The existence of cancer stem cells and its use as tumor formation, growth and metastasis-based approach has been widely recognized. In theory, cancer stem cells derived from normal stem cells can transform. Cancer-causing factors can also be derived-from the dedifferentiation induced cells. Because it contains all-round, multi-and single stem cell, with the proliferation and differentiation potential of different directions, it is possible to explain the heterogeneity of tumor cells, and reasons for hypoxic environment, anti-cancer drugs and radiation resilience. In this area, it has been made a lot of progress in recent years. However, there are still some problems to be solved. Such as the identification of cancer stem cells, biological function and mechanism.

BACKGROUND:Bone marrow mesenchymal stem cells can survive under the lethal dose of radiation in response to hematopoietic stem cells, and stil maintain the typical characteristics of stem cells to promote hematopoietic recovery after radiation. However, autophagy is an important mechanism for cellular adaptation under stress, which may be involved in radiation tolerance of bone marrow mesenchymal stem cells. OBJECTIVE:To investigate the role of autophagy in human bone marrow mesenchymal stem cells in response to irradiation. METHODS:Passage 3 bone marrow mesenchymal stem cells cultured in vitro at logarithmic phase were col ected and randomized into control, 3-mehyladenine, rapamycin, irradiation, irradiation+3-mehyladenine and irradiation+rapamycin groups. The autophagy reactions of bone marrow mesenchymal stem cells were regulated by 5 mmol/L 3-mehyladenine and 200 nmol/L rapamycin for 12 hours in the 3-mehyladenine and rapamycin groups, respectively. Two-hour 6 Gy X-ray irradiation was performed in the irradiation group and two complication groups undergoing 12-hour corresponding drug intervention. RESULTS AND CONCLUSION:The proportions of cells with autophagic vacuoles and apoptotic cells were higher in the irradiation group than the control group, moreover, autophagic+apoptotic cells were increased in the irradiation group. 3-mehyladenine intervention could decrease the proportion of cells with autophagic vacuoles,and increase the number of apoptotic cells. But there was no difference in the proportion of autophagic+apoptotic cells between the 3-mehyladenine and irradiation groups. After rapamycin intervention, the proportion of autophagic cells was higher than that in the irradiation group, but no difference in the proportion of apoptotic cells between the two grups, as wel as there were no autophagic+apoptotic cells. The expression of microtubule-associated protein 1 light chain 3-II was ranked as fol ows:the control and 3-mehyladenine groups

Biomarkers, Tumor ; metabolism ; Carcinoma, Small Cell ; genetics ; metabolism ; pathology ; Carcinoma, Squamous Cell ; pathology ; Chromosome Aberrations ; Diagnosis, Differential ; Humans ; Keratins ; metabolism ; Lymphoma ; pathology ; Mucin-1 ; metabolism ; Urinary Bladder ; pathology ; Urinary Bladder Neoplasms ; genetics ; metabolism ; pathology

Objective:To study the effect of compressive stress on expression of connective tissue growth factor(CTGF) in rabbit mandibular condylar chondrocytes in vitro. Methods:CTGF mRNA were determined by semiquantitative RT-PCR in rabbit mandibular condylar chondrocytes cultured in vitro. Results:Within a certain compressive stress, CTGF mRNA were up-regulated with the increase of compressive stress. While under certain compressive stress, CTGF mRNA were gradually up-regulated following the increase of culturing time, and reaching the maximum at 2~6 h, then gradually down-regulated until at 24 h. Conclusion:Application of different compressive stresses can up-regulate the expression of CTGF mRNA in rabbit mandibular condylar chondrocytes. It may be involved in the stress -mediated mandibular condylar cartilage remodeling.

35) and the third strategy of providing diagnosis to those tested positive at screenings in mid-term pregnancy could, respectively, lead to the diagnosis of 0.93 and 1.47 cases of DS per 10 thousand pregnant women, but they could also induce, respectively, 1.58 and 0.28 cases of miscarriage of normal fetuses due to diagnosis procedures. The costs of one DS diagnosis were, respectively, 108890.98 yuan and 443683.11 yuan. Conclusion Taking into consideration both cost-effectiveness and safety factors, priority ought to be given to the third strategy.

Adult ; Betacoronavirus ; Clinical Laboratory Techniques ; Coronavirus Infections ; diagnosis ; epidemiology ; etiology ; prevention & control ; therapy ; Diagnosis, Differential ; Extracorporeal Membrane Oxygenation ; Humans ; Pandemics ; prevention & control ; Pneumonia, Viral ; epidemiology ; etiology ; prevention & control ; therapy ; Practice Guidelines as Topic ; Respiration, Artificial