A stereologic study of lamellar bodies within pulmonary alveolar type II cells in dogs with experimental acute hemorrhagic pancreatitis(group P)and in dogs inje- cted muscularly with choloroquine before inducing pancreatitis (group PI)was carried out.Our findings showed that volumerical density (Vv), surface density (Sv)and numerical density(Nv)of lamellar bodies were decreased by 29.06%,30.28% and 40.75% in the group P as compared with those in the control group (group N), respectively, and their Sv and Nv were decreased by 23.8% and 30.26% in comparison with those in the group PI.The results suggest that the lung injury resulting from acute hemorrhagic pancreatitis was characterized by alveolar surfactant System damage.Dramatical decrease in the number of the lamellar bodies affected the surface tension of alveoli in a certain degree, leading to atelectasis.There was a relationship between lung injury and the effect of PLA2(phospholipidase A2).Choloroquine might play a role in maintaining the number of lamellar bodies.

The pan-English lecture is one of the important measures to run a higher institution,improve the teaching quality and heighten recognition.Manwhile,it also brings up all-wave impact to the medical eduaction and management in China,such as the course system,the teacher education,the combination of practice and theory and so on.And in this article,the author analyzed the influence factors of the medical teaching quality of the overseas students from the points of teachers,content of courses and students.

To evaluate the fatigue behavior of nitinol stents, we used the finite element method to simulate the manufacture processes of nitinol stents, including expanding, annealing, crimping, and releasing procedure in applications of the clinical treatments. Meanwhile, we also studied the effect of the crown area dimension of stent on strain distribution. We then applied a fatigue diagram to investigate the fatigue characteristics of nitinol stents. The results showed that the maximum strain of all three stent structures, which had different crown area dimensions under vessel loads, located at the transition area between the crown and the strut, but comparable deformation appeared at the inner side of the crown area center. The cause, of these results was that the difference of the area moment of inertia determined by the crown dimension induced the difference of strain distribution in stent structure. Moreover, it can be drawn from the fatigue diagrams that the fatigue performance got the best result when the crown area dimension equaled to the intermediate value. The above results proved that the fatigue property of nitinol stent had a close relationship with the dimension of stent crown area, but there was no positive correlation.
Alloys ; Computer Simulation ; Equipment Failure Analysis ; Finite Element Analysis ; Stents

Field operation infirmary should conquer many complicated situations, such as overuse of vehicles, too far maneuvering distance, too long maneuvering time, and complicated road state. The author puts forward that in the marching, the division of responsibilities and march discipline should be very strict, and vanguard should be sent before field operation infirmary, which ensure the operation infirmary to reach the destination safely and successfully.

BACKGROUND:Human leukocyte antigen F-associated transcription factor 10 (FAT10) is highly expressed in many tumor cel s like colon cancer cel s, but its relationship with esophageal cancer is less reported. OBJECTIVE:To investigate the effects of siRNA interference technique on the invasion, apoptosis and the characteristics of EC9706 cel s, a human esophageal cancer cel line. METHODS:siRNA sequence was designed and synthesized according to the FAT10 mRNA encoding sequence, and the EC9706 cel s were transiently transfected. EC9706 cel s were divided into three groups:siRNA FAT10 group, negative control group, and blank control group. The expression levels of bcl-2 and FAT10 were detected by RT-PCR and western blot assay, respectively. Cel counting kit-8 assay was used to measure the proliferation of cel s in vitro. Flow cytometry was used to observe the changes of cel cycle, cel apoptosis and the expression of CD44+CD133+. TUNEL staining was used to detect the apoptosis of the cel s. Cel invasion in vitro was detected by Transwel invasion assay. RESULTS AND CONCLUSION:RT-PCR and western blot findings showed that compared with the negative control group and blank control group, the expression levels of bcl-2 and FAT10 mRNA and protein were significantly decreased in the siRNA FAT10 group (P<0.05);the percentage of CD44+CD133+cel s was decreased significantly (P<0.05);and significantly increased apoptosis rate, and decreased cel proliferation and invasion were also found in the siRNA FAT10 group (P<0.05). In conclusion, the specific silencing of FAT10 gene can reduce the invasion of esophageal cancer cel s, inhibit cel proliferation, reduce bcl-2 expression, and increase the apoptosis rate. Meanwhile, the proportion of CD44+CD133+cel s is decreased.

Objectives: To investigate the characteristics and their functional significance of TMJ disc and its attachment. Methods: Each of the 23 TMJs from 12 cadavers were divided into quadrants sagitall y, and total 92 histological slices were obtained and stained with HE.The morpho logical characteristics of the samples was observed microscopically. Results: ①Both temporal posterior and anterior mandibualr attachment s were loose while mandibular posterior and anterior temporal attachments were d ense in which the fibers run anterior posteriorly. ②Fibers in the intermediate zone ran predominantly in anterior posterior direction while those in both ant erior and posterior bands were mixed with transverse fibers. ③At the posterior portion of disc there were 33 out of 92 slices from 6/12 cadavers (11/23 TMJs) s howed the structure of "the fourth band" which was featured by dense fibers alik e those of inner disc. There were 36 out of 92 slices from 6/12 cadavers (10/23 TMJs) showed the structure of "turned fibers" which was featured by a sudden tu rning of fibers from the thick posterior band back and downward, providing an angle like sign. Conclusions: There is great difference o f fiber direction in various parts of disc and its attachments, reflecting the functional demands.

Objective To investigate the effects of mifepristone on the ultrastructure of Hofbauer cells in human early pregnant placenta. Methods Twenty 6-9 week pregnant women with indications of pregnancy termination were recruited and randomlied to mifepristone (n=10) and D & C group (n=10).Villi were collected and studied with transmission electron microscope. Results In comparison with the control group,the ultrastructure of Hofbauer cells of mifepristone group showed the following changes: the cells were markedly edematous. The number of cytoplasmic processes of Hofbauer cells deceased obviously. In the cytoplasm of Hofbauer cells,the size of vacuoles enlarged and of mitochondrias minimized.Rough endoplasmic reticulum and Golgi complex were under-developed.Lysosomes were rare.The nuclei enlarged and showed irregular shape. Conclusions Mifepristone may change the phagocytosis'water and electrolyte transportation and immunological function of Hofbauer cells by influencing the ultrastructure of the Hofbauer cells.Therefore it can influence the development of pregnancy.

Objective Human amniotic mesenchymal stem cells (AM-MSCs) transplantation and to investigate the effect of propofol treatment, recovery of brain injury in rats. Methods 80 SD rats, male and female, weight 300-350 g. Human amniotic mesenchymal stem cells cultured in vitro and recovery (CM-Dil) before transplantation standby. The fluid percussion brain injury device, give 2.5-3.0 ATM hydraulic impact, severe fluid percussion brain injury model was made. After injury 6h give corresponding treatment which were randomly divided into 4 groups: injury group (medium injection group), AM-MSCs transplantation group and propofol group, AM-MSCs + propofol group. The number of positive cells in each group was observed under the fluorescence microscope using CM-Dil markers. 4 weeks after transplantation, 6 rats were randomly executed, and RT-PCR and Blot Western were used to detect the changes of GAP-43, AQP4 gene expression and protein synthesis in brain tissues. After transplantation, 24 h, 3 days and 1, 2, 3, 4 weeks for animal neurological deficit score, in 4 weeks after transplantation of Morris water maze (Morris Water Maze, MWM) test. They were killed after four weeks by immunohistochemistry, HE staining. Results Number of CM-DIL positive cell was the most in AM-MSCs + propofol group, which was in propofol group and AM-MSCs transplantation group were lower than that in the AM-MSCs + propofol group, which in injury group was the least, and the differences among the groups had statistically significant (P<0.05). 4 weeks after transplantation, AQP4 and its mRNA expression of brain damage surrounding tissue in injury group were higher than those in AM-MSCs transplantation group and propofol group; which in AM-MSCs transplantation group and propofol group was higher than those in AM-MSCs + propofol group (P< 0.05); GAP-43 protein and mRNA expression in injury group were lower than those in AM-MSCs transplantation group and propofol group, which in AM-MSCs transplantation group and propofol group were lower than those in AM-MSCs + propofol group (P<0.05). 1 weeks after transplantation, rat nerve dysfunction score in AM-MSCs + propofol group was lower than that in propofol group and AM-MSCs transplantation group; which in propofol group and AM-MSCs transplantation group was lower than that in the control group (P<0.05). The times of crossing platform in AM-MSCs + propofol group was higher than that in propofol group and AM-MSCs transplantation group, significantly higher than that in the injury group (P<0.01). The pathological section was observed 4 weeks after injury, there was no axonal passage in the injury group. In propofol group and AM-MSCs transplantation group, a few axonal like structures were observed, more axonal like structures were observed in AM-MSCs + propofol group. Conclusion Propofol combined with human amniotic mesenchymal stem cells transplantation can significantly improve the neurological function of rats with brain injury.

Objective To discuss error factor of the manufacture on baffle plate of radiation field and improve methods of quality assurance and quality control.Methods The errors on different types of baffles were analyzed and evaluated by combining the result of the practice of making baffle and testing of baffle.Results As the difference on the production process and the method of making baffle,there is different degree error on baffle plate of radiation field.The extreme consequence was influenced by quality grate of every manufactured link.Conclusion The technical level of personal,the accuracy of making methods,the equipment precision and the material quality can be produced varying degrees in making.The perfect quality control and quality assurance system can be ensured minimum error.

BACKGROUND:The human telomerase reverse transcriptase (hTERT) is one of preferred growth factors for regulating proliferation and directional differentiation, has multiple biological effects, and laids the foundation for geneticaly engineered immortalized stem cel lines. OBJECTIVE: To investigate the effect ofhTERT gene-modified umbilical cord mesenchymal stem cel transplantation on acute kidney injury induced by ischemia and reperfusion in rats. METHODS:The human umbilical cord mesenchymal stem cels were cultured in vitro. Rat models of acute kidney injury induced by ischemia and reperfusion were established. Rat models were randomly divided into three groups. Rats in the control group were injected with 1 mL L-DMEM medium through caudal vein. Rats in the negative transfection group were injected with 1 mL umbilical cord mesenchymal stem cel suspension after empty virus transfection through caudal vein. Rats in the hTERT transfection group were injected with 1 mL umbilical cord mesenchymal stem cel suspension after PLXSN-hTERT transfection through caudal vein. RESULTS AND CONCLUSION:At 3 and 28 days after transplantation, hematoxylin-eosin staining showed renal tubular damage score in the hTERT transfection group < negative transfection group < control group (P < 0.05). At 28 days after transplantation, the number of CM-Dil-positive cels in the hTERT transfection group > negative transfection group > control group (P < 0.05). At 1, 3, 14, and 28 days, serum creatinine and urea nitrogen levels in the hTERT transfection group < negative transfection group < control group (P < 0.05). The results confirm that hTERT gene-modified umbilical cord mesenchymal stem cel transplantation has a significant repair effect on acute kidney injury in rats.