生物型

The mechanical property testing shows that the seamless PLLA tubes perform excellent radial strength,which indicates that the mechanical properties of biodegradable stents made of these tubes was supposed to be excellent.PLLA and its composites were first used in preparing seamless tubes as antecedency of laser-cut biodegradable coronary stents in china.Finite element analyses of the biodegradable coronary stent model indicate the explorative design basically meets the requirement of reasonable and applicable stents.There is not such kind of research yet in domestic.Optimum laser-cuttting parameters of CO2 laser was cauculated based on experiential formula,within it,biodegradable coronary stents,especially those with complex structure would be manufacutured from seamless tubes quickly by laser microprocessing with high consistency to the design model.The processing efficiency of the CO2 laser demonstrated in experiential formula by us will play an important guiding role in manufacturing biodegradable stents by laser-processing.Our stents that ascribed to laser-cutted,slotted tube stent are proved to be biodegradable, self-expandable and good biocompatible,basically reach the international level on the aspest of manufacturing procedures and design.

研究结果表明：壳聚糖改性材料综合性能优于纯PLLA，更适合于作为可降解冠脉支架的原材料；自主设计的探索性自膨胀管状闭环型可降解冠脉支架的性能符合冠脉设计要求，设计、验证生物可降解冠脉支架模型的研究在国内还未见报道；制备的改性PLLA无缝管的力学性能优越，可通过激光切割获得冠脉支架，这是国内首次采用聚乳酸材料来制备通过激光加工出可降解冠脉支架的无缝管；二氧化碳激光器加工精度能达到加工要求，加工出来的血管支架名义设计与实测值误差小，实现了冠脉支架、尤其是带有复杂外观设计冠脉支架的快速化、规范化加工，对二氧化碳激光器加工聚乳酸材料的效果研究在国内外属于首创，获得的经验公式对日后的深入研究有重要的指导意义；制备的支架为激光切割管状闭环型冠脉支架，支架外观设计、支架加工手段、支架的性能都基本接近国际水平，支架样品符合设计的理念，可以实现自膨胀功能。

To better understand the roles of LsrA protein in nodulation, a series of analyses of nodules using scanning electron microscopy, genetic and biochemical approaches have been carried out. Our analyses suggest that the lsrA1 nodules contain bacteroids in the invasion and establishing zone only. The lsrA gene expression is active early in the invasion zone and activated later than bacA genes. The lost of LsrA protein dramatically reduced the expression of nifA and fixK, and completely blocked the expression of the nifH gene for nitrogenase. LsrA protein functions early in the bacteroid development and it is essential for the development nitrogen fixing bacteroids.

前期的工作中，苜蓿中华根瘤菌Rm1021中90个候选LysR基因已经被定向插入突变，并筛选在自生生长时期、共生生长时期的表型，以期寻找更多在自生状态或共生固氮中有功能的LysR转录因子。1 针对前期鉴定出的共生固氮必需的lsrA基因，我们应用了一系列扫描电子显微镜技术、生物化学、分子遗传学等方法，发现lsrA基因主要在根瘤侵染区开始表达，表达时序也在侵染阶段左右，但晚于bacA基因表达；LsrA蛋白缺失后根瘤固氮区中缺乏具有固氮能力的类菌体，nifA和fixK基因的转录水平降低，nifH基因的转录被完全阻断，因此LsrA蛋白为根瘤发育所必需，是新的根瘤发育信号传导途径成员。2 通过表型筛选我们鉴定了苜蓿中华根瘤菌的oxyR基因，并研究了它的调节特性。oxyR突变后，苜蓿中华根瘤菌对过氧化氢敏感性提高，适应性降低。

Most proerythroblast showed of irregular nuclei, while the Swisscheeseappearance of the heterochromatin was usually found in basophilic and polychromatic erythroblast.

CDAⅠ型的主要超微结构特点为幼红细胞巨幼样增生，其次是中幼阶段核膜损伤和晚幼阶段的核溶解和核碎裂，生物膜系统广泛破坏是CDAⅠ型主病理机制。

This combined method was conformed to the biomechanical mechanism in orthodontic treatment and is feasible for the treatment of anterior deep overbite cases with lower mandibular plane angle.

该矫治方法符合正畸生物力学原理，其疗效好，疗程短，适合于非高角型前牙深覆特别是低角型深覆的矫治。

There were significant differences in the distribution patterns of serotypes of biovar parvo between the different groups.

Uu生物一群各血清型在不同人群中的分布有着明显的差异，其中血清3型的检出率最高。

ABSTRACT Heliothis armigera nuclear polyhedrosis virus , due to its special pestiferous effect on Heliothis armigera and being innocent to human, livestock and environment, has been a commercial bioinsecticide widely in the world for years.

棉铃虫核型多角体病毒是我国最早注册的杆状病毒杀虫剂，到1999年，约有100，000公顷棉田用棉铃虫核型多角体病毒的生物制剂防治害虫。

Chronic Hepatitis B is a frequent infectious disease due to HBV clinic, mostly is liver of inflammation and histology and biochemistry, with unconventionality symptom continuous preponderate over six months, state of an illness without looking up or liver have activity variety of inflammation.

慢性乙型肝炎是由乙型肝炎病毒引起的临床上常见传染病，主要是指肝脏的炎症、组织学、生物化学异常征象持续超过6个月，病情无好转或肝内有活动性炎症变化者。把中医辩证和现代检测指标相结合进行研究的报道还不多见。

115 caprine right femurs were taken and created to simulate AO/33-A3 fracture. All fracture models were fixed by the right 5 hole LISS Plate, which treated differently by using unicortical or bicortical screws in the proximal end of the LISS plate. And then withdrawal force and torsional force were given on them to make comparison.

取115根新鲜羊右侧股骨，造成股骨远端AO分型33-A3型骨折，并均采用5孔右侧股骨远端LISS钢板予以固定，在骨折近端固定螺钉单双皮质不同分布状态下，分别作拔出和扭转的生物力学对比试验研究。

Evans typy Ⅰ intertrochanteric fracture were produced and fixed with A-P Gamma nial. In the standing position, press test were carried out on MST tested instrument for to compare the biomechanical property of A-P Gamma nail with the control.

将新鲜尸股骨制成EvansⅠ型粗隆间骨折模型，用A-P型Gamma钉进行安装固定，与不作任何处理的对照组分别在MTS实验机进行抗压和抗扭转实验，比较两者的生物力学性能。

Expression of mutant tumor suppressor gene p53 in egg-type chicken with avian leukosis subgroup J was detected to study cancericidally molecular mechanism of ALV-J. Using immunohistochemistry method of strep avidin-biotin complex, many organs of illed egg-type chickens, involved liver, kidney, ventriculus glandularis, tumor, heart, pancreas, bone marrow, spleen, oviduct, lung, duodenum, thymus and bursa of fabricius were studied.

为了探讨J亚群禽白血病病毒的致癌分子机理，观察蛋用型鸡发生J亚群禽白血病时p53抑癌基因在各脏器中的表达，应用链霉亲和素-生物素-过氧化物酶复合物免疫组化法，研究了蛋用型鸡J亚群禽白血病自然病例的肝脏、肾脏、腺胃、肿瘤、输卵管、心脏、胰脏、骨髓、脾脏、肺脏、十二指肠、胸腺和法氏囊。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。