培养细胞整装内质网三维结构的多态性

用高锰酸钾－锇酸固定法制备了５种培养细胞整装内质网标本，并在扫描电镜下对其三维结构进行了观察。观察结果表明内质网是由膜性小管构成的贯穿整个细胞质的管囊网络样膜性区室，并以多种形态深入到细胞伪足及突起中；细胞质中内质网则表现为簇状网络（见于ＧＣＭ３Ｔ３细胞）、多态性多孔扁囊样网络、筛网状网络、条索状网络、大孔条索网状和细孔扁囊样分区网络、不规则管网状和多孔管囊分区网络（见于ＣＶ－１细胞）、细管网络（见于ＣＣＬ１８７和ＣＣＬ２２９细胞）、球囊网络（见于ＣＣＬ１８７和Ａ４３１细胞）和不规则管网状网络（见于Ａ４３１细胞）等。内质网的这种多态性提示它是一种高度可变的结构，其可变性可能与细胞特性、分化程度、细胞功能状态及细胞骨架系统的分布变化等因素有关。     

尺神经深支,骨间前神经旋前方肌支的应用解剖

尺神经深支向近侧无损伤分离后,可超越旋前方肌上缘以上26.58mm,此时宽1.80mm、厚1.00mm,可与宽1.35mm、厚0.89mm的旋前方肌支缝合。     

虚拟咬合运动初步仿真模拟的研究与实现

我们试验了利用VR技术进行虚拟咬合仿真制作的全部过程。首先,采用光学三维测量仪对上下颌石膏模型进行数字化,通过预处理获取有效的三角网格曲面模型;其次,对咬合运动模型进行合理的简化,分解为一系列的平移运动和旋转运动;通过动态刷新完成开闭口运动、侧移运动的计算机运动仿真,可视化地观察咬合运动;然后利用模型碰撞检测算法动态地计算咬合接触位,并详细地分析了咬合接触时的咬合点位置分布和咬合剖切面上的咬合点接触关系;最后讨论了目前虚拟咬合仿真存在的问题和今后研究的方向。     

旋入式髓内钉治疗肱骨干骨折

目的介绍和总结旋入式髓内钉治疗肱干骨折的方法及疗效.方法自2000年6月～2003年10月采用旋入式髓内钉顺行植入治疗肱骨干骨折12例,术后不用外固定,一周后进行适当功能锻炼;粉碎性骨折石膏固定6周后,开始功能锻炼.结果本组1 2例,均经3个月～2年随访,获得愈合,无并发症出现.按Neer功能评分标准,优良率100%.结论旋入式髓内钉治疗肱骨干骨折,固定牢靠,并发症少,愈合率高,功能恢复良好,是一种有效的治疗方法.     

骨骼肌介电行为的理论模型仿真

在 10 0 Hz～ 10 0 MHz范围内 ,应用椭圆壳介电理论模型 ,经过模拟仿真蛙骨骼肌细胞的介电行为 ,确定了蛙骨骼肌细胞的椭圆壳模型各相参数。为将来对骨骼肌疲劳、肌营养不良和肌肉萎缩等病症的模型分析奠定理论基础。     

Engineered BGMK cells for sensitive and rapid detection of enteroviruses

Decay-accelerating factor (DAF) has been reported to be a cellular receptor for several enteroviruses. Buffalo green monkey kidney (BGMK) cells expressing human DAF (BGMK-hDAF cells) showed increased susceptibility and sensitivity to several types of enteroviruses compared to wild-type BGMK cells. When 17 frozen positive clinical samples were tested, BGMK cells detected 8 and BGMK-hDAF cells detected 16. Since the CaCo-2 cell line has been documented to support the replication of most enteroviruses, CaCo-2 cells were mixed with BGMK-hDAF cells in order to increase the number of viruses detected. Thirty-four frozen clinical samples that previously had tested positive for enteroviruses were tested, and the following numbers were detected: 33 of 34 by CaCo-2/BGMK-hDAF cells, 29 of 34 by CaCo-2/BGMK cells, 28 of 34 by H292/RD (E-mix A) and A-549/BGMK (E-mix B) cells, and 26 of 34 by MRC-5 and pRhMK cells.     

戊型肝炎病毒归科的形态学证据

采用超簿切片制样及负染色免疫电镜方法，对经细胞培养自戊型肝炎病人分离的８７Ａ株病毒进行了形态及形态发生的研究。结果显示，感染细胞胞浆局灶性空泡液泡病变区明显而普遍；病毒呈晶格样排列，在胞浆内装配成熟，与粗面内质网、病毒性包涵体、微丝等密切相关；病毒毒粒无囊膜，大小约３０ｎｍ呈圆形，表面形态不规整，电致密度不均一，偶见“凹杯形”、“刺突”等表面超微结构；感染细胞核呈现扭曲变形，异染色质趋边等显著受累及病变。其形态及形态发生特征表明其应为嵌杯病毒科新属—嗜肝ＲＮＡ病毒属的成员，而部分核苷酸序列分析也支持其为戊型肝炎病毒。     

Metabolism and physiological behaviour of Leuconostoc mesenteroides subsp. mesenteroides growing on raffinose

The α-galactosidase activities of 11 strains of Leuconostoc mesenteroides subsp. mesenteroides grown on glucose, lactose or raffinose were determined. The inductive effects of lactose and raffinose differed depending on the strain. In four of the strains, α-galactosidase activity of cells grown on lactose was higher than that of cells grown on raffinose, while the reverse was true for one other strain. The study of two strains exhibiting a different behaviour was extended to all raffinose-component sugars: melibiose, sucrose, glucose, galactose and fructose. The apparent fermentation yields with raffinose-component sugars complied with heterofermentation theory, except for sucrose, where there was a 40% deficit in fermentation products. Raffinose hydrolysis enzymes (α-galactosidase and β-fructosidase) underwent a catabolic repression by glucose. Growth on raffinose was considerably stimulated if the inoculum was first grown on melibiose or raffinose (induction of α-galactosidase).