查询词典 biomechanical

Study Design: Biomechanical comparison of five different posterior cervicothoracic junction (C7–T1) fixation constructs in a cadaveric model.

研究设计：在尸体标本上比较五种不同的颈胸联合处（C7－T1）固定系统的生物力学性能

Fourteen porcine and 14 human thoracic functional spinal units with intact costotransverse and costovertebral articulations were used for biomechanical testing.

对标本在背侧方向和腹侧方向，在脊柱功能单元的上椎体正中矢状面中心加载剪切载荷，试验采用自动化光电子三维运动测量系统测量椎体旋转。

It is a convenient and precise method for physicians to establish the finite element model of the craniovertebral junction. This method facilitates the computer study on the biomechanical behavior of the local structures of the model under various pressure conditions.

该技术为临床医生对枕颈交界区有限元三维模型的建立提供了一种便捷而精确的方法，对计算机分析及研究该模型局部结构在各种受力情况下的生物力学表现创造条件。

Spine specimens were fixed to the biomechanical elongation tester (Shimazu AGS-J, Japan) with the upper clipping at the vertebra dentata, T1 and T12 vertebra, the lower clipping at the superior part of thigh bone. Under the different states, keeping or removing psoas muscle, the extended stress (N/mm^2 )of different segments of spine at the flexed and extended positions of hip joint were measured respectively.

上端十字头分别夹枢椎、第1胸椎和第12胸椎，下端十字头夹股骨上部；分别作有腰大肌状态下和切断腰大肌状态下，股髋自屈曲位到过伸带动脊柱自屈曲位到过伸位拉伸试验，测定两种不同状态下脊柱各节段的伸展应力。

The RF cage and new cage were respectively inserted into FEM of lumbar spine in L2-L3 motion segment for comparing the biomechanical features, such as stress of adjacent disc, contact pressure of interface between cancellous bone and cage, subsidence, dislodgement and range of motion.

而新设计椎间融合器和现有的RF融合器分别被放在L2-L3的运动肢段中，比较它的生物学特色，如邻近椎间盘应、骨头与融合器之间的接触压、下陷、移位和运动范围。

The impact velocity, head acceleration and encephalic stress peak during impact are important biomechanical parameters.

撞击速度、头颅的加速度和颅内压力峰值是反映颌面部撞击伤合并颅脑损伤的重要生物力学参数。

Objective: To investigate the effects of Epimedium pubescens Maxim on bone mineral density and bone biomechanical properties in ovariectomized mice.

目的 观察柔毛淫羊藿对去卵巢小鼠骨密度及生物力学指标的影响。

Another six specimens of each group was obtained for biomechanical test at 8 weeks. RESULTS: There were no significant differences between control group and fibrin group. In bFGF group compared with control and fibrin groups, appearance of the angiogenesis, fibroblast proliferation and collagen production in the sheath, epitenon and parenchyma at repair site occurred earlier and were more in quantity, the gliding excursion of the tendon was shorter, and the work of flexion and the ultimate tensile strength of the tendon were greater.

结果：对照组与纤维蛋白封闭剂组间各项观测指标比较均无显著性差别，与对照组和纤维蛋白封闭剂组相比，bFGF组修复部位腱鞘、腱外膜及腱实质的新生血管形成、成纤维细胞增殖较好，胶原的分泌出现早，数量也较多；肌腱滑动距离较短，屈曲功和肌腱最大抗拉力较大。

The biomechanical tests showed that two kinds of artificial bones had not significant difference on compressive strength and Young\'s modulus(P＞0.05),while the flexural strength of nano-nacre artificial bone was less than the control group(P＜0.05).3.The results of CCK-8 showed that the difference were not significant in each group,the proliferation of osteoblast reached the peak at the 5th day;7 days after being co-cultured,the total protein content of study group was higher than control group and blank group(P＜0.05),while the difference between control group and blank group was not significantP＞0.05The difference of alkaline phosphatase activities among three groups was not significant(P＞0.05The SEM view showed that osteoblast attached and grew well in two kinds of artificial bone.4.X-ray photography showed that two kinds of powder started to degrade in 2 weeks;this phenomenon became more appear in 4 weeks,nano-nacre powder degraded faster than micron-nacre powder,while the hole shadow was easy to be found;in 8 weeks,all the femoral holes recovered and returned to normal bone mineral density in all groups.Analysis of tetracycline fluorescent double marks in the hard tissue grinding slices indicated that new bone grew fastest around the bone defect area in study group,while most slowly in blank groupP＜0.05 SEM(scanning electron microscope observation showed that nano-nacre powder degraded more quickly.The same result can be found through the demineralized sections morphometric analysis,and both of the composite artificial bones made from those two kinds of nacre powder had the good connection with the adjacent tissue in rats body without apparent inflammatory response.5.X-ray photography showed that rabbit\'s bone defects healed faster in study group since NNAB implanted than in control group since MNAB implanted.At 24 weeks after operation,bone density in radial defects had nearly accessed to the normal area,while lower in control group,and turned up nonunion in blank group;The checking of BMD showed that results in study group were higher than those in control group at 8,16 and 24 week(P＜0.05), and the difference between the BMD values in study group at 24 week and those in blank group was not significant(P＞0.05).The gross specimens showed satisfactory histocompatibility both in study group and in control group,with bone tissue growing from two sides into the center of implanted materials; Normal slices in HE stain and hard tissue grinding slices in Stevenel\'s blue/Van Geison\'s picro-fuchsin stain showed that the bone growth tendency was better in study group than that in control group,and the medullary cavity had been penetrated to the implanted materials in study group at 24 week;Analysis of tetracycline fluorescent double marks in the hard tissue grinding slices indicated that new bone in both groups grew fastest 8 weeks after surgery,while slow down at 16 week.

纳米珍珠层/消旋聚乳酸复合人工骨与微米珍珠层/消旋聚乳酸复合人工骨分别与成骨细胞共培养后，其各时间点CCK-8法检测值与空白对照无显著差异(P＞0.05)，成骨细胞均在第5天达到增殖高峰期；培养7天后，实验组细胞蛋白含量高于对照组及空白组(P＜0.05)，后两者之间则无显著差异P＞0.05碱性磷酸酶活性在三组间均无显著差异(P＞0.05电镜下可见成骨细胞在两种人工骨上都有良好生长贴附能力。4.X-ray显示两种粉体在大鼠股骨骨洞植入第2周时都开始出现了降解，第4周时更为明显，纳米珍珠层粉较之微米珍珠层粉降解更快，而空白对照组骨洞阴影仍可见，至8周时，则所有组骨洞均己闭合修复，X-ray下已不可见原钻孔痕迹，恢复正常骨质密度；硬组织磨片四环素荧光双标记结果显示纳米珍珠层粉植入组较其余两组在骨缺损区周围新骨生长速度更快，空白组速度最慢P＜0.05电镜观察及常规脱钙切片亦可见到纳米粉体降解较快；由以上两种原材料制得的纳米珍珠层/消旋聚乳酸复合人工骨与微米珍珠层/消旋聚乳酸复合人工骨在大鼠体内均与周围组织结合良好，无明显炎症反应。5.X-ray显示纳米珍珠层/消旋聚乳酸复合人工骨植入兔桡骨缺损区后其骨愈合速度较对照组微米珍珠层/消旋聚乳酸复合人工骨植入的快，至植入术后24周，实验组骨缺损区接近正常骨密度，对照组骨缺损区密度较低，空白组则呈现骨不连状态；骨密度测量结果显示术后8周、16周、24周实验组的骨密度值高于对照组(P＜0.05，24周实验组的骨密度值与术前所测得的正常值无显著性差异P＞0.05动物取材大体所见均显示组织相容性良好，骨组织逐渐由植入材料两端向中央生长；常规切片HE染色及硬组织磨片Stevenel\'s blue/Van Geison\'s picro-fuchsin联合染色均可见实验组骨缺损区长势优于对照组，至术后24周，实验组骨髓腔与材料已呈相交通状；硬组织磨片荧光显微镜下观察，两组材料在术后8周处于骨生长最快速时期，16周时速度开始减慢，术后4、8、16周时实验组的新骨生长速度均较对照组的快

BACKGROUND: Heterogenic deproteinized cancellous bones possess good biomechanical property and provide temporal mechanical supports for the weight-bearing tissues.

背景：异种松质骨脱蛋白生物力学性能较好，能够对承载的组织提供暂时的力学支撑。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。