前轴

Consequences of the rotation of DNA are illustrated in Figure 9.17 in the twin domain model for transcription. As RNA polymerase pushes forward along the double helix, it generates positive supercoils ahead and leaves negative supercoils behind. For each

超螺旋与转录还有更多的关系，RNA聚合酶转录DNA时，解链和复链同时也发生，如同Fig113中所示，这需要整个转录复合体绕DNA旋转或者DNA自己绕它的双链轴旋转，DNA旋转的后果如Fig11.19所示，图中是一个转录的双结构域模型，当RNA聚合酶沿DNA前移时，在酶前产生正双螺旋，酶后为负的双螺旋；每一个双螺旋转角被RNA跨越后都会在前面产生+1转角，后面产生-1转角。

At 24 h, Ang1 was expressed mainly in the lens, optic cup, mesencephalon, ventral part of hindbrain, and myotomes in the somites, while zfTie2 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk. VEGF was expressed mainly in the lens, optic cup, mesencephalon and myotomes in the somites, while zfFlk1 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk.

结果从受精卵胚胎发育第12小时可见血管内皮细胞生长因子和血管发生素1及其相应受体flk1和Tie2的表达；在受精卵胚胎发育的第16小时，血管内皮细胞生长因子和血管发生素1主要在头部和尾部胚芽表达；第24小时在眼球、视窝、中脑、后脑的腹前侧和肌节中表达，Tie2和Flk1主要在肌间背部动脉血管、躯干新生血管芽和轴向静脉中表达。

Front driveshaft with plate coupling to gearbox.

前驱动轴钢板耦合变速箱。

Results The experimental eyes quickly changed from pre-experimental hypermetropin to high myopia during the experimental period, and the severity of myopia and axial length increased relative to the period of form deprivation. The expression of VIPR2 mRNA and the levels decreased over time for both groups.

结果 实验组由实验前远视眼快速演变为高度近视眼，并随遮盖时间的延长、近视度数的加深，眼轴延长；两组眼球后壁均有VIPB2 mRNA的阳性表达；随着出生时间的延长，两组VIPR2 mRNA的表达均逐渐下降。

AbstractObjectives1 Correlate bone mineral densityto vertebral compressive strengths.2 Consummate the technique for percutaneous polymethylmethacrylate vertebroplasty and observe the pattern of PMMA imaging distribution.3 Determine the strength and stiffness of osteoporotic with or without vertebroplasty with PMMA bone cement.4 Correlation of BMD,insertion torque and pull-out strengths of pedicle screws.5 Ascertain whether augmentation with PMMA bone cement can enhance pedicle screw fixation in the osteoporotic spine.6 Ascertain whether augmentation pedicle screw fixation with PMMA bone cement can enhance the stability of unstable thoracolurner burst fractures of osteoporotic spine.

目 的1、测试椎体压缩强度，分析强度与骨矿物质密度（bone mineral density，BMD）的相关关系。2、观察经皮椎体成形术后聚甲基丙烯酸甲脂（polymethylme- thacrylate，PMMA）骨水泥在椎体内的形态学分布及影像学表现。3、比较PMMA骨水泥骨质疏松椎体成形术前/后椎体最大抗压力和压缩刚度的变化。4、分析椎体BMD、螺钉最大旅入力矩和最大拔出力三者之间的关系。5、分析PMMA骨水泥强化骨质疏松椎弓根螺钉后的螺钉的最大轴向拔出力和拔出刚度的变化。6、评价PMMA骨水泥强化骨质疏松椎弓根螺钉脊柱内固定对不稳定型胸腰椎损伤的即刻稳定性和反复载荷后的稳定性。

Control of a non-stretch is mainly driven by paper Division tension, the feed roller speed ratio, rich text (press how to work out before drawing roller) ratio of a few implications.

无轴传动张力控制主要受供纸部张力、送纸辊速比、RTF（折报机三角板前的拉纸辊）速比等几方面的影响。

During surgery, 0.1mL of TA was injected into vitreous body to identify and remove vitreous posterior cortex.

术中切除中轴部玻璃体后注入曲安奈德0.1mL于玻璃体腔，以此识别玻璃体后皮质及黄斑前膜，并有效清除。

ABSTRACT Our product MMK6026, which is CNC tool grinder with 6-axis and 5-coordinate controls, is used to machine the rake face and relief ...

我们研制的MMK6026六轴五联动CNC工具磨床用于加工锥形球头立铣刀和其它复杂形状刀具的前刀面与后刀面。

To meet a Soviet Naval Air Force specification in the late fifties for an antisubmarine helicopter for ship or shore-based use, the Kamov bureau developed a helicopter powered by twin turbines installed side-by-side above the cabin, which drove two three-bladed coaxial, contra-rotating rotors as on their other aircraft.

为了满足其反潜直升机的船舶或岸上使用前苏联海军空军在50年代末规格，卡莫夫局研制的双涡轮机驱动的直升机机舱内安装以上，其中开车边按边两个三刃同轴，禁忌旋转的转子上的其他飞机。

Long- short axis is one of the most simple, prompt and operational methods among the limited deformation methods in outdoors. It requires studies as a circular section or circular section of strain ellipsoid and normal distribution before their deformations .

摘 要：岩石有限应变测量的方法较多，相比之下，&长短轴法&最简单、快捷，野外易于操作，但是对所选的对象变形前要求近圆形，或者椭圆形，且随机分布。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。