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In eutherian mammals, XCI is thought to be triggered by the expression of the non-coding Xist RNA from the future inactive X chromosome3, 4, 5; Xist RNA in turn is proposed to recruit protein complexes that bring about heterochromatinization of the Xi6, 7. Here we test whether imprinted XCI, which results in preferential inactivation of the paternal X chromosome, occurs in mouse embryos inheriting an Xp lacking Xist.

在最新一项研究中，美国北卡罗琳娜大学研究人员用小鼠胚胎（研究人员用基因工程方法使这些小鼠在其未来失活的X-染色体上含有一个有缺陷的Xist基因）所做的新的研究工作显示，实际情况更为复杂。

The results have been compared with that by using coupled mode theory , Rouard s method and fundamental matrix method, and the accuracy.

用这一方法计算了均匀光纤光栅布拉格相位匹配、失配情况和非均匀光纤光栅的反射系数，并将其结果与用耦合波理论、Rouard方法以及基础矩阵方法的结果进行了比较，并检验了这些方法的精度。

The deformation mechanism is mainly the single-slip and cross-ship, the fracture mechanism is mainly the congregation of transgranular micro-hole, and large uniform deformation occurred before tough fracture, and therefore, the ability of plastic deformation and the mechanical properties of the material were remarkably improved. These fully indicate that the new melt-treatment developed in this work is an effective and advanced technique, and further testify that the improvement of metallurgical quality of the material is the key to enhance its mechanical properties, especially its plastic deformation performance. The results of tensile and compression tests at elevated temperature also indicate that the suitable hot-working temperature range is 400～450℃. 4. A steady-state plastic flow exists during the plastic deformation of the aluminum sheet used for pressure can at elevated temperature. A hyperbolic sine relationship can be satisfied between the steady-state flow stress and strain rate by introducing an Arrhenius term which involves some thermal activation parameters, i.

压力罐用铝材中的主要冶金缺陷为Al〓O〓夹杂物、气孔及富Fe杂质相；高效熔体处理显著改善了材料的冶金缺陷的存在形态，使含杂量明显减少、夹杂物尺寸变细小且分布均匀，富Fe杂质相变为细小、分布均匀的团球状或短棒状的复杂化合物，同时也明显细化了结晶组织；此外，由于高效熔体处理有效地减少了材料中裂纹萌生源数量，因而改变了材料的塑性变形微观过程及断裂方式，主要以单滑移和交滑移进行塑性变形，断裂方式为穿晶微孔聚集型，韧性断裂前产生了大量的均匀变形，不易出现变形失稳，从而显著提高了罐用铝材的塑变能力和力学性能。

Data of tooth surface before and after wear were both obtained through laser scan system. The images were then reconstructed by SURFACER software.(2) C language program used of improved iterative closest point algorithms was developed to registrate imagines before and after wear. Standard plan was defined to the overlapped imagines after registration, then wear quantity was measured.￤ear was imitated by tooth brush machine which was made by STOMATOLOGY COLLEGE FORTH MILITARY MEDICAL UNIVERSITY.

应用三维激光扫描仪采集牙模型的表面数据，在计算机中用SURFACER逆向工程软件重建牙表面；②运用最近邻点迭代匹配算法加以改进，编制 C语言程序，配准磨耗前后的三维图像，在确定基准平面后，计算磨耗前后的体积变化量；③用口腔医院自制刷牙机进行模拟磨耗，用传统称重法，通过电子天平测试件的重量变化，用失水法计算测试材料的密度，换算成体积。

First 27 rabbits of the experimental group were destabilizated by operated on L6、7.Inj Diazepam 0.25 mg/kg,Inj Ketamine 0.02 g/kg and Inj Atropine 0.125 mg/kg was one by one injected into the rabbit through the auris vein,shearing the rabbit hair of backside waist,fixing the rabbit on operation table in face lying,using 1% Povidone Ioding to degerm the operation area.Every rabbit was incised at the backside of its waist,that incisal opening is located in the center of the intervertebral space (L6、7 space) that both side iliac crest line correspond ,from the meso-ordinate direction cut about 4 cm incision,cutting open skin and subcutaneous tissue,thoroughly ,exposing the spinous processes the vertebral plates and the upper-inferior articular processes,entirely segregating the muscles that cohere the spinous processes the vertebral plates and the articluar process,then excising the supraspinal ligaments and interspinal ligaments,biting off two sides the inferior articular processes of L6,in order that resulting in intervertebral destabilization,using 0.9% Inj.Sodium Chloride to washout the incisal opening,in order sewing up each layer tissues.

方法］ 取48只6个月龄日本大耳白兔，雌雄不限，体重为（2.5±0.2） kg，随机进行分组，分为对照组和实验组，对照组为21只；实验组为27只；先将实验组兔腰背部皮毛剪除，用安定注射液1.25 mg/kg、氯胺酮0.02 g/kg、阿托品0.125 mg/kg顺次耳缘静脉注射麻醉后，俯卧固定于手术台上，用1%碘伏消毒手术区域，以髂嵴平对椎间隙（即L6、7）为中心，从正中取一长约4 cm纵行切口，切开皮肤及皮下组织，锐性分离，暴露棘突、椎板及上下关节突，将附着于棘突、椎板及小关节的肌肉全部分离开，然后依次切除L6、7棘上及棘间韧带，咬除第6腰椎两侧下关节突，造成椎间失稳，用无菌生理盐水冲洗切口，依次缝合各层组织；术后动物在笼中自由活动。

Inj Diazepam 0.25 mg/kg,Inj Ketamine 0.02 g/kg and Inj Atropine 0.125 mg/kg was one by one injected into the rabbit through the auris vein,shearing the rabbit hair of backside waist,fixing the rabbit on operation table in face lying,using 1% Povidone Ioding to degerm the operation area.Every rabbit was incised at the backside of its waist,that incisal opening is located in the center of the intervertebral space (L6、7 space) that both side iliac crest line correspond ,from the meso-ordinate direction cut about 4 cm incision,cutting open skin and subcutaneous tissue,thoroughly ,exposing the spinous processes the vertebral plates and the upper-inferior articular processes,entirely segregating the muscles that cohere the spinous processes the vertebral plates and the articluar process,then excising the supraspinal ligaments and interspinal ligaments,biting off two sides the inferior articular processes of L6,in order that resulting in intervertebral destabilization,using 0.9% Inj.Sodium Chloride to washout the incisal opening,in order sewing up each layer tissues.

方法］ 取48只6个月龄日本大耳白兔，雌雄不限，体重为（2.5±0.2） kg，随机进行分组，分为对照组和实验组，对照组为21只；实验组为27只；先将实验组兔腰背部皮毛剪除，用安定注射液1.25 mg/kg、氯胺酮0.02 g/kg、阿托品0.125 mg/kg顺次耳缘静脉注射####后，俯卧固定于手术台上，用1%碘伏消毒手术区域，以髂嵴平对椎间隙（即L6、7）为中心，从正中取一长约4 cm纵行切口，切开皮肤及皮下组织，锐性分离，暴露棘突、椎板及上下关节突，将附着于棘突、椎板及小关节的肌肉全部分离开，然后依次切除L6、7棘上及棘间韧带，咬除第6腰椎两侧下关节突，造成椎间失稳，用无菌生理盐水冲洗切口，依次缝合各层组织；术后动物在笼中自由活动。

The main disadvantage of this method is that the tannase comes into the tea and it has to be inactivated by a heat treatment, which is detrimental to the quality of the treated tea, or by a precipitation method which also impair s the quality of the tea.

这个方法的主要缺点是丹宁酶进入到了茶中，因而必需用热处理来使丹宁酶失活，或用沉淀的方法来除去丹宁酶，但这两种方法都会损害所处理的茶的质量。

The main disadvantage of this method is that the tannase comes into the tea and it has to be inactivated by a heat treatment, which is detrimental to the quality of the treated tea, or by a precipitation method which also impairs the quality of the tea.

这个方法的主要缺点是丹宁酶进入到了茶中，因而必需用热处理来使丹宁酶失活，或用沉淀的方法来除去丹宁酶，但这两种方法都会损害所处理的茶的质量。

In 1973 the Institute of Chemical Metallurgy was engaged to carry out research on fluidizcd roasting of titaniferous iron ore containing vanadium, with the special objective of utilizing the local resources of natural gas and hydraulic electric power, by reduction of the ore with a hydrogen-rich gas followed by melting of the reduced cinder in an electric furnace in order to separate the iron from a slag rich in vanadium and titanium.

化工冶金研究所于1973年接受了&流态化焙烧还原钒钛铁矿&的任务，要求结合当地资源，用天然气还原铁精矿，用水力发电熔化焙砂，再从熔渣中提取钒和钛。我们对流态化还原的若干方面开展了试验研究，包括铁精矿还原反应数据的获得和有关分析，以及可供应用的两种流态化反应器的工程研究。第一种是气控式多层流态化床，第二种是快速流态化反应器。此外，对于流态化还原中的失流以及熔砂的渣～铁分离和从熔渣中提取钒钛，也进行了试验研究。

According to the diffraction theory used in DVD system, we propose a new theory to analyze the RF signal and tracking error signal of Super-RENS disk. Then we use simulate the tracking error signal under beam aberration. Finally we use FDTD method to simulate the tracking error signal at defocus.

我们亦根据传统光碟片的绕射理论，提出一新的架构用於分析此近场结构，并用此理论进行射频及偏轨信号的模拟；接著探讨在有像差产生的情形下，其对偏轨信号的影响，最后用有限时域差分法验证在失焦下，偏轨信号的变化。

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。