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Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。

Thymus index, milt index and bursa of Fabricius index were measured and lymphocyte proliferation of peripheral blood and milt was detected.

试验期42 d。试验结束后，测定各组胸腺、脾脏和腔上囊系数及外周血和脾脏淋巴细胞的转化率。

And 4 of experimental group and 2 of control group were killed at 1, 3, 5, 10, 14, 20, 25 and 30 days postinfection, respectively. All the sera, the lymphocyte suspension of peripheral blood, thymus, Fabricius bursa and spleen, were collected.

本研究用AEV-NH937株组织毒1∶100倍稀释，0.03ml／只脑内接种1日龄SPF雏鸡，分别在攻毒后1、3、5、10、14、20、25和30天迫杀实验攻毒组4只，对照观察组2只，分离血清，制备外周血、胸腺、法氏囊和脾脏的淋巴细胞悬液，同时采集脑组织，10％福尔马林固定，制备石蜡切片，做H.E。

It is a useful and practical way to reconstruct the three-dimensional structure of fasciculus in the peripheral nerve by taking human hair as the registration material and combining with soft-aided registration method.

采用人发作为定位材料，同时借助计算机软件辅助定位的方法，人体坐骨神经内部神经束三维结构的重建取得较好的效果，因而是一种较为实用的周围神经内部神经束三维重建的方法。

The upper member of the protective cover generally overlies the upwardly facing surface of the robot arm while the peripherally extending sidewall generally overlies the outwardly facing surface of the peripherally extending sidewall. In similar fashion, a protective plate of thin-walled plastic material impervious to fluids may also be removably attached to the downwardly facing surfaces of the robot arm and includes a peripheral rim generally coextensive with the peripherally extending sidewall of the link and proximate the lower rim of the protective cover when both the protective cover and the protective plate are so attached.

以相似的方式，一个由液体不能透过的薄壁塑料制成并且也被可拆卸地固定在该自动臂的下工作面(34)上的保护板(46)，该保护板包括一个周边边缘(48)，当保护盖(38)和保护板(46)都这样地固定在该自动臂上时，该周边边缘大体上与该连杆的沿周边方向延伸的侧壁(36)共同地延伸，并且靠近该保护盖的下边缘。

In order to achieve uniform distributing water along the distributing water trough of peripheral feed sedimentation basin and improve the effect of the sedimentation basin,an equation of the water surface curve along the uniform distributing water trough and its hydraulic calculation were preliminarily discussed.

为使周边进水沉淀池的配水明槽均匀布水，提高沉淀池的沉淀效果，对沿程均匀配水槽的水面曲线方程及其计算进行了初步探讨。

During reperfusion, the number of premature ventricular complexes(134 ± 50) was reduced to 9 ± 5 by FENT 50 andwas prevented by central (42 ± 4) as well as peripheral(20 ± 11) OR blockade.

在灌注期间，使用 FENT 50时心室合成物前体数量降低（由134 ± 50降至9 ± 5），当中枢和外周 OR 阻滞时，这种保作用都减弱（分别为42 ± 4、20 ± 11）。

The number of premature ventricularcomplexes during the ischemic period (54 ± 3) was reducedby FENT 50 (19 ± 7), an effect blunted by central (40± 3) but not peripheral (18 ± 7) blockade of OR.

使用 FENT 50时，缺血期间心室合成物前体数量降低（由54 ± 3降至19 ± 7），而当中枢 OR 阻滞时，这种保作用消失（40± 3），外周 OR 阻滞时没有影响（18 ± 7）。

Objective : The effect of basic fibroblast growth factor on the peripheral nerve was studied.

目的：探讨碱性成纤维细胞生长因子对神经再生的影响。

Methods :According to WHO(1992)classification of odontogenic tumours, 35 cases of peripheral odontogenic fibroma were studied clinicopathologecally.

按WHO(1992)牙源性肿瘤分类标准对35例周边型牙源性纤维瘤的临床病理资料进行回顾性分析。

As a dominant party,CPC government should play a guardian,supervisee and guarantee role to overcome all the difficulties in the development of charitable cause and bring it into full play in the establishment of harmonious society on policies and regulations basis.

在中国共产党的文献中第一次把发展慈善事业提到&最广泛最充分地调动一切积极因素，不断提高构建社会主义和谐社会的能力&的高度来认识。近年来，社会学界对慈善事业的理论专著发表较多，有鉴于此，笔者不揣浅陋，谈谈自己的认识和见解。

Flow through the land, the land of the scale of operation allows the effectiveness of the land may be raised.

通过土地的流转，土地的规模经营可以让土地的效益得到提升。