从无变化的

Anaximander, a disciple of Thales, maintained that the first principle from which all things evolve is an intangible, invisible, infinite substance that he called apeiron ,"the boundless."

Anaximander是Thales的弟子。他的首要原则是主张所有物质都是从虚无物变化来的，这种物质无实体，不可见，不确定。

After repeating 5 times, the result shows that the genome DNA can be extracted from the fresh specimens by the methods ,but fail to be extracted from the preserved specimens with the same methods through electrophoresis.

经 5次重复实验，结果表明，用两种方法均能从新鲜标本中获得较完整的DNA ，且DNA得率较高；而对于无水乙醇保存的标本，提取出的DNA用琼脂糖凝胶电泳检测不出DNA条带，说明标本在保存过程中DNA可能发生了变化，致使提取出的DNA量太少或未分离出DNA 。

A virus strain was isolated from the arthrosis of broiler chickens.The virus was shown to have spherical particles with isometric symmetry,no envelope,double deck capsids,with outer capsid of 75nm,inner one of 50nm in diameter by electron microscopy.The virus was not sensitive to aether,acid and heat.The virus could multiply on the chick embryo fibroblastcell,and could cause syncytial pathologic change with the appearance of cytoplasm inclusion bodies.The challenged chickens of one-day old by nasal,oral,intramuscular and pulvillus injection displayed obvious clinical symptom of severe arthritis and accompanied with pathological changes of malabsorption and necrosis.Meanwhile,four avian reovirus isolates CL,S1133,YH and YB were examined in the cross-neutralization test.

从临床患病鸡关节病料中分离到一株病毒，在电镜下观察到病毒粒子无囊膜，有双层衣壳，外衣壳直径约75nm，内核约50nm；分离病毒株对酸、热有较强的抵抗力，对乙醚不敏感；病毒感染鸡胚成纤维细胞上能产生以融合细胞为特征的CPE；爪垫接种1日龄雏鸡表现出明显的病毒性关节炎临床症状，并伴有吸收障碍型和坏死型的病理变化；血清中和交叉试验表明，该病毒分离株与国内的2株番鸭源呼肠孤病毒分离株和国外S1133呈不同程度的交叉反应。

With determining and comparing the result of the output of chlorine dioxide, the purity of chlorine dioxide, the rate of chlorine dioxide, the capacity of active chlorine and the output of chlorine generated by positive pressure type chlorine dioxide generator under different pressure, this paper draws the conclusion that the effect of pressure to aerogenesis efficiency of chlorine dioxide generator is indistinctive when the pressure is in the range of 0～0.6M Pa.

从化学平衡角度分析，压力增加会抑制正向反应的进行。为了验证实际效果是否如此，本文通过在不同压力下对正压式反应器 ClO2产量、纯度、得率及总有效氯产量等指标进行测定与比较得出，在 0～0.6M Pa的常用压力下，压力的变化对二氧化氯发生器的产气效率无显著影响。

The time to losing eyelash reflex and intubation were recorded .The incidence of cough ,apnoea ,and laryngospasm during the induction period were recorded too. The variety of MAP、HR、SpO2% were recorded in the every time point of induction. The data was analyzed with SPSS software.

记录两组从诱导开始至意识消失时间，插管时间，有无插管反应（呛咳、屏气、喉痉挛及支气管痉挛），记录诱导前、诱导后、插管即时和插管后2min各时间点的HR、 SpO2%及MAP变化，用方差分析和t检验进行统计学的分析。

On longitude gradient, from east to west, there is a slight trend of diversity of Lauraceae plants, and no obvious trend was observed on specification strength. In general, the distribution center of Lauraceae plants is in the southern part of the study area with low latitude and altitude(elevation 1500-2000 m or so).

区系分化强度与纬度呈负相关关系，区系分化中心可能在低纬度地区；在经度梯度上，从东到西，樟科植物的多样性呈轻微递减趋势，但区系分化强度无显著变化；总体上，研究区域内樟科植物的多样性分布中心集中在低纬度、中低海拔（海拔1500-2000m左右）的南部地区。

Mol-1 of ozone are compared to those from the control run, indicating that from the heading to mature stage contents of chlorophylls a and b as well as the total increase first and then drop, but the carotenoid content and the value of value of chl a/b keep steadily rising and declinling, respectively, there is no significant decrease in the net photosynthetic rate and stomatic conductance during the early stage of heading but their drops increase gradually with prolonged smoking time.

mol-1的O3处理下，与对照相比，从抽穗期到成熟期冬小麦叶绿素a、叶绿素b和总叶绿素含量均呈先上升后降低的变化趋势，而类胡萝卜素的含量和Chla/b的比值则分别持续升高和下降，净光合速率和气孔导度在抽穗初期无明显下降，但是随着熏蒸时间的增加下降幅逐步变大。

Finally, the pH value, lactic acid, water soluble carbohydrate, ammonia nitrogen and cellulose contents were determined for WH silage prepared under the suitable adding doses of lactobacillus and cellulase at day 1, 3, 5, 15, 25, 35 after ensilaging. The pH value decreased from 5.5 before ensiling to 4.3 on the 35th ensiling day, whereas the reverse change tendence was observed for lactic acid content. The cellulose content of silage was lower from 26.5%DM in raw material to 22.3%DM.

结果表明：pH值由青贮前的5.5至青贮第35天时降至稳定的状态，而乳酸含量的变化趋势相反；凤眼莲茎叶纤维素含量从未青贮前的26.5%干物质，至青贮第35天降至22.3%干物质，降低了约4个百分点；青贮料中可溶性碳水化合物的含量随青贮时间的延长而逐渐下降，但是在第5天到第15天的时间段里，可溶性碳水化合物的含量无显著性下降；氨态氮占总氮的比例从青贮第1天的4.61%显著上升至第5天的8.25%，而从第5天开始到第35天，氨态氮占总氮的比例上升的幅度较小。

The mechanical behaviour of the bridge with and without middle diaphragm s in the loading-failure process is investigated in great detail.

以虚拟层合单元程序为基础，综合考虑结构的几何非线性和材料非线性，对一典型5跨简支连续小箱梁桥结构的极限承载力进行了分析，重点考察了在有、无跨中横隔梁时，结构从加载到破坏的全过程中受力性能的变化。

Then,the left external carotid artery of 40 adult New Zealand White rabbits were ligated,which reduced the pulsatile shear stress of left common carotid significantly (for example, mean=21.16 ± 7.17 vs 3.13±2.28 dynes/cm2, p=2.176E-21)and did not change the pulsatile shear stress of right common carotid significantly.

结果左颈外动脉结扎后即刻兔的左颈总动脉形成脉动低切应力以τ_(mean为例，从21.16±7.17dynes/cm~2降至3.13±2.28dynes/cm~2，p=2.176E-21，并一直持续至结扎12周后；而右颈总动脉脉动切应力始终无显著变化。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐