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In this article, the latest progress in the study of DNA condensation in vitro induced by multivalent cations is reviewed covering the mechanism, process, influencing factors of DNA condensation and its recent applications in gene transfection.

本文综述了近十几年来以多价阳离子为缩合剂诱发的DNA体外缩合的研究进展，着重介绍了缩合的机理、过程、影响缩合的因素以及应用于转基因的最新成果。

Blocked by the scheduled project, the tidal current near the coast will move around the project. 4. Changes of SSC before and after the project The general characteristics of the SSC both before and after the scheduled project are as the following: the SSC is lower in the waters of the project ranging from 11 mg/L to 19 mg/L; the SSC isolines are generally parallel to the isobaths, decreasing towards the coast; the SSC in flood tide is higher than that in ebb tide, so are high tide and spring tide than low tide and neap tide, respectively.

4工程前后悬沙量变化工程前后悬沙分布的基本规律：在工程海域，悬沙量均保持为较低值，大致为11～19mg/L；悬沙等值线基本平行于等深线，随深度的减小浓度减小，一般到近岸区达到最低；悬沙量的日周期性变化规律明显，悬沙量涨潮时大于落潮时，高潮时大于低潮时，大潮时大于小潮时。

They are often morphologically distinct from A chromosomes, being smallerand more highly heterochromatic in most cases. B chromosomes do not pair with Achromosomes, and they are inherited in a non-Mendelian way, exhibiting meiotic andmitotic instability and nondisjunction. However, B chromosome DNA is quiteidentical to the corresponding sequence on the A chromosome complement. So far afew B chromosome specific DNA sequence have been identified. Specific DNAsequences on B chromosome have been the attractive research area on Bchromosomes.

现已在千余种植物和近三百种动物中被发现。B染色体与物种中正常染色体不同：独立于整倍体基因组之外，减数分裂时不与A染色体发生联会和配对，细胞分裂后期不分离，非孟德尔遗传，富含异染色质，不含对宿主主要性状有影响的基因等。B染色体DNA的分子组成既与A染色体极为相似，具有A染色体DNA分子组成的一般特征：富含重复序列和转座成分，染色体三大功能组件DNA高度同源；又与之相区别，含有B染色体特异的DNA序列，这些DNA序列可以为探讨B染色体的起源和进化提供有价值的信息。

The output of building construction completed in the latest 5 years is approximately equivalent to the total of European in 30 years, one European officeholder said.

引用一位欧洲官员的评语来说："中国在近5年内完成建设工程的规模，相当于欧洲在30年内完成的总量。"

Finally it was found that the present of Oligochaetes not only brought better characteristics of the sludge such as good settleabilily, but also minished the membrane fouling greatly, and did not affect the effluent quality. And most important of all, in the case of almost no sludge production discharged, MLSS could be kept nearly 4000mg/L in more than 40 days when Oligochaete was present, which meant that there was no sludge production in the process.

同时，试验还发现大量蠕虫的存在，对出水水质的影响不大，但能够改善污泥特性，减缓动态膜污染，污泥浓度能自平衡于4000mg/L左右；并在近40天内，在没有排泥的情况下，无污泥量的增加，即实现了减量剩余污泥排放。

A vernier optometer,based on the Scheiner principle,that makes use of polarized light,is designed and developed.

介绍一种根据Scheiner氏盘原理研制的偏振光游标式调节检测仪，专用于人眼张力性调节、调节反应和远、近点的测量。

In addition, the magnetic noose tool was used to outline the contour line of inside and outside boundary, and obtain the inside and outside contour line of every layer of the femur. The rabbit femur was scanned by industry CT starting from the upper extreme of the femur, vertical to femoral ordinate axis line (slice space=1 mm).

再用磁性套索工具勾勒各层图像的内、外边界线，得到各层面股骨内、外轮廓曲线，采用CT 扫描机对兔股骨进行扫描，自股骨头上端起，由近端向远端垂直于股骨纵轴行CT 扫描，层间距为1 mm。

Gansu · Changyeh Orrin the Bell biotechnology Limited company is specialized devotes to the poultry aquatic product cattle and sheep with compound feeds front end and so on Vitamin, compound pre-mixture, feed additive the product researches and develops the production marketing the High-tech enterprise; The company relies on the northwest farming and forestry Scientific and technical university, China Agricultural college and the Chinese Agriculture Academy of science's of technical superiority numerous experts and professors, as well as the national feed engineering technology Research center in the technical stratification plane's close cooperation, and unifies in the recent ten years for the domestic feed enterprise, the breeding farm to provide the product the practice and the optimization design feed formula service experience.

甘肃·张掖奥林贝尔生物科技有限公司是专业致力于畜禽水产牛羊用复合维生素、复合预混料、饲料添加剂等饲料前端产品研发生产营销的高科技企业；公司凭借西北农林科技大学，中国农业大学和中国农业科学院的众多专家教授之技术优势，以及国家饲料工程技术研究中心在技术层面的紧密合作，并结合近十年为国内饲料企业、养殖场提供产品的实践及优化设计饲料配方服务的经验。

Curve the incision just proximal to the medial malleolus (Fig. 1-33, A) and divide the malleolus with an osteotome or small power saw; preserve the attachment of the deltoid ligament.

于内踝稍近侧做弧形切口(图1-33A)，用骨凿或小的动力锯截断内踝，保留三角韧带的附着点。

Cure the incision just proximal to the medial malleolus (Fig. 1-33, A) and diide the malleolus with an osteotome or small power saw; presere the attachment of the deltoid ligament.

于内踝稍近侧做弧形切口(图1-33A)，用骨凿或小的动力锯截断内踝，保留三角韧带的附着点。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。