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Two kinds of water-soluble biomimetic chitosan derivatives with a phosphoramide linkage between glucosamine and choline were prepared through Atherton-Todd reaction under the mild conditions, including zwitterionic phosphorylcholine bound chitosan and acetyl-phosphorylcholine bound chitosan with positive charge. The interaction between chitosan derivatives and calf thymus DNA were inversigated by UV alsorption spectra and circular dichroism spectra.

采用Antherton-Todd反应制备了两种水溶性的磷酰化壳聚糖仿生衍生物：两性的N-磷酸胆碱磷酰化壳聚糖和带正电荷的N-乙基磷酸胆碱磷酰化壳聚糖，并用紫外吸收光谱和圆二色光谱研究了两种胆碱磷酰化壳聚糖衍生物与小牛胸腺DNA的相互作用。

Based on the deep research of structure characteristics of the shell-side of the shell-and-tube heat exchanger and laws of fluid flow and heat transfer, the concept of "sideling flow" in the shell-side is presented for the first time, which is relative to the flow states of the cross-flow, the longitudinal-flow and the helical-flow.

在上述壳程流体&斜向流&状态理念的指导下，首次研制开发了新型高效节能管壳式换热器—帘式折流片换热器，改进和发展了换热器壳程的结构形式，实现了壳程流体的斜向流动。

The mantle shear zone played an important role in continental blackup. Especially, the dissymmetry caused by simple shear deformation resulted in the different amount of extension in upcrust and subcrust, which in turn formed the detachment of the upper mantle from the crust, that is, the thinning positions of upper mantle and crust were different.

地幔剪切带在大陆裂解过程中起关键性作用，特别是简单剪切变形所产生的强烈不对称构造，以至壳上伸展量明显不同于壳下伸展量，壳幔明显折离，使得壳幔变薄区的位置明显分离，这将能很好地解释华北地台东部岩石圈地幔演化及其浅部盆地形成等的响应。

Based on the equipment, test results showed that: hulling rate was more than 75% and powder rate was less than 5%.

在此脱壳装置上进行的油菜籽脱壳试验结果表明，两次撞击法脱壳率大于75%，粉末率小于5

On the basis of analyzing the hulling methods and principles for general agricultural crop materials,combined with physical and mechanical properties of rapeseed,a hulling method of two-time striking was developed.

在此脱壳装置上进行的油菜籽脱壳试验结果表明，两次撞击法脱壳率大于75%，粉末率小于5%；随着油菜籽含水量的增加，脱壳率和粉末率降低；打板在主轴上的安装位置和打板高度均有最佳值。

Based on the equipment,test results showed that:hulling rate was more than 75% and powder rate was less than 5%.With an increase of rapeseed moisture content,hulling rate and power rate were increased.The fixed position on delivering axis and height of the striking board had the best value.

在此脱壳装置上进行的油菜籽脱壳试验结果表明，两次撞击法脱壳率大于75%，粉末率小于5%；随着油菜籽含水量的增加，脱壳率和粉末率降低；打板在主轴上的安装位置和打板高度均有最佳值。

Low molecular weight chitosan is prepared from breakdown of glycosidic bond of chitosan.

甲壳素是N-乙酰葡萄糖胺的聚合物，甲壳素脱乙酰后为壳聚糖，壳聚糖糖苷键断裂降解为低分子量壳聚糖。

The closed ring confining truss is set along the periphery of the reticulated shell, and the stiffening truss is set in the middle single-layer shell which can take advantage of the architectural shape. These measures resolve the contradiction between overall stability and temperature stress, and also avoid the shell thrust act on the lower concrete structure directly. Besides, these measures simplify the design of the shell bearing and the concrete structure, and the cost of the concrete structure can also be saved.

网壳通过可径向滑动球铰支座与下部混凝土结构连接，网壳周边设置封闭环形约束桁架，中间单层壳体部分利用建筑凸肋造型设置加劲桁架，解决了保证整体稳定和减小温度应力之间的矛盾，同时避免了网壳侧推力直接传递给下部混凝土结构，简化了网壳支座及下部混凝土结构的设计，节约了混凝土结构的造价。

Design calculaton method of the increase in flow is not only applicable to the design of the low specific speed self- priming pump with single volute and outside mixture but also is abblicable to the design of the low specific speed self- priming pump with douple volute inside mixture and outside mixture.

增大流量设计计算法不仅适用于低比转数单蜗壳外混式自吸泵，同样也适用于低比转数双壳外混式和双蜗壳内混式自吸泵的设计。

Hermaphrodites exist in oyster groups and the rate of hermaphrodites reduced with the increase of ages.

雌体的壳高、壳宽、体质量和软体部质量都明显大于雄体（P〈0.05），但雌雄两性在壳长方面差异不显著。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。