研究与开发

It is known that perforin plays an important role in the treatment of cancer,virus and parasite.

摘 要 穿孔素是机体发挥细胞毒作用的重要效应物质，在抗肿瘤、抗病毒及寄生虫治疗中有着重要的意义，但它在动物体内的含量极少，不便于进一步研究及新药开发，用基因工程方法来表达生产穿孔素是将小鼠的穿孔素基因在杆状病毒表达系统中进行克隆与表达。

With CAD/CAM integrated modeling technology and NC programming manufacturing to develop cold box process casting technology of engine cylinder block and cylinder head of linear four-cylinder,two-air valve mid-position cam,four-stroke direct-jet combustion chamber,drying cylinder sleeve turbocharged and oil intercooled diesel engine in accordance with EUROⅢ standard of automobile tail gas exhaust.

运用 CAD /CAM一体化复合建模与数控编程加工技术，研究开发了符合欧Ⅲ汽车排放标准的直列四缸、二气门中置凸轮、四冲程直喷燃烧室、干式缸套涡轮增压和机油中冷式柴油发动机缸体缸盖冷芯盒铸造成形工艺。

With the development of rail transit in modern cities and the construction of OCS in the tunnel with low headroom ,rigid catenary system are used in broad, now parameters inspection and evaluation about it have become a new hot focus in exploitation and study of catenary parameters inspection system.

随着城市轨道交通的发展和电气化改造中低净空隧道接触网的架设，刚性接触网得到愈来愈广泛的运用，对其参数的检测与评价是接触网参数检测系统开发和研究中的一个新热点。

With the development of rail transit in modern cities and the construction of OCS in the tunnel with low headroom ,rigid catenary system are used in broad, now parameters inspection and evaluation about it have become a new hot focus in exploitation and study of catenary parameters inspection system.

摘要随着城市轨道交通的发展和电气化改造中低净空隧道接触网的架设，刚性接触网得到愈来愈广泛的运用，对其参数的检测与评价是接触网参数检测系统开发和研究中的一个新热点。

About Xiangfan Xia Chu Building Materials Technology Co., Ltd. is specializing in building materials industry, especially cement kiln control and automation products, energy saving and environmental protection research and development high-tech enterprises.

公司简介襄樊楚夏建材技术有限公司是专门从事建材行业特别是立窑水泥企业的自动化控制与节能环保产品的研究开发的高新技术企业。

Ningbo Silvan Charcoal Co., point for developing , manufacturing and sale healthy bamboo charcoal prodcuts, which jointly cooperate with Qingyuan Zhuzhile Bamboo Charcoal Co., Ningbo Silvan Environmental Protection Material Institute, Ninghai Silvan Charcoal Manufacture Base, Fujian Zhenhe Manufacture Base, and own whole manufacture chain from bamboo base, charcoal manufacturing to charcoal products manufacture.

&浙江宁波·石门炭业&是一家致力于健康竹炭家居用品及生态资源开发、生产与销售的生态科技型企业组织，由宁波石门炭业有限公司、庆元县竹之乐炭业有限公司、宁波石门生态材料研究中心、宁海石门竹炭生产基地、福建政和竹炭生产基地等多家科研、生产实体组成，拥有从&竹林基地&到&竹炭烧制&到&炭制品加工&的完整生产链，是浙江林学院生态环境材料研究所的科研基地之一，也是当地重点扶持的农产品精深加工基地之一。

Therefore the development of the drive circuit of the lamp, namely ballast has become an important research point.

因此，与之相配套的高强度气体放电灯电子镇流器的开发也成为了研究热点。

From the point of space-economy integration, taking ChiFeng city as an example, qualitative and quantitative tourism resources were investigated,and the chart of comprehensive assessment, direction and levels of exploitation and utilizations of tourism resources about chiFeng city were put for ward .

本文从区域角度和空间经济一体化思想出发，以赤峰市为例，通过对旅游资源的定量与定性研究，得到旅游资源的综合评价图式，结合区际分析归纳出赤峰市旅游资源开发利用的方向和层次。

In the paper,the alternative characters of current electric conduction of rock-coal porous medium with gas are studied.

开展煤岩多孔介质及其充瓦斯后电性质的研究，对煤与瓦斯动力灾害的有效预防及煤层气的勘探开发具有重要的意义。

By means of high speed gas stream compound with coaxial cutting gas for pulsed Nd:YAG laser on cutting of ceramics,the technological parameters affected on the thickness of re cast layer and the exiting of crack in re cast layer were studied.

针对激光切割陶瓷产生的重铸层和裂纹，设计了超音速喷嘴，采用侧吹高速辅助气流与同轴切割气流复合技术，研究了激光加工工艺参数对重铸层及裂纹的影响规律，开发了获得最小重铸层厚度和裂纹长度的高效率激光切割方

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。