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Because the dimeric form is the active form to exert its biological activities, many trials failed to express TGF β s in prokaryotic systems because of their complex folding manner and disulfide patterns. In 1991 Cerletti and coworkers from Ciba-Geigy Corporation in Switzerland successfully finished the functional expression of human TGF β 2 in bacteria, but the details are protected by the patent.

由于双体是其发挥生物活性的形式，TGF β复杂的折叠方式和二硫键配对使其早期原核基因工程研究都以失败而告终。1991年，瑞士Ciba-Geigy公司的Cerletti等成功完成了人TGFβ2基因的细菌表达，但其技术细节被专利加以保护。

Periostracan cicadae ; rats ; uterus smooth muscle ; BL-420 biological signaling system

蝉蜕；大鼠；子宫平滑肌； BL-420生物信号系统

Methods: To observe the effect of different dosage periostracan cicadae decoction on the spontaneous activity of uterus smooth muscle in pregnant rats by BL-420 biological signaling system writting down the activity of isolated uterus smooth muscle.

运用BL-420生物信号系统记录未孕大鼠离体子宫平滑肌条的活动，观察不同剂量蝉蜕水煎剂对子宫平滑肌自发活动的影响。

According to the results from this study, biological samples for detecting Cu contents can be treated under regular cineration temperature, while those for Zn and Pb are much better to be treated with low temperature cineration technique.

根据本研究结果可知，测定Cu含量的生物样品可用常规灰化温度进行处理，而测定Zn和Pb含量的生物样品宜用低温灰化技术进行处理。

Both extracts and monomer CA-1201 from Chinese herb Cissus assamica can antagonize ET-1 biological effects.

红背丝绸 2种提取物和CA-1201可拮抗ET-1的生物学效应。

OBJECTIVE: To observe the antagonism effects of both alcohol and ethyl acetate extracts, monomer CA-1201 three components from Chinese herb Cissus assamica on endothelin-1 (ET-1) biological responses in vivo and in vitro.

目的：观察红背丝绸2种提取物和单体(CA-1201)对内皮素-1(endothelin-1，ET-1)生物效应的拮抗作用。

Industrial orientation: Scientific research, biological technology, ocean usage technology, instrument, electronics assembly, city light industry.

产业定位自然科学研究、生物技术、海洋利用技术、仪表仪器、电子装配、都市轻工业。

An adaptive network policy management model is presented in this paper,and it is based on the theory of classical conditioning,which is a basic learning mode of biological system.

2基于现有的条件反射模型的研究和条件反射学习算法，构建了一种新的基于条件反射的自适应策略管理模型。

In view of their theoretical and practical significant importance in the investigation of sophisticated biological topics, and in the development of novel drugs and new biochemical tools, DNA intercalators and cleavers have received much current interest This dissertation focuses on synthesis of hetrocycles containing naphthalene moiety and on the mechanism of their interactions with DNA.

DNA嵌入、切断剂的研究，对探索生命科学中的复杂问题，发展新药、新型生化工具具有非常重要的理论和实际意义，成为当前多学科的研究热点。本文从我国国情出发，以国内资源丰富的萘类化合物为基点，设计、合成了一系列多杂环平面刚性分子，并对某些化合物与DNA相互作用的分子机理进行了研究。

Therefore, with some engineering and biological measures, after some pioneer trees are planted in extremely degraded tropical areas,the pioneer forest should be reformed by multilayer and multispecies broad leaved mixed forest in time, wihich could accelerate the development of artificial forest into local climax community.

因此，对于极度退化的热带丘陵台地区，在一定工程和生物措施基础上，用先锋绿化树种造林成功后，及时用多层多种的阔叶混交林改造原有先锋林，可以加速人工林向地带性植被类型演替。

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。