细菌代谢调控机制的系统性：初论从分子水平理解细菌代谢调节的系统性

利用系统科学的基本原理,从分子水平上对细菌代谢调节,功能网络及其与外界环境的关系进行了初步探讨,得出了细菌代谢调节系统性的一般结论.     

Pathways for oxidative fuel provision to working muscles: Ecological consequences of maximal supply limitations

The study of metabolic fuel provision and its regulation has reached an exciting stage where specific molecular events can be correlated with parameters of the organism's ecology. This paper examines substrate supply pathways from storage sites to locomotory muscle mitochondria and discusses ecological implications of the limits for maximal flux through these pathways. The relative importance of the different oxidative fuels is shown to depend on aerobic capacity. Very aerobic, endurance-adapted animals such as long distance migrants favor the use of lipids and intramuscular fuels over carbohydrates and circulatory fuels. The hypothesis of functional co-adaptation between oxygen and metabolic fuel supply systems allows us to predict that the capacity of several biochemical processes should be scaled with maximal oxygen consumption. Key enzymes, transmembrane transporter proteins, glucose precursor supply and soluble fatty acid transport proteins must all be geared to support higher maximal glucose and fatty acid fluxes in aerobic than in sedentary species.     

恒压供水变频控制系统

变频控制供水系统先进的工作原理及实施方法,克服了传统的供水系统浪费较大、稳定精度较差的缺点,可以取得较大的经济效益。详细论述了这种系统的节能工作原理及实现方法。     

太原市东山热电厂和调峰热源厂双热源并网设计

根据太原市集中供热总体规划,确定在东山新建二台64MW的调峰热源厂。针对供热系统并网的特殊情况和地形条件,通过对水压图和可行性进行理论分析,提出了在热电厂供水管网上增设加压泵的技术措施。使双热源并网运行技术可行、安全可靠、高效节能。     

浅析法律文书语言的精确性与模糊性

法律文书由于具有很强的专业性,因而也就具有应用文书的一般写作特点,尤其在语言的精确性方面要求甚严,但模糊语言的恰当运用,同样能不偏不倚地准确表意,使文书能达到其基本地的使用目的。     

Internalization of polypeptide hormones and receptor recycling

Conclusion The insulin receptor is an integral protein of the plasma membrane of the cell. It is composed of two subunits: an subunit, which binds the hormone, and a subunit which is a tyrosine specific protein kinase capable of undergoing autophosphorylation. These independent subunits are synthesized by way of a higher molecular weight single chain precursor and thus are the product of a single gene^{29, 49, 85} localized to chromosome 19^{29, 91}. Assuming that the insulin receptor is synthesized in the same fashion as other integral membrane glycoproteins, then the nucleus, the rough endoplasmic reticulum, and the Golgi apparatus are involved in its biosynthesis. Further, there must be some form of transport of the mature receptor subunits to the plasma membrane where they are inserted.By contrast, the endocytotic route involves coated pits, coated vesicles, large clear vesicles or endosomes, multivesicular bodies and other lysosomal forms. In addition, it is possible that some other as yet unidentified organelle is involved in recycling (fig. 8). At the present time, with respect to the insulin receptor, the biosynthetic pathway and the endocytotic pathway appear to be separate. Further, it does not appear that either pathway, i. e. synthesis or endocytosis, exerts a regulatory function over the other.     

一种新型的无刷同步电动机

改进逆序串激式无刷同步电动机在结构上和电气上的缺点,提出一种新型的励磁方式,以获得结构和电气性能更优的无刷同步电动机。方法应用 自控和斩波技术,实现励磁电流的自动调节。     

盐胁迫下灰绿藜叶片光合特性与叶绿体离子调节的研究

ＮａＣｌ处理后,灰绿藜整个叶片内Ｎ＾＋ａ和Ｃｌ＆－积累,但叶绿体内仅少量增加。叶绿体与叶片的Ｋ＾＋浓度都降低。     

电动势负反馈直流调速系统研究

在分析了电压负反馈直流调速系统的优缺点基础上,本文提出了电动势负反馈调速方法,并给出了该方法的系统图、框图和静特性。对电动势负反馈双直流电动机调速系统也进行了探讨。文中还对电动势负反馈直流调速系统的优缺点和应用范围加以了分析。     

交流调速系统的自学习控制

本文介绍了Ｉ／Ｏ映照记忆模型自学习控制的理论和方法,并用其为具有重大节能意义的泵类、风类机类等交流调速装置设计通用的智能控制器,以实现对期望转速的跟踪控制．文中给出了统一的系统模型描述、学习控制原理及初值控制的处理方法．