The plasma membrane has a dual responsibility as a selective ely permeable barrier and transductor. The plasma membrane regulares the traffic of molecules into and out of the cell. Gases and small hydrophobic molecules by passive diffusion transport; Ions, sugars, amino acids, and sometimes water must be transported by a group of integral membrane proteins including

TSINGHUA SCIENCE AND TECHNOLOGY ssN100702142325pp43-445 Volume 5, Number 4, December 2000 Interaction of Divalent Metal lons with the Adenosine Triphosphate Measured using nuclear magnetic resonance

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病态科学,原文 Pathological science,是美国著名化学家 Irving langmuir 在1953年的一次报告中首先提出的。 L Langmuir是1932年诺贝尔化学奖的获 得者,同时他在物理学中也有贡献。例如等离子体物理中著名的等离子体振荡 有时也称为 Langmuir振荡,但他本人除了研究化学和物理学外,还花了不少时 间研究自然科学发展本身的一些重要现象,并总结出病态科学的概念。但有关 这方面的研究文章,在他生前从未发表过,只是在他去世后,有人将他1953年 的题为“病态科学”的报告根据录音整理成文

Sociological Lessons from the Titanic ll. Defining Sociology A. Is it a science? And what does this mean? B. What are social facts? Why was Durkheim's study of suicide so important? C. What do sociologists study? (What is their unit of analysis?) E. Is sociology micro or macro? Do they study the big picture or the little picture? F. Is sociology global? In what sense?

Statics, Dynamics and Mechanical Engineering 1、 Introduction Mechanics Science which describes and predicts the conditions of rest or motion of bodies under the action of forces The field of Classical mechanics can be divided into three categories 1)Mechanics of Rigid Bodies

Chapter 2 Supercritical fluid extraction and its application in the food industry DAVID STEYTLER, School of Chemical Sciences, University of East Anglia, Norwich NR4 7TJ 2.1 INTRODUCTION Solvent extraction is one of the oldest methods of separation known and certainly dates back to prehistory. The science of solvent extraction has evolved accordingly over a long period of time and much progress has been made in the understanding of solvation and

Chapter 4 Ultrafiltration M.J. LEWIS, Department of Food Science and Technology, The University of Reading RG6 6AP 4.1 INTRODUCTION Ultrafiltration offers the opportunity to concentrate large molecular weight components without the application of heat or a change of phase. Such components are rejected

Chapter 6 Ion-exchange and electrodialysis ALISTAIR S. GRANDISON, Department of Food Science and Technology, The University of Reading, Reading RG6 6AP, UK Ion-exchange and electrodialysis are distinct methods of separation, but can conveniently be treated together, as the basic criterion for separation in both cases is the molecular

Chapter 9 Solids separation processes M.J. LEWIS, Department of Food Science and Technology, The University of Reading RG6 6AP 9.1 INTRODUCTION This chapter will cover the separations involving solid foods, together with the propertie