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Biodegradable Solid Polymers Spring 2003 Issued Day 1 Day 3 1. The chemical structure of a new degradable polymer, poly (ethylene glycol)-b-polylysine-b- poly (D, L-lactide)

1. (4 pts) An early study in the development of peptide-presenting biomaterials showed that polymer surfaces bearing RGD peptides at a density equivalent to -10 peptides per each cell was sufficient to promote cell attachment, spreading and subsequent cell growth. In contrast, when whole fibronectin protein was adsorbed to polymer surfaces, it was found that many more copies of the

A recent study of controlled release of a model small-molecule drug from poly (lactide-co-glycolide) microspheres prepared by the single-emulsion method found that the diffusion constant of the drug through the polymer was best related to the polymer's molecular weight according to

1. Re-derive the equation for equilibrium swelling of a polyelectrolyte gel where the polymer chains contain a basic ionizable group that becomes positively charged with decreasing pH

1. Re-derive the equation for equilibrium swelling of a polyelectrolyte gel where the polymer chains contain a basic ionizable group that becomes positively charged with decreasing pH

问答题 1.进行正截面承载力计算时引入了哪些基 本假设? 案 2.为什么要掌握钢筋混凝土受弯构件正截 面受弯全过程中各阶段的应力状态,它与 建立正截面受弯承载力计算公式有何关系? 3.什么叫少筋梁、适筋梁和超筋梁?在实 际工程中为什么应避免采用少筋梁和超筋 梁?

6问答题 1.轴心受压普通箍筋短柱与长柱的破坏形态有何不同? 答案

8.2习题 1.试说明公式T=0.7f对钢筋混凝土纯扭构件的意义? 答案 2.纵向钢筋与箍筋的配筋强度比的含意是什么?起什么作用?有什么限制? 案

一.物理学的研究对象 物理学研究物质世界的基本结构、基本 相互作用和最普遍的运动规律。 1物质:我们周围所有的客观实在. 物质存在的基本形式—实物和场