ne system assume different roles in pro- the host. The effectors of the humoral molecules f cells Big CTL Attacks Little Tumor Cell Effector Responses General Properties of Effector Cells Cytotoxic T Cells Natural Killer Cells Antibody-Dependent- Cell-Mediated- Cytotoxicity Experimental Assessment of Cell-Mediated Cytotoxicity

effector molecules that act to remove antigen b ren various mechanisms described in previous chap es antigen without A Second Exposure to Poison Oak May Result in Delayed-Type Hypersensitivity Gell and Coombs Classification IgE-Mediated (Type I) Hypersensitivity Antibody-Mediated Cytotoxic(Type) Hypersensitivity aImmune Complex-Mediated (Type Ill) Hypersensitivity

the early vaccination trials of Edward Jenner and oneering efforts, vac nce of diseases such ng cougl Vaccination with DN A Active and Passive Immunization Designing Vaccines for Active Immunization mWhole-Organism Vaccines Purified Macromolecules as Vaccines Recombinant-Vector Vaccines DNA Vaccines Multivalent Subunit Vaccines mmon usage. Experience has shown that not every vaccine

realized that the immune system could go awry and, instead of reacting against foreign antigens, could focus its attack on self-antigens. He termed this con- dition\horror autotoxicus \We now understand that while mechanisms of self-tolerance normally protect an individual from potentially self-reactive lymphocytes, there are failures They result in an inappropriate response of the immune system against self-components termed autoimmunity In the 1960s, it was believed that all self-reactive lymphocytes

has declined become the se led only by heart di person in three in the that one in five will die spective, cancer cells ca ch ing particular a Cancerous melanoma cells. nized by the ir d cers Cancer: Origin and Terminology The final section des

1. An overview of potable Water filtration 1.1 Concept of filtration The filtration processes discussed in here are used primarily to remove particulate material from water

2. Filter media 2.1 Types of media 石英砂 无烟煤 过滤作用 石榴石 钛铁矿

4.普通快滤池 4.1概述 快滤池:利用滤层中粒状材料所提供的表面积,截留水中 已经过混凝处理的悬浮固体的设备。 滤池反冲洗的判断指标

6.快滤池的运行 6.1出水水质的一般状况 滤后水水质在过滤周期开始时一般较差,如果周期延长足够的时间,在过滤末期水质也会下降

8.1流量控制的必要性 如果不进行流量控制,滤池将无法合理的分配整个水厂 的总水量,或者应对流量的突然变化,这两种情况都会对滤后水水质带来影响。 8.2重力式滤池的滤速控制系统目前使用的滤池控制系统可以分为两类:机械控制系统和非机械控制系统。控制系统也可以分为等速系统和减速系统