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Vaccination:
Now let us see how vaccination protects us from disease. We have mentioned above that the W.B.Cs. produce antibodies which neutralise the toxins produced by the invaders. These W.B.Cs. are of different kinds and each kind consists of millions of cells which recognise and combat a specific foreign invader. Once a class of W.B.Cs. has encountered a particular kind of invader, it develops memory and is thus trained to ward off future attacks. In this way the body becomes "immune" to that infection and the process is called immunisation. Thus, our body regularly develops natural immunity as a variety of fighting cells are produced by actual attacks of infectious agents. Artificial immunisation is a clever idea. It is done through "vaccination", that is by artificial introduction into the body of a weak infection, which triggers off a defence mechanism, and produces W.B.C. trained to combat that particular infection.
Non-Specific Defence Mechanism The non-specific defence mechanism is implemented for different types of infections. It resists infection in two ways, firstly, by blocking the e
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Requirements Autoclave Microbial cultures - liquid/solid Disinfectant Spatula Disposable bags
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Define the functions of platelets The main function of platelets, or thrombocytes, is to stop the loss of blood from wounds, i.e. haemostasis. Let us learn about this function.
Define Universal Donor and Recipients Based on the above mentioned concept, O group individuals are sometimes considered as 'universal donors ', since they have no antigens an
Soil Texture and Methods of Analysis Soil texture is the basic property of a soil related to the size of individual mineral particles, which cannot be easily altered. It spe
Give the common name of the historic mineral that was the original source of radium and the first substance in which helium was discovered on earth: Pitchblende
As glaciers erode the surface over which they move, sets of parallel linear grooves are sometime worn into the rock surface. These grooves are known as: Striations
Corrosive Substances : These substances cause severe damage by chemical action when in contact with living tissue or in case of leakage, destroy /damage other materials. Mineral a
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