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Anatomic barriers
These block the entry of organisms into the body. The skin and mucous membranes of the body possess certain mechanical factors and chemical factors that are involved in combating the initial attempt of a microbe to cause a disease. Mucous secreted by the membranes being slightly viscous, entra..
Energy Barrier
Energy Barrier - In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp b (19) where Z is the collision frequency f is the fraction of collisions having energy greater than the threshold energy and p is the fraction of the collisions that occurs w..
Energy Barrier - In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp b (19) where Z is the collision frequency f is the fraction of collisions having energy greater than the threshold energy and p is the fraction of the collisions that occurs w..Chemical Barriers
The skin and mucuous membranes secrete certain chemical which dispose of the pathoge..
Phagocytic barriers
Phagocytosis is an important mechanism of innate immunity. Whenever there is an infection in the body, the total count of Leucocytes increase..
Energy Barrier
In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp..
Energy Barrier
In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp b (19) where Z is the collision frequency f is the fraction of collisions having energy greater than the threshold energy and p is the fraction of the collisions that occurs with the reactant molecules ..
In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp b (19) where Z is the collision frequency f is the fraction of collisions having energy greater than the threshold energy and p is the fraction of the collisions that occurs with the reactant molecules ..Barrier protection
The metal surface is not allowed to come in contact with moisture, O 2 and CO 2 . i) Coating the metal surface with paint. ii) Applying oil or grease. iii) Electroplating with non-corroding metals like Ni, Cr, Al, Sn, Zn. iv) Coating with alkaline phosphate (anti rust) solutio..
Energy and Orientation Barriers to Reactions
From Arrhenius equation, it is seen that the rate constant k of a reaction increases with temperature and therefore, the rate of reaction also increases. Why does k depend on temperature? This can be explained, to a certain extent, by collision theor..
6) Dams
Barriers constructed across rivers to prevent floods submerge and kill large tracts of forest..
e. Herkogamy:
It is a condition where some sort of a barrier is formed between the stigma and the stamens of the same flower. The barrier may be in the form of a hood covering the stigma or anthers, and stigma may lie at some distance from the anther or the stigma might become sticky and rec..
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