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Define Role in growth and cellular Differentiation?
The growth and differentiation of epithelial cells throughout the body are especially affected by vitamin A deficiency. In addition, goblet cell numbers we reduced in epithelial tissues and as a consequence, mucous secretions diminish. Cells lining protective tissue surfaces fail to regenerate and differentiate; hence they flatten and accumulate keratin. Classical symptoms of xerosis (drying or non-wet ability) and desquamation of dead surface cells as seen in ocular tissue (i.e. xerophthalmia) are the external evidence of the changes also occurring to various degrees in internal epithelial tissues. Current understanding of the mechanism of vitamin A action within cells outside the visual cycle is that cellular functions are mediated through specific nuclear receptors. Binding with specific isomers of retinoic acid (i.e.all Tran- and 9-cis-retinoic acid) activates these receptors. Activated receptors bind to DNA response elements located upstream of specific genes to regulate the level of expression of those genes. These retinoid-activated genes regulate the synthesis of a large number of proteins vital to maintaining normal physiologic functions. There may, however be other mechanisms of action that are as yet undiscovered.
Non-nucleoside reverse transcriptase inhibitors (NNRTIs) - These drugs are direct, non-nucleoside inhibitors of HIV-1 reverse transcriptase. Combinations of an NNRTI with NRTIs
what is atp explain in detail?
Dry Stigma - Category of Stigma The Cotton (Gossypium hirsutum) stigma is covered with long unicellular hairs. At the time of pollination, the stigmatic hairs show a distinct
#question.what do u mean by parasitic habit.give account of various parasitic adoptation in animal.
describe the biting mechanism of a poisonous snake
definition and explanation of fats
Radiology is a medical specialty that employs the use of imaging to both diagnose and treat disease visualised within the human body. Radiologists use an array of imaging technolog
Why should Posterior wall preffered during surgery Posterior wall should not be perforated during surgery. This limits bleeding from the pterygoid plexus or branches of the max
What is Glycolysis in Cell Metabolism? Glycolysis : is the process that breaks down glucose into pyruvate and energy. Glycolysis does not require the presence of oxygen and
Q. What does this fungus looks like? Ans. The important characteristic features of aflatoxicosis are jaundice, cirrhosis. Long term exposure to aflatoxins could lead to
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