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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.
Biology once said why this statement is logical in terms of kin selection and use the coefficient of relatedness he'd be willing to lay down his life to save two brothers or eight
Hypothetical Age Pyramids The three types of hypothetical age pyramids which are as follows: 1) A pyramid with a broad base, indicating a high percentage of young individua
Braxy The causative agent of braxy is Cl. septicum. It usually affects lambs. The agent is a normal inhabitant of soil and is frequently found in the faeces of herbivores. Bra
Q. Illustrate Thallium Scintigraphy? It is often done with SPECT (single photon emission computed tomography) which further increases the sensitivity. However, a stress test w
what type of body cavities present
Classification of the Phylum Protozoa up to orders
Cytokinesis It is defined as the division or cleavage of cytoplasmic part of the cells into two daughter cells. It is first indicated during late anaphase by app
Define Eosin - Methylene Blue (EMB) Agar (Levine) Peptone - 10.0 gm Lactose - 5.0 gm Dipotassium - 2.0 gm Hydrogen Phosphate Agar - 13.5 gm Eosin Y - 0.4 gm M
Explain Delavirdine Delavirdine (DLV, Rescriptor) - Delavirdine is the least potent NNRTI. A study comparing delavirdine/zidovudine/didanosine, delavirdine plus either zidovud
Q. What is Atomic constipation? This type is most common; often it is called the "lazy .bowel". There is a loss of muscle tone causing weak peristalsis, the causes are: a) L
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