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Vitamin A (Retinol)
Purified vitamin A is a viscous yellowish oil. It is freely soluble in most organic solvents such as methanol, ether, acetone, chloroform and petroleum ether as well as in fatty oils like olive, sesame and groundnut. However, Vitamin A is insoluble in water. It is highly susceptible to the action of atmospheric oxygen and oxygen carriers, further to oxidizing agents and metal ions. Vitamin A is also rapidly destroyed by UV light. Even in diffuse day light, the vitamin A conten of solutions is markedly reduced within a few hours. You must remember that vitamin A should be stored in a cool place, protected from light under vacuum or inert gas in air-tight containers or sealed ampules. You must understand that vitamin A itself is very unstable against external influences.
What are the major features of the meristematic cells? And why do these cells need to have a high mitotic rate? The Meristematic cells have very thin cell walls, a well-central
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Mounting boxes for insect collections Wood or cardboard cigar boxes make very useful and suitable housings for insect collections. After the insect has been separate from the s
WHAT IS THE FUNCTION OF CELL COAT
Assignment on molecular pharming
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Explain single pan balance and Electronic Digital Balance? Single Pan Balance: This is a very sensitive balance used for weighing quantities less than 10 grams. It accurately w
How did Darwin reach the principle of natural selection from the observation of differences among individuals of the same species? The Darwin recognized that in a same species
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