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Ascorbic Acid (vitamin C)
Although the antiscorbptic (preventing the disease scurvy) effects of citrus hits was known for a long time, the first important step towards its isolation was the discovery of Holst and Frolich in 1907. They reported that guinea pigs, like man and monkey, were also susceptible to scurvy. The isolation of vitamin C was carried out by Zilva during 1917-1927.
The Asteroid Belt-Rubble of the Solar System: There is a gap of 547 million kilometers, between the orbits of Mars and Jupiter. In this gap are thousands of bodies made of ro
Role of Communication in the Economic Development: This is as much as one-sixth of the world's population. In the year 1981,446 million Indians were illiterate, i.e., they co
what is threshing??
An experiment with a floating candle Put a nail in the lower end of a candle. The nail should be just the right weight to make the candle float with its top a little above the
Explain Mouth To Mouth Respiration If no instrument is available, one's own lung may be used as a positive pressure pump. Air may be blown into the lungs of the subject by way
Question 1 Analyse the present state of environment system by performing Economic analysis Question 2 Discuss the reasons for the market failure in Environmental Eco
A field trip to a rock quarry The quarry should be visited by the teacher in advance. View how the rock is removed. If the rock is sedimentary, view the layers. Collect rock sa
how to make working model of induction
Making a precision reflecting telescope It is fairly beyond the scope of this book to include the intricate details for mirror grinding and testing. Though, some teachers may w
Personal sensitivity : There are other dangers from substances which are not so common. e.g. mutagens , but one aspect we have not mentioned involves you. The eyes, lungs and skin
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