Elements necessary for humans

At present there are 118 elements listed in the periodic table. Some of these elements are commonly found on the earth in the form of ores. Some are radioactive and have very short half lives. Many such elements have been synthesized in the laboratory and live for a very short time. Human body like other things existing is made of compounds which are made from the elements. Out of these 118 only some elements are connected with the human body. Although elements as such don’t make up the body it is the combined form that is molecules constitute the human… Read More »Elements necessary for humans

50 Years of IR8 :: The rice variety which saved the world

Rice is the staple food of millions in South East Asia. People in South India and North East grow rice as the main crop. It is eaten with fish. It is the rice, that ushered green revolution in India and brought India back from the jaws of starvation. Punjab became the leader in growing the rice, a crop which was alien to North india as most people liked wheat. It is another matter that Punjab has to pay a untold price for feeding the Indian population. Story of IR8 Rice A few days back, it was 50 years ago, the… Read More »50 Years of IR8 :: The rice variety which saved the world

Ammonia Clock

Ammonia is a chemical of great industrial importance as it is used in making the nitrogen based fertilizers. Its demand is so high that when Haber who developed the synthesis of ammonia by combining nitrogen and hydrogen using catalytic method, he was awarded Nobel prize. Here we will discuss its peculiar structure. Nitrogen is the central atom to which 3 hydrogen atoms are attached. But due to sp2 hybridized bonds it is not flat but trigonal prism. A pair of electrons resides on the nitrogen giving it basicity. The ammonia molecule readily undergoes nitrogen inversion at room temperature like an… Read More »Ammonia Clock