Tuesday, November 13, 2007

Blood Clot?

How does the blood clot?

Clotting is a natural phenomenon tht checks excessive loss of blood in case of injury. Clotting takes place whenever the tissue is injured. There are three types of cells in our blood - red blood cells, white blood cells and platelets. It is these platelets that help in forming clots to stop bleeding. The platelets gather at the site of the injured cell and prevent the red blood vessels from flowing out. They form a plug across the opening and release chemicals that convert liquid blood protein fibrinogen into insoluble fibrin. Fibrin forms a mesh of thread like fibres that trap platelets and other blood cells, thereby forming a clot.

Fringe Benefit Tax__

What is Fringe Benefit Tax?

Fringe Benefit Tax is a tax on benefits that the employee receive as a result of their employment, including those benefits provided through someone other than an employer.

Difference between ballistic missile and cruise missle?

What is the difference between ballistic missile and cruise missile?

A ballistic missile is a missile that follows a prescribed course that cannot be significantly altered after the missile has burned its fuel (i.e., its course is governed by the law of ballistics). In order to cover large distances, ballistic missiles are usually launched very high into the air or in space.

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A cruise missile is a guided missile which uses a lifting wing and most often a jet propulsion system to allow sustained flight. Cruise missiles are, in essence, unmanned aircraft. They are generally, designed to carry a large conventional or nuclear warhead many hundreds of miles with excellent accuracy. Modern cruise missiles normally travel at subsonic speed, are self-navigating and fly low in order to avoid radar detection.

Who was George Washington Carver?

Who was George Washington Carver?

George Washington Carver (1880-1943) was born into a slave house near Diamond Grove, Missouri (USA); he worked his way through Iowa State college, obtaining an M.A. in Agriculture in 1896. He was then invited by Booker T. Washing ton to become Director of Agricultural Research at Tiskegee Institute in Alabama. Hoping to improve the lives of disadvantaged black farmers and the economy of the Southern US, he promoted peanuts and sweet potatoes as alternatives to soil-depleting cotton and developed numerous products that could be made from each of these crops. He lectured widely on his work and was instrumental in the crop diversification that occurred in the Southern US in the early 20th century.