Paramecium
Paramecium tetraureliaParamecium aureliaParamecium caudatum
The Paramecium is a group of unicellular ciliate protozoa formerly known as slipper animalcules from their slipper shape. They are commonly studied as a representative of the ciliate group. Paramecia range from about 50 to 350 μm in length, depending on species. Simple cilia cover the body which allow the cell to move with a synchronous motion. There is also a deep oral groove containing inconspicuous compound oral cilia (as found in other peniculids) that is used to draw food inside. They generally feed upon bacteria and other small cells. Osmoregulation is carried out by a pair of contractile vacuoles, which actively expel water absorbed by osmosis from their surroundings.
Paramecia are widespread in freshwater environments, and are especially common in scums. Paramecia are attracted by acidic conditions. Certain single-celled eukaryotes, such as Paramecium, are examples for exceptions to the universality of the genetic code (translation systems where a few codons differ from the standard ones).
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Wednesday, May 23, 2007
Benjamin Franklin
Benjamin Franklin
Benjamin Franklin (January 17 [O.S. January 6] 1706 – April 17, 1790) was one of the best-known Founding Fathers of the United States. He was a leading author, politician, printer, scientist, philosopher, publisher, inventor, civic activist, and diplomat. He founded the United States' earliest libraries, including The Library Company of Philadelphia and those found at the University of Pennsylvania, Harvard University, Brown University, Dartmouth College, and many others. As a scientist he was a major figure in the history of physics for his discoveries and theories regarding electricity. As a political writer and activist he, more than anyone, invented the idea of an American nation,[1] and as a diplomat during the American Revolution, he secured the French alliance that helped to make independence possible.Franklin was noted for his curiosity, his writings (popular, political and scientific), and his diversity of interests. As a leader of the Enlightenment, he gained the recognition of scientists and intellectuals across Europe. An agent in Lond on before the Revolution, and Minister to France during it, he more than anyone defined the new nation in the minds of Europe. His success in securing French military and financial aid was a great contributor to the American victory over Britain. He invented the lightning rod; he was an early proponent of colonial unity; historians hail him as the "First American."
credit : http://en.wikipedia.org/wiki/Main_Page
Benjamin Franklin (January 17 [O.S. January 6] 1706 – April 17, 1790) was one of the best-known Founding Fathers of the United States. He was a leading author, politician, printer, scientist, philosopher, publisher, inventor, civic activist, and diplomat. He founded the United States' earliest libraries, including The Library Company of Philadelphia and those found at the University of Pennsylvania, Harvard University, Brown University, Dartmouth College, and many others. As a scientist he was a major figure in the history of physics for his discoveries and theories regarding electricity. As a political writer and activist he, more than anyone, invented the idea of an American nation,[1] and as a diplomat during the American Revolution, he secured the French alliance that helped to make independence possible.Franklin was noted for his curiosity, his writings (popular, political and scientific), and his diversity of interests. As a leader of the Enlightenment, he gained the recognition of scientists and intellectuals across Europe. An agent in Lond on before the Revolution, and Minister to France during it, he more than anyone defined the new nation in the minds of Europe. His success in securing French military and financial aid was a great contributor to the American victory over Britain. He invented the lightning rod; he was an early proponent of colonial unity; historians hail him as the "First American."
credit : http://en.wikipedia.org/wiki/Main_Page
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