- published: 12 Jun 2013
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Protoplasm is the living contents of a cell that is surrounded by a plasma membrane. It is a general term of the Cytoplasm . Protoplasm is composed of a mixture of small molecules such as ions, amino acids, monosaccharides and water, and macromolecules such as nucleic acids, proteins, lipids and polysaccharides. In eukaryotes the protoplasm surrounding the cell nucleus is known as the cytoplasm and that inside the nucleus as the nucleoplasm. In prokaryotes the material inside the plasma membrane is the bacterial cytoplasm, while in Gram-negative bacteria the region outside the plasma membrane but inside the outer membrane is the periplasm.
The word 'protoplasm' comes from the Greek protos for first, and plasma for thing formed. It was first used in 1846 by Hugo von Mohl to describe the "tough, slimy, granular, semi-fluid" substance within plant cells, to distinguish this from the cell wall, cell nucleus and the cell sap within the vacuole.Thomas Huxley later referred to it as the "physical basis of life" and considered that the property of life resulted from the distribution of molecules within this substance. Its composition, however, was mysterious and there was much controversy over what sort of substance it was. Attempts to investigate the origin of life through the creation of synthetic "protoplasm" in the laboratory were not successful, yet.
Scott Philip Brown (born September 12, 1959) is an American politician and the junior United States Senator from Massachusetts. Brown previously served as a member of the Massachusetts General Court, first in the State House of Representatives (1998–2004) and then in the State Senate (2004–2010).
Brown is a member of the Republican Party, and faced the Democratic candidate, Massachusetts Attorney General Martha Coakley, in the 2010 special election to succeed U.S. Senator Ted Kennedy for the remainder of the term ending January 3, 2013. While initially trailing Coakley in polling by a large margin, Brown won the election and in January 2010 became the first Republican elected to the U.S. Senate from Massachusetts since Edward Brooke in 1972.
Prior to entering the state legislature, he had experience as a town selectman and assessor. He is a practicing attorney, concentrating in real estate law and serving as defense counsel in the Judge Advocate General's Corps of the Massachusetts Army National Guard. Brown is a graduate of Wakefield High School (1977), Tufts University (1981), and Boston College Law School (1985).
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