It is a thin semipermeable membrane that surrounds cytoplasm. It also acts as cytoskeleton in many organisms. It is composed of proteins and lipids. Phopsholipids are major components of the cell membrane. The lipid bi layer is semi permeable. It is also called as plasma lemma or plasma membrane. It acts as a barrier between the cytoplasm and outer environment.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information.
Last date updated on September, 2014