|Membranes are barriers which regulate the transformation of information between cells. Biological membranes are inert barriers which plays an important role in the life of the cell. These biological membranes are mainly selectively permeable in nature which does not allow the crossing of atoms with certain charge, shape, size and chemical properties of the atom. This nature is essential for the effective separation of the cell or cell organelles.
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. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.