|These are a type of cells which help in destroying the cellular debris, microbes, foreign substances that are present in the body by a process called phagocytosis. They play a very important role in non-specific defense of the human body as well as help in innate immunity of the body by sending signals to activate other cells such as the lymphocytes. Macrophages also play an important anti-inflammatory role.
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.