Invasion is defined as the forcible occupation of the premises without prior intimation. It affects the natural working environment. It is a direct form of cancer spreading to space surrounding nerves. It is concerned with head, neck, prostate gland and colorectal organ. Prediction of disease is very difficult. It can be treated surgically and by using radiotherapy management. 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.
Last date updated on September, 2014