It can be defined as a place of numerous related genes which is created by doubling a single novel gene with same biochemical functions. Genes are categorized into families on the basis of mutual nucleotide or protein sequences. If a gene of a gene family instructs proteins, the word protein family is frequently used in a similar manner to gene family.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