The epiglottis is prerequisite for the throat. Vocal cord is hold by larynx area. Human speech is produce and grows by the help of glottis. This is a present in base of the tongue and in smooth elastic tendon protect with mucous membrane. Epiglottis is leaf and guard shape at the entrance of the glottis. High-impact journals are those considered to be highly influential in their respective fields. 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