Melanin is a polymer which is derived tyrosine. Melanin is responsible for determining the colour of skin and hair. The presence of melanin in the skin depend on content it has been exposed to the sun. Eumelanin, Pheomelanin and Neuromelanin are the different types of melanin. Neuromelanin is usually found in brain and loss of this melanin leads to several neurological disorders.
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 June, 2014