Testosterone is a steroid hormone secreted in large amounts by the testicles of males and the ovaries of females. Adrenal glands also secrete testosterone in small amounts. It is the major male sex hormone which plays a key role in the development of testis and prostate organs. Secondary sexual characteristics such as increased muscle, bone mass, and body hair growth are promoted through the release of testosterone. It is also essential in the prevention of osteoporosis.The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number ofÂ citationsÂ to recent articles published inÂ science and social science journals in a particular year or period, and is frequently used as aÂ proxyÂ for the relative importance of a journal within its field. It is first devised byÂ Eugene Garfield, the founder of theÂ 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