Alopecia areata is a type of hair loss that occurs when the immune system mistakenly attacks hair follicles, place where the hair growth begins. The damage to the follicle is usually not permanent. But the cause of the immune system attacks the follicles is unknown. Alopecia areata is most common in people younger than 20, but children and adults of any age may be affected. Women and men are affected equally. Alopecia areata usually begins when clumps of hair fall out, resulting in totally smooth, round hairless patches on the scalp. In some cases the hair may become thinner without noticeable patches of baldness, or it may grow and break off, leaving short stubs. In some rare cases, complete loss of scalp hair and body hair occurs. The hair loss often comes and goes but, hair will grow back over several months in one area but will fall out in another area. When alopecia areata results in patches of hair loss, the hair usually grows back in a few months. Although the new hair is usually the same color and texture as the rest of the hair, it sometimes is fine and white. About 10% of people with this condition may never regrow hair.
Scientific journal is a periodical publication intended to further progress of science, usually by reporting novel research. There are thousands of scientific journals in publication, and many more have been published at various points in the past. Most journals are highly specialized, although some of the oldest journals publish articles and scientific papers across a wide range of scientific fields. Scientific journals contain articles that are peer reviewed, to ensure that articles meet the journal's standards of quality, and scientific validity. The publication of the results of research is an essential part of the scientific method. If they are describing experiments or calculations, they must supply enough details that an independent researcher could repeat the experiment or calculation to verify the results. Each such journal article becomes part of the permanent scientific record.
Last date updated on June, 2014