Growth of hair during pregnacy
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Hair is an outgrowth of the epidermis in mammals. Hair is a characteristic of all mammals, though in some species hair is absent at certain stages of life.
The speed of growth is roughly 10 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.
Hair is a biological polymer; over 90% of its dry weight is made up of proteins called keratins. Under normal conditions, human hair contains around 10% water, which modifies its mechanical properties considerably. Hair proteins are held together by disulfide bonds, from the amino acid cysteine. These links are very robust; for example, virtually intact hair has been recovered from ancient Egyptian tombs. Different parts of the hair have different cysteine levels, leading to harder or softer material.
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- Hair Growth Solutions
Company offers safe solutions for stopping hair loss and creating new hair growth. - Unbalding: Hair Today, More Tomorrow?
by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery. - California Pacific Research, Inc.
New Generation hair care systems to promote healthy hair growth without drugs and potential side effects. - ThymusKing
Offering ThymuSkin products for stimulating the growth of new hair. Includes information on hair loss and directions for use. - Physicians Hair Growth
Hair loss treatment center that supplies ReMox, a combination of minoxidil and tretinoin.