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Spray-on hair. Spray-on hair or hair in a can is a hairstyling product consisting of an aerosol spray applied to balding areas of the scalp to create artificial hair covering that area. Spray-on hair generally works in one of two ways. Either it directly colors the scalp and enhances whatever hair is in the area by thickening it, or it ...
Shaving was the primary form of hair removal until reports in 1983 showed that it may lead to an increased risk of infection. [33] Clippers are now the recommended pre-surgical hair removal method. [34] [35] A 2021 systematic review brought together evidence on different techniques for hair removal before surgery. This involved 25 studies with ...
The step response of a system in a given initial state consists of the time evolution of its outputs when its control inputs are Heaviside step functions. In electronic engineering and control theory, step response is the time behaviour of the outputs of a general system when its inputs change from zero to one in a very short time.
Metriini. Bombardier beetles are ground beetles (Carabidae) in the tribes Brachinini, Paussini, Ozaenini, or Metriini—more than 500 species altogether—which are most notable for the defense mechanism that gives them their name: when disturbed, they eject a hot noxious chemical spray from the tip of the abdomen with a popping sound.
Laser hair removal. Laser hair removal is the process of hair removal by means of exposure to pulses of laser light that destroy the hair follicle. It had been performed experimentally for about twenty years before becoming commercially available in 1995–1996. [ 1] One of the first published articles describing laser hair removal was authored ...
Chemical depilatory. A chemical depilatory is a cosmetic preparation used to remove hair from the skin. Common active ingredients are salts of thioglycolic acid and thiolactic acids. These compounds break the disulfide bonds in keratin and also hydrolyze the hair so that it is easily removed. Formerly, sulfides such as strontium sulfide were ...
An insect 's respiratory system is the system with which it introduces respiratory gases to its interior and performs gas exchange . Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system ...
Insects have had millions of years to evolve mechanical defenses. Perhaps the most obvious is the cuticle. Although its main role lies in support and muscle attachment, when extensively hardened by the cross-linking of proteins and chitin, or sclerotized, the cuticle acts as a first line of defense. [ 5]
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