21.03.2015
Dans tous les cas, le bronzage rapide est A  exclure d'office (quelle que soit la solution de bronzage). Il est important de respecter les conseils d'utilisation et de prendre connaissance de son type de peau avant toute utilisation. Les rayons IR arrivent jusque sur la terre pratiquement sans obstacles, Ce sont eux qui nous procurent la chaleur. Une protection est nécessaire - l'UV endommage la peau et peut causer des coups de soleil. Le photorajeunissement a la Lampe Flash (IPL) peut rajeunir la texture de votre peau et attenuer les taches et les rougeurs.
La lampe flash, appelee aussi IPL (intense pulse light) ou Lumiere Polychromatique Pulsee permet le traitement de la peau par application d’une lumiere intense pulsee a l’aide d’un appareil proche des lasers. Il est indique pour le rajeunissement de la peau, le traitement des taches brunes solaires (visage, decollete, dos des mains) et pour les rougeurs (couperose, erythrose).
Utilise dans des conditions adequates, l’IPL est tres bien supporte, non douloureux et les effets indesirables sont minimes (sensation d’echauffement, rougeurs discretes, rares depigmentations ou pigmentations transitoires). Il faut noter que le reglage des IPL est delicat et que l’effet est fortement accentue par le bronzage des patients ou l’exposition aux UV en cabine. Les traitements par la lumiere pulsee sont strictement reserves a l’usage medical, en raison du risque de brulure. Les photos sont montrees pour donner un apercu des resultats escomptes apres traitement, les resultats peuvent varier d’une personne a l’autre. Although melanins are ubiquitous in humankind, our understanding of their chemistry is surprisingly limited. Melanins seem to be heterogeneous, with some small regions of order at the nanometer scale. There are different types of melanin, and the ratio of these pigments produces different hair colors, again genetically determined.
Although people with dark hair may still produce the yellow-orange pheomelanin, it is largely masked by the dark eumelanin pigment and cannot easily be seen.
Melanin reduces ultraviolet induced DNA damage by absorbing or scattering the ultraviolet radiation that otherwise would have been absorbed by the DNA. Skin color depends upon the size, number, shape, and distribution of melanosomes, as well as the chemical nature (level of activity) of their melanin content. There is a striking correlation between geographic conditions, particularly exposure to sunlight, and skin tone. Early humankind living in the sun-soaked savannah plains of Africa developed a dark-toned skin, rich in the pigment melanin.
There are other benefits to having a high concentration of melanin in the skin and other parts of the body. It seems that, as early peoples migrated away from the equator into areas less exposed to the sun, there was not enough UV radiation to produce sufficient vitamin D to prevent diseases such as rickets.
Light-skinned people visiting sunny locations may not have enough melanin to block the sun sufficiently, and may burn their skin without the protection of sunblock.
As the distribution map of skin color shows, skin color variation is not deter mined purely by distance from the equator. The popularity of tanning seems cyclical, alternately being perceived as a healthy vibrant look and as a worrying reminder of the dangers of sunburn and carcinogenic melanomas.
Skin is alive, so when melanin is destroyed by UV ra diation, the skin responds to this damage. Melanogenesis is the name of the process where melanins are produced by specialized pigment cells called melanocytes, in response to UV radiation. Regular tanning beds use several fluorescent lamps (see light bulbs and lamps) that have phosphor blends designed to emit UV in a spectrum that is somewhat similar to the sun.
A tanning bed or sun bed (whether at home or in a salon) is a device emitting ultraviolet radiation used to produce a cosmetic tan.
The World Health Organization (WHO) does not recommend the use of UV tanning devices for cosmetic reasons.
Lotions that contain dihydroxyacetone (DHA) as the active ingredient are used in many sunless tanning products.
Another sunless tanning product is a tanning pill that contains canthaxanthin, most commonly used as a color additive in certain foods (see plants and other organic molecules). While some light skinned people tan or use cosmetic means to darken their skin, dark-skinned people may use cosmetic means to lighten their skin. The term skin whitening covers a variety of cosmetic methods used to lighten the skin’s color. As camaras de bronzeamento artificial ainda atraem cerca de 30% das jovens americanas brancas, pelo menos uma vez por ano.
Apesar de estarem entre as grandes causadoras de cancer de pele, as camaras de bronzeamento artificial continuam a atrair cerca de 30% das meninas de pele clara nos EUA, pelo menos uma vez por ano, informa o Centro para Controle e Prevencao de Doenca (CDC, na sigla em ingles). O Brasil e Nova Gales do Sul, na Australia, ja proibiram o uso de camaras de bronzeamento e Reino Unido, Alemanha, Escocia e Franca proibiram o metodo artificial para menores de 18 anos.


La peau du visage mettra d'autant plus de temps A  bronzer qu'elle est claire A  l'origine. Son but est d'obtenir un hA?le temporaire similaire A  celui obtenu par un bronzage (naturel ou artificiel). Si on reste dehors pendant plus d'une heure, on n'oublie pas de se couvrir et de mettre un écran solaire.
Cependant, l'indice UV peut atteindre 14 ou plus sous les tropiques ou dans le sud des Etats-Unis.
Votre peau se tache petit a petit, des rougeurs apparaissent, le grain de peau est moins net et de petites rides apparaissent sur votre visage, votre decollete et vos mains. Il permet d’ameliorer la texture de la peau et le relachement, resserre les pores, diminue des taches, les rougeurs et les rides superficielles.
Les resultats obtenus sont durables plusieurs annees et necessitent des seances d’entretien de temps en temps, 1 a 2 fois par an. Des cas de brulures superficielles ont ete regulierement rapportes dans les etudes medicales, secondaires a un reglage trop puissant de l’appareil ou a la presence de bronzage. Les 12 tubes UV vous garantissent de cibler parfaitement la zone A  bronzer avec un confort maximal (sans avoir A  vous tordre le cou).
The optical properties we can see depend on the ability of monomers and oligomers (made up of small numbers of monomers) that make up melanin to absorb light, and the ability of melanin particles to reflect and scatter incident light for different wavelengths. Variation in the color of our eyes from brown to green depends on the amount of melanin in the iris, which in turn is determined genetically. The actual appearance of hair, and its overall reflective quality, is determined primarily by the pigment type, but also by the density and distribution of the pigment granules. However, the red-yellow pheomelanin is believed to cause the warm, golden, or auburn tones found in some types of brown hair.
Adjacent patches of hair follicles may show a very precise split between the two pigment types. This prevents the development of melanoma, a potentially deadly form of skin cancer, as well as other health problems related to exposure to strong solar radiation. These differences have evolved to find the balance between the benefits and the dangers of the ultraviolet (UV) radiation we absorb from the sun. Within the skin cells, melanin concentrates above the nucleus, shielding the vital DNA from radiation damage.
Melanin boosts the immune system, and darker-skinned groups have been shown to have a lower incidence of a number of serious diseases, including Parkinson’s, multiple sclerosis, and spina bifida. This vitamin helps promote bone growth, maintaining the right balance between calcium and phosphorus in the body.
Their bodies compensated by producing less melanin, so that more sunlight would be allowed through.
Dark-skinned people visiting areas where there is less exposure to the sun may apparently not produce enough vitamin D, but can get it from supplements or food sources. Sunshine is the primary source of UV radiation, but artificial sources such as tanning beds produce similar effects. Skin cells will produce more melanin, replacing what has been lost and increasing the percentage of melanin in the skin. The radiation produced is primarily UVA, with some UVB always being emitted, but the combinations of UVA and UVB can vary. Overexposure to UV radiation from the sun and artificial sources is of considerable concern for its adverse effects on health. DHA, which is derived from plant sources like sugar beets and sugar cane, is a colorless sugar that interacts with the dead cells located in the stratum corneum of the epidermis. While the FDA has approved the use of canthaxanthin in food, it does not approve its use as a tanning agent. The producers claim that the tyrosine stimulates and increases melanin formation, thereby accelerating the natural tanning process.
These powders and moisturizers, once applied, create a tan that can easily be removed with soap and water.
This is an even more controversial process than tanning, as the desire for whiter skin is intertwined with issues of health, self-image, racial inequalities and colonial attitudes. Most skin-lightening treatments are aimed at inhibiting tyrosinase, to reduce or halt the production of melanin.
Segundo o levantamento, as garotas ainda cursam o ensino medio e 17% delas disseram que foram pelo menos dez vezes por ano a espacos que oferecem o tratamento estetico. A revisao de dados em todo o mundo (que compreendem 19 estudos internacionais) feita pelo Grupo de Trabalho da Agencia Internacional para Pesquisa sobre Cancer (um membro da Organizacao Mundial da Saude) constatou que em todas as faixas etarias, homens e mulheres que ja usaram camaras de bronzeamento correm um risco 15% maior de desenvolver melanoma (um dos tipos de cancer de pele).Alem disso, as pessoas que usam camaras de bronzeamento antes dos 35 anos tem ate 75% de probabilidade de desenvolver o melanoma. En effet leur surface d'action, du fait de la taille de l'appareil, est beaucoup plus grande. Bougez sous le soleil : vous bronzez plus vite > Adoptez le tapis de plage > Utilisez un maillot transbronzant > Mettez en valeur votre bronzage avec un maillot blanc ! Il provoque un effet de remodelage par augmentation de la synthese de collagene dans le derme. Il peut aussi ameliorer les cicatrices.


There are at least three types of naturally occurring melanins: eumelanin, pheomelanin and neuromelanin. Once separated from living tissue, they form an amorphous mass and lose their inherent structure, making them very difficult to analyze.
Melanins seem to have some semiconductor properties, and none of the proposed band models adequately account for this. The range of colors produced by melanins is limited to shades of yellow, brown, red, and black.
This effect is most obvious in the patterns and markings of other mammals, such as leopards, tigers, and certain breeds of dog. The amount of UV radiation that is absorbed or scattered is determined by a number of factors: the size, shape, and distribution of melanosomes, as well as the wavelength of the incident ray.
In an environment where there is little to break the path of sunlight onto the skin, this barrier is a great advantage.
Darker-skinned individuals also age better, as their skin is better protected from sun damage. This may be because they are exposed to high levels of reflected UV radiation from the snow, or because their diet with its high proportion of fish is rich in vitamin D.
This melanin has two effects, acting as a barrier to protect the skin from further damage, and darkening the natural color of the skin.
Tanning bulbs are long fluorescent tubes, and fall into two main categories: low pressure lamps and high-pressure bulbs.
UV radiation plays an important role in the development of skin cancer, cataracts, (see colorblindness), and other eye conditions. One of the original sunless tanning lotions caused streaking and an orange skin tone, which gave the fake tan a bad reputation.
However, more scientific data is needed to determine the validity of these claims and to assess the safety of using large amounts of tyrosine.
Exfoliants such as topical cosmetics or chemical peels may be used, or the skin may be treated with lasers, depending on the response of the individual’s skin to treatment.
Pesquisadores do CDC publicaram os resultados de uma pesquisa on-line no periodico JAMA Internal Medicine. En effet, l'action n'est pas permanente puis que le DHA n'agit que sur les cellules mortes de notre peau.
En choisissant une lampe de bronzage A  domicile, vous A?tes responsable de votre programme de bronzage.
Both the chemical composition and the physical properties differ for the various types of melanin, suggesting that their chemical and biological responses may behave differently when exposed to light.
Individuals with black or brown eyes have eyes with more melanin to block the sun’s rays. Low levels of pheomelanin (in the absence of eulamelanin) are characteristic of cream-colored hair in many animals.
A tan effect is also created when existing melanin is oxidized, but this doesn’t last as long. As with some tanning products, there is some evidence suggesting that there are harmful side effects to skin-lightening products. As estatisticas foram obtidas como parte do Youth Risk Behavior Survey 2011 e da pesquisa National Health Interview Survey 2010. Those with blue, green, or hazel eyes have little protection from the sun and may experience discomfort, irritation, burning, and tissue damage if the eyes are not protected by sunglasses when exposed to bright light. A small amount of brown eumelanin in the absence of other pigments apparently causes blond hair. White hairs contain no melanin at all: their whiteness is an optical effect, due to the way they reflect the light.
Upon taking the tanning pill, canthaxanthin is deposited all over your body, including in your skin, which turns an orange-brown color. Pheomelanin is a lighter pigment found in red hair, and is concentrated in the redder areas of the skin such as the lips.
The number of bulbs used by tanning beds vary: those designed for the home use 20 to 30 bulbs, commercial beds use 30 to 40 bulbs, and specialist stand-up booths use as many as 60 bulbs. Various side effects, including canthaxanthin retinopathy, a condition in which yellow deposits form in the retina of the eye, have been identified.
Because people with red hair are less able to make the dark eumelanin pigment, their skin is generally quite pale and burns easily with sun exposure.



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