Most people don't tan after just one day at the beach, or one session in the tanning bed, because it takes time to make melanin.
大多数人只在沙滩上玩一天或者使用晒黑床一段时间不会被晒成古铜色的皮肤，因为黑色素的合成是需要时间的。
A temporary increase in melanin the substance that colors hair eyes and skin is the culprit.
黑色素暂时的增加是罪魁祸首，这种物质让头发、眼睛和皮肤带上色彩。
As melanin encounters UV light, it turns brown.
黑色素遭遇到紫外光后变成褐色。
Arsenic has no synergistic effect with UV on melanin metabolism.
砷对紫外线的促黑素化作用没有协同效应。
Albinism: ABsence of the pigment melanin in the eyes, skin, hair, scales, or feathers.
白化病：指双眼、皮肤、毛发、鳞片、羽毛等缺乏黑色素的情况。
A temporary increase in melanin, the substance that colors hair eyes and skin, is the culprit.
黑色素暂时的增加是罪魁祸首，这种物质让头发、眼睛和皮肤带上色彩。
The type and amount of melanin your body produces determines the color of your skin, hair and eyes.
你的身体产生的黑色素类型及数量决定你皮肤，头发和眼睛的颜色。
Albinism, a group of inherited disorders, results in little or no production of the pigment melanin.
白化病是一组导致黑色素生成不足或无生成的遗传性疾病。
Individuals with lower levels of a melanin pigment called eumelanin are likely to have blonde hair.1.
黑色素水平较低的个体(eumelanin)很可能拥有金发。
In people with brown, black and blond hair, the gene, for the melanocortin-1 receptor, produces melanin.
在褐色头发、黑头发和金发的人群中，黑素皮质素受体基因(melanocortin - 1receptor)能分泌黑色素。
Instantly moisturize skin, fade melanin, and make skin refreshing, soft and clear with high luster.
瞬间润透肌肤，立感清新柔软，淡化色素沉着，令肌肤闪现匀净光泽。
People with freckles have a normal number of melanocytes; their melanocytes just create clusters of melanin.
有雀斑的人呢，他们的黑色素细胞数量是正常的，只是他们的黑色素细胞产生了一些黑素。
In response to the UV rays frying your inner layer of skin, your body produces more melanin pigment that darkens the skin.
作为对紫外线灼伤内皮层的反应，你的身体会产生更多的黑色素使皮肤颜色变深。
Infant and toddler skin also has less of the brown pigment melanin, which helps protect the skin from ultraviolet light.
婴幼儿皮肤含黑色素较少，而黑色素能够保护皮肤不受紫外线伤害。
Overall skin coloration is determined by the degree to which cells in the skin called melanocytes produce the pigment melanin.
总的来说，皮肤的颜色是由皮肤中一种叫做黑色素细胞产生黑色素多少而定的。
Her team's research suggests that the birds may have evolved to produce higher levels of melanin in order to protect their immune systems.
她的小组研究表明鸟类可能经进化产生较高水平的黑色素，以保护其免疫系统。
A study of urban pigeons in central Paris has shown that birds with higher levels of the dark pigment melanin have stronger immune systems.
一个对巴黎市中心的城市鸽子的研究显示，黑色素水平较高的鸽子有更强的免疫系统。
There is an autoimmune condition called vitiligo in which melanocytes are attacked by the immune system and become too weak to produce melanin.
这种情况就是说黑色素细胞因遭到免疫系统攻击而变得虚弱，从而无法产生黑素。
One of Purkinje's many observations was that dopaminergic midbrain neurons (which we now know degenerate in Parkinson's Disease) synthesize melanin.
在浦肯野的众多发现中，其中一个是多巴胺能中脑神经元(现在我们知道，在帕金森氏病中，此种神经元退化)能够合成黑色素。
Skin color is due to melanin, a pigment produced in the epidermis to protect us from the sun's potentially cancer-causing ultraviolet (UV) rays.
皮肤的颜色取决于黑色素。黑色素是由表皮生成的一种色素，防止我们受到太阳光中致癌的紫外线的伤害。
These light receptors - which are also found in the retina of the eye - immediately prompt the release of melanin, the body's own form of sun protection.
在视网膜中也能发现这些感光物质。它们能迅速刺激皮肤黑色素的生成，保护人体不受太阳光线的伤害。
Results revealed that the light receptors, called rhodopsin, became most active under blue and UV light, prompting melanin production within seconds.
结果显示，光受体，称为视紫红质，在蓝和紫外光下最活跃，促使黑色素在几秒内产生。
The laser energy removes the brown pigment, or melanin, from the top layer of the iris, and the blue eye colour emerges over the following two to three weeks.
激光能去除眼球虹膜最外层的棕色素或黑色素，而蓝眼珠会在两到三周之后显现。
The scientists found that a peptide active in the hypothalamus called melanin-concentrating hormone or MCH can inactivate the reproductive system in times of hunger.
科学家发现，下丘脑中有一种肽类物质叫做“黑色素聚集激素”或者“MCH”，在饥饿时期可以使生殖系统失去活性。
Coloring the skin may sound simple, but nature requires at least 25 different genes to synthesize, package and distribute the melanin pigment that darkens the skin and hair.
给皮肤上色看起来很简单，但大自然却至少需要25种不同的基因来合成、包装及输送黑色素到人体各处以使皮肤和头发呈现不同颜色。
On areas of the skin that have years of frequent and prolonged sun exposure, age spots appear when melanin becomes "clumped" or is produced in particularly high concentrations.
而对于长时间频繁遭受太阳暴晒的皮肤，黑色素便会“集群分布”或产生过多，此时就显示出老人斑。
Bird feathers and reptile scales contain melanosomes-tiny sacs holding varieties of the pigment melanin. Many paleontologists suspected that dinosaur feathers also contained melanosomes.
因为鸟类羽毛和爬行动物的鳞片都包含黑素体——这是一种微小的囊状结构，其中包含了各种各样的黑色素，于是很多古生物学家开始怀疑恐龙羽毛是否也含有黑素体。
Bird feathers and reptile scales contain melanosomes-tiny sacs holding varieties of the pigment melanin. Many paleontologists suspected that dinosaur feathers also contained melanosomes.
因为鸟类羽毛和爬行动物的鳞片都包含黑素体——这是一种微小的囊状结构，其中包含了各种各样的黑色素，于是很多古生物学家开始怀疑恐龙羽毛是否也含有黑素体。
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