黑色素主要由两种醌型聚合物:真黑色素(Eumelanins)和类黑色素(Pheomelanins or Melanoid)组成。含铜的酪氨酸酶催化酪氨酸转化为多巴醌,这一步是黑色素开始形成的最关键的一步。
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人类黑色素瘤相关抗原 melanoma-associated antigen
产黑色素类杆菌 black-pigmented bacteria ; BPB ; Bacteroides melaninogenicum
黑色素类杆菌 black-pigmented bacteria ; BPB
2008年举行活动这天确诊的病例中,3000多例为基底细胞癌(非黑色素瘤类),354例为恶性黑色素瘤,这是最致命的皮肤癌类型。
Of the cases identified on the campaign day in 2008, more than 3000 were basal cell carcinomas (non-melanomas) and 354 were malignant melanomas, the most deadly type of skin cancer.
黑色素瘤开始时呈现色素痣或雀斑的外观,但颜色、大小和形状上有区别,是皮肤肿瘤中最危险的一类。
Melanomas appear as a mole or freckle that changes colour, size or shape, but are the most dangerous type of skin cancer.
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。
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.
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