? asked in 社會與文化語言 · 10 years ago

請問化妝品英文期刊會翻譯的人幫忙解答

這是J.COSMET.SCI.,60,501-508(September/October 2009)的期刊

想請問會翻譯的人(禁網路線上翻譯)

我自己已有翻譯但不知正不正確想看看意思會不會差很多

這篇期刊還有後半段..這邊只不過是3分之ㄧ,如果你有時間可以和我分享整篇翻譯結果的希望你寄信給我或是留言給我

In most instances,sun exposure is the main stimulator of skin hyperpigmentation.A direct effect of UV photons results in activation of tyrosinase, the rate-limiting enzyme in melanin synthesis, as well as an increase in cell surface expression of receptors for at least one of the several known keratinocyte-derived melano genic factors,MSH(3).The inherent defense mechanism of skin against UV-B allows the transformation of tyrosine to 3,4-dihydroxyphenylalanine in the presence of UV-activated tyrosinase.This is further oxidized to DOPA quinine and then to dopachrome(4).Reduction of dopachrome yields 5,6-dihydroxyindole-2-carboxylic acid,which is ultimately converted via dihydroxyindole to the yellow-colored indole 5,6-quinone.Further, oxidative coupling of this results in the formation of eumelanin. Under normal circumstances eumelanins and pheomelanins are formed simultaneousil to lead to the so-called mixed-type melanins. This process requires three to six days before the tan is established(4).

There is a myriad of skin whiteners with variable efficacy(5)readily available for consumers. Modulation of melanogenesis in the melanocytes can be achieved using chemicals that share structural homologies with the substrate tyrosine and as thus competitively inhibit the catalytic function of tyrosinase(6). Kojic acid inhibits the catecholase activity of tyrosinase,which is the rate-limiting,essential enzyme in the biosynthesis of the skin pigment melanin. Hydroquinone, a hydroxyphenolic chemical,is a bleaching agent that has been used for decades as a skin-lightening agent(7). It acts by inhibiting the enzyme tyrosinase,thereby reducing the conversion of DOPA to melanin. Some of the other mechanisms of action are the destruction of melanocytes,degradation of melanosomes,and the inhibition of the synthesis of DNA and RNA(8).

Update:

Srrong skin lighteners like clobetasol and hydroquinone can cause complications and significant health problems,especially for individuals eith skin of clolr(9-11).Therefore,there is a constant need to investigate new and diverse potential shin lighteners that are safer and do not have side effects.

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  • 10 years ago
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    您好!

    在很多例子,太陽曝曬是一個很重要的刺激皮膚色素沈著,紫外光的直接效應導致酥氨基酸的活化作用....................

    好多,不會ㄌ~

    Source(s): 字典
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