Causes of brown or black spots in brass barrel plating of small hardware were analyzed and some counter measures were put forward.

　分析了小五金產(chǎn)品滾鍍黃銅層易產(chǎn)生棕黑斑點(diǎn)的原因,論述了黃銅層出現(xiàn)棕黑斑點(diǎn)是零件基材腐蝕的開(kāi)始。

Mammalian coat color is induced by switching between eumelanin and phaeomelanin, which are produced by melanocytes in hair follicles.

哺乳動(dòng)物毛色的形成是由毛囊黑色素細(xì)胞產(chǎn)生的真黑素和棕黑素之間的轉(zhuǎn)換而引起的 ,控制哺乳動(dòng)物毛色的基因位點(diǎn)很多 ,且以錯(cuò)綜復(fù)雜的方式互相作用。

Preliminary Observations on Ecology of Elaphe schrenckii(Strauch);

棕黑錦蛇Elaphe schrenckii(Strauch)生態(tài)初步觀察

The optimum extraction conditions and production rate of Cinnmonum camphora dark red pigment were established with orthogonal test L_9(3~4)and Duncan method.

利用正交試驗(yàn)設(shè)計(jì)和Duncan法檢驗(yàn),確立了樟樹(shù)葉棕黑色色素的最佳提取條件及其提取率。

The dark red pigment isolated from dry leaves of Cinnamomum camphora has high stability in the solutions with pH 4.

從樟樹(shù)落葉中提取得到的棕黑色色素在ｐＨ４。