Khumalo N P, Doe P T, Dawber R P, Ferguson D J
Department of Dermatology, The Churchill Hospital, University of Oxford, United Kingdom.
J Am Acad Dermatol. 2000 Nov;43(5 Pt 1):814-20. doi: 10.1067/mjd.2000.107958.
The hair of normal black Africans forms a mat of tightly interwoven hair shafts. The effect of this on the structure of the hair shaft and the response to grooming is unknown.
Our purpose was to use light and scanning electron microscopy (SEM) to examine the structure of Negroid-type hairs and effects of combing in black African volunteers.
Hair samples were collected, by combing, from Africans and compared with those from Caucasian and Asian volunteers. The volunteers had never used chemical treatments. Their hair had not been cut for at least 1 year and grooming had been limited to shampooing, drying, and combing.
More than 2000 hairs in 12 African volunteers were examined by light microscopy. The hairs appear as a tight coiled springlike structure. Many shafts exhibited knots (10%-16% vs 0.15%) and appear broken compared with hair shafts from other ethnic groups. SEM of African hairs showed features consistent with repeated breaks of the shaft. Examination of hairs in situ showed interlocking of hair shafts.
These observations provide an understanding of the physical nature of, and effect of combing on, black African hair.
正常非洲黑人的头发形成紧密交织的毛干束。这对毛干结构以及梳理反应的影响尚不清楚。
我们的目的是使用光学显微镜和扫描电子显微镜（SEM）检查非洲黑人志愿者中尼格罗人种类型头发的结构以及梳理的影响。
通过梳理从非洲人身上收集头发样本，并与白种人和亚洲志愿者的头发样本进行比较。志愿者从未使用过化学处理。他们的头发至少1年未剪，且梳理仅限于洗发、吹干和梳理。
通过光学显微镜检查了12名非洲志愿者的2000多根头发。这些头发呈现出紧密盘绕的弹簧状结构。与其他种族的毛干相比，许多毛干出现结节（10% - 16% 对比0.15%）且看起来有破损。非洲人头发的扫描电子显微镜检查显示出与毛干反复断裂相符的特征。对原位头发的检查显示毛干相互交错。
这些观察结果有助于了解非洲黑人头发的物理性质以及梳理对其的影响。
