Cheng J, Moss S C, Eisner M
Department of Physics, University of Houston, Texas 77204-5506.
Pigment Cell Res. 1994 Aug;7(4):263-73. doi: 10.1111/j.1600-0749.1994.tb00061.x.
Structural modeling of amorphous eumelanin has been carried out by comparing calculated data, S(q) and RDF(r), in reciprocal and real space, respectively, for limited random network models with the experimental X-ray scattering data of tyrosine melanin (Cheng et al., 1994). A basic picture of the atomic arrangements in amorphous eumelanin, which accounts for the short and intermediate range order, has been formulated. This reveals domains of a fundamental "particle" dimension of R approximately 15 A, consisting of a paracrystalline array of disordered planar networks polymerized by 4-8 DHI monomers with a graphite-like stacking spacing of approximately 3.45 A, 4-5 layers thick.
通过将有限随机网络模型在倒易空间和实空间中分别计算得到的数据S(q)和RDF(r)与酪氨酸黑色素的实验X射线散射数据（Cheng等人，1994年）进行比较，对无定形真黑素进行了结构建模。已构建出无定形真黑素中原子排列的基本图像，该图像解释了短程和中程有序。这揭示了基本“粒子”尺寸R约为15 Å的区域，该区域由由4 - 8个DHI单体聚合而成的无序平面网络的准晶阵列组成，具有近似3.45 Å的类石墨堆积间距，厚度为4 - 5层。
