IS IRIDESCENCE A MATTER OF DIMENSION?

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 羽毛中的许多颜色，包括彩虹色（即随着反射/观察角度改变颜色）和非彩虹色，都不是通过色素沉积而是通过高度组织化的纳米级组织对光的相干散射产生的。 所产生的颜色取决于组织的结构成分的大小和间距。我们假设，这种大小和间距是一致的所有三个维度上的非虹彩组织，但只有在一个或两个维度的虹彩组织。这种差异可以解释非虹彩组织而非虹彩组织颜色的恒定性。因此，我们建议使用断层扫描检查的三维组织的虹彩和非虹彩组织。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Many colors in feathers, both iridescent (i.e. changing color with angle of reflectance/viewing) and non-iridescent, are created not through pigment deposition but through coherent scattering of light by highly organized nanoscaled tissues. The created color depends on the size and spacing of structural components of the tissue. We hypothesize that this size and spacing is consistent on all three dimensions in non-iridescent tissues, but only in one or two dimensions in iridescent tissues. This difference would explain the constancy of color from non-iridescent, but not iridescent, tissues. We thus propose to use tomography to examine the the three dimensional organization of iridescent and non-iridescent tissues.