IS IRIDESCENCE A MATTER OF DIMENSION?

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 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，不是通过色素沉积产生的，而是通过高度组织的纳米级组织对光的相干散射产生的。所创建的颜色取决于组织的结构组件的大小和间距。我们假设这种大小和间距在非虹彩组织的所有三个维度上都是一致的，但在虹膜组织中只在一维或两维上是一致的。这种不同可以解释非彩虹色组织颜色的恒定性，但不能解释彩虹色组织的颜色稳定性。因此，我们建议使用断层摄影术来检查虹彩和非虹彩组织的三维组织。

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.