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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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    此摘要是机器生成的。

    本研究介绍了一种创建具有结构颜色的3D动态moiré图像的新方法,通过组合微镜头数组 (MLA) 和微图案数组 (MPA). 这种技术增强了虹彩,并为防伪等应用程序提供了运动效果.

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 材料科学 材料科学 材料科学
    • 纳米技术纳米技术

    背景情况:

    • 结构色彩提供了充满活力的,视角依赖的色调,没有颜料.
    • 由重叠数组生成的莫伊尔图案可以产生动态的视觉效果.
    • 微镜头阵列 (MLA) 和微模式阵列 (MPA) 是关键的微光学组件.

    研究的目的:

    • 开发一种低成本的方法来生成具有结构色彩的3D动态moiré图像.
    • 为了增强光学薄膜的虹彩特性.
    • 在moiré图像中展示运动依赖的视觉效果.

    主要方法:

    • 在聚膜上的微型图形阵列 (MPA) 上叠加微镜头阵列 (MLA).
    • 在MPA中使用两种类型的填充结构来实现结构色彩.
    • 通过热回流调节MLA结构参数以增强虹彩.

    主要成果:

    • 活的结构颜色在微型模式中成功地产生了.
    • 光学膜的虹彩效果通过MLA调制显著增强.
    • 在moiré图像中展示了直角和反向相对运动效应.

    结论:

    • 拟议的微结构装置提供了一种具有成本效益的方法,用于创建动态的结构色彩moiré图像.
    • 这种技术适用于绿色印刷和防伪的应用.
    • MLA和MPA的组合为先进的光学功能提供了一个多功能平台.