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Zernike phase contrast cryo-electron tomography

机译:泽尼克相衬低温电子层析成像

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Cryo-tomography in the electron microscope is unique in its ability to provide high-resolution, three-dimensional structural information about cells, organelles and macromolecules in a nearly native, frozen-hydrated state. However, the phase-contrast imaging method used in conventional cryo-electron tomography fails to faithfully represent the full range of structural features in such specimens. Only certain features are recorded with adequate contrast, and overall contrast is low. The recently developed Zernike phase contrast method has the potential to solve this problem, and here we apply it for the first time to cryo-electron tomography. The new method has uniform transfer characteristics for a wide range of spatial frequencies, leading to improved overall signal-to-noise ratio and raising the prospects of higher resolution and quantitative representation of specimen densities in the reconstructed tomograms.
机译:电子显微镜中的低温断层扫描技术具有独特的能力,能够以几乎天然的冷冻水合状态提供有关细胞,细胞器和大分子的高分辨率三维结构信息。然而,在常规的低温电子断层扫描中使用的相衬成像方法无法如实地代表此类标本的全部结构特征。仅记录某些特征并具有足够的对比度,并且总体对比度较低。最近开发的Zernike相衬法具有解决这一问题的潜力,在这里,我们首次将其应用于低温电子层析成像。该新方法在宽范围的空间频率上具有统一的传输特性,从而改善了整体信噪比,并提高了在重建的层析X射线照片中更高分辨率和定量表示标本密度的前景。

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