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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.2K
Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
3.2K
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.4K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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相关实验视频

Updated: Jun 5, 2025

A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion
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A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion

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UPicker:一种半监督的颗粒采集变压器方法,用于冷-电磁显微镜.

Chi Zhang1, Yiran Cheng2, Kaiwen Feng1

  • 1State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou 310058, Zhejiang, China.

Briefings in bioinformatics
|December 10, 2024
PubMed
概括
此摘要是机器生成的。

UPicker是一种新的半监督方法,通过使用未标记的数据进行初始训练来改进冷电子显微镜的粒子选择. 这减少了对手工标签的依赖,提高了结构重建的准确性和稳定性.

关键词:
低温电磁波冷却器 (Cryo-EM) 是一个非常好的方法.对象检测检测对象检测对象检测颗粒采集 颗粒采集变压器变压器变压器变压器没有监督的预训练.

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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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相关实验视频

Last Updated: Jun 5, 2025

A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion
13:43

A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion

Published on: January 31, 2022

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Cryo-EM and Single-Particle Analysis with Scipion
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Cryo-EM and Single-Particle Analysis with Scipion

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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科学领域:

  • 结构生物学 结构生物学
  • 生物物理学的生物物理.
  • 计算生物学 计算生物学

背景情况:

  • 自动粒子采集对于冷电子显微镜 (cryo-EM) 结构重建至关重要.
  • 当前的深度学习方法需要广泛的手动标签,导致偏差和噪音数据的低于最佳性能.

研究的目的:

  • 开发UPicker,一种半监督的基于变压器的方法,用于在冷EM中准确和强大的颗粒采集.
  • 为了减少对劳动密集型手动数据标签的需求.

主要方法:

  • UPicker采用了两阶段的培训:无监督的预培训,采用适应拉普拉斯的高斯 (LoG) 区域提案生成器进行伪标签,然后进行监督的微调.
  • 采用对比性报名和混合数据增强来提高性能和处理有限的标记数据.

主要成果:

  • UPicker 在模拟和实验冷电磁数据集上实现了最先进的准确性和稳定性.
  • 与现有方法相比,表现出优越的性能,特别是在有限的标记数据下.

结论:

  • UPicker提供了一种有效的半监督方法,用于冷EM中单颗粒采集.
  • 该方法显著降低了手动标签的负担,同时提高了重建质量.