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相关概念视频

Cluster Sampling Method01:20

Cluster Sampling Method

11.1K
Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
11.1K
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

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Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.9K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.9K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Outlier removal in cryo-EM via radial profiles.

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Centering Noisy Images with Application to Cryo-EM.

SIAM journal on imaging sciences·2022
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The Role of Redundant Bases and Shrinkage Functions in Image Denoising.

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Reducing bias and variance for CTF estimation in single particle cryo-EM.

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相关实验视频

Updated: May 6, 2026

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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在所有中采用非参数的粒子采集方法.

Evgeny Hershkovitch Neiterman1, Ayelet Heimowitz2, Gil Ben-Artzi1

  • 1School of Computer Science, Ariel University, Ariel, Israel.

Journal of structural biology
|May 7, 2025
PubMed
概括

这项研究引入了一种单粒子冷电子显微镜 (cryo-EM) 的新方法,用于检测所有电影中的断层影像投影. 这种方法保留了传统的运动校正和平均技术中丢失的有价值的信息.

科学领域:

  • 结构生物学 结构生物学
  • 生物物理学的生物物理.
  • 显微镜的使用方法

背景情况:

  • 单粒子冷电子显微镜 (cryo-EM) 对于确定宏分子结构至关重要.
  • 传统的冷电磁方法通过运动校正和平均值来排除每信息.
  • 利用原始电影可以提高冷EM结构分辨率.

研究的目的:

  • 开发一种新的非参数方法,用于检测冷EM电影中的断层影像投影.
  • 能够利用每个框架中的信息来进行增强的结构重建.
  • 为了建立一个基础的步骤,朝着一个新的范式在冷EM数据处理.

主要方法:

  • 一种非参数方法,其灵感来源于结构从运动 (SfM) 原则.
  • 基于跨电影的时间一致性的断层影像投影的检测.
  • 方法独立于运动校正,CTF估计和初始重建.

主要成果:

  • 在粒子检测中显示出较低的异常率.
  • 实现了与现有方法相比精确的粒子定位.
  • 成功地将该方法应用于整个电影序列.

结论:

关键词:
低温电子显微镜的使用方法微图片 微图片 微图片颗粒采集 颗粒采集一个单粒子重建的重建.

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  • 开发的方法是利用冷EM电影中的所有信息的重要第一步.
  • 这种方法为改善重建的宏分子结构的质量提供了一个有希望的途径.
  • 时间一致性分析为冷EM数据中的粒子检测提供了强大的框架.