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相关概念视频

Mismatch Repair01:36

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Proofreading01:31

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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Adjusting a Traverse01:12

Adjusting a Traverse

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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相关实验视频

Updated: May 20, 2025

Large-area Scanning Probe Nanolithography Facilitated by Automated Alignment and Its Application to Substrate Fabrication for Cell Culture Studies
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Large-area Scanning Probe Nanolithography Facilitated by Automated Alignment and Its Application to Substrate Fabrication for Cell Culture Studies

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CryoPROS:使用人工智能生成的辅助粒子纠正偏向导致的错位.

Hui Zhang1, Dihan Zheng2,3, Qiurong Wu4,5,6

  • 1Qiuzhen College, Tsinghua University, Beijing, China.

Nature communications
|May 16, 2025
PubMed
概括
此摘要是机器生成的。

在冷电子显微镜 (cryo-EM) 中,CryoPROS纠正因偏好的方向而引起的粒子 misalignment. 这种计算框架改善了数据集的结构分辨率,这些数据集以前受到这个共同挑战的限制.

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Last Updated: May 20, 2025

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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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:

  • 偏好的方向是冷电子显微镜 (cryo-EM) 中的一个常见挑战,它阻碍了准确的3D结构重建.
  • 传统的方法很难克服由偏好的粒子方向引起的数据异构性.

研究的目的:

  • 引入cryoPROS,一种用于纠正冷EM数据中偏好方向的新型计算框架.
  • 为了提高粒子对齐的准确性,使用自主监督的深度生成模型进行辅助粒子生成.

主要方法:

  • 克里奥普罗斯共同精炼原始和生成的辅助颗粒,以纠正错位.
  • 使用自我监督的深度生成模型创建辅助粒子.
  • 该框架在各种数据集上进行了测试,包括HA-trimer,P001-Y,NaX和激素敏感的脂酶二聚体.

主要成果:

  • 克里奥普罗斯在一个未经测试的HA-trimer数据集上实现了近原子分辨率.
  • 从受偏好方向影响的三个实验数据集中,成功地解决了高分辨率结构.
  • 广泛的验证证实了cryoPROS的稳定性及其引入模型偏差的低风险.

结论:

  • 解决由于偏好的方向导致的错位,可以显著改善冷EM密度图.
  • 对于以前由于偏好的方向而被认为是有问题的数据集,CryoPROS提供了一个强大的解决方案.
  • 这些发现表明,在许多冷EM研究中,使用适当的计算策略,可以克服偏好的导向.