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相关概念视频

Distribution of Molecular Speeds01:27

Distribution of Molecular Speeds

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Updated: Sep 15, 2025

Spatial Profiling of Protein and RNA Expression in Tissue: An Approach to Fine-Tune Virtual Microdissection
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从空间转录组数据推断拓速度推断.

Yichen Gu1, Jialin Liu2, Kun H Lee2

  • 1Department of Electrical and Computer Engineering, University of Michigan, Ann Arbor, MI, USA.

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

本研究介绍了拓速度推理 (TopoVelo),这是一个新的模型,用于分析组织中的细胞命运过渡,使用空间转录基因数据. TopoVelo揭示了细胞相互作用和空间动态如何驱动组织发育和分化.

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Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
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科学领域:

  • 发展生物学 发展生物学
  • 计算生物学 计算生物学
  • 基因组学就是基因组学.

背景情况:

  • 了解组织发育需要整合细胞命运转变的空间和时间动态.
  • 细胞与细胞的相互作用,利基因素和迁移是组织形态发生的关键驱动因素.
  • 当前的模型往往缺乏空间分辨率来捕捉这些复杂的动态.

研究的目的:

  • 开发一个计算框架,拓速度推断 (TopoVelo),以共同推断空间和时间细胞命运动态.
  • 将TopoVelo应用于空间转录基因数据,用于分析组织发育和细胞分化.
  • 为模拟发育组织中的集体细胞行为提供基础.

主要方法:

  • 扩展RNA速度框架使用空间合微分方程来建模单细胞基因表达动态.
  • 从空间转录基因数据中估计细胞速度,特别是从正在发育的小鼠大脑皮层.
  • 从体外人类发育模型中生成和分析幻灯片序列数据.

主要成果:

  • TopoVelo成功地从空间转录基因数据中推断出空间和时间细胞命运动态.
  • 该模型识别了可解释的空间细胞状态依赖关系,与配体受体基因表达相关.
  • 揭示了小鼠神经管关闭的空间特征和早期人类差异化的空间模式.

结论:

  • TopoVelo提供了一种新的方法,将空间和时间维度纳入细胞命运过渡建模中.
  • 该框架促进了人们对局部细胞相互作用和组织范围内的动态如何促进发育的理解.
  • 这项工作为未来研究复杂组织中细胞的集体动态奠定了基础.