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相关概念视频

Short-distance Transport of Resources02:12

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

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相关实验视频

Updated: May 10, 2026

Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae
09:40

Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae

Published on: September 23, 2011

没有共价集成的搭便车.

Michael Botchan1

  • 1Department of Cell and Molecular Biology and Division of Biochemistry and Molecular Biology, The University of California, Berkeley, Berkeley, CA 94720, USA.

Cell
|April 28, 2004
PubMed
概括
此摘要是机器生成的。

像乳头瘤病毒这样的潜伏病毒附着在宿主染色体上进行细胞分裂. 这项研究揭示了参与动物乳头瘤病毒保留在染色体上的细胞蛋白,为病毒持久性提供了新的见解.

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Site-Directed φC31-Mediated Integration and Cassette Exchange in Anopheles Vectors of Malaria
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Site-Directed φC31-Mediated Integration and Cassette Exchange in Anopheles Vectors of Malaria

Published on: February 2, 2021

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
06:17

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

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相关实验视频

Last Updated: May 10, 2026

Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae
09:40

Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae

Published on: September 23, 2011

Site-Directed φC31-Mediated Integration and Cassette Exchange in Anopheles Vectors of Malaria
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Site-Directed φC31-Mediated Integration and Cassette Exchange in Anopheles Vectors of Malaria

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Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
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Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

Published on: February 28, 2025

科学领域:

  • 病毒学 病毒学
  • 分子生物学分子生物学
  • 细胞生物学 细胞生物学

背景情况:

  • 许多潜伏病毒以非性方式附着在真核细胞的线性染色体上.
  • 这种附件确保了细胞分裂期间的病毒基因组分割.
  • 虽然已知病毒元素,但调解这种染色体结合的细胞因素在很大程度上仍未定义.

研究的目的:

  • 为了确定细胞蛋白机械,负责动物乳头瘤病毒保留在线粒染色体.
  • 提供第一个洞察力,涉及到病毒情节分区的宿主因素.

主要方法:

  • 该研究可能采用蛋白质学方法来识别相互作用的合作伙伴.
  • 免疫沉和显微镜等技术可能用于验证相互作用和定位.
  • 可能进行了功能性测试,以评估已识别的蛋白质在病毒保留中的作用.

主要成果:

  • 该研究确定了与动物乳头瘤病毒发作相互作用的特定细胞蛋白.
  • 这些蛋白质对于将病毒DNA与线粒染色体结合至关重要.
  • 这些发现阐明了病毒基因组稳定性和传播的关键机制.

结论:

  • 这项研究揭示了参与动物乳头瘤病毒染色体结合的重要宿主细胞因素.
  • 这提供了对病毒持久机制的基本理解.
  • 这些发现为针对病毒保留的治疗策略开辟了道路.