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相关概念视频

Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Channel Rhodopsins

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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相关实验视频

Updated: May 16, 2025

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

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兰化物选择性人工道

Harekrushna Behera1,2, Tyler J Duncan1, Laxmicharan Samineni1,2

  • 1McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States.

ACS nano
|April 4, 2025
PubMed
概括

这项研究引入了新型的超分子膜通道,以高效地分离兰化物,为中型兰化物 (如欧和) 提供高选择性. 这一突破有望实现更绿色,更具成本效益的稀土元素净化和回收.

关键词:
离子通道 离子通道兰化 兰化物分离纳米孔是一种纳米孔.支柱[5]arene 是一个支柱.稀土元素 稀土元素 稀土元素

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 分离科学 分离科学

背景情况:

  • 兰化物对现代技术至关重要,但由于效率低下的分离方法,其净化对环境造成了沉重的负担.
  • 目前的方法,如溶剂提取是昂贵的,并产生大量的废物,需要先进的分离解决方案.

研究的目的:

  • 开发一种新型的超分子膜通道,用于高度选择性的兰化离子分离.
  • 评估这些通道的效率和选择性,对其他金属离子和化物中等化物 (Eu,Tb) 进行比较.

主要方法:

  • 使用柱体[5]arene支架与二烯氧化物 (DPP) 连接物制造超分子膜通道.
  • 运输实验用于测量通过膜通道的离子选择性.
  • 分子动力学模拟以阐明离子选择性的机制.

主要成果:

  • 膜通道对中等兰坦化物 (Eu,Tb) 具有较高的运输选择性,超过单价离子 (K+,Na+) 和常见双价离子 (Ca2+,Mg2+).
  • 实现了异常的兰化物-兰化物选择性,Tb3+/La3+的选择性约为140和Eu3+/Nd3+的选择性约为17.
  • 选择性明显超过了使用传统溶剂提取技术获得的选择性.

结论:

  • 开发的超分子膜通道为兰坦化物分离提供了高度选择性和有效的方法.
  • 正如模拟所指出的那样,道内的水介导相互作用是观察到的高选择性的关键.
  • 这种方法有可能提高化净化和回收的可持续性和成本效益.