神经递质离子通过直径为1.01纳米的单壁碳纳米管的电动运动
Mark D Ellison1, Jacqueline Allen1, Michael Bonfiglio1
1Department of Chemistry, Ursinus College, 601 E. Main St., Collegeville, Pennsylvania 19426, United States.
概括
这项研究揭示了通过单壁碳纳米管 (SWNTs) 增强神经递质如乙胆和多巴胺的离子运输. 在SWNT内部的离子流动性明显比散装更快,受pH和离子结构等因素的影响.
科学领域:
- 纳米技术 纳米技术
- 物理化学 物理化学
- 生物物理学的生物物理.
背景情况:
- 通过纳米级通道了解离子运输对于开发先进的分离和传感技术至关重要.
- 单壁碳纳米管 (SWNTs) 为分子运输研究提供了独特的特性,因为它们的定义尺寸和高表面积.
研究的目的:
- 通过SWNT研究生物相关子 (乙胆,胆,多巴胺) 的运输动态.
- 将它们的运输行为与无机离子 () 和有机分子 (素) 进行比较.
- 阐明环境因素 (如pH值) 对离子流动性和吸附/脱附动力学的影响.
主要方法:
- 用分子动力学模拟来研究通过1.01纳米直径的SWNT.的离子运输.
- 在不同的pH条件下进行了电泳性移动性测量.
- 分析了吸附和脱吸动力学,以了解离子壁相互作用.
主要成果:
- 与散装运输相比,所有研究的离子在SWNT中表现出显著增强的电泳运动性.
- 乙胆,胆和离子的移动性依赖于pH值,由于表面电荷和,随着pH值的下降而增加.
- 多巴胺和氨酸显示出pH独立的流动性,这归因于它们的环结构和大小.
结论:
- 通过SWNTs的离子传输显著增强,为新型应用提供了潜力.
- 离子特性 (电荷,大小,结构) 和SWNT表面特征之间的相互作用决定了运输行为和pH依赖.
- 吸附和脱吸动力学在纳米管内的整体离子流动性中起着至关重要的作用.
相关概念视频
01:21Electrochemical Gradient and Channel Proteins: An Overview
1.9K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
1.9K
01:31Action Potential
7.6K
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
7.6K
01:41Action Potentials
126.4K
Overview
126.4K
01:05Mechanism of Ciliary Motion
3.5K
The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
3.5K
01:19The Role of Ion Channels in Neuronal Computation
3.1K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.1K
01:23Propagation of Action Potentials
4.9K
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
4.9K