人工离子通道显示了纠正电流行为
1CREST, Japan Science and Technology Corporation (JST), Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.
Journal of the American Chemical Society
|December 6, 2001
概括
研究人员开发了新的人造离子通道 (3和4),表现出电压依赖的整形. 这些合成通道显示出基于应用电压控制离子流动方向的潜力,这是生物模拟通道设计的关键步骤.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 生物仿真工程 生物仿真工程
背景情况:
- 人工离子通道对于理解生物运输和开发合成系统至关重要.
- 在自然界中,电压依赖的离子通道表现出校正,这是细胞功能必不可少的特性.
- 在超分子化学中,设计具有可控整形的合成通道仍然是一个重大挑战.
研究的目的:
- 合成新的电压依赖的人造离子通道 (化合物3和4).
- 为了研究这些合成分子的离子通道特性,特别是整化.
- 探索终端头组电荷和电压诱导的对齐在实现校正中的作用.
主要方法:
- 合成两种具有明显的水友终端组 (碳酸,酸) 的胆酸衍生物 (3和4).
- 将合成的通道纳入平面双层脂质膜.
- 使用平面双层脂质膜方法在不同pH值和应用电压下测量单个离子通道特性.
主要成果:
- 合成的人工离子通道3和4在电流电压图表中显示出明显的整正特性.
- 校正方向可以通过电压应用方法 (正或负转移结合) 控制.
- 结合过程中电压诱导的终端头组电荷的向量对齐被确定为电压依赖整正的必要条件.
结论:
- 成功合成了新型的人工离子通道,显示了电压依赖的整形.
- 该研究强调了控制终端组的方向和充电对于设计功能性人工离子通道的重要性.
- 这些发现有助于开发具有可调节性质的复杂合成离子运输系统.
更多相关视频
相关概念视频
01:25Calculation of Electric Flux
Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
01:10Electrical Current
Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). An ampere is the...
01:22Magnetic Force On Current-Carrying Wires: Example
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
01:17The Delta-to-Delta Circuit
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
01:30Control of Power Flow
There are several methods to control power flow in power systems:
01:21Power System Three-Phase Short Circuits
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...