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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Molecular Models02:00

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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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.
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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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通过二维通道进行弹道分子运输

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概括

通过纳米级通道的气体运输可以无摩擦且极快,这是由于光谱表面散射,挑战了传统的克努森理论,并在室温下揭示了量子效应.

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科学领域:

  • 纳米科学与工程
  • 表面物理和化学
  • 量子力学

背景情况:

  • 通过纳米孔气体的透对于自然过程和技术至关重要.
  • 克努森理论假设散射,通常描述气体在小孔中的流动.
  • 很少观察到光谱反射,这限制了对气体表面相互作用的理解.

研究的目的:

  • 在原子平面的格斯特罗姆级通道中研究气体运输机制.
  • 探索表面原子场景和量子效应对气体散射的影响.
  • 在量子尺度上展示受控的气体运输现象.

主要方法:

  • 使用石墨烯,化和硫化制造斯特罗姆尺度通道.
  • 通过这些通道测量气和气/气的透度.
  • 与表面地形和量子力学特性相关的气体运输行为分析.

主要成果:

  • 在石墨烯和化通道中观察到光谱表面散射,导致弹道运输和显著增强的流.
  • 由于表面波纹较大,二硫化通道的透速度较慢,与Knudsen扩散相一致.
  • 观察到/流的反向同位素效应,表明量子物质波贡献.

结论:

  • 在纳米级道中的表面散射可以是镜像式的,由原子景观和量子效应驱动,即使在室温下也是如此.
  • 在精确设计的道中可以实现弹道无摩擦气体运输.
  • 这些发现为原子气体运输提供了新的见解,并为量子控制的纳米流提供了新的可能性.