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相关概念视频

MOSFET: Depletion Mode01:20

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
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In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
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在负偏移频率下,二甲基硫氧化物的CEST效应.

Haoyun Su1,2, Lok Hin Law1, Yang Liu1,2

  • 1Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, China.

NMR in biomedicine
|August 12, 2024
PubMed
概括

二甲基硫氧化物 (DMSO) 和类似的溶剂产生独特的化学交换和转移 (CEST) 信号. 这种新的CEST检测方法允许对药物纳米载体和溶剂-药物相互作用进行无标签成像.

关键词:
在CEST中,CEST是CEST.这就是DMSO.药物输送是药物输送的过程.在诺伊尔.

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科学领域:

  • 生物医学应用程序
  • 磁共振成像是一种磁共振成像技术.
  • 化学交换和转移 (CEST) 是指化学交换和转移.

背景情况:

  • 甲基二硫氧化物 (DMSO) 广泛用于生物医学应用,包括作为冷保护剂和药物载体.
  • 目前监测药物输送系统的方法可能有限.

研究的目的:

  • 研究DMSO产生可检测的化学交换和转移 (CEST) 信号的潜力.
  • 探索DMSO-CEST用于成像药物纳米载体的应用.

主要方法:

  • 对DMSO及其结构类似物进行了分析,以生成CEST信号.
  • 可以通过CEST检测到的巴比酸 (BA) 被溶解在DMSO中并装入脂质体中进行成像.
  • 分子相互作用和磁化转移通路的分析,包括中继核Overhauser增强 (rNOE).

主要成果:

  • 发现DMSO在大约-2 ppm时产生了明显的CEST信号.
  • DMSO的结构类型也在负偏移频率 (-1.4至-3.8 ppm) 的范围内显示了CEST信号.
  • 将DMSO和巴比图里酸同时加载到脂质体中,导致可观测的CEST峰值,使得无标签的监测成为可能.

结论:

  • 通过与水的相互作用,可以使用CEST MRI检测DMSO等有机溶剂.
  • 这为成像药物纳米载体和研究溶剂-药物相互作用提供了一种新的,无标签的方法.
  • 这些发现为CEST在生物医学成像和药物输送研究中的应用开辟了新的途径.