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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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相关实验视频

Updated: Jun 7, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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使用单个半球间深度电极同时采样两种带状回旋:技术说明.

Sahar Farhat1, Jawad Melhem1, Houssein Darwish2

  • 1Department of Neurology, American University of Beirut Medical Center, Beirut, Lebanon.

Surgical neurology international
|August 7, 2024
PubMed
概括

同时将深度电极放置在带状环周中,对于治疗是可行的. 猎大脑的解剖学变化会影响电极的定位,影响前和中间环状回路的采样.

关键词:
状状 (Cingulate gyrus) 是一个状状.深度电极是深度电极.是一种病.虚假的脑袋 (Falx Cerebri) 是一个非常古老的植物.采样 采样 采样立体电脑脑电图 (Stereoelectroencephalography) 是一种立体电脑电图.

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科学领域:

  • 神经外科 神经外科
  • 发病学 (Epileptology) 是一个专业的学科.
  • 神经解剖学是一个神经解剖学.

背景情况:

  • 同时采用深度电极采样带状,对抗药性具有临床价值.
  • 精确的解剖学区域 (前,中,后) 的环状回,通过单个电极可访问仍然不清楚.

研究的目的:

  • 为了研究成人和儿童的脑和带回形之间的解剖关系.
  • 确定使用单个深度电极同时采样前和中带的可行性.

主要方法:

  • 在50名儿科和成人受试者中研究了猎大脑 - 状环的解剖学.
  • 定义了代表插入电极的5毫米间隙的"A线",并评估了它在带状回形子区域内的位置.

主要成果:

  • 在大脑形态及其与大脑体的交叉点上观察到显著的个体间和与年龄相关的变化 (P=0.02).
  • 在72%的儿童和60%的成年人中",A线"落在中间带带状回路内.
  • "A线"位于16%的儿童和40%的成年人后侧带带状回环,前侧位于12%的儿童.

结论:

  • 在儿科和成人群体中,同时取取前和中间带带状环的样本是可行的.
  • 这项研究突出了大脑形态的显著个体间变异性及其对深度电极放置的影响.