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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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関連する実験動画

Updated: Jul 10, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

原子を単一の光子で捕まえる.

Pinkse1, Fischer, Maunz

  • 1Max-Planck-Institut fur Quantenoptik, Garching, Germany.

Nature
|April 4, 2000
PubMed
まとめ
この要約は機械生成です。

研究者らは光力を使って一つの原子を光学腔の中に閉じ込めました. この突破は,単一の量子オブジェクトのリアルタイム観測と制御を可能にし,量子情報処理アプリケーションの道を開く.

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Compact Quantum Dots for Single-molecule Imaging
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Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
14:43

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions

Published on: August 27, 2014

関連する実験動画

Last Updated: Jul 10, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
14:43

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions

Published on: August 27, 2014

科学分野:

  • 量子光学とは,量子光学である.
  • 原子物理学 原子物理学とは
  • 洞穴量子電動力学とは

背景:

  • フォトン-原子結合状態に関する初期の提案には,マイクロ波の空洞が含まれていたが,十分な光の力が欠けていた.
  • 光学フォトンはより強い力を発揮しますが,原子分解と空洞の損失という課題に直面します.
  • 外部レーザー刺激と空洞伝送モニタリングは,原子の観測とトラップに不可欠です.

研究 の 目的:

  • 高精度空洞に光学フォトンを用いて単一の原子を閉じ込めることを実証する.
  • 原子の位置と動態の継続的な観測を可能にするために.
  • 量子情報処理における潜在的な応用を探求する.

主な方法:

  • 高精度光学空洞を利用して,原子を捕まえる実験を行う.
  • 単一の原子による空洞伝送の変化によって誘発されるフィードバックスイッチを使用します.
  • 送信された光の強度を使用して,空洞内の原子の振動運動を監視します.

主要な成果:

  • 平均1フォトンの光の場に単一のゆっくりとした原子を成功裏に閉じ込めました.
  • 原子の運動に対応する,発射された光の強度の観測された振動.
  • 洞穴の静止波反ノード間の原子移動に起因する強度相関データにおける周期的構造を特定した.

結論:

  • 光学空洞とフィードバック制御を使用して単一の原子を捕まえて観察するための新しい方法を実証しました.
  • このシステムは,単一の量子オブジェクトのダイナミクスを研究するためのプラットフォームを提供します.
  • 量子情報処理と基礎物理学の研究における潜在的な応用.