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関連する概念動画

Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
732
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
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.
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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関連する実験動画

Updated: Mar 19, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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再イオン化時代における高赤偏移銀河からの酸素放射線の検出

Akio K Inoue1, Yoichi Tamura2, Hiroshi Matsuo3

  • 1College of General Education, Osaka Sangyo University, 3-1-1 Nakagaito, Daito, Osaka 574-8530, Japan. akinoue@las.osaka-sandai.ac.jp.

Science (New York, N.Y.)
|June 18, 2016
PubMed
まとめ
この要約は機械生成です。

宇宙再イオン化の初期 銀河は酸素と塵が少ない この研究では 酸素の放出が検出され 星間塵と中性ガスが稀な銀河を明らかにし 陽子の脱出を可能にしました

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Detecting, Visualizing and Quantitating the Generation of Reactive Oxygen Species in an Amoeba Model System
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Detecting, Visualizing and Quantitating the Generation of Reactive Oxygen Species in an Amoeba Model System

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Detection of Total Reactive Oxygen Species in Adherent Cells by 2',7'-Dichlorodihydrofluorescein Diacetate Staining
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Last Updated: Mar 19, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Detection of Total Reactive Oxygen Species in Adherent Cells by 2',7'-Dichlorodihydrofluorescein Diacetate Staining
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科学分野:

  • 天文学と天体物理学
  • 宇宙学
  • 銀河の進化

背景:

  • 初期の銀河の星間介質 (ISM) を理解することは,再イオン化の時代にとって極めて重要です.
  • 銀河間の媒質に電離放射線の逃亡に影響する.

研究 の 目的:

  • 初期の宇宙における 銀河の物理的性質と元素の豊富さを調べる
  • 宇宙再イオン化における 銀河のISMの役割を決定する

主な方法:

  • アタカマの大型ミリメートル/サブミリメートル配列 (ALMA) を観測に使用した.
  • 88ミクロメートルの酸素放射線を検出した
  • 遠赤外線と炭素放射線を探した

主要な成果:

  • ビッグバンから7億年後の 銀河から酸素の放出が検出されました
  • 推定酸素の豊富さは太陽の ~ 10% です.
  • 恒星間塵の不足と 異常に少量の中性ガスを観測した

結論:

  • 銀河の金属と塵の含有量が低いので イオン化フォトンの 効率的な脱出が考えられます
  • これらの性質は 宇宙の再イオン化における 銀河の役割を支えています