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相关概念视频

Isotopes01:12

Isotopes

63.3K
Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
An element's atomic mass, or weight,...
63.3K
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

125.2K
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
125.2K
Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

11.1K
In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing...
11.1K
Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

3.9K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
3.9K
Body Temperature01:07

Body Temperature

1.4K
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
1.4K
Body Temperature01:25

Body Temperature

4.1K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
4.1K

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相关实验视频

Updated: Jan 22, 2026

The Use of Drip Flow and Rotating Disk Reactors for Staphylococcus aureus Biofilm Analysis
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The Use of Drip Flow and Rotating Disk Reactors for Staphylococcus aureus Biofilm Analysis

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凝聚同位素温度重建使用斯塔拉格米特滴滴杯.

Stuart Umbo1,2, Maria Box1, Aviva Intveld3

  • 1School of Geography and Natural Sciences, Northumbria University, Newcastle-Upon-Tyne, UK.

Rapid communications in mass spectrometry : RCM
|January 20, 2026
PubMed
概括

斯普利奥塞姆滴水杯提供了一个有前途的方法,可以准确地重建古气温,尽管有轻微的动力效应. 这种方法增强了对过去气候的理解,使用洞穴沉积物中的凝聚同位素温度计.

关键词:
碳酸盐是一种碳酸盐.聚合的同位素聚集在一起.滴水杯是一个滴水杯.同位素平衡是同位素的平衡.古代气候 古代气候 古代气候它们的洞穴.温度重建重建的重建

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Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
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High Precision Zinc Isotopic Measurements Applied to Mouse Organs
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The Use of Drip Flow and Rotating Disk Reactors for Staphylococcus aureus Biofilm Analysis
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Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
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科学领域:

  • 地质化学 地质化学
  • 古气候学 古气候学
  • 同位素地球化学 同位素地球化学

背景情况:

  • 洞穴中聚合同位素温度测量在空中形成期间受到动力分成的限制,导致不准确的温度估计.
  • 墓穴是有价值的陆地档案,用于准确的约会和了解过去的气候.
  • 洞穴中滴滴杯可以创建水下环境,潜在地减轻动力效应.

研究的目的:

  • 通过聚类同位素分析,评估speleothem滴水杯的可靠性,用于古气温度重建.
  • 为了研究动力分离在水下和空中潜水环境中的影响.
  • 开发一种方法,用于测试speleothem样本中的动力效应.

主要方法:

  • 在石岩MAYA 22-7 (年代为公元1650年±23年) 中,在滴水杯上采样同时层.
  • 测量稳定同位素 (δ18O, δ13C) 和聚集同位素 (Δ47) 在从滴水杯中心的不同距离.
  • 在水下滴滴杯区域和空中侧面之间的同位素值的比较.

主要成果:

  • 水下滴水杯区域显示较低的 δ18O 和 δ13C 和较高的 Δ47 值,表明动力分离减少.
  • 从水下样本中聚集的同位素温度 (TΔ47) 比现代洞穴温度高1°C-2°C.
  • 推断的古气温度比区域估计温度高3°C-7°C,这表明持续的动力效应.

结论:

  • 水下滴水杯样本提供了比空中样本更准确的古气温推断,因为降水接近平衡.
  • 斯佩利奥塞姆滴水杯显示出可靠的古气温重建的潜力.
  • 描述了一种广泛适用的测试,用于在speleothem滴水杯中发现聚合同位素的动力效应.