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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

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Updated: Jul 11, 2026

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
06:06

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Published on: August 17, 2016

使用同位素的高分辨率层图.

D J Depaolo, B L Ingram

    Science (New York, N.Y.)
    |February 22, 1985
    PubMed
    概括

    海洋化石中-87/-86的同位素比率准确地确定了沉积岩的年代. 这种地质化学方法为地质学和古生物学研究提供了高分辨率的年龄相关性.

    科学领域:

    • 地质化学 地质化学
    • 古生物学的古生物学
    • 海洋学 海洋学 海洋学

    背景情况:

    • 现代海水中-87/-86 (87Sr/86Sr) 的同位素比例相对不变.
    • 然而,这种比率在地质时间尺度上逐渐发生变化.
    • 海洋生物将海水中的融入其碳酸外中,在外形成时记录海洋87Sr/86Sr比率.

    研究的目的:

    • 评估87Sr/86Sr同位素比在化石海洋碳酸贝中对于地球时间学的有用性.
    • 确定这种方法在沉积岩的高分辨率年龄相关性方面的潜力.

    主要方法:

    • 在化石海洋碳酸贝中高精度测量87Sr/86Sr同位素比率.
    • 分析由积累的化石碳酸外组成的沉积岩.

    主要成果:

    • 化石中的87Sr/86Sr比率是沉积时海洋同位素组成的可靠代理.
    • 高精度测量允许精确的约会和沉积物序列的相关性.

    结论:

    • 87Sr/86Sr约会方法提供了与其他成熟技术相比的年龄分辨率.
    • 这种地化学方法对于解决地质学,古生物学,古海洋学和地化学中的各种问题是有价值的.

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