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Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Updated: Jul 16, 2025

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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用扫描电子显微镜研究不同死后间隔的根透明度.

Elodie Marchand1,2, Benoit Bertrand1,3, Valéry Hedouin1

  • 1Unité de Taphonomie Médico-Légale et Anatomie, ULR 7367, Faculté de Médecine, Université de Lille, 59000 Lille, France.

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概括
此摘要是机器生成的。

硬化牙的结构变化揭示了死后间隔 (PMI) 的变化. 这些通过扫描电子显微镜观察到的牙修饰,有助于估计法医和考古学案例死后的时间.

关键词:
估计死亡时的年龄.法医科学 法医科学 法医科学死亡后的变化根的透明度 根的透明度扫描电子显微镜扫描电子显微镜硬化性牙的牙.塔法诺米 (taphonomy) 是一种语法学.

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科学领域:

  • 法医人类学 法医人类学
  • 牙科法医医学 牙科法医医学
  • 古病理学 古病理学

背景情况:

  • 准确的年龄估计对于在法医中识别人类遗骸至关重要.
  • 根牙透明度是成年牙年龄估计的常用方法.
  • 丹丁透明的可靠性在考古学背景下受到质疑,因为它不一致.

研究的目的:

  • 通过各种死后间隔 (PMI) 调查硬化牙的结构变化.
  • 评估硬化牙分析在法医和考古样本中估计死亡时间的实用性.

主要方法:

  • 分析了21个人类单根牙,其PMI为0,1,2和5年,再加上考古样本.
  • 样品的准备包括树脂的加入,切割和抛光.
  • 扫描电子显微镜 (SEM) 和能量分散式X射线 (EDX) 微分析用于结构和化学评估.

主要成果:

  • 随着PMI的增加,SEM揭示了明显的管状修饰,包括周管状项圈的损失和超密度物质阻塞的光线.
  • EDX微分析显示了不同PMI的酸比率的变化,特别是在肉和犬类区域.
  • 观察到的变化表明,死后对硬化牙的矿物阶段发生了改变.

结论:

  • 硬化牙表现出与死后间隔相关的结构和化学变化.
  • 这些修改有可能改善法医和考古人类遗骸的年龄估计.
  • 假设化学和/或细菌作用驱动了硬化牙的死后变化.