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相关概念视频

Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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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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相关实验视频

Updated: May 7, 2026

Biological Sample Preparation by High-pressure Freezing, Microwave-assisted Contrast Enhancement, and Minimal Resin Embedding for Volume Imaging
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两种用于传统实验室和RapidHITTM ID工作流程的简化牙样本准备方法.

Morgan Eaton1, M Shane Woolf1, Samyuktha Pemmasani1

  • 1Department of Forensic Science, Virginia Commonwealth University, Richmond, Virginia, USA.

Journal of forensic sciences
|September 5, 2024
PubMed
概括

简化牙科DNA提取方法提供了灾难受害者快速识别 (DVI). 低技术的牙准备与RapidHITTM ID分析相结合,可以产生完整的STR概况,帮助法医调查.

关键词:
在DNA分析中,分析DNA.个人资料 DNA DNA 档案RapidHIT® 识别系统的识别系统.灾难受害者身份识别 (DVI)快速的 DNA DNA 快速的 DNA一个牙样本.

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科学领域:

  • 法医科学 法医科学 法医科学
  • 遗传学 是一个遗传学.
  • 人类学是人类学.

背景情况:

  • 灾难受害者识别 (DVI) 在发生大规模伤亡事件后至关重要.
  • 人类牙残骸在软组织退化时提供了宝贵的核DNA来源.
  • 传统的法医DNA工作流程需要经过训练的人员进行广泛的样本准备.

研究的目的:

  • 评估牙DNA提取的简化样品制备协议.
  • 为了比较传统的法医DNA工作流程与应用生物系统® RapidHITTM ID仪器对DVI的有效性.

主要方法:

  • 经过两种简化协议,处理了10颗叶落牙.
  • 样品被使用爪进行碎片化,用于RapidHITTM ID,或用咖啡机粉碎,用于传统的工作流程.
  • 分析了短串联重复 (STR) 基因组检测和峰值高度比率 (PHRs).

主要成果:

  • 在RapidHITTM ID (99.0%) 和GlobalFilerTM (99.8%) 之间观察到相似的STR等位基因检测率.
  • 平均内异构细胞的PHRs是相似的:RapidHITTM ID (0.80) 和GlobalFilerTM (0.86).它们是相同的.
  • 快速HITTM ID工作流标记了90%的样本进行审查,其中91%的等位基因通过了质量指标,而GlobalFilerTM则为100%.

结论:

  • 通过简化,低技术的牙碎片,然后通过RapidHITTM ID分析,可以从老牙样本中生成完整的STR配置文件.
  • 需要进一步的研究来完善挑战样本的协议,并使现场 DVI.
  • 这些方法有望提高DVI流程的速度和可访问性.