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相关概念视频

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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Nucleic Acids02:43

Nucleic Acids

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
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Nucleic acids02:43

Nucleic acids

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
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Nucleic Acid Structure01:25

Nucleic Acid Structure

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
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Nucleic Acids and Nucleotides01:20

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
Deoxyribonucleic Acid (DNA)
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Kinetic Screening of Nuclease Activity using Nucleic Acid Probes
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宿主过的血液核酸用于病原体检测:共享的背景,稀少的信号和方法限制.

Zhaoxia Wang1, Guangchan Chen1, Mei Yang1

  • 1Department of Cardiology, Shanghai Pudong New Area Zhoupu Hospital (Shanghai Health Medical College Affiliated Zhoupu Hospital), Shanghai 201318, China.

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概括

无等离子细胞RNA (cfRNA) 的转基因组学面临着由于共享的背景微生物群的挑战. 病原体检测受到低信号丰度和背景复杂性的限制,而不是疾病特异性的变化.

关键词:
血液中的微生物组冠状动脉疾病是一种冠状动脉疾病.主机读取过器的过.低生物质污染的污染.没有血细胞的RNA.结核病是一种肺结核病.

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科学领域:

  • 转基因组学是指转基因组学.
  • 分子生物学分子生物学
  • 传染病诊断 传染病诊断 传染病诊断

背景情况:

  • 无等离子细胞RNA (cfRNA) 的转基因组学正在探索以血液为基础的病原体检测.
  • 背景的结构 背景的结构.
  • 血液中的微生物组
  • 复制性,cfRNA元基因组学的实际限制仍然不清楚.

研究的目的:

  • 批判性地重新分析和基准血cfRNA元基因组学用于病原体检测.
  • 评估共享背景微生物群对诊断性能的影响.

主要方法:

  • 从结核病 (TB) 和冠状动脉疾病 (CAD) 队列中对经过宿主过的血液RNA测序数据进行了重新分析.
  • 使用Kraken2和MetaPhlAn4进行严格的人类读取删除和分类分析的统一生物信息管道.

主要成果:

  • 分类的非宿主读数构成了cfRNA总数的一小部分,以低丰富度的背景种群为主.
  • 来自背景的签名显示了疾病和对照组之间的适度分离,具有高可变性.
  • 结核菌的读数稀少,并在结核病阴性样本中检测到,排除了强有力的歧视.

结论:

  • 血cfRNA元基因组学性能受到共享的,低复杂度的背景和稀疏的病原体信号的限制.
  • 透明的主机过,背景建模和直角测试对于可靠的病原体检测至关重要.