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相关概念视频

Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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相关实验视频

Updated: Jun 25, 2025

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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在DNA数据存储中使用丢失式压缩增强信息密度.

Seongjun Seo1, Anshula Tandon1, Keun Woo Lee2

  • 1Department of Physics and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea.

Advanced materials (Deerfield Beach, Fla.)
|May 23, 2024
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概括

新的脱氧核糖核酸 (DNA) 损耗压缩模型将图像编码为DNA序列,用于高密度存储. 模型B2提供优越的信息密度和图像恢复,显示生物数据存储的希望.

关键词:
DNA数据存储 DNA数据存储这是MNIST分类的分类.图像质量评估 图像质量评估信息密度是指信息的密度.有损压缩的压缩.

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科学领域:

  • 生物技术是生物技术.
  • 数据存储数据存储数据存储
  • 生物信息学是一种生物信息学.

背景情况:

  • 传统的数据存储在密度和寿命方面面临限制.
  • 脱氧核糖核酸 (DNA) 为高密度数据存档提供了一个有希望的替代方案.
  • 有效的压缩算法对于基于DNA的数据存储至关重要.

研究的目的:

  • 开发和评估用于图像编码的新型脱氧核糖核酸 (DNA) 损耗压缩模型.
  • 为了提高信息密度,并使DNA序列的高保真度图像恢复成为可能.
  • 为了比较DNA压缩模型的性能与已建立的方法,如联合摄影专家组 (JPEG).

主要方法:

  • 为灰度图像开发两个DNA损耗压缩模型 (A模型和B模型).
  • 模型A使用重叠的像素域与线性插值 (LI).
  • 模型B采用非重叠域与最近邻域插值 (NNI).
  • 使用修改国家标准与技术研究所 (MNIST) 数据集对JPEG压缩进行比较分析.
  • 使用卷积神经网络 (CNN) 性能验证图像识别能力.

主要成果:

  • DNA损耗压缩模型在信息密度和图像恢复方面比JPEG具有竞争优势.
  • 模型B2是模型B的一个变体,每核酸的比特密度是典型的20倍以上.
  • 来自MNIST数据集的解压缩图像显示高可识别性,得到CNNs的验证.
  • 模型B2有效地平衡了高信息密度与良好的图像质量.

结论:

  • 基于DNA的数据存储系统为高密度和高效的数据压缩提供了可行的解决方案.
  • 开发的DNA损耗压缩模型,特别是B2模型,代表了生物数据存储的重大进步.
  • 这项研究表明,DNA作为长期,高容量数据存档的媒介具有前景.