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相关概念视频

DNA as a Genetic Template02:05

DNA as a Genetic Template

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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
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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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DNA Replication02:40

DNA Replication

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
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The Nucleosome01:19

The Nucleosome

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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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相关实验视频

Updated: Jun 15, 2025

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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一个原始的DNA存储和计算引擎.

Kevin N Lin1, Kevin Volkel2, Cyrus Cao1

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA.

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此摘要是机器生成的。

本研究介绍了一种基于DNA的系统来存储和计算数据,利用基于纤维素的粒子来提高稳定性和可访问性. 它为分子信息技术提供了一条新的道路.

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科学领域:

  • 分子信息技术 分子信息技术
  • 生物分子工程 生物分子工程
  • 数据存储数据存储数据存储

背景情况:

  • 现代信息系统需要稳定的数据存储,读写能力和可编程执行.
  • 新兴的分子信息技术需要对这些核心功能进行原则证明.
  • DNA提供了高信息密度和并行处理潜力.

研究的目的:

  • 开发一种基于DNA的存储和计算引擎.
  • 为了证明稳定的数据存储和检索,在新型基板上使用DNA.
  • 为了使酶计算和数据操纵与DNA.

主要方法:

  • 将图像文件编码到DNA中,并将其吸附到多孔的纤维素酸盐颗粒上 ("dendricolloids").
  • 通过冷化,再水和加速衰老研究,评估DNA在树脂类基质上的稳定性和寿命.
  • 使用合成促进剂通过RNA转录和随后的纳米孔测序和酶计算来实现非破坏性的数据访问.

主要成果:

  • 树突状基质为DNA提供了较高的表面积和结合能力,超过了裸体DNA的结合能力.
  • 基于DNA的系统表现出增强的稳定性,能够承受超过170个冷化/再循环,并预测长半衰期 (在4°C下约6,000年).
  • 数据可以被删除和替换,RNA转录成功地被测序并用于酶计算 (例如,解决简化的象棋和sudoku).

结论:

  • 已经建立了一个可行的基于DNA的存储和计算引擎.
  • 开发的系统利用了高信息密度和核酸的并行计算.
  • 这项工作通过实现关键原始能力,推动了分子信息技术的发展.