在DNA组装的银纳米集群中的等离子合
Qiong Wu1, Chengcheng Liu1, Cheng Cui1,2
1Center for Research at Bio/Nano Interface, Department of Chemistry and Department of Physiology and Functional Genomics, UF Health Cancer Center, UF Genetics Institute and McKnight Brain Institute, University of Florida, Gainesville, Florida 32611-7200, United States.
Journal of the American Chemical Society
|August 31, 2021
概括
量子大小的金属集群,如DNA-银纳米集群 (DNA-AgNCs),可以显示出等离子体合. 这项研究提供了组装DNA-AgNC中的等离子合的实验证据,为新的等离子器件打开了大门.
科学领域:
- *等离子学和纳米光学
- * 量子点和纳米集群科学
- * 超分子化学和纳米材料
背景情况:
- * 量子大小的金属团理论上支持集体等离子激发.
- * 对于少原子金属集群中的等离子合的实验证据很少.
- *DNA模板银纳米集群 (DNA-AgNCs) 提供了一个可控组装的平台.
研究的目的:
- * 在组装的DNA-AgNC中研究等离子体合.
- * 探索DNA-AgNC的光学吸收特性作为组装距离的函数.
- * 确定DNA-AgNCs在等离子体合应用中的潜力.
主要方法:
- * 合成DNA模板的Ag纳米集群 (DNA-AgNCs).
- *通过DNA杂交来组装DNA-AgNC,以控制集群间的距离.
- * 光学吸收光谱分析组装时的光谱变化.
- * 时间依赖密度函数理论 (TDDFT) 模拟以了解吸收机制和电场增强.
主要成果:
- * 组装的DNA-AgNC的光学吸收峰值对集群间距离表现出敏感性,这是等离子合的特征.
- 由于二极电荷分布和多重转换,TDDFT模拟证实了个别DNA- AgNC的吸收源.
- * 实验和模拟结果显示了一致的峰值转移趋势,表明组装的DNA-AgNC之间存在等离子体合.
结论:
- * 量子大小的结构,特别是DNA-AgNCs,可以支持等离子体合.
- * DNA-AgNC 具有作为超小,特定位置和生物相容等离子体合器件的构建块的潜力.
- 这些发现有助于我们更好地理解纳米系统中的等离子体现象及其设备应用.
相关概念视频
Genomic DNA in Eukaryotes
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.
DNA Packaging
Overview
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In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...


