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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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揭示了二氧化碳的存在.

Jeongjin Kim1,2, Youngseok Yu3,4, Tae Won Go1

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.

Nature communications
|June 6, 2023
PubMed
概括
此摘要是机器生成的。

铜纳米晶可促进二氧化碳 (CO2) 的激活. 这项研究揭示了二氧化碳分离如何重组铜,影响二氧化碳转化和可再生能源催化剂设计.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学
  • 催化剂是一种催化剂.

背景情况:

  • 具有邻近平面的定制铜 (Cu) 纳米晶体是二氧化碳 (CO2) 激活的关键.
  • 二氧化碳转化效率与邻近Cu接口的特定形态之间的直接联系仍然未确立.

研究的目的:

  • 为了研究在二氧化碳暴露下Cu纳米集群结构的演变.
  • 为了确定二氧化碳转化和Cu纳米晶体的形态变化之间的相关性.

主要方法:

  • 环境压力扫描道显微镜 (AP-STM) 用于观察Cu (997) 表面上的纳米集群演变.
  • 基于同步子的环境压力X射线光电子光谱 (AP-XPS) 来分析化学结合能.

主要成果:

  • 在Cu阶段边缘的二氧化碳解离产生CO和O,诱导Cu原子重组.
  • 结合CO导致可逆的Cu聚类,而O导致不可逆的Cu分层.
  • AP-XPS证实了CO-Cu复合物的形成,验证了实时空间观测.

结论:

  • 在现场的观测提供了现实的见解Cu纳米催化剂在CO2下的行为.
  • 了解这些重组过程对于设计高效的Cu催化剂,用于C1化学和可再生能源应用中的CO2转化至关重要.