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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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CO2をエタノールに還元する

Yuguang C Li1, Ziyun Wang1, Tiange Yuan2

  • 1Department of Electrical and Computer Engineering , University of Toronto , 35 St. George Street , Toronto , Ontario M5S 1A4 , Canada.

Journal of the American Chemical Society
|May 10, 2019
PubMed
まとめ

研究者は,炭素二酸化物 (CO2) の電気化学的減少のための新しい銀銅 (Ag/Cu) 触媒を開発しました. この触媒はエタノール生産の選択性を大幅に高め この貴重な化学物質の効率を記録しました

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科学分野:

  • 電気化学
  • キャタリシス
  • 材料科学

背景:

  • 二酸化炭素 (CO2) の電気化学的減少は,貴重な化学物質の生産に不可欠です.
  • 現在の触媒はエタノールよりもエチレンを好み,エタノールの工業的活力を制限する.
  • エタノール生産のための選択的触媒の開発は依然として大きな課題です.

研究 の 目的:

  • 二酸化炭素の電気還元におけるエタノールの選択性を高めるため
  • エチレンよりもエタノール形成を促進する触媒を設計する.
  • CO2削減のための多金属触媒の設計の枠組みを確立する.

主な方法:

  • 二金属銀銅 (Ag/Cu) 触媒の開発
  • 触媒表面の様々な結合部位を利用する.
  • 触媒の振る舞いを分析するために,局所ラマンスペクトロスコーピーを用いる.
  • 250mA/cm2で電気化学試験を行い, -0.67VとRHEを比較する.

主要な成果:

  • エタノール生産の41%のファラダイク効率を達成しました.
  • カソッド側で 24.7% のエネルギー効率を証明した.
  • 多様な結合構成を示す 局所的なラマンスペクトルの拡大を観測した.

結論:

  • Ag/Cu触媒の様々な結合部位は,エチレン中間物質を不安定化し,エタノール生産を促進する.
  • 双金属触媒の設計は,高度に選択的なエタノール合成への有望な経路を提供します.
  • マルチサイト結合は,CO2の電還元のための高度な触媒の設計のための枠組みを提供します.