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相关概念视频

Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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Gene Conversion02:08

Gene Conversion

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Gene Conversion02:08

Gene Conversion

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Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Conversion of Units01:36

Conversion of Units

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Sometimes, there is a need to convert from one unit to another one. For instance, reading a cookbook in which quantities are expressed in units of liters or ounces may require conversion of quantities to cups. Or, when looking up directions on how to get to a location, we may be interested to know how many miles we are going to walk. In this case, we would have to convert units of feet or meters to miles.
The first step in the unit conversion is to list the given units and the units required...
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5-Number Summary01:04

5-Number Summary

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In a dataset, the 5-number summary includes the minimum data value, the data value of the first quartile, the median data value or data value of the second quartile, the data value of the third quartile, and the maximum data value. These 5 data values can be visualized as a box and whisker plot.
In a box plot, the minimum and maximum data values represent the lower and upper whiskers in the graph, and the median is designated as the center of the box in the chart. The first quartile and third...
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相关实验视频

Updated: Feb 1, 2026

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
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低于5纳米的Cu集群为高效的CO2-to-C2H4转换:协同微结构和催化微环境.

Tianlong Tan1, Hai Liu2, Wenlong Cao1

  • 1School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.

ACS applied materials & interfaces
|January 31, 2026
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概括

这项研究开发了先进的铜集群催化剂,用于高效的电化学二氧化碳减少 (CO2RR) 到乙烯. 这些催化剂在性电解质中实现了高选择性和高性能,推进了碳中和目标.

关键词:
C2+产品的产品是C2+产品集群集群是指一个集群的集群.铜铜 铜铜的铜.电催化剂是一种电催化剂.电化学二氧化碳减排方法微观结构的微观结构

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科学领域:

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

背景情况:

  • 电化学二氧化碳减排 (CO2RR) 是碳中和的关键,但在酸性介质中面临进化的挑战.
  • 性电解质有利于形成多碳产品,如乙烯 (C2H4),而不是副作用反应.

研究的目的:

  • 制造和研究用于选择性CO2RR到C2H4.4.的表面载荷铜集群催化剂 (<5nm).
  • 了解催化剂微结构和微环境对CO2RR性能的影响.

主要方法:

  • 使用磁铁喷射,惰性气体凝聚和集束束沉积制造铜集群催化剂.
  • 使用1M KOH电解质在流电池中进行电化学评估.
  • 有限元模拟和现场拉曼光谱用于机械洞察力.

主要成果:

  • 在广泛的电流密度范围 (50180 mA cm-2) 上, CO2 转化为 C2H4 的法拉第效率 (FE) 超过 50%.
  • 与原始Cu/PTFE相比,优化的Cu集群催化剂显示出增强的FE C2H4和更广泛的有效电流密度.
  • 通过模拟和光谱学确定了接口物种 (*CO,OH-,K+) 之间的协同作用.

结论:

  • 通过纳米结构设计来调节催化界面的总体策略被提出.
  • 这种方法为选择性二氧化碳转化为乙烯提供了一个有希望的途径.
  • 先进的铜集聚催化剂显著提高了CO2RR的效率和选择性.