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相关概念视频

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.
 
Most enzymes...
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Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Protein Absorption01:12

Protein Absorption

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Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
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Lipid Absorption01:24

Lipid Absorption

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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Carbohydrate Absorption01:25

Carbohydrate Absorption

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Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
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相关实验视频

Updated: Jan 31, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

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脱对称的元材料可以实现完美的吸收.

Weijia Luo1,2, Runni Zhao1, Yueyang Liu3

  • 1State Key Laboratory of New Ceramic Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, China.

Advanced materials (Deerfield Beach, Fla.)
|January 30, 2026
PubMed
概括

这项研究引入了一种全新的全陶超材料,它使用单点打破对称性,增强热耐受性. 这种设计通过抑制散射,扩大功能超材料的可能性来实现近乎完美的吸收和横向波传播.

关键词:
所有陶元材料的全陶元材料.极端的环境耐受性极端的环境耐受性一般化的Kerker效应奇点 奇点 奇点 奇点对称性打破 破坏对称性

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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 电磁主义 电磁主义

背景情况:

  • 超材料通过对称性破坏来操纵物理场.
  • 传统设计需要复杂的结构,在极端条件下限制可靠性.

研究的目的:

  • 引入一个非对称的全陶元材料设计.
  • 为了放松超材料中传统对称性操纵的约束.
  • 为了提高耐热性和可靠性.

主要方法:

  • 受一般化的Kerker效应的启发,单点被引入到一个全陶元材料中.
  • 反对称性破坏仅限于单个结构元素.
  • 在陶板上的可变盲孔几何学建立了D4v对称性.
  • 使用了连续性 (BIC) 中受约束状态的理论框架.

主要成果:

  • 该设计实现了对偶数和奇数模式及其干扰的精确操纵.
  • 产生了一个单一的模式,抑制了前向和后向散射.
  • 实现了近侧电磁波传播和外部近完美的吸收.
  • 陶的内在点决定了耐热度.

结论:

  • 从严格的对称性要求中解开广义化的Kerker效应,扩大了元材料设计空间.
  • 这种新的架构提供了增强的应用潜力,因为它具有自我支的性质和极化敏感性.
  • 这一战略促进了具有独特电磁性质的先进设备的开发.