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相关概念视频

Chirality02:25

Chirality

24.0K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
24.0K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.6K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.6K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.5K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.5K
Prochirality02:05

Prochirality

4.0K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.0K
Chirality in Nature02:30

Chirality in Nature

14.0K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
14.0K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.2K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.2K

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相关实验视频

Updated: May 7, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

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通过选择性地将氨基酸与石表面结合,形成性形态的形成是表面步骤.

C A Orme1, A Noy, A Wierzbicki

  • 1Chemistry and Material Science Department, Lawrence Livermore National Laboratory, California 94551, USA. orme1@llnl.gov

Nature
|July 19, 2001
PubMed
概括

有机分子通过结合到特定位置来控制晶体形状,改变生长能量. 这项研究将立体化学识别与生物矿物化的热力学和动力学因素相协调.

科学领域:

  • 生物矿物化和晶体生长
  • 材料科学 材料科学 材料科学
  • 生物化学 生物化学

背景情况:

  • 生物利用具有精确控制性能的生物矿物和复合材料.
  • 已知和蛋白质会影响矿化过程.
  • 通过立体化学识别对有机分子影响的传统观点与机械结晶模型相冲突.

研究的目的:

  • 调和生物矿物化的立体化学识别和机械控制的看似不同的观点.
  • 为了研究性氨基酸在修改石晶体生长中的作用.
  • 了解有机分子如何在基本层面影响晶体形状.

主要方法:

  • 在现场原子力显微镜 (AFM) 观察石的生长.
  • 分子建模研究.分子建模研究.
  • 分析氨基酸与石晶体表面的异构特异性结合.

主要成果:

  • 奇拉氨基酸表现出对石阶段边缘部位具有最佳的几何和化学适配的对抗体特异性结合.
  • 这种结合改变了不断生长的晶体的自由能量.
  • 观察到石晶体形状的宏观变化是这些能量变化的直接结果.

结论:

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Calcium Carbonate Formation in the Presence of Biopolymeric Additives

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Calcium Carbonate Formation in the Presence of Biopolymeric Additives
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Calcium Carbonate Formation in the Presence of Biopolymeric Additives

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  • 有机分子介导的晶体修饰机制涉及立体化学识别和界面能量的变化.
  • 这项研究为有机分子如何控制生物矿物质形成提供了统一的机械学理解.
  • 这些发现突出了分子识别与生物矿物化中的热力学/动力学因素之间的相互作用.