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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...
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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.
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The Intermediate Value Theorem is a foundational result in calculus that guarantees the existence of solutions within certain intervals for continuous functions. Formally, the Intermediate Value Theorem states that if a function f is continuous on the closed interval [a, b], and if N is any value between f(a) and f(b), then there exists at least one c ∈ (a, b) such that f(c) = N. This theorem is instrumental in proving the existence of roots and in analyzing the behavior of continuous...
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Los estados intermedios dirigieron la transferencia quiral en una superficie plateada

Biao Yang1, Nan Cao1, Huanxin Ju2

  • 1Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials a Devices , Soochow University , 199 Ren'ai Road , Suzhou 215123 , P. R. China.

Journal of the American Chemical Society
|November 27, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio demuestra un nuevo método para la transferencia quiral 2D utilizando intermedios metal-orgánicos en una superficie plateada. La quiralidad se transfiere con éxito de los estados intermedios a los productos diméricos finales.

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Área de la Ciencia:

  • Química de las superficies
  • Síntesis de quiral
  • Química supramolecular

Sus antecedentes:

  • La síntesis quiral en superficies es un campo en crecimiento.
  • El control de la quiralidad en estructuras ensambladas en superficie es un desafío.

Objetivo del estudio:

  • Para desarrollar un nuevo método de transferencia quiral 2D.
  • Investigar la inducción quiral a través de intermedios orgánicos metálicos en las superficies.

Principales métodos:

  • Autoensamblaje de las moléculas acirales en la superficie de Ag{100}.
  • El recocido controlado para formar híbridos quirales metal-orgánicos.
  • Cálculos de la Teoría Funcional de la Densidad (DFT).
  • Espectroscopia de fotoelectrones de rayos X basado en sincrotrones (XPS).

Principales resultados:

  • El achiral 4,4'-dihidroxibifenilo formó redes 2D.
  • Intermedios de tetrámeros quirales inducidos por recocido.
  • La quiralidad se transfiere de los tetrámeros a los productos de dímeros.
  • Las islas enantioméricas se formaron en la superficie plateada.

Conclusiones:

  • Demostró un nuevo mecanismo de transferencia quiral 2D.
  • Los metales orgánicos intermedios son la clave para la inducción quiral.
  • Las reacciones mediadas por la superficie pueden controlar eficazmente la quiralidad.