Video Experimental Relacionado
Updated: May 8, 2026
09:09
Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Respuesta al comentario sobre las "películas epitaxiales de recubrimiento de espina"
Meagan V Kelso1, Naveen K Mahenderkar1, Qingzhi Chen2
1Department of Materials Science and Engineering and Graduate Center for Materials Research, Missouri University of Science and Technology, Rolla, MO 65409, USA.
Science (New York, N.Y.)
|September 14, 2019
Resumen
Este estudio aborda las afirmaciones sobre las películas con recubrimiento de espín, refutando la idea de que la intensidad de los rayos X de fondo indica granos orientados al azar. La evidencia sugiere que las películas no están orientadas al azar, al contrario de las afirmaciones anteriores.
Área de la Ciencia:
- Ciencias de los materiales
- La cristalografía
Sus antecedentes:
- Un estudio previo de Lu y Tang cuestionó la naturaleza epitaxial de las películas con recubrimiento de espín.
- Atribuyeron la intensidad de fondo en las figuras de polos de rayos X a granos orientados al azar.
Objetivo del estudio:
- Para refutar la afirmación de que las películas con recubrimiento de espín carecen de calidad epitaxial.
- Proporcionar pruebas contra la interpretación de la intensidad de fondo como granos orientados al azar.
Principales métodos:
- Análisis de los patrones de difracción de rayos X 2θ.
- Examen de las figuras de los polos de rayos X para las películas con recubrimiento de espín.
- Comparación de la intensidad de fondo con sustratos monocristalinos.
Principales resultados:
- No se encontró evidencia de granos orientados al azar en los patrones de rayos X de 2θ.
- La intensidad de fondo en las figuras de polo fue comparable a la de los sustratos monocristalinos.
- Este hallazgo contradice la suposición de granos orientados al azar.
Conclusiones:
- La interpretación de la intensidad de fondo en las figuras de rayos X por Lu y Tang es inconsistente con nuestros datos.
- Las películas con recubrimiento espinoso presentan características que no respaldan la afirmación de que no son epitaxiales debido a la orientación aleatoria del grano.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:35Asymmetric Lipid Bilayer
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
01:18Detergent Purification of Membrane Proteins
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
00:59COP Coated Vesicles
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of different...
01:32Pinching-off of Coated Vesicles
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
01:16Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
01:13Cell-matrix's Response to Mechanical Forces
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...