Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Free-falling Bodies: Introduction01:07

Free-falling Bodies: Introduction

All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
Free-falling Bodies: Example01:05

Free-falling Bodies: Example

An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
Finding the Center of Gravity01:03

Finding the Center of Gravity

The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate is...
Composite Bodies00:55

Composite Bodies

A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
Composite bodies have widespread applications in mechanical engineering, from automobiles to aircraft to rockets. For example, an automobile wheel comprises...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Molecular Recognition within a Self-Assembled Cylindrical Host.

Angewandte Chemie (International ed. in English)·2014
Same author

Extended covalent containers: synthesis and guest encapsulation.

Chemical communications (Cambridge, England)·2013
Same author

Convergent functional groups provide a measure of stereoelectronic effects at carboxyl oxygen.

Journal of the American Chemical Society·2011
Same author

Effect of galnon on induction of long-term potentiation in dentate gyrus of C57BL/6 mice.

Neuropeptides·2005
Same author

Reversible encapsulation of multiple, neutral guests in hexameric resorcinarene hosts.

Chemical communications (Cambridge, England)·2002
Same author

Hydrogen-bonded capsules in polar, protic solvents.

Chemical communications (Cambridge, England)·2002

Video Experimental Relacionado

Updated: Jul 17, 2026

3D Whole-heart Myocardial Tissue Analysis
06:53

3D Whole-heart Myocardial Tissue Analysis

Published on: April 12, 2017

Cavit y las porfirinas.

S D Starnes1, D M Rudkevich, J Rebek

  • 1The Skaggs Institute for Chemical Biology and The Department of Chemistry, The Scripps Research Institute, MB-26, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|July 18, 2001
PubMed
Resumen

Las nuevas moléculas de contenedores a nanoescala, híbridos de cavitandos y metaloporfirinas, exhiben altas afinidades de unión al huésped. Estos huéspedes cinéticamente estables permiten la unión selectiva del huésped y el potencial para reacciones catalizadas por metales.

Más Videos Relacionados

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice
10:28

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice

Published on: May 24, 2018

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
10:23

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

Published on: September 8, 2023

Videos de Experimentos Relacionados

Last Updated: Jul 17, 2026

3D Whole-heart Myocardial Tissue Analysis
06:53

3D Whole-heart Myocardial Tissue Analysis

Published on: April 12, 2017

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice
10:28

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice

Published on: May 24, 2018

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
10:23

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

Published on: September 8, 2023

Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Química orgánica es la química orgánica.

Sus antecedentes:

  • Los cavitandos son anfitriones moleculares capaces de encapsular las moléculas invitadas.
  • Las metaloporfirinas son macrociclos versátiles con aplicaciones en catálisis y detección.
  • El diseño de arquitecturas moleculares complejas requiere un control preciso sobre el autoensamblaje y el enlace covalente.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevas moléculas de contenedores a nanoescala (7 y 8) que integran cavitandos y metaloporfirinas.
  • Para investigar las propiedades de unión al huésped y la estabilidad de estos nuevos contenedores moleculares.
  • Explorar el potencial de estos contenedores para el reconocimiento selectivo de huéspedes y la catálisis.

Principales métodos:

  • Síntesis covalente de híbridos de cavitán y metaloporfirina.
  • Caracterización mediante espectroscopia UV/Vis y 1H RMN.
  • Estudios de vinculación con huéspedes que contienen adamantilo y piridil.

Principales resultados:

  • Síntesis exitosa de contenedores a nanoescala 7 y 8 con dimensiones de hasta 10 x 25 A.
  • Altas afinidades de unión para los huéspedes, con contribuciones tanto de la cavidad y las cavidades como de las paredes de metaloporfirina.
  • Los complejos cinéticamente estables se forman debido a los enlaces de hidrógeno intramoleculares, resistiendo el intercambio de invitados.
  • Se ha demostrado la selección de huéspedes en pares por el contenedor 8, formando complejos termoleculares.

Conclusiones:

  • Los contenedores de nanoescala sintetizados representan arquitecturas supramoleculares avanzadas con capacidades de unión significativas.
  • La integración de los cavitandos y las metaloporfirinas conduce a una mejora de las interacciones huésped-huésped y la estabilidad cinética.
  • Estos contenedores moleculares son prometedores para aplicaciones en reconocimiento molecular, separación y catálisis.