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

The Carbon Cycle01:14

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
Phase Diagrams02:39

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
A Single-Component System01:24

A Single-Component System

In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
Conservation of Mass in Finite Cotrol Volume01:16

Conservation of Mass in Finite Cotrol Volume

The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Electrocatalytic proton-reduction behaviour of telluride-capped triiron clusters: tuning of overpotentials and stabilization of redox states relative to lighter chalcogenide analogues.

Dalton transactions (Cambridge, England : 2003)·2020
Same author

Negative Ion Photoelectron Spectroscopy Confirms the Prediction of a Singlet Ground State for the 1,8-Naphthoquinone Diradical.

The journal of physical chemistry. A·2019
Same author

Hydrogenase biomimics containing redox-active ligands: Fe<sub>2</sub>(CO)<sub>4</sub>(μ-edt)(κ<sup>2</sup>-bpcd) with electron-acceptor 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) as a potential [Fe<sub>4</sub>-S<sub>4</sub>]<sub>H</sub> surrogate.

Dalton transactions (Cambridge, England : 2003)·2019
Same author

Calculations on 1,8-naphthoquinone predict that the ground state of this diradical is a singlet.

Journal of computational chemistry·2018
Same author

Negative ion photoelectron spectroscopy of P<sub>2</sub>N<sub>3</sub><sup>-</sup>: electron affinity and electronic structures of P<sub>2</sub>N<sub>3</sub>˙.

Chemical science·2018
Same author

A new diphosphine-carbonyl complex of ruthenium: an efficient precursor for C-C and C-N bond coupling catalysis.

Dalton transactions (Cambridge, England : 2003)·2018

Video Experimental Relacionado

Updated: Jun 28, 2026

Scanning-probe Single-electron Capacitance Spectroscopy
10:53

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Túneles de carbono desde un solo estado cuántico.

Peter S Zuev1, Robert S Sheridan, Titus V Albu

  • 1Department of Chemistry 216, University of Nevada, Reno, NV 89557, USA.

Science (New York, N.Y.)
|February 8, 2003
PubMed
Resumen

El túnel de carbono impulsa la expansión del anillo de 1-metilciclobutilfluorocarbeno a bajas temperaturas. Este efecto cuántico domina significativamente la velocidad de reacción, incluso a 8 Kelvin.

Más Videos Relacionados

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
11:19

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

Published on: October 21, 2016

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Videos de Experimentos Relacionados

Last Updated: Jun 28, 2026

Scanning-probe Single-electron Capacitance Spectroscopy
10:53

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
11:19

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

Published on: October 21, 2016

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Área de la Ciencia:

  • Química Física es la química física.
  • La mecánica cuántica es la mecánica cuántica.
  • La cinética química es la cinética química.

Sus antecedentes:

  • Las reacciones de carbenos son fundamentales en la química orgánica.
  • El túnel cuántico puede influir significativamente en las tasas de reacción a bajas temperaturas.
  • La comprensión de la dinámica de reacción a baja temperatura es crucial para varios procesos químicos.

Objetivo del estudio:

  • Para investigar el mecanismo de expansión del anillo del 1-metilciclobutilfluorocarbeno a 8 Kelvin.
  • Para cuantificar el papel del túnel de carbono en esta reacción.
  • Para explorar la influencia de las matrices de gases inertes en las velocidades de reacción.

Principales métodos:

  • Observaciones experimentales de baja temperatura a 8 Kelvin.
  • Medidas cinéticas de la expansión del anillo de carbeno en matrices de nitrógeno y argón.
  • Cálculos computacionales para determinar las vías y contribuciones de reacción.

Principales resultados:

  • Se observó la expansión del anillo de 1-metilciclobutilfluorocarbeno.
  • Las constantes de velocidad medidas de 4.0 x 10(-6) s−1 en nitrógeno y 4 x 10(-5) s−1 en argón.
  • Los cálculos mostraron que la contribución del túnel es 152 órdenes de magnitud mayor que el paso de la barrera.

Conclusiones:

  • El túnel de carbono es el mecanismo dominante para esta reacción a 8 Kelvin.
  • La reacción procede de un solo estado cuántico, lo que lleva a una velocidad independiente de la temperatura.
  • El entorno de la matriz de gas inerte circundante afecta la velocidad de reacción.