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

Measuring Reaction Rates03:09

Measuring Reaction Rates

28.5K
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
28.5K
Factors Influencing the Rate of Chemical Reactions01:22

Factors Influencing the Rate of Chemical Reactions

7.8K
A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another....
7.8K
Concentration and Rate Law03:03

Concentration and Rate Law

37.4K
The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:
37.4K
Reaction Rate02:53

Reaction Rate

61.9K
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
61.9K
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

4.9K
The Arrhenius equation,
4.9K
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

88.3K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
88.3K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Global trends in human birth and death seasonality reveal climate-related shifts in reproductive timing.

bioRxiv : the preprint server for biology·2026
Same author

Geometrical compartmentalization of trigger waves.

Proceedings of the National Academy of Sciences of the United States of America·2025
Same author

Mechanistic origins of temperature scaling in the early embryonic cell cycle.

Nature communications·2025
Same author

Mouse lemur cell atlas informs primate genes, physiology and disease.

Nature·2025
Same author

A molecular cell atlas of mouse lemur, an emerging model primate.

Nature·2025
Same author

Change of venue: fission-yeast cell-division cues actually initiate in the nucleus.

Nature·2025
Same journal

Thyroid cancer-associated EZH1 Q571R mutation drives chromatin compaction and H3K27me3 invasion into active chromatin.

Molecular cell·2026
Same journal

Genome-wide rotational and translational phasing of nucleosomes with human transcription factors.

Molecular cell·2026
Same journal

Spliceosomal proofreading factors safeguard 3' splice-site fidelity and prevent proteotoxicity and inflammation.

Molecular cell·2026
Same journal

Cytosolic EZH2-IMPDH2 complexes regulate melanoma progression and metastasis via GTP.

Molecular cell·2026
Same journal

A bacterial reverse transcriptase: Protein-templated DNA synthesis fuels antiviral immunity.

Molecular cell·2026
Same journal

Tweezing apart ribosome heterogeneity.

Molecular cell·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Jan 7, 2026

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
10:43

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Published on: July 19, 2022

2.8K

¿Cómo afecta el hacinamiento citoplasmático a las velocidades de reacción?

Jo-Hsi Huang1, James E Ferrell2

  • 1Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Molecular cell
|December 31, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El hacinamiento celular generalmente ralentiza las reacciones bioquímicas debido a la reducción de la difusión, lo que afecta la dinámica citoplasmática. Este hallazgo tiene implicaciones para la comprensión de los procesos celulares y las interacciones moleculares dentro de la célula.

Palabras clave:
ley de Philliesdifusiónvolumen excluidobioquímica in vivohacinamiento molecularconstantes de velocidadteoría de partículas escaladas

Más Videos Relacionados

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

8.7K
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

9.3K

Videos de Experimentos Relacionados

Last Updated: Jan 7, 2026

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
10:43

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Published on: July 19, 2022

2.8K
Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

8.7K
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

9.3K

Área de la Ciencia:

  • Biología Celular
  • Bioquímica
  • Biofísica

Sus antecedentes:

  • El citoplasma eucariota está densamente empaquetado con macromoléculas.
  • El hacinamiento macromolecular puede influir en las velocidades de reacción bioquímica.
  • Los modelos teóricos proponen efectos positivos y negativos del hacinamiento.

Objetivo del estudio:

  • Revisar las teorías que explican los efectos del hacinamiento en las velocidades de reacción.
  • Examinar la evidencia experimental que mide estos efectos in vivo.
  • Evaluar el impacto del hacinamiento en la dinámica bioquímica citoplasmática.

Principales métodos:

  • Revisión de la literatura de modelos teóricos.
  • Encuesta de estudios experimentales que utilizan extractos celulares y células vivas.
  • Análisis de constantes de velocidad efectivas de segundo orden.

Principales resultados:

  • El hacinamiento generalmente disminuye las constantes de velocidad efectivas de segundo orden.
  • El principal mecanismo para esta disminución es la ralentización de la difusión.
  • La evidencia experimental sugiere una tendencia consistente en varias reacciones.

Conclusiones:

  • El hacinamiento macromolecular en el citoplasma a menudo ralentiza las reacciones bioquímicas.
  • La difusión reducida es un factor clave en esta reducción de la velocidad.
  • Los hallazgos exigen una reevaluación de la dinámica bioquímica citoplasmática y las compensaciones.