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

Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

1.3K
γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for...
1.3K
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

17.6K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.6K
Facilitated Transport01:19

Facilitated Transport

146.6K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
146.6K
C4 Pathway and CAM01:27

C4 Pathway and CAM

48.9K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
48.9K
Primary Active Transport01:47

Primary Active Transport

197.0K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
197.0K
Secondary Active Transport01:55

Secondary Active Transport

137.4K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
137.4K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Fundamentals, Measurement and Regulation of the Conductance of Single Molecule Junctions.

Angewandte Chemie (International ed. in English)·2026
Same author

Microscopic Characteristics of Acetonitrile-Water Mixtures on α-Al<sub>2</sub>O<sub>3</sub>(0001) Surface: A Combined Experimental and Theoretical Study.

The journal of physical chemistry letters·2026
Same author

Near-infrared vibrational second harmonic generation: a new nonlinear interfacial vibrational spectroscopy.

Faraday discussions·2026
Same author

Local Spin Density Approximation Strongly Improved by a Better-Informed Local Scaling of Its Self-Interaction Correction.

Journal of chemical theory and computation·2026
Same author

Determining the Dielectric Constant of Solid-Liquid Interfaces.

Physical review letters·2026
Same author

The vibrational relaxation of a charged solute probes the vibrational density of states at oxide/water interfaces.

The Journal of chemical physics·2026

Video Experimental Relacionado

Updated: Jan 22, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

13.8K

Caminos de transporte de alta conductividad inducidos por potencial a través de uniones de una sola molécula

Parisa Yasini, Sepideh Afsari, Haowei Peng

    Journal of the American Chemical Society
    |June 28, 2019
    PubMed
    Resumen

    El control de la orientación de la molécula con el potencial del electrodo permite uniones de una sola molécula altamente conductivas. Este avance en la electrónica molecular mejora significativamente la conductividad en comparación con los métodos tradicionales, allanando el camino para dispositivos miniaturizados.

    Más Videos Relacionados

    A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
    12:05

    A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

    Published on: October 1, 2017

    8.6K
    A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
    07:47

    A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters

    Published on: April 20, 2015

    10.3K

    Videos de Experimentos Relacionados

    Last Updated: Jan 22, 2026

    Single-Molecule Imaging of Nuclear Transport
    12:13

    Single-Molecule Imaging of Nuclear Transport

    Published on: June 9, 2010

    13.8K
    A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
    12:05

    A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

    Published on: October 1, 2017

    8.6K
    A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
    07:47

    A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters

    Published on: April 20, 2015

    10.3K

    Área de la Ciencia:

    • La electrónica molecular
    • Nanotecnología
    • Ciencias de la superficie

    Sus antecedentes:

    • Las moléculas individuales ofrecen potencial para la miniaturización de dispositivos electrónicos.
    • El control de la orientación molecular es crucial para optimizar las propiedades electrónicas.

    Objetivo del estudio:

    • Investigar la formación de uniones de una sola molécula con orientación molecular controlada externamente.
    • Para medir y comparar la conductividad de las moléculas de ácido tetrafluorotereftálico (TFTPA) y ácido tereftálico (TPA) bajo diferentes potenciales de electrodo.

    Principales métodos:

    • Utilizando la técnica de unión de ruptura de microscopía de túnel de barrido (STM-BJ).
    • Utilizando el cálculo de la función de Green de no equilibrio de los primeros principios (NEGF).
    • Medición experimental de la conductividad de una sola molécula.

    Principales resultados:

    • Una superestructura molecular altamente ordenada y orientada plana se forma en potenciales negativos de electrodo, lo que permite el contacto directo π-electrodo.
    • Las uniones orientadas a plano exhiben una conductividad 3 órdenes de magnitud más alta que las moléculas conectadas verticalmente.
    • Las conductancias experimentalmente medidas para el TFTPA plano y el TPA son 0,24 ± 0,04 G0 y 0,22 ± 0,02 G0, respectivamente.
    • Los potenciales de electrodo positivos interrumpen la estructura ordenada, eliminando los estados de alta conductividad.

    Conclusiones:

    • El control externo de la orientación molecular a través del potencial del electrodo es una estrategia viable para formar uniones de una sola molécula altamente conductoras.
    • Las uniones moleculares orientadas a plano superan significativamente a las conectadas a través de grupos de anclaje.
    • La dependencia de conductividad observada en el potencial del electrodo sugiere un mecanismo de transporte mediado por LUMO.