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

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.2K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
49.2K
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

797
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
797
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

814
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
814
Alternative RNA Splicing02:18

Alternative RNA Splicing

25.2K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
25.2K
Null and Alternative Hypotheses01:16

Null and Alternative Hypotheses

12.8K
The actual hypothesis testing begins by considering two hypotheses. They are termed  the null hypothesis and the alternative hypothesis. These hypotheses contain opposing viewpoints.
The null hypothesis, denoted by H0 is a statement of no difference between the variables—they are not related. This can often be considered the status quo. As  a result if you cannot accept the null, it requires some action.
The alternative hypothesis, denoted by H1 or Ha, is a claim about the...
12.8K
Electron Carriers01:24

Electron Carriers

91.9K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
91.9K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

4,4'- and 2,4'-Bis(olympicenyl)s: Antiferromagnetically Coupled Diradicals with Twisted Conformations.

Organic letters·2026
Same author

Aethrene: A Stable Polycyclic Aromatic Hydrocarbon With a Triplet Ground State.

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

Molecular Nanocarbons with Diverse Connectivity and Topologies Enabled by Bismuth(III) Triflate-Mediated Benzannulation Reaction.

Accounts of chemical research·2026
Same author

π-Aggregation-free, fused perylene pentamers: synthesis, narrowband far-red to near-infrared emission, and chiroptical properties.

Chemical science·2026
Same author

A C<sub>2</sub>-Symmetric Chiral Emitter for Deep-Blue Circularly Polarized Electroluminescence With High Dissymmetry Factors.

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

Biradical-mediated synergistic electrocatalysis using metal-free redox molecular catalysts.

Nature communications·2025
Same journal

A Domino-Synthesized Dicoordinate Copper(I) Bis-imidazopyridine Complex Triggering Cuproptosis/Ferroptosis for Enhanced Cancer Immunotherapy.

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

Mirror-Symmetric Organic Two-Dimensional Crystals for Alternative Photon Transport Pathways.

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

Cobalt-Catalyzed Migratory E-Selective Asymmetric Aza-Nozaki-Hiyama-Kishi Coupling.

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

Facile Synthesis of α,ω-Dihydroxy Telechelic Macromonomers From Ethylene and α-Olefins for Recyclable Alternating Block Copolymers.

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

Multi-Atom Sub-Nanometer Assemblies on Interpenetrating Multi-Chambered N/C Nanospheres.

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

A Synergistic C<sub>2+</sub> Alcohols/Olefins-Intermediated Pathway Boosts CO<sub>2</sub> Hydrogenation to Aromatics.

Angewandte Chemie (International ed. in English)·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Feb 6, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
12:48

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Published on: February 19, 2013

11.1K

Rilenos alternativamente retorcidos y ricos en electrones y sus cationes estables

Zhitao Sun1, Rui Liu1, Wei Fan1

  • 1Department of Chemistry, National University of Singapore, Singapore.

Angewandte Chemie (International ed. in English)
|February 4, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Se logró la síntesis de moléculas de rileno largas, que típicamente se agregan, mediante la introducción de torsiones en la cadena principal. Este método produce moléculas con propiedades ópticas sintonizables y comportamientos electrónicos únicos, allanando el camino para nuevos materiales.

Palabras clave:
Sistemas π ricos en electronesNanocinta de grafenoCatión radicalRilenoMolécula retorcida

Más Videos Relacionados

Syringe-injectable Mesh Electronics for Stable Chronic Rodent Electrophysiology
09:58

Syringe-injectable Mesh Electronics for Stable Chronic Rodent Electrophysiology

Published on: July 21, 2018

24.0K
Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.9K

Videos de Experimentos Relacionados

Last Updated: Feb 6, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
12:48

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Published on: February 19, 2013

11.1K
Syringe-injectable Mesh Electronics for Stable Chronic Rodent Electrophysiology
09:58

Syringe-injectable Mesh Electronics for Stable Chronic Rodent Electrophysiology

Published on: July 21, 2018

24.0K
Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.9K

Área de la Ciencia:

  • Química Orgánica
  • Ciencia de Materiales
  • Química Supramolecular

Sus antecedentes:

  • La síntesis en fase de solución de rilenos largos es difícil debido a la agregación.
  • La torsión de la cadena principal puede mitigar la agregación e introducir quiralidad.

Objetivo del estudio:

  • Sintetizar moléculas de rileno largas y novedosas con agregación reducida.
  • Investigar el impacto de la torsión de la cadena principal y los sustituyentes en las propiedades moleculares.

Principales métodos:

  • Reacciones de acoplamiento cruzado paso a paso.
  • Deshidrogenación oxidativa controlada.
  • Cristalografía de rayos X, RMN de 1H y análisis ACID.

Principales resultados:

  • Se sintetizaron con éxito moléculas de rileno hasta octarileno con cadenas principales retorcidas y sustituyentes n-butoxi.
  • Se observó helicidad P/M alternante en rilenos con múltiples motivos tetra(n-butoxi).
  • Se demostraron propiedades ópticas dependientes de la longitud (visible a NIR) y formación fácil de cationes radicales/dicaciones.
  • Se reveló la evolución de la aromaticidad local a global en dicaciones.

Conclusiones:

  • La estrategia sintética desarrollada supera eficazmente los desafíos de agregación en la síntesis de rilenos largos.
  • Las estructuras de rileno retorcidas exhiben conformaciones helicoidales únicas y propiedades optoelectrónicas sintonizables.
  • La naturaleza rica en electrones y la estabilidad de sus formas oxidadas son prometedoras para aplicaciones electrónicas.