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Electron Carriers01:24

Electron Carriers

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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...
84.5K
Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
98.3K
Electron Affinity03:07

Electron Affinity

35.5K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
35.5K
The Electron Transport Chain01:30

The Electron Transport Chain

16.7K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
16.7K
Electron Configurations02:46

Electron Configurations

16.6K
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
16.6K
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

13.2K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
13.2K

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Video Experimental Relacionado

Updated: Jul 1, 2025

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
07:50

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

11.0K

Las autopistas de electrones son más frías.

Navita Jakhar1, Maria Ibáñez1

  • 1Institute of Science and Technology Austria, Klosterneuburg, Austria.

Science (New York, N.Y.)
|March 14, 2024
PubMed
Resumen

La reducción de defectos mejora significativamente el rendimiento a temperatura ambiente de los dispositivos termoeléctricos. Esta mejora es clave para aplicaciones eficientes de conversión de energía.

Área de la Ciencia:

  • Ciencias de los materiales
  • Física del estado sólido
  • Conversión de energía

Sus antecedentes:

  • Los dispositivos termoeléctricos convierten la energía térmica en energía eléctrica y viceversa.
  • El rendimiento del dispositivo a menudo está limitado por defectos materiales.
  • La optimización de los materiales termoeléctricos para el funcionamiento a temperatura ambiente es crucial para aplicaciones generalizadas.

Objetivo del estudio:

  • Investigar el impacto de la reducción de defectos en el rendimiento del dispositivo termoeléctrico a temperatura ambiente.
  • Identificar estrategias para minimizar los defectos en los materiales termoeléctricos.

Principales métodos:

  • Fabricación de dispositivos termoeléctricos con diferentes concentraciones de defectos.
  • Caracterización de las propiedades del material, incluida la conductividad eléctrica, el coeficiente de Seebeck y la conductividad térmica.

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  • Pruebas de rendimiento de los dispositivos a temperatura ambiente.

    • Principales resultados:

    • Se observó una clara correlación entre la reducción de la densidad de los defectos y la mejora del rendimiento termoeléctrico.
    • Los dispositivos con menos defectos exhibieron una mayor potencia de salida y eficiencia de conversión.
    • Se encontró que las técnicas específicas de ingeniería de defectos eran efectivas.

    Conclusiones:

    • Minimizar los defectos es un factor crítico para mejorar el rendimiento del dispositivo termoeléctrico a temperatura ambiente.
    • Las estrategias de reducción de defectos ofrecen una vía prometedora para desarrollar generadores y refrigeradores termoeléctricos más eficientes.