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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
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Voltage01:13

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The movement of electrons in a conductor requires some form of energy or work, usually provided by an external force, like a battery. This force is called the electromotive force or voltage. The voltage between two points, referred to as points "a" and "b," in an electric circuit is the energy (or work) needed to move a unit charge from point "a" to point "b," and this relationship is expressed mathematically as
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Multiple Voltage Sources01:25

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Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel.
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In electrical circuits, resistors can be connected in series, sequentially linked one after the other. In a series configuration, the same current flows through each resistor. Ohm's law is a fundamental principle to understand the behavior of resistors in series. It expresses the voltage across these resistors in terms of the current and resistance.
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A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...
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Nodal analysis is a remarkably effective method used in electrical engineering to simplify the analysis of complex circuits, including those with dependent or independent voltage sources. Its strength lies in its systematic approach to breaking down circuits into manageable components, making it easier for engineers to understand and solve.
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Video Experimental Relacionado

Updated: Feb 15, 2026

A Rhodopsin Transport Assay by High-Content Imaging Analysis
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Imagen de voltaje de dos fotones con sensores basados en rodopsina

Christiane Grimm1, Ruth R Sims1, Dimitrii Tanese1

  • 1Institut de la Vision, Sorbonne Université, INSERM, CNRS, 75012 Paris, France.

Neuron
|February 13, 2026
PubMed
Resumen

Los investigadores diseñaron indicadores de voltaje codificados genéticamente (GEVI) basados en rodopsina para imágenes de dos fotones (2P). Este avance permite la detección de potenciales de acción de alta velocidad y alta relación señal-ruido in vivo e in vitro.

Palabras clave:
detección de potencial de acciónimagen funcional rápidailuminación holográficarodopsina microbianaimagen sin escaneomicroscopía de dos fotonesindicadores de voltaje

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Área de la Ciencia:

  • Neurociencia
  • Imagen óptica
  • Biología molecular

Sus antecedentes:

  • La imagen de voltaje de dos fotones (2P) ofrece un monitoreo de la actividad neuronal en profundidad y de alta resolución.
  • La imagen de voltaje 2P actual utiliza principalmente sensores de tipo ASAP, mientras que los sensores basados en rodopsina se utilizan principalmente con iluminación de un fotón (1P).

Objetivo del estudio:

  • Demostrar la compatibilidad de los indicadores de voltaje codificados genéticamente (GEVI) basados en rodopsina con la iluminación 2P.
  • Diseñar nuevos GEVI basados en rodopsina para mejorar la imagen de voltaje 2P.
  • Evaluar el rendimiento de estos sensores en diversas preparaciones y condiciones biológicas.

Principales métodos:

  • Ingeniería racional de un nuevo GEVI basado en rodopsina, denominado Jarvis.
  • Prueba de Jarvis y GEVI de opsina FRET existentes (pAce, Voltron2) bajo iluminación 1P y 2P.
  • Comparación de métodos de iluminación 2P sin escaneo y escaneo 2P rápido.
  • Evaluación de la detección de potencial de acción en rodajas de hipocampo de ratón, larvas de pez cebra y corteza de ratón despierto.

Principales resultados:

  • Se demostró la compatibilidad exitosa con la iluminación 2P para GEVI basados en rodopsina, incluidos Jarvis, pAce y Voltron2.
  • Se identificó una relación señal-ruido (SNR) mejorada para GEVI de opsina FRET bajo baja irradiancia utilizando iluminación 2P sin escaneo.
  • Se logró la detección de potencial de acción de alta SNR a velocidades de kilohertz utilizando Jarvis y pAce in vitro e in vivo.

Conclusiones:

  • Los GEVI basados en rodopsina son herramientas eficaces para la imagen de voltaje 2P de alto rendimiento.
  • La iluminación 2P sin escaneo mejora la SNR para los GEVI de opsina FRET.
  • Este trabajo amplía el conjunto de herramientas para el monitoreo de la actividad neuronal en profundidad y de alta velocidad en sistemas biológicos complejos.