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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Design Example: Forces in Sluice Gate01:11

Design Example: Forces in Sluice Gate

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In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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Portas lógicas químicas OR y XOR programables impulsadas por luz y puertas lógicas químicas programables.

Konrad Szaciłowski1, Wojciech Macyk, Grazyna Stochel

  • 1Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. szacilow@chemia.uj.edu.pl

Journal of the American Chemical Society
|April 6, 2006
PubMed
Resumen

El dióxido de titanio nanocristalino modificado con pentacianoferatos muestra una conmutación fotoelectroquímica única. Este efecto fotoelectroquímico de conmutación de fotocorriente (PEPS) permite la creación de nuevas puertas lógicas químicas impulsadas por la luz.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • La electroquímica es electroquímica.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El dióxido de titanio nanocristalino es un material clave en la fotoelectroquímica.
  • Los pentacianoferratos ofrecen propiedades electrónicas sintonizables.
  • Los dispositivos fotoelectroquímicos pueden exhibir respuestas complejas a la luz.

Objetivo del estudio:

  • Para investigar las propiedades fotoelectroquímicas del dióxido de titanio modificado con pentacianoferratos.
  • Para explorar el efecto fotoelectroquímico de conmutación de fotocorriente (PEPS).
  • Para demostrar el potencial para la construcción de puertas lógicas químicas impulsadas por la luz.

Principales métodos:

  • Fabricación de fotoelectrodos utilizando dióxido de titanio nanocristalino y pentacianoferatos.
  • Mediciones electroquímicas bajo diferentes potenciales.
  • Experimentos fotoelectroquímicos que utilizan diferentes longitudes de onda de la luz (UV y visible).

Principales resultados:

  • Cambios observados de la dirección de la fotocorriente (anódico a catódico y viceversa) con cambios en el potencial y la longitud de onda de la luz.
  • Se logra la misma intensidad para las corrientes anódicas (UV) y catódicas (visibles) a potenciales específicos.
  • Se ha demostrado una fotocorriente neta cero bajo radiación UV y visible simultáneas debido a la compensación de la fotocorriente.

Conclusiones:

  • El efecto PEPS en el dióxido de titanio modificado ofrece un control fotoelectroquímico único.
  • La capacidad de compensar las corrientes fotográficas es clave para el desarrollo de sistemas fotoelectroquímicos avanzados.
  • Este fenómeno proporciona una base para nuevas aplicaciones de puertas lógicas químicas impulsadas por la luz.