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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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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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A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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Single-Neuron Level One-Photon Voltage Imaging With Sparsely Targeted Genetically Encoded Voltage Indicators.

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Frontiers in Cellular Neuroscience
|March 21, 2019
PubMed
Summary

This study demonstrates a sparse transgenic expression strategy for genetically encoded voltage indicators (GEVIs). This method enables single-cell resolution voltage imaging of cortical pyramidal cells in intact brain tissue.

Keywords:
cerebral cortexoptogeneticssparse expressiontransgenicvoltage imaging

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Area of Science:

  • Neuroscience
  • Optical Imaging
  • Molecular Biology

Background:

  • Simultaneous voltage imaging of numerous neurons at single-cell resolution is challenging due to signal detection issues in dense neural tissue.
  • Genetically encoded voltage indicators (GEVIs) have advanced optical voltage recordings in intact tissue by targeting specific cell types or using sparse expression.
  • Achieving widespread sparse GEVI expression is crucial for imaging densely populated neuronal populations like cortical pyramidal cells.

Purpose of the Study:

  • To demonstrate a sparse transgenic expression strategy for GEVI imaging in cortical pyramidal cells.
  • To enable single-cell resolution voltage imaging in intact brain tissue without soma restriction.
  • To quantify functional crosstalk and inform future GEVI experimental design.

Main Methods:

  • Utilized a recently described sparse transgenic expression strategy for GEVI.
  • Performed voltage imaging in intact brain tissue, focusing on cortical pyramidal cells.
  • Quantified functional crosstalk between neurons.

Main Results:

  • Successfully achieved single-cell resolution voltage imaging of cortical pyramidal cells in intact brain tissue.
  • Demonstrated the efficacy of the sparse transgenic expression strategy without soma restriction.
  • Quantified functional crosstalk, providing data for optimizing imaging rates.

Conclusions:

  • Sparse transgenic GEVI expression is a viable strategy for high-resolution voltage imaging of dense neuronal populations.
  • This approach overcomes limitations of previous GEVI imaging techniques in intact neural tissue.
  • The findings provide critical insights for designing future GEVI experiments for neuronal circuit analysis.