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Related Concept Videos

Torque01:10

Torque

Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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 current...
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...

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Related Experiment Video

Updated: Jun 7, 2026

Light/dark Transition Test for Mice
10:35

Light/dark Transition Test for Mice

Published on: November 13, 2006

Masahiko Yoshimura.

Masahiko Yoshimura

    Angewandte Chemie (International Ed. in English)
    |May 5, 2025
    PubMed
    Summary

    Masahiko Yoshimura finds chemistry exciting, enabling him to design and create molecules with predictable functions. His approach blends imagination with scientific knowledge for molecular innovation.

    Area of Science:

    • Organic Chemistry
    • Molecular Design
    • Chemical Synthesis

    Background:

    • Masahiko Yoshimura's passion for chemistry stems from the ability to conceptualize and synthesize molecules.
    • He believes in the power of imagination in scientific discovery.

    Purpose of the Study:

    • To highlight Masahiko Yoshimura's innovative approach to molecular design.
    • To showcase the practical application of imagination in chemistry.

    Main Methods:

    • Conceptualization of molecular structures.
    • Laboratory synthesis of designed molecules.
    • Functional testing of synthesized compounds.

    Main Results:

    • Successful design and synthesis of novel molecules.

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    Last Updated: Jun 7, 2026

    Light/dark Transition Test for Mice
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    Published on: October 11, 2024

  • Demonstration of designed molecules functioning as intended.
  • Validation of the role of imagination in achieving specific molecular outcomes.

    • Conclusions:

    • Chemistry offers a unique platform for creative scientific expression.
    • Imagination is a crucial driver for innovation in molecular science.
    • Masahiko Yoshimura's work exemplifies the synergy between creativity and empirical science.