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Related Concept Videos

Clipper Circuit

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...

Phase Contrast and Differential Interference Contrast Microscopy

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

Transformations of Functions III

Transformations of Functions III

Transformations modify the graphical representation of a function without changing its fundamental form. One common transformation is reflection, which flips the graph across a designated axis. When the vertical coordinates of all points are multiplied by the negative one, the entire graph is mirrored over the horizontal axis. This transformation reverses the vertical orientation of peaks and troughs, akin to signal inversion in electrical systems, where a waveform is flipped, but the timing of...

Half wave rectifier

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.

Angle of Twist: Problem Solving

Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...

Rotation of Asymmetric Top

Rotation of Asymmetric Top

By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...

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Related Experiment Video

Updated: May 23, 2026

Dissection and Mounting of Drosophila Pupal Eye Discs

Dissection and Mounting of Drosophila Pupal Eye Discs

Published on: November 9, 2014

Turning Dicer on its head.

Ahilya N Sawh, Thomas F Duchaine

Nature Structural & Molecular Biology

|April 5, 2012

Summary

Structural analysis of human Dicer reveals a new enzyme model. This provides a structural basis for understanding Dicer

Area of Science:

Biochemistry
Structural Biology
Molecular Biology

Background:

Dicer is a crucial enzyme in RNA interference.
Understanding Dicer's structure is key to its function.

Discussion:

A novel model for the domain arrangement of full-length human Dicer has been proposed.
This model is supported by recent structural analysis.

Key Insights:

The new model offers a structural basis for Dicer's biochemical properties.
This advances the understanding of Dicer's enzymatic mechanisms.

Outlook:

Further research can explore the implications of this new model.
This could lead to the development of new therapeutic strategies targeting RNA interference.

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Last Updated: May 23, 2026

Dissection and Mounting of Drosophila Pupal Eye Discs

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