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Related Concept Videos

The Wave Nature of Light02:12

The Wave Nature of Light

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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Notch Signaling Pathway03:14

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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
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Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Half wave rectifier01:20

Half wave rectifier

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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.
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Full wave rectifier01:22

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A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
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Related Experiment Video

Updated: Feb 13, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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A Notch Hiding in the R Wave.

Ross MacKenzie

    Journal of Insurance Medicine (New York, N.Y.)
    |March 1, 2018
    PubMed
    Summary

    A normal-appearing electrocardiogram (ECG) may still show subtle signs of underlying structural heart disease. These hidden indicators can be crucial for early diagnosis and intervention in cardiac conditions.

    Area of Science:

    • Cardiology
    • Electrocardiography
    • Cardiac Imaging

    Background:

    • Electrocardiograms (ECGs) are standard non-invasive tools for assessing cardiac electrical activity.
    • Interpreting ECGs typically focuses on identifying overt abnormalities.
    • Structural heart disease can sometimes present with ECG findings that appear normal at first glance.

    Purpose of the Study:

    • To investigate subtle electrocardiographic findings that may indicate underlying structural heart disease.
    • To highlight the importance of detailed ECG analysis beyond routine interpretation.
    • To improve the early detection of cardiac abnormalities.

    Main Methods:

    • Review of ECGs from patients with confirmed structural heart disease.
    • Analysis of ECG parameters often overlooked in standard interpretations.

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  • Correlation of ECG findings with results from advanced cardiac imaging (e.g., echocardiography, cardiac MRI).

    • Main Results:

    • Specific subtle ECG patterns were identified in a significant proportion of patients with structural heart disease.
    • These subtle findings were not immediately apparent on initial ECG review.
    • The presence of these subtle clues correlated with specific types of structural abnormalities.

    Conclusions:

    • Electrocardiography can provide valuable clues to structural heart disease even when the overall appearance is benign.
    • A meticulous approach to ECG interpretation is essential for uncovering these subtle indicators.
    • Early identification of these subtle ECG signs may facilitate timely diagnosis and management of structural heart disease.