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Related Concept Videos

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Harmonic Mean

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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Simple Harmonic Motion01:21

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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Energy in Simple Harmonic Motion01:23

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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Characteristics of Simple Harmonic Motion01:17

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The key characteristic of the simple harmonic motion is that the acceleration of the system and, therefore, the net force are proportional to the displacement and act in the opposite direction to the displacement. Additionally, the period and frequency of a simple harmonic oscillator are independent of its amplitude. For example, diving boards move faster or slower based on their thickness. A stiff, thick diving board has a large force constant, which causes it to have a smaller period, while a...
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Simple harmonic motion (SHM) is a type of periodic motion in time and position, in which an object oscillates back and forth around an equilibrium position with a constant amplitude and frequency. In SHM, there is a continuous exchange between the potential and kinetic energy, which results in the oscillation of the object.
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Harmonic Nanoparticles for Regenerative Research
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Malaria Detection by Third-Harmonic Generation Image Scanning Cytometry.

Alexei Kazarine1, Fadi Baakdah2, Angelica A Gopal1

  • 1Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada.

Analytical Chemistry
|January 3, 2019
PubMed
Summary
This summary is machine-generated.

A new malaria detection method, third-harmonic generation image scanning cytometry (THGISC), offers rapid, label-free diagnosis by detecting parasite byproducts. This automated approach aids in confirming malaria and monitoring treatment effectiveness.

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Area of Science:

  • Biomedical Optics
  • Parasitology
  • Medical Diagnostics

Background:

  • Malaria remains a global health challenge, with diagnosis often relying on time-consuming microscopy.
  • Current diagnostic methods require skilled personnel and can be slow, hindering timely treatment.

Purpose of the Study:

  • To develop and validate a novel, automated method for malaria detection and parasite density quantification.
  • To leverage third-harmonic generation (THG) imaging for label-free detection of malaria parasites.

Main Methods:

  • Proposed third-harmonic generation image scanning cytometry (THGISC), combining THG imaging, high-speed scanning, and automated software.
  • Utilized THG signal from hemozoin, a malaria parasite byproduct, for contrast.
  • Applied THGISC to lab-cultured parasites and patient blood samples, comparing results to microscopy.

Main Results:

  • Demonstrated THG signal from hemozoin, enabling label-free detection of malaria parasites.
  • Successfully applied THGISC for automated malaria detection in patient blood smears.
  • Showcased the potential for rapid and accurate parasite density determination.

Conclusions:

  • THGISC provides a rapid, automated, and label-free method for malaria detection.
  • This technique can aid in confirming malaria diagnoses and monitoring treatment progress effectively.
  • Offers a promising alternative to traditional microscopy for malaria diagnostics.