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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

23.8K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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Electric Potential and Potential Difference01:16

Electric Potential and Potential Difference

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Suppose a positive test charge moves away from a positive static charge, then the Coulomb force does positive work, and its electric potential energy decreases. The potential energy per unit charge is defined as the electric potential. The electric potential is independent of the test charge.
When a test charge moves from the initial to the final position, the electric potential difference between those positions is defined as the ratio of the change in the potential energy to the charge on the...
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Identifying Statistically Significant Differences: The F-Test01:14

Identifying Statistically Significant Differences: The F-Test

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The F-test is used to compare two sample variances to each other or compare the sample variance to the population variance. It is used to decide whether an indeterminate error can explain the difference in their values. The underlying assumptions that allow the use of the F-test include the data set or sets are normally distributed, and the data sets are independent of each other. The test statistic F is calculated by dividing one variance by another. In other words, the square of one standard...
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Sum and Difference OpAmps01:22

Sum and Difference OpAmps

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Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
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Related Experiment Video

Updated: Jan 28, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Over 100-THz bandwidth selective difference frequency generation at LaAlO3/SrTiO3 nanojunctions.

Lu Chen1,2, Erin Sutton1,2, Hyungwoo Lee3

  • 11Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 USA.

Light, Science & Applications
|March 2, 2019
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Researchers developed a tunable terahertz (THz) source with nanoscale precision. This breakthrough enables THz spectroscopy on individual molecules and nanoparticles, advancing light-matter interaction studies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Terahertz (THz) spectroscopy offers unique insights into molecular and material properties.
  • Achieving nanoscale spatial resolution in THz generation is crucial for studying individual entities.

Purpose of the Study:

  • To develop a continuously tunable, narrow-band THz generation source with nanometer-scale spatial resolution.
  • To explore the LaAlO3/SrTiO3 (LAO/STO) interface as a platform for nanoscale THz emission.

Main Methods:

  • Utilized femtosecond optical pulse shaping for selective difference frequency generation.
  • Employed conductive atomic force microscope lithography to define nanoscale junctions at the LAO/STO interface.
  • Performed numerical simulations of time-domain signals to understand THz generation mechanisms.

Main Results:

  • Achieved over 100 THz bandwidth in tunable THz generation.
  • Demonstrated THz emission from nanoscale junctions at the LAO/STO interface.
  • Validated the potential for THz spectroscopy on individual nanoparticles or molecules.

Conclusions:

  • The developed nanoscale coherent THz source enables precise investigation of light-matter interactions.
  • The LAO/STO interface serves as a versatile platform for integrated lab-on-chip optoelectronic devices.
  • This technology opens new avenues for selective control of molecular resonances.