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Related Concept Videos

Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Sample Handling01:02

Sample Handling

Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
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Leaky Scanning

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 stands for...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds
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Published on: November 26, 2012

Sorting sloppy Sonic.

Shawn C Little1, Thomas Gregor

  • 1Department of Molecular Biology and Howard Hughes Medical Institute, Princeton University, Princeton, NJ 08544, USA.

Cell
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Zebrafish neural tube cells actively sort into correct positions after disordered specification by Sonic hedgehog, challenging classic morphogen gradient models. This study reveals an alternative mechanism for spatial patterning in development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Neuroscience

Background:

  • Classic developmental biology models posit that cells achieve correct spatial arrangement by reading precise morphogen gradients.
  • Sonic hedgehog (Shh) is a key signaling molecule involved in embryonic development, particularly neural patterning.

Discussion:

  • Xiong et al. present evidence for an alternative patterning strategy in the zebrafish neural tube.
  • This study challenges the traditional view of morphogen-driven spatial organization.

Key Insights:

  • Zebrafish neural tube cells actively migrate and sort to achieve correct positions.
  • This active sorting occurs even after specification fates are initially disordered by Sonic hedgehog signaling.
  • This suggests a mechanism independent of, or in addition to, gradient interpretation for precise tissue patterning.

Outlook:

  • Further research can explore the molecular mechanisms underlying this active cell sorting process.
  • Understanding this alternative patterning strategy may have implications for regenerative medicine and understanding developmental disorders.
  • This finding opens new avenues for investigating cell behavior and tissue organization in embryonic development.