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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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Inductive Effects on Chemical Shift: Overview01:27

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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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.
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Updated: Sep 10, 2025

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Changes in cellular composition shape the inductive properties of Hensen's Node.

Tatiane Y Kanno1,2,3, Megan Rothstein1,2,3, Marcos Simoes-Costa4,5,6

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA, USA.

Nature Communications
|August 21, 2025
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Summary
This summary is machine-generated.

The organizer, crucial for vertebrate body plan development, comprises two distinct cell populations in avian embryos. These anterior and posterior cells possess unique functions, guiding head and trunk specification respectively during early development.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Cell Biology

Background:

  • The organizer directs vertebrate body plan establishment via inductive signaling.
  • Hensen's node in avian embryos is the key organizer during gastrulation.
  • The cellular composition and function of Hensen's node are not fully understood.

Purpose of the Study:

  • To elucidate the cellular architecture and functional heterogeneity of the Hensen's node.
  • To identify distinct cell populations within the organizer and their roles in axial specification.

Main Methods:

  • Single-cell RNA sequencing to identify transcriptionally distinct cell populations.
  • In ovo transplantation assays to assess trunk-inducing activity of identified cells.

Main Results:

  • Hensen's node contains two transcriptionally and functionally distinct organizer cell populations.
  • Anterior cells express GSC and are associated with head induction.
  • Posterior cells co-express organizer and mesodermal genes, exhibiting trunk-inducing activity.

Conclusions:

  • The organizer is a dynamic, spatially compartmentalized structure.
  • Temporal shifts in anterior and posterior cell populations regulate inductive capacity.
  • This coordinated patterning ensures proper vertebrate body axis formation.