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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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Carbon Skeletons

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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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A Soft, Flexible Implant for Wireless Photothermal-Pyroelectric Neurostimulation.

Jiang Wu1, Minmin Mao2,3, Beltzane Garcia Cirera4

  • 1School of Electronic Science and Engineering (School of Microelectronics), South China Normal University, Foshan, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 20, 2026
PubMed
Summary

Researchers developed a new non-invasive method using light to stimulate neural progenitor cells (NPCs) to differentiate into neurons. This photothermal-pyroelectric stimulation enhances neural repair for neurodegenerative diseases.

Keywords:
BaTiO3cell differentiationphotothermalpyroelectric

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Neuroscience

Background:

  • Neural progenitor cells (NPCs) hold promise for treating neurodegenerative diseases but suffer from low differentiation efficiency.
  • Current neural repair strategies face challenges in practical application due to limitations in existing methods.

Purpose of the Study:

  • To develop a novel, non-invasive strategy to enhance the neuronal differentiation of NPCs.
  • To investigate the potential of photothermal-pyroelectric stimulation for neural regeneration.

Main Methods:

  • Fabrication of a hybrid film using BaTiO3 (BTO) nanocrystals on a CNT@PDMS composite membrane.
  • Application of periodic light irradiation to induce photothermal and pyroelectric effects for localized electric stimulation.
  • Assessment of NPC differentiation using immunofluorescent staining and Western blot analysis.

Main Results:

  • Photothermal-pyroelectric stimulation significantly promoted the neuronal differentiation of NPCs.
  • Enhanced differentiation was mediated by the activation of Ca2+ signaling and the PI3K/Akt pathway.
  • BTO nanosheets with exposed (001) facets showed superior neurogenic differentiation compared to BTO nanoparticles, indicating a facet-dependent pyroelectric effect.

Conclusions:

  • Wireless photothermal-pyroelectric stimulation offers a promising non-invasive approach for enhancing neural differentiation.
  • This study introduces pyroelectric regenerative medicine as a novel strategy for repairing damaged neural tissue.