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Related Concept Videos

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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Induced-fit Model01:13

Induced-fit Model

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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Multifunctional Flexible Sensor Based on Laser-Induced Graphene.

Tao Han1, Anindya Nag2, Roy B V B Simorangkir3

  • 1DGUT-CNAM Institute, Dongguan University of Technology, Dongguan 523106, China.

Sensors (Basel, Switzerland)
|August 10, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost, easy-to-fabricate laser-induced graphene sensor for multi-sensing. The novel sensor demonstrates effective electrochemical and strain-sensing capabilities, paving the way for versatile applications.

Keywords:
capacitive sensorselectrochemical sensingflexible sensorsinterdigitallaser-induced graphenestrain sensingwearable sensors

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Nanotechnology

Background:

  • Developing cost-effective and versatile sensors is crucial for advanced applications.
  • Laser-induced graphene (LIG) offers a promising route for rapid sensor fabrication.
  • Existing sensors often lack the multi-modal sensing capabilities required for complex tasks.

Purpose of the Study:

  • To design and fabricate a low-cost, easy-to-fabricate laser-induced graphene sensor.
  • To implement the fabricated sensor for multi-sensing applications, including electrochemical and strain sensing.
  • To validate the sensor's functionality and performance using impedance spectroscopy.

Main Methods:

  • Laser irradiation of commercial polymer film for photo-thermal graphene generation.
  • Patterning graphene into an interdigitated shape and transferring it onto Kapton tape for capacitive sensor electrodes.
  • Utilizing impedance spectroscopy to analyze sensor response in electrochemical and strain-sensing scenarios.

Main Results:

  • Successful fabrication of a low-cost, easy-to-fabricate laser-induced graphene sensor.
  • Demonstrated electrochemical sensing of varying sodium sulfate concentrations.
  • Validated strain-sensing capabilities for monitoring human joint movements and tactile sensing.

Conclusions:

  • The fabricated laser-induced graphene sensor is a cost-effective and versatile platform.
  • The sensor shows significant potential for diverse multi-sensing applications.
  • This work highlights the applicability of LIG for developing advanced sensor technologies.