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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
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Magnetic Field of a Solenoid01:18

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Magnetic Field Lines01:19

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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Radical Autoxidation01:20

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Spin Relaxation Does Not Preclude Magnetic Field Effects on Lipid Autoxidation.

Gesa Grüning1,2,3, Luca Gerhards1, Chris Sampson4,5

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This summary is machine-generated.

Magnetic field effects (MFEs) persist in lipid bilayers, challenging previous assumptions about spin relaxation. This study reveals that lipid dynamics enhance MFEs, with implications for diseases like cancer and ferroptosis.

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Area of Science:

  • Biophysics
  • Chemical Physics
  • Computational Biology

Background:

  • Spin correlations are crucial for biological processes, with spin relaxation dictating their decay.
  • Magnetic field effects (MFEs) in lipid autoxidation are proposed to originate from lipid peroxide radicals, but rapid membrane relaxation raises questions about their persistence.
  • Understanding spin dynamics in membranes is vital for elucidating biological mechanisms and disease pathologies.

Purpose of the Study:

  • To investigate the persistence of MFEs in lipid bilayers despite spin relaxation.
  • To identify the key molecular dynamics and interactions driving spin relaxation in lipid peroxide radicals within membranes.
  • To explore the influence of magnetic field strength on MFEs in biological membranes.

Main Methods:

  • All-atom molecular dynamics (MD) simulations of a palmitoyl-linoleoyl-phosphatidylcholine (PLPC) model membrane with lipid peroxide radicals.
  • Density functional theory (DFT) calculations to determine g-tensors and hyperfine coupling constants.
  • Spin dynamics modeling incorporating MD-derived fluctuations and Bloch-Redfield-Wangsness relaxation theory.

Main Results:

  • Peroxide group rotation and lipid backbone dynamics were identified as primary drivers of spin relaxation.
  • Spin relaxation is dominated by g-fluctuations, which surprisingly enhance MFEs at both high and weak magnetic fields.
  • MFEs were demonstrated to persist in lipid bilayers despite significant thermal motion and relaxation effects.

Conclusions:

  • MFEs can persist in lipid bilayers, contrary to previous assumptions, due to specific molecular dynamics.
  • G-fluctuations play a critical role in modulating MFEs, enhancing them across a range of magnetic field strengths.
  • These findings have significant implications for understanding biological MFEs and their roles in ferroptosis, cancer, and oxidative stress-related diseases.