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Related Concept Videos

Crossover Experiments01:16

Crossover Experiments

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Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
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ATP Driven Pumps III: V-type Pumps01:30

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Axion-Driven Cosmic Magnetogenesis during the QCD Crossover.

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We propose a mechanism for generating early Universe magnetic fields using axion dark matter and thermoelectric effects during the QCD crossover. This results in a detectable magnetic field strength and scale, offering a test for cosmological origins.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • The origin of magnetic fields in the early Universe is a significant unsolved problem.
  • Axions are a candidate for dark matter, and their properties may influence cosmological phenomena.
  • The Quark-Gluon Plasma (QGP) undergoes a phase transition (QCD crossover) in the early Universe.

Purpose of the Study:

  • To propose a novel mechanism for generating magnetic fields in the early Universe.
  • To investigate the role of axions and thermoelectric effects in magnetic field generation.
  • To provide a testable prediction for the cosmological origin of magnetic fields.

Main Methods:

  • Modeling thermoelectric field generation in the primordial plasma during the QCD crossover.
  • Coupling the axion field to the electromagnetic field to drive electric currents.
  • Incorporating turbulent dynamo amplification and Alfvénic unwinding to determine the present-day magnetic field strength and scale.

Main Results:

  • A mechanism is proposed where thermoelectric fields, driven by pressure gradients in the quark-lepton plasma, interact with axion gradients.
  • This interaction generates rotational electric fields and subsequently magnetic fields on subhorizon scales.
  • The predicted present-day magnetic field strength is B∼10^{-13} G on a scale L_{B}∼20 pc, with a strong BL_{B}^{1/2} characteristic.

Conclusions:

  • The proposed mechanism provides a viable route for generating magnetic fields in the early Universe, linked to axion dark matter.
  • The predicted magnetic field properties offer a unique observational signature, testable via gamma-ray observations of distant blazars.
  • Concomitant gravitational wave signals may reveal the amplitude of pressure gradients, while ongoing experiments could confirm axion existence.