An international team of nuclear physicists has determined that particles called strange quarks do, indeed, contribute to the ordinary properties of the proton.
Quarks are subatomic particles that form the building blocks of atoms. How quarks assemble into protons and neutrons, and what holds them together, is not clearly understood. New experimental results are providing part of the answer.
The experiment, called G-Zero, was performed at Thomas Jefferson National Accelerator Facility in Newport News, Va. Designed to probe proton structure, specifically the contribution of strange quarks, the experiment has involved an international group of 108 scientists from 19 institutions. Steve Williamson, a physicist at the University of Illinois at Urbana-Champaign, is the experiment coordinator.
James E. Kloeppel | EurekAlert!
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Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
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