Bloch oscillations are periodic oscillations of quantum particles in a repeating energy "landscape" (e.g., a crystal lattice) that are subjected to a constant force. These particle motions have been the focus of numerous ...
High-density lipoproteins (HDL), also known as "good cholesterol," remove excess cholesterol from the body's tissues and transport it to the liver. This process is known to prevent atherosclerosis, the build-up of plaque ...
Bio & Medicine
Sep 29, 2025
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Growing evidence suggests that a subsurface ocean lurks beneath the icy surface of Uranus' moon Ariel, but new research, published in Icarus, characterizes the possible evolution of this ocean, and found that it may have ...
Planetary Sciences
Sep 29, 2025
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33
Venus is often called Earth's "sister planet" because of their similarities in size, mass, and composition. Both are rocky worlds that formed about the same time in the inner solar system; however, despite these similarities, ...
Planetary Sciences
Sep 29, 2025
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1
A team led by UCL (University College London) and Imperial College London researchers has shown for the first time how life-saving antibiotics called polymyxins pierce the armor of harmful bacteria.
Cell & Microbiology
Sep 29, 2025
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107
It is anticipated that within just a few decades, the surging volume of digital data will constitute one of the world's largest energy consumers. Now, researchers at Chalmers University of Technology, Sweden, have made a ...
Condensed Matter
Sep 26, 2025
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109
Researchers from The University of Western Australia node at the International Centre for Radio Astronomy Research (ICRAR) have uncovered an immense structure, which spans an astonishing 185,000 light-years between galaxies ...
Astronomy
Sep 24, 2025
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88
SpaceX's sunrise launch from Cape Canaveral on Sunday was the 80th launch of the year on the Space Coast, which is on track to break the annual record and surpass 100 for the year.
Space Exploration
Sep 22, 2025
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Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs), but for other body organs it is of little help.
Evolution
Sep 18, 2025
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Science is a story of coming up with theories then doing our best to disprove them. That is especially true for theories on a grand, cosmological scale, though disproving them can be particularly hard.
Astronomy
Sep 16, 2025
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In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
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