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Over the past two years, scientists have studied the SARS-CoV-2 virus in great detail, laying the foundation for developing COVID-19 vaccines and antiviral treatments. Now, for the first time, scientists at the Department ...
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In order to maintain cellular homeostasis (i.e., a state of equilibrium), cells undergo selective autophagy or self-degradation of unwanted proteins. Autophagy receptors control this process, by mediating the selection of ...
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Most Americans believe science and religion are incompatible, but a recent study suggests that scientific engagement can actually promote belief in God.
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Together with researchers from the University of Nantes and the University of Reims Champagne-Ardenne in France, experts from the National Research Nuclear University MEPhI have recently developed a quantum dot-based microarray ...
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Researchers at Sanford Burnham Prebys Medical Discovery Institute (SBP) have developed a proof-of-concept nanosystem that dramatically improves the visualization of tumors. Published today in Nature Communications, the platform ...
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When the brain is at work, large numbers of neurons within it interact rapidly, passing messages, sometimes across large distances. The most recent addition to Rockefeller University's faculty, Alipasha Vaziri, devises optical ...
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Scientists at the Campus Vienna Biocenter (Austria) have found a way to overcome some of the limitations of light microscopy. Applying the new technique, they can record the activity of a worm's brain with high temporal ...
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Tracing the metabolism of tumor cells using magnetic resonance imaging (MRI) has not been feasible in routine clinical settings hitherto. Now, an interdisciplinary research team including the Technical University of Munich ...
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Multiple system atrophy (MSA) is a neurodegenerative disorder characterized by the aggregation of α-synuclein in the brain. Now, scientists from Japan, in collaboration with three pharmaceutical companies, have developed ...
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In physics, a quantum (plural: quanta) is an indivisible entity of a quantity that has the same units as the Planck constant and is related to both energy and momentum of elementary particles of matter (called fermions) and of photons and other bosons. The word comes from the Latin "quantus", for "how much." Behind this, one finds the fundamental notion that a physical property may be "quantized", referred to as "quantization". This means that the magnitude can take on only certain discrete numerical values, rather than any value, at least within a range. There is a related term of quantum number.
A photon is often referred to as a "light quantum". The energy of an electron bound to an atom (at rest) is said to be quantized, which results in the stability of atoms, and of matter in general. But these terms can be a little misleading, because what is quantized is this Planck's constant quantity whose units can be viewed as either energy multiplied by time or momentum multiplied by distance.
Usually referred to as quantum "mechanics", it is regarded by virtually every professional physicist as the most fundamental framework we have for understanding and describing nature at the infinitesimal level, for the very practical reason that it works. It is "in the nature of things", not a more or less arbitrary human preference.
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