(Medical Xpress)—In the realm of DNA sequencing, the Polymerase Chain Reaction (PCR) is a well-established tool for amplifying a specific DNA sequence by reiteratively processing what's known as a reaction cocktail between ...
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A National Heart and Lung Institute, Imperial College London study has confirmed that hands and surfaces could potentially transmit SARS-CoV-2 in a household setting. Published in The Lancet Microbe, the study, "Risk factors ...
A lot has been written recently about the merits of different potential vaccines for SARS-CoV-2. "Merit" is generally assumed to mean that the vaccine will make us immune. But what, exactly, is immunity, and how would we ...
Drug resistant superbugs are expected to overwhelm the healthcare system, reverse a century's worth of medical progress and claim more lives than cancer by 2050 unless efforts are accelerated to stop antibiotic resistant ...
New research, published today in Nature, reveals how increasing brain stiffness as we age causes brain stem cell dysfunction, and demonstrates new ways to reverse older stem cells to a younger, healthier state.
Aug 14, 2019
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Researchers at the Stanford University School of Medicine have discovered a new signal that cancers seem to use to evade detection and destruction by the immune system.
Jul 31, 2019
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Brains are made of more than a tangled net of neurons. Star-like cells called astrocytes diligently fill in the gaps between neural nets, each wrapping itself around thousands of neuronal connections called synapses. This ...
Nov 8, 2017
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(Medical Xpress)—A trio of researchers with the University of Texas and Rensselaer Polytechnic Institute has discovered which phase of visual information processing during human walking is used most to guide the feet accurately. ...
By using magnetic resonance imaging (MRI) to study the brains of infants who have older siblings with autism, scientists were able to correctly identify 80 percent of the babies who would be subsequently diagnosed with autism ...
Feb 15, 2017
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In mathematics, specifically in topology, a surface is a two-dimensional topological manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R3 — for example, the surface of a ball or bagel. On the other hand, there are surfaces which cannot be embedded in three-dimensional Euclidean space without introducing singularities or intersecting itself — these are the unorientable surfaces.
To say that a surface is "two-dimensional" means that, about each point, there is a coordinate patch on which a two-dimensional coordinate system is defined. For example, the surface of the Earth is (ideally) a two-dimensional sphere, and latitude and longitude provide coordinates on it — except at the International Date Line and the poles, where longitude is undefined. This example illustrates that not all surfaces admits a single coordinate patch. In general, multiple coordinate patches are needed to cover a surface.
Surfaces find application in physics, engineering, computer graphics, and many other disciplines, primarily when they represent the surfaces of physical objects. For example, in analyzing the aerodynamic properties of an airplane, the central consideration is the flow of air along its surface.
This text uses material from Wikipedia, licensed under CC BY-SA
