'Gut sense' is hardwired, not hormonal
If you've ever felt nauseous before an important presentation, or foggy after a big meal, then you know the power of the gut-brain connection.
Sep 20, 2018
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If you've ever felt nauseous before an important presentation, or foggy after a big meal, then you know the power of the gut-brain connection.
Sep 20, 2018
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704
(Medical Xpress)—One way to increase our understanding of bilateral brains, like our own, is to inspect their paired sensory systems. In our visual system, the optic nerves normally combine at a place called the optic chiasm. ...
Salk scientists have developed a new way to selectively activate brain, heart, muscle and other cells using ultrasonic waves. The new technique, dubbed sonogenetics, has some similarities to the burgeoning use of light to ...
Sep 15, 2015
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Researchers at the University of Maryland School of Medicine (UMSOM) have for the first time identified stem cells in the region of the optic nerve, which transmits signals from the eye to the brain. The finding, published ...
Jul 31, 2020
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Hunger can drive a motivational state that leads an animal to a successful pursuit of a goal—foraging for and finding food.
Mar 15, 2024
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Research from Boston Children's Hospital suggests the possibility of restoring at least some visual function in people blinded by optic nerve damage from glaucoma, estimated to affect more than 4 million Americans, or from ...
Jan 14, 2016
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Research surrounding addiction often points to the reward of a "high" as the primary motivation for drug use and relapse. However, it's often the acute symptoms of withdrawal, including nausea, vomiting, pain and cramping, ...
Jul 17, 2020
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(Medical Xpress) -- Distinct neural pathways are important for different aspects of language processing, researchers have discovered, studying patients with language impairments caused by neurodegenerative diseases.
Nov 24, 2011
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Modern imaging modalities have facilitated a steady progress in medicine and treatment of diseases. Among them, Raman spectroscopy has gained attention for clinical applications as a label-free, non-invasive method to deliver ...
(HealthDay)—A new pill can help prevent relapse in some people with multiple sclerosis (MS), new research indicates.
Sep 19, 2012
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An optical fiber (or fibre) is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communications. Fibers are used instead of metal wires because signals travel along them with less loss, and they are also immune to electromagnetic interference. Fibers are also used for illumination, and are wrapped in bundles so they can be used to carry images, thus allowing viewing in tight spaces. Specially designed fibers are used for a variety of other applications, including sensors and fiber lasers.
Light is kept in the core of the optical fiber by total internal reflection. This causes the fiber to act as a waveguide. Fibers which support many propagation paths or transverse modes are called multi-mode fibers (MMF), while those which can only support a single mode are called single-mode fibers (SMF). Multi-mode fibers generally have a larger core diameter, and are used for short-distance communication links and for applications where high power must be transmitted. Single-mode fibers are used for most communication links longer than 550 metres (1,800 ft).
Joining lengths of optical fiber is more complex than joining electrical wire or cable. The ends of the fibers must be carefully cleaved, and then spliced together either mechanically or by fusing them together with an electric arc. Special connectors are used to make removable connections.
This text uses material from Wikipedia, licensed under CC BY-SA