News tagged with fluorescence

Exit through the lymphatic system

Our brain swims. It is fully immersed in an aqueous liquid known as cerebrospinal fluid. Every day, the human body produces about half a litre of new cerebrospinal fluid in the cerebral ventricles; this liquid originates ...

Nov 10, 2017
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New tool offers snapshots of neuron activity

Many cognitive processes, such as decision-making, take place within seconds or minutes. Neuroscientists have longed to capture neuron activity during such tasks, but that dream has remained elusive—until now.

Jun 26, 2017
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Mitochondria found to run as high as 50 C

(Phys.org)—A team of researchers with members from France, Korea and Germany has found that temperatures inside human mitochondria can run as high as 50°C. In their paper uploaded to the preprint server bioRxiv, the group ...

May 10, 2017
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Fluorescence

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength. It is a form of luminescence. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation.

The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye, and the emitted light is in the visible region.

Fluorescence has many practical applications, including mineralogy, gemology, chemical sensors (fluorescence spectroscopy), fluorescent labelling, dyes, biological detectors, and, most commonly, fluorescent lamps.

This text uses material from Wikipedia, licensed under CC BY-SA

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