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Photon


Photons are produced by changes in quantum state of a charged particle, from a state of higher energy to a state of lower energy.
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Photons have spin 1 and they are therefore bosons. Photons mediate the electromagnetic field (that is, they are the particles that enable other particles to interact with each other electromagnetically and with the electromagnetic field), ...
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Photons of light that are picked up by any of the pigment molecules in the antenna pass their energy to nearby pigment molecules until it is eventually passed to a special molecule of chlorophyll a called the reaction center.
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photon A unit of light energy.
photooxidation The change in the structure of a molecule due to exposure to light; sometimes referred to as bleaching.
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MULTI-PHOTON MICROSCOPY
A microscopy technique that uses simultaneous absorption of two or more photons of a long wavelength to excite fluorophores that are normally excited by a single photon of shorter wavelength.
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ANL's Advanced Photon Source Illuminates Ribosomal Activities
Using the Advanced Photon Source at Argonne National Laboratory (ANL) to gain a detailed picture of ribosomal function, a team from the U.K.
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photochemical reaction center The part of a photosynthetic complex where the energy of an absorbed photon causes charge separation, initiating electron transfer. The "special pair" photon A unit of light energy.
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To put it another way, the beam can be considered as a stream of photons; where each photon strikes the surface is determined only by the orientation of the beam (assuming that the surface is stationary).
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(X-ray photons aimed at a tumor tend to be partially scattered by structures within the body, unintentionally damaging internal organs. The challenge is to minimize this effect while maximizing the radiation dose delivered to the tumor.) Using a ...
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A single photon (the minimum unit of light) absorbed by a small cluster of adjacent rods is sufficient to send a signal to the brain.
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Radiation, such as X-rays and gamma rays (high energy photons), that causes atoms to release electrons and become ions.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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Describe how the pigments found on thylakoid membranes are organized into photosystems and how they relate to photon light energy.
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And examples of some of these kinds of tools would be confocal microscopy, which has evolved into multi-photon confocal microscopy.
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