photolysis


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photolysis

 [fo-tol´ĭ-sis]
chemical decomposition or change by the action of light or other radiant energy. adj., adj photolyt´ic.

pho·tol·y·sis

(fō-tol'i-sis),
Decomposition of a chemical compound or cleavage of a chemical bond by the action of light.
[photo- + G. lysis, dissolution]

photolysis

/pho·tol·y·sis/ (fo-tol´ĭ-sis) chemical decomposition or change by the action of light or other radiant energy.photolyt´ic

pho·tol·y·sis

(fō-tol'i-sis)
Decomposition of a chemical compound by the action of light.
[photo- + G. lysis, dissolution]

photolysis

chemical decomposition using light energy (‘splitting by light’). In 1933, Cornelius van Niel proposed that the initial step in PHOTOSYNTHESIS was the photolysis of water, leading to the release of oxygen ions (forming oxygen gas) and hydrogen ions which were involved in the reduction of NADP during the LIGHT REACTIONS. Recently it has become more common to explain the breakdown of water as a ‘separation of charge’, a fast spontaneous ionic reaction with water splitting into hydrogen (H+) and hydroxl (OH-) ions. The end result is the same as photolysis, but light is not thought to be involved in the process.

photolysis

chemical decomposition by light.
References in periodicals archive ?
The new sensors - the Vernier Flash Photolysis Spectrometer, Pressure Sensor 400, and Platinum-Cell Conductivity Probe - offer instructors and students greater versatility for conducting laboratory investigations.
3] with alcohols, alkanes, and aromatics can be observed, which implies that highly reactive hydroxyl radicals generated from photolysis of [O.
It also adds a section on non-specific methods for the destruction of hazardous organic chemicals, including potassium permanganate oxidation and advanced oxidation processes, such as the Fenton reaction and photolysis.
While much of this DON is not available in soil, it can be subsequently transformed in freshwaters by UV photolysis into biologically available forms of N and hence contribute to eutrophication.
Control experiments were carried out to ensure that observed EPR signals did not arise from photolysis or oxidation products of the spin traps themselves as well as to monitor the EPR signal stability in the dark and under illumination.
The Report of the Board of Review for Decamethylcyclopentasiloxane (Siloxane D5) concluded that, due to its high vapour pressure, D5 tends to partition primarily into air, where it is quickly degraded into harmless compounds by indirect photolysis.
Any protein that has a DNA sequence 25-50% similar to that of photolysis, but that lacks photolysis' ability to use blue light to repair UV-induced DNA damage, is called a cryptochrome (Lin & Todo, 2005; Sancar, 2004).
2+], one could perhaps hypothesize that UV photolysis of water could generate small amounts of hydroxyl radicals and hydroxide anion which somehow could react with [Hg.
Most herbicides decompose rapidly in soils via soil microbial decomposition, hydrolysis, or photolysis.
The phototoxicity is related to the photochemical reaction of the PAHs and reactive species formed during photolysis, which are determined by the intrinsic PAH structure, solvent used, co-existing chemicals, and light sources.