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The mechanisms by which light is thought to cause damage to the retina include the following: photothermal, photomechanical, and photochemical 43444546 Figure 3. To better understand the different mechanisms, we will briefly review the wave-particle duality of light first described by Einstein in Bush uvc advanced we may often think of light as being comprised of a continuous spectrum of different radiant wavelengths, it is vital to also consider the more particulate properties of light, including the existence of bush uvc advanced as quanta of energy referred to as photons.


Photothermal damage occurs by the transfer of radiant energy, a photon, from light to the retinal tissue. A photon can be absorbed by a molecule only if the photon energy is equivalent to the energy difference between the molecule's current energy state and an allowed higher-energy level known as the bush uvc advanced state. Therefore, rather than attain their excitation states, molecules in the tissue tend to gain both rotational and vibrational bush uvc advanced. This increase in mean kinetic energy is dissipated as molecules collide with each other and their temperature increases.


The ability of light to cause an increase in mean kinetic energy is inversely proportional to the wavelength of the light. This relationship between light and energy is described by the equation:. The shorter the wavelength, the greater the potential increase in kinetic energy and the greater the rise in temperature for a given exposure time. In a closed system, there is a proportional relationship between exposure time and thermal effect; in an open system, the amount of energy required to produce a given thermal effect increases for longer exposure times as energy in the form of heat dissipates bush uvc advanced the surrounding environment during the exposure.

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The duration of thermal exposure is usually between 0. On a cellular and molecular level, increases in temperature cause the denaturing of bush uvc advanced, loss of molecular tertiary structure, and fluidization of membranes.

Absorption of photothermal energy is thought to occur by one of three pigments: melanin located primarily in the melanosomes of the RPE and melanocytes of the choroid, xanthophyll located primarily in Muller cells and neurosensory retina, and haemoglobin in the blood vessels of the neurosensory retina and choroid. Melanin, the most bush uvc advanced absorber is located primarily in the RPE.

Therefore, an eye with an abundance of melanosomes, as in a heavily pigmented fundus, will more readily absorb photothermal energy. Following the application of laser to the retina and RPE, histological evidence of thermal damage is seen initially at the level of both the RPE and photoreceptors. Perhaps, the most common example bush uvc advanced photothermal damage to the retina is in the form bush uvc advanced the clinical usage of lasers for the treatment of various disease states of the retina including diabetic retinopathy, retinal oedema, retinopathy of prematurity, tumours of the choroid and retina, retinal tears, and retinal detachments Figure 4. While the indication for treatment and the method of application may vary depending on the disease entity, the basic concept of causing injury to the retina or focal lesion via the application localized thermal energy and subsequent increase in temperature remains the same.Advanced UV Light Technology for a Wide Range of Applications.

Suppression of UVC-induced cell damage and enhancement of DNA repair by the fermented milk, Kefir

As a LightSources and LightTech client, you benefit from our advanced UV light technology. Advanced UV Light Technology – Energy-efficient & Long Lasting. Rund Aussteller aus allen 50 Bundesstaaten der USA sowie etwa Besucher werden bush uvc advanced CULTIVATE'19 erwartet. Mehr erfahren · Unternehmen · UV.

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