The invention relates to a light guide panel capable of distributing light beams incident from a light source to an entire surface thereof. The light guide panel has at least two through holes formed in a path of the incident light beams, apart in a predetermined interval from a light incident surface. The through holes are formed perpendicular to the path of the incident light beams, and lined along the light incident surface of the light guide panel. The light guide panel according to the present invention can improve uniformity of incident light without increasing the number or size of the light source, thereby distributing the incident light in a wider angle and decreasing a light mixing region. The light guide panel is produced in a simple manufacturing process, reducing the manufacturing costs.
Summary As the ear has dual functions for audition and balance, the eye has a dual role in detecting light for a wide range of behavioral and physiological functions separate from sight [1-11]. These responses are driven primarily by stimulation of photosensitive retinal ganglion cells (pRGCs) that are most sensitive to short-wavelength (∼480 nm) blue light and remain functional in the absence of rods and cones [8-10]. We examined the spectral sensitivity of non-image-forming responses in two profoundly blind subjects lacking functional rods and cones (one male, 56 yr old; one female, 87 yr old). In the male subject, we found that short-wavelength light preferentially suppressed melatonin, reset the circadian pacemaker, and directly enhanced alertness compared to 555 nm exposure, which is the peak sensitivity of the photopic visual system. In an action spectrum for pupillary constriction, the female subject exhibited a peak spectral sensitivity (λmax) of 480 nm, matching that of the pRGCs but ...
When chlorophyll a absorbs light energy, an electron gains energy and is excited. The excited electron is transferred to another molecule (called a primary electron acceptor). The chlorophyll molecule is oxidized (loss of electron) and has a positive charge. Photoactivation of chlorophyll a results in the splitting of water molecules and the transfer of energy to ATP and reduced nicotinamide adenine dinucleotide phosphate (NADP). The chemical reactions involved include: condensation reactions - responsible for water molecules splitting out, including phosphorylation (the addition of a phosphate group to an organic compound) oxidation/reduction (redox) reactions involving electron transfer Photosynthesis is a two stage process. 1. The Light dependent reactions, a light-dependent series of reactions which occur in the grana, and require the direct energy of light to make energy-carrier molecules that are used in the second process: light energy is trapped by chlorophyll to make ATP (ph. ...
The present invention provides an instrument adapted for alignment with a light beam, which instrument includes an instrument body having a point of entry of the light beam, a light conducting channel, and a sensing element carried by the instrument and being spaced from the point of entry of the light beam. The sensing element serves to provide indication of alignment or misalignment between the instrument and the light beam. The light beam travels inside the instrument along the light conducting channel extending from the point of entry to the sensing element. One or more light guiding devices are disposed inside the light conducting channel to increase precision of alignment between the instrument and the light beam. The light guiding device has a wall forming a guiding passage inside the guiding device. When disposed inside the instrument, the wall of the guiding device blocks non-aligned light beams from reaching the sensing element, while allowing the aligned light beams to propagate along a
The research results can be applied and transferred in the tea plantations and companies, tea processing enterprises in our country.
Light exposure induces oxidative stress, which contributes to ocular diseases of aging. Blue light provides a model for light-induced oxidative stress, lipid peroxidation and retinal degeneration in Drosophila melanogaster. In contrast to mature adults, which undergo retinal degeneration when exposed to prolonged blue light, newly-eclosed flies are resistant to blue light-induced retinal degeneration. Here, we sought to characterize the gene expression programs induced by blue light in flies of different ages to identify neuroprotective pathways utilized by photoreceptors to cope with light-induced oxidative stress. To identify gene expression changes induced by blue light exposure, we profiled the nuclear transcriptome of Drosophila photoreceptors from one- and six-day-old flies exposed to blue light and compared these with dark controls. Flies were exposed to 3 h blue light, which increases levels of reactive oxygen species but does not cause retinal degeneration. We identified substantial gene
Plants employ a variety of mechanisms to maximize photosynthetic potential under changing environmental conditions. For example, most plants can biochemically adapt to excessive light by altering the size of light harvesting complexes, dissipating excess energy as heat, scavenging reactive oxygen, and rapidly repairing damaged reaction center proteins (Niyogi, 1999). Developmental changes that occur in response to different light conditions include variations in leaf thickness, density of mesophyll cells, and changes in the orientation of the leaf blade (Boardman, 1977). These responses have been associated with improved photosynthetic potential and/or protection from photodamage. However, their relative importance can be species specific, indicating that some of these responses represent unique adaptive strategies. Another perhaps more ubiquitous plant response to varying light conditions is light-induced chloroplast movement, which has been documented in a large number of species, including ...
We have demonstrated the function of EML1 and its participation in the recovery of sensitivity under continuous illumination in UV- and blue-sensitive zebrafish cones. Sensitivity recovery in the first tens of seconds after the onset of adapting light was first reported in ERG studies of the flicker response of several mammalian and nonmammalian species (Muller-Limmroth and Andree, 1953). Studies of flicker ERG in frog suggested that the sensitivity recovery originates in cones (Owen and Sillman, 1973; Haynes and Sillman, 1986), which was directly demonstrated in single cell studies of turtle cones under continuous illumination (Normann and Perlman, 1979; Burkhardt, 1994). In humans, the cone-driven "b" wave in the ERG (Gouras and MacKay, 1989) and cone-driven psychophysical perception (Stockman et al., 2006, 2007) also exhibit slow sensitivity recovery under continuous illumination. However, the rate of this sensitivity recovery is slower than that measured in the nonmammalian photoreceptors, ...
The presence of copper (Cu) contamination is known to cause relevant light-induced degradation (Cu-LID) effects in p-type silicon. Due to its high diffusivity, Cu is generally regarded as a relatively benign impurity, which can be readily relocated during device fabrication from the wafer bulk, i.e. the region affected by Cu-LID, to the surface phosphorus-doped emitter. This contribution examines in detail the impact of gettering by industrially relevant phosphorus layers on the strength of Cu-LID effects. We find that phosphorus gettering does not always prevent the occurrence of Cu-LID. Specifically, air-cooling after an isothermal anneal at 800°C results in only weak impurity segregation to the phosphorus-doped layer, which turns out to be insufficient for effectively mitigating Cu-LID effects. Furthermore, we show that the gettering efficiency can be enhanced through the addition of a slow cooling ramp (-4°C/min) between 800°C and 600°C, resulting in the nearly complete disappearance of ...
Introduction. Photosynthesis Coursework Introduction Background Information Glucose can be converted to sucrose and carried to other parts of the plant in phloem vessels. Glucose can also be converted into starch and stored Light Sometimes light is a limiting factor. A plant may have lots of water and carbon dioxide, but it will not photosynthesize very fast if there is not enough light; increasing the light intensity will make photosynthesis faster. Carbon dioxide Sometimes the level of carbon dioxide is limiting. There may be plenty of light but the plant cannot photosynthesize because it has run out of carbon dioxide. Temperature Temperature can be a limiting factor too. The rate of photosynthesis will be limited if it is too cold for the enzymes to work properly. ...read more. Middle. Diagram Preliminary method I was going to do a method which involved counting the bubbles at different light intensities. I chose not to do this method as it is and inaccurate method to show volume of O2 ...
A light emitting diode (LED) warning signal light, the warning signal light comprising a plurality of light sources constructed and arranged with a reflector or cullminator, the LED light source being in electrical communication with a controller and a power supply, battery, or other electrical source. The warning signal light provides various colored light signals for independent use or use by an emergency vehicle. These light signals may include a strobe light, revolving light, an alternating light, a flashing light, a modulated light, a pulsating light, an oscillating light or any combination thereof. Additionally, the warning signal light may be capable of displaying symbols, reverse characters, or arrows. The controller may further be adapted to regulate or modulate the power intensity exposed to the illuminated LEDs to create a variable intensity light signal.
A new technique that stimulates heart muscle cells with low-energy light raises the possibility of a future light-controlled pacemaker, researchers have indicated.
The current guidance in the Regulations and in the relevant Codes of Practice, BS 8300:2009 is that adequate visual contrast is provided if the Light Reflectance Values (LRV) of the contrasting areas differ by at least 30 points. The current British Standard for the measurement of LRV is BS8493:2008+A1:2010. Manufacturers are advised, for example, by the Guild of Architectural Ironmongery[1] to publish the LRV for their products. Designers are beginning to demand them. On signage with words or pictograms The Americans with Disabilities Act accessibility guidelines (ADAAG) recommend a light reflectance value of 70%, but this is not a strict requirement.[3] Several other color combinations in the 60-70% range also work well. Color contrast is determined by the formula [(B1 - B2) / B1] x 100, where B1 is the LRV of the lighter area, and B2 is the LRV of a darker area.[4][5] ...
The control of sleep/wakefulness is associated with the regulation of energy metabolism. The present experiment was designed to assess the effect of nocturnal blue light exposure on the control of sle
what are the products of light dependent reactions - 28 images - review for quiz on photosynthesis worland, the two steps of photosynthesis from openstax college, ppt photosynthesis powerpoint presentation id 1090782, science is cool, unit 6 photosynthesis cellular respiration ppt
TY - JOUR. T1 - In vivo determination of optical properties of normal and tumor tissue with white light reflectance and an empirical light transport model during endoscopy. AU - Bargo, P. R.. AU - Prahl, S. A.. AU - Goodell, T. T.. AU - Sleven, R. A.. AU - Koval, G.. AU - Blair, G.. AU - Jacques, S. L.. PY - 2005/5/1. Y1 - 2005/5/1. N2 - Determination of tissue optical properties is fundamental for application of light in either therapeutical or diagnostics procedures. In the present work we implemented a spatially resolved steady-state diffuse reflectance method where only two fibers (one source and one detector) spaced 2.5 mm apart are used for the determination of the optical properties. The method relies on the spectral characteristics of the tissue chromophores (water, dry tissue, and blood) and the assumption of a simple wavelength dependent expression for the determination of the reduced scattering coefficient. Because of the probe dimensions the method is suited for endoscopic ...
Long daylength artificial light exposure associates with disorders and a potential physiological mechanism has been proposed. However, previous studies have examined no more than three artificial light treatments and limited metabolic parameters, which have been insufficient to demonstrate mechanical responses. Here, comprehensive physiological response curves were established and the physiological mechanism was strengthened. Chicks were illuminated for 12, 14, 16, 18, 20, or 22 h periods each day. A quadratic relationship between abdominal adipose weight (AAW) and light period suggested that long-term or short-term light exposure could decrease the amount of AAW. Quantitative relationships between physiological parameters and daily light period were also established in this study. The relationships between triglycerides (TG), cholesterol (TC), glucose (GLU), phosphorus (P) levels and daily light period could be described by quadratic regression models. TG levels, AAW and BW positively correlated with
Novel visible-light-responsive photocatalysts (CsBi2Nb5O16 and CsBiNb2O7) were prepared using a conventional solid-state reaction method. CsBiNb2O7 and CsBi2Nb5O16 belong to a layered perovskite structure and a defective pyrochlore structure, respectively. These prepared samples have photocatalytic properties to decompose 2-propanol under visible light irradiation.
A light clock measures time by having a light pulse source initiating a light pulse which travels a preset distance in an open or closed loop. A counter is increases incrementally upon detection of the light pulse by a light pulse detector. Each increment is a time interval, which is determined by the preset distance divided by the speed of the light pulse. If the loop is an open loop, another light pulse may be initiated upon detection of the previous light pulse. If the loop is a closed loop, no further light pulse initiation beyond the initial light pulse is required, but, when necessary, a light pulse amplifier is used to amplify the light pulse for the next cycle around the closed loop in the light pulse transmission device.
AKVIS LightShop Tutorial. Light Effects Elements. Sphere is a ball-shaped light element with a soft glowing halo surrounding it. LightShop adds amazing light effects to your pictures.
Plants do not only gain energy from light, they also use light as a source of information in order to adapt growth and development to environmental conditions. They have a range of photoreceptors to detect different aspects of their light environment, such as the light intensity and spectral composition, the direction of the light gradient, or temporal light patterns (Kami et al., 2010). Cryptochromes, phototropins, members of the ZEITLUPE (ZTL) family, and UV RESISTANCE LOCUS 8 (UVR8) monitor the blue (B) and UV-B range of the light spectrum, whereas phytochromes (PHYs) are essential for the perception of red (R) and far-red (FR) light (Kami et al., 2010; Heijde and Ulm, 2012). Phytochromes can exist in two different states, the inactive Pr form with maximal absorption in R light, and the active or Pfr form of phytochromes, which has an absorption peak in FR light. By absorption of light, these forms reversibly convert into each other, resulting in an equilibrium with a wavelength-specific ...
Your eyes are sensitive to a narrow band of frequencies referred to as the, "visible light spectrum." Visible light-light capable of being seen by the human eye -consists of wavelengths of varying lengths.. Blue light has a very short wavelength and is detectable by the human eye. Not only does it provide basic illumination to our worlds, blue light also helps to increase feelings of well-being. But exposure to large amounts of blue light can be harmful to the eyes.. The plethora of electronic devices in use today, such as cell phones, tablets, and laptop computers, has drastically increased our exposure to blue light. Another source of blue light is energy efficient technology in the form of fluorescent light bulbs and LED lights. Research has determined that the lens inside the eye, and the pigment in the back of the eye, offer some protection against blue light. But this protective mechanism only lasts for short period of exposure to the intense blue light, and during daylight hours.. Perhaps ...
The signal transduction machinery activated by PHY requires transcription factors such as PIF, HY5 and LAF1, which act in the de-etiolation process (Chattopadhyay et al., 1998; Ballesteros et al., 2001; Tepperman et al., 2001; Al-Sady et al., 2006). Recently, studies on phytochrome-regulated gene expression by means of microarray analyses showed that many other transcription factors are also early over-expressed through PHYA and PHYB (Quail, 2007).. It has been shown that PHYA, but not PHYB, plays a role in the transcriptional induction of phytoene synthase (psy) in Arabidopsis (von Lintig et al., 1997), by promoting the binding of HY5 to white, blue, red and far red light respon-sive elements (LREs) located in its promoter (Figure 2). LREs are described to be sufficient to confer responsiveness to light in promoters that are not induced normally by light (Roa-Rodríguez, 2003). The most common type of LREs that are present in genes activated by light are the ATCTA element, and the Gl (CACGAG) ...
Algal-derived compounds allow us to make assumptions about environmental conditions in the past. In order to better understand how organisms record environmental conditions, we grew microscopic marine algae at different light intensities, salinities, and alkalinities in a temperature-controlled environment. We determined how these environmental parameters affected specific algal-derived compounds, especially their relative deuterium content, which seems to be mainly affected by salinity ...
Photosynthesis is most efficient at light wavelengths between 400 and 500 nanometers and 600 to 700 nanometers. The green pigment, chlorophyll, restricts the efficiency of photosynthesis....
Blue light is part of the visible light spectrum, with wavelengths of about 415 nm to 495 nm. Blue light can be divided into two bands: blue-violet light (415-455 nm) and blue-turquoise light (465-495 nm).3 When light in the blueviolet range hits the eye, a process unique to this band of wavelength occurs. During the visual cycle, when opsin starts the process of phototransduction, certain intermediate products are produced that can also bind opsin and accept more photons within this range of wavelength, resulting in photoreversal that occurs faster than the normal visual cycle. This photoreversal enables the eye to absorb more blue light than any other kind of light.4. Photons of light are small units of energy, too much of which can result in uncoupling of cellular oxidative phosphorylation, which produces reactive oxygen species (ROS) that disrupt membranous structures of the photoreceptor outer segments and consequently damage delicate RPE cells. This damage causes incomplete phagocytosis ...
Membrane proteins are of significant importance, performing a variety of biological functions including pumps, channels, and receptors. Thus, membrane proteins represent attractive candidates as drug targets. Bacteriorhodopsin (bR), the most widely studied membrane protein, consists of seven transmembrane helical segments and functions which can work as a proton pump in Halobacterium Salinarium. In the present study, the reversible control of bR conformation with simple light illumination is examined, providing a protocol to probe membrane protein folding (a challenge even to this day due to the large, aggregation-prone hydrophobic regions of membrane proteins compared to soluble proteins). Two general methodologies are utilized to control membrane protein folding, including (1) saturation of the natural lipids with a photoresponsive surfactant resulting in partitioning of the protein into detergent-lipid mixed micelles in the unfolded state, and (2) the development of artificial bilayers ...
Membrane proteins are of significant importance, performing a variety of biological functions including pumps, channels, and receptors. Thus, membrane proteins represent attractive candidates as drug targets. Bacteriorhodopsin (bR), the most widely studied membrane protein, consists of seven transmembrane helical segments and functions which can work as a proton pump in Halobacterium Salinarium. In the present study, the reversible control of bR conformation with simple light illumination is examined, providing a protocol to probe membrane protein folding (a challenge even to this day due to the large, aggregation-prone hydrophobic regions of membrane proteins compared to soluble proteins). Two general methodologies are utilized to control membrane protein folding, including (1) saturation of the natural lipids with a photoresponsive surfactant resulting in partitioning of the protein into detergent-lipid mixed micelles in the unfolded state, and (2) the development of artificial bilayers ...
I have been studying research in the area of natural light and its interaction on the human brain. An important point to make is that appropriate exposure to natural light has positive effects on our circadian rhythm and in turn promotes many aspects of health.. We evolved from exposure to natural day lighting. The sun provides a specific wavelength (blue range) in the early morning that lasts until early afternoon. At that point a different light wavelength is produced (red to orange range). We recently discovered that the retina has a specific photoreceptor that detects light and sends it to a special part of the brain known as the suprachiasm, located near the hypothalamus. Once the suprachiasm is triggered, it sets off the hypothalamus, the master gland that in turn triggers the pituitary, thyroid, and adrenal glands of the brain and body. The hormonal reaction to light is what causes and promotes the diverse actions of the body and health.. The blue range of light helps our bodies become ...
Fig. 1: Retinal degeneration: a new model of blue-light induced damage Light microscopy photographs (magnification x400). Trichrome Masson staining of sagittal section of retina 14 days after blue light exposure. Approximately four rows of photoreceptor nuclei remaining and inner and outer segments were disrupted (Iris Pharma, France).. Blue light may damage the retina in a number of ways involving different chromophores and cellular events; however, retinal damage by photo chemical mechanism is most likely to be of relevance in the development of AMD. Photochemical reactions occur in normal ambient conditions and involve a reaction between energetic photons and an absorbing molecule in the presence of oxygen leading to the generation of reactive oxygen species (ROS) that are highly toxic to the retina.. Short-term exposure (up to about 12 hours) to relatively intense blue light, referred to as "blue light hazard", can produce damage at the level of RPE in primates. [9] The dependence of this ...
Fig. 1: Retinal degeneration: a new model of blue-light induced damage Light microscopy photographs (magnification x400). Trichrome Masson staining of sagittal section of retina 14 days after blue light exposure. Approximately four rows of photoreceptor nuclei remaining and inner and outer segments were disrupted (Iris Pharma, France).. Blue light may damage the retina in a number of ways involving different chromophores and cellular events; however, retinal damage by photo chemical mechanism is most likely to be of relevance in the development of AMD. Photochemical reactions occur in normal ambient conditions and involve a reaction between energetic photons and an absorbing molecule in the presence of oxygen leading to the generation of reactive oxygen species (ROS) that are highly toxic to the retina.. Short-term exposure (up to about 12 hours) to relatively intense blue light, referred to as "blue light hazard", can produce damage at the level of RPE in primates. [9] The dependence of this ...
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A fluorimeter comprises an excitation optical system projecting the excitation light having a selected wavelength for a sample to said sample, a sample cell for accommodating the sample; fluorescent light sensors for sensing the fluorescent light emitted from the sample; a transmission light sensor for sensing the light transmitted through the sample; and an arithmetic divider which divides the output of the fluorescent light sensor by the output of the transmission light sensor, and provides a signal representing the intensity of the fluorescent light which is corrected against the variation of the excitation light intensity.
Mracek, Philipp; Pagano, Chrstina; Fröhlich, Nadine; Idda, M. Laura; Cuesta, Ines H.; Lopez-Olmeda, Jose Fernando; Sánchez-Vázquez, F. Javier; Daniela Vallone, Daniela; Foulkes, Nicholas S ...
BACKGROUND Ultraviolet (UV) B irradiation causes visible erythema, which has been linked with DNA damage. However, besides such direct photochemical conformation changes, UVB also induces many indirect photochemical effects in the skin. Lipid peroxidation (LPO) is in this context one of the major pathways by which photo-oxidative stress disturbs cell signalling and promotes photocarcinogenesis and photoageing. So far we lack techniques for visualizing photo-oxidative stress in the skin. Furthermore, LPO has never been linked with individually acquired UVB doses measured by personal dosimetry. OBJECTIVES Measuring the skin reaction and photo-oxidative damage by LPO in vivo after UVB exposure in a pilot study surveyed by personal dosimetry in order to allow for a correlation analysis of acquired dose, skin reaction and amount of LPO. METHODS UVB exposure was measured with the opto-electronic X2000-1 (Gigahertz Optik, Puchheim, Germany) and the biological DLR Biofilm (German Aerospace Center DLR,
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A McCree study in 1972 studied the relative quantum yields of the photosynthetic spectrum and found that a mixture of light, with large quantities of green, produced the most photosynthetic output. However, later research found that photo pigments within the plant tissue absorb this green light and excite/de-excite out other photons such as red or blue. This means that a larger spectrum of light is used by plant, equating to the entire visible spectrum. Therefore, there is no such thing as waste light within the visible spectrum. However, the distribution of the delivered spectrum does heavily influence growth patterns.. Moreover, green light works in some plants to tell it that it is surrounded by other plants and needs a longer stem to break out, typically using the phytochrome mechanism, as does red and far-red light. Cryptochromes are also stimulated by green light to some degree, sometimes reversing blue light driven elongation inhibitory action (see article blue and red light). Due to ...
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The application discloses a kind of planar light source device and LCD device. In a kind of planar light source device, LGP comprises light introduction part and light guide plate main body, and light introduction part is configured to catch from spot light and sends and via the light of light entrance face incident. Light introduction part comprises inclined surface, and the surface of described inclined surface from the large part of the thickness of light guide plate main body described in Thickness Ratio is towards the surperficial sloped-end of described light guide plate main body. Described light guide plate main body comprises pointing to changes pattern, and described sensing conversion pattern is between the effective lighting region and described smooth introduction part of described light guide plate main body. Described sensing conversion pattern, by the pointing direction conversion of the light from described smooth introduction part to described effective lighting region, makes
glass, that substance will become visible to my eye through the blue glass when the heated body gives off blue light. Blue light comes through this liquid, and no other kind of light can pass. That no red light and that no yellow light will pass through this I can easily show you. Here, for in«tance, I can make a yellow flame. I will pi ice the lamp in the interior of this cylinder, and then if I place a little bit of common salt in the flame, we do not see the flame through the jar. Although this flame is glowingnow with an intense degree of yellow light, we shall observe no light coming through. If I place a red flame in the same jar, we shall not be able to see that this flame is coloured at all red in this blue glass. The same holds good, then, for these other vessels. Here I have some yellow solution through which only the yellow light will pass. No blue light and no red light can pass through this cylinder; and here I will show you that we get no red light. The flame is now burning with a ...
Want quick, easy-to-grow color in your meadow or garden? Annual Wildflowers are the perfect choice, whether youre adding more color to an existing Wildflower Meadow or planting an interim garden for the year, we have dozens of varieties to choose from. | Light Requirements: Full Sun; Bloom Season: Mid - Late Fall; Advantages: Deer Resistant, Pest / Disease Resistant, Extended Bloom Time (more than 4 weeks), Attract Butterflies
Want quick, easy-to-grow color in your meadow or garden? Annual Wildflowers are the perfect choice, whether youre adding more color to an existing Wildflower Meadow or planting an interim garden for the year, we have dozens of varieties to choose from. | Light Requirements: Full Sun; Bloom Season: Mid - Late Fall, Early - Mid Spring, Mid - Late Summer; Advantages: Deer Resistant, Pest / Disease Resistant
SECTION III - GLOSSARY. ACOUSTO-OPTIC. The effect, on the properties of a beam of light, by sound energy, interacting with the light within a volume of matter.. ACTIVE MEDIA. The material, in which most of the atoms can be placed in an excited state (i.e., population inversion state), so that an electromagnetic wave of the proper frequency passing through it can stimulate a cascade of photons.. BIREFRINGENT. The property of dividing a ray of light into two polarized rays (known as the ordinary and extraordinary rays), the directions of polarization of the rays being at right angles to each other.. COHERENT LIGHT. A single frequency of light. A light beam in which the electric vector at any point in it is related to that at any other point by a definite, continuous sinusoidal function.. DIFFRACTION. The bending of a light ray in passing the edge formed by contiguous opaque and transparent areas.. ELECTRO-OPTIC. The effect, on the properties of a beam of light, by an electrical field, interacting ...
A dental curing light includes a body, one or more LEDs configured to emit a first spectrum of light having a relatively short first peak wavelength (e.g., UV) disposed on the body, and a fluorescing lens that converts at least a portion of the first spectrum of light into a second spectrum of light having a second peak wavelength that is longer than the first peak wavelength. The second spectrum of light is selected so as to match the curing spectrum of a desired light-curable dental composition. In a preferred embodiment, the body comprises an elongate wand having a proximal end and distal end. The LEDs may be disposed at or near the distal end of the elongate wand.
The Photon Pod is a collaborative research project between Phillips, Cantifix and Oxford University to study the effects of various lights on health and wellbeing.
Scientists now realize that fluorescent light bulbs emit ultraviolet (UV) radiation, which is known to cause wrinkles and other signs of photoaging skin damage, such as blotchy skin pigmentation. Many years ago, I figured that out on my own after noticing Id get a mild sunburn after working in my shop when it was illuminated by fluorescent bulbs but not when Id be in there for an even longer time with the lights off, with illumination provided by light filtering in through the windows and especially the open 16-foot-wide door. (Parenthetical comment: Since sunlight contains UV, I suspect the diffused sunlight entering my garage was largely scrubbed of UV by trees, grass, and other plants.) Id also not burn when I worked under even brighter incandescent lighting.. Thus, you should add UV light exposure to the list of problems attributable to fluorescent lights, such as almost inevitable exposure to highly toxic mercury (see my article, How fluorescent bulbs turn us into sheeple/Where has all ...
Glial cells play an important role in the maintenance of normal structure and function of the neural components of the central nervous system. The Müller cells are one of the macroglial elements in the retina and their wide-ranging roles are responsible for the protection and proper functioning of the photoreceptors. In the present study, we aimed to test the effects of pretreatment with 670 nm red light on Müller cells in the light-induced model of retinal degeneration. Adult Sprague-Dawley albino rats were treated with 670 nm red light, from an LED source prior to exposure to bright (1000 lux) continuous light for 24 h. Müller cell-specific markers were used to assess structural and functional changes in this cell type 1 week after contact with damaging light. Changes in gene (Edn2, LIF, TNF-α) and protein (S100β, Vimentin, LIF, iNOS, GS, Cyclin-D1) levels and localization were evaluated using RT-qPCR, and immunohistochemistry. Our results showed that 670 nm light pretreatment ameliorates ...
Previous investigators have reported an increase in numbers of amacrine synapses in the inner plexiform layer (IPL) of the rat retina following light deprivation, and an increase in amacrine along with a decrease in bipolar synapses following light damage. Since there are several points of disagreement between the published reports on this subject we undertook a more detailed study of the effects of light deprivation and light damage on the retina. Four groups of eight male albino rat pups (14 days old) were raised for eight weeks under different conditions: (1) unsutured, bright light reared (UB); (2) bilaterally lid-sutured, bright light reared (SB); (3) unsutured, low light reared (UL); and (4) bilaterally lid-sutured, dark reared (SD). The intensity of the light given the UL group was equated with that striking the corneas of the SB group. Light microscopy showed that the retinas of the SB as well as the UB groups had almost complete degeneration of the outer retinal layers, indicating that ...
Figure S1. PIF5 binds with different frequency to various E-box sequences in vivo. PIF5 binding sites that were assigned to a gene locus were chosen. For each binding site the most central E-box was detected. Sequences with two E-boxes with the same distance to the peak summit were discarded from the analysis. E-box sequences were then counted and sense and antisense sequences as well as their reverse complements were grouped.. Figure S2. Chromatin Immunoprecipitation (ChIP) of PIF5-HA after 2 hours in low R/FR. Immunoprecipitated DNA was quantified by Q-PCR using primers in the promoter region containing a G-box or control region (minimum 1 kb 3 or 5 from the peak region). Data are average of technical triplicates of the Q-PCR. (A / B) Col and/or PIF5-HA lines were grown for 7 days in constant light conditions before being shifted for 2 hours in low R/FR conditions. (C) PIF5-HA lines were grown for 14 days in constant light conditions before being shifted for 2 hours in low R/FR ...
When it comes to bike lights I think the main issue is; How much attention can a bike light garner? Im of the opinion that if a bike light ( or lights ) are bright enough and clearly visible ( to anyone not drugged or not looking straight ahead ) there is a much better chance that the person who saw the light(s) will take measures not to hit the person with the light(s). The better your light strategy..ie..brighter lights, multiple lamps for a larger signature, the better your chances of being seen in low light conditions THUS lowering your chances of being hit my a motorist. I dont need a rocket scientist to tell me that my 200 lumen/blinking seat post lamp coupled with my 70 lumen flasher on my helmet is going to get me seen better than the guy riding wearing dark clothing and using only reflectors on the pedals. Now if the guy with no lights makes it home he lives to see another day. Good for him. That said Ill take my chances using my common sense and he can take his chances with his ...
The present light bulb includes a wide angle dispersed light which uses, as a source of light dispersion, crystalline particulate material incorporated into the molded or formed material of the light bulb. The crystalline particulate material can be incorporated into the light bulb material prior to the molding or forming process or it can be later applied to the surfaces of the light bulb. The crystalline particulate material are chosen to provide high reflectivity and dispersion qualities for the parts of the light bulb and are further chosen and incorporated according to the function of the particular piece or part therein incorporated. A light tuning element may also be used to further enhance the light dispersion qualities of the light bulb. Methods for making the present light bulb are also provided.
If you are looking for a quality replacement LED light for your car, this T10 / BA9S / Bicuspid 8W 400lm 48-SMD5050 LED White Light Car Reading Light / Panel Light is your best choice! Made with 48 SMD5050 LEDs, it gives off ultra bright white light up to 400 lumens with extremely low power consumption. It is also very easy to install. You can directly install it into any T10 or BA9S or bicuspid socket of car interior lights like reading light or panel light without extra wiring and tools. Click and order now ...
Join Lee Lanier for an in-depth discussion in this video Creating light effects, part of VFX Techniques: Crowd Replication with After Effects
Particles interact with incident light absorbing it and scattering it in all directions. The spatial distribution of scattered light depends on the ratio of particle size to wavelength of incident light. Particles much smaller than the wavelength of incident light exhibit a fairly symmetrical scattering distribution with approximately equal amounts of light scattered both forward and backward (Figure 1A). As particle sizes increase in relation to wavelength, light scattered from different points of the sample particle create interference patterns that are additive in the forward direction. This constructive interference results in forward-scattered light of a higher intensity than light scattered in other directions (Figures 1B and 1C). In addition, smaller particles scatter shorter (blue) wavelengths more intensely while having little effect on longer (red) wavelengths. Conversely, larger particles scatter long wavelengths more readily than they scatter short wavelengths of light. Particle ...
Newswise - Biologists and psychologists know that light affects mood, but a new University of Virginia study indicates that light may also play a role in modulating fear and anxiety. Psychologist Brian Wiltgen and biologists Ignacio Provencio and Daniel Warthen of U.Va.s College of Arts & Sciences worked together to combine studies of fear with…
Photosynthesis is much more important to humans than we would imagine. It affects everything in the biological chain, either directly or indirectly. How the process is affected with slight changes is also integral in our understanding of how we can better harness the process for desired environmental results.
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Experimental animals. Experiments were performed using Wistar rats, C57BL/6J mice, and p75NTR knock-out mice (purchased from the Jackson Laboratory) in accordance with the ARVO statement for the Use of Animals in Vision Research. Animals were maintained in either a 12 hr light/dark cycle (LD 12:12) or 24 hr of constant illumination. Light intensity inside the cages ranged from 100 to 200 lux under LD 12:12, whereas 800-1300 lux was used for 24 hr of constant illumination to effect light-induced retinal degeneration (Harada et al., 1996, 1998a).. Immunohistochemistry. Rats were anesthetized with diethylether and perfused transcardially with saline, followed by 4% paraformaldehyde in 0.1 m phosphate buffer containing 0.5% picric acid at room temperature. Rat eyes were removed and postfixed overnight in the same fixative and then embedded in paraffin. The posterior portion of the eye was sectioned sagittally at 7 μm thickness, mounted, and stained with hematoxylin and eosin. For ...
I m confused about cyclic and non-cyclic photophosporilation. Do they happen at the same time? And what connects them? Thanks a lot for the help...
An alternative approach was planned during the early stages of the project: the combination of LuxAB with another protein: YFP from Vibrio fischeri. This would shift the wavelength produced by LuxAB towards the green regions of the spectrum, to activate our green light sensor. During our discussions with UNAM-Genomics Mexico we realised that they planned on making the same part, so we stopped working on it, planning on testing its combination with our green light sensor later on. We unfortunately have not yet reached that stage, but the part is available in the registry as BBa_K360010.. In addition to the above, we created a codon-optimised mutant of the firefly luciferase, reported by Fujii et al. (2007) to be 12.5 times brighter than the wildtype. This may help to alleviate the problems foreseen with a lack of luminescence intensity failing to activate the light sensors of the corresponding wavelength.. LUCIE (LUCiferase with Intense Emission) has three mutations compared to the wild type: ...
Learn about the health impacts fluorescent lights can have, affecting your productivity, welfare, and body. See what solutions are available.
Almost all our food, feed, fuel and fiber ultimately derive from plants. Plant growth depends on photosynthesis, the process in which light energy is harnessed for the synthesis of high-energy carbon compounds. In order to capture light, plants have evolved unique ways of building cells, tissues and organs, a highly diverse metabolism, and a life-long continuation of versatile growth and development. Plants possess numerous photoreceptors enabling them to sense changes in the amount, spectral composition (color), photoperiod and direction of light. The central goal of our research is to understand how plants manage to gain access to direct sunlight when this resource becomes limiting. This occurs at high plant density leading to specific growth and developmental strategies such as the Shade Avoidance Syndrome (SAS) and Phototropism. We use the model plant Arabidopsis thaliana to study the molecular events leading from light perception to the physiological responses elicited by unfavorable light ...
The field of photonics starts with the efficient generation of light. The generation of efficient yet highly controllable light can indeed be accomplished with light-emitting diodes (LEDs), which are, in principle, capable of generating white light with a 20 times greater efficiency than conventional light bulbs. Deployed on a global scale to replace conventional sources, such solid-state light sources will result in enormous benefits that, over a period of 10 years, include (1) gigantic energy savings of 1.9 x 10*20 joule, (2) a very substantial reduction in global-warming CO2 emissions, (3) a strong reduction in the emission of pollutants such as acid-rain-causing SO2, mercury (Hg), and uranium (U), and (4) financial savings exceeding a trillion (10*12) US$. These benefits can be accomplished by the "replacement paradigm" in which conventional light sources are replaced by more energy efficient, more durable, and non-toxic light sources. However, it will be shown that solid-state light sources ...
A symbol reader which projects an illumination window or field that is the same size as a field of view of a sensor used to read a symbol. The illumination window is aligned with the field of view of the sensor. The window or field can provide an area of relatively constant illumination or edges of the window or field can be at a higher illumination creating an outline or capture border. The outline alone can be projected when the ambient light level is sufficient for capture of the symbol. The window or field can be created by projecting light from various light sources.
Get an answer for Describe how light is transduced to action potentials in the retina of the eye, including the roles of retinal, opsin, and the dark current and bleaching reaction. and find homework help for other Science questions at eNotes
The current study, in which Dr. Fuad Fares and Adina Yokler, Orna Harel and Hagit Schwimmer also participated, set out to establish or refute this hypothesis. In order to do so, four groups of lab mice injected with cancerous cells were examined: one group was exposed to "long days" of 16 hours of light and 8 hours of darkness, simulating exposure to artificial light beyond the natural number of light hours in a day; a second group was exposed to the same "long days" but were treated with melatonin; a third group was exposed to "short days" of 8 light hours and 16 dark hours; and a fourth group was exposed to the same "short days" but during the dark hours was exposed to a half-hour interval of light.. The results show once again the clear link between LAN and cancer: the cancerous growths in mice exposed to "short days" were smallest (0.85 cubic cm. average), while those mice exposed to the interval of LAN during dark hours had larger growths (1.84 cubic cm. average) and those exposed to "long ...
A growing body of evidence is pointing to potential eye damage from our ever-increasing exposure to the higher energy blue-violet light emitted from our
We evaluated the effect of different light combinations on powdery mildew resistance and growth of melon seedlings. Light-emitting diodes were used as the light source and there were five light combinations: white light (420-680 nm); blue light (460 nm); red light (635 nm); RB31 (ratio of red and blue light, 3: 1); and RB71 (ratio of red and blue light, 7: 1). Compared with other treatments, blue light significantly decreased the incidence of powdery mildew in leaves of melon seedlings. Under blue light, H2O2 showed higher accumulation, and the content of phenolics, flavonoid and tannins, as well as expression of the genes involved in synthesis of these substances, significantly increased compared with other treatments before and after infection ...
In addition to studying body size/energy use relationships, we are looking at how light availability plays a role in seedling abundance and total growth rate. As I said earlier, seedlings have significantly greater populations than older, established trees, however they reside on the forest floor, where light availability is greatly reduced. We are trying to understand how light availability/competition is impacting the growth of these seedlings. At the beginning of the summer, Colleen and I assessed various points within the megaplot for canopy openness, or otherwise the amount of light filtering through to the forest floor. At each spot, we looked at the canopy of the forest and used 4 categories to eyeball how much light was getting to the seedlings. We later went back to each location and used a hemispherical camera to further quantify the percent of canopy openness, which can be used to further defend our initial analysis. The light analysis and height measurements can help us determine how ...
As mentioned earlier, visible light is made up of the wavelengths that range from 400 nm to 700 nm. Each wavelength is characterized by a unique color, with violet on one end (adjacent to ultraviolet light) and red on the other (adjacent to infrared light). When all these wavelengths are combined together, they make up what is known as white light. You can separate these wavelengths (and the corresponding colors) by letting them pass through either a prism or a diffraction grating. The magnificent array of colors that we see in a rainbow, on a diamond, or even a peacocks tail are examples of this separation. All phenomena of visible light such as reflection, refraction, interference, and diffraction are also exhibited by non-visible wavelengths. Hence, by understanding these phenomena, and applying them to the non-visible wavelengths, scientists were able to unearth many of natures secrets. In fact, if we trace back the roots of modern physics, particularly the wave-particle duality of matter, ...
Ancient Greeks developed some theories that explained what light is, making it possible for scientists to decipher it. Muslim scientist Alhazen had the most prominent contribution to the study of light and the mechanism of vision; this is evident in his work The Book of Optics, which was translated into Latin five times. Alhazens theory is credited for the invention of the camera and the foundation of optics science.. Scientific research of light halted until the 17th century, when Isaac Newton resumed the journey to unravel the secrets of light, introducing the Particle Theory, which defines light as a bundle of particles and atoms that moves in straight lines. Newton strongly defended his theory, which helped us learn that light refracts into several colors later known as rainbow. It also showed that visible light ranges between 400 and 700 nanometer, spanning between the longer infrared light waves and the shorter ultraviolet light waves. The journey did not end with Newton; Dutch scientist, ...
By hijacking endogenous E3 ligase to degrade protein targets via the ubiquitin-proteasome system, PROTACs (PRoteolysis TArgeting Chimeras) provide a new strategy to inhibit protein targets that were regarded as undruggable before. However, the catalytic nature of PROTAC potentially leads to uncontrolled degradation that causes systemic toxicity issues, limiting the application of PROTAC in the clinic. Here, we introduce a light-inducible switch on PROTACs, thereafter termed as opto-PROTAC, to enable the degradation of protein targets in a spatiotemporal manner. By adding a photolabile caging group on pomalidomide as a parental compound and two additional PROTACs, dBET1 and dALK, we demonstrated light-inducible protein degradation. These opto-PROTACs display no activities in the dark, while the restricted degradation can be induced at a specific time and rate by ultraviolet A irradiation. Our approach provides a generalizable platform for the development of light-controlled PROTACs and enables ...
The research carried out by honours students Blake Williamson and Oliver Webb, also showed drivers are more inclined to jump red lights in areas of slower lower speed limits.. Between 2010-2012 and there were 665 crashes in New Zealand after cars failed to stop at red lights, involving nine fatalities. Numerous studies have investigated the behaviour of drivers that run red lights, Williamson says.. "Vehicle speed, road conditions, time of day, direction of movement and type of vehicle can all impact on why a large number of drivers run red lights. Little research has been carried out involving differences in sunlight levels during peak times and the subsequent effect they may have on red light running behaviour.. "To investigate further, we studied three intersections with traffics lights in Christchurch. Each intersection had a unique speed limit. One survey for each intersection was carried out during the autumn month of May and the same process repeated in the darker winter month of July. ...
Abstract from Ellen Bruzells lecture at symposium MED-10 Dentistry. (Organized by Ellen Bruzell). ESP-IUPB World Congress, Light & Life, Barcelona, Spain. August 25-30. 2019.. Dental personnel encounter a number of optical sources emitting a broad spectrum of wavelengths. Along with the usefulness, to various extents, of optical radiation in treatment and diagnostics, comes the risk of radiation exposure to the operators eyes and the patients oral tissues. The presentation will cover the "involuntary" and "voluntary" use of different light sources. The curing light used for photopolymerisation of dental materials is an everyday procedure in the clinic. Curing lights have evolved from emitting moderate intensities of UV to high intensity blue light LEDs of several watts per centimeter squared. Dental bleaching procedures combined with light is a controversial topic. It is debated whether the light improves the efficiency. Thereby, the justification of the use is questionable. The bleaching ...
A light emitting device includes a substrate; a light emitting element disposed on the substrate; and a wavelength conversion member disposed on or above the substrate, the wavelength conversion member covering the light emitting element spacing apart therefrom, and having a level difference at an outer peripheral portion of a lower end of the wavelength conversion member, the lower end being joined to the substrate via a light transmitting member. In addition, the light emitting device includes a light blocking member disposed on the substrate and disposed between the light emitting element and the light transmitting member. Further, the wavelength conversion member is configured so that the lower end thereof extends from a top of the light transmitting member to a side of the light transmitting member.
This is the best bicycle light I have ever found!! I really like how easy this light is to mount and to remove from the bike. The Lumenx Mountain Bike Light has many features that I really like. I grew up riding bikes with my family and these lights have come a long way from what the bicycle lights used to be. The new version of bicycle light made by Lumenx is a very sleek design and not too bulky. It has many great features like being able to zoom in or out and make the light wider or smaller. This is great for riding at night when you want to be able to see more of your surroundings. Besides having the zoom feature this front light also has a solid "on" setting or a "flash" setting. The flash setting helps people notice you more at night and is also a great safety feature when riding at night. Lumenx Mountain Bike Light also comes out of the mount and can be used as a flashlight in the case of an emergency. The red back light also has 2 settings, and "on" or "flash" setting. Also great for ...
BackgroundPlants have evolved complex mechanisms to adapt growth and development to the light environment. The COP1/SPA complex is a key repressor of photomorphogenesis in dark-grown Arabidopsis plants and acts as an E3 ubiquitin ligase to ubiquitinate transcription factors involved in the light response. In the light, COP1/SPA activity is inhibited by photoreceptors, thereby allowing accumulation of these transcription factors and a subsequent light response. Previous results have shown that the four members of the SPA family exhibit partially divergent functions. In particular, SPA1 and SPA2 strongly differ in their responsiveness to light, while they have indistinguishable activities in darkness. The much higher light-responsiveness of SPA2 is partially explained by the much stronger light-induced degradation of SPA2 when compared to SPA1. Here, we have conducted SPA1/SPA2 domain swap experiments to identify the protein domain(s) responsible for the functional divergence between SPA1 and ...
BackgroundPlants have evolved complex mechanisms to adapt growth and development to the light environment. The COP1/SPA complex is a key repressor of photomorphogenesis in dark-grown Arabidopsis plants and acts as an E3 ubiquitin ligase to ubiquitinate transcription factors involved in the light response. In the light, COP1/SPA activity is inhibited by photoreceptors, thereby allowing accumulation of these transcription factors and a subsequent light response. Previous results have shown that the four members of the SPA family exhibit partially divergent functions. In particular, SPA1 and SPA2 strongly differ in their responsiveness to light, while they have indistinguishable activities in darkness. The much higher light-responsiveness of SPA2 is partially explained by the much stronger light-induced degradation of SPA2 when compared to SPA1. Here, we have conducted SPA1/SPA2 domain swap experiments to identify the protein domain(s) responsible for the functional divergence between SPA1 and ...
When you are not actively using the watch by touching the screen or pressing buttons, the watch goes into a standby mode after one minute. The display is on, but in some low-light conditions, the screen might not be easily readable.. To improve readability in low-light conditions, you can use the standby backlight. This is a low-brightness backlight that is on all the time.. You can toggle the standby backlight on or off from the settings under General » Backlight » Standby.. Even though the standby backlight brightness is quite low, it decreases overall battery life because it is on all the time.. ...
Light and brassinosteroids (BRs) have been proved to be crucial in regulating plant growth and development; however, the mechanism of how they synergistically function is still largely unknown. To explore the underlying mechanisms in photomorphogenesis, genome-wide analyses were carried out through examining the gene expressions of the dark-grown WT or BR biosynthesis-defective mutant det2 seedlings in the presence of light stimuli or exogenous Brassinolide (BL). Results showed that BR deficiency stimulates, while BL treatment suppresses, the expressions of light-responsive genes and photomorphogenesis, confirming the negative effects of BR in photomorphogenesis. This is consistent with the specific effects of BR on the expression of genes involved in cell wall modification, cellular metabolism and energy utilization during dark-light transition. Further analysis revealed that hormone biosynthesis and signaling-related genes, especially those of auxin, were altered under BL treatment or light ...
Red Scaly Skin in Light-exposed Areas: Nutritional deficiencies can cause several health problems such as stunted bone growth, skin problems, digestive problems, dementia and more.
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All manner of artificial light sources are now being used to grow plants indoors, but not all of them are created equal.. Here you can see the output spectrum of a few of the most popular grow lighting technologies.. As you can see, compact fluorescent lights operate mainly in the blue end of the spectrum, which is predominantly used for the seed-to-vegetative stages of plant growth. High pressure sodium lights are the most commonly used for flowering and harvest stages of plant growth. Their strength lies in their sheer power and strong output in the amber range, into the red frequencies.. Also shown is one of the more popular LED grow lights. You can see it is very strong in the red frequencies and somewhat strong in the blues. This belief that only reds and blues from LED grow lights is necessary for plant growth is a common misconception, based on very old data, and taken out of context.. ...
Summary. Rams and ewes of the Romney Marsh (N = 6), Dorset Horn (N = 8) and Australian Merino (N = 8) breeds were subjected to 4 successive periods of alternating 6 h light/18 h dark (short days) and 18 h light/6 h dark (long days) preceded by 16 weeks of 12 h light/12 h dark. The initial period was of 32 weeks (16 weeks short days; 16 weeks long days) and the next 3 were of 24 weeks (12 weeks short days; 12 weeks long days).. Rams of all breeds showed a cyclic pattern of growth and regression of testes associated with plasma testosterone concentration, influenced by the change in light regimen 15-19 weeks previously. Sexual behaviour was also cyclic but lagged by some 6-7 weeks. The changes were greatest in the Romneys and least in the Merinos in which a higher degree of sexual activity was evident even when the testes were regressed (P , 0·001). This was the major breed difference.. All ewes of the Romney and Dorset breeds showed marked seasonality related to the imposed light ...
Induction of sleep by acute light in Opa1+/+ and Opa1+/− mice.(A) The average immobility-defined sleep is plotted against zeitgeber time in a normal 12∶12 h
Every month, there seems to be more and more research that comes out about the effect of blue light on our health. A recent Harvard Health report states that artificial blue light and natural blue light from the sun are very different. Blue light from technology has four times the blue light that we get from the sun because blue light from the sun is balanced with red, green, infrared, and ultraviolet light.. Excess blue light creates Reactive Oxygen Species (ROS) and this creates inflammation, even during the day. It also diminishes the function of your mitochondria and then your body has less energy to do the things it needs to do on a daily basis. Many of us work in environments where there is artificial light all day, such as offices, hospitals, etc, and I know that we often cant get away from these environments, because its our job! But what you do have to try and do, is to get natural light into your eyes at any time of the day and on your days-off. This means getting outside into nature ...
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A system for directing light in an interactive display system so as to perform multiple functions. In addition to projecting images on the interactive display system, the system is used to distribute infrared (IR) light onto the display surface, and/or to receive and focus received IR light reflected from a physical object on the display surface. A light separating system separates a multi-waveband light from a source into a predominantly visible light and a predominantly non-visible light, the latter being redirected around visible light modulators and recombined with the modulated visible light for projection onto the display surface by a lensing system. In addition, or in the alternative, the light separating system separates predominantly non-visible light reflected from an object adjacent to the surface, from light produced by the source, directing only the non-visible light received to the light sensor used to image the display surface.
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Blue light has gotten a bad rap, getting blamed for loss of sleep and eye damage. Personal electronic devices emit more blue light than any other color. Blue light has a short wavelength, which means that it is high-energy and can damage the delicate tissues of the eye. It can also pass through the eye to the retina, the collection of neurons that converts light into the signals that are the foundation of sight.Laboratory studies have shown that prolonged exposure to high-intensity blue light
Blue light has gotten a bad rap, getting blamed for loss of sleep and eye damage. Personal electronic devices emit more blue light than any other color. Blue light has a short wavelength, which means that it is high-energy and can damage the delicate tissues of the eye. It can also pass through the eye to the retina, the collection of neurons that converts light into the signals that are the foundation of sight.Laboratory studies have shown that prolonged exposure to high-intensity blue light
Delivering seizure-triggering images to epileptics through Twitter is a crime. But most of us, even the Twitter trolls, dont know why such flashes of light affect the brain.
In one embodiment, apparatus is provided with a light source, an optic element, at least one photosensor, and a control system. The optic element has a reflective material on a surface thereof, and is positioned to receive and reflect light emitted by the light source. The at least one photosensor is mounted to the surface of the optic element on which the reflective material resides, over a portion of the optic element on which the reflective material does not reside. The control system is operably associated with both the photosensor(s) and the light source, to regulate the light sources light output in accordance with measurements received from the photosensor(s).
Light during the day and darkness during the night is supporting a good night of sleep and a day full of energy. Most people recognize they feel much more energetic during a bright, sunny, day and often enjoy a sound sleep afterwards. Dark, gloomy days, especially in winter may induce feelings of lethargy, low spirit and sleepiness.. The reason why some people experience mild changes in energy levels, sleep need, and mood in winter, and others do not, is not really known. Whether it actually is the lack of light that is causing the symptoms is also unclear. What is known is that light exposure through the eyes, either by the sun or by an artificial light source, is able to counteract reduced feelings of well being.. In people experiencing seasonal changes, bright light during the short winter days, and in particular during the morning hours, may fight the low energy levels and improve mood. Already 30 minutes of light is capable of increasing subjective energy levels.. If one recognizes the ...
Posted by Marta Lisa on Aug 14, 2017 in Uncategorized , Comments Off on Light and Neuroprotection - Parkinsons and Beyond. This is a really wonderful review of how light is received by the body both directly and indirectly to help with cell regeneration in the brain and entire body. Impact Factor for 2016 is 1.769 Click here to view optimized website for mobile devices Journal is indexed with PubMed and Science Citation Index Expanded Table of Contents PERSPECTIVE Year : 2017 , Volume : 12 , Issue : 4 , Page : 574-575 Why and how does light therapy offer neuroprotection in Parkinsons disease? John Mitrofanis Ph.D. Department of Anatomy F13, University of.... read more ...
High-pressure sodium lights have a better color rendition than low-pressure sodium lights. The high-pressure lights produce a more desirable golden to white light, while the color produced by low-pressure lights is yellow to orange. High-pressure sodium lights are more popular than low-pressure lights because of this significant color difference.. ...
Excessive exposure to blue light has also been shown to be harmful to the eyes. The short wavelength of the blue light is very energy-intensive for the eyes. Some studies have shown that the blue light causes damage to the retina and the macula. There are even doctors talking about a generation of macular degeneration due to excessive screen exposure. Worth adding are our childrens eyes are even more sensitive to blue light.. My solutions. • Be sure to get more natural light to restore the natural rythm. Be sure to go out when it is sunny. I usually try to catch some morning sun if possible.. • Reduce screen and TV time. Get fixed routines about how much screen time you allow yourself.. • Block blue light with glasses and screen filters. Blue blocking glasses are something I use every day especially in the afternoon. There are many apps that can help reduce the blue light from mobile phone or computer. I use F.lux on my computer and always have the mobile in night-shift mode. • Replace ...
Embodiments of the present invention relate to holographically illuminated imaging devices including a holographic element for transforming an illumination beam into a focal array of light spots, a scanning mechanism for moving an object across one or more light spots in the focal array of light spots, and a light detector for detecting light associated with the focal array of light spots and generating light data associated with the received light.
neat concept, although it seems the closing is entirely counter-productive day or night.. efficient street lights should always point down, with no light lost in the upward direction, which causes light pollution.. likewise, efficient solar panels should never really "close up," just follow the direction of the sun.. so basically if the tops of these street lights were more like stationary orbs, or slightly flattened orbs, where the upper hemispheres collect light and the lower hemispheres distribute light, then a portion of the solar collectors would always be facing the sun during the day, and light would radiate downward and outward at night. ...
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