Search results for "Circadian system"

showing 6 items of 6 documents

An experimental study on relationship between LED lamp characteristics and non image-forming

2017

The general aim of the experimental study, presented in this paper, was that to investigate the relationship between the characteristics of five different types of LED (Light Emitting Diode) lamps, which are nowadays those allowing the highest energy consumption reduction, and the humans non image-forming (NIF) reactions.

EngineeringEnvironmental Engineering0211 other engineering and technologiesEnergy Engineering and Power Technology02 engineering and technologySettore ING-INF/01 - ElettronicaIndustrial and Manufacturing EngineeringLed lamplaw.inventionReduction (complexity)03 medical and health sciences0302 clinical medicinelawCircadian system021105 building & constructionElectrical and Electronic EngineeringLightingSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryElectrical engineeringEnergy consumptionSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaLED lampOptoelectronicsbusiness030217 neurology & neurosurgeryLighting colorLight-emitting diode2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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Winter and summer analysis of daylight characteristics in offices

2014

Abstract This paper reports a comparison of the results of daylight measurements carried out in summer and winter in three offices, with different exposures and characteristics, located in Naples (Italy). The aim was to extend and enrich the findings of a previous study which reported the results of summer measurements about desk illuminances and circadian impact. The research project includes measurements carried out in other seasons and a comparison between measured and software simulated values with the final goal of developing design guidelines. This research confirmed that the spectral distributions and CCTs of the light reaching the eye of a person seated at the desk in these offices …

Environmental EngineeringMeteorologymedia_common.quotation_subjectGeography Planning and DevelopmentBuilding and ConstructionSkyCircadian systemSettore ING-IND/10 - Fisica Tecnica IndustrialeEnvironmental scienceDaylightDaylightSPDDeskmedia_commonCivil and Structural EngineeringLight quality
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Indoor artificial lighting: Prediction of the circadian effects of different spectral power distributions.

2014

The study presented in this paper aims to evaluate if and how the environment affects the circadian impact of a light source by predicting circadian stimulus (CS) resulting from the exposure to different light scenes, using equations reported in studies by Rea et al. The main findings are: (1) Above 600 lx at eye level the increase of CS is little; (2) Between 50 lx and 200 lx at the eye level an increase of only 50 lx determines a significant increase of CS; (3) Light sources with correlated colour temperatures between 2900 K and 4200 K have similar impacts on the circadian system according to the calculation method used; (4) Even an almost neutral environment affects the circadian impact…

Light sourceArtificial lightcircadian stimulus spectral power distribution circadian systemComputer scienceMELATONIN CLOCK PHOTOTRANSDUCTION PHOTORECEPTORS MELANOPSIN RHYTHMS HUMANS ROD circadian effects SPDs light sources non visual effectsAcousticsCircadian rhythmElectrical and Electronic EngineeringStimulus (physiology)RETINAL GANGLION-CELLS SYSTEMElectrical and Electronic Engineering circadian rhythmSimulation
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Phosphodiesterase 10A in the Rat Pineal Gland: Localization, Daily and Seasonal Regulation of Expression and Influence on Signal Transduction

2010

The cyclic nucleotide phosphodiesterase 10A (PDE10A) is highly expressed in striatal spiny projection neurons and represents a therapeutic target for the treatment of psychotic symptoms. As reported previously [J Biol Chem 2009; 284:7606–7622], in this study PDE10A was seen to be additionally expressed in the pineal gland where the levels of PDE10A transcript display daily changes. As with the transcript, the amount of PDE10A protein was found to be under daily and seasonal regulation. The observed cyclicity in the amount of PDE10A mRNA persists under constant darkness, is blocked by constant light and is modulated by the lighting regime. It therefore appears to be driven by the master cloc…

Malemedicine.medical_specialtyAANATPhosphodiesterase InhibitorsEndocrinology Diabetes and MetabolismBlotting WesternBiologyReal-Time Polymerase Chain ReactionPineal GlandRats Sprague-DawleyCellular and Molecular NeurosciencePineal glandEndocrinologyOrgan Culture TechniquesInternal medicinePapaverinemedicineCyclic AMPAnimalsImmunoprecipitationProtein kinase A signalingCyclic GMPDNA PrimersPhosphodiesterase 10A;Circadian system;Pineal gland;Norepinephrine;cAMP;cGMP;Arylalkylamine N-acetyltransferaseEndocrine and Autonomic SystemsSuprachiasmatic nucleusPhosphoric Diester HydrolasesPhosphodiesteraseImmunohistochemistryCircadian RhythmRatsddc:medicine.anatomical_structureEndocrinologySecond messenger systemRNAFemaleSuprachiasmatic NucleusPDE10ASeasonsSignal transductionAdrenergic alpha-AgonistsSignal Transduction
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Study of Influence of the LED Technologies on Visual and Subjective/Individual Aspects

2018

The general aim of this paper is that to further deepen and elaborate the results obtained in a previous study of the authors, in which the relationship between the characteristics of five different types of LED lamps and the humans non-image-forming reactions were investigated, by conducting a more detailed statistical analysis and by highlighting the neurological aspects.

Settore ING-IND/11 - Fisica Tecnica Ambientalelightingbusiness.industryComputer science0211 other engineering and technologiesled lamp02 engineering and technologySettore ING-INF/01 - ElettronicaIndustrial engineeringVisualizationlaw.inventionSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaLED lamp03 medical and health sciencesMarket research0302 clinical medicinelaw021105 building & constructioncircadian systemlighting colorStatistical analysisStatistical dispersionbusiness030217 neurology & neurosurgery2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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Effects of daylight and artificial light on melatonin suppression in educational environment.

2012

An analysis of the characteristics of daylight in a scholastic environment was carried out by comparing SPDs and CCTs of the natural source (sky) during typical winter days with contemporaneous measurements of spectral irradiances and CCTs detected at the eyes level. Data obtained from these measurements together with those detected with artificial light, were used to evaluate the effects on melatonin suppression during the day according to the procedure proposed by Rea et al [2]. Despite illuminances on desks under natural and artificial light corresponded to the EN 12464-1 Standard requirements, the irradiances detected at eye's level, which are essential for melatonin suppression, do not…

circadian system melatonin suppressionSettore ING-IND/10 - Fisica Tecnica Industriale
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