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Volf C, Petersen PM, Thorseth A, Vestergaard S, Martiny K. Daylight quality: high-transmittance glass versus low transmittance glass - effects on daylight quality, health, comfort and energy consumption. Ann Med 2024; 56:2297273. [PMID: 38316028 PMCID: PMC10846434 DOI: 10.1080/07853890.2023.2297273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 12/15/2023] [Indexed: 02/07/2024] Open
Abstract
Introduction: This study investigated the health effects of two different architectural glass types: A two-layered low-iron high transmittance glass and a three-layered low energy glass with lower transmittance. The study investigated how these glass types affected daylight conditions in 72 residential apartments, as well as health and satisfaction of the residents.Methods: The study installed high transmittance glass (light transmittance LT:0.82) in 36 apartments and low transmittance (LT:0.74) in 36 identical apartments. The study then analyzed the light transmittance of each glass type in the laboratory and analyzed the indoor environmental quality (IEQ) in eight representative apartments before and after renovation. Self-reported questionnaires were handed out and collected before and after renovation.Results: The results showed that the glass types differed significantly in measured daylight transmittance. The two-layered high transmittance glass transmitted 15% more visual light (380-750 nm) and 20% more light in the spectral range (460-480 nm), stimulating ipRGCs and circadian rhythm, when compared to three-layered low energy glass. In addition, significant differences were observed in the UV-B spectrum (280-315 nm). While two-layered high transmittance glass transmitted UV-B, three-layered low transmittance glass did not. During the 12-month study period, residents in apartments with three-layered low energy glass reported more difficulties sleeping (p = 0.05), higher satisfaction with daylight (p = 0.03) and higher satisfaction with ventilation (p = 0.04). Residents in apartments with three-layered low energy glass experienced fewer days with too cold indoor temperatures (p = 0.02), compared to residents with two-layered low-iron glass. The results of energy consumption for heating showed that two-layered low-iron glass reduced the energy consumption by 11.0%, while three-layered low energy glass reduced the energy consumption by 9.4%, compared to the year prior to renovation.Conclusion: The results contribute to a discussion about potential energy savings on one hand and potential non-energy benefits, such as daylight quality, overall health, and total economy/life cycle assessment of the built environment on the other hand. The results suggest further research performed in randomized large-scale studies.
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Affiliation(s)
- Carlo Volf
- New Interventions in Depression (NID) Group, Mental Health Center Copenhagen, Copenhagen, Denmark
| | | | - Anders Thorseth
- DTU Electro, Technical University of Denmark, Roskilde, Denmark
| | | | - Klaus Martiny
- New Interventions in Depression (NID) Group, Mental Health Center Copenhagen, Copenhagen, Denmark
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Maule JJ, Maguire R, Timmis MA, Runswick OR, Wilkins L, Mann DL, Dain SJ, Bosten JM, Allen PM. Difficult at dusk? Illuminating the debate on cricket ball visibility. J Sci Med Sport 2024:S1440-2440(24)00052-5. [PMID: 38423830 DOI: 10.1016/j.jsams.2024.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 12/20/2023] [Accepted: 02/09/2024] [Indexed: 03/02/2024]
Abstract
OBJECTIVES Investigate the visibility of new and old red, white and pink cricket balls under lighting and background conditions experienced during a day-night cricket match. DESIGN We modelled the luminance contrast signals available for a typical observer for a ball against backgrounds in a professional cricket ground, at different times of day. METHODS Spectral reflectance (light reflected as a function of wavelength) was derived from laboratory measurements of new and old red, white and pink balls. We also gathered spectral measurements from backgrounds (pitch, grass, sightscreens, crowd, sky) and spectral illuminance during a day-night match (natural afternoon light, through dusk to night under floodlights) from Lord's Cricket Ground (London, UK). The luminance contrast of the ball relative to the background was calculated for each combination of ball, time of day, and background surface. RESULTS Old red and old pink balls may offer little or no contrast against the grass, pitch and crowd. New pink balls can also be of low contrast against the crowd at dusk, as can pink and white balls (of any age) against the sky at dusk. CONCLUSIONS Reports of difficulties with visibility of the pink ball are supported by our data. However, our modelling also shows that difficulties with visibility may also be expected under certain circumstances for red and white balls. The variable conditions in a cricket ground and the changing colour of an ageing ball make maintaining good visibility of the ball a challenge when playing day-night matches.
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Affiliation(s)
| | - Robert Maguire
- Vision and Hearing Sciences Research Centre, Anglia Ruskin University, UK
| | - Matthew A Timmis
- Cambridge Centre for Sport and Exercise Sciences, Anglia Ruskin University, UK
| | - Oliver R Runswick
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - Luke Wilkins
- Sport, Performance, and Nutrition (SPAN) Research Group, La Trobe University, Australia
| | - David L Mann
- Department of Human Movement Sciences, Amsterdam Movement Sciences and Institute of Brain and Behaviour Amsterdam, Vrije Universiteit Amsterdam, the Netherlands
| | - Stephen J Dain
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | | | - Peter M Allen
- Vision and Hearing Sciences Research Centre, Anglia Ruskin University, UK
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Raza A, Partonen T, Hanson LM, Asp M, Engström E, Westerlund H, Halonen JI. Daylight during winters and symptoms of depression and sleep problems: A within-individual analysis. Environ Int 2024; 183:108413. [PMID: 38171042 DOI: 10.1016/j.envint.2023.108413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 11/23/2023] [Accepted: 12/29/2023] [Indexed: 01/05/2024]
Abstract
BACKGROUND With climate change Northern areas of the globe are expected to have less daylight during winters due to less snow and more cloudiness. While wintertime has been linked to mental health problems, the role of wintertime daylight has been scarcely studied. We examined longitudinal associations for wintertime objective exposure to global radiation and self-reported daylight exposure with symptoms of depression and sleep problems. METHODS Our analytical sample included 15,619 respondents from three Swedish Longitudinal Occupational Surveys of Health (2012, 2014 and 2016). Objective exposure was global radiation (MJ/m2, November-January and November-February). Subjective exposure was based on self-reported time spent outdoors in daylight (<1 h vs. ≥ 1 h, November-January). Symptoms of depression were evaluated using a six-item subscale of the (Hopkins) Symptom Checklist. Fixed-effects method with conditional logistic regression controlled for time-invariant participant characteristics by design and time-varying covariates were added into models. RESULTS One unit increase in the four-month averaged global radiation was associated with lower odds of depressive symptoms (OR 0.69, 95 % CI 0.52-0.91). These findings were confirmed using four-month cumulative exposure (OR 0.91, 95 % CI 0.85-0.98). Individuals reporting ≥ 1 h exposure to daylight during winter months were less likely to report depressive symptoms (OR 0.72, 95 % CI 0.60-0.82) compared to time when their exposure was < 1 h. Higher three-month exposure to global radiation suggested a protective association for sleep problems. CONCLUSION These findings suggest that higher exposure to daylight during winters may contribute to lower likelihood of depression symptoms.
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Affiliation(s)
- Auriba Raza
- Stress Research Institute, Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden.
| | - Timo Partonen
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland
| | - Linda Magnusson Hanson
- Stress Research Institute, Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Magnus Asp
- Department of Community Planning Services, Swedish Meteorological and Hydrological Institute, SE-601 76 Norrköping, Sweden
| | - Erik Engström
- Department of Community Planning Services, Swedish Meteorological and Hydrological Institute, SE-601 76 Norrköping, Sweden
| | - Hugo Westerlund
- Stress Research Institute, Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jaana I Halonen
- Stress Research Institute, Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden; Department of Health Security, Finnish Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland
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Zach H, Retter D, Schmoeger M, Rommer P, Willinger U, Schwarz FK, Wiest G. Seasonality of benign paroxysmal positional vertigo : A retrospective study from Central Europe. Wien Klin Wochenschr 2024; 136:25-31. [PMID: 37405489 PMCID: PMC10776474 DOI: 10.1007/s00508-023-02237-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 05/30/2023] [Indexed: 07/06/2023]
Abstract
BACKGROUND Although benign paroxysmal positional vertigo (BPPV) is the most common cause of vertigo in clinical practice, factors influencing the pathophysiology remain not fully understood. OBJECTIVE Here we aim to investigate possible seasonal influences on the occurrence of BPPV in Vienna, a city located in a Central European country with pronounced seasonal fluctuations. METHODS We retrospectively investigated data from 503 patients presenting with BPPV to the outpatient clinics of the Medical University of Vienna between 2007 and 2012. Analyses included age, gender, type of BPPV, seasonal assignment, as well as daylight hours and the temperature in Vienna at symptom onset. RESULTS Out of 503 patients (159 male, 344 female, ratio 1:2.2; mean age 60 ± 15.80 years), most patients presented with posterior (89.7%) and left-sided (43.1%) BPPV. There was a significant seasonal difference (χ2 p = 0.036) with the majority of symptoms occurring in winter seasons (n = 142), followed by springtime (n = 139). Symptom onset did not correlate with the average temperature (p = 0.24) but on the other hand very well with daylight hours (p < 0.05), which ranged from 8.4 h per day in December, to an average of 15.6 h in July. CONCLUSION Our results show a seasonal accumulation of BPPV during winter and springtime, which is in line with previous studies from other climatic zones, suggesting an association of this seasonality with varying vitamin D levels.
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Affiliation(s)
- Heidemarie Zach
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - David Retter
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - Michaela Schmoeger
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - Paulus Rommer
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - Ulrike Willinger
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - Felix K Schwarz
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria
| | - Gerald Wiest
- Neurotology Outpatient Clinic, Dept. of Neurology, Medical University of Vienna, Waehringerguertel 18-20, 1090, Vienna, Austria.
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Beute F, Aries MB. The importance of residential dusk and dawn light exposure for sleep quality, health, and well-being. Sleep Med Rev 2023; 72:101865. [PMID: 37864914 DOI: 10.1016/j.smrv.2023.101865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 10/06/2023] [Accepted: 10/10/2023] [Indexed: 10/23/2023]
Abstract
Light exposure during twilight plays a critical role in the entrainment of the human circadian system. People are most often at home during dusk and dawn, and light exposure at home - either natural or from electric light - may therefore contribute substantially to sleep and well-being. However, very little research has focused on the effects of home lighting on sleep and well-being, and even less research has investigated the effects of light exposure during twilight. Therefore, a literature study was performed to collect studies on light exposure at home during dusk and dawn. Studies looking at light exposure during dusk and dawn have focused on either electric light intervention (i.e., dusk and dawn simulation) at home or in the laboratory or daylight exposure in the bedroom (i.e., the presence and type of curtains in the bedroom). Most research has focused on dawn simulation during the darker months of the year, often using sunrise alarms. In general, study results pointed to the importance of twilight light exposure at home for sleep and well-being. These results may depend on the characteristics of the user, such as age or chronotype.
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Affiliation(s)
| | - Myriam Bc Aries
- Jönköping University, School of Engineering, Jönköping, Sweden.
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Ghaeili Ardabili N, Wang J, Wang N. A systematic literature review: building window's influence on indoor circadian health. Renew Sustain Energy Rev 2023; 188:113796. [PMID: 37927424 PMCID: PMC10621328 DOI: 10.1016/j.rser.2023.113796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
Light has been shown to have a non-visual impact on the biological aspects of human health, particularly on circadian rhythms. Building windows are a potential means of regulating daylight conditions for circadian health and well-being. As a result of advancements in window and glazing technologies and variations in outdoor solar/sky conditions, understanding daylight's spectral characteristics, which pass through building window systems, is complex. Therefore, a systematic review and summary of the knowledge and evidence available regarding windows' impact on human circadian health is necessary. This study provides an overview of research in this domain, compares approaches and evaluation metrics, and underscores the importance of window parameters' influence on circadian health. Published studies available on various online databases since 2012 were evaluated. The findings of this study define a holistic approach to the melanopic performance of windows and provide an overview of current knowledge regarding the effect of windows on circadian health. Additionally, this work identifies future research directions based on the studies reviewed. This research contributes to the growing body of knowledge on the impact of windows on circadian health, which has implications for the design and construction of buildings in ways that support indoor human health and well-being from the circadian light adequacy perspective.
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Affiliation(s)
- N. Ghaeili Ardabili
- Department of Architectural Engineering, Pennsylvania State University, State College (USA)
| | - J. Wang
- Department of Architectural Engineering, Pennsylvania State University, State College (USA)
| | - N. Wang
- Department of Architectural Engineering, Pennsylvania State University, State College (USA)
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Hossain A, Sun X, Islam S, Alam S, Mahmud Hossain M. Identifying roadway departure crash patterns on rural two-lane highways under different lighting conditions: Association knowledge using data mining approach. J Safety Res 2023; 85:52-65. [PMID: 37330901 DOI: 10.1016/j.jsr.2023.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 10/03/2022] [Accepted: 01/17/2023] [Indexed: 06/19/2023]
Abstract
INTRODUCTION More than half of all fatalities on U.S. highways occur due to roadway departure (RwD) each year. Previous research has explored various risk factors that contribute to RwD crashes, however, a comprehensive investigation considering the effect of lighting conditions has been insufficiently addressed. DATA Using the Louisiana Department of Transportation and Development crash database, fatal and injury RwD crashes occurring on rural two-lane (R2L) highways between 2008-2017 were analyzed based on daylight and dark (with and without streetlight). METHOD This research employed a safe system approach to explore meaningful complex interactions among multidimensional crash risk factors. To accomplish this, an unsupervised data mining algorithm association rules mining (ARM) was utilized. RESULTS AND CONCLUSIONS Based on the generated rules, the findings reveal several interesting crash patterns in the daylight, dark-with-streetlight, and dark-no-streetlight, emphasizing the importance of investigating RwD crash patterns depending on the lighting conditions. In daylight condition, fatal RwD crashes are associated with cloudy weather conditions, distracted drivers, standing water on the roadway, no seat belt use, and construction zones. In dark lighting condition (with and without streetlight), the majority of the RwD crashes are associated with alcohol/drug involvement, young drivers (15-24 years), driver condition (e.g., inattentive, distracted, illness/fatigued/asleep), and colliding with animal(s). PRACTICAL APPLICATIONS The findings also reveal how certain driver behavior patterns are connected to RwD crashes, such as a strong association between alcohol/drug intoxication and no seat belt usage in the dark-no-streetlight condition. Based on the identified crash patterns and behavioral characteristics under different lighting conditions, the findings could aid researchers and safety specialists in developing the most effective RwD crash mitigation strategies.
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Affiliation(s)
- Ahmed Hossain
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA.
| | - Xiaoduan Sun
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA
| | - Shahrin Islam
- Department of Civil Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka 1000, Bangladesh
| | - Shah Alam
- Department of Civil Engineering, Rajshahi Science and Technology University, Natore 6400, Rajshahi, Bangladesh
| | - Md Mahmud Hossain
- Department of Civil and Environmental Engineering, Auburn University, Auburn 36849, AL, USA
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Jafarifiroozabadi R, Joseph A, Bridges W, Franks A. The impact of daylight and window views on length of stay among patients with heart disease: A retrospective study in a cardiac intensive care unit. J Intensive Med 2023; 3:155-164. [PMID: 37188123 PMCID: PMC10175739 DOI: 10.1016/j.jointm.2022.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 11/01/2022] [Accepted: 11/11/2022] [Indexed: 05/17/2023]
Abstract
Background Heart disease is the leading cause of death in the United States. The length of stay (LOS) is a well-established parameter used to evaluate health outcomes among critically ill patients with heart disease in cardiac intensive care units (CICUs). While evidence suggests that the presence of daylight and window views can positively influence patients' LOS, no studies to date have differentiated the impact of daylight from window views on heart disease patients. Also, existing research studies on the impact of daylight and window views have failed to account for key clinical and demographic variables that can impact the benefit of such interventions in CICUs. Methods This retrospective study investigated the impact of access to daylight vs. window views on CICU patients' LOS. The study CICU is located in a hospital in the southeast United States and has rooms of the same size with different types of access to daylight and window views, including rooms with daylight and window views (with the patient bed located parallel to full-height, south-facing windows), rooms with daylight and no window views (with the patient bed located perpendicular to the windows), and windowless rooms. Data from electronic health records (EHRs) for the time-period September 2015 to September 2019 (n=2936) were analyzed to investigate the impact of room type on patients' CICU LOS. Linear regression models were developed for the outcome of interest, controlling for potential confounding variables. Results Ultimately, 2319 patients were finally included in the study analysis. Findings indicated that patients receiving mechanical ventilation in rooms with access to daylight and window views had shorter LOS durations (16.8 h) than those in windowless rooms. Sensitivity analysis for a subset of patients with LOS ≤3 days revealed that parallel bed placement to the windows and providing access to both daylight and window views significantly reduced their LOS compared to windowless rooms in the unit (P=0.007). Also, parallel bed placement to the window significantly reduced LOS in this patient subset for those with an experience of delirium (P=0.019), dementia (P=0.008), anxiety history (P=0.009), obesity (P=0.003), and those receiving palliative care (P=0.006) or mechanical ventilation (P=0.033). Conclusions Findings from this study could help architects make design decisions and determine optimal CICU room layouts. Identifying the patients who benefit most from direct access to daylight and window views may also help CICU stakeholders with patient assignments and hospital training programs.
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Affiliation(s)
- Roxana Jafarifiroozabadi
- College of Architecture and Design, Lawrence Technological University, Southfield, MI 48075, USA
- Corresponding author: Roxana Jafarifiroozabadi, Lawrence Technological University, Southfield, MI 48075, USA.
| | - Anjali Joseph
- Spartanburg Regional Healthcare System Endowed Chair in Architecture + Health Design, Clemson University, Clemson, SC 29634, USA
- Center for Health Facilities Design and Testing, Clemson University, Clemson, SC 29634, USA
- School of Architecture, Clemson University, Clemson, SC 29634, USA
- Industrial Engineering, Clemson University, Clemson, SC 29634, USA
| | - William Bridges
- School of Mathematical and Statistical Sciences, Clemson University, Clemson, SC 29634, USA
| | - Andrea Franks
- Clinical and Nursing Research, AnMed Health, Anderson, SC 29621, USA
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Hammes S, Weninger J. Measurement data on the window opening behavior and climate in a strongly daylit office building. Data Brief 2023; 46:108794. [PMID: 36569536 PMCID: PMC9772800 DOI: 10.1016/j.dib.2022.108794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/22/2022] [Accepted: 11/23/2022] [Indexed: 11/30/2022] Open
Abstract
The long-term measurement data presented in this article result were collected in a strongly daylit office building under real working conditions and include temperature and wind speed of the outdoor situation as well as climatic variables of the indoor space, such as temperature and relative humidity. In addition to the measurement of environmental variables, the window opening behavior was also logged. The entire data acquisition was implemented via the building control system and was performed with a one-minute resolution. An exception to this is the recording of the window openings, which were logged on change of state. The measurement data obtained can be combined with other measurement data to provide an improved data basis for energy building simulations, prediction models and energy potential assessments.
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Affiliation(s)
- Sascha Hammes
- Unit of Energy Efficient Building, University of Innsbruck, 6020 Innsbruck, Austria
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Ruiz AJ, LaRochelle EPM, Samkoe KS, Chapman MS, Pogue BW. Effective fluence and dose at skin depth of daylight and lamp sources for PpIX-based photodynamic therapy. Photodiagnosis Photodyn Ther 2023; 41:103260. [PMID: 36627070 DOI: 10.1016/j.pdpdt.2022.103260] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 12/28/2022] [Indexed: 01/09/2023]
Abstract
SIGNIFICANCE Skin-based photodynamic therapy (PDT) is used for the clinical treatment of actinic keratosis (AKs) and other skin lesions with continued expansion into the standard of care. Due to the spectral dependency of photosensitizer activation and skin optical fluence, there is a need for more accurate methods to estimate the delivered dose at depth from different PDT light sources and treatment regimens. AIM Develop radiometric methods for calculating photosensitizer-effective fluence and dose at depth and determine differences between red-lamp, blue-lamp, and daylight-based PDT treatments. METHODS Radiometric measurements of FDA-approved PDT lamp sources, outdoor daylight, and indoor daylight were performed for clinically relevant AK treatments. The protoporphyrin IX (PpIX) equivalent irradiance, fluence, and dose for each light source were calculated from the PpIX absorption spectrum and a 7-layer skin fluence model. The effective fluence and dose at depth was estimated by combining the spectral attenuation predicted at each wavelength and depth with the source fluence at each wavelength. RESULTS The red-lamp source had the highest illuminance (112,000 lumen/m2), but lowest PpIX-effective irradiance (9.6 W/m2), and highest effective fluence at depth (10.8 W/m2 at 500 µm). In contrast, the blue light source had the lowest illuminance (2300 lumen/m2), but highest PpIX effective irradiance (37.0 W/m2), and ultimately the lowest effective fluence at depth (0.18 W/cm2 at 500 µm). The daylight source had values of (outdoor | indoor) illuminance of (49,200 | 37,800 lumen/m2), effective irradiance of (19.2 | 10.7 W/m2), and effective fluence of (1.50 | 1.08 W/m2 at 500 µm). The effective fluence and dose at depth facilitated the comparison of treatment regimens, for example, calculating an equivalent dose for a 2 hr indoor daylight treatment and a 10 min red-light treatment for the 300-1000 μm depth range. CONCLUSIONS The consideration of PpIX-effective fluence at varying depths is necessary to provide adequate comparisons of the delivered dose from PDT light sources. Methods for calculating radiometric fluence and delivered dose at depth were introduced, with open source MATLAB code, to help overcome the limitations of commonly used photometric and irradiance-based reporting.
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Affiliation(s)
- Alberto J Ruiz
- Dartmouth Engineering, 15 Thayer Drive, Hanover, NH 03755, USA; QUEL Imaging, LLC, White River Junction, VT 0500, USA.
| | | | | | - M Shane Chapman
- Department of Dermatology, Dartmouth Hitchcock Medical Center, Lebanon, NH 03766, USA
| | - Brian W Pogue
- Dartmouth Engineering, 15 Thayer Drive, Hanover, NH 03755, USA; Department of Medical Physics, University of Wisconsin-Madison, Madison, WI 53715, USA
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Burns AC, Saxena R, Vetter C, Phillips AJK, Lane JM, Cain SW. Time spent in outdoor light is associated with mood, sleep, and circadian rhythm-related outcomes: A cross-sectional and longitudinal study in over 400,000 UK Biobank participants. J Affect Disord 2021; 295:347-352. [PMID: 34488088 PMCID: PMC8892387 DOI: 10.1016/j.jad.2021.08.056] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 07/29/2021] [Accepted: 08/21/2021] [Indexed: 01/27/2023]
Abstract
BACKGROUND Light has powerful effects on mood, sleep, and the circadian system. Humans evolved in an environment with a clear distinction between day and night, but our modern environments have blurred this distinction. Negative effects of light exposure at night have been well characterized. The importance of daytime light exposure has been less well characterized. Here we examine the cross-sectional and longitudinal associations of time spent in daytime outdoor light with mood, sleep, and circadian-related outcomes. METHODS Participants were drawn from the UK Biobank cohort, a large study of UK adults (n = 502,000; 37-73 years old; 54% women). RESULTS UK Biobank participants reported spending a median of 2.5 daylight hours (IQR = 1.5-3.5 h) outdoors per day. Each additional hour spent outdoors during the day was associated with lower odds of lifetime major depressive disorder (95% CI OR:0.92-0.98), antidepressant usage (OR:0.92-0.98), less frequent anhedonia (OR:0.93-0.96) and low mood (OR:0.87-0.90), greater happiness (OR:1.41-1.48) and lower neuroticism (incident rate ratio, IRR:0.95-0.96), independent of demographic, lifestyle, and employment covariates. In addition, each hour of daytime light was associated with greater ease of getting up (OR:1.46-1.49), less frequent tiredness (OR:0.80-0.82), fewer insomnia symptoms (OR:0.94-0.97), and earlier chronotype (adjusted odds ratio; OR:0.75-0.77). Auto-Regressive Cross-Lagged (ARCL) models were used to examine the longitudinal association of time spent in outdoor light at baseline with later mood-, sleep- and circadian-related outcomes reported at time point 2. Overall, longitudinal associations support cross-sectional findings, though generally with smaller effect sizes. LIMITATIONS Future studies that examine the intensity of daytime light exposure at the ocular level are needed. CONCLUSIONS Our findings suggest that low daytime light exposure is an important environmental risk factor for mood, sleep, and circadian-related outcomes.
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Affiliation(s)
- Angus C Burns
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Melbourne, VIC, Australia
| | - Richa Saxena
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Boston, MA USA; Medical and Population Genetics, Broad Institute, Cambridge, MA USA; The Division of Sleep and Circadian Disorders, Brigham and Women's Hospital, Boston, MA USA
| | - Céline Vetter
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - Andrew J K Phillips
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Melbourne, VIC, Australia
| | - Jacqueline M Lane
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Boston, MA USA; Medical and Population Genetics, Broad Institute, Cambridge, MA USA; The Division of Sleep and Circadian Disorders, Brigham and Women's Hospital, Boston, MA USA
| | - Sean W Cain
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Melbourne, VIC, Australia.
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12
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Golvani J, Roos L, Henricson M. Operating room nurses' experiences of limited access to daylight in the workplace - a qualitative interview study. BMC Nurs 2021; 20:227. [PMID: 34753467 DOI: 10.1186/s12912-021-00751-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 10/29/2021] [Indexed: 12/03/2022] Open
Abstract
Background The operating room nurse is, among other things, responsible for patient safety and maintaining an aseptic environment. For hygienic reasons unnecessary traffic in the operating room should be avoided, which may mean that the operating room nurse works long shifts without relief. Operating departments are usually separated, where there might be no daylight opportunities in the operating room. The purpose of the study was to describe operating room nurses’ experiences of limited access to daylight in the workplace. Method Qualitative design with four semi-structured focus groups of totally 15 operating room nurses. The analysis was performed with a content analysis with an inductive approach. Results The study generated two main categories, difference in light and contact with the outer world. Operating room nurses felt that daylight affected them differently from the light from lamps, where daylight was considered important for experiencing well-being. Daylight could lead to a sensation of joy but also increased awareness and energy which seemed to improve the ability to perform at work. The limited access to daylight contributed to fatigue and led to an internal stress that affected the nurses even after work. Having opportunities to look out through windows under a workday was important to experience contact with the outside world and created a sense of time. Conclusion To look out can reduce the feeling of being trapped in the closed context that the operating department entails. It can also lead to increased well-being and comfort in the workplace. We consider that daylight is an important component in the physical work environment that needs to be taken into consideration in further research as well as in new construction of operations departments.
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O'Mahoney P, Khazova M, LaRochelle E, Pogue B, Ibbotson SH, Eadie E. Global verification of a model for determining daylight photodynamic therapy dose. Photodiagnosis Photodyn Ther 2021; 34:102260. [PMID: 33781909 DOI: 10.1016/j.pdpdt.2021.102260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 10/21/2022]
Abstract
Daylight photodynamic therapy is an effective treatment for actinic keratoses and relies on a minimum PpIX-effective light exposure dose being delivered during treatment. As such, daylight dosimetry is an important aspect of this treatment. Relatively simple measurements of illuminance may be converted to PpIX-effective irradiance, and subsequently exposure dose, via a conversion model (the O'Mahoney model). This model has been verified against spectral irradiance data from the UK, however the accuracy of the model has not been determined outside the UK. In this work, we test the O'Mahoney model against spectral irradiance measurements from several global locations to within bounds of a median deviation of ±10 %. The median percentage deviations are shown to be independent of location latitude and longitude. The model can be used confidently to determine PpIX-effective irradiance from illuminance measurements irrespective of location and can be widely implemented as an effective and low-cost means of accurately measuring effective light exposure for this important treatment.
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Affiliation(s)
- Paul O'Mahoney
- School of Medicine, University of Dundee, Dundee, UK; Photobiology Unit, NHS Tayside, Dundee, UK; The Scottish Photodynamic Therapy Centre, Dundee, UK.
| | | | | | - Brian Pogue
- Thayer School of Engineering at Dartmouth, Hanover, NH, USA.
| | - Sally H Ibbotson
- School of Medicine, University of Dundee, Dundee, UK; Photobiology Unit, NHS Tayside, Dundee, UK; The Scottish Photodynamic Therapy Centre, Dundee, UK.
| | - Ewan Eadie
- Photobiology Unit, NHS Tayside, Dundee, UK; The Scottish Photodynamic Therapy Centre, Dundee, UK.
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14
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Andreadis D, Pavlou AM, Vakirlis E, Anagnostou E, Vrani F, Poulopoulos A, Kolokotronis A, Ioannidis D, Sotiriou E. Daylight photodynamic therapy for the management of actinic cheilitis. Arch Dermatol Res 2020; 312:731-737. [PMID: 32266532 DOI: 10.1007/s00403-020-02069-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 03/30/2020] [Indexed: 12/20/2022]
Abstract
Early identification and adequate treatment of actinic cheilitis (AC), which affects the lower lip vermillion and is considered a precursor of squamous cell carcinoma, is mandatory. Photodynamic therapy (PDT) has been successfully used in AC. PDT with the use of daylight (DLPDT) is equally effective and more convenient than the conventional PDT. Data on short and long-term efficacy of DLPDT in AC are limited. Our primary purpose was to assess efficacy of DLPDT in AC as well as safety and tolerance. Twenty-two individuals with histologically confirmed AC received 2 MAL (5-aminolevulinic acid)-DLPDT sessions 1 week apart. Patients were evaluated clinically 3, 6, and 12 months after treatment. Non-complete responders were biopsied and excluded from the study if histological alterations were indicative of AC. Adverse events were recorded from baseline to the end of the 12-month follow-up period. Twenty patients completed the study. Overall, complete clinical response 12 months after treatment was 80% (16/20), while an association between treatment response and grade of dysplasia was observed (p = 0.016). With respect to response by grade, complete clinical response achieved in grade I AC was 100% (12/12) and 50% (4/8) in grade II AC. Main adverse events included mild erythema, oedema, and scaling, with no pain associated with DLPDT. According to our results, DLPDT seems to be of significant benefit for the treatment of grade I AC. Combination with the other treatment modalities could improve the efficacy in grade II AC. Further studies are needed for the assessment of late recurrences.
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Affiliation(s)
- Dimitrios Andreadis
- Department of Oral Medicine/Pathology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
| | - Achilleia -Maria Pavlou
- Department of Oral Medicine/Pathology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Efstratios Vakirlis
- First Dermatology Department, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Eleftherios Anagnostou
- Department of Oral Medicine/Pathology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Fotini Vrani
- First Dermatology Department, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Athanasios Poulopoulos
- Department of Oral Medicine/Pathology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Alexandros Kolokotronis
- Department of Oral Medicine/Pathology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Dimitrios Ioannidis
- First Dermatology Department, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Elena Sotiriou
- First Dermatology Department, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
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15
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Krüger EL, Tamura C, Trento TW. Identifying relationships between daylight variables and human preferences in a climate chamber. Sci Total Environ 2018; 642:1292-1302. [PMID: 30045509 DOI: 10.1016/j.scitotenv.2018.06.164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 05/02/2018] [Accepted: 06/13/2018] [Indexed: 06/08/2023]
Abstract
Interactions between human beings and the built environment are mediated by physiological and psychological stimuli, which may interfere in the perception and satisfaction related to indoor comfort variables. The study aims to explore the relationship between daylighting features and possible impacts on humans in regards to lighting preferences. The influence of different daylighting configurations, glazed façade orientation and season of the year on lighting preferences in human beings was evaluated by means of tests in a rotating climate with monitoring of environmental variables, developed by the Karlsruhe Institute of Technology, Karlsruhe, Germany. The sample, n = 16, is composed of German male students (height SD = 1.80 m, SD = 0.06; body weight SD = 80 kg, SD = 8.9; and age SD = 24.9 years, SD = 3.6). Under controlled thermal conditions (PMV approx. ±0.5), participants remained in two office-like environments over 5 h (8:00 am to 1:00 pm - local time) three days in a row, for three seasons of the year, totaling nine days of data collection per participant. Definitions of glazed façade orientations for the experimental rounds were done by means of computer simulations. Objective variables were measured by spectroradiometers at desk height, with sensor h = ca. 0.90 m, and comfortmeters. Preferences of daylighting features was assessed by a questionnaire with Likert-scale alternatives, administered online at 8:50 am, 10:30 am and 12:30 pm. Objective and subjective data were analyzed statistically (Spearman's rho, rs), suggesting possible correlations between lighting preferences and objective variables, including: E (lx), CCT (K), DWl (nm) and the circadian metric acv (circadian action factor).
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Affiliation(s)
- Eduardo L Krüger
- Departamento de Construção Civil, Universidade Tecnológica Federal do Paraná, Curitiba, Brazil.
| | - Cintia Tamura
- Universidade Tecnológica Federal do Paraná, Curitiba, Brazil
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16
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Fahimipour AK, Hartmann EM, Siemens A, Kline J, Levin DA, Wilson H, Betancourt-Román CM, Brown GZ, Fretz M, Northcutt D, Siemens KN, Huttenhower C, Green JL, Van Den Wymelenberg K. Daylight exposure modulates bacterial communities associated with household dust. Microbiome 2018; 6:175. [PMID: 30333051 PMCID: PMC6193304 DOI: 10.1186/s40168-018-0559-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 09/19/2018] [Indexed: 05/19/2023]
Abstract
BACKGROUND Microbial communities associated with indoor dust abound in the built environment. The transmission of sunlight through windows is a key building design consideration, but the effects of light exposure on dust communities remain unclear. We report results of an experiment and computational models designed to assess the effects of light exposure and wavelengths on the structure of the dust microbiome. Specifically, we placed household dust in replicate model "rooms" with windows that transmitted visible, ultraviolet, or no light and measured taxonomic compositions, absolute abundances, and viabilities of the resulting bacterial communities. RESULTS Light exposure per se led to lower abundances of viable bacteria and communities that were compositionally distinct from dark rooms, suggesting preferential inactivation of some microbes over others under daylighting conditions. Differences between communities experiencing visible and ultraviolet light wavelengths were relatively minor, manifesting primarily in abundances of dead human-derived taxa. Daylighting was associated with the loss of a few numerically dominant groups of related microorganisms and apparent increases in the abundances of some rare groups, suggesting that a small number of microorganisms may have exhibited modest population growth under lighting conditions. Although biological processes like population growth on dust could have generated these patterns, we also present an alternate statistical explanation using sampling models from ecology; simulations indicate that artefactual, apparent increases in the abundances of very rare taxa may be a null expectation following the selective inactivation of dominant microorganisms in a community. CONCLUSIONS Our experimental and simulation-based results indicate that dust contains living bacterial taxa that can be inactivated following changes in local abiotic conditions and suggest that the bactericidal potential of ordinary window-filtered sunlight may be similar to ultraviolet wavelengths across dosages that are relevant to real buildings.
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Affiliation(s)
- Ashkaan K. Fahimipour
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
| | - Erica M. Hartmann
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Department of Civil and Environmental Engineering, Northwestern University, Chicago, IL USA
| | - Andrew Siemens
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
| | - Jeff Kline
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Energy Studies in Buildings Laboratory, University of Oregon, Eugene, OR USA
| | - David A. Levin
- Department of Mathematics, University of Oregon, Eugene, OR USA
| | - Hannah Wilson
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
| | | | - GZ Brown
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Energy Studies in Buildings Laboratory, University of Oregon, Eugene, OR USA
| | - Mark Fretz
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Energy Studies in Buildings Laboratory, University of Oregon, Eugene, OR USA
| | - Dale Northcutt
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Energy Studies in Buildings Laboratory, University of Oregon, Eugene, OR USA
| | - Kyla N. Siemens
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
| | - Curtis Huttenhower
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA USA
| | - Jessica L. Green
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Santa Fe Institute, Santa Fe, NM USA
| | - Kevin Van Den Wymelenberg
- Biology and the Built Environment Center, University of Oregon, 13th Ave, Eugene, OR USA
- Energy Studies in Buildings Laboratory, University of Oregon, Eugene, OR USA
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17
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Uttley J, Fotios S. The effect of ambient light condition on road traffic collisions involving pedestrians on pedestrian crossings. Accid Anal Prev 2017; 108:189-200. [PMID: 28910684 DOI: 10.1016/j.aap.2017.09.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 08/22/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
Previous research suggests darkness increases the risk of a collision involving a pedestrian and the severity of any injury suffered. Pedestrian crossings are intended to make it safer to cross the road, but it is not clear whether they are effective at doing this after-dark, compared with during daylight. Biannual clock changes resulting from transitions to and from daylight saving time were used to compare RTCs in the UK during daylight and darkness but at the same time of day, thus controlling for potential influences on RTC numbers not related to the ambient light condition. Odds ratios and regression discontinuity analysis suggested there was a significantly greater risk of a pedestrian RTC at a crossing after-dark than during daylight. Results also suggested the risk of an RTC after-dark was greater at a pedestrian crossing than at a location at least 50m away from a crossing. Whilst these results show the increased danger to pedestrians using a designated crossing after-dark, this increased risk is not due to a lack of lighting at these locations as 98% of RTCs at pedestrian crossings after-dark were lit by road lighting. This raises questions about the adequacy and effectiveness of the lighting used at pedestrian crossings.
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Affiliation(s)
- Jim Uttley
- School of Architecture, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom.
| | - Steve Fotios
- School of Architecture, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom
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18
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Kohl E, Koller M, Zeman F, Szeimies RM, Philipp-Dormston WG, Prager W, Gerber PA, Karrer S. Daylight photodynamic therapy versus cryosurgery for the treatment and prophylaxis of actinic keratoses of the face - protocol of a multicenter, prospective, randomized, controlled, two-armed study. BMC Dermatol 2017; 17:12. [PMID: 29070025 PMCID: PMC5657041 DOI: 10.1186/s12895-017-0064-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 10/18/2017] [Indexed: 12/24/2022]
Abstract
BACKGROUND Photodynamic therapy with daylight (DL-PDT) is efficacious in treating actinic keratosis (AK), but the efficacy of field-directed, repetitive DL-PDT for the treatment and prophylaxis of AK in photodamaged facial skin has not yet been investigated. METHODS/DESIGN In this multicenter, prospective, randomized, controlled, two-armed, observer-blinded trial, patients with a minimum of 5 mild-to-moderate AK lesions on photodamaged facial skin are randomly allocated to two treatment groups: DL-PDT with methyl aminolevulinate (MAL) and cryosurgery. In the DL-PDT group (experimental group), 5 treatments of the entire face are conducted over the course of 18 months. After preparation of the lesion and within 30 min after MAL application, patients expose themselves to daylight for 2 h. In the control group, lesion-directed cryosurgery is conducted at the first visit and, in the case of uncleared or new AK lesions, also at visits 2 to 5. The efficacy of the treatment is evaluated at visits 2 to 6 by documenting all existing and new AK lesions in the face. Cosmetic results and improvement of photoaging parameters are evaluated by means of a modified Dover scale. Primary outcome parameter is the cumulative number of AK lesions observed between visits 2 and 6. Secondary outcome parameters are complete clearance of AK, new AK lesions since the previous visit, cosmetic results independently evaluated by both patient and physician, patient-reported pain (visual analogue scale), patient and physician satisfaction scores with cosmetic results, and patient-reported quality of life (Dermatology Life Quality Index). Safety parameters are also documented (adverse events and serious adverse events). DISCUSSION This clinical trial will assess the efficacy of repetitive DL-PDT in preventing AK and investigate possible rejuvenating effects of this treatment. (Trial registration: ClinicalTrials.gov Identifier: NCT02736760). TRIAL REGISTRATION ClinicalTrials.gov Identifier: NCT02736760 . Study Code Daylight_01. EudraCT 2014-005121-13.
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Affiliation(s)
- E Kohl
- Department of Dermatology, University Hospital Regensburg, 93042, Regensburg, Germany
| | - M Koller
- Center for Clinical Studies, University Hospital Regensburg, 93042, Regensburg, Germany
| | - F Zeman
- Center for Clinical Studies, University Hospital Regensburg, 93042, Regensburg, Germany
| | - R-M Szeimies
- Department of Dermatology and Allergology, Vest Hospital, Academic Teaching Hospital University of Bochum, 45657, Recklinghausen, Germany
| | | | - W Prager
- Prager & Partner, 22609, Hamburg, Germany
| | - P A Gerber
- Department of Dermatology, Medical Faculty, Heinrich-Heine University, 40225, Düsseldorf, Germany
| | - S Karrer
- Department of Dermatology, University Hospital Regensburg, 93042, Regensburg, Germany. .,Department of Dermatology, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany.
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19
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Vignion-Dewalle AS, Baert G, Thecua E, Vicentini C, Mortier L, Mordon S. Photodynamic therapy for actinic keratosis: Is the European consensus protocol for daylight PDT superior to conventional protocol for Aktilite CL 128 PDT? J Photochem Photobiol B 2017; 174:70-77. [PMID: 28756154 DOI: 10.1016/j.jphotobiol.2017.07.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 07/06/2017] [Accepted: 07/21/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND Topical photodynamic therapy (PDT) is an established treatment modality for various dermato-oncologic conditions. In Europe, initially requiring irradiation with red light, PDT of actinic keratosis (AK) can now also be carried out with exposure to daylight that has been clinically proven to be as effective as and less painful than red light. OBJECTIVES In this paper, we propose a comparison between the conventional protocol for Aktilite CL 128 (red light source) PDT and the European consensus protocol for daylight PDT - with the exposure is assumed to be performed during either a clear sunny day or an overcast day - in the treatment of AK with methyl aminolevulinate through a mathematical modeling. METHOD This already published modeling that is based on an iterative procedure alternating determination of the local fluence rate and updating of the local optical properties enables to estimate the local damage induced by the therapy. RESULTS The European consensus protocol for daylight PDT during a sunny day and an overcast day provides, on average, 6.50 and 1.79 times higher PDT local damages at the end of the treatment than those obtained using the conventional protocol for Aktilite CL 128 PDT, respectively. CONCLUSIONS Results analysis shows that, even performed during an overcast day, the European consensus protocol for daylight PDT leads to higher PDT local damages than the efficient conventional protocol for Aktilite CL 128.
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Affiliation(s)
- Anne-Sophie Vignion-Dewalle
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France.
| | - Gregory Baert
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Elise Thecua
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Claire Vicentini
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Laurent Mortier
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Serge Mordon
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
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20
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Gbyl K, Østergaard Madsen H, Dunker Svendsen S, Petersen PM, Hageman I, Volf C, Martiny K. Depressed Patients Hospitalized in Southeast-Facing Rooms Are Discharged Earlier than Patients in Northwest-Facing Rooms. Neuropsychobiology 2017. [PMID: 28637044 DOI: 10.1159/000477249] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND AND AIM Improvement in patients admitted to inpatient wards with severe depression is slow, and such patients are often discharged with residual symptoms which put them at risk for relapse. New treatments that can speed up recovery are highly desired. This naturalistic follow-up study in a specialized affective disorders unit investigated the impact of daylight on the length of hospital stay and improvement of depression. METHODS For a period of 1 year, we collected data on sociodemographics, length of stay, vitamin D, and depression severity for patients in an inpatient affective disorders unit. The ward is located with one facade that faces southeast (SE); the opposite one faces northwest (NW) and receives far less light and no direct sunlight during winter. RESULTS SE-facing rooms received far more daylight than NW-facing rooms. The length of stay was significantly lower in the SE rooms, i.e., 29.2 (±26.8) versus 58.8 (±42.0) days in the NW rooms (p = 0.01). There was a statistically nonsignificant greater reduction of 52.2% in depression severity for the patients staying in the SE rooms compared to 42.2% in the NW rooms, which may nevertheless be clinically relevant. CONCLUSION Due to the study design, no causality for the observed difference in length of stay can be given, but the results support findings in previous studies of the importance of architectural orientation providing natural daylight as a factor for improvement.
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Affiliation(s)
- Krzysztof Gbyl
- Psychiatric Center Copenhagen, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
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21
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van Bostelen I, Tijsterman M. Combined loss of three DNA damage response pathways renders C. elegans intolerant to light. DNA Repair (Amst) 2017; 54:55-62. [PMID: 28472716 DOI: 10.1016/j.dnarep.2017.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 03/17/2017] [Accepted: 04/10/2017] [Indexed: 12/20/2022]
Abstract
Infliction of DNA damage initiates a complex cellular reaction - the DNA damage response - that involves both signaling and DNA repair networks with many redundancies and parallel pathways. Here, we reveal the three strategies that the simple multicellular eukaryote, C. elegans, uses to deal with DNA damage induced by light. Separately inactivating repair or replicative bypass of photo-lesions results in cellular hypersensitivity towards UV-light, but impeding repair of replication associated DNA breaks does not. Yet, we observe an unprecedented synergistic relationship when these pathways are inactivated in combination. C. elegans mutants that lack nucleotide excision repair (NER), translesion synthesis (TLS) and alternative end joining (altEJ) grow undisturbed in the dark, but become sterile when grown in light. Even exposure to very low levels of normal daylight impedes animal growth. We show that NER and TLS operate to suppress the formation of lethal DNA breaks that require polymerase theta-mediated end joining (TMEJ) for their repair. Our data testifies to the enormous genotoxicity of light and to the demand of multiple layers of protection against an environmental threat that is so common.
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Affiliation(s)
- Ivo van Bostelen
- Department of Human Genetics, Leiden University Medical Centre, 2300 RC, Leiden, The Netherlands
| | - Marcel Tijsterman
- Department of Human Genetics, Leiden University Medical Centre, 2300 RC, Leiden, The Netherlands.
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Elvik R. Does the influence of risk factors on accident occurrence change over time? Accid Anal Prev 2016; 91:91-102. [PMID: 26974026 DOI: 10.1016/j.aap.2016.02.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/21/2016] [Accepted: 02/26/2016] [Indexed: 06/05/2023]
Abstract
A large number of studies have been made to assess the relationship between risk factors and accident occurrence. A risk factor is any factor that makes an accident more likely to occur. Very many risk factors have been identified, for example, being under the influence of alcohol while driving, driving on slippery roads, entering complex junctions, or driving in hours of darkness. Few studies have been made to determine whether the associations between risk factors and accident occurrence remain stable over time. This paper presents examples of studies that have replicated estimates of risk. All these studies were made within a given country, using the same method, to ensure that estimates of risk are comparable. The risk factors included in the paper are: daylight, horizontal curves, junctions, road surface conditions, precipitation, drinking and driving and driver age. For all these risk factors, their association with accidents has changed over time, mostly becoming weaker. A protective factor, snow depth, is also included. Its protective effect has become smaller over time. Possible reasons for the weakening influence of risk factors are discussed.
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Affiliation(s)
- Rune Elvik
- Institute of Transport Economics, Gaustadalleen 21, NO-0349 Oslo, Norway.
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Karami Z, Golmohammadi R, Heidaripahlavian A, Poorolajal J, Heidarimoghadam R. Effect of Daylight on Melatonin and Subjective General Health Factors in Elderly People. Iran J Public Health 2016; 45:636-43. [PMID: 27398336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND This paper investigated the effect of daylight on morning and night melatonin, subjective general health using GHQ questionnaire, sleepiness and alertness on elderly who lived in nursing houses. METHODS Nineteen nursing home residents participated voluntarily. They exposed to daylight from 9 to 10 a.m. and from 4 to 5 p.m. for 6 wk. The level of melatonin in the morning and at night was measured. General health of all participants was evaluated using General Health Questionnaire (GHQ) as well. RESULTS Daylight exposure significantly affected morning melatonin from 25.39 pg/ml to 59.77 pg/ml (P=0.001) and night melatonin were changed from 40.30pg/ml to 34.41pg/ml (P=0.081). Mean score of general health changed 36.31 to 29.89 (P=0.003). Karolinska Sleepiness Scale (KSS) and Visual Analogue Scale (VAS) showed increase sleepiness and decrease alertness from 3:00 to 7:00 a.m. Sleepiness decreased and alertness increased during 1:00 p.m. and 20:00 p.m. CONCLUSIONS Daylight exposure could delay sleep phase and correction of circadian rhythm in elderly. Anxiety and insomnia could be improved with daylight exposure. It suggests that elders should be exposed to scheduled daylight in morning and evening for prevention and improvement of mental disorders. Adequate light should be provided for elder's homes and nursing house.
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Girard C, Adamski H, Basset-Séguin N, Beaulieu P, Dreno B, Riboulet JL, Lacour JP. [Procedure for daylight methyl aminolevulinate photodynamic therapy to treat actinic keratoses]. Ann Dermatol Venereol 2016; 143:257-63. [PMID: 27016200 DOI: 10.1016/j.annder.2016.02.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/20/2016] [Accepted: 02/10/2016] [Indexed: 11/30/2022]
Abstract
Actinic keratosis (AK), also known as solar keratosis or pre-cancerous keratosis, is frequently observed in areas of skin exposed to sunlight, particularly in light-skinned patients. In France, photodynamic therapy using red light (conventional PDT) and methylamino 5-levulinate (MAL) is indicated in the treatment of thin or non-hyperkeratotic and non-pigmented multiple AK lesions or large zones covered with AK lesions. It is well-known for its efficacy but also for its side effects, especially pain during illumination, which can limit its use. An alternative to PDT using natural daylight has recently been proposed to treat actinic keratosis lesions, and results in greater flexibility as well as significant reduction in pain. The lesions are prepared as for conventional PDT, with MAL cream being applied by the physician or the patient, after which they are exposed to natural daylight for 2hours. The lesions are then gently cleansed and protected from natural light for 24hours. This paper seeks to provide a precise description of the daylight PDT procedure for the treatment of AK.
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Affiliation(s)
- C Girard
- Service de dermatologie, hôpital Saint-Éloi, CHU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - H Adamski
- Service de dermatologie, CHU Pontchaillou Rennes, 2, rue Henri-le-Guilloux, 35000 Rennes, France
| | - N Basset-Séguin
- Service de dermatologie, hôpital Saint-Louis, 1, avenue Claude-Vellefaux, 75010 Paris, France
| | - P Beaulieu
- Cabinet de dermatologie, 28, rue Seré-Depoin, 95300 Pontoise, France
| | - B Dreno
- Service de dermatologie, CHU de Nantes, place Alexis-Ricordeau, 44093 Nantes cedex, France
| | - J-L Riboulet
- Cabinet de dermatologie, 9, rue du 29-Juillet, 62000 Arras, France
| | - J-P Lacour
- Service de dermatologie, CHU de Nice, hôpital l'Archet 2, 151, route Saint-Antoine-de-Ginestière, CS 23079, 06202 Nice, France.
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Abstract
Investigators from University of Oulu, Finland, evaluated the diurnal and seasonal occurrence of the first febrile seizures (FS) in 461 children in a population-based study of 1522 children.
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Affiliation(s)
- John J Millichap
- Division of Neurology, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL; Departments of Pediatrics and Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - J Gordon Millichap
- Division of Neurology, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL; Departments of Pediatrics and Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL
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Sanclemente G, Mancilla GA, Hernandez G. A double-blind randomized controlled trial to assess the efficacy of daylight photodynamic therapy with methyl-aminolevulinate vs. Placebo and daylight in patients with facial photodamage. Actas Dermosifiliogr 2015; 107:224-34. [PMID: 26643786 DOI: 10.1016/j.ad.2015.10.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 10/02/2015] [Accepted: 10/12/2015] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Daylight PDT (dPDT) is easy to use and does not require light equipment. Such therapy has been exhaustively proved to be successful in the treatment of actinic keratosis, but its use in skin photodamage remains unclear. OBJECTIVE To evaluate dPDT's efficacy in skin facial photodamage. PATIENTS AND METHODS This was a parallel-group double-blind, randomized placebo-controlled trial. Sixty participants with symmetric facial photodamage were allocated to topical methyl aminolevulinate (MAL) and daylight vs. matching placebo and daylight. Primary outcome was global photodamage improvement/failure 1 month after the third session. Secondary outcomes included: pain evaluation; specific photodamage severity scores; sun irradiance quantification and Skindex-29 scores. Adverse events were also investigated. RESULTS Primary analysis included all randomized patients. All patients sun-exposed for 120min in 3 sessions. The risk of failure was lower in the MAL-dPDT group than in the placebo plus daylight group (RR: 0.18; 95% CI: 0.08-0.41). Mean solar irradiance (W/m(2)) during the first, second and third sessions was 480.82, 430.07 and 435.84, respectively. Items 5 and 14 of Skindex-29 in the MAL-dPDT group showed statistical significant differences. Two patients in the MAL-dPDT group had serious and non-serious events not directly related to the product. CONCLUSION dPDT with MAL was un-painful, effective and safe for the treatment of facial photodamage. Herpes simplex prophylaxis should be considered before sessions.
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Affiliation(s)
- G Sanclemente
- IPS Universitaria, Universidad de Antioquia, Medellín, Colombia; Grupo de Investigación Dermatológica (GRID), Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia.
| | - G A Mancilla
- Grupo de Investigación Dermatológica (GRID), Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - G Hernandez
- Grupo de Investigación Dermatológica (GRID), Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
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Gilaberte Y, Aguilar M, Almagro M, Correia O, Guillén C, Harto A, Pérez-García B, Pérez-Pérez L, Redondo P, Sánchez-Carpintero I, Serra-Guillén C, Valladares LM. Spanish-Portuguese consensus statement on use of daylight-mediated photodynamic therapy with methyl aminolevulinate in the treatment of actinic keratosis. Actas Dermosifiliogr 2015; 106:623-31. [PMID: 26115793 DOI: 10.1016/j.ad.2015.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Revised: 05/28/2015] [Accepted: 06/01/2015] [Indexed: 10/24/2022] Open
Abstract
INTRODUCTION Daylight-mediated photodynamic therapy (PDT) is a new type of PDT that is as effective as conventional PDT in grade 1 and 2 actinic keratosis but with fewer adverse effects, resulting in greater efficiency. The climatic conditions in the Iberian Peninsula require an appropriately adapted consensus protocol. OBJECTIVE We describe a protocol for the treatment of grade 1 and 2 actinic keratosis with daylight-mediated PDT and methyl aminolevulinate (MAL) adapted to the epidemiological and clinical characteristics of Spanish and Portuguese patients and the climatic conditions of both countries. METHODS Twelve dermatologists from different parts of Spain and Portugal with experience in the treatment of actinic keratosis with PDT convened to draft a consensus statement for daylight-mediated PDT with MAL in these countries. Based on a literature review and their own clinical experience, the group developed a recommended protocol. RESULTS According to the recommendations adopted, patients with multiple grade 1 and 2 lesions, particularly those at risk of developing cancer, are candidates for this type of therapy. Daylight-mediated PDT can be administered throughout the year, although it is not indicated at temperatures below 10°C or at excessively high temperatures. Likewise, therapy should not be administered when it is raining, snowing, or foggy. The procedure is simple, requiring application of a sunscreen with a protection factor of at least 30 based exclusively on organic filters, appropriate preparation of the lesions, application of MAL without occlusion, and activation in daylight for 2hours. CONCLUSION This consensus statement represents a practical and detailed guideline to achieve maximum effectiveness of daylight-mediated PDT with MAL in Spain and Portugal with minimal adverse effects.
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Affiliation(s)
- Y Gilaberte
- Unidad de Dermatología, Hospital San Jorge, Huesca, España.
| | - M Aguilar
- Servicio de Dermatología, Hospital Costa del Sol, Marbella, Málaga, España
| | - M Almagro
- Servicio de Dermatología, Complejo Hospitalario Universitario, La Coruña, España
| | - O Correia
- Centro de Dermatología Epidermis, Instituto CUF, Oporto y Facultad de Medicina, Universidad de Oporto, Oporto, Portugal
| | - C Guillén
- Servicio de Dermatología, Instituto Valencia de Oncología, Valencia, España
| | - A Harto
- Servicio de Dermatología, Hospital Universitario Ramón y Cajal, Madrid, España
| | - B Pérez-García
- Servicio de Dermatología, Hospital Universitario Ramón y Cajal, Madrid, España
| | - L Pérez-Pérez
- Servicio de Dermatología, Estructura Organizativa de Gestión Integrada (EOXI) de Vigo, Clínica Pérez & Gavín dermatólogos, Vigo, España
| | - P Redondo
- Servicio de Dermatología, Clínica Universitaria de Navarra, Pamplona, España
| | | | - C Serra-Guillén
- Servicio de Dermatología, Instituto Valencia de Oncología, Valencia, España
| | - L M Valladares
- Servicio de Dermatología, Complejo Asistencial Universitario de León, León, España
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Muthulingam S, Lee IH, Uthirakumar P. Highly efficient degradation of dyes by carbon quantum dots/N-doped zinc oxide (CQD/N-ZnO) photocatalyst and its compatibility on three different commercial dyes under daylight. J Colloid Interface Sci 2015; 455:101-9. [PMID: 26057601 DOI: 10.1016/j.jcis.2015.05.046] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 05/21/2015] [Accepted: 05/22/2015] [Indexed: 01/17/2023]
Abstract
Eco-friendly carbon quantum dots/nitrogen-doped ZnO (CQD/N-ZnO) composites were successfully prepared by a facile one-step method. The various techniques were employed to characterize the phase structure, morphology and optical properties of CQD/N-ZnO composites. The nitrogen doping was confirmed by Raman and X-ray photoelectron spectroscopy. Three commercial dyes, such as malachite green, methylene blue and fluorescein dyes were chosen to investigate the photocatalytic performance of CQD/N-ZnO under daylight irradiation. It was found that the CQD/N-ZnO photocatalyst established a high compatibility to degrade all three commercial dyes within 30-45 min, under daylight irradiation. Also, it remains capable of reusing the CQD/N-ZnO photocatalyst for repeated photocatalytic performance due to anti-photocorrosion offered by CQDs. The synergetic effect of N-doping and CQDs is key to design a new class of photocatalyst for environmental remediation under naturally available daylight source.
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Affiliation(s)
- S Muthulingam
- Nanoscience Center for Optoelectronic and Energy Devices [Nano-COED], Department of Chemistry, Sona College of Technology, Salem, Tamil Nadu 636 005, India
| | - In-Hwan Lee
- School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 561-756, South Korea.
| | - Periyayya Uthirakumar
- Nanoscience Center for Optoelectronic and Energy Devices [Nano-COED], Department of Chemistry, Sona College of Technology, Salem, Tamil Nadu 636 005, India; School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 561-756, South Korea.
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Markussen S, Røed K. Daylight and absenteeism--evidence from Norway. Econ Hum Biol 2015; 16:73-80. [PMID: 24529766 DOI: 10.1016/j.ehb.2014.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 01/02/2014] [Accepted: 01/09/2014] [Indexed: 06/03/2023]
Abstract
Based on administrative register data from Norway, we examine the impact of hours of daylight on sick-leave absences among workers. Our preferred estimates imply that an additional hour of daylight increases the daily entry rate to absenteeism by 0.5 percent and the corresponding recovery rate by 0.8 percent, ceteris paribus. The overall relationship between absenteeism and daylight hours is negative. Absenteeism is also sensitive to weather conditions. Heavy snowfall raises the incidence of absence during the winter, while warm weather reduces the probability of returning to work during the summer.
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Affiliation(s)
| | - Knut Røed
- The Ragnar Frisch Centre for Economic Research, Norway
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Nadhman A, Nazir S, Khan MI, Arooj S, Bakhtiar M, Shahnaz G, Yasinzai M. PEGylated silver doped zinc oxide nanoparticles as novel photosensitizers for photodynamic therapy against Leishmania. Free Radic Biol Med 2014; 77:230-8. [PMID: 25266330 DOI: 10.1016/j.freeradbiomed.2014.09.005] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 08/22/2014] [Accepted: 09/02/2014] [Indexed: 11/22/2022]
Abstract
We describe daylight responsive silver (Ag) doped semiconductor nanoparticles of zinc oxide (DSNs) for photodynamic therapy (PDT) against Leishmania. The developed materials were characterized by X-ray diffraction analysis (XRD), Rutherford backscattering (RBS), diffused reflectance spectroscopy (DRS), and band-gap analysis. The Ag doped semiconductor nanoparticles of zinc oxide were PEGylated to enhance their biocompatibility. The DSNs demonstrated effective daylight response in the PDT of Leishmania protozoans, through the generation of reactive oxygen species (ROS) with a quantum yield of 0.13 by nondoped zinc oxide nanoparticles (NDSN) whereas 0.28 by DSNs. None of the nanoparticles have shown any antileishmanial activity in dark, confirming that only ROS produced in the daylight were involved in the killing of leishmanial cells. Furthermore, the synthesized nanoparticles were found biocompatible. Using reactive oxygen species scavengers, cell death was attributable mainly to 77-83% singlet oxygen and 18-27% hydroxyl radical. The nanoparticles caused permeability of the cell membrane, leading to the death of parasites. Further, the uptake of nanoparticles by Leishmania cells was confirmed by inductively coupled plasma atomic emission spectroscopy (ICP-AES). We believe that these DSNs are widely applicable for the PDT of leishmaniasis, cancers, and other infections due to daylight response.
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Affiliation(s)
- Akhtar Nadhman
- Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan; Nanosciences and Catalysis Division, National Centre for Physics, Shahdra Valley Road, Quaid-i-Azam University Campus, Islamabad, Pakistan
| | - Samina Nazir
- Nanosciences and Catalysis Division, National Centre for Physics, Shahdra Valley Road, Quaid-i-Azam University Campus, Islamabad, Pakistan.
| | | | - Syeda Arooj
- Nanosciences and Catalysis Division, National Centre for Physics, Shahdra Valley Road, Quaid-i-Azam University Campus, Islamabad, Pakistan; Department of Chemistry, Hazara University, KPK, Pakistan
| | | | - Gul Shahnaz
- Department of Pharmacy, Quaid-i-Azam University, Islamabad, Pakistan
| | - Masoom Yasinzai
- Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
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