Contribution to the study of UV-B solar radiation in Central Spain

Bilbao, J.; Miguel, A. de

doi:10.1016/j.renene.2012.10.055

Cited by 16 publications

(5 citation statements)

References 20 publications

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“…Equivalent figures for a winter’s day were 452 kJ m −2 , 439 kJ m −2 (97%), and 14 kJ m −2 (3%) (data supplied by the Australian Bureau of Meteorology). In Valladolid (41.6532° N, 4.7246° E, 692 m ASL), Spain, during 2002–2011, the maximum daily UV-B dose in May and June was 50.24 kJ m −2 and the minimum was 0.88 kJ m −2 in January and December [ 69 ]. Escobedo-Bretado et al [ 70 ] reported the mean monthly accumulated UV-A dose at Durango, Mexico in December 2015 to be 905 kJ m −2 ·day −1 and in June 2016 to be 1732 kJ m −2 ·day.…”

Section: Discussionmentioning

confidence: 99%

Susceptibility of Diaphorina citri to Irradiation with UV-A and UV-B and the Applicability of the Bunsen–Roscoe Reciprocity Law

Parajuli

Beattie

Holford

et al. 2023

Insects

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Populations of Diaphorina citri decline with elevation and, in a study in Bhutan, were rarely found above 1200 m ASL. The impact of ultraviolet (UV) radiation, particularly UV-B, on immature stages of the psyllid was proposed as limiting factor. As no studies have been undertaken on the influences of UV radiation on the development of D. citri, we examined the effects of UV-A and UV-B on different stadia of the psyllid. In addition, compliance with the Bunsen–Roscoe reciprocity law was examined. Irradiation with UV-A marginally reduced egg hatch and the survival times of emerging nymphs. Early instar nymphs were little affected by this waveband, but the survival of adults was reduced at the higher doses used. With UV-B, egg hatch and the survival times of early and late instar nymphs declined in proportion to UV-B dose. A dose of 57.6 kJ m−2 d−1 reduced the survival time of only adult females. Female fecundity was reduced at high UV-A and UV-B doses but increased at low doses. The Bunsen–Roscoe law held true for eggs and early instar nymphs for different durations and irradiances of UV-B. Eggs and nymphs had ED50 values for UV-B lower than the daily fluxes of this wavelength experienced worldwide. Thus, UV-B could be a factor causing the psyllid to be scarce at high elevations.

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Section: Discussionmentioning

confidence: 99%

Susceptibility of Diaphorina citri to Irradiation with UV-A and UV-B and the Applicability of the Bunsen–Roscoe Reciprocity Law

Parajuli

Beattie

Holford

et al. 2023

Insects

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“…The relationships between the global solar radiation and UV-B radiation at four stations in Egypt have been studied and linear empirical formulas for estimating UV-B from global radiation at these stations has been deduced. Likewise, Bilbao and Miguel [28] analyze a series of UV-B broadband solar irradiances, 280-315 nm, measured during the period 2002 to 2011 in Valladolid, Spain. This has led to the daily UV-B values following the pattern of the solar elevation angle.…”

Section: Literature Review or Research Backgroundmentioning

confidence: 99%

Implementation of a Web Software for Ultraviolet Radiation Based on the GUV 2511 Radiometer

Bello

Augusto²

2022

ing. Solidar

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Introducción: Este artículo es producto de la investigación "Implementación de un software web para radiación ultravioleta basado en el radiómetro GUV2511", desarrollado en la Universidad los Libertadores en 2018. Problema: La información descargada del radiómetro GUV2511 se almacena en el servidor y, de forma manual, se descargan los datos, que representan la cantidad de rayos UV-B provenientes del sol, con el peligro de que la información se pierda durante la transcripción. Objetivo: Implementar un software web basado en el radiómetro GUV2511 para determinar los valores característicos del índice UV para el área de Bogotá. Metodología: La metodología utilizada en la investigación es Scrum, brindando al usuario una forma fácil de consultar y comprender rápidamente los resultados. Resultados: el software captura datos del radiómetro GUV2511 a través de un proceso ETC. Los datos capturados se grafican, realizando diferentes consultas. Conclusión: Se implementó un software web, que presenta los datos y muestra las gráficas que se generan a partir del índice UV. Además, la cantidad de luz que alcanzan los rayos ultravioleta, en Bogotá, en función de factores como la hora del día, el mes y la estación del año. Originalidad: Esta investigación apoya y fortalece el trabajo desarrollado en el laboratorio de radiometría para ser un lugar de apoyo al IDEAM en su recolección de datos. Limitaciones: El software se desarrolla a partir de la solicitud realizada por el laboratorio de radiometría como una primera fase y es necesaria una segunda fase para la validación con expertos.

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“…UVA has the longest wavelength, ranging from 320 and 400 nm, and a penetration level of 95% through the ozone; UVB has a penetration level of 5% and a range of 290-320 nm; and finally UVC with a range of 200-290 nm which is absorbed by our stratosphere [12]. The penetration level of UVA is constant throughout the day while UVB's penetration level will increase to its highest value of 5% at midday [13]. As our eyes take in light, they are also exposed to UVR which may cause damage to ocular tissues, but the human eye has unique UVR-filtering systems.…”

Section: Introductionmentioning

confidence: 99%

Detrimental Effects of UVB on Retinal Pigment Epithelial Cells and Its Role in Age-Related Macular Degeneration

Mahendra

Tan

Pusparajah

et al. 2020

Oxidative Medicine and Cellular Longevity

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Retinal pigment epithelial (RPE) cells are an essential part of the human eye because they not only mediate and control the transfer of fluids and solutes but also protect the retina against photooxidative damage and renew photoreceptor cells through phagocytosis. However, their function necessitates cumulative exposure to the sun resulting in UV damage, which may lead to the development of age-related macular degeneration (AMD). Several studies have shown that UVB induces direct DNA damage and oxidative stress in RPE cells by increasing ROS and dysregulating endogenous antioxidants. Activation of different signaling pathways connected to inflammation, cell cycle arrest, and intrinsic apoptosis was reported as well. Besides that, essential functions like phagocytosis, osmoregulation, and water permeability of RPE cells were also affected. Although the melanin within RPE cells can act as a photoprotectant, this photoprotection decreases with age. Nevertheless, the changes in lens epithelium-derived growth factor (LEDGF) and autophagic activity or application of bioactive compounds from natural products can reverse the detrimental effect of UVB. Additionally, in vivo studies on the whole retina demonstrated that UVB irradiation induces gene and protein level dysregulation, indicating cellular stress and aberrations in the chromosome level. Morphological changes like retinal depigmentation and drusen formation were noted as well which is similar to the etiology of AMD, suggesting the connection of UVB damage with AMD. Therefore, future studies, which include mechanism studies via in vitro or in vivo and other potential bioactive compounds, should be pursued for a better understanding of the involvement of UVB in AMD.

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Contribution to the study of UV-B solar radiation in Central Spain

Cited by 16 publications

References 20 publications

Susceptibility of Diaphorina citri to Irradiation with UV-A and UV-B and the Applicability of the Bunsen–Roscoe Reciprocity Law

Susceptibility of Diaphorina citri to Irradiation with UV-A and UV-B and the Applicability of the Bunsen–Roscoe Reciprocity Law

Implementation of a Web Software for Ultraviolet Radiation Based on the GUV 2511 Radiometer

Detrimental Effects of UVB on Retinal Pigment Epithelial Cells and Its Role in Age-Related Macular Degeneration

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