Ultraviolet (UV) radiation is associated with negative health effects, including sun damage and skin cancer. The purpose of this study is to compare the protective effects of the shade provided by a sun umbrella versus that provided by a tree. Sun sensors that register the level and dose of UV radiation were placed in the shade and in direct sunlight. Measurements were recorded every half hour between the hours of 12:30 p.m. and 3:00 p.m. in Sacramento, California. The results suggest that the level of UV radiation in the shade is not zero. The sensors located in tree shade indicated that over 5% of UV radiation was detected in the shade. The sensors located in sun-umbrella shade showed that greater than 17% of UV radiation reached the shade. The sun sensors used in our study collected UV radiation data relevant to UV index; however, they did not differentiate between UVA, UVB, visible, and infrared light. The amount of UV radiation detected in the shade is not zero, thus regular sunscreen use and other sun protective practices should be followed to reduce the risk of sun damage and skin cancer.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Light quality affects chlorophyll biosynthesis and photosynthetic performance in Antarctic Chlamydomonas.
Photosynth Res
January 2025
Department of Biology, University of Ottawa, 30 Marie-Curie Pr., Ottawa, ON, K1N 6N5, Canada.
The perennially ice-covered Lake Bonney in Antarctica has been deemed a natural laboratory for studying life at the extreme. Photosynthetic algae dominate the lake food webs and are adapted to a multitude of extreme conditions including perpetual shading even at the height of the austral summer. Here we examine how the unique light environment in Lake Bonney influences the physiology of two Chlamydomonas species.
View Article and Find Full Text PDFAssessing the effect of sunlight exposure and reuse of polyethylene terephthalate bottles on phthalate migration.
Sci Total Environ
January 2025
Social Development and Health Promotion Research Center, Health Policy and Promotion Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran. Electronic address:
Nowadays, polyethylene terephthalate (PET) bottles are widely used for packaging drinks and food. However, concerns have been raised about the possible migration of harmful chemicals, particularly phthalates, from these containers into their contents. Therefore, this study investigates the effects of sunlight exposure and PET bottle reuse on phthalate migration, focusing on three common phthalates: bis(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), and benzyl butyl phthalate (BBP).
View Article and Find Full Text PDF[Effects of different drying methods on content of main chemical compounds in Callicarpae Nudiflorae Folium].
Zhongguo Zhong Yao Za Zhi
December 2024
State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China.
This study aims to identify the main chemical compounds, investigate the effects of different drying methods on the quality, and determine the appropriate drying method of Callicarpae Nudiflorae Folium. UPLC-UV-Q-TOF-MS was employed to characterize and identify 35 main compounds, including phenylethanoid glycosides, flavonoids, and iridoids in Callicarpae Nudiflorae Folium. A method for the simultaneous determination of 8 compounds with strong UV absorption and high content was established to evaluate the quality of Callicarpae Nudiflorae Folium dried by different methods.
View Article and Find Full Text PDFA comparative evaluation of the effects of white noise, brown noise, and pink noise on dental anxiety of pediatric patients undergoing dental extraction treatment: A randomized control study.
J Indian Soc Pedod Prev Dent
October 2024
Department of Paediatric and Preventive Dentistry, ACPM Dental College, Dhule, Maharashtra, India.
Background: Audio-analgesia is one of the unexplored aspects of behavior management in pediatric dentistry, and recently, there have been many new inclusions in shades of noise that were previously just limited to white noise, like brown noise and pink noise.
Aim: The aim of the study was to evaluate and compare the effectiveness of white noise, brown noise, and pink noise on dental anxiety in pediatric patients undergoing primary tooth extraction.
Study Settings And Design: Multiarm, triple-blinded, parallel-group randomized controlled trial.
Effect of Flowering Shading on Grain Yield and Quality of Durum Wheat in a Mediterranean Environment.
Plants (Basel)
December 2024
Department of Bioscience and Technologies for Food, Agriculture and Environment, University of Teramo, Via Balzarini, 1, 64100 Teramo, Italy.
The phenomenon known as "dimming" or shading, caused by the increase in aerosols, air pollutants, and population density, is reducing global radiation, including both direct solar radiation and radiation scattered by the atmosphere. This phenomenon poses a significant challenge for agricultural production in many regions worldwide, with a global radiation decrease estimated between 1.4% and 2.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!