News tagged with sunlight
Expert explores how sunlight may affect ADHD patients
Researchers are interested in exploring how sunlight, sleep and screens (like those on computers and TVs) may affect those with attention-deficit/hyperactivity disorder (ADHD), says Dr. L. Eugene Arnold, a child psychiatrist ...
Attention deficit disorders
May 17, 2013 |
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Vitamin D may lower diabetes risk in obese children and adolescents, study finds
Childhood and adolescent obesity rates in the United States have increased dramatically in the past three decades. Being obese puts individuals at greater risk for developing Type 2 diabetes, a disease in which individuals ...
Diabetes
Mar 26, 2013 |
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Get a jump on daylight saving time
Many people will go to work on less sleep than normal Monday because they will have trouble adjusting to Daylight Saving Time.
Health
Mar 08, 2013 |
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Wolf in sheep's clothing: Uncovering how deadly bacteria trick immune system
An outbreak of tuberculosis in the skid row area of downtown Los Angeles may have exposed up to 4,500 individuals to the bacterium that causes the deadly disease and has left federal officials scrambling ...
Medical research
Feb 28, 2013 |
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Keep tots' milk to two cups a day, study says
(HealthDay)—Drinking two cups of milk a day gives toddlers adequate amounts of vitamin D without lowering their iron levels, according to new research.
Pediatrics
Dec 17, 2012 |
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Vitamin D can help infection-prone patients avoid respiratory tract infection
Treating infection-prone patients over a 12-month period with high doses of vitamin D reduces their risk of developing respiratory tract infection – and consequently their antibiotic requirement. This according to a new ...
Health
Dec 13, 2012 |
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Researchers study how patterns, timing of sunlight exposure contribute to skin cancers
(Medical Xpress)—Researchers at Moffitt Cancer Center, the University of South Florida and the International Agency for Research on Cancer in France have studied the patterns and timing of sunlight exposure and how each ...
Cancer
Oct 23, 2012 |
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Myths and misunderstandings hamper efforts to prevent cancer
New insights on the global fight to prevent cancers were presented during the ESMO 2012 Congress of the European Society for Medical Oncology in Vienna. The studies highlight the challenges of overcoming misunderstandings ...
Cancer
Sep 30, 2012 |
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Scientists discover melanoma-driving genetic changes caused by sun damage
It's been a burning question in melanoma research: Tumor cells are full of ultraviolet (UV)-induced genetic damage caused by sunlight exposure, but which mutations drive this cancer?
Cancer
Jul 19, 2012 |
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Sunlight and vitamin D findings may help understanding of autoimmune diseases
(Medical Xpress) -- Aberdeen scientists have demonstrated for the first time a clear link between sunlight, vitamin D and an impact on regulatory cells in the immune system in findings that might provide new ...
Immunology
Jul 18, 2012 |
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Sun exposure and cutaneous HPV infection found synergistic in skin cancers
Researchers at Moffitt Cancer Center and colleagues at the University of South Florida and the German Cancer Research Center in Heidelberg have found that having antibodies for cutaneous types of human papillomavirus (HPV), ...
Cancer
Jun 25, 2012 |
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Health benefits of vitamin D dependent on type taken
New research has shown that vitamin D3 supplements could provide more benefit than the close relative vitamin D2. The findings published in the June edition of the American Journal of Clinical Nutrition could potentially lead t ...
Health
May 31, 2012 |
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When too much sun is not enough
(Medical Xpress) -- Lupus patients show more severe symptoms of the disease if their vitamin D levels are low, an Australian-first study has found.
Diseases, Conditions, Syndromes
May 07, 2012 |
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Are European kids getting enough vitamin D? Winter weather reopens the debate
The cold snap has well and truly set in across much of Europe, and as temperatures fall, watching our health becomes increasingly more crucial. Keeping our vitamin D levels up during the winter months has long been lauded ...
Health
Feb 06, 2012 |
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Lower levels of sunlight link to allergy and eczema
Increased exposure to sunlight may reduce the risk of both food allergies and eczema in children, according to a new scientific study published this week.
Health
Feb 03, 2012 |
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Sunlight
Sunlight, in the broad sense, is the total spectrum of the electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the atmosphere, and the solar radiation is obvious as daylight when the Sun is above the horizon. Near the poles in summer, the days are longer and the nights are shorter or non-existent. In the winter at the poles the nights are longer and for some periods of time, sunlight may not occur at all. When the direct radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and heat. Radiant heat directly produced by the radiation of the sun is different from the increase in atmospheric temperature due to the radiative heating of the atmosphere by the sun's radiation. Sunlight may be recorded using a sunshine recorder, pyranometer or pyrheliometer. Sunlight takes about 8.3 minutes to reach the Earth. The World Meteorological Organization defines sunshine as direct irradiance from the Sun measured on the ground of at least 120 watts per square metre.
Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared, visible, and ultra-violet light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.
Sunlight is a key factor in photosynthesis, a process crucially important for life on Earth.
For more information about Sunlight, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
