Tag: "darkness" at medical news

Mood lighting: Penn researchers determine role of serotonin in modulating circadian rhythm

...sensitivity to light and that exposure to constant darkness leads to a decrease in serotonin levels in the bra...tion of serotonin levels in flies kept in constant darkness may provide scientists with insight into the etiology and treatment of SAD, a mood disorder related ...

South Polar ozone hole makes big comeback

...y low temperatures, and in the cold and continuous darkness of this season, polar stratospheric clouds are formed that contain chlorine. The stratospheric ozone layer that protects life on Earth from harmful ultraviolet (UV) radiation is vulnerable to the presence of certain chemicals in the atmosphere such ...

Artificial light at night stimulates breast cancer growth in laboratory mice

...udy also showed that extended periods of nighttime darkness greatly slowed the growth of these tumors. The stu...-rich blood collected from subjects while in total darkness severely slowed the growth of the tumors. "These results are due to a direct effect of the melatonin...

Not so different after all: Mysterious eye cells adapt to light

...igger responses when the cells had been sitting in darkness than when they were exposed to bright background light. These adjustments persisted when ipRGC synapses were chemically blocked, indicating that the changes in sensitivity were indeed happening within these cells....

Darkness more than triples EMS helicopter crash fatality risk

Post-crash fires, darkness or bad weather greatly decrease the likelihood of ... Injury Research and Policy. "Our study found that darkness more than triples the risk of fatalities when EMS helicopters crash and that bad weather increases t...

New fruit fly protein illuminates circadian response to light

...ss, constant light, and equal periods of light and darkness (a light-dark cycle). During exposure to constant ...oral differences during their exposure to constant darkness and the light-dark cycle. However, when the fruit flies were shifted from one light-dark cycle to an...

New studies in the journal Sleep focus on helping children, women sleep better

...ained on a light-dark (LD) schedule or in constant darkness (DD) for three to four weeks, and treated with DSP-4, a neurotoxic agent specific for noradrenergic-LC projections. Vigilance states were analyzed before and three weeks after LC lesion. The DSP-4 lesion was verified by immunohistochemistry of nora...

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(Date:4/23/2014)... conclusive evidence that the source of a unique rhythmic ... called the "bio-duck," is the Antarctic minke whale ( ... personnel in the 1960s who thought it sounded like ... various locations in the Southern Ocean, but its source ... 2013, an international team of researchers deployed acoustic tags ...
(Date:4/23/2014)... the likelihood of an accurate group decision increases with ... when a collective faces a variety of factors ... University researchers report that smaller groups actually tend to ... excessively focused on only certain pieces of information. , ... known about collective intelligence, or the "wisdom of crowds," ...
(Date:4/23/2014)... The shale gas boom has transformed the energy ... locations, it could cause conflict among the energy ... resources, say researchers. They add that degraded water ... adequate safeguards. The feature article appears in the ... , Meagan S. Mauter and colleagues point out ...
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