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Allan Rechtschaffen (December 8, 1927 – November 29, 2021) [1] was a noted pioneer [2] [3] in the field of sleep research whose work includes some of the first laboratory studies of insomnia, narcolepsy, sleep apnea, and napping. He received his PhD from Northwestern University in 1956. [4] He did research in the effects on sleep of exercise ...
The guitar was used in this state from approximately February 1977 until July 1977, when he put strips of masking tape around the body in a criss-crossing stripe pattern before repainting it white, creating the classic Frankenstrat paint scheme. [5] Van Halen put a Gibson decal on the headstock, emphasizing the "cross-pollination" between ...
Humans are sensitive to light with a short wavelength. Specifically, melanopsin is sensitive to blue light with a wavelength of approximately 480 nm. [19] The effect this wavelength of light has on melanopsin leads to physiological responses such as the suppression of melatonin production, increased alertness, and alterations to the circadian ...
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
"Eruption" starts with a short accompanied intro with Alex Van Halen on drums and Michael Anthony on bass.The highlight of the solo is the use of two-handed tapping. "Eruption" was played on the Frankenstrat, with an MXR Phase 90, an Echoplex, a Univox echo unit and a 1968 Marshall 1959 Super Lead tube amp.
Dijk's research focusses on the regulation and function of sleep and its interaction with the circadian timing system in humans. [8] He examines how sleep, sleep regulation and circadian rhythms change across the lifespan and how sleep and circadian rhythms are affected by environmental factors such as natural and artificial light. [9]
For example, melatonin, a hormonal timekeeper, is considered a strongly circadian hormone, whose secretion increases at dim light and peaks during nocturnal sleep, diminishing with bright light to the eyes. [132] In some organisms melatonin secretion depends on sleep, but in humans it is independent of sleep and depends only on light level.