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Narcolepsy is a chronic neurological disorder that impairs the ability to regulate sleep–wake cycles, and specifically impacts REM (rapid eye movement) sleep. [1] The pentad symptoms of narcolepsy include excessive daytime sleepiness (EDS), sleep-related hallucinations, sleep paralysis, disturbed nocturnal sleep (DNS), and cataplexy. [1]
The full mechanism of action of sodium oxybate is poorly understood. [ 3 ] [ 7 ] GHB is a normal metabolite of GABA that interacts with the GABA B receptor and the GHB receptor . [ 3 ] It has been shown to enhance the restorativeness of sleep in part by altering sleep architecture in narcoleptic patients.
Claude Lorrain mirror in shark skin case. A Claude glass (or black mirror) is a small mirror, slightly convex in shape, with its surface tinted a dark colour. Bound up like a pocket-book or in a carrying case, Claude glasses were used by artists, travelers and connoisseurs of landscape and landscape painting.
Pediatric narcolepsy cases are cases when patients are diagnosed or experience symptoms onset for narcolepsy before the age of 18. Of patients who obtain a formal diagnosis for narcolepsy, more than 50% report first experiencing symptoms of narcolepsy more than 10 years before their formal diagnosis, with an average age of symptom onset being at age 15 and symptom onset most likely to occur ...
One of the mirrors of XRISM made of 203 foils. X-ray mirrors can be made of glass, ceramic, or metal foil, coated by a reflective layer. [1] The most commonly used reflective materials for X-ray mirrors are gold and iridium. Even with these the critical reflection angle is energy-dependent. For gold at 1 keV, the critical reflection angle is 2. ...
The two surfaces of the reflector have different radii to correct the aberration of the spherical mirror. Light passes through the glass twice, making the overall system act like a triplet lens. [3] Mangin mirrors were used in searchlights, where they produced a nearly true parallel beam.
Size comparison of primary mirrors. Segmented mirrors are typically hexagonal and arranged in a honeycomb pattern. A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. The segments can be either spherical or asymmetric (if they are part of a larger parabolic reflector [1]).
Head mirror A doctor using a head mirror to illuminate his patient's nasal passages. A head mirror is a simple diagnostic device, stereotypically worn by physicians, but less so in recent decades as they have become somewhat obsolete. [1] A head mirror is mostly used for examination of the ear, nose and throat (ENT).