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A classic circular form spider's web Infographic illustrating the process of constructing an orb web. A spider web, spiderweb, spider's web, or cobweb (from the archaic word coppe, meaning 'spider') [1] is a structure created by a spider out of proteinaceous spider silk extruded from its spinnerets, generally meant to catch its prey.
Canities subita, also called Marie Antoinette syndrome or Thomas More syndrome, is an alleged condition of hair turning white overnight due to stress or trauma. [1] The trivial names come from specific cases in history including that of Queen Marie Antoinette of France whose hair was noted as having turned stark white overnight after her capture following the ill-fated flight to Varennes ...
Grey or white hair is not caused by a true grey or white pigment, but is due to a lack of pigmentation and melanin. The clear hairs appear as grey or white because of the way light is reflected from the hairs. The change in hair colour occurs when melanin ceases to be produced in the hair root and new hairs grow in without pigment.
Arachnoid – having entangled hairs that resemble cobwebs. Bloom – waxy coating that covers some plants. Canescent – with gray pubescence. Ciliate – with a fringe of marginal hairs. Coriaceouse – with a tough or leathery texture. Fimbriate – finely cut into fringes, the edge of a frilly petal or leaf. Floccose – Glabrate –
Redouts are potentially dangerous and can cause retinal damage and hemorrhagic stroke. Pilots of high performance aircraft can increase their resistance to greyouts by using a g-suit, which controls the pooling of blood in the lower limbs, but there is no suit yet capable of controlling a redout. In both cases, symptoms may be remedied ...
Other causes for floaters include cystoid macular edema and asteroid hyalosis. The latter is an anomaly of the vitreous humour, whereby calcium clumps attach themselves to the collagen network. The bodies that are formed in this way move slightly with eye movement, but then return to their fixed position.
How sunlight causes gray hair Sun damage contributes to the graying of hair at the molecular level, Dr. Michelle Henry, a board-certified dermatologist in New York City, tells TODAY.com.
This causes an image to be bleached onto the retina by the strong response of the rods and cones. In all these cases, the stimulus fades away after a short time and disappears. The Troxler effect is enhanced if the stimulus is small, is of low contrast (or "equiluminant"), or is blurred.