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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.
Construction of a cobweb plot of the logistic map = (), showing an attracting fixed point. An animated cobweb diagram of the logistic map = (), showing chaotic behaviour for most values of >.
Hutchinson's mask is a patient's sensation that the face is covered with a mask or a gauzy network like cobwebs. This medical sign is associated with tabes dorsalis [ 1 ] affecting the trigeminal nerve (fifth cranial nerve CN V ).
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Madonna painting on caterpillar silk, Chester Cathedral. Cobweb painting, sometimes known as gossamer painting, is the delicate process of painting on canvases made from caterpillar and spider webs that have been collected, layered, cleaned, and framed.
Cobweb art is a form of art which creates different pictures from cobwebs. The main material used is cobweb, which the artist collects and processes. [citation needed] Andranik Avetisyan (Ado) [1] has not created canvas from cobweb, [2] but is the first artist to create pictures from cobweb. [3] Avetisyan's works [4] are made of real cobweb. [5]
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.
Cause of greying is incompletely understood. It is a complex multi-factorial process mainly considered to be an interplay of nutritional, genetic and environmental factors. Stress causing over-activation of the sympathetic nervous system increases noradrenaline release in hair follicles .