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quartz Definitions

noun

the most abundant mineral on the earth's surface, of chemical composition silicon dioxide, sio2. it occurs in a variety of forms, both crystalline and amorphous. found in every environment.

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  • to give shape to "kryptos," sanborn chose polished red granite, quartz, copperplate, lodestone, and petrified wood. after reading extensively on the subject of intelligence and cryptography, mr. sanborn decided to interpret the subject in terms of how information is accrued throughout the ages. in the case of the two-part sculpture, information is symbolized in the chemical and physical effects that produced the materials and in other more literal ways. cia.gov

  • jade rollers are beloved by celebrities and instagram influencers, and while they won’t magically zap wrinkles or change your pores, dermatologists say they can help reduce puffiness. and because using a roller requires you to slow down and pamper yourself, it can also help in the stress relief department. if nothing else, this pretty rose quartz roller will look oh-so-instagram-worthy on your sink or bedside table. and if you’re looking for something on the more luxurious side, skin gym even has a rose quartz crystal face mask. everydayhealth.com

  • all rocks are mixtures of naturally occurring substances called minerals. granite is a common rock made of three differently coloured minerals called feldspar, mica, and quartz. the pink grains in granite are feldspar, the black grains are mica, and the light grey, glass-like grains are quartz. granite is usually about 75% feldspar, 5% mica, and 20% quartz. these proportions can vary and the rock often contains small amounts of other minerals as well. factmonster.com

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  • the shortt clock was replaced as the standard by quartz crystal clocks in the 1930s and 1940s. quartz clock operation is based on a property of quartz crystals. if you apply an electric field to the crystal, it changes shape, and if you squeeze or bend it, it generates an electric field. when put in a suitable electronic circuit, the crystal can vibrate and generate an electric signal that can be used to operate an electronic clock display. infoplease.com

  • roentgen did notable research in many fields of physics including the specific heats of gases, the thermal conductivity of crystals, the electrical and other characteristics of quartz, the influence of pressure on the refractive indices of various fluids, the modification of the planes of polarised light by electromagnetic influences, the variations in the functions of the temperature and the compressibility of water and other fluids, and the phenomena accompanying the spreading of oil drops on water. but when roentgen received the nobel prize in physics in 1901, the first nobel prize ever awarded in physics, it was "in recognition of the extraordinary services he has rendered by the discovery of the remarkable rays subsequently named after him." medicinenet.com

  • in the quality of life after treatment for brain metastases (quartz) trial, conducted in patients with non-small cell lung cancer with brain metastases, there was no significant difference in survival between patients randomized to receive wbrt and those receiving optimal supportive care. overall symptoms and serious side effects were also not significantly different between groups. medpagetoday.com

  • silicosis, the oldest known occupational pulmonary disease, is caused by inhalation of tiny particles of silicon dioxide in the form of unbound (free) crystalline silica (usually quartz) or, less commonly, by inhalation of silicates, minerals containing silicon dioxide bound to other elements, such as talc. workers at greatest risk are those who move or blast rock and sand (miners, quarry workers, stonecutters) or who use silica-containing rock or sand abrasives (sand blasters; glass makers; foundry, gemstone, and ceramic workers; potters). coal miners are at risk of mixed silicosis and coal workers’ pneumoconiosis. merckmanuals.com

  • enzymatic fe-s reconstitution was done using the e. coli iscse.coli and iscue.coli proteins as previously described [47,48]. all reconstitution reactions were done in an anaerobic glove box (bactron) in a 1 ml sealable quartz cuvette (hellma analytics, jena, germany). reaction mixtures contained rv1460 (50 μm), (nh4)2fe(so4)2 (25 μm), dtt (3 mm), iscse.coli (1 μm) and iscue.coli (5 μm), in 20 mm tris-hcl, 150 mm nacl, ph 8.0 in a total volume of 800 μl. the reaction was initiated by addition of 250 μm cysteine and monitored by recording uv-visible scans (250–600 nm) using an ocean optics usb4000 spectrophotometer at regular intervals. nih.gov