What's the difference between quartz and siderite?

Quartz


Definition:

  • (n.) A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.

Example Sentences:

  • (1) There fore, the adverse effects may be induced by such quartz or silicon compounds.
  • (2) We have previously shown that intratracheally instilled silica (quartz) produces both morphologic evidence of emphysema and small-airway changes, and functional evidence of airflow obstruction.
  • (3) Lung sections of rats exposed to quartz particles were significantly different.
  • (4) Exposures to quartz amounting to less than about 10 per cent of mixed coal mine dust do not generally affect the probability of developing simple pneumoconiosis.
  • (5) The effect of quartz, bentonite and coal dusts as well as the effect of the artificial mixture of these dusts on TTC reduction and extra-and intra-cellular lactate dehydrogenase activity in peritoneal rat macrophages was determined in vitro.
  • (6) Silica quartz dust, a direct toxin of macrophages, suppressed demyelination and inflammation if begun at time of virus infection.
  • (7) As expected the proportion of quartz was greater in lymph nodes and lungs from men who had worked "low" rank (high ash) coal.
  • (8) Guinea pig splenic lymphocytes and peritoneal macrophage cultures were incubated with quartz (DQ12), Corundum and aspirin as prostaglandin inhibitor.
  • (9) A surgical system using 308 nm excimer laser radiation transmitted by quartz fibers is described.
  • (10) Cancer incidence and cause-specific mortality were studied in a male cohort of 94 talc miners and 295 talc millers, exposed to non-asbestiform talc with low quartz content.
  • (11) The pulsed dye laser can effectively fragment biliary calculi when transmitted through a small-diameter quartz fiber and may be useful as a tool for fragmenting retained common duct stones.
  • (12) In mice bearing the highly metastatic tumors B16 melanoma and Lewis lung carcinoma (LLC) treated with Hpd and laser light delivered through a quartz fiber optic significantly prolonged the median survival time.
  • (13) With a long-term (1 and 4 months) introduction of an additional amount of edible fats (beef, hog fats, butter, sunflower seed oil) to intact and intratracheally quartz-dust laden sexually mature male rats an organ-specific reaction to the supply of fat, and in intact rats, also some peculiarities of the reaction depending upon the kind of the introduced fats, were discovered.
  • (14) Using a fluorescence microscope with quartz optics and an image analyser, it was possible to measure the intracellular concentration of free calcium ions [Ca2+]i in single microvessels for the first time.
  • (15) The median amount of quartz for all cases, was 0.044 grams.
  • (16) The microscope is focused on an in-line quartz flow cell incorporated down stream of a microbore HPLC column or directly on an optically clear portion of fused-silica capillary columns for analyte detection.
  • (17) X-ray diffraction data from samples of 20, 60 and 100 mug quartz on poly-vinyl chloride membrane filters have been collected using a rotating anode x-ray source.
  • (18) Mentally,” an Uber driver who used to do contract limo work told a reporter from business magazine Quartz last week, “these rating systems affect us a lot… If I am driving somebody who doesn’t live in New York, and they complain that I took the wrong route, how would they know the route that I should have taken?” He went on to note that in 20 years of working with corporate employees, he hadn’t a single customer complaining.
  • (19) There are closed relations between progressive systemic sclerosis (PSS) and exposure to quartz dust in the GDR.
  • (20) A 630 nanometer wavelength of light was delivered through a quartz-optical fiber with either a regular flat end for focal illumination or a bulb-type end which produced an isotropic light pattern.

Siderite


Definition:

  • (n.) Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.
  • (n.) A meteorite consisting solely of metallic iron.
  • (n.) An indigo-blue variety of quartz.
  • (n.) Formerly, magnetic iron ore, or loadstone.
  • (n.) Any plant of the genus Sideritis; ironwort.

Example Sentences:

  • (1) Kinetics of CO2 and O2 production was investigated in the following systems: H2O - H2O2 - C6H5OH - siderite, H2O - H2O2 - HCl - siderite, H2O - H2O2 - siderite, H2O - HCl - siderite.
  • (2) The siderite FeCO3 is also active, but the iron oxides and oxyhydroxides are generally nonactive.
  • (3) siderite, the degree of C2H6O2 to CO2 conversion was 99.2% and 99.8, respectively.
  • (4) The rate of oxygen production in the presence of phenol and siderite was described as Vo2 = k1 [H2O2]1.46.

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