(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.
Reef
Definition:
(n.) A chain or range of rocks lying at or near the surface of the water. See Coral reefs, under Coral.
(n.) A large vein of auriferous quartz; -- so called in Australia. Hence, any body of rock yielding valuable ore.
(v. t.) That part of a sail which is taken in or let out by means of the reef points, in order to adapt the size of the sail to the force of the wind.
(v. t.) To reduce the extent of (as a sail) by roiling or folding a certain portion of it and making it fast to the yard or spar.
Example Sentences:
(1) One of the main users is coastal planning organizations and conservation organizations that are working on coral reefs.
(2) It is resilient, but like all reefs around the world, it is also facing challenges.
(3) What are the major threats that face the world's coral reefs and what more needs to be done to protect them?
(4) Greg Hunt , the environment minister, said he will use the existing Great Barrier Reef Marine Park Authority act to “put in place this ban in legislative form”.
(5) World Wildlife Fund Great Barrier Reef campaigner Richard Leck said it was a sad day for the reef and anyone who cared about its future.
(6) But the Guardian can now reveal Australia will also need to report on how it is dealing with the current bleaching, where almost a quarter of the coral on the reef has been killed.
(7) The federal court is being asked to overturn the environment minister, Greg Hunt’s approval of Indian company Adani’s $16.5bn Queensland coalmine because he did not take into account the impact on the Great Barrier Reef of the greenhouse gases emitted when the coal is burned.
(8) But it welcomed Australia’s 2050 long-term sustainability plan for the reef , which includes an 80% cut in water pollution by 2025 and an extra $200m (AUD) to accelerate that progress in the next five years.
(9) Guillermo Diaz-Pulido, a Griffith University associate professor, said the research was “a major step forward in understanding how seaweeds can harm corals and has important implications for comprehending the consequences of increased carbon dioxide emissions on the health of the Great Barrier Reef”.
(10) Warming water will make it hard for many of the reef’s corals to survive, while the acidification of the oceans will hinder the ability of remaining corals to form their skeletons.
(11) A recent study suggests that coral disease is doubled when dredging occurs near reefs, although supporters of the dredging have repeatedly insisted it can be done safely and that the Abbot Point sediment will be dumped around 40km from the nearest reef.
(12) This process hinders the ability of corals to produce the skeletal building blocks of reefs.
(13) So are you optimistic then about the future survival of the world's coral reefs in the long term?
(14) They want to send a very clear message to China that they are serious about this.” Facebook Twitter Pinterest This image from the US navy purportedly shows Chinese dredging vessels in the waters around Mischief reef in the disputed Spratly archipelago in May 2015.
(15) He can come any time he likes, he’s absolutely welcome to come to Australia, to come to Queensland and to come to the Great Barrier Reef,” she said in Brisbane.
(16) Facebook Twitter Pinterest Coral bleaching on the Great Barrier Reef worse than for decades The photos were taken from around Lizard Island by Lyle Vale from Coral Watch at the University of Queensland .
(17) The prime minister has been urging all Australians to remain calm in the face of increased terrorism threats,” said the society’s reef campaign director, Felicity Wishart.
(18) So we looked at the economic contribution of tourists to that area and compared it with the cost of interventions to improve water quality and coral reef health in that area.
(19) Chinese authorities said earlier they had monitored, followed and warned US warship USS Lassen as it “illegally” entered waters near the disputed reefs, and urged Washington to “immediately correct its mistake”.
(20) It was the fourth mass bleaching to hit the reef in recorded history – all since 1998 – and coral scientists are alarmed the increasing regularity of these events gives stressed coral precious little chance to recover.