| 单词 | aragonite |
| 例句 | I didn't want a little brown aragonite figurine of T. rex, with its mouth open and its teeth bared, nor did I want the Dinosaurs of the Cretaceous Period poster. It All Comes Down to This 2017-07-11T00:00:00Z These animals lack a calcareous shell but possess aragonite spicules on their epidermis. Fundamentals of Biology 2015-01-01T00:00:00Z These animals lack a shell but have aragonite spicules on their skin. Concepts of Biology 2013-04-25T00:00:00Z The mollusc deposits layers of aragonite and conchiolin, which together form nacre, also know as mother-of-pearl. How India is building a pearl farming industry 2022-09-05T04:00:00Z Calcite and closely-related polymorph aragonite are secreted by organisms to form shells and physical structures like corals. An Introduction to Geology 2017-01-01T00:00:00Z She also studied what would happen to aragonite, a mineral in seawater that marine organisms need to build shells around themselves. How a small nuclear war would transform the entire planet 2020-03-15T04:00:00Z The same chemical reactions also reduce the availability of calcite and aragonite, two carbonate minerals that are needed for the shell-building process. CO2 is killing the ocean, too 2018-09-13T04:00:00Z This estimate provides evidence that near-future reductions in the aragonite saturation state will compromise the ecosystem function of coral reefs. Carbon dioxide addition to coral reef waters suppresses net community calcification 2018-03-13T04:00:00Z Mucci, A. The solubility of calcite and aragonite in seawater at various salinities, temperatures, and one atmosphere total pressure. Meridional overturning circulation conveys fast acidification to the deep Atlantic Ocean 2018-02-11T05:00:00Z The components include aragonite, a mineral similar to and commonly replaced by calcite, and silica. An Introduction to Geology 2017-01-01T00:00:00Z In two to five years after the nuclear conflict, the cold dark oceans would start to contain less aragonite, putting the organisms at risk, the team has reported2. How a small nuclear war would transform the entire planet 2020-03-15T04:00:00Z This caused one particular nutrient needed for the formation of calcite and aragonite—calcium—to flood the oceans, which further fueled the evolution of skeletons, the team reports this month in Geology. How did animals get their skeletons? 2016-11-15T05:00:00Z The skeletons of hard corals are made of aragonite, a calcium carbonate mineral. World War II, Opium Wars recorded in ocean’s corals 2016-05-31T04:00:00Z The dark brown fossils—composed of aragonite and other minerals—appear to be swimming through the pale stone. 4 Kitchen-Countertop Stones That Go Beyond Granite 2016-01-20T05:00:00Z Calcite is often precipitated by organisms as a polymorph called aragonite. An Introduction to Geology 2017-01-01T00:00:00Z In the simulations, some of the biggest changes in aragonite happened in regions that are home to coral reefs, such as the southwestern Pacific Ocean and the Caribbean Sea. How a small nuclear war would transform the entire planet 2020-03-15T04:00:00Z Further analysis using high-resolution microscopes showed that the shells' levels of aragonite - a mineral based on calcium, carbon and oxygen - are consistent with those after roasting the shells for a prolonged time. Earliest evidence of snail-eating 2014-08-21T04:00:00Z In other words, the system is in equilibrium and shells made of aragonite will not tend to dissolve. The future of the oceans: Acid test 2013-11-21T16:03:53Z Seawater from these depths is more corrosive to aragonite, the type of calcium carbonate that forms pteropod shells. Antarctic marine life threatened 2012-11-25T18:13:39Z Marine invertebrates such as corals and clams precipitate aragonite or calcite for their shells and structures. An Introduction to Geology 2017-01-01T00:00:00Z In the modern sea only aragonite and calcite are stable minerals and therefore can form directly by precipitaton from the water. The Mysterious Microbial Origin of Mountains 2012-06-21T16:45:02.283Z If the aragonite saturation state falls below a value of 1, a condition known as undersaturation, all calcium carbonate shells will dissolve. A Rising Tide of Acid Off California 2012-06-14T19:05:43Z Their calcium or aragonite skeletons will cease growing or become too brittle to resist the eroding effects of waves. The Great Barrier Reef, RIP? 2011-10-12T00:22:01Z Beneath the surface they found small particles of aragonite, a calcium carbonate mineral. Microbial Mat Bears Direct Evidence of 3.3 Billion-Year-Old Photosynthesis 2011-07-06T19:45:00.520Z One of the projected impacts of ocean acidification is a decline in the availability of carbonate, which many sea creatures extract to form aragonite and calcite. Driving needs 2011-05-27T14:03:39Z Speiser says he hopes the chitons' unusual aragonite eyes may even inspire optical engineers designing bifocal lenses for glasses or cameras. 'Rock Eyes' Help Mollusk See Above Water 2011-04-14T17:00:00Z If the aragonite saturation state falls below 1.5, some organisms such as oyster larvae are unable to harvest enough aragonite to build shells during the first days of their lives, and they typically succumb quickly. A Rising Tide of Acid Off California 2012-06-14T19:05:43Z From a solution of calcium carbonate in water containing carbon dioxide crystals of calcite are deposited at the ordinary temperature, but from a warm solution aragonite crystallizes out. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Like aragonite it is very frequently twinned, the compound crystals being pseudo-hexagonal in form. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Many limestones are rich in aragonite, but this in course of time tends to recrystallize as calcite. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" When twinned on the prism planes o, as is frequently the case, the crystals simulate hexagonal symmetry still more closely, as in the minerals aragonite and chrysoberyl. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Perhaps just as bad, however, aragonite saturation will fall below 1.5 for large chunks of each year. A Rising Tide of Acid Off California 2012-06-14T19:05:43Z In the first class 74 are included sulphur and ammonium nitrate; monotropy is exhibited by aragonite and calcite. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Cerussite crystallizes in the orthorhombic system and is isomorphous with aragonite. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Calcium carbonate may crystallize in either of two forms, calcite or aragonite. A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Lower Miocene.—Rock salt; blue marl, containing petroleum and bitumen; flintstone; ferruginous clay, mixed with aragonite and bituminous schists; ferruginous and silicious sandstone. Scientific American Supplement, No. 647, May 26, 1888 The left side shows the depth of aragonite saturation, and the right side shows the surface ocean pH. A Rising Tide of Acid Off California 2012-06-14T19:05:43Z The tales about the crimes which have been connected with the history of great pieces of the aragonite stone332 remind us of the stories about the greatest diamonds yet found. Folkways A Study of the Sociological Importance of Usages, Manners, Customs, Mores, and Morals Thus calcspar is in the 2nd, or hexagonal, whilst aragonite is in the 4th, the rhombic, system, yet both are the same substance, viz.:—carbonate of lime. The Chemistry, Properties and Tests of Precious Stones In the first place, it should be understood that both conchiolin and aragonite are translucent, that is, they pass light to a certain extent. A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public In the animal kingdom it occurs as both calcite and aragonite in the tests of the foraminifera, echinoderms, brachiopoda, and mollusca; also in the skeletons of sponges and corals. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Being isomorphous with aragonite, it crystallizes in the orthorhombic system, but simple crystals are not known. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In all cases the original box work has been in thin sheets of calcite, and the heavy varieties are due to later deposits of calcite and aragonite crystals or, pop corn. Cave Regions of the Ozarks and Black Hills Dolomite occurs to a limited extent as such; most of it, being in the form of gurhofite crystals, may be occasionally found with aragonite of a light pearly gray color and rhombohedral crystals. Scientific American Supplement, No. 415, December 15, 1883 It is rhombohedral in its crystallization, and thus distinguished from aragonite. The Gutenberg Webster's Unabridged Dictionary Section C It is probable that if the operation were to take place under the influence of heat, under the conditions above mentioned, aragonite would be formed. Scientific American Supplement, No. 286, June 25, 1881 On observing it under polarized light the calcareous substance is discovered to be everywhere crystallized, and this suggests the question whether the carbonate has here taken the form of aragonite or of calcite. Scientific American Supplement, No. 286, June 25, 1881 |
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