(n.) A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.
Example Sentences:
(1) The calcium carbonates-calcite, aragonite, and vaterite-constitute most of the remainder of the calculi.
(2) It is suggested that these substances may be vaterite and aragonite.
(3) Its absence in all analyzed invertebrate tissues (including calcitic, aragonitic, and apatitic mineral phases) indicates that matrix protein-bound gamma-carboxyglutamic acid is not obligatory for the calcification process in the invertebrates.
(4) Skeletal walls of more than one mineralogy have the magnesium-rich layer (calcite) surrounding the living chamber and the strontium-rich layer (aragonite) on the outside.
(5) The biocompatibility of mammal bone with aragonite and calcite skeletons of aquatic invertebrates (Corals, Molluscs) led us, after animal experimentation, to implant in humans artificial dental roots derived from such invertebrates.
(6) Toothpastes contain substances which promote dental health, such as abrasives (silicium dioxide, brushite, calcite, calcite and aragonite, gibbsite etc.
(7) But because cold water absorbs CO2 more quickly, the study predicts that levels of aragonite will fall by 60% to 80% by 2095 across the northern hemisphere.
(8) Aragonite seems to be formed slowly in undisturbed conditions.
(9) A gallstone of almost perfect octahedral symmetry was composed of a mixture of crystallites of the three polymorphous forms of calcium carbonate: calcite, aragonite, and vaterite.
(10) Peak milk yield paralleled dry matter intake and was higher when calcite flour and aragonite provided .9% calcium, intermediate when all sources provided .6% calcium, and lower when albacar provided .9% calcium.
(11) Dumbbell-like concretions of aragonite predominate during pregnancy and pseudopregnancy.
(12) The presence of calcite, aragonite and iron-containing pigment materials in the concretion is suggested.
(13) The variation in the amount of calcium carbonate formed with time was studied by weighing the precipitate, and the percentages of calcite, vaterite, and aragonite were determined by x-ray diffraction (XRD) analysis.
(14) But in our gallstone series in man, aragonite was most commonly found, with an occurrence rate of 90.6%, while that of calcite was 62.5%.
(15) In contrast, the distribution of gamma-carboxyglutamic acid in the vertebrates has been further extended by this study to include an apatitic shark tooth and an aragonitic fish otolith.
(16) Moreover three cases contained all three forms of calcium carbonate polymorphs; calcite, aragonite and vaterite.
(17) Such acidification spells problems for coral reefs, which rely on calcium minerals called aragonite to build and maintain their exoskeletons.
(18) The crystalline phases at the first few lamellae were mostly imperfect while the whole nacreous layer acquitted itself into a highly oriented biomineralized aragonite.
(19) The three cholesterols-cholesterol monohydrate, anhydrous cholesterol, and cholesterol II-account for 71% of the total crystalline material in the stones; the calcium carbonates-vaterite, aragonite, and calcite-contribute 15%, and calcium palmitate contributes 6%.
(20) It says that levels of aragonite, the type of calcium carbonate which is essential for marine organisms to make their skeletons and shells, will fall worldwide.
Coralloid
Definition:
(a.) Having the form of coral; branching like coral.
Example Sentences:
(1) Myxococcus coralloides D produced cell-bound deoxyribonucleases (DNases) during the exponential phase of growth in liquid medium.
(2) A strain of Myxococcus coralloides producing an antibiotic capable of inhibiting growth of Gram-positive bacteria was isolated.
(3) Myxococcus coralloides D was lysogenic for a defective prophage.
(4) DNA was prepared from cyanobacteria freshly isolated from coralloid roots of natural populations of five cycad species: Ceratozamia mexicana mexicana (Mexico), C. mexicana robusta (Mexico), Dioon spinulosum (Mexico), Zamia furfuraceae (Mexico) and Z. skinneri (Costa Rica).
(5) Mature arbuscules exhibited a coralloid morphology which resulted in a considerable increase in the surface area of the endophyte exposed within the host cells.
(6) Myxococcus fulvus, Myxococcus coralloides and Archangium gephyra occurred in all biotops studied.
(7) Two methods for the isolation of an antibiotic produced by Myxococcus coralloides have been developed: the chloroform extraction method and the charcoal adsorption method.
(8) Starch isolated from the fungi Hericium ramosum and Hericium coralloides differs from that of higher plants in that it consists only of short-chain amylose molecules (32 to 45 glucose units long).
(9) On the other hand, a similar comparison of cyanobacteria freshly collected from a single Encephalartos altensteinii coralloid root and from three independently subcultured isolates from the same coralloid root revealed that these were likely to be one and the same organism.
(10) The effect of inorganic phosphate concentrations on antibiotic and extracellular protein production by Myxococcus coralloides D have been examined.
(11) Either coralloid or bulbous rhizoids form in plant material, but only the latter in axenic culture.
(12) Acid and alkaline phosphatase of Myxococcus coralloides were examined during vegetative growth in a liquid medium.
(13) In forest soils Myxococcus coralloides and Myxococcus fulvus occur frequently, in grassland soils Myxococcus coralloides and Archangium gephyra are predominating.
(14) 5S rRNA sequences were determined for the myxobacteria Cystobacter fuscus, Myxococcus coralloides, Sorangium cellulosum, and Nannocystis exedens and for the radioresistant bacteria Deinococcus radiodurans and Deinococcus radiophilus.
(15) We found msDNA in other myxobacteria, including Myxococcus coralloides, Cystobacter violaceus, Cystobacter ferrugineus (Cbfe17), Nannocystis exedens, and nine independently isolated strains of M. xanthus.
(16) A strain of Myxococcus coralloides was isolated which produced an antibiotic active against Gram-positive bacteria and also against Neisseria sp at high levels of antibiotic.
(17) Thus, a wide range of Nostoc strains appear to associate with the coralloid roots of cycads.