ライフサイエンスコーパス: calcite

1 dium with a homogeneous flow characteristic (calcite).

2 hey also contain the denser CaCO3 polymorph, calcite.

3 letal structure which is composed of high Mg-calcite.

4 rallel to the surface and edge directions of calcite.

5 d adequately as a simple mixture of Ap-P and calcite.

6 and of their connection, on atomically flat calcite.

7 erived from the atmosphere, precipitating as calcite.

8 edominance of modern carbon in the pedogenic calcite.

9 forms vaterite that subsequently converts to calcite.

10 O2 into a capillary tube packed with crushed calcite.

11 t is slightly undersaturated with respect to calcite.

12 in producing a two-stage dissolution in the calcite.

13 ent in the mineral ore fractions, as well as calcite.

14 they are dominated by the dissolution of Mg-calcite.

15 Na2O 0.9 vs 3.7% wt), and less sodalite and calcite.

16 CO(2) solubility enhanced by dissolution of calcite.

17 in the groundwater had coprecipitated in the calcite.

18 escribe the reversible sorption of Ca(2+) on calcite.

19 (HP) and super hydrophobic (SHP) coatings on calcite.

20 drated amorphous calcium carbonate (ACC) --> calcite.

21 biogenic systems, to generate high-magnesian calcite.

22 and the stepped {3148} and {31216} planes of calcite.

23 e sites that is typical for high-temperature calcite.

24 amically stable calcium carbonate polymorph, calcite.

25 origin of the superior hardness of biogenic calcite.

26 ated Zn(2+) sorbed to ferrihydrite (37-46%), calcite (0-37%), amorphous SiO2 (0-21%), and organic-P (

27 ing of the prepared molecular triangles on a calcite(10.4) surface shows individual molecules arrange

28 u atomic force microscopy (AFM) to probe the calcite (104) - water interface in the presence of NaNO3

29 ents, we investigated the interaction of the calcite (104) surface with a dilute Pb- and EDTA-bearing

30 clear epitaxial relation of cerussite to the calcite (104) surface.

31 taxial Pb-rich calcite solid-solution at the calcite (104)-water interface.

32 red by decreasing phase stability, are: 20% calcite, 6% aragonite, 60% high-Mg calcite, and 14% a

33 we show that dissolved Sb can interact with calcite, a widespread carbonate mineral, through a coupl

34 Calcite, a widespread natural mineral at the Earth's sur

35 e, the carbonation product was identified as calcite according to the observations of SEM, XEDS, and

36 values of reaction rates and surface area of calcite, adsorption surface areas and equilibrium consta

37 umn ozone using 2.1 Tgy(-1) of 275-nm radius calcite aerosol.

38 te with some vaterite after 1 week, and pure calcite after 2 weeks.

39 the dominant bedrock, showed that accessory calcite and (to a lesser extent) apatite were important

40 of soil is enhanced and mineral contents of calcite and anorthite in soil are increased substantiall

41 cium carbonate, amorphous calcium phosphate, calcite and apatite at various skeletal locations, as we

42 rbonate from their guts ("low" and "high" Mg-calcite and aragonite), but that very fine-grained (most

43 ow that carbonate minerals consist mainly of calcite and aragonite, with minor ankerite and dolomite.

44 ion state of As and its distribution between calcite and coexisting Fe-oxyhydroxides was unravelled b

45 ges in fluid composition through CO2-induced calcite and dolomite dissolution.

46 the Duperow Dolomite, causing dissolution of calcite and dolomite that result in the formation of a p

47 chemical reactions with the host formations (calcite and dolomite), in addition to the extensively st

48 ned using solutions in equilibrium with both calcite and fixed p(CO2(g)) values (from 10(-5) to 10(-2

49 rganic minerals as microwave residue (mainly calcite and kaolinite) from organic matter, and hence th

50 he precipitation of metal carbonates such as calcite and otavite based on biologically induced minera

51 odate was the main species incorporated into calcite and this incorporation process could be impeded

52 Ex situ Raman spectroscopy identified both calcite and vaterite as CaCO3 polymorphs; however, vater

53 erial which diffracts as a single crystal of calcite and yet fractures as a glassy material.

54 isms of formation of biogenic high-magnesian calcites and indicate that precise control over the wate

55 e: 20% calcite, 6% aragonite, 60% high-Mg calcite, and 14% amorphous carbonate.

56 at N. dutertrei adds a significant amount of calcite, and nearly all Mg-bands, after the final chambe

57 gnificantly harder (30%) and less stiff than calcite, and retains these properties after heating to e

58 otopically heavier or lighter than abiogenic calcite, and that the size of the deviation is determine

59 These marbles include both calcite- and dolomite-rich examples and display similar

60 this approach to resolve the long-standing "calcite-aragonite problem"--the observation that calcium

61 These adsorbed ions on calcite are not remobilized when CO2 is intruded into th

62 sorption of Se(IV) and As(V) if goethite and calcite are sufficiently available in underground layers

63 d of Silurian dolomite and Ketton limestone (calcite) arranged in series.

64 ads to uniform nanoparticle occlusion within calcite at up to 7.5% w/w (16% v/v), while minimal occlu

65 ystems are based on the reaction of AMD with calcite-based permeable substrates followed by decantati

66 e have combined this hydrogel network with a calcite biomineralization process to stabilize soil.

67 mud leachate results in the precipitation of calcite, both in experiments and in field samples recove

68 mes more barium than the solubility limit in calcite but also displays the rotational disorder on car

69 g artifact resulting in the precipitation of calcite by degassing CO2, had the unintended consequence

70 Pb(2+) relative to Ca(2+) is accommodated in calcite by vertical displacements of Pb relative to the

71 bidirectional crystal growth parallel to the calcite c axis to growth along the three a axes.

72 approximately 100 nm wide pores parallel to calcite c-glide or (120) planes, which may have provided

73 17 A, the same as a unit-cell dimension for calcite (c-axis = 17.062 A), interleaved with amorphous

74 nspired synthesis of a highly supersaturated calcite (Ca0.5 Ba0.5 CO3 ) called balcite is reported, a

75 he methods are demonstrated here on geologic calcite (CaCO(3)) and used to investigate the prismatic

76 For the case of calcite (CaCO3 ) in water, computer simulations have bee

77 a amended with urea and CaCl2 and/or SrCl2 , calcite (CaCO3 ), strontianite (SrCO3 ), vaterite in dif

78 Specifically, we calculate that injection of calcite (CaCO3) aerosol particles might reduce net radia

79 ipitates showed they were composed solely of calcite (CaCO3) and over 90% Ca could be removed from th

80 contrasting system, the epitaxial growth of calcite (CaCO3) crystals on organic self-assembled monol

81 w the same ACC phases that are precursors to calcite (CaCO3) formation in sea urchin spicules, and no

82 of the bulk transformation of single-crystal calcite (CaCO3) into polycrystalline cerussite (PbCO3) t

83 hydration of CaO formed after calcination of calcite (CaCO3) single crystals is a pseudomorphic, topo

84 Calcite (CaCO3) was identified as the main product accor

85 n new understanding of additive occlusion in calcite (CaCO3), and to link morphological changes to oc

86 hese two types of anionic nanoparticles into calcite (CaCO3), which serves as a suitable model host c

87 We combine both organic and calcite carbon isotope analyses of individual specimens

88 mplying the formation of an otavite-siderite-calcite (CdCO3-FeCO3-CaCO3) mixed mineral phase.

89 leyi, a globally distributed haptophyte with calcite coccoliths that comprise ca. 50% of the sinking

90 Calcite content as low as 10% can mitigate the effect of

91 The relation between the rounded calcite core and the surrounding lath-shaped cerussite a

92 to a thin shell of nanoparticles on a solid calcite core.

93 followed by the replacement of the remaining calcite core.

94 tion of contact angles, at the pore scale in calcite cores from a producing hydrocarbon reservoir at

95 s of reaction, amorphous silica, rather than calcite, covered the wollastonite surface and acted as a

96 of dislocations present within an individual calcite crystal during repeated growth and dissolution c

97 sulting materials were used as scaffolds for calcite crystal growth.

98 aphical imaging of subtle etch features in a calcite crystal surface.

99 t very fine-grained (mostly < 2 mum) high Mg-calcite crystallites (i.e., > 4 mole % MgCO(3)) are thei

100 mic driving force for the transformations is calcite crystallization, yet it is gated by specific com

101 The calcite crystals are imaged to simultaneously visualize

102 Using calcite crystals co-precipitated with polymers as a suit

103 Individual calcite crystals exhibit asymmetrical dumbbell shapes an

104 defined, nanoliter volumes, we observed that calcite crystals form via an amorphous precursor phase.

105 Surprisingly, the first calcite crystals formed are perfect rhombohedra, and the

106 efringent alpha-barium borate (alpha-BBO) or calcite crystals that overcome the aberrations and disto

107 ed growing as chemically stable rock-forming calcite crystals with rough edges.

108 o create mutable surfaces based on arrays of calcite crystals, in which one end of each crystal is im

109 are comprised of a loose prismatic fabric of calcite crystals.

110 he shell due to structural disorientation of calcite crystals.

111 nate) (PSS) on the early stages of growth of calcite crystals.

112 ibrium can alter the chemical composition of calcite deeper than one monolayer into the crystal.

113 Further cross-wavelet analyses between our calcite delta(18)O and atmospheric (14)C show statistica

114 r indicated a better correlation between our calcite delta(18)O record and atmospheric (14)C than bet

115 ncluding delta(18)O of benthic foraminiferal calcite (delta(18)Oc).

116 esent uranium-series disequilibrium dates of calcite deposits overlying or underlying art found in 11

117 l calcite was preserved by a balance between calcite dissolution and cerussite growth controlled by a

118 Groundwater pH, calcite dissolution and redox condition are factors cont

119 An alternative process consists of calcite dissolution by slurry flow of micron-size calcit

120 Calcite dissolution can increase pH slightly and cause A

121 ajor ion chemical reactions are dominated by calcite dissolution following proton release from pyrite

122 Near-equilibrium calcite dissolution in seawater contributes significantl

123 rmula: see text] is a rate-limiting step for calcite dissolution in seawater.

124 bout the detailed mechanisms responsible for calcite dissolution in seawater.

125 High-PCO2 brine has a faster calcite dissolution kinetic rate because of the accelera

126 e transport and surface reaction controls on calcite dissolution under elevated pCO2 conditions.

127 ing allowed following the coupled process of calcite dissolution, nucleation of precipitates at the c

128 intruded into the system, but it intensifies calcite dissolution.

129 n of cadmium and copper could be promoted by calcite dissolution.

130 r, flow channeling, and increasingly limited calcite dissolution.

131 trapping can occur under conditions in which calcite dissolves.

132 In specific, magnesian calcite dominated in low [Mg(2+)]/[Ca(2+)] solutions but

133 Se((IV))), selenium can be incorporated into calcite during growth.

134 In contrast, Zn species associated with calcite (either adsorbed or incorporated in the structur

135 cal and isotopic microenvironment, coccolith calcite exhibits large and enigmatic departures from the

136 precursor minerals phases (quartz, feldspar, calcite), "feldspathic-rich" glass, "average" melt glass

137 fractures (vug) are colored cyan whereas the calcite-filled fractures (high density objects) are colo

138 The carbon isotope composition of calcite formed during this seismic cluster records rapid

139 Here we show that high Mg/Ca-calcite forms at night in cultured specimens of the mult

140 the natural and control material, higher Mg calcite forms clear concentric bands around the algal ce

141 While biogenic calcites frequently contain appreciable levels of magnes

142 synthetically to precipitate high-magnesian calcite from solution.

143 ence preserved in precisely dated subglacial calcites from close to the East Antarctic Ice-Sheet marg

144 We thus propose that, within calcite gouge, ultra-low clay content (</=3 wt.%) locali

145 t </=3 wt.%) micro-layers weaken faster than calcite gouges or mixed calcite-phyllosilicate gouges.

146 t, at seismic slip rates (1 ms(-1)), similar calcite gouges with pre-existing phyllosilicate-bearing

147 rotocol has been developed to date earthworm calcite granules from the reference loess sequence of Nu

148 Calcite grows epitaxially on {0001} portlandite surfaces

149 s exhibit both a high degree of control over calcite growth morphology and an unprecedented 23-fold a

150 icrokinetic model that accurately reproduces calcite growth over a very wide range of published exper

151 te a model that predicts overall macroscopic calcite growth rates.

152 ensated metabolism of proteins and increased calcite growth.

153 The role of calcite heterogeneous nucleation was studied in a partic

154 le and deformable array of three-dimensional calcite heterostructures that are partially locked in si

155 The abundance of high-magnesium calcites (HMC) dominates over aragonite (Arag) and low-m

156 lower than the interfacial energy governing calcite homogeneous nucleation (alpha approximately 120

157 Calcite-hosted fluid inclusions, inferred to represent a

158 ined by the different apparent solubility of calcite in free drift systems.

159 Because of the large diffusion of calcite in the environment, this phase may exert an impo

160 model is used to predict the contribution of calcite in the overall sorption of Cd(II) on a natural a

161 In this paper, we dissolve (13)C-labeled calcites in natural seawater.

162 The production of high-magnesian calcites in vitro is highly challenging, because Mg-free

163 entially on the acute-stepped {3148} face of calcite, in agreement with experiment.

164 etation is proposed where the dissolution of calcite increases the calcium concentration in a thin bo

165 fluorescence) and delta(18)O from authigenic calcite indicate a centennial-scale arid interval betwee

166 gh the increase in dissolved P is greater if calcite is absent or if the particles are externally mix

167 materials generally observed when magnesian calcite is formed synthetically.

168 fixation ratio determines whether coccolith calcite is isotopically heavier or lighter than abiogeni

169 al structure of the confined atomically flat calcite is resolved in aqueous solution.

170 High Mg-calcite is, however, the most soluble form of calcium ca

171 (79-96%), occurs whether calcium carbonate (calcite) is present or not, although the increase in dis

172 ging, because Mg-free aragonite, rather than calcite, is the favored product in the presence of stron

173 ntative solids including quartz, microcline, calcite, kaolinite, phlogopite, and illite under a range

174 eral-dissolution rate constants compiled for calcite, kaolinite, smectite, anorthite, albite, K-felds

175 s from the isotopic composition of abiogenic calcite, known as vital effects.

176 itecture of crystallographically co-oriented calcite lamellae.

177 dehydrated forms of ACC in the aragonite and calcite layers of Mytilus edulis shells cultured under a

178 ates over aragonite (Arag) and low-magnesium calcite (LMC) and constitutes between 36% and 50% of all

179 Recent studies demonstrated that synthetic calcite may host considerable amounts of arsenic (As).

180 Fundamentally, the loss of Mg in the calcite may reduce elasticity thereby changing the struc

181 nd reprecipitation and yields high-magnesian calcite mesocrystals with Mg contents as high as 53 mol

182 raphical changes during the dissolution of a calcite microcrystal in aqueous solution.

183 Calcite microfossils are widely used to study climate an

184 Brucite-calcite mineral assemblages precipitated from mixed flui

185 x, which mainly contains smectite/illite and calcite minerals, is also studied together with the pure

186 pine comprises a highly oriented array of Mg-calcite nanocrystals in which amorphous regions and macr

187 thalpy measurement of ethanol on a series of calcite nanocrystals, with the aim of mimicking organic-

188 of the slipping zones reveal the presence of calcite nanograins and amorphous carbon.

189 of dyes, whose fluorescence cascade creates calcite nanoparticles that fluoresce white.

190 Such an ordered assembly of ethanol on calcite NP is analogous to, although less strongly bonde

191 rected] ion concentrations, showing that the calcite nucleation barrier surpasses that of metastable

192 Here we quantify the kinetics of calcite nucleation onto a suite of high-purity polysacch

193 We first measure the kinetics of calcite nucleation onto model substrates that present di

194 As the high-magnesium calcite of the echinoderm skeleton is a biomineral form

195 recovery in the enhanced recovery stage from calcite oil wells is a major global challenge for oil in

196 ter carbonate saturation state (for CaCO3 as calcite (Omegacal )) in all taxa.

197 ating solutions that are supersaturated with calcite (Omegacalcite = 13), demonstrated that Zn, ortho

198 The reactivity of calcite, one of the most abundant minerals in the earth'

199 as their skeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbon

200 thening and toughening the otherwise brittle calcite optical lenses found in the brittlestar Ophiocom

201 e occurrences worldwide are dominated by Ca-(calcite) or Mg-(dolomite)-rich magmatic carbonates.

202 Bridging of calcite particles between the algal cells led to rapid a

203 desalinated water consists of dissolution of calcite particles by flow of acidified desalinated water

204 te dissolution by slurry flow of micron-size calcite particles with acidified desalinated water.

205 er through a bed packed with millimeter-size calcite particles.

206 lting in several species incorporated in the calcite phase either substituting at the Ca(2+) site or

207 s weaken faster than calcite gouges or mixed calcite-phyllosilicate gouges.

208 Coccoliths, readily preserved calcite plates produced by a group of single-celled surf

209 tionale for size-normalizing the mass of the calcite plates produced by the most abundant family of c

210 tion reactions; (2) dissolution of available calcite plays a critical role in buffering pH; (3) high

211 be frequently misinterpreted, and that these calcite/polymer crystals do not have nanoparticle substr

212 computational domain consisting of reactive calcite, pore space, and the capillary wall constructed

213 samples were found to have large amounts of calcite precipitate which were likely formed as a result

214 a result of very rapid As scavenging by the calcite precipitate.

215 rmed Al oxyhydroxides, EXAFS analysis of the calcite precipitates revealed only isolated arsenate tet

216 Microbially induced calcite precipitation (MICP) has been widely researched

217 Microbially induced calcite precipitation (MICP) offers an attractive altern

218 ewer than 12000 ha of urban land to maximize calcite precipitation has the potential to remove 1 mill

219 Ureolytically driven calcite precipitation is a promising approach for induci

220 vity during evolution of urea hydrolysis and calcite precipitation reaction fronts within a silica ge

221 Calcite precipitation results in 86% Al and 81% As remov

222 e media by the fungal biomass and associated calcite precipitation.

223 uding feedback due to aperture reduction via calcite precipitation.

224 lized over time by CO(2) uptake from air and calcite precipitation.

225 and the Mg is typically not preserved in the calcite product as the transformation occurs via a disso

226 colithophore skeletons enables comparison of calcite production in modern and fossil cells in order t

227 Changing coccolith thickness may affect calcite production more significantly in the dominant mo

228 nd abnormally formed otoconia (extracellular calcite-protein composites) at later stages of embryonic

229 f the iconic Devils Hole (Nevada) subaqueous calcite record exhibit shifts to interglacial values ~10

230 tailed using an annually resolved authigenic calcite record of precipitation delta(18)O from a varved

231 lusions associated with intrusive (plutonic) calcite-rich carbonatites from the ~120 Ma carbonatite c

232 ecord derived from the organic matrix in the calcite rostra of early Toarcian belemnites.

233 race concentrations of NaNO3 severely affect calcite's (104) surface and its reactivity.

234 veal density profiles of different ions near calcite's surface, with NO3(-) able to reach closer to t

235 jection strategy involved periods of lowered calcite saturation index combined with short high fluid

236 experiment, Ca concentrations increase until calcite saturation is reached at ~500 h.

237 of large quantities (approximately 750 g) of calcite; significant reduction in the transmissivity of

238 re, by means of a model biomineral made from calcite single crystals containing glycine (0-7 mol%) or

239 be studied in situ is used to produce large calcite single crystals with predefined crystallographic

240 he X-ray scattering matched that measured on calcite single crystals.

241 using Raman spectroscopy, weaknesses in the calcite skeleton, with evidence of dissolution and molec

242 ts, due to the elevated solubility of its Mg-calcite skeleton.

243 odels enabling design of remineralization by calcite slurry dissolution with carbonic and sulfuric ac

244 ding to solid-solid transformation of ACC to calcite; small part of ACC forms vaterite that subsequen

245 by regrowth of a strained epitaxial Pb-rich calcite solid-solution at the calcite (104)-water interf

246 n chemistry and geometric constraints on the calcite solid.

247 omic force microscopy is used to confine the calcite-solution interface with a silica microsphere and

248 surface adsorption or incorporation into the calcite structure, possibly as a result of very rapid As

249 force spectroscopy to independently measure calcite-substrate-binding free energies, DeltaGb.

250 for the (solely) tetravalent actinide Th on calcite, suggesting reduction of Np(V) to Np(IV) by side

251 We find that Na(+) ions precipitate to the calcite surface and form Na acetate.

252 ssolution, nucleation of precipitates at the calcite surface and growth of these precipitates.

253 ocess that occurs in a boundary layer at the calcite surface can sequester Sb as a solid phase on cal

254 literature describing the speciation of the calcite surface do not predict a significant concentrati

255 e identify a direct relationship between the calcite surface energy and solution Mg:Ca [corrected] io

256 ormula: see text] ions can also reach to the calcite surface in proximity and modify the calcite surf

257 e binding energy of oil molecule on modified calcite surface is smaller than on pure calcite surface,

258 from the nanoconfined solution, leaving the calcite surface more negatively charged than the analogo

259 microscopy (AFM) measurements on the {1014} calcite surface of monomolecular step densities, treated

260 e strongest calculated binding energy to the calcite surface that is selectively preserved.

261 where the ethanol monolayer is bonded to the calcite surface through its polar hydroxyl group, leavin

262 ffects the interactions of an AFM tip with a calcite surface, as surrogates for nanomaterials interac

263 lly charged Teflon surface and at a pristine calcite surface, where a functionalized probe is used to

264 fied calcite surface is smaller than on pure calcite surface, which enhances oil recovery.

265 the wettability alteration (less oil wet) of calcite surface.

266 main cation determining the potential of the calcite surface.

267 calcite surface in proximity and modify the calcite surface.

268 situ atomic force microscopy observations of calcite surfaces during contact with selenium-bearing so

269 th the growth of a cerussite shell on top of calcite surfaces followed by the replacement of the rema

270 of the same uranyl species on the different calcite surfaces under aqueous condition.

271 ely observed on phlogopite mica, silica, and calcite surfaces with roughness on the order of ~10 nm.

272 itial chemisorption on active sites on fresh calcite surfaces, followed by major chemical binding to

273 om the free energy profiles of the different calcite surfaces, the uranyl complex was also found to a

274 phere calcium ions larger than on unconfined calcite surfaces.

275 behavior of U(VI) in contact with different calcite surfaces.

276 ults suggested that by stabilizing magnesium calcite to inhibit aragonite deposition, PfN44 participa

277 arbonate polymorphs and stabilized magnesium calcite to inhibit aragonite deposition.

278 the ratio of the effective reaction rate of calcite to that of dolomite decreases with time, indicat

279 ort carbon in the form of organic matter and calcite to the sea floor, they also release CO2 in the c

280 However, an amorphous-to-calcite transformation is not observed.

281 In fact goethite and calcite, two minerals frequently found in aquifers, coul

282 ntiate between the formation of vaterite and calcite, two polymorphs of CaCO3.

283 ignature of transport-limited dissolution of calcite under extreme disequilibrium.

284 nstrate that arsenic can be found in natural calcite up to 2 orders of magnitude over the normal crus

285 ncluding zeolites, metal-organic frameworks, calcite, urea and l-cystine.

286 ls that were demonstrated as precipitates of calcite using synchrotron FTIR.

287 We present the results of U-Th dating of calcite veins in the Loma Blanca normal fault zone, Rio

288 microbial colonies are fossilized in brucite-calcite veins that are strongly enriched in organic carb

289 is paper, the concentration of As in natural calcite was determined using two novel, specifically des

290 The formation of vaterite with some calcite was observed after 1 day, calcite with some vate

291 The external shape of the original calcite was preserved by a balance between calcite disso

292 )), precipitates were observed forming while calcite was still dissolving.

293 tron x-ray beam, we drove dissolution at the calcite/water interface and simultaneously probed the dy

294 carboxylated polystyrene spheres along with calcite, whereas aragonite forms in solution via homogen

295 surface can sequester Sb as a solid phase on calcite, which has environmental implications as it may

296 e environments, rather than the stable phase calcite--which is of tremendous relevance to biominerali

297 e, by investigating micelle incorporation in calcite with atomic force microscopy and micromechanical

298 or Ca in the near-surface layers of strained calcite with Pb/(Pb + Ca) atom fractions as high as 0.28

299 with some calcite was observed after 1 day, calcite with some vaterite after 1 week, and pure calcit

300 hous precursor, which directly transforms to calcite without dissolution, high Mg(2+)/Ca(2+) ratios a