ライフサイエンスコーパス: calcite

1 dium with a homogeneous flow characteristic (calcite).

2 occlusion within a model inorganic crystal (calcite).

3 ttringite, and CrO(4)(2-) incorporation into calcite.

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

5 Asp is sparsely occluded within vaterite and calcite.

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

7 amically stable calcium carbonate polymorph, calcite.

8 origin of the superior hardness of biogenic calcite.

9 hey also contain the denser CaCO3 polymorph, calcite.

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

11 rallel to the surface and edge directions of calcite.

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

13 and of their connection, on atomically flat calcite.

14 erived from the atmosphere, precipitating as calcite.

15 edominance of modern carbon in the pedogenic calcite.

16 forms vaterite that subsequently converts to calcite.

17 esulted in the formation of aragonite and/or calcite.

18 O2 into a capillary tube packed with crushed calcite.

19 t is slightly undersaturated with respect to calcite.

20 equilibria also affect Delta(47) in biogenic calcite.

21 in the crystal, spontaneously transforms to calcite.

22 tion process by enabling the formation of Mg-calcite.

23 arbonate sedimentation dominated by skeletal calcite.

24 granular soils through the precipitation of calcite.

25 f non-functional silica nanoparticles within calcite.

26 usion within host inorganic crystals such as calcite.

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

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

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

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

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

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

33 ered by decreasing phase stability, are: 20% calcite, 6% aragonite, 60% high-Mg calcite, and 14% amor

34 tallographic preferred orientation (CPO) for calcite (7.4 times random orientation) and an overall we

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

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 t 165 +/- 8.3 t CO(2) were precipitated into calcite, an overall carbon storage efficiency of 72 +/-

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

41 ton, with an inner structure made of high-Mg calcite and an outer structure composed of aragonite.

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

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

44 (C(10)-C(35)) and then tested it on "clean" calcite and aragonite stalagmite samples from cave KNI-5

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

46 e invertebrate, constructs its skeleton from calcite and aragonite.

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

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

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

50 Although post-treatment distributions of calcite and engineering properties were similar between

51 When IO(3)(-) is co-mingled with CrO(4)(2-), calcite and gypsum are formed as secondary mineral phase

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

53 ed, to compare two types of railway ballast: Calcite and Kieselkalk.

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

55 ways were localised at the interface between calcite and sponge.

56 prised of the CaCO(3) polymorphs (aragonite, calcite and vaterite), which can occur either alone or i

57 quilibrium (18)O/(16)O fractionation between calcite and water ((18)alpha(cc/w)).

58 ssite or hydrocerussite), calcium carbonate (calcite), and/or calcium magnesium carbonate (dolomite).

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

60 rane, an overlying protein matrix containing calcite, and an outermost waxy cuticle(2-7).

61 e microstromatolites coated by magnetite and calcite, and can therefore be classified as oncoids.

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

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

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

65 ntury, only three polymorphs of pure CaCO(3)-calcite, aragonite, and vaterite-were known to exist at

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

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

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

69 All adult echinoderms have a calcite-based endoskeleton, a synapomorphy of the Ambula

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

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

72 e features differ from those observed at the calcite-brine interface, and for parallel measurements u

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

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

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

76 17 A, the same as a unit-cell dimension for calcite (c-axis = 17.062 A), interleaved with amorphous

77 uded pure Pb minerals and solid solutions of calcite (Ca (x)Pb(1- x)CO(3)) and apatite [Ca (x)Pb(5-x)

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

79 ybdenum tetraacetate, on the (10.4) plane of calcite (CaCO(3)).

80 of these model anionic nanoparticles within calcite (CaCO(3)): relatively short stabilizer chains me

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

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

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

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

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

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

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

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

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

90 d new insights for the competing carboxylate/calcite/calcium ion interactions.

91 e, we report the discovery of high-magnesium calcite [CaMg(CO(3))(2)] armor overlaying the exoskeleto

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

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

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

95 followed by the replacement of the remaining calcite core.

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

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

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

99 ase resistance can alter their mechanisms of calcite crystal biomineralization, promoting resilience

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

101 ctating both the extent of occlusion and the calcite crystal morphology: sufficiently long stabilizer

102 Both calcite crystal size and nanoindentation moduli were als

103 calcium depletion rate and increased average calcite crystal size.

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

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

106 asurement simulations on five representative calcite crystallographic surfaces and observed that the

107 The calcite crystals are imaged to simultaneously visualize

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

109 Using calcite crystals containing quantum dots as a model syst

110 Individual calcite crystals exhibit asymmetrical dumbbell shapes an

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

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

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

114 lso enables the rational design of patterned calcite crystals using model anionic block copolymer ves

115 for low urease activity would achieve larger calcite crystals with higher moduli.

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

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

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

119 he shell due to structural disorientation of calcite crystals.

120 spatial location of the nanoparticles within calcite crystals.

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

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

123 Here we show that calcite delta(18)O profiles of two species of modern wha

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

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

126 These periods of calcite deposition are synchronous, within dating uncert

127 Intervals of calcite deposition place tight constraints on the timing

128 n forearc is sequestered within the crust by calcite deposition.

129 The overall rate of calcite dissolution along the fracture decreased over ti

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

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

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

133 Calcite dissolution can increase pH slightly and cause A

134 Near-equilibrium calcite dissolution in seawater contributes significantl

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

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

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

138 Calcite dissolution rate quantified from the attenuation

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

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

141 at up to 93% of dissolved Ca is removed into calcite during certain phases of injection.

142 at are more temperature dependent than other calcites, enabling the effect of temperature change on M

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

144 coccolithophores and coccolithophores with a calcite exoskeleton dissolved by acidification (decalcif

145 ons provide evidence that most Earth-surface calcites fail to achieve isotopic equilibrium, highlight

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

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

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

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

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

151 on the composition of extremely slow-growing calcites from Devils Hole and Laghetto Basso (Corchia Ca

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

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

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

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

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

157 ers were subsequently used as a template for calcite growth.

158 ensated metabolism of proteins and increased calcite growth.

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

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

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

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

163 ng the loading of guest nanoparticles within calcite host crystals.

164 Calcite-hosted fluid inclusions, inferred to represent a

165 progressively transformed into aragonite or calcite in biomineralization of marine invertebrate shel

166 d oxygen isotope data of texturally distinct calcite in calc-silicate xenoliths from arc volcanics in

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

168 The discovery of biogenic high-magnesium calcite in the relatively well-studied leaf-cutting ants

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

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

171 m ion complexes prevented direct carboxylate-calcite interactions, thus lowering the AFM adhesion for

172 NanoSIMS mapping across the aragonite-calcite interface indicates an organic layer between bot

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

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

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

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

177 (79-96%), occurs whether calcium carbonate (calcite) is present or not, although the increase in dis

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

179 itecture of crystallographically co-oriented calcite lamellae.

180 te for biomineralization of aragonite on the calcite layer.

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

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

183 While all three microorganisms produced calcite, lower urease activity was associated with both

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

185 Calcite microfossils are widely used to study climate an

186 Brucite-calcite mineral assemblages precipitated from mixed flui

187 However, control over bacterial calcite morphology and material properties has not been

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

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

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

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

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

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

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

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

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

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

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

199 rbonate sediment is higher than expected for calcite or aragonite precipitating from seawater.

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

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

202 recent proposals have suggested addition of calcite particles to the stratosphere, which one model s

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

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

205 ften-assumed thin-brine wetting layer at the calcite-petroleum interface is observed.

206 The calcite-petroleum interface structure is similar whether

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

208 ved possibly indicating the development of a calcite phase.

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

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

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

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

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

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

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

216 Microbially Induced Calcite Precipitation (MICP) is a bio-mediated cementati

217 Microbially Induced Calcite Precipitation (MICP), or bio-cementation, is a p

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 The role of urea hydrolysis in enabling calcite precipitation through sustained super-saturation

221 pH and calcite saturation state, indicating calcite precipitation.

222 eriostracum), and an increased proportion of calcite (prismatic layer, as opposed to aragonite) and o

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

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

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

226 subglacial chemical precipitates of opal and calcite record accumulation of (234)U (the product of ro

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

228 filling was previously observed in synthetic calcite rhombohedra, but never in aragonite pseudohexago

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

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

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

232 tope ratios rapidly increase with the pH and calcite saturation state, indicating calcite precipitati

233 t ocean geochemistry, particularly aragonite-calcite seas, drives patterns of morphological evolution

234 New oxygen isotope data from calcite shells of the benthic fauna suggest that bottom

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

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

237 of nanoparticles can be incorporated within calcite single crystals, while maintaining the continuit

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

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

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

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

242 n chemistry and geometric constraints on the calcite solid.

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

244 The sea urchin calcite spicules are formed within a tubular cavity gene

245 Fossil coccospheres, the external calcite structure produced by the excretion of interlock

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

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

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

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

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

251 of the molecules and the confinement at the calcite surface drives the molecules to form locally ord

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

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

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

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

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

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

258 r, significant structural changes within the calcite surface, and increased surface roughness.

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

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

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

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

263 calcite surface in proximity and modify the calcite surface.

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

265 between the functionalized AFM tips and the calcite surfaces were mainly through carboxylate interac

266 on forces were significantly stronger on the calcite surfaces with higher calcium ion exposures.

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

268 phere calcium ions larger than on unconfined calcite surfaces.

269 pared to the calcium ion rich fluids for all calcite surfaces.

270 xylate interactions with the calcium ions on calcite surfaces.

271 ess chambers, often filled with soft, chalky calcite, that are irregularly scattered throughout the s

272 h the as-deposited vaterites and the evolved calcite, the perturbed shell contains two sets of carbon

273 of a ubiquitous structural motif in biogenic calcite, their nanoscopic intracrystalline defects.

274 Combined with the general paucity of relict calcite, these extremely low values demonstrate highly e

275 not only suppress the soft yielding of pure calcite through the classical precipitation strengthenin

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 onally qualitative abiotic proxy, glendonite calcite, to generate quantitative temperature estimates

280 greater than those in biogenic and synthetic calcite traditionally considered to approach oxygen-isot

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

282 large Asp-free domains drive the vaterite to calcite transformation-which are retarded by the occlusi

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

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

285 ected specimens found that in addition to Mg-calcite up to 30% aragonite were present in the skeleton

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

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

290 Over 48 h, calcite was preferentially dissolved, forming an altered

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

292 nterface structure is similar whether or not calcite was previously exposed to an aqueous brine, and

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

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

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

296 Here we show that the interaction of calcite with acidic materials in the stratosphere result

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 ly probe the interface of calcium carbonate (calcite) with natural petroleum oil, synthetic petroleum