ライフサイエンスコーパス: aragonite

1 do not favor the inorganic precipitation of aragonite.

2 her, close to those measured for calcite and aragonite.

3 of Sr/Ca ratios revealed the particles to be aragonite.

4 lline polymorphs of CaCO(3), calcite, and/or aragonite.

5 activation was followed by precipitation of aragonite.

6 required for supersaturation with respect to aragonite.

7 comprised of the most dense CaCO3 polymorph, aragonite.

8 create a framework for the precipitation of aragonite.

9 the lenses of which are made of birefringent aragonite.

10 rm, and with time crystallizes to calcite or aragonite.

11 than the crystalline polymorphs vaterite or aragonite.

12 are confirmed by electron diffraction to be aragonite.

13 sing phase stability, are: 20% calcite, 6% aragonite, 60% high-Mg calcite, and 14% amorphous carb

14 For the case of aragonite, 95% of the spectrophotometric aragonite satur

15 earl oysters and abalone, consists mostly of aragonite (a form of CaCO3), a brittle constituent of re

16 bout 4.05 angstroms in strontium-substituted aragonite and at about 4.21 angstroms in strontianite.

17 the thermodynamically favored calcite (both aragonite and calcite are CaCO(3) polymorphs).

18 hydrated and dehydrated forms of ACC in the aragonite and calcite layers of Mytilus edulis shells cu

19 to intervals when seawater chemistry favored aragonite and calcite precipitation, respectively.

20 The first appearances of aragonite and calcite skeletons in 18 animal clades that

21 tiary through the present (40 to 0 Ma), when aragonite and MgSO4 salts were the dominant marine preci

22 er temperature, salinity, light attenuation, aragonite and oxygen down to 1500 m deep.

23 Nacre, a composite made from biogenic aragonite and proteins, exhibits excellent strength and

24 high-magnesium calcites (HMC) dominates over aragonite (Arag) and low-magnesium calcite (LMC) and con

25 Both delta(13)C and delta(18)O of the aragonite are enriched above the expected kinetic fracti

26 AP7 is an extracellular aragonite-associated protein of the nacre layer of the m

27 Interestingly, 95% of the aragonite-associated protein sequences were found to con

28 Of 39 mollusk aragonite-associated protein sequences, 100% contain at

29 Collectively, our findings indicate that aragonite-associated proteins have evolved signature seq

30 y system that includes hundreds of eyes with aragonite-based lenses.

31 in-protein assembly processes and ultimately aragonite biosynthesis.

32 their guts ("low" and "high" Mg-calcite and aragonite), but that very fine-grained (mostly < 2 mum)

33 inal step consists of partial replacement of aragonite by dolomite, possibly in neutral to slightly a

34 hells, is a biomineral lamellar composite of aragonite (CaCO3) and organic sheets.

35 using ocean acidification, lowering seawater aragonite (CaCO3) saturation state (Omega arag), with po

36 ous for hours, and finally, crystallize into aragonite (CaCO3).

37 The ratio of aragonite/calcite at WOL and delta(18)O at SL suggest th

38 (4) abundance was negatively correlated with aragonite/calcite, suggesting that severe moisture defic

39 ome mollusk shells, has alternating biogenic aragonite (calcium carbonate, CaCO(3)) tablet layers and

40 were also found to possess primarily normal, aragonite-containing otoliths, while hatchery-reared juv

41 We report aragonite crystallization in primary cell cultures of a

42 on "toolkit," an organic scaffold upon which aragonite crystals can be deposited in specific orientat

43 e, skeletal proteins are embedded within the aragonite crystals in a highly ordered arrangement consi

44 ing lateral growth of colonies and growth of aragonite crystals under the calcifying tissue.

45 cess leads to the formation of extracellular aragonite crystals.

46 sformation of amorphous calcium carbonate to aragonite, demonstrating the co-existence of both amorph

47 by stabilizing magnesium calcite to inhibit aragonite deposition, PfN44 participated in P. fucata sh

48 and stabilized magnesium calcite to inhibit aragonite deposition.

49 We show that otoliths (aragonite ear bones) of young fish grown under high CO2

50 mposition to depth changes in the calculated aragonite equilibrium oxygen isotope values implies shal

51 aters to remain over the saturation level of aragonite for long periods of time.

52 d this correlates with known aggregation and aragonite formation functions in three experimentally te

53 dic matrix protein named PfN44 that affected aragonite formation in the shell of the pearl oyster Pin

54 he early reaction stages taking place during aragonite formation were identified in a highly supersat

55 ins and polysaccharides were shown to induce aragonite formation, rather than the thermodynamically f

56 ive to control scenarios and does not induce aragonite formation.

57 ystyrene spheres along with calcite, whereas aragonite forms in solution via homogeneous nucleation.

58 t prehistoric processing methods in skeletal aragonite from archaeological shell midden assemblages.

59 es are consistent with a transition to (001) aragonite growth on a (1014) calcite surface.

60 tely biogenic anhydrous ACC --> vaterite --> aragonite --> calcite.

61 ipitate calcium carbonate extracellularly as aragonite in a calcifying medium between the calicoblast

62 demonstrate that in vitro crystallization of aragonite in coral cell cultures is possible, and provid

63 report stable oxygen isotope measurements of aragonite in fish otoliths--ear stones--collected across

64 leation barrier surpasses that of metastable aragonite in solutions with Mg:Ca ratios consistent with

65 (2+) stoichiometrically but also precipitate aragonite in vitro in seawater at pH 8.2 and 7.6, via an

66 ular assemblies that nucleate single-crystal aragonite in vitro.

67 This stabilization of aragonite is remarkable in that it occurred in the prese

68 Aragonite is the dominant CaCO3 mineral present in the l

69 text]300 nm) of nacre's building blocks, the aragonite lamellae (or platelets), and (ii) the imbricat

70 ples that Sr randomly replaces Ca within the aragonite lattice.

71 chiton Acanthopleura granulata has the first aragonite lenses ever discovered.

72 investigated the crack behavior in geologic aragonite mineral (pure monocrystal) and found that the

73 The formation of aragonite mineral in the mollusk shell or pearl nacre re

74 their exposure to waters undersaturated for aragonite more likely in the near future given that thes

75 ous and crystalline material within the same aragonite needle.

76 he saturation state of the carbonate mineral aragonite of surface waters.

77 y ranged from 2299 to 2346 mumol kg(-1), and aragonite Omega ranged from 1.35 to 2.44.

78 known to cause the nucleation and growth of aragonite on calcite seed crystals in supersaturated sol

79 mation in sea urchin spicules, and not proto-aragonite or poorly crystalline aragonite (pAra), as exp

80 oxygen and strontium isotope ratios of four aragonite otoliths collected from the Fox Hills Formatio

81 nd not proto-aragonite or poorly crystalline aragonite (pAra), as expected for aragonitic nacre.

82 Second, aragonite patches nucleate in close proximity to sulfate

83 blet sliding primarily resisted by nanoscale aragonite pillars from the following sliding resisted by

84 propagating crack, surprisingly, invades the aragonite platelet following a zigzag crack propagation

85 re, which tunes crack propagation inside the aragonite platelet in an intergranular manner.

86 ghening origin of previously-thought brittle aragonite platelet is ascribed to its unique nanoparticl

87 trast with the intergranular cracking in the aragonite platelet of nacre.

88 It has been widely thought that the ceramic aragonite platelets in nacre invariably remain shielded

89 ction along the biopolymer interface between aragonite platelets.

90 ium carbonate precipitates as the metastable aragonite polymorph in marine environments, rather than

91 he reef and deposit calcium carbonate as the aragonite polymorph, stabilized into a continuous calcar

92 sensitivity equivalent to that of laboratory aragonite precipitated at equilibrium and the nighttime

93 te in the tropics by 30 percent and biogenic aragonite precipitation by 14 to 30 percent.

94 solates, delayed ALP activation, and delayed aragonite precipitation.

95 proach to resolve the long-standing "calcite-aragonite problem"--the observation that calcium carbona

96 Early-stage reaction mechanisms for aragonite-promoting systems are relatively unknown compa

97 vitro is highly challenging, because Mg-free aragonite, rather than calcite, is the favored product i

98 rm deposits are produced through admixing of aragonite-rich sediments, which have relatively positive

99 pacts and projected ocean thermal stress and aragonite saturation (a proxy for ocean acidification).

100 ificantly along a natural gradient in pH and aragonite saturation (Omegaarag).

101 Northeast Pacific, combined with the shallow aragonite saturation horizon (ASH) and high carbonate di

102 am per year, are observed beginning near the aragonite saturation horizon.

103 hree stressors: high human impact, declining aragonite saturation levels and elevated thermal stress.

104 dification could result in reductions of the aragonite saturation levels during future decades, actin

105 e project absolute and percentage changes in aragonite saturation state (Omegaarag) for the period be

106 We also show that corals can achieve a high aragonite saturation state (Omegaarag) in the calcifying

107 or Seamount Chain at depths of 535-732 m and aragonite saturation state (Omegaarag) values of 0.71-1.

108 ntration of carbon dioxide will decrease the aragonite saturation state in the tropics by 30 percent

109 ion has already been observed in areas where aragonite saturation state is ~1.

110 , bottom temperature, bottom oxygen, pH, and aragonite saturation state through model hindcasts, refo

111 cation rates of corals because of decreasing aragonite saturation states (Omega(arag)).

112 of aragonite, 95% of the spectrophotometric aragonite saturation states (Omega(Aspec)) were within +

113 lcification fluid [CO3(2-)] and induces high aragonite saturation states, favourable to the precipita

114 etric [CO3(2-)] methodology and to determine aragonite saturation states.

115 esents [CO3(2-)] slightly above the level of aragonite saturation, and the expected anthropogenic aci

116 h in situ [CO3(2-)] compared to the expected aragonite saturation.

117 ense research interest due to their external aragonite shell and vulnerability to ocean acidification

118 We measured the Delta47 of aragonite shells of the freshwater gastropod Viviparus l

119 Corallimorpharians escaped extinction from aragonite skeletal dissolution, but some modern stony co

120 of oceanic CO(2), which would have impacted aragonite solubility.

121 We show in both coral and synthetic aragonite spherulites that crystal growth by attachment

122 nce of AP7 alone and did not require typical aragonite stabilization agents such as Mg(II), other nac

123 ome strontium substitutes for calcium in the aragonite structure, at concentrations of about 7500 par

124 roscopy experiments revealing that stacks of aragonite tablet crystals in nacre are misoriented with

125 mposite biomineral that contains crystalline aragonite tablets confined by organic layers.

126 mineral content of about 99% (by volume) of aragonite, the shell of Strombus gigas can thus be consi

127 os consistent with modern seawater, allowing aragonite to dominate the kinetics of nucleation.

128 water that is undersaturated with respect to aragonite upwelling onto large portions of the continent

129 trikingly similar to natural nacre: lamellar aragonite with interspersed N16N layers.

130 onate minerals consist mainly of calcite and aragonite, with minor ankerite and dolomite.

131 This supports non-classical formation of aragonite within both a synthetic and biological context