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Phase transitions in biogenic amorph...

Gong, Yutao.

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Phase transitions in biogenic amorphous calcium carbonate.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Phase transitions in biogenic amorphous calcium carbonate./
作者:	Gong, Yutao.
面頁冊數:	104 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
Contained By:	Dissertation Abstracts International74-11B(E).
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3588371
ISBN:	9781303264047

Phase transitions in biogenic amorphous calcium carbonate.
Gong, Yutao.

Phase transitions in biogenic amorphous calcium carbonate. - 104 p.

Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2013.

Geological calcium carbonate exists in both crystalline phases and amorphous phases. Compared with crystalline calcium carbonate, such as calcite, aragonite and vaterite, the amorphous calcium carbonate (ACC) is unstable.

ISBN: 9781303264047Subjects--Topical Terms:

516296
Physics.

Phase transitions in biogenic amorphous calcium carbonate.
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245 1 0 $a Phase transitions in biogenic amorphous calcium carbonate.
300 $a 104 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
500 $a Adviser: Pupa Gilbert.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2013.
520 $a Geological calcium carbonate exists in both crystalline phases and amorphous phases. Compared with crystalline calcium carbonate, such as calcite, aragonite and vaterite, the amorphous calcium carbonate (ACC) is unstable.
520 $a Unlike geological calcium carbonate crystals, crystalline sea urchin spicules (99.9 wt % calcium carbonate and 0.1 wt % proteins) do not present facets. To explain this property, crystal formation via amorphous precursors was proposed in theory. And previous research reported experimental evidence of ACC on the surface of forming sea urchin spicules.
520 $a By using X-ray absorption near-edge structure (XANES) spectroscopy and photoelectron emission microscopy (PEEM), we studied cross-sections of fresh sea urchin spicules at different stages (36h, 48h and 72h after fertilization) and observed the transition sequence of three mineral phases: hydrated ACC → dehydrated ACC → biogenic calcite. In addition, we unexpectedly found hydrated ACC nanoparticles that are surrounded by biogenic calcite. This observation indicates the dehydration from hydrated ACC to dehydrated ACC is inhibited, resulting in stabilization of hydrated ACC nanoparticles.
520 $a We thought that the dehydration was inhibited by protein matrix components occluded within the biomineral, and we designed an in vitro assay to test the hypothesis. By utilizing XANES-PEEM, we found that SM50, the most abundant occluded matrix protein in sea urchin spicules, has the function to stabilize hydrated ACC in vitro.
590 $a School code: 0262.
650 4 $a Physics. $3 516296
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650 4 $a Condensed matter physics. $3 3173567
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710 2 $a The University of Wisconsin - Madison. $b Physics. $3 2094813
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