Results 91 to 100 of about 4,430 (207)

Microbial Communities and Associated Mineral Fabrics in Altamira Cave, Spain [PDF]

International Journal of Speleology, 2009
Evidences of microbial colonizations were observed in Altamira Cave, Spain. These consisted of distinct small coloured colonies, bothon walls and ceiling, mainly located in the area near the cave entrance, which progressed until reaching the Polychromes ...
Cuezva Soledad, Sanchez-Moral Sergio, Saiz-Jimenez Cesareo, Canaveras Juan Carlos   +3 more
doaj  

Efficiently Stabilized Spherical Vaterite CaCO₃ Crystals by Carbon Nanotubes in Biomimetic Mineralization

, 2016
Carbon nanotubes were used to induce the formation of spherical vaterite crystals and stabilize the metastable crystals in the biomimetic mineralization of CaCO3 for the first time.
Chao Gao (154531), Wenwen Li (735004)
core   +2 more sources

Improving the productivity and purity of vaterite produced via a refined bubbling method

, 2017
The bubbling method has been refined to produce vaterite with both high productivity and purity for its promising applications. This involves: a) adding an adequate amount of ammonia water to achieve maximum precipitation of Ca2+, b) refining CO2 bubble ...
Ying Xu, Zhaowu Shen, Peiyuan Chen, Honghao Ma   +3 more
core   +1 more source

Thermodynamic aspects of the vaterite-calcite phase transition

, 2000
Although vaterite is the least stable anhydrous calcium carbonate polymorph, it is formed as a metastable phase in some normal and pathological biomineralisation processes. In this work, thermodynamic aspects of the vaterite-calcite phase transition were
Schmidt, H. G., Königsberger, L.C., Gamsjäger, H., Königsberger, E., Wolf, G.   +4 more
core  

Carbonate orientational order and superlattice structure in vaterite

, 2014
© 2014 Elsevier B.V. All rights reserved. Vaterite is considered to play an important role as a precursor phase in the formation of calcium carbonate phases, including those related to biomineralization. An accurate description of vaterite\u27s structure
Zhang, Jiaming, Becker, Udo, Cai, Zhonghou, Wang, Jianwei, Zhang, Fuxiang, Ewing, Rodney C.   +5 more
core   +1 more source

Dopamine-Induced Mineralization of Calcium Carbonate Vaterite Microspheres

, 2016
Two biogenic materials from mussels are attracting attention from scientists: calcium carbonate (CaCO3), the most widely studied biomineral that composes the shell, or nacre, of mussels, and dopamine, a small catechol-containing biomimetic molecule of ...
Chan Beum Park (1579897), Sungjin Kim (106517)   +1 more
core   +1 more source

Growth evolution in calcium carbonate microparticles involving mixed vaterite-aragonite structures

Physical Review Research
Calcium carbonate (CaCO_{3}) is a widely occurring mineral that is crucial to many natural and synthetic processes. CaCO_{3} crystallizes in three anhydrous polymorphs and often serves as a model system to study nucleation and growth phenomena.
Daniyal Younas, Elizaveta Sidler, Chayene G. Anchieta, Seniz Ucar, Per Erik Vullum, Ragnvald H. Mathiesen, Federico Zontone, Raffaela Cabriolu, Yuriy Chushkin, Dag Werner Breiby, Basab Chattopadhyay   +10 more
doaj   +1 more source

A re-examination of reported lacustrine vaterite formation in Holkham Lake, Norfolk, UK

, 1996
Holkham Lake in North Norfolk has become world renowned as the only known site where vaterite, a very rare polymorph of calcium carbonate, forms in natural waters.
Andrews, Julian E., Lucas, David
core   +1 more source

L‐Aspartic Acid with Dual Functions: An Eco‐Friendly and Affordable Choice to Accelerate High Salinity Brine Utilization

Advanced Science
L‐Aspartic acid (L‐Asp) poses a dual function, which can affect the evaporation and crystallization process of the high‐salinity brine by altering the physical or chemical properties of the salts. MSWI (municipal solid waste incineration) fly ash washing
Suning Mao, Zhen Yu, Jie Chen, Yizhe Shen, Minjie Li, Chen Sun, Xiaoqing Lin, Bin Yang, Tong Chen, Qunxing Huang, Xiaodong Li, Jianhua Yan   +11 more
doaj   +1 more source

Examining the impacts of elevated, variable pCO2 on larval Pacific razor clams (Siliqua patula) in Alaska

Frontiers in Marine Science
An increase in anthropogenic carbon dioxide is driving oceanic chemical shifts resulting in a long-term global decrease in ocean pH, colloquially termed ocean acidification (OA).
Marina W. Alcantar, Jeff Hetrick, Jacqueline Ramsay, Amanda L. Kelley   +3 more
doaj   +1 more source