Oxygen Spectroscopy and Polarization-Dependent Imaging Contrast (PIC)-Mapping of Calcium Carbonate Minerals and Biominerals

2014 ◽  
Vol 118 (28) ◽  
pp. 8449-8457 ◽  
Author(s):  
Ross T. DeVol ◽  
Rebecca A. Metzler ◽  
Lee Kabalah-Amitai ◽  
Boaz Pokroy ◽  
Yael Politi ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Carbonate Minerals

scholarly journals Adsorption of RNA on mineral surfaces and mineral precipitates

2017 ◽  
Vol 13 ◽  
pp. 393-404 ◽  
Author(s):  
Elisa Biondi ◽  
Yoshihiro Furukawa ◽  
Jun Kawai ◽  
Steven A Benner
Keyword(s):  
Calcium Carbonate ◽  
Periodic Table ◽  
Alkaline Earth ◽  
Laboratory Experiments ◽  
Mineral Surfaces ◽  
Carbonate Minerals ◽  
Natural Mineral ◽  
Large Molecules ◽  
Polymorphic Forms ◽  
Differential Binding

The prebiotic significance of laboratory experiments that study the interactions between oligomeric RNA and mineral species is difficult to know. Natural exemplars of specific minerals can differ widely depending on their provenance. While laboratory-generated samples of synthetic minerals can have controlled compositions, they are often viewed as "unnatural". Here, we show how trends in the interaction of RNA with natural mineral specimens, synthetic mineral specimens, and co-precipitated pairs of synthetic minerals, can make a persuasive case that the observed interactions reflect the composition of the minerals themselves, rather than their being simply examples of large molecules associating nonspecifically with large surfaces. Using this approach, we have discovered Periodic Table trends in the binding of oligomeric RNA to alkaline earth carbonate minerals and alkaline earth sulfate minerals, where those trends are the same when measured in natural and synthetic minerals. They are also validated by comparison of co-precipitated synthetic minerals. We also show differential binding of RNA to polymorphic forms of calcium carbonate, and the stabilization of bound RNA on aragonite. These have relevance to the prebiotic stabilization of RNA, where such carbonate minerals are expected to have been abundant, as they appear to be today on Mars.

Phosphate adsorption on biogenetic calcium carbonate minerals: effect of a crystalline phase

2012 ◽  
Vol 47 (1-3) ◽  
pp. 78-85 ◽  
Author(s):  
Qiang Liu ◽  
Lijing Guo ◽  
Yingmei Zhou ◽  
Yingchun Dai ◽  
Linlin Feng ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Crystalline Phase ◽  
Phosphate Adsorption ◽  
Carbonate Minerals

scholarly journals Meteoric water contribution to sea ice formation and its control of the surface water carbonate cycle on the Wandel Sea shelf, northeastern Greenland

Elem Sci Anth ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Nicolas-Xavier Geilfus ◽  
Kathleen Munson ◽  
Marcos Lemes ◽  
Feiyue Wang ◽  
Jean-Louis Tison ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Surface Water ◽  
Sea Ice ◽  
Water Column ◽  
Inorganic Carbon ◽  
Meteoric Water ◽  
Ice Cover ◽  
Total Alkalinity ◽  
Carbonate Minerals ◽  
Glacial Meltwater

An influx of glacial meltwater has the ability to alter the properties of marine surface waters and their ability to exchange CO2 through changes to water column stratification and the inorganic carbon system. Here, we report how inputs of meteoric water affect the physical and biogeochemical properties of both the water column and the sea ice cover on the Wandel Sea shelf, northeastern Greenland, during spring 2015. The observed depleted δ18O–H2O in the water column, with surface water values as low as –16.3 ‰, suggests a strong input of meteoric water (i.e., water derived from atmospheric precipitation). Depleted δ18O–H2O observed within sea ice (from –21.5 to –8.0 ‰) reflects its formation from surface water that was already depleted isotopically. In addition, a thick snow cover, as present during the study, promotes the formation of snow ice as well as insulates the ice cover. Within sea ice, the resulting relatively warm temperature and low salinity impedes ikaite formation. However, measurements of total dissolved inorganic carbon and total alkalinity indicate that, in both sea ice and the water column, the dissolution of calcium carbonate was the main process affecting the carbonate system. This finding suggests that inputs of glacial meltwater deliver glacier-derived carbonate minerals to the ocean which become incorporated within the ice structure, increasing calcium carbonate dissolution in the water column in the absence of ikaite precipitation within the sea ice. If widespread in glacial-fed waters, bedrock carbonate minerals could increase CO2 sequestration in glacial catchments despite the weakening of the sea ice carbon pump.

scholarly journals Effects of clay minerals on the formation of Mg-bearing calcium carbonate minerals

2021 ◽  
Author(s):  
Zsombor Molnár ◽  
Péter Pekker ◽  
István Dódony ◽  
Mihály Pósfai
Keyword(s):  
Calcium Carbonate ◽  
Clay Minerals ◽  
Carbonate Minerals
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