نتایج جستجو برای: calcitic hypocoatings
تعداد نتایج: 223 فیلتر نتایج به سال:
Biologically formed calcite crystals have unique, sculptured shapes that are believed to be regulated locally by speci"c macromolecules and by directional #ux of ions into the microenvironment of crystal growth. This paper describes a biologically inspired synthesis of patterned calcitic "lms using micropatterned self-assembled monolayers (SAMs) which served as spatially constrained microenviro...
isotope data from bulk carbonates, micrite, marine calcite cements, non-skeletal grains and brachiopods indicate deposition of a wide spectrum of warm to cold water carbonates during the ordovician and the jurassic. this isotopic interpretation is supported by warm to cold climatic models proposed for the ordovician and the jurassic. these carbonates formed during the greenhouse mode (condition...
This study illustrates the contribution of plant and faecal microfossil records to interdisciplinary approaches on identification, composition, taphonomy seasonality livestock dung materials. The focus is opal phytoliths calcitic spherulites embedded within modern pellets collected from pasture grounds pens a range animals, including cattle, sheep pigs three different farms seasons year in Meno...
Coccoliths are calcitic particles produced inside the cells of unicellular marine algae known as coccolithophores. They are abundant components of sea-floor carbonates, and the stoichiometry of calcium to other elements in fossil coccoliths is widely used to infer past environmental conditions. Here we study cryo-preserved cells of the dominant coccolithophore Emiliania huxleyi using state-of-t...
Chicken eggshell is the protective barrier of the egg. It is a biomineral composed of 95% calcium carbonate on calcitic form and 3.5% organic matrix proteins. Mineralization process occurs in uterus into the uterine fluid. This acellular fluid contains ions and organic matrix proteins precursors which are interacting with the mineral phase and control crystal growth, eggshell structure and mech...
AB STRACT: Glauconite and Ca phosphate peloids occur in Jurassic and Cretaceous bioclastic carbonate rocks from pelagic swell sequences of the Algayat-Crevillente Unit (Subbetic Zone). The size and morphology of the peloids are controlled by the bioclasts. The glauconite in both stratigraphic positions is K rich (>0.69 atoms p.f.u.) and shows well-defined 10 AÊ lattice fringes. Poorly crystalli...
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