Foraminifera are unicellular organisms that inhabit the oceans in various ecosystems. The majority of the foraminifera precipitate calcitic shells and are among the major CaCO(3) producers in the oceans. They comprise an important component of the global carbon cycle and also provide valuable paleoceanographic information based on the relative abundance of stable isotopes and trace elements (pr...

A cDNA expression library constructed from mantle tissue mRNA of the Mediterranean fan mussel Pinna nobilis was screened with antibodies raised against the acetic acid-soluble shell matrix of the same species. This resulted in the isolation of a 2138-base pair cDNA, containing 13 tandem repeats of 93 base pairs. The deduced protein has a molecular mass of 66.7 kDa and a isoelectric point of 4.8...

The steel production enhancement in recent decades has increased the solid waste generation plants. Due to increase environmental policies stringency, efforts have been made give them a more appropriate destination. In this context, internal reuse of these materials is solution often applied by industry reduce costs and decrease slag generation. Therefore, aim research replace calcitic lime lim...

Coccolithophores are a group of unicellular marine algae that shape global geochemical cycles via the production calcium carbonate crystals. Interestingly, different life-cycle phases same coccolithophore species produce very calcitic scales, called coccoliths. In widely studied diploid phase, crystals have anisotropic and complex morphologies, while haploid cells coccoliths consisting solely c...

Calcite cave pool precipitates often display a variety of potential biosignatures from the macroscopic to the submicroscopic. A fossil cave pool in Cottonwood Cave, New Mexico, exhibits older stalactites and stalagmites that are completely coated in brown, laminated calcitic crust that extends down as pool fingers and u-loops. The pool fingers and u-loops are mainly micrite to clotted micrite, ...

A study was conducted to determine the effect of different limestone particle sizes in layer diets on bone quality characteristics at end-of-lay hens. Calcitic limestone (360 g Ca/kg DM) that is extensively used in commercial poultry diets was obtained from a specific South African source. Limestone particles were graded as small (<1.0 mm), medium (1.0 2.0 mm) and large (2.0 3.8 mm) and include...

Determining the manganese concentration in shells of freshwater bivalves provides a unique way to obtain information about climate and environmental changes during time-intervals that pre-date instrumental data records. This approach, however, relies on a thorough understanding of how manganese is incorporated into the shell material -a point that remained controversial so far. Here we clarify ...

Soil organic matter (OM) is a source of fertility for food provisioning and means climate mitigation. A high pedodiversity observed over very short distances due to both past present land use, such as in Western Africa (Northern Togo), makes this crucial issue. In particular, some small spots covered by sacred forests (forêts sacrées) cultural value area are extremely biodiverse, calcareous OM ...

Abstract In the present study, 5 different consolidants were tested on marble varieties preliminarily subjected to artificial weathering, evaluate their consolidating effectiveness and thermal behavior after consolidation, in terms of residual strain heating–cooling cycles dry wet condition tendency bowing. Treatments based ethyl silicate, with without a coupling agent improve performance calci...