School of Natural Sciences: Recent submissions
Now showing items 441-460 of 1110
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Biomineralisation by earthworms - an investigation into the stability and distribution of amorphous calcium carbonate
(2015)BACKGROUND: Many biominerals form from amorphous calcium carbonate (ACC), but this phase is highly unstable when synthesised in its pure form inorganically. Several species of earthworm secrete calcium carbonate granules ... -
Neutron and X-ray diffraction and empirical potential structure refinement modelling of magnesium stabilised amorphous calcium carbonate
(2014)Amorphous calcium carbonate (ACC) plays a key role in biomineralisation processes in sea organisms. Neutron and X-ray diffraction have been performed for a sample of magnesium-stabilised ACC, which was prepared with a Mg:Ca ... -
The effect of aspartic acid and glycine on amorphous calcium carbonate (ACC) structure, stability and crystallization
(Elsevier, 2014)The effect of organic molecules on CaCO3 crystallization, in particular on the formation of the initial amorphous calcium carbonate (ACC) phase, is poorly understood despite this knowledge being crucial for designing ... -
The effect of heating on the morphology of crystalline neodymium hydroxycarbonate, NdCO3OH
(2014)The crystallization of hexagonal NdCO3OH through hydrothermal synthesis carried out at slow (reaching the desired temperature within 100 min) and quick (50 min) rates of heating but at variable temperatures (165–220ºC) are ... -
The role of REE3+ in the crystallization of lanthanites
(2014)The formation of crystalline rare earth element (REE) (e.g. La, Ce, Pr, Nd) carbonates from aqueous solutions was examined at ambient temperature using UV-Vis spectrophotometry, combined with X-ray diffraction, high-resolution ... -
Amorphous dysprosium carbonate: characterization, stability, and crystallization pathways
(2013)The crystallization of amorphous dysprosium carbonate (ADC) has been studied in air (21–750 °C) and in solution (21–250 °C). This poorly ordered precursor, Dy2(CO3)3·4H2O, was synthesized in solution at ambient temperature. ... -
Structural properties and transformations of precipitated FeS
(2012)Nanocrystalline iron sulfides form in diverse anoxic environments. The initial precipitate is commonly referred to as nanocrystalline mackinawite (FeS) or amorphous FeS. In order to better understand the structure of the ... -
A comparison of helminth infections as assessed through coprological analysis and adult worm burdens in a wild host
(2018)Coprological analysis is the most widely used diagnostic tool for helminth infection in both domestic and wild mammals. Evaluation of the efficacy of this technique is rare, due to the lack of availability of adult worm ... -
Formation of calcium sulfate through the aggregation of sub-3 nanometre primary species
(2016)The formation pathways of gypsum remain uncertain. Here, using truly in situ and fast time-resolved small-angle X-ray scattering, we quantify the four-stage solution-based nucleation and growth of gypsum (CaSO4·2H2O), an ... -
Inhibition of Calcite Growth: Combined Effects of Mg2+ and SO42–
(2016)Magnesium and sulfate are each known to affect calcite growth and dissolution, but little is known about their combined effects on calcite growth rates. We grew calcite using the constant composition approach at ambient ... -
Is bicarbonate stable in and on the calcite surface?
(2016)We have used density functional theory with the COSMO-RS implicit solvent model to predict the pKa for the deprotonation of bicarbonate to carbonate, i.e. HCO3− <=> CO32− + H+, when HCO3− is included in, and adsorbed on, ... -
An experimental study of hydroxylbastnasite solubility in aqueous solutions at 25 °C
(2016)The mobility of rare earth elements (REEs) in natural aqueous solutions is of increasing interest due to their application in numerous high-tech and renewable energy technologies (e.g., wind turbines and electric vehicles), ... -
ACC and vaterite as metastable intermediates in the solution based crystallization of CaCO3
(Springer International Publishing, 2017)Amorphous calcium carbonate (ACC) and vaterite are not very common in abiotic systems, but they play a very significant role in biomineralization processes and are key in the global carbon cycle. Despite their importance, ... -
Physicochemical and Additive Controls on the Multistep Precipitation Pathway of Gypsum
(MDPI, 2017)Synchrotron-based small- and wide-angle X-ray scattering (SAXS/WAXS) was used to examine in situ the precipitation of gypsum (CaSO4·2H2O) from solution. We determined the role of (I) supersaturation, (II) temperature and ... -
Organic synthesis on Mars by electrochemical reduction of CO2
(American Association for the Advancement of Science, 2018)The sources and nature of organic carbon on Mars have been a subject of intense research. Steele et al. (2012) showed that 10 martian meteorites contain macromolecular carbon phases contained within pyroxene- and olivine-hosted ... -
Systematics of the Thai Hypericaceae Juss. and Kielmeyeroideae (Clusiaceae Lindl.)
(Trinity College (Dublin, Ireland). Department of Botany, 2009)The Clusiaceae (Subfamily Kielmeyeroideae) and Hypericaceae families are fully revised for Thailand. 33 species are recognised in six genera, these are; Calophyllum Linnaeus, Kayea Wallich, Mammea Linnaeus and Mesua Linnaeus ... -
Salinity-Dependent Adhesion Response Properties of Aluminosilicate (K-Feldspar) Surfaces
(2017)Flooding sandstone oil reservoirs with low salinity water can lead to a significant increase in oil recovery, a phenomenon called “the low salinity effect”. Although there are many factors that contribute to this response, ... -
Delimitation and diversity of the genus Badula Juss. (primulaceae) - rare endemic trees of the Mascarene Archipelago
(Trinity College (Dublin, Ireland). Department of Botany, 2010)The western Indian Ocean Mascarene archipelago is a trio of geologically young volcanic islands that have never been connected to a continent or continental fragments. The islands are biologically diverse, and 72% of the ... -
Reaction pathways and textural aspects of the replacement of anhydrite by calcite at 25 °C
(2017)The replacement of sulfate minerals by calcium carbonate polymorphs (carbonation) has important implications in various geological processes occurring in Earth surface environments. In this paper we report the results of ... -
Understanding the Lived Experiences of Gender Minority Students in Irish Third-Level Education
(Trinity College Dublin, 2019)This report provides the main analytical results of a survey distributed to gender minority students (i.e. transgender, non-binary, and gender non-conforming) in Irish higher education (Third-Level). The survey touched ...
