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12 results for “chemical precipitation”
Chemical Effects Induced by Relativistic Precipitating Electrons
<p>Figures, data, and code used in my paper describing "Chemical Effects Induced by Relativistic Precipitating Electrons"</p>
Data from: Composition of a chemical signalling trait varies with phylogeny and precipitation across an Australian lizard radiation
<p>The environment presents challenges to the transmission and detection of animal signalling systems, resulting in selective pressures that can drive signal divergence among populations in disparate environments. For chemical signals, climate is a potentially important selective force because factors such as temperature and moisture influence the persistence and detection of chemicals. We investigated an Australian lizard radiation (<em>Heteronotia</em>) to explore relationships between a sexually dimorphic chemical signalling trait (epidermal pore secretions) and two key climate variables: temperature and precipitation. We reconstructed the phylogeny of <em>Heteronotia</em> with exon capture phylogenomics, estimated phylogenetic signal in among-lineage chemical variation, and assessed how chemical composition relates to temperature and precipitation using multivariate phylogenetic regressions. High estimates of phylogenetic signal indicate that the composition of epidermal pore secretions varies among lineages in a manner consistent with Brownian motion; although there are deviations to this, with stark divergences coinciding with two phylogenetic splits. Accounting for phylogenetic non-independence, we found that among-lineage chemical variation is associated with geographic variation in precipitation but not temperature. This contrasts somewhat with previous lizard studies, which have generally found an association between temperature and chemical composition. Our results suggest that geographic variation in precipitation can affect the evolution of chemical signalling traits, possibly influencing patterns of divergence among lineages and species.</p> <p> </p>
Sustainable recovery of critical elements from seawater saltworks bitterns by integration of high selective sorbents and reactive precipitation and crystallisation: Developing the probe of concept with on-site produced chemicals and energy
<p>The availability of raw mineral resources containing elements included in the Critical Raw Materials (CRMs) list is a growing concern for the European Union. Sea mining has been identified as a promising secondary source. In particular, brines obtained in solar saltworks (bitterns) contain relevant amounts of valuable CRMs such as Mg(II), B(III), other alkaline/alkaline earth metals (Rb(I), Cs(I), Sr(II)) and transition/post-transition elements (Co(II), Ga(III), Ge(IV)). However, the low concentration of some of these elements (µg/L) requires an effort to develop recovery routes that are sustainable and economically feasible where the required chemicals and energy are produced on-site from the saltworks bitterns (i.e. HCl and NaOH). Even the conventional recovery processes such as ion exchange, sorption and precipitation, which have proved to be competitive for metals recovery, are challenged in the case of Trace Elements (TEs). This work studies the recovery of TEs included in the CRMs list from saltworks bitterns after ion exchange processes. First, batch crystallisation and reactive precipitation were tested for some target elements in single-component solutions: Sr(II), Co(II), Ga(III), Ge(IV) and B(III). Then, the experiments were carried out with multi-component synthetic solutions assuming different scenarios of bittern streams coming out a selective extraction stage using sorption and ion exchange processes. The targeted elements were recovered except for Ge(IV), where alternative routes need to be evaluated, as its precipitation involves the use of tannic acid or sulphide solutions that could not be produced from the bitterns. However, a further concentration step would be necessary to achieve element concentrations closer to the mineral phases saturation. Moreover, model simulations were performed using the PHREEQC program, which provided a good prediction of the experimental trends obtained in most cases.</p>
Data from: Composition of a chemical signalling trait varies with phylogeny and precipitation across an Australian lizard radiation
Open the record for dataset details and reuse information.
Chemical composition of precipitation at the Virginia Coast Reserve 1990-2015
This data set characterizes the chemical composition of precipitation sampled weekly on the Virginia eastern shore in collaboration with the VCR LTER. The early portion of the record corresponds to precipitation sampled adjactent to the meteorological station on Hog Island. The latter portion of the record corresponds to precipitation sampled at the GATR site on the Eastern Shore Wildlife Refuge. Samples were analyzed at the University of Virginia using procedures similar to those employed by the Global Precipitation Chemistry Project (GPCP), Western Atlantic Ocean Experiment (WATOX), and the Atmosphere Ocean Chemistry Experiment (AEROCE). Following extensive damage to the collection system by Hurricane Isabel in Sept. 2003, the unit was moved to the property of the Anheuser Busch Coastal Research Center in Oyster, VA. Data collection was terminated on 12/30/2015.
Phosphorus recovery from liquid digestate by chemical precipitation using low-cost ion sources
<p>BACKGROUND</p> <p>Phosphorus (P) recovered and recycled from agricultural waste, such precipitation of struvite (MgNH<sub>4</sub>PO<sub>4</sub>.6H<sub>2</sub>O) and calcium phosphates from the effluent after anaerobic digestion of wastes, is an important approach to developing environmentally sustainable fertilizers. However, for controlled phosphorus precipitation/recovery, it is usually necessary to supplement Ca<sup>2+</sup> or Mg<sup>2+</sup> ions; this represents more than 75% of the total operational costs and, as a result, hinders a more extensive application of this process. Therefore, there is a need to investigate alternative and low-cost cation sources to recover phosphorus by precipitation. This study investigated limestone powder as calcium source and seawater as a magnesium source for phosphorus recovery by precipitation from the liquid fraction of digestate. The main parameters affecting the efficiency of the precipitation process were assessed under (i) four different pH values and (ii) three different molar ratios (Ca or Mg: P).</p> <p>RESULTS</p> <p>The maximum phosphate removal rate was 44% for limestone powder at molar ratio 2:1 and pH 7. Higher phosphate removal using limestone powder was possibly inhibited by calcite precipitation. For seawater, the phosphate removal rate was 65% at molar ratio 2:1 and pH 10. Results of experiments using seawater at molar ratio 2:1 showed a decrease in K<sup>+</sup> concentration and phosphate, suggesting that K-struvite precipitation may have occurred.</p> <p>CONCLUSION</p> <p>Limestone powder and seawater have a great potential to be used partially or totally as ion source for industrial recovery of P, mainly due to its very low cost. The recovered product could potentially be used as soil amendment and/or as phosphate rock substitute for fertilizer production. © 2021 Society of Chemical Industry (SCI).</p>
Data for Millennial-scale precipitation and chemical weathering variations since the last deglaciation recorded by the northwestern South China Sea sediments
<p>Magnetic, DRS and Geochemical data sets of core SCS-02</p>
Genome-wide profiling and identification of disordered transcription factors through chemical precipitation mapping [RNA-Seq]
GEO Series GSE190962. Homo sapiens. 6 samples. Type: Expression profiling by high throughput sequencing.
Genome-wide profiling and identification of disordered transcription factors through chemical precipitation mapping
GEO Series GSE190963. Homo sapiens. 84 samples. Type: Genome binding/occupancy profiling by high throughput sequencing; Expression profiling by high throughput sequencing.
Genome-wide profiling and identification of disordered transcription factors through chemical precipitation mapping [DisP-Seq]
GEO Series GSE190961. Homo sapiens. 46 samples. Type: Genome binding/occupancy profiling by high throughput sequencing.
Genome-wide profiling and identification of disordered transcription factors through chemical precipitation mapping [ATAC-seq]
GEO Series GSE190959. Homo sapiens. 9 samples. Type: Genome binding/occupancy profiling by high throughput sequencing.
Genome-wide profiling and identification of disordered transcription factors through chemical precipitation mapping [ChIP-seq]
GEO Series GSE190960. Homo sapiens. 29 samples. Type: Genome binding/occupancy profiling by high throughput sequencing.
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