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82 results for “carboxylates”
Contrasting patterns in biomass allocation, root morphology and mycorrhizal symbiosis for phosphorus acquisition among 20 chickpea genotypes with different amounts of rhizosheath carboxylates
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Scalable Synthesis of Esp and Rhodium(II) Carboxylates from Acetylacetone and RhCl3.xH2O
<p>Primary data for the article with the title above.</p>
Maximum carboxylation rate estimation with chlorophyll content as a proxy of rubisco content
<p>The maximum carboxylation rate (Vcmax) is a key parameter in determining the plant photosynthesis rate per unit leaf area. However, most terrestrial biosphere models currently treat Vcmax as constants changing only with plant functional types, leading to large uncertainties in modelled carbon fluxes. Vcmax is tightly linked with <span>Ribulose-1,5-bisphosphate carboxylase/oxygenase (</span>Rubisco). Here we investigated the relationship between leaf chlorophyll content and Rubisco (Chl-Rub) within a winter wheat paddock. With chlorophyll as a proxy of Rubisco, a semi-mechanistic model was developed to model Vcmax<sub>25.</sub> The Chl-Rub relationship was validated using measurements in a temperate forest in Canada. The results showed that Rubisco was strongly correlated with chlorophyll (R<sup>2</sup> = 0.96, p < 0.001) for winter wheat, due to the absorption of light energy by chlorophyll and the amount of CO<sub>2</sub> catalysed by Rubisco are tightly coupled<span>.</span> Incorporating the Chl-Rub relationship into the semi-mechanistic model, the root mean square error of modelled Vcmax<sub>25</sub> was the lowest among all estimation models. The slopes of Chl-Rub relations were almost identical for the winter wheat and temperate forest, demonstrating the potential for using leaf chlorophyll content as a proxy of leaf Rubisco in modelled Vcmax<sub>25</sub> at large spatial scales. We anticipate that improving Vcmax<sub>25</sub> estimates over time and space will reduce uncertainties in terrestrial biosphere models and improve the estimates of global carbon budgets.</p>
Mapping out the aqueous surface chemistry of metal oxide nanocrystals; carboxylate, phosphonate and catecholate ligands
<p>Data underlying the figures in the publication “Mapping out the aqueous surface chemistry of metal oxide nanocrystals; carboxylate, phosphonate and catecholate ligands”, published in JACS Au.</p> <p> </p> <p>Table of contents:</p> <p>The <em>.pxp</em> documents contain the experimental data of the figures in the manuscript and it can be opened/edited with the software IGOR Pro 8.0 or higher.</p> <p><strong>1. Figure 1.pxp</strong>: Experimental data for <em>Figure 1</em>. (A) Solvothermal synthesis of HfO<sub>2</sub> nanocrystals starting from 1 equivalent Hf(O-tBu)<sub>4</sub> and 80 equivalents benzyl alcohol. (B) <sup>1</sup>H NMR spectra (normal or diffusion filtered) of MEEAA functionalized HfO<sub>2</sub> NCs in different solvents. The α and β resonances belong to the residual hydroxyl and methyl groups of methanol, respectively. (C) Transmission Electron Microscopy (TEM) image of the synthesized HfO<sub>2</sub> NCs. The NC diameter of the quasi-spherical NCs was calculated after measuring the surface area of at least 150 NCs and calculated the diameter as if it was a circle. A size distribution histogram and a zoomed-in image of a singular NC can be seen respectively in the bottom left and the top right corner.</p> <p><strong>2. Figure 2.pxp</strong>: Experimental data for <em>Figure 2</em>. (A) Ligand exchange performed between MEEAA functionalized NCs and PA-PEG. (B) <sup>1</sup>H NMR reference spectra in MeOD of the free ligands as reference and the stepwise titration of MEEAA functionalized NCs with PA-PEG, equivalents are with respect to the total amount of MEEAA present. (C) <sup>31</sup>P NMR spectra (4096 scans) in MeOD for the stepwise titration of MEEAA functionalized NCs with PA-PEG, broadened signals are indicative of NC binding. (D) Diffusion filtered <sup>1</sup>H NMR spectra of MEEAA functionalized NCs in MeOD after addition of 1.3 equivalents of PA-PEG. Signals arising from bound MEEAA are denoted in red, signals arising from PA-PEG are denoted in striped blue. CNC = 1210 µmol.L<sup>-1</sup>, corresponding to 34 mg NCs of this size in 0.5 ml MeOD. Resonances denoted as * are unidentified impurities.</p> <p><strong>3. Figure 3.pxp</strong>: Experimental data for <em>Figure 3. </em>Diffusion filtered <sup>1</sup>H NMR spectrum of the NC suspension in MeOD at 1.3 equivalents PA-hex-PEG added.</p> <p><strong>4. Figure 4.pxp</strong>: Experimental data for <em>Figure 4.</em> (A) and (B) <sup>31</sup>P NMR spectra of PA-PEG and PA-hex-PEG functionalized NCs at different D<sub>2</sub>O volume %. (C) Free ligand fraction for PA-PEG and PA-hex-PEG at different D<sub>2</sub>O volume %, determined by peak deconvolution.</p> <p><strong>5. Figure 5.pxp</strong>: Experimental data for <em>Figure 5.</em> (A) Ligand exchange performed between MEEAA functionalized NCs and nitrodopamine-mPEG. (B) <sup>1</sup>H NMR spectra before and after the ligand exchange titration performed in D<sub>2</sub>O with nitrodopamine-mPEG. 1.5 equivalents of nitrodopamine-mPEG were added and the pH was kept above 5 at all times during addition, the purified nitrodopamine functionalized NC spectrum was measured at pH = 7.4. CNC = 128 µmol.L<sup>-1</sup>, corresponding to 14.4 mg NCs of this size in 2 ml D<sub>2</sub>O.</p> <p><strong>6. Figure 6.pxp</strong>: Experimental data for <em>Figure 6. </em>Effect of pH on ligand binding and stability in water for purified NCs functionalized with PA-PEG, PA-hex-PEG and nitrodopamine-mPEG. (A) Bound and unbound ligand fraction in D<sub>2</sub>O based on NMR peak deconvolution at different pH values. (B) Z-average value of NCs in DLS at different pH values. (C) Zeta potential of the NCs at different pH values. All measurements were performed at constant ionic strength (0.01 mol.L<sup>-1</sup> NaCl) at 25°C</p> <p><strong>7. Figure 7.pxp</strong>: Experimental data for <em>Figure 7.</em> Stability of functionalized NCs in different concentrations of phosphate buffered saline (PBS) at pH 7.4 and 25°C. (A) Colloidal stability of functionalized nanocrystals measured using DLS z-average values at different PBS concentrations. (B) Stability of functionalized NCs in 2X PBS over time at pH 7.4 and 25°C.</p> <p><strong>8. Figure 9.pxp</strong>: Experimental data for <em>Figure 9.</em> UV-VIS spectra of purified nitrodopamine-mPEG functionalized NCs at different pH values in H2O.</p> <p> </p>
Comprehensive Evaluation of End-Point Free Energy Techniques in Carboxylated-Pillar[6]arene Host-guest Binding: I. Standard Procedure
<p>All the initial structures as well as the Autodock docked ligand poses used and the computational results.</p>
Fig. 6 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 6. Molecular docking and mutagenesis assay of TwCYP712K1 from T. wilfordii. (a) Molecular docking of TwCYP712K1 with friedelin and the amino acid residues in the active site that were selected for mutagenesis. Friedelin (yellow); haem (green with red and blue). (b) The active site of TwCYP712K1 is shown as a cartoon and surface model. (c) The production of 29- hydroxyfriedelan-3-one in yeast harbour TwCYP712K1 or its mutants. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 5 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 5. The role of TwCYP712K1 in celastrol biosynthesis. (a) Network of differentially expressed CYP450s and TwOSC involved in the biosynthesis of celastrol. Transcripts are represented by circles and metabolites by squares and edges are drawn when the linear correlation coefficient is> 0.7 in that tissues. The size of each circle represents the amount of expression of the gene. The pie chart shows the ratio of gene accumulation expression in different tissues. Colour key: the root was represented by purple, the stem periderm by orange, leaves by green, the stem vascular bundle by blue and flowers by red. (b) Relative expression of TwCYP712K1 in RNAi suspension cells and control suspension cells. (c) Relative expression of TwCYP712K1 in the overexpression suspension cells and control suspension cells. (d) Celastrol content in the RNAi suspension cells, overexpression suspension cells and their control suspension cells. Student's t-test was used to test for significant differences in gene expression levels and celastrol levels between the control group and experimental group. The data represent the average ± SD of at least three independent lines of suspension cells. CK, control group; OE, overexpression group; and RI, RNA interference group. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 4 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 4. Gas chromatography-mass spectrometry (GC-MS) analysis of the products in yeast strains harbouring TwCYP712K1 from T. wilfordii. (a) Gas chromatographymass spectrometry (GC-MS) analysis of the products in yeast strains harbouring TwCYP712K1 from T. wilfordii. Peak 1, friedelin; Peak 2, 29-hydroxyfriedelan-3-one; Peak 4, polpunonic acid. (b) The reaction catalysed by TwCYP712K1. TIC, Total Ion Chromatography; EIC, Extracted Ion Chromatogram.
Fig. 3 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 3. Phylogenetic tree of candidate P450s from T. wilfordii. The maximum-likelihood method was used to construct this tree with 1000 replicate bootstrap supports.
Fig. 2 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 2. Hierarchical clustering of RNA-Seq expression data and heat map depicting the expression profile of candidate P450 genes. (a) The gene expression of candidate P450 genes in different tissues of T. wilfordii. (b) The gene expression of candidate P450 genes in MeJA-induced suspension cells of T. wilfordii. Colour key: candidate CYP72 family genes (blue), candidate CYP450 genes showing specific expression in the root and induced by MeJA (red), and other candidate CYP450 genes with high expression levels in the root and TwOSC1-3 (black). RX, root xylem; RP, root phloem; RB, root periderm; PS, stem vascular bundle; SB, stem periderm; F, Flowers; and L, Leaves. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in Cytochrome P450 catalyses the 29-carboxyl group formation of celastrol
Fig. 1. The proposed carboxyl group formation of celastrol at the C-29 position and carboxyl group formation of β-amyrin at C-30 position by other cytochrome P450s. The red dashed arrows indicate one or multiple proposed step reactions, and the black solid arrow indicates a biosynthetic reaction catalysed by known CYP450 genes. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Maximum carboxylation rate estimation with chlorophyll content as a proxy of rubisco content
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Figure 2 from: Marchyshyn S, Slobodianiuk L, Budniak L, Skrynchuk O (2021) Analysis of carboxylic acids of Crambe cordifolia Steven. Pharmacia 68(1): 15-21. https://doi.org/10.3897/pharmacia.68.e56715
Figure 2 Analysis of organic acids by HPLC. (A) Calibration curves for tartaric acid; (B) Calibration curves for pyruvic acid; (C) Calibration curves for isocitric acid; (D) Calibration curves for citric acid. (E) Calibration curves for succinic acid; (F) Calibration curves for malic acid.
Data from: Specialized roots of Velloziaceae weather quartzite rock while mobilizing phosphorus using carboxylates
1.Campos rupestres is an extremely phosphorus (P)‐impoverished rocky ecosystem in Brazil. Velloziaceae is an important plant family in this environment, and some species colonize exposed quartzite rock. However, we know virtually nothing about their root development and nutrient acquisition within the rock outcrops and their possible role in rock weathering and landscape formation. 2.We tested the hypothesis that Velloziaceae dissolve P from the rock, enhancing rock‐weathering. The study was carried out with two Barbacenia species (Velloziaceae) that colonize quartzite rocks. We assessed the root specializations and exudates, and determined the mineralogical composition of the rocks. 3.The quartzite rocks contained a low concentration of total P in a matrix composed predominantly of silica. Using transmission electron microscopy, we show root growth perpendicular to the rock‐bedding planes. A micro‐XRF setup at the XRF beamline of a synchrotron evidenced root‐associated rock dissolution. 4.The investigated roots show novel morphological and physiological specializations, coined vellozioid roots, which are highly effective at P acquisition. These carboxylate‐releasing roots function like others specialized roots in nutrient‐depleted soils. The rocks represent a barrier for most species, but due to their chemical and physical actions inside the rocks, vellozioid roots play a pivotal role in rock weathering, contributing to shaping the campos rupestres landscapes.
Data from: Catalytic synthesis of n-butyl carboxylate with immobilized ionic liquid based on RSM optimization
Catalytic synthesis of n-butyl formate, n-butyl acetate, n-butyl propionate and n-butyl butyrate using four synthesized functional ionic liquids, 1-(3-sulfonapropyl)-1-methyl pyrrolidone sulfate hydrogen salt ([C3SO3Hnmp]HSO4), 1-(3-sulfopropyl)-1-methylpyrrolidone p-toluene sulfonate ([C3SO3Hnmp]CH3SO3H), 1-(3-sulfopropyl)-1-methyl pyrrolidone methyl sulfonate ([C3SO3Hnmp]C6H6SO3H), and 1-(3-sulfopropyl)-1-methyl pyrrolidone phosphate ([C3SO3Hnmp]H2PO4) was studied. Butyl butyrate was selected as the research object. The ionic liquid 1-(3-sulfopropyl)-1-methylpyrrolidone bisulfate ([C3SO3Hnmp]HSO4), which had the best catalytic effect on butyl butyrate, was immobilized and tested. The effects of reaction temperature, reaction time, molar ratio of acid to alcohol and catalyst dosage were investigated. Response surface methodology (RSM) was used to optimize the process conditions, and the optimal process conditions were obtained. The supported ionic liquid [C3SO3Hnmp]HSO4 maintained high catalytic activity after 5 cycles.
Spin-Crossover Grafted Monolayer of a Co(II) Terpyridine Derivative Functionalized with Carboxylic Acid Groups
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From e-waste to green catalyst: Gold-loaded covalent organic framework catalyzes carboxylation of terminal alkynes
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Selective adsorption of magnesium using lithium carboxylate-based Covalent Organic Frameworks
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A Ph1 Study in Healthy Male Japanese and Caucasian After Single and Multiple Doses of D5884(Omega-3-carboxylic Acids)
ClinicalTrials.gov study NCT02209766. IPD Sharing: Not stated. Countries: 1. Publications: 0.
A Study to Investigate the Safety, Tolerability, and Pharmacokinetics (PK) of Oseltamivir and Its Carboxylate Metabolite, RO0640802 in Healthy Participants
ClinicalTrials.gov study NCT02717754. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.