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550 results for “copper”
Dianthus sylvestris subsp. sylvestris as a promising candidate for phytostabilization of copper-contaminated post-mining sites in Alpine ecosystems
<p>The lack of remediation of inactive mine sites is a serious global concern, as they pose risks to the environment, human health, and safety. The potential of <em>Dianthus sylvestris</em> subsp. <em>sylvestris</em> to remediate post-mining sites contaminated with copper (Cu) at high altitudes, which is a challenging task for most management strategies, was explored in this study. More than 1300 mg Cu kg<sup>-1</sup> in shoots were found in plants collected at the Monte Avanza legacy mine site (Alps). However, it is unclear whether this is due to hyperaccumulation or foliar contamination. To address this gap, field samples were washed with two different protocols, and a controlled Cu-tolerance test was conducted. While very high Cu concentrations, exceeding the Cu hyperaccumulation threshold of 300 mg kg<sup>-1</sup>, were found in samples washed with water, results for the plants cleaned with a more rigorous approach with EDTA suggested Cu exclusion strategy. Under controlled conditions, the plant showed Cu hypertolerance but did not hyperaccumulate Cu. Thus <em>D. sylvestris</em> presents a Cu exclusion strategy rather than hyperaccumulation potential, making it a suitable candidate for Cu phytostabilization at high-altitude legacy mine sites. The study emphasizes the need for experiments under controlled conditions when assessing the phytoremediation potential.</p>
Naquada Culture Copper Adze
Adze is one of the most typical Egyptian tools. Used for woodwork, stone cutting, masonry and even helped farmers in everyday agricultural activities. During Naqada period such objects were very often found in graves in a toolkit sets together with axe and chisel. 3D model was made as a part of the project financed under the National Science Center of Poland grant UMO-2014/15/N/HS3/01144 "The comparative analyses of Early Bronze Age Egyptian and Southern Levantine copper tools including the influences from the Arabian Peninsula and Mesopotamia region". Source: Objaverse 1.0 / Sketchfab
Guerrero Copper Sheet in Bedrock No.2 (2019)
Site 2-04-8MO02343: Pieces of crumpled copper sheet driven into holes in the limestone bedrock, as well as fused to the surface of it. This metal sheeting once covered the lower hull of the ship to prevent shipworm infestation and fouling of the bottom. Model created June, 2019. Scale = 5 centimeters. Source: Objaverse 1.0 / Sketchfab
Copper temple ring
ID no.: MAK/KA/245/100 Archaeological Museum in Kraków https://muzea.malopolska.pl/en/objects-list/1476 Digitalisation: RDW MIC, Virtual Małopolska project Source: Objaverse 1.0 / Sketchfab
Guerrero Copper Spike on Bedrock (2019)
Site 2-04-8MO02343 Copper Spike. This spike, approximately 16 centimeters long, sits in a shallow recess in the bedrock. It is one of many copper spikes found across the shipwreck site. This model was made in June, 2019. Scale = 5 centimeters. Source: Objaverse 1.0 / Sketchfab
Bowl from the Late Copper Age
Recently our museum has an excavation near the village Szurdokpüspöki, where we have found this bowl from the Late Copper Age. This is the "in situ" state in the pit, which contained it. Source: Objaverse 1.0 / Sketchfab
Copper Bull of the Tel Halaf Culture
Copper, showing a heavy green patina; bull of the Tel Halaf Culture in present-day northern Syria; measuring 3 ¾" high x 1¾" wide x 3½" long) ca. 3500 B.C. Source: Objaverse 1.0 / Sketchfab
THE COPPER CAULDRON
The copper cauldron. The Staroselsky teryuhansky cemetery. 13th-14th centuries. This artefact is exposed in the centre of the traditional culture in the village Tatarskoe (Nizhniy Novgorod oblast). https://vk.com/vetarchexpedition - more information you can get here. This cauldron belongs to the type of funerary ware among the Mordovian tribes of the middle ages. The cauldron is squat in shape, and the lugs and handle are also made of iron. Most of these copper cauldrons belong to the Golden Horde time. It should be noted that this copper cauldron was made by a local teryukhan master. Source: Objaverse 1.0 / Sketchfab
Little Prince - Copper_02 - Ancient Rome Bust
PROFESIONAL FREE 3D models for Architectural visualization, game, render ready, PBR material - more modeds - herosstudio.eu Ancient Rome Bust - Little Prince. Copper. Create from 3D scanning bust. Real world scale - centered at origin. Object Dimensions: X 40.4cm / Y 46cm / Z 61.5cm. Polygons: 1891. Low polygonal High Quality mesh. Hand made retopology. Only quads polygons. Hand made Unwrapped UVs - Non-overlapping. Materials are PBR (Physically-Based Rendering). High resolution Texture 4K - 4096x4096 - BSDF Princeple Pixar shader - Clarisse iFX - Cycles-EEVEE - Blender, Cinema 4D - Renderman - Blender, Maya, Houdini, Katana - Corona - 3D Studio Max, Cinema 4D - MODO - PBR Metal Rough - Arnold - 3D Studio Max, Maya, Cinema 4D,Houdini, Katana - Octane - 3D Studio Max, Maya, Blender, Cinema 4D, Houdini, LightWave, MODO, NUKE, SketchUp - Redshift - 3D Studio Max, Maya, C4D, Houdini, Katana - iClone - Unity - Unreal - Vray - 3D Studio Max, Maya, Blender, Cinema 4D, MODO, NUKE, Katana, SketchUp, Unreal Source: Objaverse 1.0 / Sketchfab
Manufacturing of high strength and high conductivity copper with laser powder bed fusion
<p>Additive manufacturing (AM), known as 3D printing, enables rapid fabrication of geometrically complex copper (Cu) components for electrical conduction and heat management applications. However, pure Cu or Cu alloys produced by 3D printing often suffer from either low strength or low conductivity at room and elevated temperatures. Here, we demonstrate a design strategy for 3D printing of high strength, high conductivity Cu by uniformly dispersing a minor portion of lanthanum hexaboride (LaB<sub>6</sub>) nanoparticles in pure Cu through laser powder bed fusion (L-PBF). We show that trace additions of LaB<sub>6</sub> to pure Cu result in an improved L-PBF processability, an enhanced strength, and improved thermal stability, all whilst maintaining a high conductivity. The presented strategy could expand the applicability of 3D-printed Cu components to more demanding conditions where high strength, high conductivity, and thermal stability are required.</p>
Data for "Electron–Hole Asymmetry of Quantum Collective Excitations in High-Tc Copper Oxides"
<p>This data set contains raw simulation data for M. Fidrysiak, "Electron-Hole Asymmetry of Quantum Collective Excitations in High-Tc Copper Oxides", Acta Phys. Polon. A 143, 180 (2023); doi: https://doi.org/10.12693/APhysPolA.143.180. </p>
Prehistoric Mining sites in the Lower Inn Valley - Federal Monuments Office documentation of the project Austrian Science Fund project "Prehistoric copper production in the eastern and central Alps" (I 1670)
<p>The dataset contains all tables and RDF-triples created based on the following Federal Monuments Office Documentations</p> <ul> <li>87002.15.01_Verhuettungsplatz_suedlich_Ruine_Rottenburg: <a href="https://zenodo.org/record/5243460"> https://zenodo.org/record/5243460</a></li> <li>87002.16.01_Verhuettungsplatz_suedlich_Ruine_Rottenburg: <a href="https://zenodo.org/record/5244755"> https://zenodo.org/record/5244755</a></li> <li>87002.17.01_Verhuettungsplatz_suedlich_Ruine_Rottenburg: <a href="https://zenodo.org/record/5244794"> https://zenodo.org/record/5244794</a></li> <li>87007.15.01_Bergbaurevier_Schwaz_Brixlegg: <a href="https://zenodo.org/record/5236664"> https://zenodo.org/record/5236664</a></li> <li>87007.16.01_Bergbaurevier_Schwaz_Brixlegg: <a href="https://zenodo.org/record/5243123"> https://zenodo.org/record/5243123</a></li> <li>87009.16.01_Erzaufbereitungsplatz_Schrofen: <a href="https://zenodo.org/record/5243416"> https://zenodo.org/record/5243416</a></li> </ul>
Plasmonic Copper Sulfide Nanoparticles Enable Dark Contrast in Optical Coherence Tomography
<p>Dataset of https://onlinelibrary.wiley.com/doi/10.1002/adhm.201901627</p>
Dataset of results for a copper switch for inducing CRISPR/Cas9-based transcriptional activation tightly regulates gene expression in Nicotiana benthamiana.
<p>CRISPR-based programmable transcriptional activators (PTAs) are used in plants for rewiring gene networks. Better tuning of their activity in a time and dose-dependent manner should allow precise control of gene expression. Here, we report the optimization of a Copper Inducible system called CI-switch for conditional gene activation in Nicotiana benthamiana. In the presence of copper, the copper-responsive factor CUP2 undergoes a conformational change and binds a DNA motif named copper-binding site (CBS). In this study, we tested several activation domains fused to CUP2 and found that the non-viral Gal4 domain results in strong activation of a reporter gene equipped with a minimal promoter, offering advantages over previous designs. To connect copper regulation with downstream programmable elements, several copper-dependent configurations of the strong dCasEV2.1 PTA were assayed, aiming at maximizing activation range, while minimizing undesired background expression. The best configuration involved a dual copper regulation of the two protein components of the PTA, namely dCas9:EDLL and MS2:VPR, and a constitutive RNA pol III-driven expression of the third component, a guide RNA with anchoring sites for the MS2 RNA-binding domain. With these optimizations, the CI/dCasEV2.1 system resulted in copper-dependent activation rates of 2,600-fold and 245-fold for the endogenous N. benthamiana DFR and PAL2 genes, respectively, with negligible expression in the absence of the trigger. The tight regulation of copper over CI/dCasEV2.1 makes this system ideal for the conditional production of plant-derived metabolites and recombinant proteins in the field.</p>
Enhanced durability of round bamboo treated with copper naphthenate under heat-cold impregnation
<p><span>Round bamboo has aroused much interest in construction for its mechanical properties, but poor </span><span>biological durability</span><span> seriously restricts its application. </span><span>In order</span><span> to</span><span> develop </span><span>a suitable and effective </span><span>preservative treatment </span><span>method for round bamboo</span><span>, </span><span>copper naphthenate (CuN)</span><span> was adopted and </span><span>impregnate</span><span>d</span><span> into round bamboo</span><span> using</span><span> heat-cold procedure. The distribution and retention of copper naphthenate in round bamboo</span><span> were studied</span><span>,</span><span> and the </span><span>biological durability</span><span> represented by the </span><span>mold and decay resistance were </span><span>investigated</span><span>. The results showed that </span><span>the </span><span>retention and fixation of copper </span><span>reached</span><span> 0.39 </span><span>kg/m<sup>3</sup> and 85.3%, respectively. </span><span>Scanning electron microscopy</span><span>-energy dispersive x-ray spectrometry further disclosed an increasing trend in the composition of CuN from the end inward. </span><span>X-ray photoelectron spectroscopy and </span><span>Fourier transform infrared spectroscopy analyses later revealed that CuN could be fixed on bamboo in the form of a hydrogen bond or a complex reaction. Statistical analysis showed that the increasing concentration of CuN </span><span>from </span><span>0.3%</span><span> to</span><span> 0.5% and 0.8%</span><span> (</span><span>calculated as Cu<sup>2+</sup> content) has a significant contribution against T<em>rametes versicolor</em> and <em>Gloeophyllum trabeum</em> in comparison with the untreated bamboo. </span><span>Meanwhile, when the concentration of treating solution increased to 0.8 wt.%, the resisting efficacy for </span><em><span>Aspergillus</span><span> niger</span></em><span>, </span><em><span>Penicillium citrinum,</span></em><span> and </span><em><span>Trichoderma viride</span></em> <span>soar</span><span>ed</span><span> as high as 85.9%, 94.8%, and 70.3%</span><span>,</span> <span>respectively</span><span>.</span></p>
Using photodiodes and supervised Machine Learning for automatic classification of weld defects in laser welding of thin foils copper-to-steel battery tabs
<p>In this folder, excel files are stored with the results of signal processing that supported findings in the following paper:</p> <p>"Using photodiodes and supervised Machine Learning for automatic classification of weld defects in laser welding of thin foils copper-to-steell battery tabs".</p> <p>Matlab scripts and orginal signals will be uploaded soon with more detailed description.</p> <p> </p>
An Artificial Metalloenzyme Based on a Copper Heteroscorpionate Enables sp3 C–H Functionalization via Intramolecular Carbene Insertion
<p>Data underlying the figures in the publication: Rumo, C. <em>et al.</em> “An Artificial Metalloenzyme Based on a Copper Heteroscorpionate Enables Sp3 C–H Functionalization Via Intramolecular Carbene Insertion” <em>J. Am. Chem. Soc.</em> <strong>2022</strong>, <a href="https://doi.org/10.1021/jacs.2c03311">https://doi.org/10.1021/jacs.2c03311</a></p> <p>TOC</p> <ol> <li><strong>Table_1.xlsx</strong> Source data for <em>Table 1</em></li> <li><strong>Figure_2_Relative_contribution.xlsx</strong> Source data for <em>Figure 2</em></li> <li><strong>Figure_S6_CD_titration.xlsx</strong> Source data for <em>Figure S6</em></li> <li><strong>Table_S2_Double_saturation.xlsx</strong> Source data for <em>Table S2</em></li> <li><strong>Table_S3_Complementary_data_of_selected_Sav_mutants.xlsx</strong> Source data for <em>Table S3</em></li> <li><strong>Table_S4_Substrate_scope.xlsx</strong> Source data for <em>Table S4</em></li> </ol>
Copper binding leads to increased dynamics in the regulatory N-terminal domain of full-length human copper transporter ATP7B
<p>Dataset from article "Copper binding leads to increased dynamics in the regulatory N-terminal domain of full-length human copper transporter ATP7B"</p> <p>Contains simulation input files and reduced trajectories. </p> <p>The files are sorted into four folders: reA_apo, reA_holo, reB_apo, reB_holo. Each folder contains the following (types of) files:</p> <p>Topology file: topol.top<br> Index file: index.ndx<br> Production mdp files for each replica: production_rep{i}.mdp<br> Starting structures as .gro files: ATP7B_E2_re{A/B}_{apo/holo}_rep{i}_start.gro<br> 10 ns step trajectories in .xtc format: ATP7B_E2_re{A/B}_{apo/holo}_rep{i}_trajectory.xtc<br> Folder with equilibration restraints: restraints<br> Folder with topology and forcefield: toppar</p>
Raw data for the article "Copper-Catalyzed Alkynylation of Hydrazides: An Easy Access to Functionalized Azadipeptides"
<p>Raw NMR, IR and MS data for the article "Copper-Catalyzed Alkynylation of Hydrazides: An Easy Access to Functionalized Azadipeptides" published in Organic Letters, DOI: </p> <p><a href="https://doi.org/10.1021/acs.orglett.2c02625">https://doi.org/10.1021/acs.orglett.2c02625</a></p> <p>The number of the folders correspond to compounds numbers in the article. All details concerning conditions and equipment for measurements can be found in the supporting information of the article.</p>
Thermal conductivity of copper at various temperatures
<p><strong>Thermal conductivity of copper at various temperatures</strong></p> <p>Junjie Chen</p> <p>Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China</p> <p> </p> <p>Copper is a chemical element with the atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper, silver, and gold are in group 11 of the periodic table; these three metals have one s-orbital electron on top of a filled d-electron shell and are characterized by high ductility, and electrical and thermal conductivity. The filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds. Unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is usually supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms. The softness of copper partly explains its high electrical conductivity and high thermal conductivity, second highest among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature originates primarily from scattering of electrons on thermal vibrations of the lattice, which are relatively weak in a soft metal. Copper does not react with water, but it does slowly react with atmospheric oxygen to form a layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion. Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides.</p> <p> </p> <p>Thermodynamic temperature (degrees kelvin), Thermal conductivity (watts per meter-kelvin)</p> <p>5 13800</p> <p>10 19600</p> <p>20 10500</p> <p>30 4300</p> <p>40 2050</p> <p>50 1220</p> <p>60 850</p> <p>70 670</p> <p>80 570</p> <p>90 514</p> <p>100 483</p> <p>200 413</p> <p>273 401</p> <p>300 398</p> <p>400 392</p> <p>500 388</p> <p>600 383</p> <p>700 377</p> <p>800 371</p> <p>900 364</p> <p>1000 357</p> <p>1100 350</p> <p>1200 342</p> <p>1300 334</p>
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