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141 results for “cellulose”
Application and characterization of poly(vinyl alcohol) reinforced with cellulose nanofibrils as a coating for wood – Supplementary material
<p>Supplementary material to the article "Application and characterization of poly(vinyl alcohol) reinforced with cellulose nanofibrils as a coating for wood"</p>
Wood alpha-cellulose stable C and O isotope ratios from New Hampshire and Vermont
To quantify the effects of tree height and canopy position on delta13C and delta18O of wood cellulose, we sampled 399 trees and saplings of eight species at nine forest stands across New Hampshire and Vermont, along with nearby saplings growing in the open. Samples were collected in 2017-18, and we analyzed the combined alpha-cellulose from growth rings formed in 2013-2017 for each tree. Carbon data are published in: Vadeboncoeur, M., K. Jennings, A. Ouimette, and H. Asbjornsen. (2020) Correcting tree-ring d13C time series for tree-size effects in eight temperate tree species. Tree Physiology. https://doi.org/10.1093/treephys/tpz138
Cellulose test MD dataset for analysis with Galaxy and BRIDGE
<p>This coordinate and trajectory dataset is that of cellulase and octaose substrate in water. It has been derived from the <a href="https://www.rcsb.org/structure/7cel">7CEL PDB</a> structure of a fungal cellobiohydrolase. </p> <p>The original enzyme has been modified to revert the mutation at position 217 and to include disulfide bonds. The octaose substrate is an oligosaccharide consisting of 8 beta 1-4 linked glucose monomers. The enzyme and substrate have been placed in a cubic TIP3P water box containing 0.15 M ions (NaCl).</p> <p>The files includes are: </p> <ul> <li><strong>cbh1test.pdb</strong>: the coordinates of the entire system (water, protein and substrate) in PDB format. </li> <li><strong>cbh1test.dcd</strong>: a short MD trajectory (16 frames) in CHARMM DCD format.</li> </ul>
Leaf water and stem cellulose oxygen isotope ratios simulated with global dynamic vegetation model LPX-Bern
<p>Description of leaf water and stem cellulose oxygen isotope ratios simulated with LPX-Bern</p> <p>Citation of describing paper:</p> <p>Keel SG, Joos F, Spahni R, Saurer M, Weigt RB, Klesse S. 2016. Simulating oxygen isotope ratios in tree ring cellulose using a dynamic global vegetation model, Biogeosciences, 13, 3869–3886, 2016 doi:10.5194/bg-13-3869-2016</p> <p>download: www.biogeosciences.net/13/3869/2016/</p> <p>General Information: Format: NetCDF, gridded</p> <p>Model: Dynamic global vegetation model LPX-Bern Version 1.0 (Land surface Processes and eXchanges, Bern) (Spahni et al., 2013; Stocker et al., 2013)</p> <p>Resolution: 3.75° x 2.5° lat/lon global Time: Monthly from Jan 1960 to Dec 2012</p> <p>Variables:</p> <p>cellu18: monthly stem cellulose δ18O (per mil) lw18: monthly leaf water δ18O (per mil) -2 NPP: monthly net primary production (g C m ) FPC: monthly fractional plant cover</p> <p>Dimensions: i=longitude, j=latitude, l=time, k=plant functional type Codes for plant functional types (k):</p> <ol> <li> <p>1 tropical broad-leaved evergreen</p> </li> <li> <p>2 tropical broad-leaved deciduous (raingreen)</p> </li> <li> <p>3 temperate needle-leaved evergreen</p> </li> <li> <p>4 temperate broad-leaved evergreen</p> </li> <li> <p>5 temperate broad-leaved deciduous (summergreen)</p> </li> <li> <p>6 boreal needle-leaved evergreen</p> </li> <li> <p>7 boreal needle-leaved deciduous (summergreen)</p> </li> <li> <p>8 boreal broad-leaved deciduous (summergreen)</p> </li> <li> <p>9 temperate herbaceous</p> </li> <li> <p>10 tropical herbaceous</p> </li> </ol>
Reconstitution of August SPEI3 drought index based on the δ18O in tree-ring cellulose for the Eastern Carpathian, for the period 1331-2012CE
<p>Here we report the reconstruction of the summer (June to August) Standardized Precipitation-Evapotranspiration Index (SPEI3), for the period 1331-2012CE, for eastern Europe, based on annually-resolved stable oxygen isotope ratios (δ<sup>18</sup>O) from Pinus cembra L. tree-ring cellulose from the Călimani Mountains, Romania. Variations of the δ18O values capture the August SPEI3 changes both at high and low frequencies (from interannual to multidecadal scales).<br> <br> The palaeoclimate potential of stable isotopes in Pinus cembra L. (Swiss stone pine) tree-ring cellulose from the Călimani Mountains has been demonstrated by Nagavciuc et al. 2019 (DOI: 10.1002/joc.6349), showing that δ18O variability allows high-resolution paleoclimatic reconstructions over the eastern part of Europe, where few such reconstructions are available.</p>
Data to Single fibre coating of viscose filaments with cellulose acetate
<p>Evaluation data for the manuskript with the preliminary title:</p> <p>Single fibre coating of viscose filaments with cellulose acetate for partially hydrophobic hybrid fibres</p>
Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets
<p>Hydrogels were prepared by esterification of chitosan (Cs) with monochloroacetic acid to produce CMCs which was then crosslinked to HEC using citric acid as the crosslinking agent. To impart a stimuli responsiveness property to the hydrogels, polydiacetylene-zinc oxide (PDA-ZnO) nanosheets were synthesized in-situ during the crosslinking reaction followed by photopolymerization of the resultant composite. First, 10,12-pentacosadiynoic acid (PCDA) head groups were stabilized with ZnO nanoparticles in the presence of CMCs-HEC hydrogels in petroleum ether. This was followed by irradiating the composite with Uv radiation to photopolymerize the PCDA to PDA within the hydrogel matrix so as to impart thermal and pH responsiveness to the hydrogel</p>
Cellulosic Biofuels Diversity Experiment at the Kellogg Biological Station, Hickory Corners, MI (2006 to 2017)
Dataset Abstract The Cellulosic Biofuels Diversity Experiment is an additional long-term study located within the LTER Main Site complex, in which a series of 12 different cropping systems vary in species makeup and nitrogen input. Treatments include continuous corn, corn-soybean, two variations of switchgrass fertilized differently, a C3 – C4 grass mix, and prairie grasses native to Michigan with different numbers of species. Switchgrass varieties are Cave-in rock (commercial non-native) and Southlow commercial native). Prairie grasses include switchgrass (Panicum virgatum), big bluestem (Andropogon gerardii), little bluestem (Schizachyrium scoparium), and Indian grass (Sorghastrum nutans), Treatment plots are 9.1 by 27m (30 × 40 feet) replicated in each of 4 randomized blocks. The study site was established in 2008. Click on the image for a printable map of the study area. original data source http://lter.kbs.msu.edu/datasets/109
In-place molecular preservation of cellulose in 5000-year-old archaeological textiles
<p>AFM-IR, FT-IR, SHG and µCT datasets associated to the paper "In-place molecular preservation of cellulose in 5000-year-old archaeological textiles"</p>
Dataf from: Global patterns and controls of nutrient immobilization on decomposing cellulose in riverine ecosystems
<p>Microbes play a critical role in plant litter decomposition and influence the fate of carbon in rivers and riparian zones. When decomposing low-nutrient plant litter, microbes acquire nitrogen (N) and phosphorus (P) from the environment (i.e., nutrient immobilization), and this process is potentially sensitive to nutrient loading and changing climate. Nonetheless, environmental controls on immobilization are poorly understood because rates are also influenced by plant litter chemistry, which is coupled to the same environmental factors. Here we used a standardized, low-nutrient organic matter substrate (cotton strips) to quantify nutrient immobilization at 100 paired stream and riparian sites representing 11 biomes worldwide. Immobilization rates varied by three orders of magnitude, were greater in rivers than riparian zones, and were strongly correlated to decomposition rates. In rivers, P immobilization rates were controlled by surface water phosphate concentrations, but N immobilization rates were not related to inorganic N. The N:P of immobilized nutrients was tightly constrained to a molar ratio of 10:1 despite wide variation in surface water N:P. Immobilization rates were temperature-dependent in riparian zones but not related to temperature in rivers. However, in rivers nutrient supply ultimately controlled whether microbes could achieve the maximum expected decomposition rate at a given temperature. Collectively, we demonstrated that exogenous nutrient supply and immobilization are critical control points for decomposition of organic matter.</p>
DATASET: Biobased composites by photoinduced polymerization of car-danol methacrylate with microfibrillated cellulose - FTIR data
<p>Raw FTIR data for the article "Biobased composites by photoinduced polymerization of car-danol methacrylate with microfibrillated cellulose"</p>
Imaging data of mechanically loaded, micro-patterned, silk-reinforced cellulose films with gold coating for flexible electrodes in medical implants
<p>Neurodegenerative diseases can be treated using a functional interface between the physically soft tissue such as brain and the man-made electrodes. The orders of magnitude harder neural probes cause local injuries, due to periodic micromovements owing to breathing and pulsatile blood flow leading to encapsulation and related collapsing signals. An alternative to the currently used neural implant films including polyimide, poly(p-xylylene), SU-8 - epoxy-based negative photoresist, liquid crystal polymer, and benzocyclobutene is the natural polymer cellulose with an elastic modulus between 100 and 200 MPa. This article elucidates the measurement of the mechanical properties of bare as well as mono- and double-layer silk-reinforced cellulose in phosphate-buffered saline using a universal testing machine. In addition, the article contains electron microscopy data of these micro-structured, gold-coated films subsequent to peel-off tests to access the impact of micro-structures on gold adhesion on cellulose. These imaging data were completed by electron micrographs of mechanically loaded gold-coated cellulose films to demonstrate the impact of micro-structures on crack formation. Finally, the phosphate-buffered saline-induced swelling of the micro-structure was visualized by electron micrographs obtained before and after two-month storage in air and phosphate-buffered saline, respectively.</p>
Precision synthesis of reducing-end thiol-modified cellulose enabled by enzyme selection
<p>We provide here the underlying data of the publication "Precision synthesis of reducing-end thiol-modified cellulose enabled by enzyme selection". Please find the abstract below.</p> <p>Enzyme-catalyzed iterative <em>β</em>-1,4-glycosylation of <em>β</em>-glycosides is promising for bottom-up polymerization of reducing-end-modified cello-oligosaccharide chains. Self-assembly of the chains from solution yields crystalline nanocellulose materials with properties that are tunable by the glycoside group used. Cellulose chains with a reducing-end thiol group are of interest to install a controllable pattern of site-selective modifications into the nanocellulose material. Selection of the polymerizing enzyme (cellodextrin phosphorylase; CdP) was pursued here to enhance the synthetic precision of <em>β</em>-1-thio-glucose conversion to generate pure “1-thio-cellulose” (≥95%) unencumbered by plain (unlabeled) cellulose resulting from enzymatic side reactions. The CdP from <em>Clostridium stercorarium</em> (<em>Cs</em>CdP) was 21 times more active on <em>β</em>-1-thio-glucose (0.17 U/mg; 45 °C) than the CdP from <em>Clostridium cellulosi</em> (<em>Cc</em>CdP), and it lacked hydrolase activity, which is substantial in <em>Cc</em>CdP, against the α-D-glucose 1-phosphate donor substrate. The combination of these enzyme properties indicated that <em>Cs</em>CdP is a practical catalyst for 1-thio-cellulose synthesis directly from <em>β</em>-1-thio-glucose (8 h; 25 mol% yield) that does not require a second enzyme (cellobiose phosphorylase), which was essential when using the less selective <em>Cc</em>CdP. The 1-thio-cellulose chains had an average degree of polymerization of ∼10 and were assembled into highly crystalline cellulose II crystallinity material.</p>
Cost of ligno-cellulosic biomass production for bioenergy in 45 countries
<p>This database provides data on ligno-cellulosic biomass production costs in 45 countries. It is the result of a compilation of data from a literature search carried out on the Google Scholar platform based on the following keywords: ‘biomass’, ‘bioenergy’, ‘energy crops’, ‘cost’, ‘economics’, ‘analysis’, ‘ligno-cellulosic’, ‘managed forest’, ‘wood crop’, ‘grass crop’, ‘crop residues’ (similar keywords such as wood crop or gass crop were also used). It includes 106 documents published between 1988 and 2018, including 59 journal articles, 15 non peer-reviewed articles, 6 conference publications, 20 government agency reports, and 4 PhD or Master’s theses. The total number of data points is 410, unevenly distributed among the five biomass types (managed forest, wood energy crops, grass energy crops, agricultural residues and forest residues and six global regions (Africa, Asia, Latin America, Former Soviet Union, Europe and North America).</p>
Data for the paper: The Role of Glycerol in Manufacturing Freeze-Dried Chitosan and Cellulose Foams for Mechanically Stable Scaffolds in Skin Tissue Engineering
<p>The Dataset contains all the data, described in the article "<strong>The Role of Glycerol in Manufacturing Freeze-Dried Chitosan </strong><br><strong>and Cellulose Foams for Mechanically Stable Scaffolds in Skin Tissue Engineering</strong>."</p> <p><strong><em>Abstract</em></strong><br>Various strategies have extensively explored enhancing the physical and biological properties of chitosan and cellulose scaffolds for skin tissue engineering. This study presents a straightforward method involving the addition of glycerol into highly porous structures of two polysaccharide complexes: chitosan/carboxymethyl cellulose (Chit/CMC) and chitosan/oxidized cellulose (Chit/OC); during a one-step freeze-drying process. Adding glycerol, especially to Chit/CMC, significantly increased stability, prevented degradation, and improved mechanical strength by nearly 50%. Importantly, after 21 days of incubation in enzymatic medium Chit/CMC scaffold has almost completely decomposed, while foams reinforced with glycerol exhibited only 40% mass loss. It is possible due to differences in multivalent cations and polymer chain contraction, resulting in varied hydrogen bonding <br>and, consequently, distinct physicochemical outcomes. Additionally, the scaffolds with glycerol improved the cellular activities resulting in over 40% higher proliferation of fibroblast after 21 days of incubation. It was achieved by imparting water resistance to the highly absorbent material and aiding in achieving a balance between hydrophilic and hydrophobic properties. This study clearly indicates the possible elimination of additional crosslinkers and multiple fabrication steps that can reduce the cost of scaffold production for skin tissue engineering applications while tailoring mechanical strength and degradation.</p> <p><strong>Figure 2.</strong> Morphology. SEM micrographs of the internal structure of the freeze-dried scaffolds. Results of porosity analysis. The methodology and data are described in the README file in the folder.</p> <p><strong>Figure 3.</strong> Mechanical test results. Representative stress-strain curves from the tensile test of all freeze-dried scaffolds, where (A)<br>– measurement performed in dry conditions, (B) – measurement performed in wet conditions. All are described in the README file in the folder.</p> <p><strong>Figure 4. </strong>Swelling behavior of all scaffolds. B – Two representative vials with a visual demonstration of swelling, samples marked with circles: Chit/CMC sample submerged in the PBS (blue circle) and Chit/CMC/Glyc sample floating on the surface (green circle). The arrows lead to photos of scaffolds taken from vials directly after swelling. C – Gel fraction analysis in aqueous solution after 24 <br>6 h. D – Time after which the water droplet is absorbed into the scaffold. E – Photographs of water droplet shape changes on Chit/CMC and Chit/CMC/Glyc scaffolds over time. All are described in the README file in the folder.</p> <p><strong>Figure 5</strong>. Fourier Transform Infrared Spectroscopy (ATR-FTIR) analysis results. Details are in the README file in the folder.</p> <p><strong>Figure 6.</strong> The FTIR spectra of eluates from degraded scaffolds collected on a microscopic glass slide. Details are in the README file in the folder.</p> <p><strong>Figure 7.</strong> The degradation studies of all scaffolds over 21 days of experiments in A – enzymatic medium. B – cell culture medium. Details are in the README file in the folder.</p> <p><strong>Figure 9. </strong>Cell experiments and toxicity analysis. Cytotoxicity of eluates taken from degraded scaffolds. B – Direct fibroblast seeding on scaffolds during 14 days of culture period. C – Direct fibroblast seeding on scaffolds during 14 days of culture period without control to better see the effect of glycerol. Details are in the README file in the folder.</p>
Data, plotting scripts, and figures for "Computational study of the effects of density, fuel content, and moisture content on smoldering propagation of cellulose and hemicellulose mixtures"
<p>This bundle of files contains all the data and plotting scripts for "Computational study of the effects of density, fuel content, and moisture content on smoldering propagation of cellulose and hemicellulose mixtures", as well as the figures themselves.</p> <p>These results are part of the paper:</p> <p>Tejas Chandrashekhar Mulky and Kyle E. Niemeyer. "Computational study of the effects of density, fuel content, and moisture content on smoldering propagation of cellulose and hemicellulose mixtures," 2018. Accepted for publication in <em>Proceedings of the Combustion Institute</em>, available via <a href="https://arxiv.org/abs/1806.08396">https://arxiv.org/abs/1806.08396</a></p>
Cellulose test input dataset for simulations with Galaxy and BRIDGE
<p>This coordinate and protein structure file dataset is that of cellulase and octaose substrate <em>in vacuo</em>. It has been derived from the <a href="https://www.rcsb.org/structure/7cel">7CEL PDB</a> structure of a fungal cellobiohydrolase. </p> <p>The original enzyme has been modified to revert the mutation at position 217 and to include disulfide bonds. The octaose substrate is an oligosaccharide consisting of 8 beta 1-4 linked glucose monomers. </p> <p>The files includes are: </p> <ul> <li><strong>cbh1test.crd</strong>: the coordinates of the entire system (protein and substrate) in CHARMM coordinate format. </li> <li><strong>cbh1test.psf</strong>: the CHARMM protein structure file which contains lists of molecular information including atomic masses, all bond pairs, angle triples and so on.</li> </ul>
Supplemental material for "Computational study of the dissolution of cellulose into single chains: the role of the solvent and agitation"
<p>Input-scripts and data-files from the Cellulose article "Computational study of the dissolution of cellulose into single chains: the role of the solvent and agitation" by Bering, E., Torstensen, J., Lervik, A., Wijn, A. S.</p> <p># Content</p> <p>The folder "glycamstructures" contains the output from GLYCAM carbohydrate builder with force-field parameters, coordinates and topology of a single chain of cellulose composed of 4 cellobiose units.</p> <p>The folder "intermol" contains the output from the software Intermol were the content of "glycamstructures" is translated into the lingo of LAMMPS.</p> <p>The folder "packmol" contains input files for the software Packmol, which was used for creating coordinate-files for solvated systems of cellulose with water and cellulose with the solvent mixture. (The bash-script clean.sh fixes the formatting of the .xyz-files such that LAMMPS can read it.)</p> <p>The folder "36bundle" contains input files for creating the initial configuration of the bundle with 36 chains in a maze configuration, namely 36bundle.sh reads 1chain.xyz to make the coordinate file 36bundle.xyz. Further, nvt00.in is the initial LAMMPS script for slowly starting up this system with the NVT-ensemble, which reads system information from the LAMMPS-datafile chain.36bundle, cellulose parameters from the LAMMPS-datafile data.cellulose_nohybrid and coordinates from 36bundle.xyz. nvt01.in and nvt02.in continues sequentially, resulting in the configuration stored in the LAMMPS data-file chain.nvt02.</p> <p>The folder "36bundle_mix" continues from 36bundle by first adding the solvent mixture with coordinates from Packmol in the file 36bm.xyz and slowly starting up in the NVT-ensemble with nvt00.in, with force-field parameters in data.cellulose.in, data.water_spce.in, data.naoh.in and data.urea.in, with charges and connectivity of the solvent molecules in the files water_spce.txt, naoh.txt and urea.txt. The LAMMPS script npt00.in continues with the NPT-ensemble, which is continued with npt01.in etc., resulting in the configuration stored in the LAMMPS data-file chain.npt06. These systems can be continued with length- or force-controlled oscillatory stretching/compression with osc_length.in and osc_force.in respectively, which was used to make the configurations stored in the LAMMPS data-files chain.osc_length4 and chain.osc_force4.</p> <p>Similarly, the folder "36bundle_water" continues from 36bundle by first adding the water with coordinates from Packmol in the file 36bw.xyz and slowly starting up in the NVT-ensemble with nvt00.in, with force-field parameters in data.cellulose.in and data.water_spce.in, with charges and connectivity of the water molecules in the file water_spce.txt. Again, these systems can be continued with length- or force-controlled oscillatory stretching/compression with osc_length.in and osc_force.in respectively, which was used to make the configurations stored in the LAMMPS data-files chain.osc_length4 and chain.osc_force4.</p>
Cellulose nanofiber-reinforced solid polymer electrolytes with high ionic conductivity for lithium batteries
<p>The data contained herein support both the results described in the research article entitled "Cellulose nanofiber-reinforced solid polymer electrolytes with high ionic conductivity for lithium batteries" with the following DOI: <a href="https://doi.org/10.1039/D3TA00380A">10.1039/D3TA00380A</a>, and the corresponding supporting information.</p>
Extended ensemble molecular dynamics study of ammonia–cellulose I complex crystal models: free-energy landscape and atomistic pictures of ammonia diffusion in the crystalline phase.
<p>The data deposited here accompany the manuscript "Extended ensemble molecular dynamics study of ammonia–cellulose I complex crystal models: free-energy landscape and atomistic pictures of ammonia diffusion in the crystalline phase" and include the molecular dynamics trajectories and the AMBER topology (parm) files. Detailed file contents are summarized in the README file.</p>
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