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30 results for “polyester”
Data from: No effect of realistic concentrations of polyester microplastic fibers on freshwater zooplankton communities
<p>Zooplankton are a conduit of energy from autotrophic phytoplankton to higher trophic levels, and they can be a primary point of entry of microplastics into the aquatic food chain. Investigating how zooplankton communities are affected by microplastic pollution is thus a key step towards understanding ecosystem-level effects of these global and ubiquitous contaminants. Although the number of studies investigating the biological effects of microplastics has grown exponentially in the last decade, the majority have used controlled laboratory experiments to quantify the impacts of microplastics on individual species. Given that all organisms live in multi-species communities in nature, here we use an outdoor 1130L mesocosm experiment to investigate the effects of microplastic exposure on natural assemblages of zooplankton. We endeavored to simulate an environmentally relevant exposure scenario by manually creating ~270,000 0.015mm x 1-1.5mm polyester fibers and inoculating mesocosms with zero, low (10 particles/L) or high (50 particles/L) concentrations. We recorded zooplankton abundance and community composition three times throughout the 12-week study. We found no effect of microplastics on zooplankton abundance, Shannon diversity, or Pielou's evenness. NMDS plots also revealed no effects of microplastics on zooplankton community composition. Our study provides a necessary and realistic baseline upon which future studies can build. Because numerous other stressors faced by zooplankton (e.g. food limitation, eutrophication, warming temperatures, pesticides) are likely to exacerbate the effects of microplastics, we caution against concluding that polyester microfibers will always have no effect on zooplankton communities. Instead, we encourage future studies to investigate the triple threats of habitat degradation, climate warming, and microplastic pollution on zooplankton community health.</p>
Sustainable polyesters via direct functionalization of lignocellulosic sugars
<p>Source data for the following publication:</p> <p>DOI: 10.1038/s41557-022-00974-5</p>
dataset for "Atomic force microscopy characterization of Polyester Grafted with poly(styrene sulfonate)"
<p>Atomic Force Microscopy (AFM) raw files of polycaprolactone (PCL) and polyethylene terephthalate (PET) non-functionalized and functionalized with poly(sodium 4-styrene sulfonate) (PNaSS) by thermal radical grafting, thermal radical grafting in the presence of redox initiator (Mohr's salt), and UV grafting. </p> <p>https://chemrxiv.org/engage/chemrxiv/article-details/60c75963842e650a5edb49f6</p> <p>DOI: 10.26434/chemrxiv.14687556</p>
A Comparison of 2-octyl Cyanoacrylate Skin Adhesive and Polyester Mesh for Wound Closure in Total Knee Arthroplasty, A Randomized Controlled Study
ClinicalTrials.gov study NCT06232018. IPD Sharing: Not stated. Countries: 1. Publications: 7.
Study of Polyester Implants for the Treatment of External Nasal Valve Collapse (NVC)
ClinicalTrials.gov study NCT00729781. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Data from: Programming aliphatic polyester degradation by engineered bacterial spores
Open the record for dataset details and reuse information.
Data from: No effect of realistic concentrations of polyester microplastic fibers on freshwater zooplankton communities
Open the record for dataset details and reuse information.
Data from: Facile fabrication of fluoro-polymer self-assembled ZnO nanoparticles mediated, durable and robust omniphobic surfaces on polyester fabrics
<p>Omniphobic surfaces have been widely used in many applications, especially due to their self-cleaning property. Omniphobicity of a surface is directly interpreted by measuring the contact angle that it makes with a liquid of interest. In this study, polyester fabric was made omniphobic with a measured water contact angle (WCA) of 152° by reducing the surface free energy of the fabric surface via the polymerization of 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate(TDM) on a ZnO seed layer. The fabrics with and without the seed layer were characterized using various analytical techniques. The WCA of the fabric with the seed layer was 153° compared to 142° of the fabric without the seed layer. The treated fabric made a contact angle of 132° with SAE 40 motor oil indicating its oleophobicity while non-treated fabric made no contact angle. In addition to that, the treated fabric is omniphobic against milk tea, coffee, coconut oil, and ethanol. The morphological analysis using scanning electron microscopy (SEM) of the treated and non-treated fabrics revealed that the particle size of the seed layer applied fabric was ranging from 100-300 nm and upon the TDM application it became less than 100 nm. Elemental analysis by EDS showed the presence of fluorine and FT-IR analysis confirmed the polymerization of TDM. The polymerization of fluoropolymer was further confirmed by TGA and DSC analyses. The contact angle of the surface-modified fabric remained unchanged even after 1.5 h washing and 50 cycles of abrasion. The modified fabric is robust and no change was observed in the colour of the fabric during the process. More importantly the preparation method of the fabric is simple, low cost and quick.</p>
Polyester simulation (source files)
<p>Source data files for simulation. </p>
Polyester simulation (with GC bias) samples 1-4
<p>Simulated reads for samples 1-4 of an 8 sample (and 2 condition) dataset. </p>
Polyester simulation (with GC bias) samples 5-8
<p>Simulated reads for samples 5-8 of an 8 sample (and 2 condition) dataset. </p>
Microbial Production of an Aromatic Homo-Polyester
<p>Supplementary datasets for the paper "Microbial Production of an Aromatic Homo-Polyester".</p>
Poly-3-hydroxybutyrate, a crystal-mobile biodegradable polyester
<p>This Dataset comprises the raw data contained in the figures of our journal article in <em>Macromolecules </em>(DOI: 10.1021/acs.macromol.4c00938) and its Supporting Information (SI)<em>. </em>We provide a preprint of the initially submitted article including the SI for reference to the figures and their captions, necessary to use the data. Note that a few figures have changed upon revision, so please also check the published article. For copyright details and licensing we refer to the published article and the publisher. Here is the abstract of the article:</p> <p>Poly(3-hydroxybutyrate), a biodegradable thermoplastic with potential to partially replace oil-based commodities, suffers from embrittlement over storage time. We here investigate possible causes by monitoring changes in mechanical and thermal properties as well as the semicrystalline morphology (crystallinity, lamellar stack dimensions and its inhomogeneity) over time, using advanced small-angle X-ray scattering analyses for the latter. We find that the slow rise in the shear modulus of the materials is accompanied by secondary crystallization, detected as a lamellar thickening and an increase of the melting point. These morphology changes may be due to chain mobility in the crystallites. This is a feature of "crystal-mobile" polymers that are known to be able to crystallize more fully than their crystal-fixed counterparts. We present first evidence of the related crystalline <em>α<sub>c</sub></em>-relaxation in P3HB by dynamic-mechanical analysis (DMA) and investigate the process microscopically by advanced magic-angle spinning solid-state exchange NMR techniques, specifically centerband-only detection of exchange. We show that monomer jumps in the P3HB crystals are comparably slow (i.e., with an average correlation time <em>τ<sub>c</sub></em> of 0.1 s at 120 °C). Their apparent activation energy (80-90 kJ/mol) is found to be independent of the crystallization temperature and in good agreement with the DMA results.</p>
Fig. 3 in Extracellular lipids of Camelina sativa: Characterization of cutin and suberin reveals typical polyester monomers and unusual dicarboxylic fatty acids
Fig. 3. Annotated chromatograms of TMSi derivatives of C. sativa leaf cutin (A) and root suberin (B) monomers. Peak numbers correspond to monomers listed in Table 2 (cutin monomers) and Table 3 (suberin monomers). Internal standard (IS): 17:0 fatty acid methyl ester (IS1) and 15-hydroxy 15:0 fatty acid methyl ester (IS2). Asterisks indicate peaks of residual unsaturated fatty acids from membranes, not considered part of the polyester.
Fig. 2 in Extracellular lipids of Camelina sativa: Characterization of cutin and suberin reveals typical polyester monomers and unusual dicarboxylic fatty acids
Fig. 2. Suberin deposition in roots and seed coats of Camelina sativa. Root cross sections showing suberized root periderm stained with Sudan Red (A) or viewed via blue-yellow suberin autofluorescence (B). Transmission electron microscopy (TEM) image of root endodermis (C) and TEM image of root periderm (D). TEM image of seed coat showing suberized palisade cell walls (E, F). Scale bars: 100 μm (A, B), 100 nm (C, D), 5 μm (E), and 500 nm (F). CW, cell wall; P, palisade layer; S, suberin.
Fig. 1 in Extracellular lipids of Camelina sativa: Characterization of cutin and suberin reveals typical polyester monomers and unusual dicarboxylic fatty acids
Fig. 1. Ultrastructure of Camelina sativa cuticles. Transmission electron microscopy images of cross-sections of adaxial (A) and abaxial (B) leaves, and top (C) and bottom (D) stems. Scanning electron microscopy images of adaxial (E) and abaxial (F) petal surfaces. Scale bars: 500 nm (A), 200 nm (B, C, D), and 10 μm (E, F). C, cuticle; CW, cell wall.
Fig. 4 in Extracellular lipids of Camelina sativa: Characterization of cutin and suberin reveals typical polyester monomers and unusual dicarboxylic fatty acids
Fig. 4. Lipid polyester monomer distribution in seed tissues. Comparison of transmethylation products from whole seeds, embryo-enriched and seed coatenriched delipidated residues. (A) Relative content of cutin monomer classes. (B–G) Detailed seed coat, embryo and whole seed monomer composition in each component class, namely hydroxy fatty acids (HFA; B), 1,ω-Diols (C), primary alcohols (PA; D), dicarboxylic acids (DCA; E) and hydroxycinnamic acids (HCA; F). Error bars represent SE; n =3. Fatty acids did not present any particular distribution between seed tissues and are not included in this figure.
A Prospective Observational Study on the Use of a Self Fixating Lightweight Polyester Mesh in Open Inguinal Hernia
ClinicalTrials.gov study NCT01421602. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Pilot Study to Asses the Function and Patency of Polyester-Coated Composite Bypasses From Autologous Varicose Veins
ClinicalTrials.gov study NCT00460291. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Biobased Polyester Versus Synthetic Fiberglass Casts for Treating Stable Upper Limb Fractures in Children
ClinicalTrials.gov study NCT06102603. IPD Sharing: YES. Countries: 1. Publications: 1.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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)
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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.