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https://www.readbyqxmd.com/read/28719875/novel-magnetic-carboxyl-modified-hypercrosslinked-resins-for-effective-removal-of-typical-ppcps
#1
Jing Jin, Tianyu Feng, Yan Ma, Wei Wang, Yunshu Wang, Qing Zhou, Aimin Li
A series of novel magnetic carboxyl modified hypercrosslinked resins were successfully prepared via a sequence of suspension polymerization, hydrolysis and post-crosslinking reactions. The serial resins possessed both high cation exchange capacity and high specific surface area with MA-10 having the supreme specific surface area of 1238.65 m(2)/g and MA-70 having the largest exchange capacity of 6.45 mmol/g. The serial resins exhibited excellent adsorption capacity of typical PPCPs including chloramphenicol, atenolol, ibuprofen and tetracycline, which were neutral, cationic, anionic and zwitterionic respectively in natural water...
July 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28719648/oligo-ethylene-glycol-sidechain-microgels-prepared-in-absence-of-cross-linking-agent-polymerization-characterization-and-variation-of-particle-deformability
#2
Nicole Welsch, L Andrew Lyon
We present a systematic study of self-cross-linked microgels formed by precipitation polymerization of oligo ethylene glycol methacrylates. The cross-linking density of these microgels and, thus, the network flexibility can be easily tuned through the modulation of the reaction temperature during polymerization. Microgels prepared in absence of any difunctional monomer, i.e. cross-linker, show enhanced deformability and particle spreading on solid surfaces as compared to microgels cross-linked with varying amounts of poly(ethylene glycol diacrylate) (PEG-DA) in addition to self-crosslinking...
2017: PloS One
https://www.readbyqxmd.com/read/28715736/highly-effective-cs-removal-by-turbidity-free-potassium-copper-hexacyanoferrate-immobilized-magnetic-hydrogels
#3
Yun Kon Kim, Taegeon Kim, Yonghwan Kim, David Harbottle, Jae W Lee
Potassium copper hexacyanoferrate-immobilized magnetic hydrogel (MHPVA) has been synthesized via a facile freeze/thaw crosslinking method. The citric acid coated Fe3O4 is embedded into the hydrogel matrix to facilitate the dispersion of nano-sized KCuHCF particles for Cs(+) removal, followed by the rapid recovery of the composite in a magnetic field. The Cs(+) adsorption behavior of the MHPVA is fitted well with the Langmuir isotherm and the pseudo-second-order kinetic model. The MHPVA exhibits both high Cs(+) adsorption capacity (82...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28715397/magnetic-and-thermal-sensitive-poly-n-isopropylacrylamide-based-microgels-for-magnetically-triggered-controlled-release
#4
Chih-Yu Kuo, Ting-Yu Liu, Kuan-Syun Wang, Andri Hardiansyah, Yen-Ting Lin, Hsueh-Yung Chen, Wen-Yen Chiu
Magnetically and thermally sensitive poly(N-isopropylacrylamide) (PNIPAAm)/Fe3O4-NH2 microgels with the encapsulated anti-cancer drug curcumin (Cur) were designed and fabricated for magnetically triggered release. PNIPAAm-based magnetic microgels with a spherical structure were produced via a temperature-induced emulsion followed with physical-crosslinking by mixing PNIPAAm, polyethylenimine (PEI), and Fe3O4-NH2 magnetic nanoparticles. Because of their dispersity, the Fe3O4-NH2 nanoparticles were embedded inside the polymer matrix...
July 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715200/unraveling-the-single-nanometer-thickness-of-shells-of-vesicle-templated-polymer-nanocapsules
#5
Andrew George Richter, Sergey A Dergunov, Mariya D Kim, Sergey N Shmakov, Sai Venkatesh Pingali, Volker S Urban, Yun Liu, Eugene Pinkhassik
The recent emergence of vesicle-templated nanocapsules as a viable platform for diverse applications has heightened the need for detailed structural characterization of nanocapsule shells and for better understanding of surfactant-mediated directed assembly of nanomaterials. Information on the thickness is a critical structural parameter of nanocapsules, where the shell plays a crucial role providing mechanical stability and control of permeability. Here we used small-angle neutron scattering (SANS) to determine the thickness of freestanding and surfactant-stabilized nanocapsules...
July 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28715195/thermo-mechanical-response-of-self-assembled-nanoparticle-membranes
#6
Yifan Wang, Henry Chan, Badri Narayanan, Sean P McBride, Subramanian K R S Sankaranarayanan, Xiao-Min Lin, Heinrich Martin Jaeger
Monolayers composed of colloidal nanoparticles, with a thickness of less than ten nanometers, have remarkable mechanical moduli and can suspend over micron-sized holes to form free-standing membranes. In this paper, we discuss experiments and coarse-grained molecular dynamics simulations characterizing the thermo-mechanical properties of these self-assembled nanoparticle membranes. These membranes remain strong and resilient up to temperatures much higher than previous simulation predictions, and exhibit an unexpected hysteretic behavior during the first heating-cooling cycle...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715015/ultralight-highly-thermally-insulating-and-fire-resistant-aerogel-by-encapsulating-cellulose-nanofibers-with-two-dimensional-mos2
#7
Lei Yang, Alolika Mukhopadhyay, Yucong Jiao, Qiang Yong, Liao Chen, Yingjie Xing, Jonathan Hamel, Hongli Zhu
Thermally insulating materials, made from earth-abundant and sustainable resources, are highly desirable in the sustainable construction of energy efficient buildings. Cellulose from wood has long been recognized for these characteristics. However, cellulose can be a flammability hazard, and for construction this has been addressed via chemical treatment such as that with halogen and/or phosphorus, which leads to further environmental concerns. Fortunately, the structure of cellulose lends itself well to chemical modification, giving great potential to explore interaction with other compounds...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28714685/adsorption-coupled-diffusion-of-gold-nanoclusters-within-a-large-pore-protein-crystal-scaffold
#8
Luke F Hartje, Brian E Munsky, Thomas W Ni, Christopher J Ackerson, Christopher D Snow
Large-pore protein crystals (LPCs) are ordered biologically-derived nanoporous materials exhibiting pore diameters greater than 8 nm. These substantial pores distinguish LPCs from typical nanoporous scaffolds; enabling engineered LPC materials to readily uptake, immobilize, and release macromolecular guests. In this study, macromolecular transport within an LPC environment has been experimentally and computationally investigated by studying adsorption-coupled diffusion of Au25(glutathione)18 nanoclusters within a crosslinked LPC scaffold via time-lapse confocal microscopy, bulk equilibrium adsorption, and hindered diffusion simulation...
July 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28714308/supersensitive-oxidation-responsive-biodegradable-peg-hydrogels-for-glucose-triggered-insulin-delivery
#9
Mei Zhang, Cheng-Cheng Song, Fu-Sheng Du, Zi-Chen Li
Reactive oxygen species (ROS)-responsive polymers and hydrogels represent an emerging family of intelligent materials owing to the key functions of ROS in physiological processes or pathological diseases. Nonetheless, the weaknesses such as low sensitivity, slow response, instability, or low mechanical strength are associated with the limited ROS-responsive polymeric or supramolecular hydrogels. In this study, a novel type of oxidation-responsive degradable hydrogels was fabricated by the redox initiated radical polymerization of a 4-arm-PEG acrylic macromonomer that possesses an H2O2-cleavable phenylboronic acid linker in each of the arms...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714295/one-step-cationic-grafting-of-4-hydroxy-tempo-and-its-application-in-a-hybrid-redox-flow-battery-with-a-crosslinked-pbi-membrane
#10
Zhenjun Chang, Dirk Henkensmeier, Ruiyong Chen
By using a one-step epoxide ring-opening reaction between 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4-hydroxy-TEMPO) and glycidyltrimethylammonium cation (GTMA+), we synthesize a cation-grafted TEMPO (g+-TEMPO) and study its electrochemical performance against a Zn2+/Zn anode in a hybrid redox flow battery. To conduct Cl- counter anions, a crosslinked methylated polybenzimidazole (PBI) membrane was prepared and placed between the catholyte and anolyte. Compared to 4-hydroxy-TEMPO, the positively charged g+-TEMPO exhibits enhanced reaction kinetics...
July 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28714234/an-improved-correlation-to-predict-molecular-weight-between-crosslinks-based-on-equilibrium-degree-of-swelling-of-hydrogel-networks
#11
Andrea C Jimenez-Vergara, John Lewis, Mariah S Hahn, Dany J Munoz-Pinto
Accurate characterization of hydrogel diffusional properties is of substantial importance for a range of biotechnological applications. The diffusional capacity of hydrogels has commonly been estimated using the average molecular weight between crosslinks (Mc ), which is calculated based on the equilibrium degree of swelling. However, the existing correlation linking Mc and equilibrium swelling fails to accurately reflect the diffusional properties of highly crosslinked hydrogel networks. Also, as demonstrated herein, the current model fails to accurately predict the diffusional properties of hydrogels when polymer concentration and molecular weight are varied simultaneously...
July 17, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28714117/a-swellable-microneedle-patch-to-rapidly-extract-skin-interstitial-fluid-for-timely-metabolic-analysis
#12
Hao Chang, Mengjia Zheng, Xiaojun Yu, Aung Than, Razina Z Seeni, Rongjie Kang, Jingqi Tian, Duong Phan Khanh, Linbo Liu, Peng Chen, Chenjie Xu
Skin interstitial fluid (ISF) is an emerging source of biomarkers for disease diagnosis and prognosis. Microneedle (MN) patch has been identified as an ideal platform to extract ISF from the skin due to its pain-free and easy-to-administrated properties. However, long sampling time is still a serious problem which impedes timely metabolic analysis. In this study, a swellable MN patch that can rapidly extract ISF is developed. The MN patch is made of methacrylated hyaluronic acid (MeHA) and further crosslinked through UV irradiation...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713408/transcriptome-analyses-shed-new-insights-into-primary-metabolism-and-regulation-of-blumeria-graminis-f-sp-tritici-during-conidiation
#13
Fan-Song Zeng, Fabrizio Menardo, Min-Feng Xue, Xue-Jiang Zhang, Shuang-Jun Gong, Li-Jun Yang, Wen-Qi Shi, Da-Zhao Yu
Conidia of the obligate biotrophic fungal pathogen Blumeria graminis f. sp. tritici (Bgt) play a vital role in its survival and rapid dispersal. However, little is known about the genetic basis for its asexual reproduction. To uncover the primary metabolic and regulatory events during conidiation, we sequenced the transcriptome of Bgt epiphytic structures at 3 (vegetative hyphae growth), 4 (foot cells initiation), and 5 (conidiophore erection) days post-inoculation (dpi). RNA-seq analyses identified 556 and 404 (combined 685) differentially expressed genes (DEGs) at 4 and 5 dpi compared with their expression levels at 3 dpi, respectively...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28710838/enzyme-free-ligation-of-5-phosphorylated-oligodeoxynucleotides-in-a-dna-nanostructure
#14
Markus Kramer, Clemens Richert
Multicomponent reactions are difficult synthetic transformations. For DNA, there is a special opportunity to align multiple strands in a folded nanostructure, so that they are preorganized to give a specific sequence. Multistrand reactions in DNA origami structures have previously been performed using photochemical crosslinking, 1,3-diploar cycloadditions or phosphoramidate-forming reactions. Here we report carbodiimide-driven phosphodiester formation in a small origami sheet that produces DNA strands up to 600 nucleotides in length in a single step...
July 15, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28710492/nek1-kinase-domain-structure-and-its-dynamic-protein-interactome-after-exposure-to-cisplatin
#15
Talita D Melo-Hanchuk, Priscila Ferreira Slepicka, Gabriela Vaz Meirelles, Fernanda Luisa Basei, Diogo Ventura Lovato, Daniela Campos Granato, Bianca Alves Pauletti, Romenia Ramos Domingues, Adriana Franco Paes Leme, Alessandra Luiza Pelegrini, Guido Lenz, Stefan Knapp, Jonathan M Elkins, Jörg Kobarg
NEK family kinases are serine/threonine kinases that have been functionally implicated in the regulation of the disjunction of the centrosome, the assembly of the mitotic spindle, the function of the primary cilium and the DNA damage response. NEK1 shows pleiotropic functions and has been found to be mutated in cancer cells, ciliopathies such as the polycystic kidney disease, as well as in the genetic diseases short-rib thoracic dysplasia, Mohr-syndrome and amyotrophic lateral sclerosis. NEK1 is essential for the ionizing radiation DNA damage response and priming of the ATR kinase and of Rad54 through phosphorylation...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710009/mrna-interactome-capture-in-mammalian-cells
#16
Nicolai Kastelic, Markus Landthaler
Throughout their entire life cycle, mRNAs are associated with RNA-binding proteins (RBPs), forming ribonucleoprotein (RNP) complexes with highly dynamic compositions. Their interplay is one key to control gene regulatory mechanisms from mRNA synthesis to decay. To assay the global scope of RNA-protein interactions, we and others have published a method combining crosslinking with highly stringent oligo(dT) affinity purification to enrich proteins associated with polyadenylated RNA (poly(A)+ RNA). Identification of the poly(A)+ RNA-bound proteome (also: mRNA interactome capture) has by now been applied to a diversity of cell lines and model organisms, uncovering comprehensive repertoires of RBPs and hundreds of novel RBP candidates...
July 11, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28708377/membrane-association-dictates-ligand-specificity-for-the-innate-immune-receptor-nod2
#17
Amy K Schaefer, James E Melnyk, Michael Baksh, Klare M Lazor, M G Finn, Catherine Leimkuhler Grimes
The human gut must regulate its immune response to resident and pathogenic bacteria, numbering in the trillions. The peptidoglycan component of the bacterial cell wall is a dense and rigid structure that consists of polymeric carbohydrates and highly crosslinked peptides which offers protection from the host and surrounding environment. Nucleotide-binding oligomerization domain-containing protein 2 (NOD2), a human membrane-associated innate immune receptor found in the gut epithelium and mutated in an estimated 30% of Crohn's disease patients, binds to peptidoglycan fragments and initiates an immune response...
July 14, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28707514/removal-of-estrone-17%C3%AE-estradiol-and-estriol-from-sewage-and-cow-dung-by-immobilized-novosphingobium-sp-ari-1
#18
Juan Liu, Shunyao Li, Xin Li, Yanzheng Gao, Wanting Ling
Immobilized bacterial agents (IBA) can increase the cell density and improve the environmental adaptability of bacteria, as well as reduce competition by indigenous microorganisms and enhances the biodegradation of contaminants in complex matrices. An estrogen-degrading bacterium, Novosphingobium sp. ARI-1, was immobilized in calcium alginate (CA) using an embedding method and applied to the removal of estrogens from natural sewage and cow dung. The optimum immobilization conditions were as follows: sodium alginate (SA) and CaCl2·2H2O concentrations of 5% (m/v) and 4% (m/v), respectively; a bacterial suspension to sodium alginate ratio of 1:2; and crosslinking for 6 h at 4°C...
July 14, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28707465/ultra-stretchable-and-self-healing-double-network-hydrogel-for-3d-printing-and-strain-sensor
#19
Sijun Liu, Lin Li
On the basis of the thermoreversible sol-gel transition behavior of κ-carrageenan in water, a double network (DN) hydrogel has been fabricated by combining an ionically crosslinked κ-carrageenan network with a covalently crosslinked polyacrylamide (PAAm) network. The κ-carrageenan/PAAm DN hydrogel demonstrated the excellent recoverability and significant self-healing capability (even when notched). More importantly, the warm pre-gel solution of κ-carrageenan/AAm is able to be used as an ink of a 3D printer to print complex 3D structures with remarkable mechanical strength after UV-exposure...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28705682/increased-bone-matrix-mineralization-in-treatment-na%C3%A3-ve-children-with-inflammatory-bowel-disease
#20
Barbara M Misof, Paul Roschger, Klaus Klaushofer, Frank Rauch, Jinhui Ma, David R Mack, Leanne M Ward
Inflammatory bowel disease (IBD) affects many organ systems including the skeleton. In children with IBD, bone mineral density (BMD) and bone turnover are frequently low. Disturbances in bone mineralization density distribution (BMDD) are linked to alterations in bone material strength; however, BMDD has not previously been reported in children with chronic inflammatory disorders. The aim of this study was to characterize BMDD based on quantitative backscatter electron imaging in cancellous (Cn.) and cortical (Ct...
July 10, 2017: Bone
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