keyword
MENU ▼
Read by QxMD icon Read
search

Core Stabilization

keyword
https://www.readbyqxmd.com/read/28527991/lignosulfonate-stabilized-selenium-nanoparticles-and-their-deposition-on-spherical-silica
#1
Anna Modrzejewska-Sikorska, Emilia Konował, Łukasz Klapiszewski, Grzegorz Nowaczyk, Stefan Jurga, Teofil Jesionowski, Grzegorz Milczarek
We report a novel room-temperature synthesis of selenium nanoparticles, which for the first time uses lignosulfonate as a stabilizer. Various lignosulfonates obtained both from hardwood and softwood were tested. Selenium oxide was used as the precursor of zero-valent selenium. Three different reducers were tested - sodium borohydride, hydrazine and ascorbic acid - and the latter proved most effective in terms of the particle size and stability of the final colloid. The lignosulfonate-stabilized selenium nanoparticles had a negative zeta potential, dependent on pH, which for some lignosulfonates reached -50mV, indicating the excellent stability of the colloid...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28525395/the-shell-effect-on-the-room-temperature-photoluminescence-from-zno-mgo-core-shell-nanowires-exciton-phonon-coupling-and-strain
#2
Nadia Vega, Oscar Marin, Ezequiel Tosi, Gustavo Grinblat, Edgar Mosquera, M Moreno, Mónica Tirado, D Comedi
The room temperature photoluminescence (PL) from ZnO/MgO core/shell nanowires (NWs) grown by a simple two-step vapour transport method was studied for various MgO shell widths (w). Two distinct effects induced by the MgO shell were clearly identified. The first one, related to the ZnO/MgO interface formation, is evidenced by strong enhancements of the zero-phonon and first phonon replica of the excitonic emission, which are accompanied by a total suppression of its second phonon replica. This effect can be explained by the reduction of the band bending within the ZnO NW core that follows the removal of atmospheric adsorbates and associated surface traps during the MgO growth process on one hand, and a reduced exciton-phonon coupling as a result of the mechanical stabilization of the outermost ZnO NW monolayers by the MgO shell on the other hand...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28524649/synthesis-and-stabilization-of-colloidal-perovskite-nanocrystals-by-multidentate-polymer-micelles
#3
Shaocong Hou, Yuzheng Guo, Yuguo Tang, Qimin Quan
Lead halide perovskites have emerged as low-cost, high-performance optical and optoelectronic materials, however, their material stability has been a limiting factor for broad applications. Here, we demonstrate stable core-shell colloidal perovskite nanocrystals using a novel, facile and low-cost co-polymer templated synthesis approach. The block co-polymer serves as a confined nano-reactor during perovskite crystallization and passivates the perovskite surface by forming a multidentate capping shell, thus significantly improving its photo-stability in polar solvents...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524376/fluorinated-peg-polypeptide-polyplex-micelles-have-good-serum-resistance-and-low-cytotoxicity-for-gene-delivery
#4
Ting Wu, Longhai Wang, Shenggang Ding, Yezi You
A novel PEGylation polypeptide, poly(ethylene glycol)-b-poly(l-lysine)-b-poly(l-cysteine) (PEG-PLL-PCys) triblock copolymer is synthesized via the sequential ring-opening polymerization of amino acid N-carboxyanhydrides initiated by methoxypolyethylene glycol amine (mPEG-NH2 , Mw is 2 kDa). Subsequently, the obtained polypeptide is partially conjugated with fluorocarbon chains via disulfide exchange reaction. PLL segment can condense plasmid DNA through an electrostatic force to form a complex core, PEG segment surrounding the complex like a corona can prevent the complex from precipitation and reduce the adsorption of serum, while PCys segment with fluorocarbon can enhance the cellular uptake and the stability of the formed polyplex micelles in physiological conditions...
May 19, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28523617/one-pot-synthesis-of-lightly-doped-zn1-x-cu-x-o-and-au-zn1-x-cu-x-o-with-solar-light-photocatalytic-activity-in-liquid-phase
#5
Anis Fkiri, Marisa Rico Santacruz, Amine Mezni, Leila-Samia Smiri, Valérie Keller, Nicolas Keller
We report on the facile and low-temperature one-pot chemical synthesis of lightly doped Zn1-x Cu x O and hybrid Au-Zn1-x Cu x O photocatalysts with low Cu molar content (0 < x < 0.7%) using 1,3-propanediol polyol simultaneously as solvent, reducing and a stabilizing agent, without any final thermal treatment. The photocatalysts have been characterized by X-ray diffraction, N2 adsorption study, UV-vis diffuse reflectance spectroscopy, inductively coupled plasma optical emission spectroscopy, and transmission electron microscopy...
May 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28522809/nickel-cobalt-sulfide-core-shell-structure-on-3d-graphene-for-supercapacitor-application
#6
Lemu Girma Beka, Xin Li, Weihua Liu
Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3-x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521100/single-step-synthesis-of-small-azide-functionalized-gold-nanoparticles-versatile-water-dispersible-reagents-for-click-chemistry
#7
Edward W Elliott, Aurora L Ginzburg, Zachary C Kennedy, Zhenshuo Feng, James E Hutchison
Nanoparticles possessing functional groups that can be readily conjugated (e.g. through click chemistry) are important precursors for the preparation of customized nanohybrid products. Such nanoparticles, if they are stable against agglomeration, are easily dispersible and have well-defined surface chemistry and size. As click-ready reagents, they can be stored until their time of use and then simply dispersed and reacted with an appropriate substrate. Gold nanoparticles (AuNPs) are excellent candidates for this purpose and some clickable gold nanoparticles have been developed; however, AuNPs for use in aqueous systems are often prepared through difficult multistep processes and/or can be poorly dispersible in water...
May 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28520475/kombucha-multimicrobial-community-under-simulated-spaceflight-and-martian-conditions
#8
O Podolich, I Zaets, O Kukharenko, I Orlovska, O Reva, L Khirunenko, M Sosnin, A Haidak, S Shpylova, E Rabbow, M Skoryk, M Kremenskoy, R Demets, N Kozyrovska, J-P de Vera
Kombucha microbial community (KMC) produces a cellulose-based biopolymer of industrial importance and a probiotic beverage. KMC-derived cellulose-based pellicle film is known as a highly adaptive microbial macrocolony-a stratified community of prokaryotes and eukaryotes. In the framework of the multipurpose international astrobiological project "BIOlogy and Mars Experiment (BIOMEX)," which aims to study the vitality of prokaryotic and eukaryotic organisms and the stability of selected biomarkers in low Earth orbit and in a Mars-like environment, a cellulose polymer structural integrity will be assessed as a biomarker and biotechnological nanomaterial...
May 2017: Astrobiology
https://www.readbyqxmd.com/read/28517241/dopant-free-hole-transport-materials-based-on-methoxytriphenylamine-substituted-indacenodithienothiophene-for-solution-processed-perovskite-solar-cells
#9
Xiaoyuan Liu, Xiaolu Zheng, Yulong Wang, Zhiliang Chen, Fang Yao, Qi Zhang, Guojia Fang, Zhi-Kuan Chen, Wei Huang, ZongXiang Xu
Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high performance perovskite solar cells (PSCs). The highest efficiency PSCs use organic HTMs, many of which have low mobilities and so require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two novel HTMs (IDT-TPA and IDTT-TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron donating methoxytriphenylamine (TPA) groups as the end-capping units...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28516844/clues-for-two-step-virion-infectivity-factor-regulation-by-core-binding-factor-beta
#10
Youwei Ai, Jianzhang Ma, Xiaojun Wang
Lentiviruses threaten human and animal health. Virion infectivity factor (Vif) is essential for the infectivity of most lentiviruses, except for the equine infectious anaemia virus (EIAV). Vif promotes viral infectivity by recruiting a Cullin-based E3 ligase to induce the degradation of a class of host restriction factors, named APOBEC3. Core binding factor beta (CBF-β) is necessary for several primate lentiviral Vif functions, including HIV-1 Vif. Although much progress has been made in understanding the contribution of CBF-β to Vif function, the precise mechanism has not yet been fully elucidated...
May 18, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28516782/exploring-site-specific-n-glycosylation-of-hek293-and-plant-produced-human-iga-isotypes
#11
Kathrin Göritzer, Daniel Maresch, Friedrich Altmann, Christian Obinger, Richard Strasser
The full potential of recombinant Immunoglobulin A as therapeutic antibody is not fully explored, owing to the fact that structure-function relationships of these extensively glycosylated proteins are not well understood. Here, monomeric IgA1, IgA2m(1) and IgA2m(2) variants of the anti-HER2 antibody (IgG1) trastuzumab were expressed in glyco-engineered Nicotiana benthamiana plants and in human HEK293-6E cells. All three IgA isotypes were purified and subjected to biophysical and biochemical characterization...
May 18, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28515971/prediction-of-functional-movement-screen%C3%A2-performance-from-lower-extremity-range-of-motion-and-core-tests
#12
Nicole J Chimera, Shelby Knoeller, Ron Cooper, Nicholas Kothe, Craig Smith, Meghan Warren
BACKGROUND: There are varied reports in the literature regarding the association of the Functional Movement Screen™ (FMS™) with injury. The FMS™ has been correlated with hamstring range of motion and plank hold times; however, limited research is available on the predictability of lower extremity range of motion (ROM) and core function on FMS™ performance. PURPOSE/HYPOTHESES: The purpose of this study was to examine whether active lower extremity ROM measurements and core functional tests predict FMS™ performance...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28514592/soft-skyrmions-spontaneous-valence-and-selection-rules-in-nanoparticle-superlattices
#13
Alex Travesset
A number of bewildering paradoxes arise in the field of nanoparticle self-assembly: nominal low density superlattices, strong stability of low coordination sites and a clear but imperfect correlation between lattice stability and the maximum of hard sphere packing, despite that nanocrystals themselves are, through their ligands, very much compressible. In this study, I show that by regarding nanocrystals as pseudo-topological objects(``soft skyrmions''), it is possible to identify and classify the ligand textures that determine their bonding...
May 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28513715/heterogeneous-cu-pd-binary-interface-boosts-stability-and-mass-activity-of-atomic-pt-clusters-in-the-oxygen-reduction-reaction
#14
Hsin-Yi Tiffany Chen, Jyh-Pin Chou, Cheng-Yang Lin, Chih-Wei Hu, Ya-Tang Yang, Tsan-Yao Chen
A ternary metallic CuPdPt nanocatalyst (NC) is synthesized using a wet chemical reduction method, which is sequentially designed, in the presence of acid treated carbon nanotubes. This NC is a nanocrystal with a configuration of a Cu@Pd core and atomic Pt clusters (∼9 wt%) on the top (Cu@Pd/Pt). A residual current of 92.6%, 5.2 times higher than that of commercial Pt catalysts (at 0.85 V vs. RHE), is retained after 40 000 cycles of an accelerated degradation test (ADT). Atomic and electronic structure analyses show that such exclusive stability mainly results from electron localization at Pt clusters in heterogeneous interfaces of the Cu-Pd core...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28513602/tetrahelical-structural-family-adopted-by-agcga-rich-regulatory-dna-regions
#15
Vojč Kocman, Janez Plavec
Here we describe AGCGA-quadruplexes, an unexpected addition to the well-known tetrahelical families, G-quadruplexes and i-motifs, that have been a focus of intense research due to their potential biological impact in G- and C-rich DNA regions, respectively. High-resolution structures determined by solution-state nuclear magnetic resonance (NMR) spectroscopy demonstrate that AGCGA-quadruplexes comprise four 5'-AGCGA-3' tracts and are stabilized by G-A and G-C base pairs forming GAGA- and GCGC-quartets, respectively...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28513474/dielectric-analysis-based-on-spherical-shell-model-for-cationic-and-anionic-spherical-polyelectrolyte-brushes
#16
Xiaoxia Guo, Kongshuang Zhao
We report here a dielectric study on cationic and anionic spherical polyelectrolyte brushes (SPBs) (consisting of a polystyrene (PS) core and poly (2-aminoethylmethacrylate hydrochloride (PAEMH) chains or poly (acrylic acid) (PAA) chains grafted onto the core) suspensions over a frequency range of 40 Hz to 110 MHz. The relaxation behavior of the suspensions shows significant changes in the brush layer properties when changing particles mass fraction or pH of system. After eliminating electrode polarization effect at low frequency, two definite relaxations related to the interfacial polarization, around 100 kHz and 10 MHz respectively, are observed...
May 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28512317/structural-determinants-of-neosartorya-fischeri-antifungal-protein-nfap-for-folding-stability-and-antifungal-activity
#17
László Galgóczy, Attila Borics, Máté Virágh, Hargita Ficze, Györgyi Váradi, Zoltán Kele, Florentine Marx
The recent global challenges to prevent and treat fungal infections strongly demand for the development of new antifungal strategies. The structurally very similar cysteine-rich antifungal proteins from ascomycetes provide a feasible basis for designing new antifungal molecules. The main structural elements responsible for folding, stability and antifungal activity are not fully understood, although this is an essential prerequisite for rational protein design. In this study, we used the Neosartorya fischeri antifungal protein (NFAP) to investigate the role of the disulphide bridges, the hydrophobic core, and the N-terminal amino acids in the formation of a highly stable, folded, and antifungal active protein...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28512095/structure-based-mutations-in-the-herpes-simplex-virus-1-glycoprotein-b-ectodomain-arm-impart-a-slow-entry-phenotype
#18
Qing Fan, Sarah J Kopp, Sarah A Connolly, Richard Longnecker
Glycoprotein B (gB) is the conserved herpesvirus fusion protein, and it is required for the entry of herpesviruses. The structure of the postfusion conformation of gB has been solved for several herpesviruses; however, the gB prefusion crystal structure and the details of how the protein refolds from a prefusion to a postfusion form to mediate fusion have not been determined. Using structure-based mutagenesis, we previously reported that three mutations (I671A, H681A, and F683A) in the C-terminal arm of the gB ectodomain greatly reduced cell-cell fusion...
May 16, 2017: MBio
https://www.readbyqxmd.com/read/28509533/a-low-cost-label-free-biosensing-bimetallic-cellulose-strip-with-silar-synthesized-silver-core-gold-shell-nanoparticle-structures
#19
Wansun Kim, Jae-Chul Lee, Gi-Ja Lee, Hun-Kuk Park, Anbok Lee, Samjin Choi
We introduce a label-free biosensing cellulose strip sensor with surface-enhanced Raman spectroscopy (SERS)-encoded bimetallic core@shell nanoparticles. Bimetallic nanoparticles consisting of a synthesis of core Ag nanoparticles (AgNP) and a synthesis of shell gold nanoparticles (AuNPs) were fabricated on a cellulose substrate by two-stage successive ionic layer absorption and reaction (SILAR) techniques. The bimetallic nanoparticle-enhanced localized surface plasmon resonance (LSPR) effects were theoretically verified by computational calculations with finite element models of optimized bimetallic nanoparticles interacting with an incident laser source...
May 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28508482/solving-efficiently-large-single-step-genomic-best-linear-unbiased-prediction-models
#20
I Strandén, K Matilainen, G P Aamand, E A Mäntysaari
Single-step genomic BLUP (ssGBLUP) requires a dense matrix of the size equal to the number of genotyped animals in the coefficient matrix of mixed model equations (MME). When the number of genotyped animals is high, solving time of MME will be dominated by this matrix. The matrix is the difference of two inverse relationship matrices: genomic (G) and pedigree (A22 ). Different approaches were used to ease computations, reduce computing time and improve numerical stability. Inverse of A22 can be computed as A22-1=A22-A21A11-1A12 where A(ij) , i, j = 1,2, are sparse sub-matrices of A(-1) , and numbers 1 and 2 refer to non-genotyped and genotyped animals, respectively...
June 2017: Journal of Animal Breeding and Genetics, Zeitschrift Für Tierzüchtung und Züchtungsbiologie
keyword
keyword
25616
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"