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https://www.readbyqxmd.com/read/29149729/functionalized-gold-nanoparticles-as-affinity-nanoprobes-for-multiple-lectins
#1
Karuppuchamy Selvaprakash, Yu-Chie Chen
Glycan-lectin interactions are commonly observed in nature. Analytical methods, which are used to detect lectins that rely on the use of glycan ligand-modified nanoprobes as affinity probes, have been developed. Most of the existing methods are focused on the use of synthetic glycan ligands. Nevertheless, naturally available glycoproteins, such as ovalbumin in chicken egg whites, are good sources for fabricating glycan-immobilized nanoprobes. In this study, we generated functionalized gold nanoparticles (Au NPs) from a one-pot reaction by reacting chicken egg white (cew) proteins with aqueous tetrachloroaurate...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149563/zein-nanoparticles-uptake-by-hydroponically-grown-soybean-plants
#2
Kurt Ristroph, Carlos E Astete, Ede Bodoki, Cristina M Sabliov
In the interest of developing and characterizing a polymeric nanoparticle pesticide delivery vehicle to soybeans, zein nanoparticle (ZNP) uptake by the roots and biodistribution to the leaves of soybean plants was measured. Zein was tagged with fluorescein isothiocyanate (FITC) and made into nanoparticles (135±3 nm diameter. 0.202±0.034 PDI and 81±4 mV zeta-potential at pH 6) using an emulsion-diffusion method. After ten days of hydroponic exposure, association between particles and roots of plants was found to vary based on bulk nanoparticle concentration...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29149472/which-commonly-monitored-chemical-contaminant-in-the-bohai-region-yangtze-and-pearl-rivers-of-china-poses-the-greatest-threat-to-aquatic-wildlife
#3
Andrew C Johnson, Monika D Jürgens, Chao Su, Meng Zhang, Yueqing Zhang, Yajuan Shi, Andrew Sweetman, Xiaowei Jin, Yonglong Lu
This study assessed the relative risk of 29 chemical contaminants to aquatic wildlife in the Bohai Region, Yangtze and Pearl Rivers of China. River monitoring data from 2010-2015 for metals, pesticides, plasticisers, surfactants, poly-aromatic hydrocarbons, flame retardants and ammonia were collected. For each chemical, ecotoxicity data were compiled for Chinese relevant aquatic species. The chemicals were ranked by relative risk either by comparing the ratios of the median river concentration divided by the median ecotoxicity concentration or the percentage of river measurements which exceeded the lower 10(th) percentile ecotoxicity value...
November 17, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29149039/growth-of-anisotropic-gold-nanoparticle-assemblies-via-liposome-fusion
#4
Kouta Sugikawa, Tatsuya Kadota, Kotaro Matsuo, Kazuma Yasuhara, Atsushi Ikeda
Anisotropic assembly of nanoparticles (NPs) has attracted extensive attention because of the potential applications in materials science, biology, and medicine. However, assembly control (e.g., the number of assembled NPs) has not been adequately studied. Here, the growth of anisotropic gold NP assemblies on a liposome surface is reported. Citrate-coated gold NPs adsorbed on liposome surfaces were assembled in one dimension at temperatures above the phase transition temperature of the lipid bilayer. Growth of the anisotropic assemblies depended on the heating time...
November 17, 2017: Materials
https://www.readbyqxmd.com/read/29148924/influence-of-gestational-diabetes-on-the-activity-of-%C3%AE-aminolevulinate-dehydratase-and-oxidative-stress-biomarkers
#5
Fabiane Rodrigues, Leidiane de Lucca, Walter S Neme, Thissiane de Lima Gonçalves
OBJECTIVES: This study aimed to evaluate the activity of delta-aminolevulinate dehydratase (δ-ALA-D) and oxidative stress biomarkers in pregnant women with gestational diabetes mellitus (GDM), in order to demonstrate the involvement of oxidative stress in this condition, which presents pathophysiology still undetermined. METHODS: δ-ALA-D activity, lipid peroxidation estimated as the levels of thiobarbituric acid reactive substances (TBARS), protein (P-SH) and non-protein thiol (NP-SH) content, catalase (CAT) activity and concentration of vitamin C (VIT C) in samples of pregnant women with GDM (n = 48) and in healthy pregnant women (n = 30), who constituted the control group...
November 17, 2017: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/29148790/solid-state-dewetting-of-gold-aggregates-islands-on-tio2-nanorod-structures-grown-by-oblique-angle-deposition
#6
Shizhao Liu, Joel Plawsky
A composite film made of a stable, gold nanoparticle (NP) array with well-controlled separation and size atop a TiO2 nanorod film was fabricated via the oblique angle deposition technique (OAD). The fabrication of the nanoparticle array is based on controlled, Rayleigh-instability-induced, solid-state dewetting of as-deposited gold aggregates on the TiO2 nanorods. It was found that the initial spacing between as-deposited gold aggregates along the vapor flux direction should be greater than the TiO2 inter-rod spacing created by 80° OAD in order to control the dewetting and produce NP arrays...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148789/amphiphilic-n-heterocyclic-carbene-stabilized-gold-nanoparticles-and-their-self-assembly-in-polar-solvents
#7
Mina R Narouz, Chien-Hung Li, Ali Nazemi, Cathleen M Crudden
Soft matter-directed self-assembly of amphiphilic inorganic nanoparticles (NPs) has recently emerged as a promising approach to access NP ensembles with superior collective properties. While thiol-terminated molecules are primarily employed to tether the amphiphilic ligand to the metal, serious concerns remain regarding the stabilities of the resulting NPs and their corresponding superstructures. As an alternative to such ligands, we report the first example of amphiphilic N-heterocyclic carbene (NHC)-functionalized gold nanoparticles (AuNPs)...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148719/effect-of-antigen-retrieval-methods-on-non-specific-binding-of-anti-body-metal-nanoparticle-conjugates-on-ffpe-tissue
#8
Yuying Zhang, Xinping Wang, Sven Perner, Ágnes Bánkfalvi, Sebastian Schlücker
Immunohistochemical analysis of FFPE tissues provides important diagnostic and prognostic information in pathology. Metal nanoparticles (NPs) and in particular surface-enhanced Raman scattering (SERS) nanotags as a new class of labelling reagents are promising to be used for multiplexed protein profiling on tissue sections. However, non-specific binding of NPs onto the tissue specimens greatly hampers their clinical applications. In this study, we found that the antigen retrieval method strongly influences the extent of non-specific binding of the antibody-SERS NP conjugates to the tissue...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148351/opioid-prescribing-by-nurse-practitioners-in-medicare-part-d-impact-of-state-scope-of-practice-legislation
#9
Elissa Ladd, Casey Fryer Sweeney, Anthony Guarino, Alex Hoyt
Many state legislatures restrict nurse practitioner (NP) scope of practice as a way of addressing patient safety concerns. The purpose of this study was to investigate the influence of state NP scope of practice laws on the prescription of oxycodone and hydrocodone containing medications by NP and MD/DO/PA prescribers to Medicare Part D beneficiaries. Using the Medicare Part D public use file, we analyzed oxycodone and hydrocodone containing prescriptions per Medicare Part D beneficiary by prescriber type, NP state scope of practice, and geographic variables...
August 1, 2017: Medical Care Research and Review: MCRR
https://www.readbyqxmd.com/read/29148253/quantification-of-vascular-damage-in-acute-kidney-injury-with-fluorine-magnetic-resonance-imaging-and-spectroscopy
#10
Jeremy K Moore, Junjie Chen, Hua Pan, Joseph P Gaut, Sanjay Jain, Samuel A Wickline
PURPOSE: To design a fluorine MRI/MR spectroscopy approach to quantify renal vascular damage after ischemia-reperfusion injury, and the therapeutic response to antithrombin nanoparticles (NPs) to protect kidney function. METHODS: A total of 53 rats underwent 45 min of bilateral renal artery occlusion and were treated at reperfusion with either plain perfluorocarbon NPs or NPs functionalized with a direct thrombin inhibitor (PPACK:phenyalanine-proline-arginine-chloromethylketone)...
November 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29148098/absence-or-mislocalization-of-dnah5-is-a-characteristic-marker-for-motile-ciliary-abnormality-in-nasal-polyps
#11
Qianhui Qiu, Yang Peng, Zhenchao Zhu, Zhuo Chen, Chi Zhang, Hsiao Hui Ong, Kai Sen Tan, Haiyu Hong, Yan Yan, Haoqi Huang, Jing Liu, Xianqing Li, H N Nam, N T N Dung, Li Shi, Qintai Yang, Colin D Bingle, De-Yun Wang
OBJECTIVE: Motile cilia impairment is a common condition in patients with chronically inflamed airways, such as is seen in nasal polyps (NPs). The mechanism underlying this pathogenic condition is complex and not fully understood. METHODS: We investigated the presence and localization of dynein axonemal heavy chain 5 (DNAH5) in motile cilia using immunofluorescence staining in paraffin-embedded nasal biopsies from NPs (n = 120) and inferior turbinate mucosa (n = 35) of healthy controls...
November 17, 2017: Laryngoscope
https://www.readbyqxmd.com/read/29147462/oxygen-sensing-nox4-generates-genotoxic-ros-to-induce-premature-senescence-of-nucleus-pulposus-cells-through-mapk-and-nf-%C3%AE%C2%BAb-pathways
#12
Chencheng Feng, Yang Zhang, Minghui Yang, Minghong Lan, Huan Liu, Bo Huang, Yue Zhou
Senescence is a crucial driver of intervertebral disc degeneration (IDD). Disc cells are exposed to high oxygen tension due to neovascularization in degenerative discs. However, the effect of oxygen tension on disc cell senescence was unknown. Herein, rat nucleus pulposus (NP) cells were cultured under 20% O2 or 1% O2. Consequently, ROS induced by 20% O2 caused DNA damage and then activated p53-p21-Rb and p16-Rb pathways via ERK signaling to induce NP cell senescence. It also induced catabolic and proinflammatory phenotype of NP cells via MAPK and NF-κB pathways...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29147108/muc1-aptamer-targeted-sers-nanoprobes
#13
Suchetan Pal, Stefan Harmsen, Anton Oseledchyk, Hsiao-Ting Hsu, Moritz F Kircher
Recently, surface-enhanced Raman scattering (SERS) nanoprobes (NPs) have shown promise in the field of cancer imaging due to their unparalleled signal specificity and high sensitivity. Here we report the development of a DNA aptamer targeted SERS NP. Recently, aptamers are being investigated as a viable alternative to more traditional antibody targeting due to their low immunogenicity and low cost of production. We developed a strategy to functionalize SERS NPs with DNA aptamers, which target Mucin1 (MUC1) in human breast cancer (BC)...
August 25, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/29146285/rapid-polymyxin-np-test-for-the-detection-of-polymyxin-resistance-mediated-by-the-mcr-1-mcr-2-genes
#14
Laurent Poirel, Yu Larpin, Jan Dobias, Roger Stephan, Jean-Winoc Decousser, Jean-Yves Madec, Patrice Nordmann
The Rapid Polymyxin NP test has been recently developed to rapidly detect polymyxin resistance in Enterobacteriaceae. Here we evaluated this test for detecting MCR-1/MCR-2-producing Enterobacteriaceae using a collection of 70 non-redundant strains either recovered from the environment, animals, or humans. Sensitivity and specificity were found to be 100%.
September 22, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29146245/repurposing-cationic-amphiphilic-drugs-as-adjuvants-to-induce-lysosomal-sirna-escape-in-nanogel-transfected-cells
#15
Freya Joris, Lynn De Backer, Thijs Van de Vyver, Chiara Bastiancich, Stefaan C De Smedt, Koen Raemdonck
Cytosolic delivery remains a major bottleneck for siRNA therapeutics. To facilitate delivery, siRNAs are often enclosed in nanoparticles (NPs). However, upon endocytosis such NPs are mainly trafficked towards lysosomes. To avoid degradation, cytosolic release of siRNA should occur prior to fusion of endosomes with lysosomes, but current endosomal escape strategies remain inefficient. In contrast to this paradigm, we aim to exploit lysosomal accumulation by treating NP-transfected cells with low molecular weight drugs that release the siRNA from the lysosomes into the cytosol...
November 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29146244/extending-antigen-release-from-particulate-vaccines-results-in-enhanced-antitumor-immune-response
#16
Chintan H Kapadia, Shaomin Tian, Jillian L Perry, David Sailer, J Christopher Luft, Joseph M DeSimone
Tumor-specific CD8(+) cytotoxic T lymphocytes (CTLs) play a critical role in an anti-tumor immune response. However, vaccination intended to elicit a potent CD8(+) T cell responses employing tumor-associated peptide antigens, are typically ineffective due to poor immunogenicity. Previously, we engineered a polyethylene glycol (PEG) hydrogel-based subunit vaccine for the delivery of an antigenic peptide and CpG (adjuvant) to elicit potent CTLs. In this study, we further examined the effect of antigen release kinetics on their induced immune responses...
November 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29146239/innately-activated-tlr4-signal-in-the-nucleus-accumbens-is-sustained-by-crf-amplification-loop-and-regulates-impulsivity
#17
Irina Balan, Kaitlin T Warnock, Adam Puche, Marjorie C Gondre-Lewis, Laure Aurelian
Cognitive impulsivity is a heritable trait believed to represent the behavior that defines the volition to initiate alcohol drinking. We have previously shown that a neuronal Toll-like receptor 4 (TLR4) signal located in the central amygdala (CeA) and ventral tegmental area (VTA) controls the initiation of binge drinking in alcohol-preferring P rats, and TLR4 expression is upregulated by alcohol-induced corticotropin-releasing factor (CRF) at these sites. However, the function of the TLR4 signal in the nucleus accumbens shell (NAc-shell), a site implicated in the control of reward, drug-seeking behavior and impulsivity and the contribution of other signal-associated genes, are still poorly understood...
November 13, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29145464/cellular-hnrnp-a2-b1-interacts-with-the-np-of-influenza-a-virus-and-impacts-viral-replication
#18
Cheng-Kai Chang, Chi-Jene Chen, Chih-Ching Wu, Shiau-Wen Chen, Shin-Ru Shih, Rei-Lin Kuo
The viral ribonucleoprotein (vRNP) of influenza A virus is formed by virion RNA (vRNA), viral polymerase complex, and nucleoprotein (NP). The NP plays an important role in facilitating the replication and stabilization of viral RNA. To explore host factors that may be involved in the regulation of viral replication through interactions with NP, we conducted an immunoprecipitation experiment followed by mass spectrometry to identify NP-associated cellular proteins. Here, we demonstrate that NP can interact and colocalize with heterogeneous nuclear ribonucleoprotein (hnRNP) A2/B1 in mammalian cells and that the interaction may occur via direct binding to the glycine-rich domain (GRD) of hnRNP A2/B1...
2017: PloS One
https://www.readbyqxmd.com/read/29144010/self-assembly-and-surface-patterning-of-polyferrocenylsilane-functionalized-gold-nanoparticles
#19
Rachelle M Choueiri, Anna Klinkova, Samuel Pearce, Ian Manners, Eugenia Kumacheva
Chemical and topographic surface patterning of inorganic polymer-functionalized nanoparticles (NPs) and their self-assembly in nanostructures with controllable architectures enable the design of new NP-based materials. Capping of NPs with inorganic polymer ligands, such as metallopolymers, can lead to new synergetic properties of individual NPs or their assemblies, and enhance NP processing in functional materials. Here, for gold NPs functionalized with polyferrocenylsilane, two distinct triggers are used to induce attraction between the polymer ligands and achieve NP self-assembly or topographic surface patterning of individual polymer-capped NPs...
November 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29143929/a-comparison-of-the-energetic-cost-of-running-in-marathon-racing-shoes
#20
Wouter Hoogkamer, Shalaya Kipp, Jesse H Frank, Emily M Farina, Geng Luo, Rodger Kram
BACKGROUND: Reducing the energetic cost of running seems the most feasible path to a sub-2-hour marathon. Footwear mass, cushioning, and bending stiffness each affect the energetic cost of running. Recently, prototype running shoes were developed that combine a new highly compliant and resilient midsole material with a stiff embedded plate. OBJECTIVE: The aim of this study was to determine if, and to what extent, these newly developed running shoes reduce the energetic cost of running compared with established marathon racing shoes...
November 16, 2017: Sports Medicine
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