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https://www.readbyqxmd.com/read/28524873/mesoporous-metallic-rhodium-nanoparticles
#1
Bo Jiang, Cuiling Li, Ömer Dag, Hideki Abe, Toshiaki Takei, Tsubasa Imai, Md Shahriar A Hossain, Md Tofazzal Islam, Kathleen Wood, Joel Henzie, Yusuke Yamauchi
Mesoporous noble metals are an emerging class of cutting-edge nanostructured catalysts due to their abundant exposed active sites and highly accessible surfaces. Although various noble metal (e.g. Pt, Pd and Au) structures have been synthesized by hard- and soft-templating methods, mesoporous rhodium (Rh) nanoparticles have never been generated via chemical reduction, in part due to the relatively high surface energy of rhodium (Rh) metal. Here we describe a simple, scalable route to generate mesoporous Rh by chemical reduction on polymeric micelle templates [poly(ethylene oxide)-b-poly(methyl methacrylate) (PEO-b-PMMA)]...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524727/e-cadherin-%C3%AE-catenin-complex-a-target-for-anticancer-and-antimetastasis-plants-plant-derived-compounds
#2
Majid Tafrihi, Roohollah Nakhaei Sistani
Plants reputed to have cancer-inhibiting potential and putative active components derived from those plants have emerged as an exciting new field in cancer study. Some of these compounds have cancer-inhibiting potential in different clinical staging levels, especially metastasis. A few of them which stabilize cell-cell adhesions are controversial topics. This review article introduces some effective herbal compounds that target E-cadherin/β-catenin protein complex. In this article, at first, we briefly review the structure and function of E-cadherin and β-catenin proteins, Wnt signaling pathway, and its target genes...
May 19, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28524656/multifunctional-and-redox-responsive-self-assembled-magnetic-nanovectors-for-protein-delivery-and-dual-modal-imaging
#3
Hong Yu Yang, Moon-Sun Jang, Yi Li, Jung Hee Lee, Doo Sung Lee
Nanoparticle (NP)-based model carriers present an emerging strategy for protein delivery. However, constructing a multifunctional nanocarrier with high loading capacity, diagnostic imaging capacity and controlled release capability is a tremendous challenge for protein delivery systems. Thus, we herein report on the fabrication of redox-responsive magnetic nanovectors (termed RMNs) through self- assembly of Fe3O4 NPs and redox-responsive polymer ligands, which could effectively transport protein and trigger intracellular protein release...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524649/synthesis-and-stabilization-of-colloidal-perovskite-nanocrystals-by-multidentate-polymer-micelles
#4
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/28524432/solution-nmr-structure-of-a-ligand-hybrid-2-g-quadruplex-complex-reveals-rearrangements-that-affect-ligand-binding
#5
Julia Wirmer-Bartoschek, Lars Erik Bendel, Hendrik R A Jonker, J Tassilo Grün, Francesco Papi, Carla Bazzicalupi, Luigi Messori, Paola Gratteri, Harald Schwalbe
Telomeric G-quadruplexes have recently emerged as drug targets in cancer research. Herein, we present the first NMR structure of a telomeric DNA G-quadruplex that adopts the biologically relevant hybrid-2 conformation in a ligand-bound state. We solved the complex with a metalorganic gold(III) ligand that stabilizes G-quadruplexes. Analysis of the free and bound structures reveals structural changes in the capping region of the G-quadruplex. The ligand is sandwiched between one terminal G-tetrad and a flanking nucleotide...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523433/structural-and-functional-roles-of-ether-lipids
#6
REVIEW
John M Dean, Irfan J Lodhi
Ether lipids, such as plasmalogens, are peroxisome-derived glycerophospholipids in which the hydrocarbon chain at the sn-1 position of the glycerol backbone is attached by an ether bond, as opposed to an ester bond in the more common diacyl phospholipids. This seemingly simple biochemical change has profound structural and functional implications. Notably, the tendency of ether lipids to form non-lamellar inverted hexagonal structures in model membranes suggests that they have a role in facilitating membrane fusion processes...
May 18, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28523359/arginine-cga-codons-as-a-source-of-nonsense-mutations-a-possible-role-in-multivariant-gene-expression-control-of-mrna-quality-and-aging
#7
Georgy A Romanov, Victor S Sukhoverov
Methylation of cytosine residues in DNA of higher eukaryotes, including humans, creates "hot spots" of C→T transitions in the genome. The predominantly methylated sequence in mammalian DNAs is CG (CpG). Among CG-containing codons, CGA codons for arginine are unique due to their ability to create stop codons TGA (UGA in mRNA) upon epigenetic-mediated mutation. As such nonsense mutations can have a strong adverse effect on the cell and organism, we have performed a study, on the example of human genes, aimed to characterise the anticipated effects of epigenetic-mediated nonsense mutations CGA→TGA in somatic cells...
May 18, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28523230/targeting-resolution-of-neuroinflammation-after-ischemic-stroke-with-a-lipoxin-a4-analog-protective-mechanisms-and-long-term-effects-on-neurological-recovery
#8
Kimberly E Hawkins, Kelly M DeMars, Jon C Alexander, Lauren G de Leon, Sean C Pacheco, Christina Graves, Changjun Yang, Austin O McCrea, Jan C Frankowski, Timothy J Garrett, Marcelo Febo, Eduardo Candelario-Jalil
BACKGROUND: Resolution of inflammation is an emerging new strategy to reduce damage following ischemic stroke. Lipoxin A4 (LXA 4) is an anti-inflammatory, pro-resolution lipid mediator that reduces neuroinflammation in stroke. Since LXA 4 is rapidly inactivated, potent analogs have been synthesized, including BML-111. We hypothesized that post-ischemic, intravenous treatment with BML-111 for 1 week would provide neuroprotection and reduce neurobehavioral deficits at 4 weeks after ischemic stroke in rats...
May 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28522129/provision-of-prehospital-emergency-medical-services-in-punjab-pakistan-case-study-of-a-public-sector-provider
#9
Veena M Sriram, Rizwan Naseer, Adnan A Hyder
BACKGROUND: The availability and quality of emergency medical services in low- and middle-income countries, including Pakistan, are extremely limited. New models for prehospital emergency medical services provision have recently emerged across multiple sectors, and research on these models is urgently needed to inform current and future emergency medical services systems in low-resource settings. The objective of this case study was to provide a comprehensive description of the organizational structure and service delivery model of a public sector provider in the Punjab Province of Pakistan, Rescue 1122, with a focus on operations in Lahore...
May 15, 2017: Surgery
https://www.readbyqxmd.com/read/28521814/access-to-healthcare-insurance-and-healthcare-services-among-syringe-exchange-program-clients-in-massachusetts-qualitative-findings-from-health-navigators-with-the-idu-i-do-care-collaborative
#10
Thomas J Stopka, Marguerite Hutcheson, Ashley Donahue
BACKGROUND: Little is known about access to health insurance among people who inject drugs (PWID) who attend syringe exchange programs (SEPs). The goal of the current study was to assess perceptions of SEP staff, including health navigators and program managers, on access to health insurance and healthcare access among SEP clients following implementation of state and federal policies to enhance universal healthcare access in Massachusetts. METHODS: Between December 2014 and January 2015, we conducted in-depth interviews (n = 14) with SEP staff, including both program managers and health navigators, to assess knowledge, attitudes, and beliefs related to health insurance enrollment and access to enhanced referrals among SEP clients...
May 18, 2017: Harm Reduction Journal
https://www.readbyqxmd.com/read/28521781/telling-our-stories-heroin-assisted-treatment-and-snap-activism-in-the-downtown-eastside-of-vancouver
#11
Susan Boyd, Dave Murray, Donald MacPherson
BACKGROUND: This article highlights the experiences of a peer-run group, SALOME/NAOMI Association of Patients (SNAP), that meets weekly in the Downtown Eastside of Vancouver, British Columbia, Canada. SNAP is a unique independent peer- run drug user group that formed in 2011 following Canada's first heroin-assisted treatment trial (HAT), North America Opiate Medication Initiative (NAOMI). SNAP's members are now made up of former research participants who participated in two heroin-assisted trials in Vancouver...
May 18, 2017: Harm Reduction Journal
https://www.readbyqxmd.com/read/28521528/prevention-and-control-of-emergent-infectious-disease-with-high-specific-antigen-sensor
#12
Hongzhe Zhang, Shanshan Zhang, Nan Liu
This study aims to evaluate the application of a new type of high specificity antigen sensor in detecting the viruses in sudden infectious diseases. Influenza A (H1N1) virus immunosensor was used for the respective determination of the six kinds of antigens of H1N1, H3N2 viral protein, HA protein of H7N9, influenza B virus, adenovirus, and EV71 virus of same dilution degree on the Screen Printed Carbon Electrode (SPCE), so as to test the specificity of the detection method. In addition, various batches of chick embryo allantoic saliva dilution simulation samples were also detected on their recovery (accuracy), repeatability (precision), and stability...
May 18, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28517927/stable-high-performance-flexible-photodetector-based-on-upconversion-nanoparticles-perovskite-microarrays-composite
#13
Jianbo Li, Yingli Shen, Yucheng Liu, Feng Shi, Xiaodong Ren, Tianqi Niu, Kui Zhao, Shengzhong Frank Liu
Methylammonium lead halide perovskite is emerged as a new class of low-temperature-processed high-performance semiconductors for optoelectronics, but with photoresponse limited to the UV-visible region and low environmental stability. Herein, we report a flexible planar photodetector based on MAPbI3 microarrays integrated with NaYF4:Yb/Er upconversion nanoparticles (UCns) that offers promise for future high performance and long-term stability operation. The promise derives from the confluence of several factors, including significantly enhanced photons absorption in the visible spectrum, efficient energy transition in the NIR region, and inhibition of water attack by the hydrophobic UCns capping layer...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28516466/bioinspired-synthesis-of-cu2-modified-covalent-triazine-framework-a-new-highly-efficient-and-promising-peroxidase-mimic
#14
Fanggui Ye, Yuhao Xiong, Yuemei Qin, Linjing Su
Artificial enzyme mimetics is an emerging field of research owing to the remarkable advantages of enzyme mimics over native enzymes, including tunable catalytic efficiencies, lower cost, ease of preparation, and excellent tolerance to reaction systems. Herein, we report an efficient peroxidase mimic based on a copper-modified covalent triazine framework (CCTF). Owing to its unique specific surface area, atomically dispersed active Cu sites, efficient electron transfer, and enhanced photo-assisted peroxidase-like activity, the CCTF showed superior peroxidase-like enzyme activity...
May 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28516429/cardinal-epigenetic-role-of-non-coding-regulatory-rnas-in-circadian-rhythm
#15
REVIEW
Utpal Bhadra, Pradipta Patra, Manika Pal-Bhadra
Circadian rhythm which governs basic physiological activities like sleeping, feeding and energy consumption is regulated by light-controlled central clock genes in the pacemaker neuron. The timekeeping machinery with unique transcriptional and post-transcriptional feedback loops is controlled by different small regulatory RNAs in the brain. Roles of the multiple neuronal genes, especially post-transcriptional regulation, splicing, polyadenylation, mature mRNA editing, and stability of translation products, are controlled by epigenetic activities orchestrated via small RNAs...
May 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28516205/applications-of-white-rot-fungi-in-bioremediation-with-nanoparticles-and-biosynthesis-of-metallic-nanoparticles
#16
REVIEW
Kai He, Guiqiu Chen, Guangming Zeng, Zhenzhen Huang, Zhi Guo, Tiantian Huang, Min Peng, Jiangbo Shi, Liang Hu
White rot fungi (WRF) are important environmental microorganisms that have been widely applied in many fields. To our knowledge, the application performance of WRF in bioremediation can be greatly improved by the combination with nanotechnology. And the preparation of metallic nanoparticles using WRF is an emerging biosynthesis approach. Understanding the interrelation of WRF and nanoparticles is important to further expand their applications. Thus, this mini-review summarizes the currently related reports mainly from the two different point of views...
May 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28516168/selective-surface-pegylation-of-uio-66-nanoparticles-for-enhanced-stability-cell-uptake-and-ph-responsive-drug-delivery
#17
Isabel Abánades Lázaro, Salame Haddad, Sabrina Sacca, Claudia Orellana-Tavra, David Fairen-Jimenez, Ross S Forgan
The high storage capacities and excellent biocompatibilities of metal-organic frameworks (MOFs) have made them emerging candidates as drug-delivery vectors. Incorporation of surface functionality is a route to enhanced properties, and here we report on a surface-modification procedure-click modulation-that controls their size and surface chemistry. The zirconium terephthalate MOF UiO-66 is (1) synthesized as ∼200 nm nanoparticles coated with functionalized modulators, (2) loaded with cargo, and (3) covalently surface modified with poly(ethylene glycol) (PEG) chains through mild bioconjugate reactions...
April 13, 2017: Chem
https://www.readbyqxmd.com/read/28516119/affinity-pulldown-of-biotinylated-rna-for-detection-of-protein-rna-complexes
#18
Amaresh C Panda, Jennifer L Martindale, Myriam Gorospe
RNA-binding proteins (RBPs) have recently emerged as crucial players in the regulation of gene expression. The interactions of RBPs with target mRNAs control the levels of gene products by altering different regulatory steps, including pre-mRNA splicing and maturation, nuclear mRNA export, and mRNA stability and translation (Glisovic et al., 2008). There are several methodologies available today to identify RNAs bound to specific RBPs; some detect only recombinant molecules in vitro, others detect recombinant and endogenous molecules, while others detect only endogenous molecules...
December 20, 2016: Bio-protocol
https://www.readbyqxmd.com/read/28513470/phase-diagram-of-the-shastry-sutherland-kondo-lattice-model-with-classical-localized-spins-a-variational-calculation-study
#19
Munir Shahzad, Pinaki Sengupta
We study the Kondo lattice Shastry-Sutherland model with additional Dzyaloshinskii-Moriya~(DM) interactions, exploring the possible magnetic phases in its multi-dimensional parameter space. Treating the local moments as classical spins and using a variational ansatz, we identify the parameter ranges over which various common magnetic orderings are potentially stabilized. Our results reveal that the competing interactions result in a heightened susceptibility towards a wide range of spin configurations including longitudinal ferromagnetic and antiferromagnetic order, coplanar flux configurations and most interestingly, multiple non-coplanar configurations including a novel canted flux state as the different Hamiltonian parameters like electron density, interaction strengths and degree of frustration are varied...
May 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28511708/enzyme-mediated-formulation-of-stable-elliptical-silver-nanoparticles-tested-against-clinical-pathogens-and-mdr-bacteria-and-development-of-antimicrobial-surgical-thread
#20
Rupak Thapa, Chintan Bhagat, Pragya Shrestha, Suvash Awal, Pravin Dudhagara
BACKGROUND: Silver nanoparticles (AgNPs) are believed to be emerging tool against various infectious diseases including multi-drug resistant (MDR) bacteria. In the present study, in vitro synthesis of AgNPs was optimized using 1:50 ratio of macerozyme (25 μg/μl) and 1 mM AgNO3 incubated at 80 °C for 8 h. AgNPs were characterized by UV-Visible spectroscopy, dynamic light scattering (DLS), scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD)...
May 16, 2017: Annals of Clinical Microbiology and Antimicrobials
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