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https://www.readbyqxmd.com/read/28538098/two-dimensional-metal-organic-framework-nanosheets-as-an-enzyme-inhibitor-modulation-of-the-%C3%AE-chymotrypsin-activity
#1
Ming Xu, Shuai Yuan, Xin-Yu Chen, Yu-Jie Chang, Gregory Steven Day, Zhi-Yuan Gu, Hong-Cai Zhou
Two-dimensional metal-organic framework (MOF) nanosheets are utilized as effective enzyme inhibitors, providing an in-spiring means to enhance the control of cellular processes as well as improve our understanding of the surface chemistry between MOFs and enzymes. In this paper, we demonstrated that the activity of α-Chymotrypsin (ChT) can be effectively inhibited with 96.9% inhibition by the 2-D Cu(bpy)2(OTf)2 nanosheets, while the other Zn2(bim)4 nanosheets show no significant inhibition effect towards ChT...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28535342/diffusion-under-confinement-hydrodynamic-finite-size-effects-in-simulation
#2
Pauline Simonnin, Benoit Noetinger, Carlos Nieto Draghi, Virginie Marry, Benjamin Rotenberg
We investigate finite-size effects on diffusion in confined fluids using molecular dynamics simulations and hydrodynamic calculations. Specifically, we consider a Lennard-Jones fluid in slit pores without slip at the interface and show that the use of periodic boundary conditions in the directions along the surfaces results in dramatic finite-size effects, in addition to that of the physically relevant confining length. As in the simulation of bulk fluids, these effects arise from spurious hydrodynamic interactions between periodic images and from the constraint of total momentum conservation...
May 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28535292/adaptive-radiation-of-p-fluorescens-sbw25-in-experimental-microcosms-provides-an-understanding-of-the-evolutionary-ecology-and-molecular-biology-of-a-l-interface-biofilm-formation
#3
Anna Koza, Anna Kusmierska, Kimberley McLaughlin, Olena Moshynets, Andrew J Spiers
Combined experimental evolutionary and molecular biology approaches have been used to investigate the adaptive radiation of Pseudomonas fluorescens SBW25 in static microcosms leading to the colonisation of the air-liquid interface by biofilm-forming mutants such as the Wrinkly Spreader. In these microcosms, the ecosystem engineering of the early wild-type colonists establish the niche space for subsequent WS evolution and colonisation. Random WS mutations occurring in the developing population that de-regulate diguanylate cyclases and c-di-GMP homeostasis result in cellulose-based biofilms at the air-liquid interface...
May 23, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28535055/ionic-liquid-anion-controlled-nanoscale-gold-morphology-grown-at-a-liquid-interface
#4
Nakara Bhawawet, Jeremy B Essner, Durgesh Vinod Wagle, Gary A Baker
Two different ionic liquids comprising the tetrabutylphosphonium cation ([P4444]) paired with the strongly-coordinating anions 6-aminocaproate ([6-AC]) or taurinate ([tau]) were prepared and employed in an aqueous/organic liquid bilayer system to generate nanoscale gold by Au(OH)4- photoreduction. Generally, as the concentration of ionic liquid in the organic phase was increased, the resulting quasi-spherical gold nanoparticles reduced in size and presented less aggregation, leading to marked increases in the catalytic efficiency for 4-nitrophenol reduction using borohydride...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534785/efficient-hardware-implementation-of-real-time-low-power-movement-intention-detector-system-using-fft-and-adaptive-wavelet-transform
#5
Alireza Chamanzar, Mahdi Shabany, Alireza Malekmohammadi, Sara Mohammadinejad
The brain-computer interfacing (BCI), a platform to extract features and classify different motor movement tasks from noisy and highly correlated electroencephalogram signals, is limited mostly by the complex and power-hungry algorithms. Among different techniques recently devised to tackle this issue, real-time onset detection, due to its negligible delay and minimal power overhead, is the most efficient one. Here, we propose a novel algorithm that outperforms the state-of-the-art design by sixfold in terms of speed, without sacrificing the accuracy for a real-time, hand movement intention detection based on the adaptive wavelet transform with only 1 s detection delay and maximum sensitivity of 88% and selectivity of 78% (only 7% loss of sensitivity)...
May 17, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28534628/exafs-ab-initio-molecular-dynamics-and-nicis-spectroscopy-studies-on-an-organic-dye-model-at-the-dye-sensitized-solar-cell-photoelectrode-interface
#6
Peng Liu, Viktor Johansson, Herri Trilaksana, Jan Rosdahl, Gunther G Andersson, Lars Kloo
The organization of dye molecules in the dye layer adsorbed on the semiconductor substrate in dye-sensitized solar cell has been studied using a combination of theoretical methods and experimental techniques. The model system is based on the simple D--A dye L0, which has been chemically modified to replace the acceptor group -CN by -Br (L0Br) in order to offer better X-ray contrast. Experimental EXAFS data based on the Br K-edge backscattering show no obvious difference between dye-sensitised titania powder and titania film samples, thus allowing model systems to be based on powder slurrys...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534438/the-axonal-cytoskeleton-and-the-assembly-of-nodes-of-ranvier
#7
Aniket Ghosh, Diane L Sherman, Peter J Brophy
Vertebrate nervous systems rely on rapid nerve impulse transmission to support their complex functions. Fast conduction depends on ensheathment of nerve axons by myelin-forming glia and the clustering of high concentrations of voltage-gated sodium channels (Nav) in the axonal gaps between myelinated segments. These gaps are the nodes of Ranvier. Depolarization of the axonal membrane initiates the action potential responsible for impulse transmission, and the Nav help ensure that this is restricted to nodes...
May 1, 2017: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
https://www.readbyqxmd.com/read/28534400/opto-valleytronic-spin-injection-in-monolayer-mos2-few-layer-graphene-hybrid-spin-valves
#8
Yunqiu Kelly Luo, Jinsong Xu, Tiancong Zhu, Guanzhong Wu, Elizabeth Joan McCormick, Wenbo Zhan, Mahesh R Neupane, Roland K Kawakami
Two dimensional (2D) materials provide a unique platform for spintronics and valleytronics due to the ability to combine vastly different functionalities into one vertically-stacked heterostructure, where the strengths of each of the constituent materials can compensate for the weaknesses of the others. Graphene has been demonstrated to be an exceptional material for spin transport at room temperature, however it lacks a coupling of the spin and optical degrees of freedom. In contrast, spin/valley polarization can be efficiently generated in monolayer transition metal dichalcogenides (TMD) such as MoS2 via absorption of circularly-polarized photons, but lateral spin or valley transport has not been realized at room temperature...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28533102/real-time-electronic-dashboard-technology-and-its-use-to-improve-pediatric-radiology-workflow
#9
REVIEW
Randheer Shailam, Ariel Botwin, Markus Stout, Michael S Gee
The purpose of our study was to create a real-time electronic dashboard in the pediatric radiology reading room providing a visual display of updated information regarding scheduled and in-progress radiology examinations that could help radiologists to improve clinical workflow and efficiency. To accomplish this, a script was set up to automatically send real-time HL7 messages from the radiology information system (Epic Systems, Verona, WI) to an Iguana Interface engine, with relevant data regarding examinations stored in an SQL Server database for visual display on the dashboard...
March 19, 2017: Current Problems in Diagnostic Radiology
https://www.readbyqxmd.com/read/28533009/comparison-of-implant-stability-measurement-devices-for-bone-anchored-hearing-aid-systems
#10
Lindsey Westover, Gary Faulkner, William Hodgetts, Don Raboud
STATEMENT OF PROBLEM: The success of implants for bone-anchored hearing aids (BAHA) relies on proper osseointegration at the bone-implant interface. Clinical evaluation of implant stability is important in prescribing loading, identifying the risk of failure, and monitoring the long-term health of the implant. PURPOSE: The purpose of this in vitro study was to evaluate 2 measurement systems for BAHA implant stability: the most commonly used, Osstell implant stability quotient (ISQ), and a newly developed advance system for implant stability testing (ASIST)...
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28532843/expression-and-regulation-of-interleukin-6-and-its-receptor-at-the-maternal-conceptus-interface-during-pregnancy-in-pigs
#11
Inkyu Yoo, Jisoo Han, Minjeong Kim, Hwanhee Jang, Soojin Sa, Sun-Ho Choi, Hakhyun Ka
It has been well established that interleukin 6 (IL6), a pleiotropic cytokine with multiple functional roles, is widely expressed in the female reproductive tract and mediates blastocyst implantation and placental development in many species. Uterine expression of IL6 during early pregnancy has been studied in pigs, but expression and function of IL6 at the maternal-placental interface throughout pregnancy have not been determined. Thus, we examined expression of IL6 and its receptors, IL6 receptor (IL6R) and GP130, in the uterine endometrium on Days 12 and 15 of the estrous cycle, and Days 12, 15, 30, 60, 90, and 114 of pregnancy, conceptus on Days 12 and 15, and chorioallantoic tissues on Days 30, 60, 90, and 114 of pregnancy in pigs...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28532663/recent-developments-in-drug-eluting-devices-with-tailored-interfacial-properties
#12
REVIEW
Eva Sanchez-Rexach, Emilio Meaurio, Jose-Ramon Sarasua
Drug eluting devices have greatly evolved during past years to become fundamental products of great marketing importance in the biomedical field. There is currently a large diversity of highly specialized devices for specific applications, making the development of these devices an exciting field of research. The replacement of the former bare metal devices by devices loaded with drugs allowed the sustained and controlled release of drugs, to achieve the desired local therapeutic concentration of drug. The newer devices have been "engineered" with surfaces containing micro- and nanoscale features in a well-controlled manner, that have shown to significantly affect cellular and subcellular function of various biological systems...
May 4, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28532450/lps-induced-systemic-inflammation-reveals-an-immunomodulatory-role-for-the-prion-protein-at-the-blood-brain-interface
#13
Ø Salvesen, M R Reiten, A Espenes, M K Bakkebø, M A Tranulis, C Ersdal
BACKGROUND: The cellular prion protein (PrP(C)) is an evolutionary conserved protein abundantly expressed not only in the central nervous system but also peripherally including the immune system. A line of Norwegian dairy goats naturally devoid of PrP(C) (PRNP (Ter/Ter)) provides a novel model for studying PrP(C) physiology. METHODS: In order to explore putative roles for PrP(C) in acute inflammatory responses, we performed a lipopolysaccharide (LPS, Escherichia coli O26:B6) challenge of 16 goats (8 PRNP (+/+) and 8 PRNP (Ter/Ter)) and included 10 saline-treated controls (5 of each PRNP genotype)...
May 22, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28532308/contributions-of-national-and-global-health-estimates-to-monitoring-health-related-sustainable-development-goals-in-thailand
#14
Kanitta Bundhamcharoen, Supon Limwattananon, Khanitta Kusreesakul, Viroj Tangcharoensathien
The Millennium Development Goals (MDGs) triggered increased demand for data on child and maternal mortality for monitoring progress. With the advent of the Sustainable Development Goals (SDGs) and growing evidence of an epidemiological transition towards non-communicable diseases, policy makers need data on mortality and disease trends and distribution to inform effective policies and support monitoring progress. Where there are limited capacities to produce national health estimates (NHEs), global health estimates (GHEs) can fill gaps for global monitoring and comparisons...
January 2017: Global Health Action
https://www.readbyqxmd.com/read/28532113/nanofibers-of-human-tropoelastin-inspired-peptides-structural-characterization-and-biological-properties
#15
Valeria Secchi, Stefano Franchi, Marco Fioramonti, Giovanni Polzonetti, Giovanna Iucci, Brigida Bochicchio, Chiara Battocchio
Regenerative medicine is taking great advantage from the use of biomaterials in the treatments of a wide range of diseases and injuries. Among other biomaterials, self-assembling peptides are appealing systems due to their ability to spontaneously form nanostructured hydrogels that can be directly injected into lesions. Indeed, self-assembling peptide scaffolds are expected to behave as biomimetic matrices able to surround cells, to promote specific interactions, and to control and modify cell behavior by mimicking the native environment as well...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532027/evaluation-of-different-surface-treatments-on-fiber-post-cemented-with-a-self-adhesive-system
#16
Maíra Prado, Juliana N Marques, Gisele Damiana Pereira, Eduardo M da Silva, Renata A Simão
Surface treatment of fiber-reinforced posts can increase adhesion, especially on the post/resin cement interface. The purpose of this in vitro study was to evaluate the effect of different surface treatments on fiber post cemented with a self-adhesive system. Sixty fiberglass epoxy resin posts were cleaned, dried and divided into 6 groups (n=10): Control (no surface treatment), silane (silane coupling agent was applied homogeneously on surface), 24% hydrogen peroxide (H2O2) (immersion during 1min), blasting (blasting with aluminum oxide for 30s), NH3 plasma (plasma treatment for 3min) and HMDSO plasma (plasma treatment for 15min)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531174/genome-partitioner-a-web-tool-for-multi-level-partitioning-of-large-scale-dna-constructs-for-synthetic-biology-applications
#17
Matthias Christen, Luca Del Medico, Heinz Christen, Beat Christen
Recent advances in lower-cost DNA synthesis techniques have enabled new innovations in the field of synthetic biology. Still, efficient design and higher-order assembly of genome-scale DNA constructs remains a labor-intensive process. Given the complexity, computer assisted design tools that fragment large DNA sequences into fabricable DNA blocks are needed to pave the way towards streamlined assembly of biological systems. Here, we present the Genome Partitioner software implemented as a web-based interface that permits multi-level partitioning of genome-scale DNA designs...
2017: PloS One
https://www.readbyqxmd.com/read/28530796/what-do-laser-induced-transient-techniques-reveal-for-batteries-na-and-k-intercalation-from-aqueous-electrolytes-as-an-example
#18
Daniel Scieszka, Jeongsik Yun, Aliaksandr S Bandarenka
Technological advancement has been revolutionized by rechargeable batteries, without which the use of various modern devices would not be possible. Aqueous Na-ion batteries have lately garnered much attention, being rec-ognized as a promising alternative to the commonly used Li-ion batteries for the large-scale energy storage systems. However, further improvement and optimization of such systems require a more detailed understanding of intercalation mechanisms. In this work, we for the first time demonstrate implementation of the laser induced current transient (LICT) technique for in-situ characterization of battery systems and investigate the interface between Na2Ni[Fe(CN)6] model battery electrodes in contact with aqueous electrolytes...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530400/probing-the-conformation-dependent-preferential-binding-of-ethanol-to-cationic-glycylalanylglycine-in-water-ethanol-by-vibrational-and-nmr-spectroscopy
#19
David DiGuiseppi, Bridget J Milorey, Gabrielle Lewis, Nina Kubatova, Stefanie Farrell, Harald Schwalbe, Reinhard Schweitzer-Stenner
The conformational propensity of amino acid residues is determined by an intricate balance of peptide-solvent and solvent-solvent interactions. In order to explore how the systematic replacement of water by a cosolvent affects the solvation of both amino acid backbone and side chains we, performed a combined vibrational spectroscopy and NMR study of cationic glycylalanylglycine (GAG) in different ethanol/water mixtures between 0 and 42 mole percent of ethanol. The classical model peptide N'-methylacetamide was used as a reference system to probe solvent-induced spectroscopic changes...
May 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28530388/microfluidic-capillary-electrophoresis-mass-spectrometry-for-analysis-of-monosaccharides-oligosaccharides-and-glycopeptides
#20
Kshitij Khatri, Joshua A Klein, John Haserick, Deborah R Leon, Catherine E Costello, Mark E McComb, Joseph Zaia
Glycomics and glycoproteomics analyses by mass spectrometry require efficient front-end separation methods to enable deep characterization of heterogeneous glycoform populations. Chromatography methods are generally limited in their ability to resolve glycoforms using mobile phases that are compatible with online liquid chromatography-mass spectrometry (LC-MS). The adoption of capillary electrophoresis-mass spectrometry methods (CE-MS) for glycomics and glycoproteomics is limited by the lack of convenient interfaces for coupling the CE devices to mass spectrometers...
May 22, 2017: Analytical Chemistry
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