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https://www.readbyqxmd.com/read/28721044/stimulated-phase-shift-acoustic-nanodroplets-enhance-vancomycin-efficacy-against-methicillin-resistant-staphylococcus-aureus-biofilms
#1
Hao Guo, Ziming Wang, Quanyin Du, Pan Li, Zhigang Wang, Aimin Wang
PURPOSE: Bacterial biofilms on the surface of prostheses are becoming a rising concern in managing prosthetic joint infections. The inherent resistant features of biofilms render traditional antimicrobial therapy unproductive and revision surgery outcomes uncertain. This situation has prompted the exploration of novel antimicrobial strategies. The synergy of ultrasound microbubbles and vancomycin has been proposed as an efficient alternative for biofilm eradication. The purpose of this study was to evaluate the anti-biofilm effect of stimulated phase-shift acoustic nanodroplets (NDs) combined with vancomycin...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28719199/giant-pbse-cdse-cdse-quantum-dots-crystal-structure-limited-ultrastable-near-infrared-photoluminescence-from-single-nanocrystals
#2
Christina J Hanson, Nicolai F Hartmann, Ajay Singh, Xuedan Ma, William J I DeBenedetti, Joanna L Casson, John K Grey, Yves J Chabal, Anton V Malko, Milan Sykora, Andrei Piryatinski, Han Htoon, Jennifer A Hollingsworth
Toward a truly photostable PbSe quantum dot (QD) we apply the thick-shell or "giant" QD structural motif to this notoriously environmentally sensitive nanocrystal system. Namely, using a sequential application of two shell-growth techniques-partial-cation exchange and successive ionic layer adsorption and reaction (SILAR)-we are able to overcoat the PbSe QDs with sufficiently thick CdSe shells to impart new single-QD-level photostability as evidenced by suppression of both photobleaching and blinking behavior...
July 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28718989/formation-of-stone-wales-edge-multistep-reconstruction-and-growth-mechanisms-of-zigzag-nanographene
#3
Jing-Shuang Dang, Wei-Wei Wang, Jia-Jia Zheng, Shigeru Nagase, Xiang Zhao
Although the existence of Stone-Wales (5-7) defect at graphene edge has been clarified experimentally, theoretical study on the formation mechanism is still imperfect. In particular, the regioselectivity of multistep reactions at edge (self-reconstruction and growth with foreign carbon feedstock) is essential to understand the kinetic behavior of reactive boundaries but investigations are still lacking. Herein, by using finite-sized models, multistep reconstructions and carbon dimer additions of a bared zigzag edge are introduced using density functional theory calculations...
July 18, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28716648/applications-of-high-speed-atomic-force-microscopy-to-real-time-visualization-of-dynamic-biomolecular-processes
#4
REVIEW
Takayuki Uchihashi, Simon Scheuring
BACKGROUND: Many biological processes in a living cell are consequences of sequential and hierarchical dynamic events of biological macromolecules such as molecular interactions and conformational changes. Hence, knowledge of structures, assembly and dynamics of proteins is the foundation for understanding how biological molecules work. Among several techniques to analyze dynamics of proteins, high-speed atomic force microscopy (HS-AFM) is unique to provide direct information about both structure and dynamics of single proteins at work...
July 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28715420/blood-vessel-tortuosity-selects-against-evolution-of-aggressive-tumor-cells-in-confined-tissue-environments-a-modeling-approach
#5
András Szabó, Roeland M H Merks
Cancer is a disease of cellular regulation, often initiated by genetic mutation within cells, and leading to a heterogeneous cell population within tissues. In the competition for nutrients and growth space within the tumors the phenotype of each cell determines its success. Selection in this process is imposed by both the microenvironment (neighboring cells, extracellular matrix, and diffusing substances), and the whole of the organism through for example the blood supply. In this view, the development of tumor cells is in close interaction with their increasingly changing environment: the more cells can change, the more their environment will change...
July 17, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28697597/core-assisted-formation-of-porphyrin-j-aggregates-in-ph-sensitive-polyelectrolyte-microcapsules-followed-by-fluorescence-lifetime-imaging-microscopy
#6
Vanda Vaz Serra, Nuno G B Neto, Suzana M Andrade, Silvia M B Costa
A strategy assisted by an inorganic template was developed to promote the organized self-assembly of meso-(tetrakis)-(p-sulfonatophenyl)porphyrin (TSPP) on pH sensitive core-shell polyelectrolyte microcapsules (PECs) of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH). A key feature of this strategy is the use of template CaCO3 microparticles as a nucleation site endorsing inside-outside directional growth of porphyrin aggregates. Using this approach, TSPP self-assembly in positively charged PECs with CaCO3 (PAH/PSS)2PAH as a sequence of layers was successfully achieved using pH mild conditions (pH 3)...
July 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28692096/a-quantum-rovibrational-state-selected-study-of-the-proton-transfer-reaction-h2-x-2-%C3%AE-v-1-3-n-0-3-ne-%C3%A2-neh-h-using-the-pulsed-field-ionization-photoion-method-observation-of-the-rotational-effect-near-the-reaction-threshold
#7
Bo Xiong, Yih-Chung Chang, Cheuk-Yiu Ng
Using the sequential electric field pulsing scheme for vacuum ultraviolet (VUV) laser pulsed field ionization-photoion (PFI-PI) detection, we have successfully prepared H2(+)(X(2)Σ: v(+) = 1-3; N(+) = 0-5) ions in the form of an ion beam in single quantum-rovibrational-states with high purity, high intensity, and narrow laboratory kinetic energy spread (ΔElab ≈ 0.05 eV). This VUV-PFI-PI ion source, when coupled with the double-quadrupole double-octupole ion-molecule reaction apparatus, has made possible a systematic examination of the vibrational- as well as rotational-state effects on the proton transfer reaction of H2(+)(X(2)Σ: v(+); N(+)) + Ne...
July 10, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28689319/barriers-to-success-physical-separation-optimizes-event-file-retrieval-in-shared-workspaces
#8
Bibiana Klempova, Roman Liepelt
Sharing tasks with other persons can simplify our work and life, but seeing and hearing other people's actions may also be very distracting. The joint Simon effect (JSE) is a standard measure of referential response coding when two persons share a Simon task. Sequential modulations of the joint Simon effect (smJSE) are interpreted as a measure of event-file processing containing stimulus information, response information and information about the just relevant control-state active in a given social situation...
July 8, 2017: Psychological Research
https://www.readbyqxmd.com/read/28675218/multi-layer-transfer-and-lamination-mtl-process-assisted-by-a-high-pressure-air-jet-for-highly-efficient-solution-processed-polymer-light-emitting-diodes
#9
Syed Azkar Ul Hasan, Hongseok Youn
This research reports fabrication of highly efficient polymer light-emitting diodes (PLEDs) by a thermally activated multi-layer transfer and lamination (MTL) process. As the first stage of the fabrication process, multiple layers consisting of a light-emitting polymer, electron transport/electron injection layer and metal cathode were sequentially deposited onto a hydrophobic low-surface energy self-assembled monolayer (SAM)-coated glass substrate. Subsequently, a very rapid delamination of PLEDs multi-layers from the SAM-coated glass was achieved by applying a high-pressure air jet...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28646301/random-initialisation-of-the-spectral-variables-an-alternate-approach-for-initiating-multivariate-curve-resolution-alternating-least-square-mcr-als-analysis
#10
Keshav Kumar
Multivariate curve resolution alternating least square (MCR-ALS) analysis is the most commonly used curve resolution technique. The MCR-ALS model is fitted using the alternate least square (ALS) algorithm that needs initialisation of either contribution profiles or spectral profiles of each of the factor. The contribution profiles can be initialised using the evolve factor analysis; however, in principle, this approach requires that data must belong to the sequential process. The initialisation of the spectral profiles are usually carried out using the pure variable approach such as SIMPLISMA algorithm, this approach demands that each factor must have the pure variables in the data sets...
June 23, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28645701/effect-of-phosphate-solubilizing-bacteria-on-phosphorus-dynamics-and-the-bacterial-community-during-composting-of-sugarcane-industry-waste
#11
German A Estrada-Bonilla, Cintia M Lopes, Ademir Durrer, Paulo R L Alves, Nicolle Passaglia, Elke J B N Cardoso
Sugarcane processing generates a large quantity of residues, such as filter cake and ashes, which are sometimes composted prior to their amendment in soil. However, important issues still have to be addressed on this subject, such as the description of bacterial succession that occurs throughout the composting process and the possibilities of using phosphate-solubilizing bacteria (PSB) during the process to improve phosphorus (P) availability in the compost end product. Consequently, this study evaluated the bacterial diversity and P dynamics during the composting process when inoculated with Pseudomonas aeruginosa PSBR12 and Bacillus sp...
July 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28636088/multicompartment-drug-release-system-for-dynamic-modulation-of-tissue-responses
#12
Aaron H Morris, Rajwant S Mahal, Jillian Udell, Michelle Wu, Themis R Kyriakides
Pharmacological modulation of responses to injury is complicated by the need to deliver multiple drugs with spatiotemporal resolution. Here, a novel controlled delivery system containing three separate compartments with each releasing its contents over different timescales is fabricated. Core-shell electrospun fibers create two of the compartments in the system, while electrosprayed spheres create the third. Utility is demonstrated by targeting the foreign body response to implants because it is a dynamic process resulting in implant failure...
June 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28634757/a-uhplc-ms-ms-method-for-profiling-multifunctional-steroids-in-human-hair
#13
Zhen Dong, Caihong Wang, Jinlan Zhang, Zhe Wang
It is important to profile steroids in many physiological and pathological processes. Recently, hair has been used for the long-term measurement of endogenous steroid hormones. Analyzing hair has advantages of being noninvasive and time sequential compared with other bio-specimens. Liquid chromatography-mass spectrometry (LC-MS) techniques have been widely used over the past decades; however, it is challenging to profile estrogens in hair by LC-MS, and more comprehensive steroid profiling is required. In this paper, an ultra high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was developed to simultaneously profile 28 multifunctional steroids, including corticosteroids (n = 6), estrogens (n = 13), androgens (n = 5) and progestogens (n = 4), in human scalp hair in a single run...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28628812/modelling-water-and-nutrient-fluxes-in-the-danube-river-basin-with-swat
#14
REVIEW
Anna Malagó, Faycal Bouraoui, Olga Vigiak, Bruna Grizzetti, Marco Pastori
This study provides an innovative process-based modelling approach using the SWAT model and shows its application to support the implementation of the European environmental policies in large river basins. The approach involves several pioneering modelling aspects: the inclusion of current management practices; an innovative calibration and validation methodology of streamflow and water quality; a sequential calibration starting from crop yields, followed by streamflow and nutrients; and the use of concentrations instead of loads in the calibration...
June 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28622633/generalized-parameter-estimation-and-calibration-for-biokinetic-models-using-correlation-and-single-variable-optimisations-application-to-sulfate-reduction-modelling-in-anaerobic-digestion
#15
Wasim Ahmed, Jorge Rodríguez
In this work, a generalized method for the estimation of biokinetic parameters in anaerobic digestion (AD) models is proposed. The method consists of a correlation-based approach to estimate specific groups of parameters mechanistically, followed by a sensitivity-based hierarchical and sequential single parameter optimisation (SHSSPO) calibration method for the remaining groups of parameters. The method was evaluated to estimate and calibrate the parameter values for sulfate reduction processes when included into the IWA Anaerobic Digestion Model No...
May 31, 2017: Water Research
https://www.readbyqxmd.com/read/28621481/metal-free-room-temperature-oxygen-atom-transfer-in-the-n%C3%A2-o-co-redox-couple-as-catalyzed-by-si%C3%A2-ox-%C3%A2-x-2-5
#16
Xiaoyan Sun, Shaodong Zhou, Lei Yue, Maria Schlangen, Helmut Schwarz
The thermal reduction of N₂O by CO mediated by the metal-free cluster cations [Si₂Ox]*+ (x = 2-5) has been examined in the gas phase using Fourier transform-ion cyclotron resonance (FT-ICR) mass spectrometry in conjunction with quantum chemical calculations. Three successive oxidation/reduction steps occur starting from [Si₂O₂]*+ and N₂O to form eventually [Si₂O₅]*+; the latter as well as the intermediate oxide cluster ions react sequentially with CO molecules to regenerate [Si₂O₂]*+. Thus, full catalytic cycles occur at ambient conditions in the gas phase...
June 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28618208/experiences-of-registered-nurses-transitioning-from-employment-in-acute-care-to-primary-health-care-quantitative-findings-from-a-mixed-methods-study
#17
Christine Ashley, Elizabeth Halcomb, Angela Brown, Kath Peters
AIM: To describe the experiences of registered nurses who transition from acute to primary health care (PHC) employment. BACKGROUND: Internationally the provision of health care in PHC settings is increasing. Nurses are moving from acute care employment to meet the growing demand for a PHC workforce. However, little is known about the transition experiences of these nurses. DESIGN: A sequential mixed methods study comprising a survey, and semi-structured interviews...
June 15, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28604148/porous-fibres-with-encapsulated-functional-materials-and-tunable-release
#18
Yijun Chen, James G Boyd, Mohammad Naraghi
A novel sequential processing approach to fabricate versatile fibres containing encapsulated materials is presented. It is based on developing highly porous fibres, to be filled with functional materials and coated with protective layers. Applicability of the approach to develop porous poly(methyl methacrylate) (PMMA) fibres with encapsulated antibacterial salts within a coating is demonstrated. The salt was introduced to the fibre via a sacrificial solvent. Desired solvent properties to ensure successful filling was discussed...
June 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28603773/what-is-your-neural-function-visual-narrative-conjunction-grammar-meaning-and-fluency-in-sequential-image-processing
#19
Neil Cohn, Marta Kutas
Visual narratives sometimes depict successive images with different characters in the same physical space; corpus analysis has revealed that this occurs more often in Japanese manga than American comics. We used event-related brain potentials to determine whether comprehension of "visual narrative conjunctions" invokes not only incremental mental updating as traditionally assumed, but also, as we propose, "grammatical" combinatoric processing. We thus crossed (non)/conjunction sequences with character (in)/congruity...
2017: Cognitive Research: Principles and Implications
https://www.readbyqxmd.com/read/28590054/%C3%AF-extended-dihydrophenazines-with-three-state-nir-electrochromism-involving-large-conformational-changes
#20
Juri Nagasaki, Satoru Hiroto, Hiroshi Shinokubo
π-Extended dihydrophenazines were successfully prepared by oxidation of 2-(N-arylamino)anthracenes. Their roof-type conformations were revealed by X-ray diffraction analysis, and the analysis of the optical properties indicated the presence of intramolecular charge-transfer processes. Upon chemical oxidation, the electronic absorption dramatically changed in a two-step fashion. The ESR analysis revealed that, depending on the amount of oxidant added, either a paramagnetic radical cation or a diamagnetic dication was generated...
June 7, 2017: Chemistry, An Asian Journal
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