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https://www.readbyqxmd.com/read/28809755/multiple-timescales-in-the-photoswitching-kinetics-of-crystalline-thin-films-of-azobenzene-trimers
#1
Christopher Weber, Linus Pithan, Anton Zykov, Sebastian Bommel, Francesco Carla, Roberto Felici, Christopher Knie, David Bléger, Stefan Kowarik
Functional materials that exhibit photoinduced structural phase transitions are highly interesting for applications in optomechanics and mechanochemistry. It is, however, still not fully understood how photochemical reactions, which are often accompanied by molecular motion, proceed in confined and crystalline environments. Here we show that thin films of azobenzene trimers exhibit high structural order and determine the crystallographic unit cell. We demonstrate that the thin film can be switched partially reversibly between a crystalline and an amorphous phase...
August 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28807799/the-influence-of-yttrium-segregation-dependent-phase-partitioning-and-residual-stresses-on-the-aging-and-fracture-behaviour-of-3y-tzp-ceramics
#2
Dušan Bučevac, Tomaž Kosmač, Andraž Kocjan
The yttrium-segregation-dependent phase partitioning and residual stress development that influence both the aging and the fracture behaviour in 3Y-TZP bioceramics were studied by sintering alumina-free 3Y-TZP, varying the sintering temperature and the time, to yield ceramics with identical grain size distributions, but with different phase compositions. The structure and stability of the resulting tetragonal phases, in the form of transformable, yttria-lean t-ZrO2 (YLZ) and non-transformable, yttria-rich t"-ZrO2 and/or t'-ZrO2 (YRZ), were studied by X-ray diffraction (XRD) and focused ion beam scanning electron microscopy (FIB-SEM)...
August 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28806523/production-of-concentrated-pickering-emulsions-with-narrow-size-distributions-using-stirred-cell-membrane-emulsification
#3
Mohamed Soyeb Manga, David W York
Stirred cell membrane emulsification (SCME) has been employed to prepare concentrated Pickering oil in water emulsions solely stabilized by fumed silica nanoparticles. The optimal conditions under which highly stable and low polydispersity concentrated emulsions using the SCME approach are highlighted. Optimization of the oil flux rates and the paddle stirrer speeds are critical to achieving control over the droplet size and size distribution. Investigating the influence of oil volume fraction highlights the criticality of the initial particle loading in the continuous phase on the final droplet size and polydispersity...
August 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28806521/determination-of-caspase-3-activity-and-its-inhibition-constant-by-combination-of-fluorescence-correlation-spectroscopy-with-a-microwell-chip
#4
Di Su, Xiaocai Hu, Chaoqing Dong, Jicun Ren
Caspase-3 is a key enzyme executing apoptosis during ontogenesis and homeostasis of multicellular organisms, and is a very important and potential drug target in treatment of apoptosis disturbance. So far, no commercial drugs for caspase-3 are available, and it is urgently necessitated to develop an effective method for caspase-3 activity assay and its inhibitor screening. In this paper, we propose a new method for determination of caspase-3 activity and its inhibition constant by combining single molecule fluorescence correlation spectroscopy (FCS) with a microwell chip...
August 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28806292/-optimization-and-standardization-of-the-immunodeficient-mouse-model-for-assessing-fat-grafting-outcomes
#5
Lauren E Kokai, Taraneh L Jones, Russell Silowash, Brian Theisen, Gabriella DiBernardo, Andrew Lu, Bowen Yi, Kacey G Marra, J Peter Rubin
BACKGROUND: Animal models are often used to assess interventions that might improve fat grafting outcomes, however, there is great variability in the models. We sought to determine the predictive value of the immunocompromised mouse model for fat grafting so that experiments could be standardized and optimized. METHODS: Human lipoaspirate injections at different volumes and time points were assessed in a nude mouse model and compared with control injections of non-viable fat...
August 3, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28805876/few-layered-mos2-c-with-expanding-d-spacing-as-a-high-performance-anode-for-sodium-ion-batteries
#6
Peng Zhang, Furong Qin, Lei Zou, Mengran Wang, Kai Zhang, Yanqing Lai, Jie Li
Sodium-ion batteries (SIBs) show great potential as alternative energy storage devices for next generation energy storage systems due to the deficiency of lithium resources. MoS2 is a promising anode material for SIBs due to its high theoretical sodium storage capability and large interspace for accommodating sodium ions with a larger ionic radius than lithium ions. However, bulk MoS2 exhibits a sluggish kinetics for the intercalation-deintercalation of sodium ions and large volume expansion, which result in poor cyclability and rate performance...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28802667/different-approaches-to-modeling-analysis-of-mitochondrial-swelling
#7
REVIEW
Sabzali Javadov, Xavier Chapa-Dubocq, Vladimir Makarov
Mitochondria are critical players involved in both cell life and death through multiple pathways. Structural integrity, metabolism and function of mitochondria are regulated by matrix volume due to physiological changes of ion homeostasis in cellular cytoplasm and mitochondria. Ca(2+) and K(+) presumably play a critical role in physiological and pathological swelling of mitochondria when increased uptake (influx)/decreased release (efflux) of these ions enhances osmotic pressure accompanied by high water accumulation in the matrix...
August 9, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28801555/electrochemically-anodized-porous-silicon-towards-simple-and-affordable-anode-material-for-li-ion-batteries
#8
T Ikonen, T Nissinen, E Pohjalainen, O Sorsa, T Kallio, V-P Lehto
Silicon is being increasingly studied as the next-generation anode material for Li-ion batteries because of its ten times higher gravimetric capacity compared with the widely-used graphite. While nanoparticles and other nanostructured silicon materials often exhibit good cyclability, their volumetric capacity tends to be worse or similar than that of graphite. Furthermore, these materials are commonly complicated and expensive to produce. An effortless way to produce nanostructured silicon is electrochemical anodization...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800778/effects-of-intraoperative-peep-optimization-on-postoperative-pulmonary-complications-and-the-inflammatory-response-study-protocol-for-a-randomized-controlled-trial
#9
Zoltán Ruszkai, Erika Kiss, Ildikó László, Fanni Gyura, Erika Surány, Péter Töhötöm Bartha, Gergely Péter Bokrétás, Edit Rácz, István Buzogány, Zoltán Bajory, Erzsébet Hajdú, Zsolt Molnár
BACKGROUND: Patients undergoing general anesthesia and mechanical ventilation during major abdominal surgery commonly develop pulmonary atelectasis and/or hyperdistention of the lungs. Recent studies show benefits of lung-protective mechanical ventilation with the use of low tidal volumes, a moderate level of positive end-expiratory pressure (PEEP) and regular alveolar recruitment maneuvers during general anesthesia, even in patients with healthy lungs. The purpose of this clinical trial is to evaluate the effects of intraoperative lung-protective mechanical ventilation, using individualized PEEP values, on postoperative pulmonary complications and the inflammatory response...
August 11, 2017: Trials
https://www.readbyqxmd.com/read/28800741/erythrocyte-depletion-from-bone-marrow-performance-evaluation-after-50-clinical-scale-depletions-with-spectra-optia-bmc
#10
Soo-Zin Kim-Wanner, Gesine Bug, Juliane Steinmann, Salem Ajib, Nadine Sorg, Carolin Poppe, Milica Bunos, Eva Wingenfeld, Christiane Hümmer, Beate Luxembourg, Erhard Seifried, Halvard Bonig
BACKGROUND: Red blood cell (RBC) depletion is a standard graft manipulation technique for ABO-incompatible bone marrow (BM) transplants. The BM processing module for Spectra Optia, "BMC", was previously introduced. We here report the largest series to date of routine quality data after performing 50 clinical-scale RBC-depletions. METHODS: Fifty successive RBC-depletions from autologous (n = 5) and allogeneic (n = 45) BM transplants were performed with the Spectra Optia BMC apheresis suite...
August 11, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28799383/focus-nucleation-kinetics-of-shear-bands-in-metallic-glass
#11
J Q Wang, J H Perepezko
The development of shear bands is recognized as the primary mechanism in controlling the plastic deformability of metallic glasses. However, the kinetics of the nucleation of shear bands has received limited attention. The nucleation of shear bands in metallic glasses (MG) can be investigated using a nanoindentation method to monitor the development of the first pop-in event that is a signature of shear band nucleation. The analysis of a statistically significant number of first pop-in events demonstrates the stochastic behavior that is characteristic of nucleation and reveals a multimodal behavior associated with local spatial heterogeneities...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28799051/measuring-the-internal-concentration-of-volatile-organic-compounds-in-small-organisms-using-micro-quechers-coupled-to-lvi-gc-ms-ms
#12
Denise Kurth, Martin Krauss, Tobias Schulze, Werner Brack
There is an increasing demand for analytical tools to measure the internal concentrations of xenobiotic pollutants in small organisms. Such tools are required to determine exposure in ecotoxicological studies yet avoid sophisticated clean-up and enrichment techniques or large-scale experimental design. Thus, this paper presents a modified QuEChERS method coupled to gas chromatography tandem mass spectrometry (GC-MS/MS) for small volume organic samples. Ten zebrafish (Danio rerio) embryos were exposed to a 46-compound mixture at 10 ng/mL...
August 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28795384/contribution-of-hepatobiliary-scintigraphy-in-assessing-alpps-most-suited-timing
#13
Stéphanie Truant, Clio Baillet, Anne Claire Deshorgue, Mehdi El Amrani, Damien Huglo, François-René Pruvot
To reduce post-hepatectomy liver failure (PHLF), associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) has been recently developed for patients with a limited future remnant liver (FRL). Nevertheless, high morbi-mortality rates have been reported . The current study aimed to analyze the kinetics of FRL function in patients who were offered ALPPS. Serial SPECT (99 m)Tc-mebrofenin hepatobiliary scintigraphy (HBS) was performed in all patients before and after surgery as well as at inter-stage to quantitatively assess hepatic function [total liver (TL) and FRL]...
August 9, 2017: Updates in Surgery
https://www.readbyqxmd.com/read/28792356/kinetic-evaluation-and-test-retest-reproducibility-of-11-c-ucb-j-a-novel-radioligand-for-positron-emission-tomography-imaging-of-synaptic-vesicle-glycoprotein-2a-in-humans
#14
Sjoerd J Finnema, Nabeel B Nabulsi, Joël Mercier, Shu-Fei Lin, Ming-Kai Chen, David Matuskey, Jean-Dominique Gallezot, Shannan Henry, Jonas Hannestad, Yiyun Huang, Richard E Carson
Synaptic vesicle glycoprotein 2A (SV2A) is ubiquitously present in presynaptic terminals. Here we report kinetic modeling and test-retest reproducibility assessment of the SV2A positron emission tomography (PET) radioligand [(11)C]UCB-J in humans. Five volunteers were examined twice on the HRRT after bolus injection of [(11)C]UCB-J. Arterial blood samples were collected for measurements of radiometabolites and free fraction. Regional time-activity curves were analyzed with 1-tissue (1T) and 2-tissue (2T) compartment models to estimate volumes of distribution ( VT)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28791252/prostate-specific-antigen-5-years-following-stereotactic-body-radiation-therapy-for-low-and-intermediate-risk-prostate-cancer-an-ablative-procedure
#15
Shaan Kataria, Harsha Koneru, Shan Guleria, Malika Danner, Marilyn Ayoob, Thomas Yung, Siyuan Lei, Brian T Collins, Simeng Suy, John H Lynch, Thomas Kole, Sean P Collins
BACKGROUND: Our previous work on early PSA kinetics following prostate stereotactic body radiation therapy (SBRT) demonstrated that an initial rapid and then slow PSA decline may result in very low PSA nadirs. This retrospective study sought to evaluate the PSA nadir 5 years following SBRT for low- and intermediate-risk prostate cancer (PCa). METHODS: 65 low- and 80 intermediate-risk PCa patients were treated definitively with SBRT to 35-37.5 Gy in 5 fractions at Georgetown University Hospital between January 2008 and October 2011...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28790979/modeling-the-combined-effect-of-pressure-and-mild-heat-on-the-inactivation-kinetics-of-escherichia-coli-listeria-innocua-and-staphylococcus-aureus-in-black-tiger-shrimp-penaeus-monodon
#16
Barjinder P Kaur, P Srinivasa Rao
The high-pressure inactivation of Escherichia coli, Listeria innocua, and Staphylococcus aureus was studied in black tiger shrimp (Penaeus monodon). The processing parameters examined included pressure (300 to 600 MPa) and temperature (30 to 50°C). In addition, the pressure-hold period (0 to 15 min) was investigated, thus allowing both single-pulse pressure effects (i.e., zero holding time) and pressure-hold effects to be explored. E. coli was found to be the most sensitive strain to single-pulse pressure, followed by L...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28789541/lattice-animals-in-diffusion-limited-binary-colloidal-system
#17
Zakiya Shireen, Sujin B Babu
In a soft matter system, controlling the structure of the amorphous materials has been a key challenge. In this work, we have modeled irreversible diffusion limited cluster aggregation of binary colloids, which serves as a model for chemical gels. Irreversible aggregation of binary colloidal particles leads to the formation of a percolating cluster of one species or both species which are also called bigels. Before the formation of the percolating cluster, the system forms a self-similar structure defined by a fractal dimension...
August 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28783410/adsorption-characteristics-of-trace-levels-of-bromate-in-drinking-water-by-modified-bamboo-based-activated-carbons
#18
Ho-Wen Chen, Yen Hsun Chuang, Cheng-Feng Hsu, Winn-Jung Huang
This study was undertaken to investigate the adsorption kinetics and isotherms of bromate (BrO3(-)) on bamboo charcoals that are activated with nitrogen and water vapor. Bamboo-based activated carbon (AC) was dipped in acid and oxidized in a mixture of potassium permanganate and sulfuric acid. Oxidation treatment considerably improved the physicochemical properties of AC, including purity, pore structure and surface nature, significantly enhancing BrO3(-) adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO3(-) adsorption...
August 7, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28782782/thermodynamic-stability-of-worm-like-micelle-solutions
#19
Karsten Vogtt, Gregory Beaucage, Michael Weaver, Hanqiu Jiang
Worm-like micelles (WLMs) are nano-scale self-assemblies widely used for viscosity enhancement, for drug delivery, and in personal care products. The stability of WLMs under variable ionic and surfactant concentrations is important to applications of these fascinating materials. In this work it is demonstrated that a virial approach can be used to understand and predict WLM stability. A mixed surfactant system consisting of sodium laureth sulfate and cocoamidopropyl betaine was examined using small-angle neutron scattering...
August 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/28782732/nanoporous-au-ag-shell-with-fast-kinetics-integrating-chemical-and-plasmonic-catalysis
#20
Wenpeng Yang, Ke Wu, Weimin Yang, Hailing Wang, Xianglong Lv, Lihua Qian, Tianshui Yu, Zengquan Li, Xiangji Zhou, Godfrey Okumu Barasa, S L Yuan, Yingtao Jiang, Zhilin Yang
Nanoporous noble metals and alloys are widely utilized as efficient catalysts, because they have high surface-to-volume ratios for surfficient active sites and induce molecule polarization through plasmon excitation as well. Herein we demonstrate one approach to fabricate nanoporous Au-Ag shell. Such material represents the dual functions serving as efficient catalysts and high-performance surface-enhanced Raman scattering (SERS) substrate. In-situ spectrum acquisition can track the conversion of p-nitrothiophenol to 4, 4'-dimercapto-azobenzene at ambient temperature...
August 7, 2017: Nanotechnology
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