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https://www.readbyqxmd.com/read/29673034/structural-reversibility-of-laco1-xcuxo3-followed-by-in-situ-x-ray-diffraction-and-absorption-spectroscopy
#1
Rosa María Pereñiguez Rodríguez, Davide Ferri
Combinations of perovskite-type oxides with transition and precious metals exhibit the remarkable self-regenerable property that could be exploited for numerous practical applications. The objective of the present work was to study the reversibility of structural changes of perovskite-type oxides under cyclic reducing/oxidizing atmosphere by taking advantage of the reducibility of LaCoO3. LaCoO3±δ and LaCo0.8Cu0.2O3±δ were prepared by ultrasonic spray combustion and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS) and temperature programmed reduction (TPR)...
April 19, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29664622/multi-stimuli-responsive-amphiphilic-poly-ester-urethane-nano-assemblies-based-on-l-tyrosine-for-intracellular-drug-delivery-to-cancer-cells
#2
Rajendra Aluri, Sonashree Saxena, Dheeraj Chandra Joshi, Manickam Jayakannan
Multi-stimuli-responsive L-tyrosine based amphiphilic poly(ester-urethane)s nano-carriers were designed and developed, for the first time, to administrate anticancer drugs at cancer tissue environment via thermo-responsiveness and lysosomal enzymatic-biodegradation from single polymer platform. For this purpose, multifunctional L-tyrosine monomer was tailor-made with PEG-lated side chain at the phenolic position along with urethane and carboxylic ester functionalities. Under melt dual ester-urethane polycondensation, the tyrosine-monomer reacted with diols to produce high molecular weight amphiphilic poly(ester-urethane)s...
April 17, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29661319/fabrication-of-ppc-ncc-pva-composites-with-inner-outer-double-constrained-structure-and-improved-glass-transition-temperature
#3
Shaoying Cui, Li Li, Qi Wang
Improving glass transition temperature (Tg ) and mechanical property of the environment-friendly poly(propylene carbonate) via intermacromolecular complexation through hydrogen bonding is attractive and of great importance. A novel and effective strategy to prepare (polypropylene carbonate/nanocrystalline cellulose)/polyvinyl alcohol ((PPC/NCC)/PVA) composites with inner-outer double constrained structure was reported in this work. Outside the PPC phase, PVA, as a strong skeleton at microscale, could constrain the movement of PPC molecular chains by forming hydrogen bonding with PPC at the interface of PPC and PVA phases; inside the PPC phase, the rod-like NCC could restrain the flexible molecular chains of PPC at nanoscale by forming multi-hydrogen bonding with PPC...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29653050/dissolution-of-complex-metal-oxides-from-first-principles-and-thermodynamics-cation-removal-from-the-001-surface-of-li-ni-1-3-mn-1-3-co-1-3-o-2
#4
Joseph Bennett, Diamond Jones, Xu Huang, Robert J Hamers, Sara E Mason
The rapid increase in use of Li-ion batteries in portable electronics has created a pressing need to understand the environmental impact and long-term fate of electonic waste (e-waste) products such as heavy and/or reactive metals. The type of e-waste that we focus on here are the complex metal oxide nanomaterials that compose Li-ion battery cathodes. While in operation the complex metal oxides are in a hermetically sealed container. However, at the end of life, improper disposal can cause structural transformations such as dissolution and metal leaching, resulting in a significant exposure risk to the surrounding environment...
April 13, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29652053/the-interplay-of-nanointerface-curvature-and-calcium-binding-in-weak-polyelectrolyte-coated-nanoparticles
#5
Rikkert J Nap, Estefania Gonzalez Solveyra, Igal Szleifer
When engineering nanomaterials for application in biological systems, it is important to understand how multivalent ions, such as calcium, affect the structural and chemical properties of polymer-modified nanoconstructs. In this work, a recently developed molecular theory was employed to study the effect of surface curvature on the calcium-induced collapse of end-tethered weak polyelectrolytes. In particular, we focused on cylindrical and spherical nanoparticles coated with poly(acrylic acid) in the presence of different amounts of Ca2+ ions...
April 13, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29651485/structural-signature-and-transition-dynamics-of-sb-2-te-3-melt-upon-fast-cooling
#6
Y R Guo, F Dong, C Qiao, J J Wang, S Y Wang, Ming Xu, Y X Zheng, R J Zhang, L Y Chen, C Z Wang, K M Ho
Crystalline Sb2Te3 is widely studied due to its important applications in memory materials and topological insulators. The liquid and amorphous structures of this compound as well as the dynamics upon quenching, however, are yet to be fully understood. In this work, we have systematically studied the dynamical properties and local structure of Sb2Te3 at different temperatures using ab initio molecular dynamics simulations. The calculated structure factors agree well with the experimental results. The atomic number density and mean-squared displacement as a function of temperature clearly indicate three states as the temperature decreases, namely, melt, undercooled liquid and glass state, respectively...
April 13, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29609835/using-a-systems-approach-to-evaluate-a-circulating-nurse-s-work-patterns-and-workflow-disruptions
#7
David M Neyens, Sara Bayramzadeh, Kenneth Catchpole, Anjali Joseph, Kevin Taaffe, Katherina Jurewicz, Amin Khoshkenar, Dee San
The physical environment affects how work is done in operating rooms (OR). The circulating nurse (CN), in particular, requires access to and interacts with materials, equipment, and technology more than other OR team members. Naturalistic study of CN behavior is therefore valuable in assessing how OR space and physical configuration influences work patterns and disruptions. This study evaluated the CNs' work patterns and flow disruptions (FD) by analyzing 25 surgeries across three different ORs. The OR layouts were divided into transitional and functional zones, and the work of CNs was categorized into patient, equipment, material, and information tasks...
March 30, 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29606929/metal-substitution-modulates-the-reactivity-and-extends-the-reaction-scope-of-myoglobin-carbene-transfer-catalysts
#8
Gopeekrishnan Sreenilayam, Eric J Moore, Viktoria Steck, Rudi Fasan
Engineered myoglobins have recently emerged as promising scaffolds for catalyzing carbene-mediated transformations. In this work, we investigated the effect of altering the metal center and its first-sphere coordination environment on the carbene transfer reactivity of myoglobin. To this end, we first established an efficient protocol for the recombinant expression of myoglobin variants incorporating metalloporphyrins with non-native metals, including second- and third-row transition metals (ruthenium, rhodium, iridium)...
June 19, 2017: Advanced Synthesis & Catalysis
https://www.readbyqxmd.com/read/29595143/matrix-stiffness-and-tumor-associated-macrophages-modulate-epithelial-to-mesenchymal-transition-of-human-adenocarcinoma-cells
#9
Marta Alonso-Nocelo, Theresa M Raimondo, Kyle H Vining, Rafael López-López, Maria de la Fuente, David J Mooney
The tumor microenvironment (TME) is gaining increasing attention in oncology, as it is recognized to be functionally important during tumor development and progression. Tumors are heterogeneous tissues that, in addition to tumor cells, contain tumor-associated cell types such as immune cells, fibroblasts, and endothelial cells. These other cells, together with the specific extracellular matrix (ECM), create a permissive environment for tumor growth. While the influence of tumor-infiltrating cells and mechanical properties of the ECM in tumor invasion and progression have been studied separately, their interaction within the complex TME and the epithelial -to-mesenchymal transition (EMT) is still unclear...
March 28, 2018: Biofabrication
https://www.readbyqxmd.com/read/29578499/processing-of-bulk-nanocrystalline-metals-at-the-us-army-research-laboratory
#10
Vincent H Hammond, Billy C Hornbuckle, Anit K Giri, Anthony J Roberts, Thomas L Luckenbaugh, Joseph M Marsico, Scott M Grendahl, Kristopher A Darling
Given their potential for significant property improvements relative to their large grained counterparts, much work has been devoted to the continued development of nanocrystalline metals. Despite these efforts, the transition of these materials from the lab bench to actual applications has been blocked by the inability to produce large scale parts that retain the desired nanocrystalline microstructures. Following the development of a method proven to stabilize the nanosized grain structure to temperatures approaching that of the melting point for the given metal, the US Army Research Laboratory (ARL) has progressed to the next stage in the development of these materials - namely the production of large scale parts suitable for testing and evaluation in a range of relevant test environments...
March 7, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29577834/-do-you-want-to-go-forward-or-do-you-want-to-go-under-men-s-mental-health-in-and-out-of-prison
#11
John L Oliffe, Debra Hanberg, Madeline N Hannan-Leith, Cara Bergen, Ruth Elwood Martin
More than 11 million people are currently imprisoned worldwide, with the vast majority of incarcerated individuals being male. Hypermasculine environments in prison are often tied to men's health risks, and gathering information about mental health is fundamental to improving prison as well as community services. The purpose of the current study was to describe the connections between masculinities and men's mental health among prisoners transitioning into and out of a Canadian federal correctional facility...
March 1, 2018: American Journal of Men's Health
https://www.readbyqxmd.com/read/29575954/ototoxicity-the-radical-drum-beat-and-rhythm-of-cochlear-hair-cell-life-and-death
#12
David V Gauvin, Joshua Yoder, Zachary J Zimmermann, Rachel Tapp
The function and structure of the auditory information processing system establishes a unique sensory environment for the "perfect storm." The battle between life and death pits the cascade of an apoptotic storm, programmed cell death cascades, against simple cell death (necrosis) pathways. Live or die, the free radical biology of oxygen and hydroxylation, and the destruction of transition metal migration through the mechanical gate sensory processes of the hair cell lead to direct access to the cytoplasm, cytoplasmic reticulum, and mitochondria of the inner workings of the hair cells...
January 1, 2018: International Journal of Toxicology
https://www.readbyqxmd.com/read/29569900/selective-determination-of-cr-vi-by-glutaraldehyde-crosslinked-chitosan-polymer-fluorophores
#13
Jieyao Song, Hongjian Zhou, Rui Gao, Yong Zhang, Haimin Zhang, Yunxia Zhang, Guozhong Wang, Po Keung Wong, Huijun Zhao
Selective determination of aquatic chromium is critically important because of the dramatic differences in health and environment impacts by trivalent and hexavalent forms of chromium, however, it is challenging. In this work, for the first time, a non-conjugated polymer fluorophore (GCPF) was synthesized by crosslinking chitosan with glutaralde-hyde via Schiff base reactions and systematically investigated for selective determination of Cr(VI). The results revealed that the synthesized GCPF exhibited excellent photostability and water solubility...
March 23, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29568839/potassium-fluoride-activation-for-the-nucleophilic-fluorination-reaction-using-18-crown-6-2-2-2-cryptand-pentaethylene-glycol-and-comparison-with-the-new-hydro-crown-scaffold-a-theoretical-analysis
#14
Josefredo R Pliego
Activation of potassium fluoride salt for selective and fast nucleophilic fluorination requires its solubilization and stabilization of the respective transition state. This goal can be achieved through control of the nano-environment around the reactants via cation or ion-pair binding catalysis. In this work, six different species were theoretically investigated as promoters and catalysts for nucleophilic fluorination: tri-tert-butanolamine, 18-crown-6, pentaethylene glycol, [2.2.2]-cryptand, and two new hydroxylated crown ethers (hydro-crowns)...
March 23, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29568509/-17-o-solid-state-nmr-spectroscopy-of-a-2-b-2-o-7-oxides-quantitative-isotopic-enrichment-and-spectral-acquisition
#15
Arantxa Fernandes, Robert F Moran, Scott Sneddon, Daniel M Dawson, David McKay, Giulia P M Bignami, Frédéric Blanc, Karl R Whittle, Sharon E Ashbrook
The potential of17 O NMR spectroscopy for the investigation of A2 B2 O7 ceramic oxides important in the encapsulation of radioactive waste is demonstrated, with post-synthetic enrichment by exchange with17 O2 gas. For Y2 Sn2 O7 , Y2 Ti2 O7 and La2 Sn2 O7 pyrochlores, enrichment of the two distinct O species is clearly non quantitative at lower temperatures (∼700 °C and below) and at shorter times, despite these being used in prior work, with preferential enrichment of OA2 B2 favoured over that of OA4 . At higher temperatures, the17 O NMR spectra suggest that quantitative enrichment has been achieved, but the integrated signal intensities do not reflect the crystallographic 1 : 6 (O1 : O2) ratio until corrected for differences in T 1 relaxation rates and, more importantly, the contribution of the satellite transitions...
February 13, 2018: RSC Advances
https://www.readbyqxmd.com/read/29563029/the-subjective-wellbeing-profile-of-the-pretiree-demographic-a-cross-sectional-study
#16
Julie A Pasco, Kara L Holloway, Amanda L Stuart, Lana J Williams, Sharon L Brennan-Olsen, Michael Berk
OBJECTIVES: Pretirees are a demographic interposed between the latter stages of working life and old age. We aimed to characterise subjective wellbeing and lifestyle behaviours for individuals aged in their late-fifties and sixties. STUDY DESIGN: Cross-sectional study of 233 men and 229 women aged 55-69 yr from the Geelong Osteoporosis Study. MAIN OUTCOME MEASURES: Subjective wellbeing assessed using the World Health Organization Quality of Life questionnaire (WHOQOL-BREF, Australia)...
April 2018: Maturitas
https://www.readbyqxmd.com/read/29561622/lipid-based-liquid-crystalline-nanoparticles-facilitate-cytosolic-delivery-of-sirna-via-structural-transformation
#17
Shufang He, Weiwei Fan, Na Wu, Jingjing Zhu, Yunqiu Miao, Xiaran Miao, Feifei Li, Xinxin Zhang, Yong Gan
RNA interference (RNAi) technology has shown great promise for the treatment of cancer and other genetic disorders. Despite the efforts to increase the target tissue distribution, the safe and effective delivery of siRNA to the diseased cells with sufficient cytosolic transport is another critical factor for successful RNAi clinical application. Here, the constructed lipid-based liquid crystalline nanoparticles, called nano-Transformers, can transform the structure in the intracellular acidic environment, and perform high-efficient siRNA delivery for cancer treatment...
March 21, 2018: Nano Letters
https://www.readbyqxmd.com/read/29548234/influence-of-turbulent-mixing-on-critical-behavior-of-directed-percolation-process-effect-of-compressibility
#18
J Honkonen, T Lučivjanský, V Škultéty
Universal behavior is a typical emergent feature of critical systems. A paramount model of the nonequilibrium critical behavior is the directed bond percolation process that exhibits an active-to-absorbing state phase transition in the vicinity of a percolation threshold. Fluctuations of the ambient environment might affect or destroy the universality properties completely. In this work, we assume that the random environment can be described by means of compressible velocity fluctuations. Using field-theoretic models and renormalization group methods, we investigate large-scale and long-time behavior...
February 2018: Physical Review. E
https://www.readbyqxmd.com/read/29547697/atomistic-mechanism-of-large-scale-conformational-transition-in-a-heterodimeric-abc-exporter
#19
Hendrik Göddeke, M Hadi Timachi, Cedric A Hutter, Laura Galazzo, Markus A Seeger, Mikko Karttunen, Enrica Bordignon, Lars V Schäfer
ATP-binding cassette (ABC) transporters are ATP-driven molecular machines, in which ATP binding and hydrolysis in the nucleotide-binding domains (NBDs) is chemo-mechanically coupled to large-scale, alternating access conformational changes in the transmembrane domains (TMDs), ultimately leading to the translocation of substrates across biological membranes. The precise nature of the structural dynamics behind the large-scale conformational transition as well as the coupling of NBD and TMD motions is still unresolved...
March 16, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29546432/factors-affecting-choice-of-sponsoring-institution-for-residency-among-medical-students-in-singapore
#20
Chew Lip Ng, Xuan Dao Liu, Renuka Murali Govind, Jonathan Wei Jian Tan, Shirley Beng Suat Ooi, Sophia Archuleta
INTRODUCTION: Postgraduate medical education in Singapore underwent major transition recently, from a British-style system and accreditation to a competency-based residency programme modelled after the American system. We aimed to identify the relative importance of factors influencing the choice of residency sponsoring institutions (SIs) among medical students during this transition period. METHODS: A questionnaire-based cross-sectional study of Singaporean undergraduate medical students across all years of study was performed in 2011...
March 16, 2018: Singapore Medical Journal
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