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https://www.readbyqxmd.com/read/28211932/nanostructured-material-based-biofuel-cells-recent-advances-and-future-prospects
#1
REVIEW
Cui-E Zhao, Panpan Gai, Rongbin Song, Ying Chen, Jianrong Zhang, Jun-Jie Zhu
During the past decade, biofuel cells (BFCs) have emerged as an emerging technology on account of their ability to directly generate electricity from biologically renewable catalysts and fuels. Due to the boost in nanotechnology, significant advances have been accomplished in BFCs. Although it is still challenging to promote the performance of BFCs, adopting nanostructured materials for BFC construction has been extensively proposed as an effective and promising strategy to achieve high energy production. In this review, we presented the major novel nanostructured materials applied for BFCs and highlighted the breakthroughs in this field...
February 17, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28211681/proton-coupled-electron-transfer-and-the-linear-approximation-for-coupling-to-the-donor-acceptor-distance-fluctuations
#2
Bridget Salna, Abdelkrim Benabbas, Paul M Champion
The often-used "linear approximation" for treating the coupling of donor-acceptor (D-A) distance fluctuations to proton-coupled electron transfer tunneling reactions, is systematically examined. The accuracy of this approximation is found to depend upon the potential energy surfaces that are used to describe both the tunneling particle vibrations and the D-A coordinate probability distribution. A harmonic treatment of both the tunneling particle and the D-A coordinates results in a significant breakdown of the linear approximation when the width of the D-A distribution exceeds ~0...
February 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28209192/learning-from-2523-trauma-deaths-in-india-opportunities-to-prevent-in-hospital-deaths
#3
Nobhojit Roy, Deepa Kizhakke Veetil, Monty Uttam Khajanchi, Vineet Kumar, Harris Solomon, Jyoti Kamble, Debojit Basak, Göran Tomson, Johan von Schreeb
BACKGROUND: A systematic analysis of trauma deaths is a step towards trauma quality improvement in Indian hospitals. This study estimates the magnitude of preventable trauma deaths in five Indian hospitals, and uses a peer-review process to identify opportunities for improvement (OFI) in trauma care delivery. METHODS: All trauma deaths that occurred within 30 days of hospitalization in five urban university hospitals in India were retrospectively abstracted for demography, mechanism of injury, transfer status, injury description by clinical, investigation and operative findings...
February 16, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28209133/house-spider-genome-uncovers-evolutionary-shifts-in-the-diversity-and-expression-of-black-widow-venom-proteins-associated-with-extreme-toxicity
#4
Kerry L Gendreau, Robert A Haney, Evelyn E Schwager, Torsten Wierschin, Mario Stanke, Stephen Richards, Jessica E Garb
BACKGROUND: Black widow spiders are infamous for their neurotoxic venom, which can cause extreme and long-lasting pain. This unusual venom is dominated by latrotoxins and latrodectins, two protein families virtually unknown outside of the black widow genus Latrodectus, that are difficult to study given the paucity of spider genomes. Using tissue-, sex- and stage-specific expression data, we analyzed the recently sequenced genome of the house spider (Parasteatoda tepidariorum), a close relative of black widows, to investigate latrotoxin and latrodectin diversity, expression and evolution...
February 16, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28208367/radiative-transfer-dynamo-effect
#5
Vadim R Munirov, Nathaniel J Fisch
Magnetic fields in rotating and radiating astrophysical plasma can be produced due to a radiative interaction between plasma layers moving relative to each other. The efficiency of current drive, and with it the associated dynamo effect, is considered in a number of limits. It is shown here, however, that predictions for these generated magnetic fields can be significantly higher when kinetic effects, previously neglected, are taken into account.
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28201912/free-energy-functionals-for-polarization-fluctuations-pekar-factor-revisited
#6
Mohammadhasan Dinpajooh, Marshall D Newton, Dmitry V Matyushov
The separation of slow nuclear and fast electronic polarization in problems related to electron mobility in polarizable media was considered by Pekar 70 years ago. Within dielectric continuum models, this separation leads to the Pekar factor in the free energy of solvation by the nuclear degrees of freedom. The main qualitative prediction of Pekar's perspective is a significant, by about a factor of two, drop of the nuclear solvation free energy compared to the total (electronic plus nuclear) free energy of solvation...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28198627/intermode-coupling-drives-the-irreversible-tautomerization-in-porphycene-on-copper-111-induced-by-scanning-tunnelling-microscopy
#7
Dino Novko, María Blanco-Rey, Jean Christophe Tremblay
In this contribution, we develop a nonadiabatic theory that explains, from first-principles, the recently reported irreversible trans → cis tautomerization of porphycene on Cu(111) induced by a scanning tunnelling microscope at finite bias. The inelastic contribution to the STM current is found to excite a large number of skeletal vibrational modes of the molecule, thereby inducing a deformation of the potential energy landscape along the hydrogen transfer coordinate. Above a threshold bias, the stability of the tautomers is reversed, which indirectly drives the reaction via intermode coupling...
February 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28198578/stories-of-change-the-text-analysis-of-handovers-in-an-italian-psychiatric-residential-care-home
#8
M Accordini, E Saita, F Irtelli, M Buratti, G Saluto
: Handovers assure a timely and correct information transfer while socializing workers to the service's culture, however no study describes them as instruments to document organizational change and only a few have focused on psychiatric settings. AIM: To investigate the change in the culture of an Italian psychiatric residential care home as perceived by its Mental Health Workers (MHWs) over the course of two decades. METHOD: Emotional Text Analysis (ETA) was used to analyze the MHWs' handovers completed from 1990 to 2011...
February 15, 2017: Journal of Psychiatric and Mental Health Nursing
https://www.readbyqxmd.com/read/28198359/climatically-sensitive-transfer-of-iron-to-maritime-antarctic-ecosystems-by-surface-runoff
#9
Andy Hodson, Aga Nowak, Marie Sabacka, Anne Jungblut, Francisco Navarro, David Pearce, María Luisa Ávila-Jiménez, Peter Convey, Gonçalo Vieira
Iron supplied by glacial weathering results in pronounced hotspots of biological production in an otherwise iron-limited Southern Ocean Ecosystem. However, glacial iron inputs are thought to be dominated by icebergs. Here we show that surface runoff from three island groups of the maritime Antarctic exports more filterable (<0.45 μm) iron (6-81 kg km(-2) a(-1)) than icebergs (0.0-1.2 kg km(-2) a(-1)). Glacier-fed streams also export more acid-soluble iron (27.0-18,500 kg km(-2) a(-1)) associated with suspended sediment than icebergs (0-241 kg km(-2) a(-1))...
February 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28195076/energy-level-alignment-at-planar-organic-heterojunctions-influence-of-contact-doping-and-molecular-orientation
#10
Andreas Opitz
Planar organic heterojunctions are widely used in photovoltaic cells, light-emitting diodes, and bilayer field-effect transistors. The energy level alignment in the devices plays an important role in obtaining the aspired gap arrangement. Additionally, the π-orbital overlap between the involved molecules defines e.g. the charge-separation efficiency in solar cells due to charge-transfer effects. To account for both aspects, direct/inverse photoemission spectroscopy and near edge x-ray absorption fine structure spectroscopy were used to determine the energy level landscape and the molecular orientation at prototypical planar organic heterojunctions...
February 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28194713/use-of-compressive-osseointegration-endoprostheses-for-massive-bone-loss-from-tumor-and-failed-arthroplasty-a-viable-option-in-the-upper-extremity
#11
Krista A Goulding, Adam Schwartz, Steven J Hattrup, R Lor Randall, Donald Lee, Damian M Rispoli, Daniel M Lerman, Christopher Beauchamp
BACKGROUND: Endoprostheses using principles of compressive osseointegration have shown good survivorship in several studies involving the lower extremity; however, no series to our knowledge have documented the use of this technology in the management of massive bone loss in the upper limb. QUESTIONS/PURPOSES: (1) What proportion of upper extremity implants using compressive osseointegration fixation principles achieved durable short-term fixation, and what were the modes of failure? (2) What surgical complications resulted from reconstruction using this technique? METHODS: A multiinstitutional retrospective review identified nine patients (five women; four men) who underwent 13 endoprosthetic replacements between 2003 and 2014 using compressive osseointegration (Compliant(®) Pre-stress Device [CPS]; Biomet Inc, Warsaw, IN, USA) in the upper extremity, including two proximal humeri, two humeral diaphyses, seven distal humeri, and two proximal ulna...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28194689/exploring-physician-perspectives-of-residency-holdover-handoffs-a-qualitative-study-to-understand-an-increasingly-important-type-of-handoff
#12
Jonathan A Duong, Trevor P Jensen, Sasha Morduchowicz, Michelle Mourad, James D Harrison, Sumant R Ranji
BACKGROUND: The term "holdover admissions" refers to patients admitted by an overnight physician and whose care is then transferred to a new primary team the next morning. Descriptions of the holdover process in internal medicine are sparse. OBJECTIVE: To identify important factors affecting the quality of holdover handoffs at an internal medicine (IM) residency program and to compare them to previously identified factors for other handoffs. DESIGN: We undertook a qualitative study using structured focus groups and interviews...
February 13, 2017: Journal of General Internal Medicine
https://www.readbyqxmd.com/read/28190573/stable-sulfur-isotopes-identify-habitat-specific-foraging-and-mercury-exposure-in-a-highly-mobile-fish-community
#13
Meghan K Carr, Timothy D Jardine, Lorne E Doig, Paul D Jones, Lalita Bharadwaj, Brett Tendler, John Chételat, Pete Cott, Karl-Erich Lindenschmidt
Tracking the uptake and transfer of toxic chemicals, such as mercury (Hg), in aquatic systems is challenging when many top predators are highly mobile and may therefore be exposed to chemicals in areas other than their location of capture, confounding interpretation of bioaccumulation trends. Here we show how the application of a less commonly used ecological tracer, stable sulfur isotope ratios ((34)S/(32)S, or δ(34)S), in a large river-delta-lake complex in northern Canada allows differentiation of resident from migrant fishes, beyond what was possible with more conventional (13)C/(12)C and (15)N/(14)N measurements...
February 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28188294/understanding-the-fret-signatures-of-interacting-membrane-proteins
#14
Christopher King, Valerica Raicu, Kalina Hristova
Forster Resonant Energy Transfer (FRET) is an indispensable experimental tool for studying membrane proteins. Currently, two models are available for researchers to determine the oligomerization state of membrane proteins in a static quenching FRET experiment: the model of Veatch and Stryer derived in 1977, and the Kinetic Theory-based model for intra-oligomeric FRET, derived in 2007. Because of confinement in two-dimensions, a substantial amount of FRET is generated by energy transfer between fluorophores located in separate oligomers in the 2-D bilayer...
February 9, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28187427/genomic-islands-an-overview-of-current-software-and-future-improvements
#15
Siomar de Castro Soares, Letícia de Castro Oliveira, Arun Kumar Jaiswal, Vasco Azevedo
Microbes are highly diverse and widely distributed organisms. They account for ~60% of Earth’s biomass and new predictions point for the existence of 1011 to 1012 species, which are constantly sharing genes through several different mechanisms. Genomic Islands (GI) are critical in this context, as they are large regions acquired through horizontal gene transfer. Also, they present common features like genomic signature deviation, transposase genes, flanking tRNAs and insertion sequences. GIs carry large numbers of genes related to specific lifestyle and are commonly classified in Pathogenicity, Resistance, Metabolic or Symbiotic Islands...
December 22, 2016: Journal of Integrative Bioinformatics
https://www.readbyqxmd.com/read/28186521/diverging-effects-of-isotopic-fractionation-upon-molecular-diffusion-of-noble-gases-in-water-mechanistic-insights-through-ab-initio-molecular-dynamics-simulations
#16
Halua Pinto de Magalhães, Matthias S Brennwald, Rolf Kipfer
Atmospheric noble gases are routinely used as natural tracers to analyze gas transfer processes in aquatic systems. Their isotopic ratios can be employed to discriminate between different physical transport mechanisms by comparison to the unfractionated atmospheric isotope composition. In many applications of aquatic systems molecular diffusion was thought to cause a mass dependent fractionation of noble gases and their isotopes according to the square root ratio of their masses. However, recent experiments focusing on isotopic fractionation within a single element challenged this broadly accepted assumption...
February 10, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28186453/effects-of-distance-and-transport-method-on-intervention-and-mortality-in-aneurysmal-subarachnoid-hemorrhage
#17
Jonathan Weyhenmeyer, Cristian F Guandique, Adam Leibold, Stephen Lehnert, Jonathan Parish, Woody Han, Chad Tuchek, Janit Pandya, Thomas Leipzig, Troy Payner, Andrew DeNardo, John Scott, Aaron A Cohen-Gadol
OBJECTIVE Most patients suffering from aneurysmal subarachnoid hemorrhage (aSAH) initially present to a hospital that lacks a neurosurgical unit. These patients require interhospital transfer (IHT) to tertiary facilities capable of multidisciplinary neurosurgical intervention. Yet, little is known about the effects of IHT on the outcomes of patients suffering from aSAH. In this study, the authors examined the effects of IHT and transport method on the timing of treatment, rebleed rates, and overall outcomes of patients who have experienced aSAH...
February 10, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28185733/evaluating-the-potential-health-risk-of-toxic-trace-elements-in-vegetables-accounting-for-variations-in-soil-factors
#18
Yang Yang, Weiping Chen, Meie Wang, Yanling Li, Chi Peng
Vegetable crop consumption is one of the main sources of dietary exposure to toxic trace elements (TEs). A paired survey of soil and vegetable samples was conducted in 589 agricultural sites in the Youxian prefecture, southern China, to investigate the effect of soil factors on the accumulation of arsenic, cadmium, mercury, and lead in different vegetables. A site-specific model was developed to estimate the health risk from vegetable consumption. The TE concentration varied in different plant species, and rape can be cultivated in contaminated areas for its potential use in restricting the transfer of TE from soil to edible plant parts...
February 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28182605/assisted-reproductive-technology-surveillance-united-states-2014
#19
Saswati Sunderam, Dmitry M Kissin, Sara B Crawford, Suzanne G Folger, Denise J Jamieson, Lee Warner, Wanda D Barfield
PROBLEM/CONDITION: Since the first U.S. infant conceived with assisted reproductive technology (ART) was born in 1981, both the use of ART and the number of fertility clinics providing ART services have increased steadily in the United States. ART includes fertility treatments in which eggs or embryos are handled in the laboratory (i.e., in vitro fertilization [IVF] and related procedures). Women who undergo ART procedures are more likely than women who conceive naturally to deliver multiple-birth infants...
February 10, 2017: MMWR. Surveillance Summaries: Morbidity and Mortality Weekly Report. Surveillance Summaries
https://www.readbyqxmd.com/read/28182009/hetero-oligomerization-between-the-tnf-receptor-superfamily-members-cd40-fas-and-trailr2-modulate-cd40-signalling
#20
Cristian R Smulski, Marion Decossas, Neila Chekkat, Julien Beyrath, Laure Willen, Gilles Guichard, Raquel Lorenzetti, Marta Rizzi, Hermann Eibel, Pascal Schneider, Sylvie Fournel
TNF receptor superfamily members (TNFRSF) such as CD40, Fas and TRAIL receptor 2 (TRAILR2) participate to the adaptive immune response by eliciting survival, proliferation, differentiation and/or cell death signals. The balance between these signals determines the fate of the immune response. It was previously reported that these receptors are able to self-assemble in the absence of ligand through their extracellular regions. However, the role of this oligomerization is not well understood, and none of the proposed hypotheses take into account potential hetero-association of receptors...
February 9, 2017: Cell Death & Disease
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