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https://www.readbyqxmd.com/read/28651385/enhancement-of-catalytic-activity-of-reduced-graphene-oxide-via-transition-metal-doping-strategy
#1
Hangil Lee, Jung A Hong
To compare the catalytic oxidation activities of reduced graphene oxide (rGO) and rGO samples doped with five different transition metals (TM-rGO), we determine their effects on the oxidation of L-cysteine (Cys) in aqueous solution by performing electrochemistry (EC) measurements and on the photocatalytic oxidation of Cys by using high-resolution photoemission spectroscopy (HRPES) under UV illumination. Our results show that Cr-, Fe-, and Co-doped rGO with 3+ charge states (stable oxide forms: Cr(3+), Fe(3+), and Co(3+)) exhibit enhanced catalytic activities that are due to the charge states of the doped metal ions as we compare them with Cr-, Fe-, and Co-doped rGO with 2+ charge states...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28651322/ozonation-of-tannic-acid-to-model-biomass-pretreatment-for-bioethanol-production
#2
Roi Peretz, Yoram Gerchman, Hadas Mamane
Lignocellulosic biomass is a promising feedstock for ethanol production, but lignin, a polyphenol, hampers the use of enzymes for its saccharification; pretreatment is thus key to preparing such feedstock. Ozonation was previously demonstrated as an effective pretreatment, but claimed to be uneconomical due to the assumed need for lignin mineralization. We analyzed, for the first time, ozonation of highly concentrated tannic acid (TA) solution (60g/L) as a lignin model. Most of the TA disappeared within 3.5h, following triple-phase kinetics with two transition points: at 7min and 60min of ozonation for 0...
June 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651249/administration-of-the-mitochondrial-permeability-transition-pore-inhibitor-tro40303-prior-to-primary-percutaneous-coronary-intervention-does-not-affect-the-levels-of-pro-inflammatory-cytokines-or-acute-phase-proteins
#3
Noreen Butt, Lena K Bache-Mathiesen, Jan Erik Nordrehaug, Vegard Tuseth, Peter Scott Munk, Vernon Bonarjee, Trygve Sundby Hall, Svend Eggert Jensen, Sigrun Halvorsen, Huseyin Firat, Dan Atar, Alf Inge Larsen
OBJECTIVES: In the MITOCARE study, reperfusion injury was not prevented after administration of the mitochondrial permeability transition pore (mPTP) opening inhibitor, TRO40303, in patients with ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (pPCI). The effects of TRO40303 on pro-inflammatory cytokines and acute-phase proteins were assessed. METHODS: STEMI patients (n = 163, mean age 62 years) with chest pain within 6 h before admission for pPCI were randomized to intravenous bolus of TRO40303 (n = 83) or placebo (n = 80) prior to reperfusion...
June 27, 2017: Cardiology
https://www.readbyqxmd.com/read/28651215/anticipatory-postural-adjustment-patterns-during-gait-initiation-across-the-adult-lifespan
#4
Chiahao Lu, Sommer L Amundsen Huffmaster, Jack C Harvey, Colum D MacKinnon
Gait initiation involves a complex sequence of anticipatory postural adjustments (APAs) during the transition from steady state standing to forward locomotion. APAs have four core components that function to accelerate the center of mass forwards and towards the initial single-support stance limb. These components include loading of the initial step leg, unloading of the initial stance leg, and excursion of the center of pressure in the posterior and lateral (towards the stepping leg) directions. This study examined the incidence, magnitude, and timing of these components and how they change across the lifespan (ages 20-79)...
June 16, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28651203/carbon-coated-zno-mat-passivation-by-atomic-layer-deposited-hfo2-as-an-anode-material-for-lithium-ion-batteries
#5
Mi-Hee Jung
ZnO has had little consideration as an anode material in lithium-ion batteries compared with other transition-metal oxides due to its inherent poor electrical conductivity and large volume expansion upon cycling and pulverization of ZnO-based electrodes. A logical design and facile synthesis of ZnO with well-controlled particle sizes and a specific morphology is essential to improving the performance of ZnO in lithium-ion batteries. In this paper, a simple approach is reported that uses a cation surfactant and a chelating agent to synthesize three-dimensional hierarchical nanostructured carbon-coated ZnO mats, in which the ZnO mats are composed of stacked individual ZnO nanowires and form well-defined nanoporous structures with high surface areas...
June 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28651057/how-to-identify-plasmons-from-the-optical-response-of-nanostructures
#6
Runmin Zhang, Luca Bursi, Joel D Cox, Yao Cui, Caroline M Krauter, Alessandro Alabastri, Alejandro Manjavacas, Arrigo Calzolari, Stefano Corni, Elisa Molinari, Emily A Carter, F Javier Garcia de Abajo, Hui Zhang, Peter Nordlander
A promising trend in plasmonics involves shrinking the size of plasmon-supporting structures down to a few nanometers, thus enabling control over light-matter interaction at extreme-subwavelength scales. In this limit, quantum-mechanical effects, such as nonlocal screening and size quantization, strongly affect the plasmonic response, rendering it substantially different from classical predictions. For very small clusters and molecules, collective plasmonic modes are hard to distinguish from other excitations such as single-electron transitions...
June 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28651054/importance-and-nature-of-short-range-excitonic-interactions-in-light-harvesting-complexes-and-organic-semiconductors
#7
Rocco Peter Fornari, Patrick Rowe, Daniele Padula, Alessandro Troisi
The singlet excitonic coupling between many pairs of chromophores is evaluated in three different Light Harvesting Complexes (LHCs) and two organic semiconductors (amorphous and crystalline). This large database of structures is used to assess the relative importance of short-range (exchange, overlap, orbital) and long-range (Coulombic) excitonic coupling. We find that atomic transition charges can introduce systematic errors on the Coulombic coupling and that the dipole-dipole interaction fails to capture the true Coulombic coupling even at intermolecular distances of up to 50 Å...
June 26, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28651045/photoinduced-charge-transfer-versus-fragmentation-pathways-in-lanthanum-cyclopentadienyl-complexes
#8
Yulun Han, Qingguo Meng, Bakhtiyor Rasulev, P Stanley May, Mary T Berry, Dmitri S Kilin
This study compares two competing pathways of photoexcitations in gas-phase metal-organic complexes: first, a sequence of phonon-assisted electronic transitions leading to dissipation of the energy of photoexcitations and second, a sequence of light-driven electronic transitions leading to photolysis. Phonon-assisted charge carrier dynamics is investigated by combination of the density matrix formalism and on-the-fly nonadiabatic couplings. Light-driven fragmentation is modeled by a time-dependent excited-state molecular dynamics (TDESMD) algorithm based on Rabi theory and principles similar to the trajectory surface hopping approximation...
June 26, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28651043/visualizing-the-contributions-of-virtual-states-to-two-photon-absorption-cross-sections-by-natural-transition-orbitals-of-response-transition-density-matrices
#9
Kaushik D Nanda, Anna I Krylov
Observables such as two-photon absorption cross-sections cannot be computed from the wave functions of the initial and final states alone because of their nonlinear nature. Rather, they depend on the entire manifold of the excited states, which follows from the familiar sum-over-states expressions of second- and higher-order properties. Consequently, the interpretation of the computed nonlinear optical properties in terms of molecular orbitals is not straightforward and usually relies on approximate few-states models...
June 26, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28651010/macrophages-but-not-neutrophils-are-critical-for-proliferation-of-burkholderia-cenocepacia-and-ensuing-host-damaging-inflammation
#10
Jennifer Mesureur, Joana R Feliciano, Nelly Wagner, Margarida C Gomes, Lili Zhang, Monica Blanco-Gonzalez, Michiel van der Vaart, David O'Callaghan, Annemarie H Meijer, Annette C Vergunst
Bacteria of the Burkholderia cepacia complex (Bcc) can cause devastating pulmonary infections in cystic fibrosis (CF) patients, yet the precise mechanisms underlying inflammation, recurrent exacerbations and transition from chronic stages to acute infection and septicemia are not known. Bcc bacteria are generally believed to have a predominant extracellular biofilm life style in infected CF lungs, similar to Pseudomonas aeruginosa, but this has been challenged by clinical observations which show Bcc bacteria predominantly in alveolar macrophages...
June 26, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28651004/a-human-endogenous-retrovirus-derived-gene-that-can-contribute-to-oncogenesis-by-activating-the-erk-pathway-and-inducing-migration-and-invasion
#11
Cécile Lemaître, Jhen Tsang, Caroline Bireau, Thierry Heidmann, Marie Dewannieux
Endogenous retroviruses are cellular genes of retroviral origin captured by their host during the course of evolution and represent around 8% of the human genome. Although most are defective and transcriptionally silenced, some are still able to generate retroviral-like particles and proteins. Among these, the HERV-K(HML2) family is remarkable since its members have amplified relatively recently and many of them still have full length coding genes. Furthermore, they are induced in cancers, especially in melanoma, breast cancer and germ cell tumours, where viral particles, as well as the envelope protein (Env), can be detected...
June 26, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28650990/identification-of-soil-p-fractions-that-are-associated-with-p-loss-from-surface-runoff-under-various-cropping-systems-and-fertilizer-rates-on-sloped-farmland
#12
Xinghua Li, Baona Wang, Tewu Yang, Duanwei Zhu, Zhongnan Nie, Junchi Xu
Soil phosphorus (P) fractions and runoff P concentration were measured to understand the fate of soil P entering surface runoff water during summer cropping season of different double cropping systems under two fertilizer regimes. The dominant form of runoff P was particulate P (PP). Runoff total P (TP) was higher at the vegetative growth stage and lower at the crop reproductive stage. TP and PP were derived mainly from soil Olsen-P, Al-P and Fe-P and amounts increased with sediment content in runoff water...
2017: PloS One
https://www.readbyqxmd.com/read/28650917/long-term-changes-in-left-ventricular-mass-echocardiographic-findings-from-a-general-population
#13
Cesare Cuspidi, Fosca Quarti, Raffaella Dell'Oro, Rita Facchetti, Michele Bombelli, Carla Sala, Marijana Tadic, Guido Grassi, Giuseppe Mancia
AIM: We sought to assess the long-term changes in left ventricular (LV) mass in a population-based sample, focusing on new onset, persistence, regression and severity of LV hypertrophy (LVH), as well as on the demographic and clinical variables independently related to this dynamic process. METHODS: A total of 1113 participants with measurable echocardiographic parameters at baseline and after a 10-year follow-up were included in the analysis. Cut points for LVH were derived from current echocardiographic guidelines...
June 24, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28650870/managing-knowledge-in-transitions-experiences-of-health-care-leaders-in-succession-planning
#14
Shannon L Sibbald, C Nadine Wathen, Anita Kothari
Effective and efficient methods of succession planning are integral to the success of organizations across the health care system. We explored current health organizations' senior leadership transition processes. Participants were in senior level leadership and decision-making positions in hospitals within Ontario, Canada. Most of the participants did not have formal transition plans and instead relied on the human resources department to plan for succession. We discuss these processes through three themes: (1) preplanning for a transition, (2) the transition process, and (3) barriers to successful transitions...
June 23, 2017: Health Care Manager
https://www.readbyqxmd.com/read/28650799/learning-the-personalized-intransitive-preferences-of-images
#15
Jun Chen, Chaokun Wang, Jianmin Wang, Xiang Ying, Xuecheng Wang
Most of the previous studies on the user preferences assume that there is a personal transitive preference ranking of the consumable media like images. For example, the transitivity of preferences is one of the most important assumptions in the recommender system research. However, the intransitive relations have also been widely observed, such as the win/loss relations in online video games, in sport matches, and even in rock-paper-scissors games. It is also found that different subjects demonstrate the personalized intransitive preferences in the pairwise comparisons between the applicants for college admission...
September 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28650786/alveolar-fracture-caused-by-tooth-extraction-at-home
#16
Fabrício Kitazono de Carvalho, Thaís Aparecida Xavier, Nicole Gonçalves Lima, Alexandra Mussolino de Queiroz, Marcilene Coelho Vinhorte, Paulo Nelson-Filho
Injuries to the teeth and surrounding structures are relatively common. Although traumatic injuries caused by falls or activities related to sports are widely discussed, the same cannot be said regarding accidents arising from non-professional extraction of primary teeth. The present study reports a 6-year-old male child who underwent mandibular alveolar bone fracture during non-professional extraction of his central lower left incisor at home, performed by his 30-year-old aunt. The root of the tooth was with an irregular physiological resorption, which acted as a lever component for the mechanical force applied, leading to bone fracture...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28650703/program-implementation-of-option-b%C3%A2-at-a-president-s-emergency-plan-for-aids-relief-supported-hiv-clinic-improves-clinical-indicators-but-not-retention-in-care-in-mbarara-uganda
#17
Kathleen Miller, Winnie Muyindike, Lynn T Matthews, Michael Kanyesigye, Mark J Siedner
2013 WHO guidelines for prevention of mother to child transmission recommend combination antiretroviral therapy (ART) for all pregnant women, regardless of CD4 count (Option B/B+). We conducted a retrospective analysis of data from a government-operated HIV clinic in Mbarara, Uganda before and after implementation of Option B+ to assess the impact on retention in care. We limited our analysis to women not on ART at the time of their first reported pregnancy with CD4 count >350. We fit regression models to estimate relationships between calendar period (Option A vs...
June 26, 2017: AIDS Patient Care and STDs
https://www.readbyqxmd.com/read/28650698/the-rock-isoforms-differentially-regulate-the-morphological-characteristics-of-carcinoma-cells
#18
Rachel J Jerrell, Mitchell J Leih, Aron Parekh
Rho-associated kinase (ROCK) activity drives cell migration via actomyosin contractility. During invasion, individual cancer cells can transition between two modes of migration, mesenchymal and amoeboid. Changes in ROCK activity can cause a switch between these migration phenotypes which are defined by distinct morphologies. However, recent studies have shown that the ROCK isoforms are not functionally redundant as previously thought. Therefore, it is unclear whether the ROCK isoforms play different roles in regulating migration phenotypes...
June 26, 2017: Small GTPases
https://www.readbyqxmd.com/read/28650679/establishing-maximal-medical-improvement-after-arthroscopic-rotator-cuff-repair
#19
William A Zuke, Timothy S Leroux, Bonnie P Gregory, Austin Black, Brian Forsythe, Anthony A Romeo, Nikhil N Verma
BACKGROUND: As health care transitions from a pay-for-service to a pay-for-performance infrastructure, the value of orthopaedic care must be defined accurately. Significant efforts have been made in defining quality and cost in arthroplasty; however, there remains a lag in ambulatory orthopaedic care. PURPOSE: Two-year follow-up has been a general requirement for reporting outcomes after rotator cuff repair. However, this time requirement has not been established scientifically and is of increasing importance in the era of value-based health care...
June 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28650664/the-dynamical-transition-of-lipid-multi-lamellar-bilayers-as-a-matter-of-cooperativity
#20
Judith Peters, Jérémie Marion, Francesca Natali, Efim Kats, Dominique J Bicout
The present study is the application of a two-state model formerly developed by Bicout, D.J. and and Zaccai, G., Biophys J 2001, 80 (3), 1115-23 1 to describe the dynamical transition exhibited in the atomic mean square displacements of biological samples in terms of dynamic and thermodynamic parameters. Data were obtained by elastic incoherent neutron scattering on 1,2-dimyristoyl-sn-glycero-3-phosphocholine lipid membranes in various hydration states and on one partially per-deuterated lipid membrane. Fitting the data with the model allowed investigating which parts of lipid molecules were mainly involved in the dynamical transition, heads, tails or both...
June 26, 2017: Journal of Physical Chemistry. B
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