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Hans U Stauffer, Sukesh Roy, Jacob B Schmidt, Paul J Wrzesinski, James R Gord
A resonantly enhanced, two-color, femtosecond time-resolved coherent anti-Stokes Raman scattering (CARS) approach is demonstrated and used to explore the nature of the frequency- and time-dependent signals produced by gas-phase nitric oxide (NO). Through careful selection of the input pulse wavelengths, this fully resonant electronically enhanced CARS (FREE-CARS) scheme allows rovibronic-state-resolved observation of time-dependent rovibrational wavepackets propagating on the vibrationally excited ground-state potential energy surface of this diatomic species...
September 28, 2016: Journal of Chemical Physics
R Tiani, L Rongy
The nonlinear dynamics of A + B → C fronts is analyzed both numerically and theoretically in the presence of Marangoni flows, i.e., convective motions driven by surface tension gradients. We consider horizontal aqueous solutions where the three species A, B, and C can affect the surface tension of the solution, thereby driving Marangoni flows. The resulting dynamics is studied by numerically integrating the incompressible Navier-Stokes equations coupled to reaction-diffusion-convection (RDC) equations for the three chemical species...
September 28, 2016: Journal of Chemical Physics
Hiroyuki Katsuki, Kenji Ohmori
We have experimentally performed the coherent control of delocalized ro-vibrational wave packets (RVWs) of solid para-hydrogen (p-H2) by the wave packet interferometry (WPI) combined with coherent anti-Stokes Raman scattering (CARS). RVWs of solid p-H2 are delocalized in the crystal, and the wave function with wave vector k ∼ 0 is selectively excited via the stimulated Raman process. We have excited the RVW twice by a pair of femtosecond laser pulses with delay controlled by a stabilized Michelson interferometer...
September 28, 2016: Journal of Chemical Physics
Mingge Deng, Zhen Li, Oleg Borodin, George Em Karniadakis
We develop a "charged" dissipative particle dynamics (cDPD) model for simulating mesoscopic electrokinetic phenomena governed by the stochastic Poisson-Nernst-Planck and the Navier-Stokes equations. Specifically, the transport equations of ionic species are incorporated into the DPD framework by introducing extra degrees of freedom and corresponding evolution equations associated with each DPD particle. Diffusion of ionic species driven by the ionic concentration gradient, electrostatic potential gradient, and thermal fluctuations is captured accurately via pairwise fluxes between DPD particles...
October 14, 2016: Journal of Chemical Physics
William E Perreault, Nandini Mukherjee, Richard N Zare
Stark induced adiabatic Raman passage (SARP) allows us to prepare an appreciable concentration of isolated molecules in a specific, high-lying vibrational level. The process has general applicability, and, as a demonstration, we transfer nearly 100 percent of the HD (v = 0, J = 0) in a supersonically expanded molecular beam of HD molecules to HD (v = 4, J = 0). This is achieved with a sequence of partially overlapping nanosecond pump (355 nm) and Stokes (680 nm) single-mode laser pulses of unequal intensities...
October 21, 2016: Journal of Chemical Physics
I Santamaría-Holek, A Pérez-Madrid
The distinction between the damping coefficient and the effective non-linear mobility of driven particles in active micro-rheology of supercooled liquids is explained in terms of individual and collective dynamics. The effective mobility arises as a collective effect which gives insight into the energy landscape of the system. On the other hand, the damping coefficient is a constant that modulates the effect of external forces over the thermal energy which particles have at their disposition to perform Brownian motion...
October 7, 2016: Journal of Chemical Physics
Matthew Wiens, Yi Shen, Xi Li, Mohammad Salem, Nick Smisdom, Wei Zhang, Alex Brown, Robert E Campbell
The tetrameric red fluorescent protein from Discosoma sp. coral (DsRed) has previously been engineered to produce dimeric and monomeric fluorescent variants with excitation and emission profiles that span the visible spectrum. The brightest of the effectively monomeric DsRed variants is tdTomato - a tandem fusion of a dimeric DsRed variant. Here we describe the engineering of brighter red (RRvT), green (GGvT), and green-red heterodimeric (GRvT), tdTomato variants. GRvT exhibits 99% intramolecular Förster resonance energy transfer (FRET) efficiency, resulting in long Stokes shift red fluorescence...
October 26, 2016: Chembiochem: a European Journal of Chemical Biology
Fisseha Bekele Legesse, Sandro Heuke, Kerstin Galler, Patrick Hoffmann, Michael Schmitt, Ute Neugebauer, Michael Bauer, Jürgen Popp
Standard techniques for examining the distribution of vitamin A in liver either require staining or lead to rapid photobleaching of the molecule. A potentially better alternative approach is to use coherent anti-Stokes Raman scattering (CARS) microscopy; a fast, label-free, non-disruptive imaging method that provides contrast based on molecular vibrations. This contribution evaluates the viability of CARS microscopy for imaging vitamin A within thick hepatic tissue under physiological conditions by tuning into its characteristic vibrational band in the fingerprint region...
October 26, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
J L Santiago, R Borge, F Martin, D de la Paz, A Martilli, J Lumbreras, B Sanchez
The distribution of pollutants is spatially heterogeneous within urban streets making difficult to build a realistic concentration map. In this paper, a methodology based on computational fluid dynamic modeling with Reynolds-averaged Navier-Stokes approach is used to compute maps of concentration for a period of several weeks. The methodology is evaluated by comparing simulation results against experimental data from two different campaigns where a large number of passive samplers deployed in an area with heavy vehicular traffic in Madrid (Spain)...
October 22, 2016: Science of the Total Environment
Kazuki Shigyou, Ken H Nagai, Tsutomu Hamada
In the past decades, nanoparticles and nanomaterials have been actively used for applications such as visualizing nano/submicron cell structure, killing cancer cells and drug delivery systems. It is important to understand the physicochemical mechanisms that govern the motion of nanoparticles on a plasma membrane surface. However, the motion of small particles of < 1000 nm on lipid membranes is poorly understood. In this study, we investigated the diffusion of particles with a diameter of 200~800nm on a lipid membrane using cell-sized liposomes...
October 25, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Nagamalai Vasimalai, Maria T Fernandez-Arguelles
Highly fluorescent gold nanodots have been synthesized through a novel rapid, facile and one-pot room temperature route using trithiocyanuric acid as mild reducing agent and surface ligand. The proposed synthesis overcomes limitations of other synthetic routes in terms of cost, time, complexity and environmental risks, and gives rise to highly fluorescent gold nanodots within 10 min at room temperature, with a maximum emission wavelength at 623 nm and a large Stokes shift (213 nm). Moreover, the synthesized gold nanodots showed a large emission QY (9...
November 25, 2016: Nanotechnology
Yutaka Maeda, Yuya Takehana, Jing-Shuang Dang, Mitsuaki Suzuki, Michio Yamada, Shigeru Nagase
Alkylated SWNTs were thermally treated to determine the influence of the substituents and the degree of functionalization on their thermal stability and photoluminescence (PL) properties. Alkylated SWNTs were prepared using sodium naphthalenide and alkyl bromide. The defunctionalization of alkylated SWNTs was monitored by absorption and Raman spectra. A selective recovery of the characteristic absorption and RBM peaks were observed during the thermal treatment, which indicates that the thermal stability of alkylated SWNTs decreased with an increase in SWNT diameter and with an increase in the degree of functionalization...
October 24, 2016: Chemistry: a European Journal
Jennifer C Reneker, Kyra Weems, Vincent Scaia
This study was aimed at determining the effect of an integrated group balance class for community-dwelling older adults within entry-level physical therapist coursework on student perceptions of geriatric physical therapy and geriatric physical therapy education. Twenty-nine Doctor of Physical Therapy (DPT) students, 21-33 years old, in their second year of coursework in 2012, participated in an integrated clinical experience with exposure to geriatric patients at an outpatient facility at the Louis Stokes Cleveland Department of Veterans Affairs Medical Center in Akron, Ohio, USA...
October 25, 2016: Journal of Educational Evaluation for Health Professions
Federica Lo Verso, José A Pomposo, Juan Colmenero, Angel J Moreno
By means of extensive simulations, we investigate concentrated solutions of globular single-chain nanoparticles (SCNPs), an emergent class of synthetic soft nano-objects. By increasing the concentration, the SCNPs show flattening, and even reentrant behaviour, in the density dependence of their structural and dynamic correlations, as well as a soft caging regime and weak dynamic heterogeneity. The latter is confirmed by validation of the Stokes-Einstein relation up to concentrations far beyond the overlap density...
October 24, 2016: Soft Matter
J K Lee, G M Moraru, J V Stokes, R W Wills, E Mitchell, E Unz, B Moore-Henderson, A B Harper, A S Varela-Stokes
Amblyomma maculatum Koch (Acari: Ixodidae), the primary vector for Rickettsia parkeri, may also be infected with a rickettsia of unknown pathogenicity, "Candidatus Rickettsia andeanae." Infection rates with these rickettsiae vary geographically, and coinfected ticks have been reported. In this study, infection rates of R. parkeri and "Ca R. andeanae" were evaluated, and rickettsial DNA levels quantified, in 335 questing adult A. maculatum collected in 2013 (n = 95), 2014 (n = 139), and 2015 (n = 101) from Oktibbeha County, MS...
October 22, 2016: Journal of Medical Entomology
Tim Stokes, Elizabeth J Shaw, Janette Camosso-Stefinovic, Mari Imamura, Lovney Kanguru, Julia Hussein
BACKGROUND: Maternal mortality remains a major international health problem in low- and middle-income countries (LMIC), and most could have been prevented by quality improvement interventions already demonstrated to be effective, such as clinical guideline implementation strategies. The aim of this systematic review was to synthesise qualitative evidence on guideline implementation strategies to improve obstetric care practice in LMIC in order to identify barriers and enablers to their successful implementation...
October 22, 2016: Implementation Science: IS
Per Martin Arvidsson, Johannes Töger, Marcus Carlsson, Katarina Steding-Ehrenborg, Gianni Pedrizzetti, Einar Heiberg, Hakan Arheden
Intracardiac blood flow is driven by hemodynamic forces that are exchanged between the blood and myocardium. Previous studies have been limited to 2D measurements or investigated only LV forces. Right ventricular forces and their mechanistic contribution to asymmetric redirection of flow in the RV have not been measured. We therefore aimed to quantify three-dimensional hemodynamic forces in both ventricles in a cohort of healthy subjects, using magnetic resonance imaging 4D flow measurements. 25 controls,14 elite endurance athletes, and two patients with left ventricular dyssynchrony were included...
October 21, 2016: American Journal of Physiology. Heart and Circulatory Physiology
Nizal Sarrafzadegan, Mojgan Gharipour, Masoumeh Sadeghi, Pouya Nezafati, Mohammad Talaie, Shahram Oveisgharan, Fatemeh Nouri, Alireza Khosravi
BACKGROUND: Metabolic syndrome (MetS) is recently proposed as a predictor for the occurrence of vascular defects causing ischemic stroke. However, details on the association of MetS with stroke are scare in our region. The present study aimed to assess the predictive value of MetS and its components for stoke among the Iranian population. METHODS: A longitudinal population-based study was conducted on adults aged 35 years or older who were living in 3 districts in central part of Iran and followed for 10 years...
October 18, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Yuhong Liu, Linlin Zhao, Jin Zhang, Jinzha Zhang, Wenbo Zhao, Chun Mao
The work investigates a new fluorescence resonance energy transfer (FRET) system using NaEuF4 nanoparticles (NPs) and Au@Ag2S NPs as the energy donor-acceptor pair for the first time. The NaEuF4/Au@Ag2S NPs-based FRET DNA sensor was constructed with NaEuF4 NPs as the fluorescence (FL) donor and Au@Ag2S core-shell NPs as FL acceptor. In order to find the matching energy acceptor, the amount of AgNO3 and Na2S were controlled in the synthesis process to overlap the absorption spectrum of energy acceptor with the emission spectrum of energy donors...
December 1, 2016: Talanta
Daniel Jaeger, Christian Pilger, Henning Hachmeister, Elina Oberländer, Robin Wördenweber, Julian Wichmann, Jan H Mussgnug, Thomas Huser, Olaf Kruse
Oleaginous photosynthetic microalgae hold great promise as non-food feedstocks for the sustainable production of bio-commodities. The algal lipid quality can be analysed by Raman micro-spectroscopy, and the lipid content can be imaged in vivo in a label-free and non-destructive manner by coherent anti-Stokes Raman scattering (CARS) microscopy. In this study, both techniques were applied to the oleaginous microalga Monoraphidium neglectum, a biotechnologically promising microalga resistant to commonly applied lipid staining techniques...
October 21, 2016: Scientific Reports
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