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https://www.readbyqxmd.com/read/29353282/differential-changes-in-myocardial-performance-index-and-its-time-intervals-in-donors-and-recipients-of-twin-to-twin-transfusion-syndrome-before-and-after-laser-therapy
#1
Javier U Ortiz, Ximena Torres, Elisenda Eixarch, Mar Bennasar, Monica Cruz-Lemini, Olga Gómez, Silvia M Lobmaier, Josep M Martínez, Eduard Gratacós, Fatima Crispi
OBJECTIVE: To evaluate left myocardial performance index (MPI) and time intervals in fetuses with twin-to-twin transfusion syndrome (TTTS) before and after laser surgery. METHODS: Fifty-one fetal pairs with TTTS and 47 uncomplicated monochorionic twin pairs were included. Left ventricular isovolumetric contraction time (ICT), ejection time (ET), and isovolumetric relaxation time (IRT) were measured using conventional Doppler. RESULTS: Recipients showed prolonged ICT (46 ± 12 vs...
January 19, 2018: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/29353129/keeping-it-together-and-falling-apart-women-s-dynamic-experience-of-birth
#2
Priscilla J Hall, Jennifer Whitman Foster, Kathryn M Yount, Bonnie Mowinski Jennings
OBJECTIVE: To explore the complexity of women's birth experiences in the context in which they occur and to describe how these influence women's well-being in labor. DESIGN: Qualitative method with a phenomenological approach, following the analysis principles of van Manen. PARTICIPANTS AND SETTING: Eight women from different ethnic and socioeconomic backgrounds in Atlanta, Georgia, United States with a recent, healthy birth were interviewed twice about their experience of the labor journey...
December 14, 2017: Midwifery
https://www.readbyqxmd.com/read/29352927/self-assembly-and-rheological-behaviors-of-intermacromolecular-complexes-consisting-of-oppositely-charged-fluorinated-guar-gums
#3
Chen Wang, Liewei Qiu, Tao Wang
We synthesized fluorinated cationic/anionic guar gums (FCGG and FAGG) and characterized these species using Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy. The degree of fluorine substitution of FCGG (0.26%) and FAGG (0.21%) was calculated by elemental analysis. In addition, we explored the self-assembly and rheological behaviors of FCGG-FAGG complexes by viscometry, scanning electron microscopy, light scattering, fluorescence spectroscopy, and rheometry. The maximum viscosity and molecular weights were observed with a FAGG:FCGG mass ratio of 7...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352792/relationship-between-global-and-segmental-dynamics-of-poly-butylene-oxide-studied-by-broadband-dielectric-spectroscopy
#4
Osamu Urakawa, Minoru Yamane, Shota Tomie, Tadashi Inoue, Toshiyuki Shikata, Keiichiro Adachi
Relationship between segmental relaxation and normal-mode relaxation has been studied for molten poly(butylene oxide)s having various molecular weights by broadband dielectric spectroscopy over a wide temperature (T) range. We found that T dependence of the segmental relaxation time, τs, was weaker than the normal mode time, τn, at high T(>250 K ∼ Tg + 50 K), and the τn/τs ratio systematically decreased with increasing temperature. This high temperature complexity, whose mechanism has not been discussed in detail so far, was quantitatively explained by assuming the two step processes: local conformation change of polymers (elementary process) occurs first, and then the motion of a segment unit (second process) occurs...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352789/hydrodynamic-relaxations-in-dissipative-particle-dynamics
#5
J S Hansen, Michael L Greenfield, Jeppe C Dyre
This paper studies the dynamics of relaxation phenomena in the standard dissipative particle dynamics (DPD) model [R. D. Groot and P. B. Warren, J. Chem. Phys. 107, 4423 (1997)]. Using fluctuating hydrodynamics as the framework of the investigation, we focus on the collective transverse and longitudinal dynamics. It is shown that classical hydrodynamic theory predicts the transverse dynamics at relatively low temperatures very well when compared to simulation data; however, the theory predictions are, on the same length scale, less accurate for higher temperatures...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352787/communication-exact-analytical-derivatives-for-the-domain-based-local-pair-natural-orbital-mp2-method-dlpno-mp2
#6
Peter Pinski, Frank Neese
Electron correlation methods based on pair natural orbitals (PNOs) have gained an increasing degree of interest in recent years, as they permit energy calculations to be performed on systems containing up to many hundred atoms, while maintaining chemical accuracy for reaction energies. We present an approach for taking exact analytical first derivatives of the energy contributions in the simplest method of the family of Domain-based Local Pair Natural Orbital (DLPNO) methods, closed-shell DLPNO-MP2. The Lagrangian function contains constraints to account for the relaxation of PNOs...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352786/from-elemental-tellurium-to-ge2sb2te5-melts-high-temperature-dynamic-and-relaxation-properties-in-relationship-with-the-possible-fragile-to-strong-transition
#7
H Flores-Ruiz, M Micoulaut
We investigate the dynamic properties of Ge-Sb-Te phase change melts using first principles molecular dynamics with a special emphasis on the effect of tellurium composition on melt dynamics. From structural models and trajectories established previously [H. Flores-Ruiz et al., Phys. Rev. B 92, 134205 (2015)], we calculate the diffusion coefficients for the different species, the activation energies for diffusion, the Van Hove correlation, and the intermediate scattering functions able to substantiate the dynamics and relaxation behavior of the liquids as a function of temperature and composition that is also compared to experiment whenever possible...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352774/the-bloch-equation-with-terms-induced-by-an-electric-field
#8
Piotr Garbacz
The Bloch equation of the nuclear magnetization of spin-1/2 nuclei in molecules, which have permanent electric dipole moments μe that are placed simultaneously in a magnetic field B and an electric field E, is derived. It is shown that if the principal components of the nuclear magnetic shielding tensor σ and the dipole moment μe are known, then the measurement of the transverse component to the magnetic field B of the nuclear magnetization, which is induced by the application of the electric field oscillating at the half of the spin precession frequency, allows determining the orientation of the dipole moment μe with respect to the principal axis system of the symmetric part of the tensor σ...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352773/ultra-fast-relaxation-decoherence-and-localization-of-photoexcited-states-in-%C3%AF-conjugated-polymers
#9
Jonathan R Mannouch, William Barford, Sarah Al-Assam
The exciton relaxation dynamics of photoexcited electronic states in poly(p-phenylenevinylene) are theoretically investigated within a coarse-grained model, in which both the exciton and nuclear degrees of freedom are treated quantum mechanically. The Frenkel-Holstein Hamiltonian is used to describe the strong exciton-phonon coupling present in the system, while external damping of the internal nuclear degrees of freedom is accounted for by a Lindblad master equation. Numerically, the dynamics are computed using the time evolving block decimation and quantum jump trajectory techniques...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352745/negative-supercoiling-of-dna-by-gyrase-is-inhibited-in-salmonella-enterica-serovar-typhimurium-during-adaptation-to-acid-stress
#10
Aoife M Colgan, Heather J Quinn, Stefani C Kary, Lesley A Mitchenall, Anthony Maxwell, Andrew Ds Cameron, Charles J Dorman
DNA in intracellular Salmonella enterica serovar Typhimurium relaxes during growth in the acidified (pH 4 to 5) macrophage vacuole and DNA relaxation correlates with upregulation of Salmonella genes involved in adaptation to the macrophage environment. Bacterial ATP levels did not increase during adaptation to acid pH unless the bacterium was deficient in MgtC, a cytoplasmic-membrane-located inhibitor of proton-driven F1 F0 ATP synthase activity. Inhibiting ATP binding by DNA gyrase and topo IV with novobiocin enhanced the effect of low pH on DNA relaxation...
January 20, 2018: Molecular Microbiology
https://www.readbyqxmd.com/read/29352638/the-evaluation-of-the-hydrophilic-hydrophobic-interactions-and-their-effect-in-water-methanol-solutions-a-study-in-terms-of-the-thermodynamic-state-functions-in-the-frame-of-the-transition-state-theory
#11
Francesco Mallamace, Carmelo Corsaro, Sveva Longo, Sow-Hsin Chen, Domenico Mallamace
Aqueous solutions of amphiphilic molecules are characterized by the competition between hydrophilic and hydrophobic interactions. These interactions have a different energetic dependence with the temperature. Whereas hydrophilic interactions have been well characterized, a complete theory for the hydrophobic ones is still lacking as well as the comprehension of the effect that the solvent exerts on the solute and vice versa. In this paper from the measured relaxation time, we evaluated the thermodynamic state functions of water-methanol solutions in the frame of the transition state theory...
January 11, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29352578/a-physiotherapist-led-exercise-and-education-program-for-preventing-recurrence-of-low-back-pain-a-randomised-controlled-pilot-trial
#12
Matthew L Stevens, Chung-Wei C Lin, Mark J Hancock, Trish Wisby-Roth, Jane Latimer, Chris G Maher
BACKGROUND: Before beginning a large and complex trial it is considered good practice to run a pilot study to assess the feasibility and acceptability so that quality is maintained and resources are not wasted. OBJECTIVE: To assesses the feasibility and acceptability of procedures for TOPS: Trial Of Prevention Strategies for low back pain. DESIGN: Randomised controlled pilot trial. METHODS: This is a trial of an 8 week, physiotherapist-led group exercise and education program for preventing recurrence of low back pain (LBP) in those recently recovered from LBP...
September 1, 2017: Physiotherapy
https://www.readbyqxmd.com/read/29352366/a-new-class-of-cest-experiment-based-on-selecting-different-magnetization-components-at-the-start-and-end-of-the-cest-relaxation-element-an-application-to-1h-cest
#13
Tairan Yuwen, Lewis E Kay
Chemical exchange saturation transfer (CEST) experiments are becoming increasingly popular for investigating biomolecular exchange dynamics with rates on the order of approximately 50-500 s-1 and a rich toolkit of different methods has emerged over the past few years. Typically, experiments are based on the evolution of longitudinal magnetization, or in some cases two-spin order, during a fixed CEST relaxation delay, with the same class of magnetization prepared at the start and selected at end of the CEST period...
January 19, 2018: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/29352234/bi-exponential-3d-t1%C3%AF-mapping-of-whole-brain-at-3%C3%A2-t
#14
Rajiv G Menon, Azadeh Sharafi, Johannes Windschuh, Ravinder R Regatte
Detection of multiple relaxation pools using MRI is useful in a number of neuro-pathologies including multiple sclerosis (MS), Alzheimer's, and stroke. In this study we evaluate the feasibility of using T1ρ imaging for the detection of bi-exponential decays in the human brain. A prospective T1ρ imaging study was performed on model relaxation phantoms (eggs) and 7 healthy volunteers. The data was fitted using a single pool and a 2-pool model to estimate mono- and bi-exponential T1ρ maps, respectively. Bi-exponential decays were identified in the gray matter (GM) and white matter (WM) of the brain with 40...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352146/effects-of-renal-denervation-on-cardiac-structural-and-functional-abnormalities-in-patients-with-resistant-hypertension-or-diastolic-dysfunction
#15
Shiying Wang, Suxia Yang, Xinxin Zhao, Jun Shi
The aim of the present study is to systematically evaluate the impact of RDN on cardiac structure and function in patients with resistant hypertension (RH) or diastolic dysfunction. We retrieved Pubmed, Embase and Cocharane Library databases, from inception to April 1st, 2016. Studies reporting left ventricular mass (LVMI) or left ventricular (LV) diastolic function (reflected by the ratio of mitral inflow velocity to annular relaxation velocity [E/e']) responses to RDN were included. Two randomized controlled trials (RCTs), 3 controlled studies and 11 uncontrolled studies were finally identified...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351853/cardiac-biomarkers-as-sensitive-tools-to-evaluate-the-impact-of-xenobiotics-on-amphibians-the-effects-of-anionic-surfactant-linear-alkylbenzene-sulfonate-las
#16
Monica Jones-Costa, Lilian Franco-Belussi, Felipe Augusto Pinto Vidal, Nathália Penteado Gongora, Luciano Mendes Castanho, Cleoni Dos Santos Carvalho, Elaine Cristina Mathias Silva-Zacarin, Fabio Camargo Abdalla, Iolanda Cristina Silveira Duarte, Classius De Oliveira, Cristiane Ronchi de Oliveira, Raquel Fernanda Salla
Amphibian populations have been experiencing a drastic decline worldwide. Aquatic contaminants are among the main factors responsible for this decline, especially in the aquatic environment. The linear alkylbenzene sulfonate (LAS) is of particular concern, since it represents 84% of the anionic surfactants' trade. In Brazil, the maximal LAS concentration allowed in fresh waters is 0.5mgL-1, but its potential harmful effects in amphibians remain unknown. Therefore, this study aimed to analyze the effects of a sublethal concentration of LAS (0...
January 16, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29351461/exercise-training-induces-enos-coupling-and-restores-relaxation-in-coronary-arteries-of-heart-failure-rats
#17
Gisele Kruger Couto, Suliana Mesquita Paula, Igor L Gomes-Santos, Carlos Eduardo Negrão, Luciana Venturini Rossoni
Exercise training (ET) has emerged as a non-pharmacological therapy for cardiovascular diseases because of its helpful milieu for improving vascular function. The aim of the present study was to assess whether ET reverses the alterations in vascular reactivity observed in heart failure (HF)-related coronary arteries and to elucidate the molecular mechanisms involved in these adjustments. Male Wistar rats were subjected to either coronary artery ligation or sham operation (SO). Four weeks after the surgery, the rats were divided into two groups: untrained HF (UHF) and exercise-trained HF (THF)...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351457/important-role-of-endothelium-dependent-hyperpolarization-in-pulmonary-microcirculation-in-male-mice-implications-for-hypoxia-induced-pulmonary-hypertension
#18
Shuhei Tanaka, Takashi Shiroto, Shigeo Godo, Hiroki Saito, Yosuke Ikumi, Akiyo Ito, Shoko Kajitani, Saori Sato, Hiroaki Shimokawa
Endothelium-dependent hyperpolarization (EDH) plays important roles in systemic circulation, whereas its role in pulmonary circulation remains largely unknown. Furthermore, the underlying mechanisms of pulmonary hypertension (PH) also remain to be elucidated. We thus aimed to elucidate the role of EDH in pulmonary circulation in general and in PH in particular. In isolated perfused lung using male wild-type mice, endothelium-dependent relaxations to bradykinin (BK) were significantly reduced in the presence of Nω-nitro-L-arginine (L-NNA) by ~50% as compared with those in the presence of indomethacin, and the combination of apamin plus charybdotoxin abolished the residual relaxations, showing the comparable contributions of nitric oxide (NO) and EDH in pulmonary microcirculation under physiological conditions...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351439/role-of-reactive-oxygen-species-and-sulfide-quinone-oxoreductase-in-hydrogen-sulfide-induced-contraction-of-rat-pulmonary-arteries
#19
Jesus Prieto-Lloret, Vladimir A Snetkov, Yasin Shaifta, Inmaculada Docio, Michelle J Connolly, Charles E Mackay, Greg A Knock, Jeremy Pt Ward, Philip I Aaronson
Application of H2S ('sulfide') elicits a complex contraction in rat pulmonary arteries (PA) comprising a small transient contraction (phase 1; Ph1) followed by relaxation and then a second, larger, and more sustained contraction (phase 2; Ph2). We investigated the mechanisms causing this response using isometric myography in rat second order PA, with Na2S as a sulfide donor. Both phases of contraction to 1000μM Na2S were attenuated by the pan-PKC inhibitor Gö6983 (3μM) and by 50μM ryanodine; the Ca2+ channel blocker nifedipine (1μM) was without effect...
December 28, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29350957/relativistic-fluid-dynamics-far-from-local-equilibrium
#20
Paul Romatschke
Fluid dynamics is traditionally thought to apply only to systems near local equilibrium. In this case, the effective theory of fluid dynamics can be constructed as a gradient series. Recent applications of resurgence suggest that this gradient series diverges, but can be Borel resummed, giving rise to a hydrodynamic attractor solution which is well defined even for large gradients. Arbitrary initial data quickly approaches this attractor via nonhydrodynamic mode decay. This suggests the existence of a new theory of far-from-equilibrium fluid dynamics...
January 5, 2018: Physical Review Letters
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