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Cross frequency coupling

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https://www.readbyqxmd.com/read/28713841/design-and-implementation-of-an-optimal-laser-pulse-front-tilting-scheme-for-ultrafast-electron-diffraction-in-reflection-geometry-with-high-temporal-resolution
#1
Francesco Pennacchio, Giovanni M Vanacore, Giulia F Mancini, Malte Oppermann, Rajeswari Jayaraman, Pietro Musumeci, Peter Baum, Fabrizio Carbone
Ultrafast electron diffraction is a powerful technique to investigate out-of-equilibrium atomic dynamics in solids with high temporal resolution. When diffraction is performed in reflection geometry, the main limitation is the mismatch in group velocity between the overlapping pump light and the electron probe pulses, which affects the overall temporal resolution of the experiment. A solution already available in the literature involved pulse front tilt of the pump beam at the sample, providing a sub-picosecond time resolution...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28713250/impaired-in-vivo-gamma-oscillations-in-the-medial-entorhinal-cortex-of-knock-in-alzheimer-model
#2
Tomoaki Nakazono, Travis N Lam, Ayushi Y Patel, Masashi Kitazawa, Takashi Saito, Takaomi C Saido, Kei M Igarashi
The entorhinal cortex (EC) has bidirectional connections with the hippocampus and plays a critical role in memory formation and retrieval. EC is one of the most vulnerable regions in the brain in early stages of Alzheimer's disease (AD), a neurodegenerative disease with progressive memory impairments. Accumulating evidence from healthy behaving animals indicates gamma oscillations (30-100 Hz) as critical for mediating interactions in the circuit between EC and hippocampus. However, it is still unclear whether gamma oscillations have causal relationship with memory impairment in AD...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28696761/parametric-oscillation-frequency-mixing-and-injection-locking-of-strongly-coupled-nanomechanical-resonator-modes
#3
Maximilian J Seitner, Mehdi Abdi, Alessandro Ridolfo, Michael J Hartmann, Eva M Weig
We study locking phenomena of two strongly coupled, high quality factor nanomechanical resonator modes to a common parametric drive at a single drive frequency in different parametric driving regimes. By controlled dielectric gradient forces we tune the resonance frequencies of the flexural in-plane and out-of-plane oscillation of the high stress silicon nitride string through their mutual avoided crossing. For the case of the strong common parametric drive signal-idler generation via nondegenerate parametric two-mode oscillation is observed...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28670431/evaluation-on-hope-and-psychological-symptoms-in-infertile-couples-undergoing-assisted-reproduction-treatment
#4
Reza Omani Samani, Samira Vesali, Behnaz Navid, Bahareh Vakiliniya, Maryam Mohammadi
BACKGROUND: This study evaluated hope, depression, anxiety, and stress among three groups of infertile couples. MATERIALS AND METHODS: This cross-sectional study consisted of three groups of infertile couples-candidates for oocyte donation (n=60), embryo donation (n=60), and normal infertile (n=60). Participants included couples seen at Royan Institute, Tehran, Iran between 2013-2014 who were at least 18 years of age and could read and write in Persian. Participants provided demographic and general characteristics and completed the Persian version of the Adult Trait Hope Scale (hope, agency and pathway) and Depression, Anxiety, and Stress Scale (DASS)...
July 2017: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/28668059/planarizing-cytosine-the-s1-state-structure-vibrations-and-nonradiative-dynamics-of-jet-cooled-5-6-trimethylenecytosine
#5
Maria A Trachsel, Simon Lobsiger, Tobias Schär, Lluís Blancafort, Samuel Leutwyler
We measure the S0 → S1 spectrum and time-resolved S1 state nonradiative dynamics of the "clamped" cytosine derivative 5,6-trimethylenecytosine (TMCyt) in a supersonic jet, using two-color resonant two-photon ionization (R2PI), UV/UV holeburning, and ns time-resolved pump/delayed ionization. The experiments are complemented with spin-component scaled second-order approximate coupled cluster (SCS-CC2), time-dependent density functional theory, and multi-state second-order perturbation-theory (MS-CASPT2) ab initio calculations...
June 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28668050/ionization-of-pyridine-interplay-of-orbital-relaxation-and-electron-correlation
#6
A B Trofimov, D M P Holland, I Powis, R C Menzies, A W Potts, L Karlsson, E V Gromov, I L Badsyuk, J Schirmer
The valence shell ionization spectrum of pyridine was studied using the third-order algebraic-diagrammatic construction approximation scheme for the one-particle Green's function and the outer-valence Green's function method. The results were used to interpret angle resolved photoelectron spectra recorded with synchrotron radiation in the photon energy range of 17-120 eV. The lowest four states of the pyridine radical cation, namely, (2)A2(1a2(-1)), (2)A1(7a1(-1)), (2)B1(2b1(-1)), and (2)B2(5b2(-1)), were studied in detail using various high-level electronic structure calculation methods...
June 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28663726/neural-cross-frequency-coupling-functions
#7
Tomislav Stankovski, Valentina Ticcinelli, Peter V E McClintock, Aneta Stefanovska
Although neural interactions are usually characterized only by their coupling strength and directionality, there is often a need to go beyond this by establishing the functional mechanisms of the interaction. We introduce the use of dynamical Bayesian inference for estimation of the coupling functions of neural oscillations in the presence of noise. By grouping the partial functional contributions, the coupling is decomposed into its functional components and its most important characteristics-strength and form-are quantified...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28662486/sensitivity-enhancement-by-multiple-contact-cross-polarization-under-magic-angle-spinning
#8
J Raya, J Hirschinger
Multiple-contact cross-polarization (MC-CP) is applied to powder samples of ferrocene and l-alanine under magic-angle spinning (MAS) conditions. The method is described analytically through the density matrix formalism. The combination of a two-step memory function approach and the Anderson-Weiss approximation is found to be particularly useful to derive approximate analytical solutions for single-contact Hartmann-Hahn CP (HHCP) and MC-CP dynamics under MAS. We show that the MC-CP sequence requiring no pulse-shape optimization yields higher polarizations at short contact times than optimized adiabatic passage through the HH condition CP (APHH-CP) when the MAS frequency is comparable to the heteronuclear dipolar coupling, i...
June 16, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28659769/propofol-sevoflurane-and-ketamine-induce-a-reversible-increase-in-delta-gamma-and-theta-gamma-phase-amplitude-coupling-in-frontal-cortex-of-rat
#9
Dinesh Pal, Brian H Silverstein, Lana Sharba, Duan Li, Viviane S Hambrecht-Wiedbusch, Anthony G Hudetz, George A Mashour
Studies from human and non-human species have demonstrated a breakdown of functional corticocortical connectivity during general anesthesia induced by anesthetics with diverse molecular, neurophysiological, and pharmacological profiles. Recent studies have demonstrated that changes in long-range neural communication, and by corollary, functional connectivity, might be influenced by cross-frequency coupling (CFC) between the phase of slow oscillations and the amplitude of local fast oscillations. Phase-amplitude coupling (PAC) between slow oscillations and alpha rhythm during general anesthesia reveal distinct patterns depending on the anesthetic...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28656925/family-planning-practices-of-rural-community-dwellers-in-cross-river-state-nigeria
#10
A J Etokidem, W Ndifon, J Etowa, E F Asuquo
BACKGROUND: Nigeria is the most populous nation in Africa and the seventh most populous in the world. Despite a high fertility rate of 5.5 per woman and a high population growth rate of 3.2%, Nigeria's contraceptive prevalence is 15%, which is one of the lowest in the world. The objective of this study was to determine the knowledge of family planning and family planning preferences and practices of rural community women in Cross River State of Nigeria. MATERIALS AND METHODS: This was a cross-sectional study involving 291 rural women...
June 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28647431/temporal-segmentation-for-laryngeal-high-speed-videoendoscopy-in-connected-speech
#11
Maryam Naghibolhosseini, Dimitar D Deliyski, Stephanie R C Zacharias, Alessandro de Alarcon, Robert F Orlikoff
OBJECTIVE: This study proposes a gradient-based method for temporal segmentation of laryngeal high-speed videoendoscopy (HSV) data obtained during connected speech. METHODS: A custom-developed HSV system coupled with a flexible fiberoptic nasolaryngoscope was used to record one vocally normal female participant during reading of the "Rainbow Passage." A gradient-based algorithm was developed to generate a motion window. When applied to the HSV data, the motion window acted as a filter tracking the location of the vibrating vocal folds...
June 21, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28637840/promoting-sleep-oscillations-and-their-functional-coupling-by-transcranial-stimulation-enhances-memory-consolidation-in-mild-cognitive-impairment
#12
Julia Ladenbauer, Josef Ladenbauer, Nadine Külzow, Rebecca de Boor, Elena Avramova, Ulrike Grittner, Agnes Flöel
Alzheimer's disease (AD) not only involves loss of memory functions but also prominent deterioration of sleep physiology, already evident in the stage of mild cognitive impairment (MCI). Cortical slow oscillations (SO, 0.5-1 Hz) and thalamo-cortical spindle activity (12-15 Hz) during sleep, and their temporal coordination, are considered critical for memory formation. We investigated the potential of slow oscillatory transcranial direct current stimulation (so-tDCS), applied during a daytime nap in a sleep state-dependent manner, to modulate these activity patterns and sleep-related memory consolidation in 9 male and 7 female human patients with MCI...
June 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28621583/effect-of-a-publicly-accessible-disclosure-system-on-food-safety-inspection-scores-in-retail-and-food-service-establishments
#13
Jihee Choi, Robert L Scharff
The increased frequency with which people are dining out coupled with an increase in the publicity of foodborne disease outbreaks has led the public to an increased awareness of food safety issues associated with food service establishments. To accommodate consumer needs, local health departments have increasingly publicized food establishments' health inspection scores. The objective of this study was to estimate the effect of the color-coded inspection score disclosure system in place since 2006 in Columbus, OH, by controlling for several confounding factors...
June 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28618492/spontaneous-exchange-of-leader-laggard-relationship-in-mutually-coupled-synchronized-semiconductor-lasers
#14
Kazutaka Kanno, Takuya Hida, Atsushi Uchida, Masatoshi Bunsen
We investigate the instantaneous behavior of synchronized temporal wave forms in two mutually coupled semiconductor lasers numerically and experimentally. The temporal wave forms of two lasers are synchronized with a propagation delay time, with one laser oscillating in advance of the other, known as the leader-laggard relationship. The leader-laggard relationship can be determined by measuring the cross-correlation between the two temporal wave forms with the propagation delay time. The leader can be identified when the optical carrier frequency of the leader laser is higher than that of the other laser...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28596934/gel-performance-in-rheology-and-profile-control-under-low-frequency-vibration-coupling-application-of-physical-and-chemical-eor-techniques
#15
Li Ming Zheng, Chun Sheng Pu, Jing Liu, Bo Ma, Nasir Khan
Flowing gel plugging and low-frequency vibration oil extraction technology have been widely applied in low-permeability formation. High probability of overlapping in action spheres of two technologies might lead to poor operating efficiency during gel injection. Study on flowing gel rheological properties under low-frequency vibration was essential, which was carried out indoor with viscosity measurement. Potential dynamic mechanisms were analyzed for the rheological variation. Under low-frequency vibration, gel rheological properties were found to be obviously influenced, with vibration delaying gel cross-linking in induction period, causing a two-stage gel viscosity change in acceleration period, and decreasing gel strength in stable period...
2017: Journal of Petroleum Exploration and Production Technology
https://www.readbyqxmd.com/read/28592697/top-down-beta-enhances-bottom-up-gamma
#16
Craig G Richter, William H Thompson, Conrado A Bosman, Pascal Fries
Several recent studies have demonstrated that the bottom-up signaling of a visual stimulus is subserved by interareal gamma-band synchronization, whereas top-down influences are mediated by alpha-beta band synchronization. These processes may implement top-down control of stimulus processing if top-down and bottom-up mediating rhythms are coupled via cross-frequency interaction. To test this possibility, we investigated Granger-causal influences among awake male macaque primary visual area V1, higher visual area V4 and parietal control area 7a during attentional task performance...
June 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28583343/relational-intimacy-mediates-sexual-outcomes-associated-with-impaired-sexual-function-examination-in-a-clinical-sample
#17
Marta Parkanyi Witherow, Shambhavi Chandraiah, Samantha R Seals, Dustin E Sarver, Kathryn E Parisi, Antal Bugan
BACKGROUND: Relational intimacy is hypothesized to underlie the association between female sexual functioning and various sexual outcomes, and married women and women with sexual dysfunction have been generally absent from prior studies investigating these associations, thus restricting generalizability. AIM: To investigate whether relational intimacy mediates sexual outcomes (sexual satisfaction, coital frequency, and sexual distress) in a sample of married women with and without impaired sexual functioning presenting in clinical settings...
June 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28576950/retrospective-case-reports-of-two-central-north-carolina-residents-frequency-of-tick-bites-and-associated-illnesses-2001-2014
#18
Marcia E Herman-Giddens, D Marcus Herman-Giddens
BACKGROUND Tick bites are a source of illness and disease agents that may lead to morbidity and occasional fatalities in North Carolina. Public health interest in tick-borne illness and disease has increased due to continuing discoveries of tick-borne diseases and their increasing geographic spread and disease incidence. There are no data published on lay individuals with cumulative tick bites and associated illnesses over a period of years.METHODS We learned of a married couple living on a central North Carolina property who had used reasonable bite prevention methods, kept attached ticks after removal, and recorded dates and related illness records from 2001-2014...
May 2017: North Carolina Medical Journal
https://www.readbyqxmd.com/read/28574461/innovative-high-throughput-saxs-methodologies-based-on-photonic-lab-on-a-chip-sensors-application-to-macromolecular-studies
#19
Isaac Rodríguez-Ruiz, Dimitri Radajewski, Sophie Charton, Nhat Phamvan, Martha Brennich, Petra Pernot, Françoise Bonneté, Sébastien Teychené
The relevance of coupling droplet-based Photonic Lab-on-a-Chip (PhLoC) platforms and Small-Angle X-Ray Scattering (SAXS) technique is here highlighted for the performance of high throughput investigations, related to the study of protein macromolecular interactions. With this configuration, minute amounts of sample are required to obtain reliable statistical data. The PhLoC platforms presented in this work are designed to allow and control an effective mixing of precise amounts of proteins, crystallization reagents and buffer in nanoliter volumes, and the subsequent generation of nanodroplets by means of a two-phase flow...
June 2, 2017: Sensors
https://www.readbyqxmd.com/read/28574350/characterization-of-kerfless-linear-arrays-based-on-pzt-thick-film
#20
Tomasz Zawada, Louise Bierregaard, Erling Ringgaard, Ruichao Xu, Michele Guizzetti, Franck Levassort, Dominique Certon
Multi-element transducers enabling novel cost-effective fabrication of imaging arrays for medical applications have been presented earlier. Due to the favorable low lateral coupling of the screen-printed PZT, the elements can be defined by the top electrode pattern only, leading to a kerfless design with low cross-talk between the elements. The thick-film based linear arrays have proved to be compatible with a commercial ultrasonic scanner and to support linear array beamforming as well as phased array beamforming...
May 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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