keyword
MENU ▼
Read by QxMD icon Read
search

Pulse

keyword
https://www.readbyqxmd.com/read/28527130/pulse-generation-in-the-quorum-machinery-of-pseudomonas-aeruginosa
#1
Cicik Alfiniyah, Martin A Bees, A Jamie Wood
Pseudomonas aeruginosa is a Gram-negative bacterium that is responsible for a wide range of infections in humans. Colonies employ quorum sensing (QS) to coordinate gene expression, including for virulence factors, swarming motility and complex social traits. The QS signalling system of P. aeruginosa is known to involve multiple control components, notably the las, rhl and pqs systems. In this paper, we examine the las system and, in particular, the repressive interaction of rsaL, an embedded small regulative protein, employing recent biochemical information to aid model construction...
May 19, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28526914/finite-element-method-simulating-temperature-distribution-in-skin-induced-by-980-nm-pulsed-laser-based-on-pain-stimulation
#2
Han Wang, Xiao-Xi Dong, Ji-Chun Yang, He Huang, Ying-Xin Li, Hai-Xia Zhang
For predicting the temperature distribution within skin tissue in 980-nm laser-evoked potentials (LEPs) experiments, a five-layer finite element model (FEM-5) was constructed based on Pennes bio-heat conduction equation and the Lambert-Beer law. The prediction results of the FEM-5 model were verified by ex vivo pig skin and in vivo rat experiments. Thirty ex vivo pig skin samples were used to verify the temperature distribution predicted by the model. The output energy of the laser was 1.8, 3, and 4.4 J. The laser spot radius was 1 mm...
May 19, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28526782/acute-impact-of-drinking-coffee-on-the-cerebral-and-systemic-vasculature
#3
Takuro Washio, Hiroyuki Sasaki, Shigehiko Ogoh
Previous studies have suggested that the risk of ischemic stroke increases immediately after drinking coffee. Indeed, drinking coffee, that is, caffeine, acutely increases arterial stiffness as well as blood pressure and peripheral vascular resistance. On the other hand, it has been reported that arterial stiffening is associated with elevation in the pulsatility index (PI) of cerebral blood flow (CBF), which increases the risk of brain disease. However, the effect of drinking coffee on the PI of the CBF and its interaction with arterial stiffness remain unknown...
May 2017: Physiological Reports
https://www.readbyqxmd.com/read/28526480/human-seasonal-and-circadian-studies-in-antarctica-halley-75-0-s
#4
Josephine Arendt, Benita Middleton
Living for extended periods in Antarctica exposes base personnel to extremes of daylength (photoperiod) and temperature. At the British Antarctic Survey base of Halley, 75(0)S, the sun does not rise for 110 d in the winter and does not set for 100 d in summer. Photoperiod is the major time cue governing the timing of seasonal events such as reproduction in many species. The neuroendocrine signal providing photoperiodic information to body physiology is the duration of melatonin secretion which reflects the length of the night: longer in the short days of winter and shorter in summer...
May 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28526242/factors-predicting-complications-after-sacral-neuromodulation-in-children
#5
Molly E Fuchs, Peter L Lu, Stephanie J Vyrostek, Steven Teich, Seth A Alpert
OBJECTIVES: To identify if any pre-operative variable are associated with post-operative complications after pediatric sacral neuromodulation (SNM). METHODS: A review of all patients undergoing SNM with an implantable pulse generator at our institution was performed. Post-operative infection, lead migration, lead breakage and need for reoperation were recorded in a prospective database. We collected demographic information and indication for the procedure. We defined indication for procedure as either primarily bowel, or primarily bladder symptoms...
May 16, 2017: Urology
https://www.readbyqxmd.com/read/28526082/proof-of-concept-non-invasive-estimation-of-peripheral-venous-oxygen-saturation
#6
Musabbir Khan, Chris G Pretty, Alexander C Amies, Joel Balmer, Houda E Banna, Geoffrey M Shaw, J Geoffrey Chase
BACKGROUND: Pulse oximeters continuously monitor arterial oxygen saturation. Continuous monitoring of venous oxygen saturation (SvO2) would enable real-time assessment of tissue oxygen extraction (O2E) and perfusion changes leading to improved diagnosis of clinical conditions, such as sepsis. METHODS: This study presents the proof of concept of a novel pulse oximeter method that utilises the compliance difference between arteries and veins to induce artificial respiration-like modulations to the peripheral vasculature...
May 19, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28526073/pulse-wave-velocity-and-cardiac-autonomic-function-in-type-2-diabetes-mellitus
#7
Stamatina Chorepsima, Ioanna Eleftheriadou, Anastasios Tentolouris, Ioannis Moyssakis, Athanasios Protogerou, Alexandros Kokkinos, Petros P Sfikakis, Nikolaos Tentolouris
BACKGROUND: Increased carotid-femoral pulse wave velocity (PWV) has been associated with incident cardiovascular disease, independently of traditional risk factors. Cardiac autonomic dysfunction is a common complication of diabetes and has been associated with reduced aortic distensibility. However, the association of cardiac autonomic dysfunction with PWV is not known. In this study we examined the association between cardiac autonomic function and PWV in subjects with type 2 diabetes mellitus...
May 19, 2017: BMC Endocrine Disorders
https://www.readbyqxmd.com/read/28525970/the-immunoregulatory-role-of-alpha-enolase-in-dendritic-cell-function-during-chlamydia-infection
#8
Khamia Ryans, Yusuf Omosun, Danielle N McKeithen, Tankya Simoneaux, Camilla C Mills, Nathan Bowen, Francis O Eko, Carolyn M Black, Joseph U Igietseme, Qing He
BACKGROUND: We have previously reported that interleukin-10 (IL-10) deficient dendritic cells (DCs) are potent antigen presenting cells that induced elevated protective immunity against Chlamydia. To further investigate the molecular and biochemical mechanism underlying the superior immunostimulatory property of IL-10 deficient DCs we performed proteomic analysis on protein profiles from Chlamydia-pulsed wild-type (WT) and IL-10(-/-) DCs to identify differentially expressed proteins with immunomodulatory properties...
May 19, 2017: BMC Immunology
https://www.readbyqxmd.com/read/28525513/an-observational-assessment-of-anesthesia-capacity-in-madagascar-as-a-prerequisite-to-the-development-of-a-national-surgical-plan
#9
Linden S Baxter, Vaonandianina A Ravelojaona, Hasiniaina N Rakotoarison, Alison Herbert, Emily Bruno, Kristin L Close, Vanessa Andean, Hery H Andriamanjato, Mark G Shrime, Michelle C White
BACKGROUND: The global lack of anesthesia capacity is well described, but country-specific data are needed to provide country-specific solutions. We aimed to assess anesthesia capacity in Madagascar as part of the development of a Ministry of Health national surgical plan. METHODS: As part of a nationwide surgical safety quality improvement project, we surveyed 19 of 22 regional hospitals, representing surgical facilities caring for 75% of the total population. The assessment was divided into 3 areas: anesthesia workforce density, infrastructure and equipment, and medications...
June 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28525298/experimental-and-computational-evidence-on-the-interaction-of-cycloalkyl-%C3%AE-aminobisphosphonates-with-calf-thymus-dna
#10
Mohammad Bagher Gholivand, Hossein Peyman, Khodayar Gholivand, Hamideh Roshanfekr, Avat Arman Taherpour, Rouhollah Yaghoubi
Fluorescence spectroscopy, ultraviolet-visible absorption spectroscopy, circular dichroism spectroscopy, viscometry, cyclic voltammetry, and differential pulse voltammetry were applied to investigate the competitive interaction of DNA with the three new cycloalkyl α-aminobisphosphonates (D1-D3) and spectroscopic probe, neutral red dye, and Hoechst (HO), in a Tris-hydrogen chloride buffer (pH 7.4). The spectroscopic and voltammetric studies showed that the groove binding mode of interaction is predominant in the solution containing DNA and α-aminobisphosphonates...
May 19, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28525271/electron-spin-relaxation-and-biochemical-characterization-of-the-hydrogenase-maturase-hydf-insights-into-2fe-2s-and-4fe-4s-cluster-communication-and-hydrogenase-activation
#11
Eric M Shepard, Amanda S Byer, Priyanka Aggarwal, Jeremiah N Betz, Anna G Scott, Krista Shisler, Robert J Usselman, Gareth R Eaton, Sandra S Eaton, Joan B Broderick
Nature utilizes [FeFe]-hydrogenase enzymes to catalyze the interconversion between H2 and protons and electrons. Catalysis occurs at the H-cluster, a carbon monoxide, cyanide, and dithiomethylamine-coordinated 2Fe subcluster bridged via a cysteine to a [4Fe-4S] cluster. Biosynthesis of this unique metallocofactor is accomplished by three maturase enzymes denoted HydE, HydF, and HydG. HydE and HydG belong to the radical S-adenosylmethionine superfamily of enzymes and synthesize the nonprotein ligands of the H-cluster...
May 19, 2017: Biochemistry
https://www.readbyqxmd.com/read/28524862/antiferromagnetic-cumnas-multi-level-memory-cell-with-microelectronic-compatibility
#12
K Olejník, V Schuler, X Marti, V Novák, Z Kašpar, P Wadley, R P Campion, K W Edmonds, B L Gallagher, J Garces, M Baumgartner, P Gambardella, T Jungwirth
Antiferromagnets offer a unique combination of properties including the radiation and magnetic field hardness, the absence of stray magnetic fields, and the spin-dynamics frequency scale in terahertz. Recent experiments have demonstrated that relativistic spin-orbit torques can provide the means for an efficient electric control of antiferromagnetic moments. Here we show that elementary-shape memory cells fabricated from a single-layer antiferromagnet CuMnAs deposited on a III-V or Si substrate have deterministic multi-level switching characteristics...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524692/electron-nuclear-coupling-through-autoionizing-states-after-strong-field-excitation-of-h_-2-molecules
#13
Yonghao Mi, Nicolas Camus, Lutz Fechner, Martin Laux, Robert Moshammer, Thomas Pfeifer
Channel-selective electron emission from strong-field photoionization of H_{2} molecules is experimentally investigated by using ultrashort laser pulses and a reaction microscope. The electron momenta and energy spectra in coincidence with bound and dissociative ionization channels are compared. Surprisingly, we observed an enhancement of the photoelectron yield in the low-energy region for the bound ionization channel. By further investigation of asymmetrical electron emission using two-color laser pulses, this enhancement is understood as the population of the autoionizing states of H_{2} molecules in which vibrational energy is transferred to electronic energy...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524683/return-to-the-origin-as-a-probe-of-atomic-phase-coherence
#14
Clément Hainaut, Isam Manai, Radu Chicireanu, Jean-François Clément, Samir Zemmouri, Jean Claude Garreau, Pascal Szriftgiser, Gabriel Lemarié, Nicolas Cherroret, Dominique Delande
We report on the observation of the coherent enhancement of the return probability ["enhanced return to the origin" (ERO)] in a periodically kicked cold-atom gas. By submitting an atomic wave packet to a pulsed, periodically shifted, laser standing wave, we induce an oscillation of ERO in time that is explained in terms of a periodic, reversible dephasing in the weak-localization interference sequences responsible for ERO. Monitoring the temporal decay of ERO, we exploit its quantum-coherent nature to quantify the decoherence rate of the atomic system...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524681/phase-shift-in-an-atom-interferometer-due-to-spacetime-curvature-across-its-wave-function
#15
Peter Asenbaum, Chris Overstreet, Tim Kovachy, Daniel D Brown, Jason M Hogan, Mark A Kasevich
Spacetime curvature induces tidal forces on the wave function of a single quantum system. Using a dual light-pulse atom interferometer, we measure a phase shift associated with such tidal forces. The macroscopic spatial superposition state in each interferometer (extending over 16 cm) acts as a nonlocal probe of the spacetime manifold. Additionally, we utilize the dual atom interferometer as a gradiometer for precise gravitational measurements.
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524639/high-dose-intravenous-steroid-pulse-therapy-in-ocular-involvement-of-behcet-s-disease-a-pilot-double-blind-control-study
#16
Mastaneh Mohammadi, Farhad Shahram, Hormoz Shams, Massoomeh Akhlaghi, Farimah Ashofteh, Fereydoun Davatchi
AIM: To evaluate the efficacy of intravenous high-dose pulses of methylprednisolone (IVPM) for treatment of ocular involvement in Behcet's disease (BD). METHOD: In a double-blind control study, we randomized BD patients with posterior uveitis (PU) and/or retinal vasculitis (RV) into two groups. They received either IVPM (1000 mg methylprednisolone) or placebo for 3 consecutive days. Both groups received combination therapy with IV cyclophosphamide, azathioprine and prednisolone for 6 months...
May 19, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28524203/time-resolved-photoelectron-spectroscopy-of-ir-driven-electron-dynamics-in-a-charge-transfer-model-system
#17
Mirjam Falge, Friedrich Georg Fröbel, Volker Engel, Stefanie Gräfe
If the adiabatic approximation is valid, electrons smoothly adapt to molecular geometry changes. In contrast, as a characteristic of diabatic dynamics, the electron density does not follow the nuclear motion. Recently, we have shown that the asymmetry in time-resolved photoelectron spectra serves as a tool to distinguish between these dynamics [Falge et al., J. Phys. Chem. Lett., 2012, 3, 2617]. Here, we investigate the influence of an additional, moderately intense infrared (IR) laser field, as often applied in attosecond time-resolved experiments, on such asymmetries...
May 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28524109/unexpected-infection-spikes-in-a-model-of-respiratory-syncytial-virus-vaccination
#18
Robert J Smith, Alexandra B Hogan, Geoffry N Mercer
Respiratory Syncytial Virus (RSV) is an acute respiratory infection that infects millions of children and infants worldwide. Recent research has shown promise for the development of a vaccine, with a range of vaccine types now in clinical trials or preclinical development. We extend an existing mathematical model with seasonal transmission to include vaccination. We model vaccination both as a continuous process, applying the vaccine during pregnancy, and as a discrete one, using impulsive differential equations, applying pulse vaccination...
May 18, 2017: Vaccines
https://www.readbyqxmd.com/read/28524032/-preoperative-risk-factors-analysis-of-pulmonary-hypertension-crisis-during-perioperative-period-for-caesarean-section-of-woman-with-severe-pulmonary-hypertension
#19
Chunlei Zhang, Yaguang Liu, Enming Qing, Jun Ma
OBJECTIVE: To analyze preoperative risk factors of perioperative pulmonary hypertension crisis (PHC) for pregnant woman with severe pulmonary artery hypertension (PAH), and approach its clinical value. METHODS: A retrospective analysis was conducted. The clinical data from 152 pregnant women with severe PAH underwent cesarean delivery admitted to Beijing Anzhen Hospital from January 1st 2008 to December 31st 2016 was collected. The patients were divided into two groups according to with perioperative PHC or not...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28524027/-effect-of-chest-physiotherapy-in-patients-undergoing-mechanical-ventilation-a-prospective-randomized-controlled-trial
#20
Hui Zeng, Zhen Zhang, Yuan Gong, Miao Chen
OBJECTIVE: To investigate the effect of chest physiotherapy (CPT) on patients undergoing mechanical ventilation (MV). METHODS: A prospective randomized controlled trial (RCT) was conducted. Sixty-eight adult patients undergoing invasive MV over 48 hours admitted to intensive care unit (ICU) of Affiliated Hospital of Zunyi Medical College from December 2014 to October 2016 were enrolled, and they were divided into CPT group (n = 37) and control group (n = 31) by random number table...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
keyword
keyword
117828
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"