keyword
MENU ▼
Read by QxMD icon Read
search

driving pressure

keyword
https://www.readbyqxmd.com/read/28231637/preen-oil-and-bird-fitness-a-critical-review-of-the-evidence
#1
Gregorio Moreno-Rueda
The uropygial gland is a holocrine complex exclusive to birds that produces an oleaginous secretion (preen oil) whose function is still debated. Herein, I examine critically the evidence for the many hypotheses of potential functions of this gland. The main conclusion is that our understanding of this gland is still in its infancy. Even for functions that are considered valid by most researchers, real evidence is scarce. Although it seems clear that preen oil contributes to plumage maintenance, we do not know whether this is due to a role in reducing mechanical abrasion or in reducing feather degradation by keratinophilic organisms...
February 23, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28227820/evaluating-respiratory-muscle-activity-using-a-wireless-sensor-platform
#2
Luis Estrada, Abel Torres, Leonardo Sarlabous, Raimon Jane, Luis Estrada, Abel Torres, Leonardo Sarlabous, Raimon Jane, Raimon Jane, Luis Estrada, Leonardo Sarlabous, Abel Torres
Wireless sensors are an emerging technology that allows to assist physicians in the monitoring of patients health status. This approach can be used for the non-invasive recording of the electrical respiratory muscle activity of the diaphragm (EMGdi). In this work, we acquired the EMGdi signal of a healthy subject performing an inspiratory load test. To this end, the EMGdi activity was captured from a single channel of electromyography using a wireless platform which was compared with the EMGdi and the inspiratory mouth pressure (Pmouth) recorded with a conventional lab equipment...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226984/analysis-of-causal-cardio-postural-interaction-under-orthostatic-stress-using-convergent-cross-mapping
#3
Ajay K Verma, Amanmeet Garg, Andrew Blaber, Reza Fazel-Rezai, Kouhyar Tavakolian, Ajay K Verma, Amanmeet Garg, Andrew Blaber, Reza Fazel-Rezai, Kouhyar Tavakolian, Ajay K Verma, Amanmeet Garg, Kouhyar Tavakolian, Reza Fazel-Rezai, Andrew Blaber
Knowledge of a cause-and-effect relationship between different physiological systems is helpful in predicting their performance under perturbations, such as orthostatic challenge. The causal coupling between representative signals of the cardiovascular and postural systems under orthostatic challenge remains unknown. Understanding the causal relationship between these two systems is critical, as their interplay is vital to maintain stable upright posture of the human body during quiet standing. In this research, convergent cross mapping (CCM) method was applied to study the causal relationship between the cardiovascular and postural systems previously shown to have coherent activity during quiet standing...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225887/it-is-impossible-to-know-the-way-if-we-do-not-know-where-to-start-tidal-volume-driving-pressure-and-positive-end-expiratory-pressure
#4
Marcelo Cunio Machado Fonseca, Werther Brunow de Carvalho
No abstract text is available yet for this article.
January 1, 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/28224077/electrical-impedance-tomography-and-trans-pulmonary-pressure-measurements-in-a-patient-with-extreme-respiratory-drive
#5
Atsuko Shono, Peter Somhorst, Diederik Gommers
Preserving spontaneous breathing during mechanical ventilation prevents muscle atrophy of the diaphragm, but may lead to ventilator induced lung injury (VILI). We present a case in which monitoring of trans-pulmonary pressure and ventilation distribution using Electrical Impedance Tomography (EIT) provided essential information for preventing VILI.
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28221835/social-information-on-fear-and-food-drives-animal-grouping-and-fitness
#6
Michael A Gil, Zachary Emberts, Harrison Jones, Colette M St Mary
Empirical studies in select systems suggest that social information-the incidental or deliberate information produced by animals and available to other animals-can fundamentally shape animal grouping behavior. However, to understand the role of social information in animal behavior and fitness, we must establish general theory that quantifies effects of social information across ecological contexts and generates expectations that can be applied across systems. Here we used dynamic state variable modeling to isolate effects of social information about food and predators on grouping behavior and fitness...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28219789/acetazolamide-lowers-intracranial-pressure-and-modulates-the-cerebrospinal-fluid-secretion-pathway-in-healthy-rats
#7
Maria Uldall, Hannah Botfield, Inger Jansen-Olesen, Alexandra Sinclair, Rigmor Jensen
Acetazolamide is one of the most widely used drugs for lowering intracranial pressure (ICP) and is believed to reduce cerebrospinal fluid (CSF) secretion via its action on the choroid plexus (CP). In the CP the main driving force for CSF secretion is primarily active transport of Na(+) ions facilitated by the Na/K ATPase. Transmembrane water channels, known as aquaporins (AQP), are also present in the CP and play an important role in the movement of water. In the present study, we investigated the effect of a single dose acetazolamide on the activity of the Na/K ATPase and ICP...
February 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28217786/cavitation-clusters-in-lipid-systems-surface-effects-local-heating-and-streamer-formation
#8
P R Birkin, T M Foley, T T Truscott, A Merritt, S Martini
Cavitation clusters and streamers are characterised in lipid materials (specifically sunflower oil) and compared to water systems. The lipid systems, which are important in food processing, are studied with high-speed camera imaging, laser scattering and pressure measurements. In these oils, clusters formed at an aged (roughened) tip of the sound source (a piston like emitter, PLE) are shown to collapse with varied periodicity in relation to the drive amplitude employed. A distinct streamer (an area of increased flow emanating from the cavitation cluster) is seen in the lipid media which is collimated directly away from the tip of the PLE source whereas in water the cavitation plume is visually less distinct...
February 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28215134/drainage-of-pleural-effusion-improves-diaphragmatic-function-in-mechanically-ventilated-patients
#9
Michele Umbrello, Giovanni Mistraletti, Andrea Galimberti, Ilaria R Piva, Ottavia Cozzi, Paolo Formenti
BACKGROUND: Pleural effusion adversely affects the pressuregenerating capacity of the diaphragm. It uncouples the lung and chest wall, which may result in diaphragmatic dysfunction. Information on the effects of effusion drainage on diaphragmatic function is limited, but several studies report relief of dyspnoea after drainage, which was attributed to improved diaphragmatic mechanics, even if this issue was never formally addressed. OBJECTIVE: To investigate the effect of drainage of unilateral pleural effusion on diaphragmatic function...
March 2017: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/28214036/impact-of-filling-gas-on-subharmonic-emissions-of-phospholipid-ultrasound-contrast-agents
#10
Emma Kanbar, Damien Fouan, Charles A Sennoga, Alexander A Doinikov, Ayache Bouakaz
Subharmonic signals backscattered from gas-filled lipid-shelled microbubbles have generated significant research interest because they can improve the detection and sensitivity of contrast-enhanced ultrasound imaging. However, the emission of subharmonic signals is strongly characterized by a temporal dependence, the origins of which have not been sufficiently elucidated. The features that influence subharmonic emissions need to be identified not only to better develop next-generation microbubble contrast agents, but also to develop more efficient subharmonic imaging (SHI) modes and therapeutic strategies...
February 14, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28213899/human-influence-and-biotic-homogenization-drive-the-distribution-of-escherichia-coli-virulence-genes-in-natural-habitats
#11
Adriana Cabal, Joaquin Vicente, Julio Alvarez, Jose Angel Barasona, Mariana Boadella, Lucas Dominguez, Christian Gortazar
Cattle are the main reservoirs for Shiga-toxin-producing Escherichia coli (STEC), the only known zoonotic intestinal E. coli pathotype. However, there are other intestinal pathotypes that can cause disease in humans, whose presence has been seldom investigated. Thus, our aim was to identify the effects of anthropic pressure and of wild and domestic ungulate abundance on the distribution and diversity of the main human E. coli pathotypes and nine of their representative virulence genes (VGs). We used a quantitative real-time PCR (qPCR) for the direct detection and quantification of the genus-specific gene uidA, nine E...
February 18, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28213202/determinants-of-cough-effectiveness-in-patients-with-respiratory-muscle-weakness
#12
Franco Laghi, Veeranna Maddipati, Timothy Schnell, W Edwin Langbein, Martin J Tobin
Experiments were undertaken to mechanistically define expiratory-muscle contribution to effectiveness of cough while controlling glottic movement. We hypothesized that electrical abdominal-muscle stimulation in patients with respiratory-muscle weakness produces effective coughs only when glottic closure accompanies coughs. In ten spinal-cord-injury patients, esophago-gastric pressure and airflow were recorded during solicited-coughs, coughs augmented by abdominal-muscle stimulation, and passive open-glottis exhalations...
February 14, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28211869/non-apoptotic-cell-death-in-animal-development
#13
REVIEW
Lena M Kutscher, Shai Shaham
Programmed cell death (PCD) is an important process in the development of multicellular organisms. Apoptosis, a form of PCD characterized morphologically by chromatin condensation, membrane blebbing, and cytoplasm compaction, and molecularly by the activation of caspase proteases, has been extensively investigated. Studies in Caenorhabditis elegans, Drosophila, mice, and the developing chick have revealed, however, that developmental PCD also occurs through other mechanisms, morphologically and molecularly distinct from apoptosis...
February 17, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28210935/the-effect-of-fluid-resuscitation-on-the-effective-circulating-volume-in-patients-undergoing-liver-surgery-a-post-hoc-analysis-of-a-randomized-controlled-trial
#14
Jaap Jan Vos, A F Kalmar, H G D Hendriks, J Bakker, T W L Scheeren
To assess the significance of an analogue of the mean systemic filling pressure (Pmsa) and its derived variables, in providing a physiology based discrimination between responders and non-responders to fluid resuscitation during liver surgery. A post-hoc analysis of data from 30 patients undergoing major hepatic surgery was performed. Patients received 15 ml kg(-1) fluid in 30 min. Fluid responsiveness (FR) was defined as an increase of 20% or greater in cardiac index, measured by FloTrac-Vigileo(®). Dynamic preload variables (pulse pressure variation and stroke volume variation: PPV, SVV) were recorded additionally...
February 16, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28210731/pressure-driven-phase-transition-mechanisms-revealed-by-quantum-chemistry-l-serine-polymorphs
#15
Denis A Rychkov, Jernej Stare, Elena V Boldyreva
The present study delivers a computational approach for the understanding of the mechanism of phase transitions between polymorphs of small organic molecules. By using state of the art periodic DFT calculations augmented with dispersion corrections and an external stress tensor together with gas-phase cluster calculations, we thoroughly explained the reversible phase transitions of three polymorphs of the model system, namely crystalline l-serine in the pressure range up to 8 GPa. This study has shown that at the macroscopic level the main driving force of the phase transitions is the decrease in the volume of the crystal unit cell, which contributes to the enthalpy difference between the two forms, but not to the difference in their internal crystal energies...
February 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28208459/channelization-in-porous-media-driven-by-erosion-and-deposition
#16
R Jäger, M Mendoza, H J Herrmann
We develop and validate a new model to study simultaneous erosion and deposition in three-dimensional porous media. We study the changes of the porous structure induced by the deposition and erosion of matter on the solid surface and find that when both processes are active, channelization in the porous structure always occurs. The channels can be stable or only temporary depending mainly on the driving mechanism. Whereas a fluid driven by a constant pressure drop in general does not form steady channels, imposing a constant flux always produces stable channels within the porous structure...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208398/driven-tracers-in-narrow-channels
#17
J Cividini, D Mukamel, H A Posch
Steady-state properties of a driven tracer moving in a narrow two-dimensional (2D) channel of quiescent medium are studied. The tracer drives the system out of equilibrium, perturbs the density and pressure fields, and gives the bath particles a nonzero average velocity, creating a current in the channel. Three models in which the confining effect of the channel is probed are analyzed and compared in this study: the first is the simple symmetric exclusion process (SSEP), for which the stationary density profile and the pressure on the walls in the frame of the tracer are computed...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208194/risk-stratification-for-proven-acute-pulmonary-embolism-what-information-is-needed
#18
Deisy Barrios, Roger D Yusen, David Jiménez
Classification of risk drives treatment decisions for patients with acute symptomatic pulmonary embolism (PE). High-risk patients with acute symptomatic PE have hemodynamic instability (i.e., shock or hypotension present), and treatment guidelines suggest systemically administered thrombolytic therapy in this setting. Normotensive PE patients at low risk for early complications (low-risk PE) might benefit from treatment at home or early discharge, while normotensive patients with preserved systemic arterial pressure deemed as having a high risk for PE-related adverse clinical events (intermediate-high-risk PE) might benefit from close observation and consideration of escalation of therapy...
February 2017: Seminars in Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28202506/recurrent-patterns-of-dna-copy-number-alterations-in-tumors-reflect-metabolic-selection-pressures
#19
Nicholas A Graham, Aspram Minasyan, Anastasia Lomova, Ashley Cass, Nikolas G Balanis, Michael Friedman, Shawna Chan, Sophie Zhao, Adrian Delgado, James Go, Lillie Beck, Christian Hurtz, Carina Ng, Rong Qiao, Johanna Ten Hoeve, Nicolaos Palaskas, Hong Wu, Markus Müschen, Asha S Multani, Elisa Port, Steven M Larson, Nikolaus Schultz, Daniel Braas, Heather R Christofk, Ingo K Mellinghoff, Thomas G Graeber
Copy number alteration (CNA) profiling of human tumors has revealed recurrent patterns of DNA amplifications and deletions across diverse cancer types. These patterns are suggestive of conserved selection pressures during tumor evolution but cannot be fully explained by known oncogenes and tumor suppressor genes. Using a pan-cancer analysis of CNA data from patient tumors and experimental systems, here we show that principal component analysis-defined CNA signatures are predictive of glycolytic phenotypes, including (18)F-fluorodeoxy-glucose (FDG) avidity of patient tumors, and increased proliferation...
February 15, 2017: Molecular Systems Biology
https://www.readbyqxmd.com/read/28196070/differential-paralog-divergence-modulates-genome-evolution-across-yeast-species
#20
Monica R Sanchez, Aaron W Miller, Ivan Liachko, Anna B Sunshine, Bryony Lynch, Mei Huang, Erica Alcantara, Christopher G DeSevo, Dave A Pai, Cheryl M Tucker, Margaret L Hoang, Maitreya J Dunham
Evolutionary outcomes depend not only on the selective forces acting upon a species, but also on the genetic background. However, large timescales and uncertain historical selection pressures can make it difficult to discern such important background differences between species. Experimental evolution is one tool to compare evolutionary potential of known genotypes in a controlled environment. Here we utilized a highly reproducible evolutionary adaptation in Saccharomyces cerevisiae to investigate whether experimental evolution of other yeast species would select for similar adaptive mutations...
February 2017: PLoS Genetics
keyword
keyword
77869
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"