keyword
MENU ▼
Read by QxMD icon Read
search

Tidal

keyword
https://www.readbyqxmd.com/read/29679831/nitrogen-fate-in-a-subtropical-mangrove-swamp-potential-association-with-seawater-groundwater-exchange
#1
Kai Xiao, Jiapeng Wu, Hailong Li, Yiguo Hong, Alicia M Wilson, Jiu Jimmy Jiao, Meghan Shananan
Coastal mangrove swamps play an important role in nutrient cycling at the land-ocean boundary. However, little is known about the role of periodic seawater-groundwater exchange in the nitrogen cycling processes. Seawater-groundwater exchange rates and inorganic nitrogen concentrations were investigated along a shore-perpendicular intertidal transect in Daya Bay, China. The intertidal transect comprises three hydrologic subzones (tidal creek, mangrove and bare mudflat zones), each with different physicochemical characteristics...
April 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29679819/submarine-groundwater-discharge-and-chemical-behavior-of-tracers-in-laizhou-bay-china
#2
Yan Zhang, Hailong Li, Xuejing Wang, Chaoyue Wang, Kai Xiao, Wenjing Qu
Naturally occurring radon (222 Rn) and radium isotopes are widely used to trace water mixing and submarine groundwater discharge (SGD) in the coastal zones. However, their activities in groundwater are variable both spatially and temporally. Here, time series sampling of 222 Rn and radium was conducted to investigate their behavior in intertidal groundwater of Laizhou Bay, China. The result shows that groundwater redox conditions have an important impact on the behavior of tracers. The activities of tracers will decrease under oxidizing conditions and increase under reducing conditions...
April 18, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29679428/estimating-sensitivity-of-seabed-habitats-to-disturbance-by-bottom-trawling-based-on-the-longevity-of-benthic-fauna
#3
Adriaan D Rijnsdorp, Stefan G Bolam, Clement Garcia, Jan Geert Hiddink, Niels T Hintzen, P Daniel van Denderen, Tobias van Kooten
Bottom fishing such as trawling and dredging may pose serious risks to the seabed and benthic habitats, calling for a quantitative assessment method to evaluate the impact and guide management to develop mitigation measures. We provide a method to estimate the sensitivity of benthic habitats based on the longevity composition of the invertebrate community. We hypothesize that long-lived species are more sensitive to trawling mortality due to their lower pace of life (i.e. slower growth, late maturation). We analyse data from box-core and grab samples taken from 401 stations in the English Channel and southern North Sea to estimate the habitat-specific longevity composition of the benthic invertebrate community and of specific functional groups (i...
April 20, 2018: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/29679183/effects-of-respiratory-and-applied-muscle-tensing-interventions-on-responses-to-a-simulated-blood-draw-among-individuals-with-high-needle-fear
#4
Jennifer M Kowalsky, Robert Conatser, Thomas Ritz, Christopher R France
Fear of blood and needles increases risk for presyncopal symptoms. Applied muscle tension can prevent or attenuate presyncopal symptoms; however, it is not universally effective. This study examined the effects of applied muscle tension, a respiratory intervention, and a no treatment control condition, on presyncopal symptoms and cerebral oxygenation, during a simulated blood draw with individuals highly fearful of needles. Participants (n = 95) completed questionnaires, physiological monitoring, and two trials of a simulated blood draw with recovery...
April 20, 2018: Journal of Behavioral Medicine
https://www.readbyqxmd.com/read/29677673/influence-of-water-management-and-natural-variability-on-dissolved-inorganic-carbon-dynamics-in-a-mangrove-dominated-estuary
#5
Chiara Volta, David T Ho, Gernot Friederich, Victor C Engel, Mahadev Bhat
High-resolution time series measurements of temperature, salinity, pH and pCO2 were made during the period October 2014-September 2015 at the midpoint of Shark River, a 15km tidal river that originates in the freshwater Everglades of south Florida (USA) and discharges into the Gulf of Mexico. Dissolved inorganic carbon dynamics in this system vary over time, and during this study could be classified into three distinct regimes corresponding to October 2014-February 2015 (a wet to dry season transition period), March-May 2015 (dry period) and July-September 2015 (wet period)...
April 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29676628/increasing-the-resolution-of-chronic-obstructive-pulmonary-disease-definition-lessons-from-a-cohort-with-remote-but-extensive-exposure-to-secondhand-tobacco-smoke
#6
Mehrdad Arjomandi, Siyang Zeng, Paul D Blanc, Warren M Gold
RATIONALE: The Global Initiative for Chronic Obstructive Lung Disease criteria require a ratio of forced expiratory volume in 1 second (FEV1 ) to forced vital capacity (FVC) (FEV1 /FVC) of less than 0.70 for the diagnosis of chronic obstructive pulmonary disease, whereas other criteria emphasize a lower limit of normal approach. However, the use of Global Initiative for Chronic Obstructive Lung Disease (or lower limit of normal) criteria may result in classification of many smokers with respiratory morbidities as not having chronic obstructive pulmonary disease...
April 2018: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29674725/droplet-bubbling-evaporatively-cools-a-blowfly
#7
Guilherme Gomes, Roland Köberle, Claudio J Von Zuben, Denis V Andrade
Terrestrial animals often use evaporative cooling to lower body temperature. Evaporation can occur from humid body surfaces or from fluids interfaced to the environment through a number of different mechanisms, such as sweating or panting. In Diptera, some flies move tidally a droplet of fluid out and then back in the buccopharyngeal cavity for a repeated number of cycles before eventually ingesting it. This is referred to as the bubbling behaviour. The droplet fluid consists of a mix of liquids from the ingested food, enzymes from the salivary glands, and antimicrobials, associated to the crop organ system, with evidence pointing to a role in liquid meal dehydration...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674430/rapid-sea-level-rise-in-the-aftermath-of-a-neoproterozoic-snowball-earth
#8
P M Myrow, M P Lamb, R C Ewing
Earth's most severe climate changes occurred during global-scale snowball-Earth glaciations, which profoundly altered Earth's atmosphere, oceans, and biosphere. Extreme rates of glacio-eustatic sea-level rise are a fundamental prediction of the snowball Earth hypothesis, but supporting geologic evidence is lacking. We use paleohydraulic analysis of wave ripples and tidal laminae of the Elatina Formation, Australia - deposited following the Marinoan glaciation ca. 635Ma - to show that water depths of 9-16m remained nearly constant for ~100yrs throughout 27m of sediment accumulation...
April 19, 2018: Science
https://www.readbyqxmd.com/read/29672228/resistive-and-elastic-work-of-breathing-in-older-and-younger-adults-during-exercise
#9
Joshua R Smith, Troy James Cross, Erik H Van Iterson, Bruce D Johnson, Thomas P Olson
It is unknown whether the greater total work of breathing (WOB) with aging is due to greater elastic and/or resistive WOB. We hypothesized that older compared to younger adults would exhibit a greater total WOB at matched ventilations (V̇E ) during graded exercise, secondary to greater inspiratory resistive and elastic as well as expiratory resistive WOB. Older (OA: n=9; 60{plus minus}8 yrs) and younger (YA: n=9; 38{plus minus}7 yrs) adults performed an incremental cycling test to volitional fatigue. Esophageal pressure, inspiratory and expiratory reserve volumes (IRV and ERV, respectively), expiratory flow limitation (EFL), and ventilatory variables were measured at matched V̇E (i...
April 19, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29671605/effects-of-budesonide-and-surfactant-in-preterm-fetal-sheep
#10
T Brett Kothe, Emily Royse, Matthew W Kemp, Augusto F Schmidt, Fabrizio Salomone, Masatoshi Saito, Haruo Usuda, Shimpei Watanabe, Gabrielle C Musk, Alan H Jobe, Noah H Hillman
BACKGROUND: Mechanical ventilation causes lung injury and systemic inflammatory responses in preterm sheep, and is associated with bronchopulmonary dysplasia (BPD) in preterm infants. Budesonide added to surfactant decreased BPD by 20% in infants. OBJECTIVE: Determine the effects of budesonide and surfactant on injury from high tidal volume (VT) ventilation in preterm lambs. METHODS: Ewes at 125 {plus minus} 1 day GA had fetal surgery to expose fetal head and chest with placental circulation intact...
April 19, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29670906/desflurane-attenuates-ventilator-induced-lung-injury-in-rats-with-acute-respiratory-distress-syndrome
#11
Xue Lin, Ying-Nan Ju, Wei Gao, Dong-Mei Li, Chang-Chun Guo
Ventilator-induced lung injury aggravates the existing lung injury. This study investigated the effect of desflurane on VILI in a rat model of acute respiratory distress syndrome. Forty-eight rats were randomized into a sham (S) group, control (C) group, lipopolysaccharide/ventilation (LV) group, lipopolysaccharide/ventilation/desflurane (LVD) group, or lipopolysaccharide/low ventilation with and without desflurane (LLV and LLVD) groups. Rats in the S group received anesthesia only. Rats in the LV and LVD groups received lipopolysaccharide and were ventilated with a high tidal volume...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29670537/impact-of-different-tidal-volume-levels-at-low-mechanical-power-on-ventilator-induced-lung-injury-in-rats
#12
Lillian Moraes, Pedro L Silva, Alessandra Thompson, Cintia L Santos, Raquel S Santos, Marcos V S Fernandes, Marcelo M Morales, Vanessa Martins, Vera L Capelozzi, Marcelo G de Abreu, Paolo Pelosi, Patricia R M Rocco
Tidal volume (VT ) has been considered the main determinant of ventilator-induced lung injury (VILI). Recently, experimental studies have suggested that mechanical power transferred from the ventilator to the lungs is the promoter of VILI. We hypothesized that, as long as mechanical power is kept below a safe threshold, high VT should not be injurious. The present study aimed to investigate the impact of different VT levels and respiratory rates (RR) on lung function, diffuse alveolar damage (DAD), alveolar ultrastructure, and expression of genes related to inflammation [interleukin (IL)-6], alveolar stretch (amphiregulin), epithelial [club cell secretory protein (CC)16] and endothelial [intercellular adhesion molecule (ICAM)-1] cell injury, and extracellular matrix damage [syndecan-1, decorin, and metalloproteinase (MMP)-9] in experimental acute respiratory distress syndrome (ARDS) under low-power mechanical ventilation...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29668325/is-cushing-mechanism-a-dynamic-blood-pressure-stabilizing-system-insights-from-granger-causality-analysis-of-spontaneous-blood-pressure-and-cerebral-blood-flow
#13
Saqib Saleem, Paul D Teal, Connor A Howe, Michael M Tymko, Philip N Ainslie, Yu-Chieh Tzeng
Blood pressure regulation is widely recognised as being integral to the control of end-organ perfusion but it remains unclear whether end-organ perfusion also plays a role in driving changes in blood pressure (BP). A randomized and placebo controlled study design was followed to examine the feedback relationships between very-low-frequency fluctuations in BP and cerebral blood flow (CBF) in humans under placebo treatment and α1-adrenergic blockade. To determine the causal relations among haemodynamic variables, BP, middle cerebral artery blood velocity (MCAv), and end-tidal CO2 time-series were decimated, low-pass filtered (<0...
April 18, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29667182/breathing-regulation-and-blood-gas-homeostasis-after-near-complete-lesions-of-the-retrotrapezoid-nucleus-in-adult-rats
#14
George M P R Souza, Roy Kanbar, Daniel S Stornetta, Stephen B G Abbott, Ruth L Stornetta, Patrice G Guyenet
The retrotrapezoid nucleus (RTN) is one of several CNS nuclei that contribute, in various capacities (e.g. CO2 detection, neuronal modulation) to the central respiratory chemoreflex (CRC). Here we test how important the RTN is to PCO2 homeostasis and breathing during sleep or wake. RTN Nmb positive neurons were killed with targeted microinjections of substance-P-saporin conjugate in adult rats. Under normoxia, rats with large RTN lesions (92 ± 4 % cell loss) had normal blood pressure (BP) and arterial pH but were hypoxic (-8 mmHg PaO2 ) and hypercapnic (+10 mmHg PaCO2 )...
April 18, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29666293/fast-or-slow-rescue-ventilations-a-predictive-model-of-gastric-inflation
#15
John R Fitz-Clarke
BACKGROUND: Rescue ventilations are given during respiratory and cardiac arrest. Tidal volume must assure oxygen delivery; however, excessive pressure applied to an unprotected airway can cause gastric inflation, regurgitation, and pulmonary aspiration. The optimal technique provides mouth pressure and breath duration that minimize gastric inflation. It remains unclear if breath delivery should be fast or slow, and how inflation time affects the division of gas flow between the lungs and esophagus...
April 17, 2018: Respiratory Care
https://www.readbyqxmd.com/read/29665427/end-tidal-co-2-guided-automated-robot-cpr-system-in-the-pig-preliminary-communication
#16
Gil Joon Suh, Jaeheung Park, Jung Chan Lee, Sang Hoon Na, Woon Yong Kwon, Kyung Su Kim, Taegyun Kim, Yoon Sun Jung, Jung-In Ko, So Mi Shin, Kyoung Min You
BACKGROUND: Our aim was to compare the efficacy of the end-tidal CO2 -guided automated robot CPR (robot CPR) system with manual CPR and mechanical device CPR. METHODS: We developed the algorithm of the robot CPR system which automatically finds the optimal compression position under the guidance of end-tidal CO2 feedback in swine models of cardiac arrest. Then, 18 pigs after 11 minutes of cardiac arrest were randomly assigned to one of three groups, robot CPR, LUCAS CPR, and manual CPR groups (n = 6 each group)...
April 14, 2018: Resuscitation
https://www.readbyqxmd.com/read/29664963/trpv4-inhibition-attenuates-stretch-induced-inflammatory-cellular-responses-and-lung-barrier-dysfunction-during-mechanical-ventilation
#17
N Pairet, S Mang, G Fois, M Keck, M Kühnbach, J Gindele, M Frick, P Dietl, D J Lamb
Mechanical ventilation is an important tool for supporting critically ill patients but may also exert pathological forces on lung cells leading to Ventilator-Induced Lung Injury (VILI). We hypothesised that inhibition of the force-sensitive transient receptor potential vanilloid (TRPV4) ion channel may attenuate the negative effects of mechanical ventilation. Mechanical stretch increased intracellular Ca2+ influx and induced release of pro-inflammatory cytokines in lung epithelial cells that was partially blocked by about 30% with the selective TRPV4 inhibitor GSK2193874, but nearly completely blocked with the pan-calcium channel blocker ruthenium red, suggesting the involvement of more than one calcium channel in the response to mechanical stress...
2018: PloS One
https://www.readbyqxmd.com/read/29661979/microelectromechanical-system-gravimeters-as-a-new-tool-for-gravity-imaging
#18
Richard P Middlemiss, Steven G Bramsiepe, Rebecca Douglas, Stefan Hild, James Hough, Douglas J Paul, Antonio Samarelli, Sheila Rowan, Giles D Hammond
A microelectromechanical system (MEMS) gravimeter has been manufactured with a sensitivity of 40 ppb in an integration time of 1 s. This sensor has been used to measure the Earth tides: the elastic deformation of the globe due to tidal forces. No such measurement has been demonstrated before now with a MEMS gravimeter. Since this measurement, the gravimeter has been miniaturized and tested in the field. Measurements of the free-air and Bouguer effects have been demonstrated by monitoring the change in gravitational acceleration measured while going up and down a lift shaft of 20...
May 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29661389/esketamine-counters-opioid-induced-respiratory-depression
#19
K Jonkman, E van Rijnsoever, E Olofsen, L Aarts, E Sarton, M van Velzen, M Niesters, A Dahan
BACKGROUND: Opioids can produce life-threatening respiratory depression. This study tested whether subanaesthetic doses of esketamine stimulate breathing in an established human model of opioid-induced respiratory depression. METHODS: In a study with a randomised, double blind, placebo controlled, crossover design, 12 healthy, young volunteers of either sex received a dose escalating infusion of esketamine (cumulative dose 40 mg infused in 1 h) on top of remifentanil-induced respiratory depression...
May 2018: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29660501/characteristics-of-ch-4-and-co-2-emissions-and-influence-of-water-and-salinity-in-the-yellow-river-delta-wetland-china
#20
Qingfeng Chen, Beibei Guo, Changsheng Zhao, Baoxiu Xing
Due to the severe degradation and environmental pollution of coastal wetlands by human activities, they have gradually become an important source of greenhouse gases (GHGs) emissions, so exploring the characteristics of their emission is important to reduce greenhouse gas emissions from coastal wetlands. In this study, the dynamics of methane (CH4 ) and carbon dioxide (CO2 ) emissions were investigated in five kinds of typical tidal flats from the Yellow River delta wetland during the years 2011-2013, and the influences of water level and salinity on their emissions were explored in laboratory experiments...
April 13, 2018: Environmental Pollution
keyword
keyword
19935
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"