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Tidal model

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https://www.readbyqxmd.com/read/29236939/a-proposal-to-explain-how-the-circatidal-rhythm-of-the-arabidopsis-thaliana-root-elongation-rate-could-be-mediated-by-the-lunisolar-gravitational-force-a-quantum-physical-approach
#1
Joachim Fisahn, Peter Barlow, Gerhard Dorda
Background and Aims: Roots of Arabidopsis thaliana exhibit a 24.8 h oscillation of elongation rate when grown under free-running conditions. This growth rhythm is synchronized with the time course of the local lunisolar tidal acceleration. The present study aims at a physiological/physical model to describe the interaction of weak gravitational fields with cellular water dynamics that mediate rhythmic root growth profiles. Methods: Fundamental physical laws are applied to model the water dynamics within single plant cells in an attempt to mimic the 24...
December 10, 2017: Annals of Botany
https://www.readbyqxmd.com/read/29230070/assessing-climate-change-impacts-on-the-stability-of-small-tidal-inlets-part-2-data-rich-environments
#2
Trang Minh Duong, Roshanka Ranasinghe, Marcus Thatcher, Sarith Mahanama, Zheng Bing Wang, Pushpa Kumara Dissanayake, Mark Hemer, Arjen Luijendijk, Janaka Bamunawala, Dano Roelvink, Dirkjan Walstra
Climate change (CC) is likely to affect the thousands of bar-built or barrier estuaries (here referred to as Small tidal inlets - STIs) around the world. Any such CC impacts on the stability of STIs, which governs the dynamics of STIs as well as that of the inlet-adjacent coastline, can result in significant socio-economic consequences due to the heavy human utilisation of these systems and their surrounds. This article demonstrates the application of a process based snap-shot modelling approach, using the coastal morphodynamic model Delft3D, to 3 case study sites representing the 3 main STI types; Permanently open, locationally stable inlets (Type 1), Permanently open, alongshore migrating inlets (Type 2) and Seasonally/Intermittently open, locationally stable inlets (Type 3)...
January 1, 2018: Marine Geology
https://www.readbyqxmd.com/read/29228035/landscape-effects-on-demersal-fish-revealed-by-field-observations-and-predictive-seabed-modelling
#3
Sophie A M Elliott, Alessandro D Sabatino, Michael R Heath, William R Turrell, David M Bailey
Nature conservation and fisheries management often focus on particular seabed features that are considered vulnerable or important to commercial species. As a result, individual seabed types are protected in isolation, without any understanding of what effect the mixture of seabed types within the landscape has on ecosystem functions. Here we undertook predictive seabed modelling within a coastal marine protected area using observations from underwater stereo-video camera deployments and environmental information (depth, wave fetch, maximum tidal speeds, distance from coast and underlying geology)...
2017: PloS One
https://www.readbyqxmd.com/read/29225422/a-mangrove-creek-restoration-plan-utilizing-hydraulic-modeling
#4
Darryl E Marois, William J Mitsch
Despite the valuable ecosystem services provided by mangrove ecosystems they remain threatened around the globe. Urban development has been a primary cause for mangrove destruction and deterioration in south Florida USA for the last several decades. As a result, the restoration of mangrove forests has become an important topic of research. Using field sampling and remote-sensing we assessed the past and present hydrologic conditions of a mangrove creek and its connected mangrove forest and brackish marsh systems located on the coast of Naples Bay in southwest Florida...
November 1, 2017: Ecological Engineering
https://www.readbyqxmd.com/read/29221300/comparison-of-continuous-compression-with-regular-ventilations-versus-30-2-compressions-ventilations-strategy-during-mechanical-cardiopulmonary-resuscitation-in-a-porcine-model-of-cardiac-arrest
#5
Zhengfei Yang, Qingyu Liu, Guanghui Zheng, Zhifeng Liu, Longyuan Jiang, Qing Lin, Rui Chen, Wanchun Tang
Background: A compression-ventilation (C:V) ratio of 30:2 is recommended for adult cardiopulmonary resuscitation (CPR) by the current American Heart Association (AHA) guidelines. However, continuous chest compression (CCC) is an alternative strategy for CPR that minimizes interruption especially when an advanced airway exists. In this study, we investigated the effects of 30:2 mechanical CPR when compared with CCC in combination with regular ventilation in a porcine model. Methods: Sixteen male domestic pigs weighing 39±2 kg were utilized...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29217332/revisiting-high-frequency-oscillatory-ventilation-in-vitro-and-in-silico-in-neonatal-conductive-airways
#6
REVIEW
Katrin Bauer, Eliram Nof, Josué Sznitman
BACKGROUND: High frequency oscillatory ventilation is often used for lung support in premature neonates suffering from respiratory distress syndrome. Despite its broad use in neonatal intensive care units, there are to date no accepted protocols for the choice of appropriate ventilation parameter settings. In this context, the underlying mass transport mechanisms are still not fully understood. METHODS: We revisit the question of flow phenomena under conventional mechanical ventilation and high frequency oscillatory ventilation in an anatomically-inspired model of neonatal conductive airways spanning the first few airway generations...
November 28, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29216437/epha2-modulation-associates-with-protective-effect-of-prone-position-in-ventilator-induced-lung-injury
#7
Byung Hoon Park, Mi Hwa Shin, Ivor S Douglas, Kyung Soo Chung, Joo Han Song, Song Yee Kim, Eun Young Kim, Ji Ye Jung, Young Ae Kang, Joon Chang, Young Sam Kim, Moo Suk Park
The erythropoietin-producing hepatoma receptor tyrosine kinase A2 (EphA2) and its ligand ephrinA1 play a pivotal role in inflammation and tissue injury by modulating the epithelial and endothelial barrier integrity. Therefore, EphA2 receptor may be a potential therapeutic target for modulating ventilator-induced lung injury (VILI). To support this hypothesis, here we analyzed EphA2/ephrinA1 signaling in the process of VILI and determined the role of EphA2/ephrinA1 signaling in the protective mechanism of prone positioning in a VILI model...
December 7, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/29213264/a-novel-halotolerant-thermoalkaliphilic-esterase-from-marine-bacterium-erythrobacter-seohaensis-sw-135
#8
Ying-Yi Huo, Zhen Rong, Shu-Ling Jian, Cao-Di Xu, Jixi Li, Xue-Wei Xu
A novel esterase gene, e69, was cloned from Erythrobacter seohaensis SW-135, which was isolated from a tidal flat sediment of the Yellow Sea in Korea. This gene is 825 bp in length and codes for a 29.54 kDa protein containing 274 amino acids. Phylogenetic analysis showed that E69 is a new member of the bacterial lipolytic enzyme family IV. This enzyme exhibited the highest level of activity toward p-nitrophenyl (NP) butyrate but little or no activity toward the other p-NP esters tested. The optimum temperature and pH of the catalytic activity of E69 were 60°C and pH 10...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29195169/modelling-interactive-effects-of-multiple-disturbances-on-a-coastal-lake-ecosystem-implications-for-management
#9
Hannah F E Jones, Deniz Özkundakci, Chris G McBride, Conrad A Pilditch, Mathew G Allan, David P Hamilton
Coastal lakes, also known as temporarily open/closed estuaries or intermittently closed and open lakes and lagoons, are common worldwide, are typically sites of high biodiversity and often contain abundant macrophyte populations. Anthropogenic stressors such as increased nutrient and sediment loading have adverse effects on submerged macrophytes, and when closed, the lack of tidal flushing makes coastal lakes highly susceptible to eutrophication. Lake openings to the sea may occur naturally, but many coastal lakes are also opened artificially, often to reduce inundation of surrounding land...
November 28, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29190801/comparison-between-manual-and-mechanical-chest-compressions-during-resuscitation-in-a-pediatric-animal-model-of-asphyxial-cardiac-arrest
#10
Jorge López, Sarah N Fernández, Rafael González, María J Solana, Javier Urbano, Blanca Toledo, Jesús López-Herce
AIMS: Chest compressions (CC) during cardiopulmonary resuscitation are not sufficiently effective in many circumstances. Mechanical CC could be more effective than manual CC, but there are no studies comparing both techniques in children. The objective of this study was to compare the effectiveness of manual and mechanical chest compressions with Thumper device in a pediatric cardiac arrest animal model. MATERIAL AND METHODS: An experimental model of asphyxial cardiac arrest (CA) in 50 piglets (mean weight 9...
2017: PloS One
https://www.readbyqxmd.com/read/29189669/measurement-of-dead-space-fraction-upon-icu-admission-predicts-length-of-stay-and-clinical-outcomes-following-bidirectional-cavopulmonary-anastomosis
#11
Claire L Cigarroa, Sarah J van den Bosch, Xiaoqi Tang, Kimberlee Gauvreau, Christopher W Baird, James A DiNardo, John Nagi Kheir
OBJECTIVES: Increased alveolar dead space fraction has been associated with prolonged mechanical ventilation and increased mortality in pediatric patients with respiratory failure. The association of alveolar dead space fraction with clinical outcomes in patients undergoing bidirectional cavopulmonary anastomosis for single ventricle congenital heart disease has not been reported. We describe an association of alveolar dead space fraction with postoperative outcomes in patients undergoing bidirectional cavopulmonary anastomosis...
November 20, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29189269/comparison-of-transcranial-doppler-and-ultrasound-tagged-near-infrared-spectroscopy-for-measuring-relative-changes-in-cerebral-blood-flow-in-human-subjects
#12
Michael S Lipnick, Elizabeth A Cahill, John R Feiner, Philip E Bickler
BACKGROUND: Currently, no reliable method exists for continuous, noninvasive measurements of absolute cerebral blood flow (CBF). We sought to determine how changes measured by ultrasound-tagged near-infrared spectroscopy (UT-NIRS) compare with changes in CBF as measured by transcranial Doppler (TCD) in healthy volunteers during profound hypocapnia and hypercapnia. METHODS: Ten healthy volunteers were monitored with a combination of TCD, UT-NIRS (c-FLOW, Ornim Medical), as well as heart rate, blood pressure, end-tidal PCO2 (PEtCO2), end-tidal O2, and inspired O2...
November 14, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29186183/a-tool-for-simulating-collision-probabilities-of-animals-with-marine-renewable-energy-devices
#13
Pál Schmitt, Ross Culloch, Lilian Lieber, Sverker Molander, Linus Hammar, Louise Kregting
The mathematical problem of establishing a collision probability distribution is often not trivial. The shape and motion of the animal as well as of the the device must be evaluated in a four-dimensional space (3D motion over time). Earlier work on wind and tidal turbines was limited to a simplified two-dimensional representation, which cannot be applied to many new structures. We present a numerical algorithm to obtain such probability distributions using transient, three-dimensional numerical simulations...
2017: PloS One
https://www.readbyqxmd.com/read/29179766/workload-of-horses-on-a-water-treadmill-effect-of-speed-and-water-height-on-oxygen-consumption-and-cardiorespiratory-parameters
#14
Persephone Greco-Otto, Stephanie Bond, Raymond Sides, Grace P S Kwong, Warwick Bayly, Renaud Léguillette
BACKGROUND: Despite the use of water treadmills (WT) in conditioning horses, the intensity of WT exercise has not been well documented. The workload on a WT is a function of water height and treadmill speed. Therefore, the purpose of this study was to determine the effects of these factors on workload during WT exercise. Fifteen client-owned Quarter Horses were used in a randomized, controlled study. Three belt speeds and three water heights (mid cannon, carpus and stifle), along with the control condition (dry treadmill, all three speeds), were tested...
November 28, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29176722/tides-in-the-last-interglacial-insights-from-notch-geometry-and-palaeo-tidal-models-in-bonaire-netherland-antilles
#15
Thomas Lorscheid, Thomas Felis, Paolo Stocchi, J Christina Obert, Denis Scholz, Alessio Rovere
The study of past sea levels relies largely on the interpretation of sea-level indicators. Palaeo tidal notches are considered as one of the most precise sea-level indicators as their formation is closely tied to the local tidal range. We present geometric measurements of modern and palaeo (Marine Isotope Stage (MIS) 5e) tidal notches on Bonaire (southern Caribbean Sea) and results from two tidal simulations, using the present-day bathymetry and a palaeo-bathymetry. We use these two tools to investigate changes in the tidal range since MIS 5e...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29169839/cardiopulmonary-effects-of-anaesthesia-maintained-by-propofol-infusion-versus-isoflurane-inhalation-in-cheetahs-acinonyx-jubatus
#16
Roxanne K Buck, Adrian Sw Tordiffe, Gareth E Zeiler
OBJECTIVE: To compare the cardiopulmonary effects of propofol total intravenous anaesthesia (TIVA) with isoflurane in cheetahs (Acinonyx jubatus) to evaluate feasibility for field use. STUDY DESIGN: Prospective clinical study. ANIMALS: A group of 24 adult cheetahs, 12 per group. METHODS: Cheetahs were immobilized with zolazepam/tiletamine (1.2 mg kg-1) and medetomidine [40 μg kg-1, both intramuscular (IM)] by darting...
June 23, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29164909/analysis-of-breathing-via-optoelectronic-systems-comparison-of-four-methods-for-computing-breathing-volumes-and-thoraco-abdominal-motion-pattern
#17
Carlo Massaroni, Guglielmo Senesi, Emiliano Schena, Sergio Silvestri
Breathing parameters can be measured by motion capture systems by placing photo-reflective markers on the chest wall. A computational model is mandatory to compute the breathing volume and to calculate temporal and kinematical features by the gathered markers trajectories. Despite different methods based on different geometrical approaches can be adopted to compute volumes, no information about their differences in the respiratory evaluation are available. This study investigated the performances of four methods (conventional, prism-based, convex hull with boundary condition, based on Delaunay triangulation) using an optoelectronic motion capture system, on twelve healthy participants during 30 s of breathing...
November 22, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29152933/ventilator-induced-lung-injury-does-it-occur-in-children
#18
Martin C Kneyber
Mechanical ventilation is one of the most practiced interventions in the paediatric intensive care unit (PICU). Although unmistakable life-saving, it can also injury the lung, a process coined ventilator induced lung injury (VILI). To date, almost all of our knowledge VILI has been obtained from studies in adults or experimental studies mimicking the adult critical care situation. This leaves the question if VILI is of importance in the paediatric context. Paediatric clinical studies did not confirm an association between large tidal volume (Vt) and adverse outcome...
November 17, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/29151410/-effects-of-curcumin-on-pulmonary-fibrosis-and-functions-of-paraquat-challenged-rats
#19
Honggang Chen, Rongjia Yang, Yan Tang, Jun Xu, Youfan Feng, Shijie Liu, Shikui Zhang, Lijun Hou
OBJECTIVE: To observe the effects of curcumin on pulmonary fibrosis and functions on paraquat (PQ)-challenged rats, and investigate the possible mechanism. METHODS: 108 SPF Wistar rats were divided into three groups according to random number sheet: normal saline (NS) control group, PQ model group and curcumin-treatment group. The rats in each group were subdivided into three subgroups according to different time points (3, 7, 14 days), with 12 rats in each subgroup...
November 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29148825/on-the-growth-and-detectability-of-land-plants-on-habitable-planets-around-m-dwarfs
#20
Duo Cui, Feng Tian, Yuwei Wang, Changshen Li, Chaoqing Yu, Le Yu
One signature of life on Earth is the vegetation red edge (VRE) feature of land plants, a dramatic change of reflectivity at wavelength near 0.7 μm. Potentially habitable planets around M dwarfs are tidally locked, which can limit the distribution of land plants. In this study, we used a biogeochemical model to investigate the distribution of land plants on potentially habitable planets around M dwarfs driven by climate data produced in a general circulation model (GCM). When considering the effects of clouds, the observation time needed for VRE detection on nearby p = 1 exoplanets around nearby M dwarfs is on the order of days using a 25 m(2) telescope if a large continent faces Earth during observations...
November 17, 2017: Astrobiology
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