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https://www.readbyqxmd.com/read/29454233/combined-effect-of-water-inundation-and-heavy-metals-on-the-photosynthesis-and-physiology-of-spartina-alterniflora
#1
Xiangli Sun, Yan Xu, Qiqiong Zhang, Xiuzhen Li, Zhongzheng Yan
The frequency and duration of tidal flooding significantly influence the bioavailability of heavy metals (HMs) in sediment and hence exert toxicological effects on coastal wetland plants. In this study, the combined effects of different water inundation times (3, 6, 9, and 12 h) and HMs (Cu, Zn, Pb, and Cr) on the photosynthesis and physiology of Spartina alterniflora were investigated under greenhouse conditions. Results showed that S. alterniflora was somehow tolerant to the combined HMs treatments, and only the highest level of HM treatment decreased leaf chlorophyll content...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29452815/variable-versus-conventional-lung-protective-mechanical-ventilation-during-open-abdominal-surgery-provar-a-randomised-controlled-trial
#2
P M Spieth, A Güldner, C Uhlig, T Bluth, T Kiss, C Conrad, K Bischlager, A Braune, R Huhle, A Insorsi, F Tarantino, L Ball, M J Schultz, N Abolmaali, T Koch, P Pelosi, M Gama de Abreu
BACKGROUND: Experimental studies showed that controlled variable ventilation (CVV) yielded better pulmonary function compared to non-variable ventilation (CNV) in injured lungs. We hypothesized that CVV improves intraoperative and postoperative respiratory function in patients undergoing open abdominal surgery. METHODS: Fifty patients planned for open abdominal surgery lasting >3 h were randomly assigned to receive either CVV or CNV. Mean tidal volumes and PEEP were set at 8 ml kg -1 (predicted body weight) and 5 cm H 2 O, respectively...
March 2018: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29452814/deep-or-awake-removal-of-laryngeal-mask-airway-in-children-at-risk-of-respiratory-adverse-events-undergoing-tonsillectomy-a-randomised-controlled-trial
#3
A Ramgolam, G L Hall, G Zhang, M Hegarty, B S von Ungern-Sternberg
BACKGROUND: Laryngeal mask airways (LMA) are widely used during tonsillectomies. Contrasting evidence exists regarding the timing of the removal and the risk of perioperative respiratory adverse events. We assessed whether the likelihood of perioperative respiratory adverse events is influenced by the timing of LMA removal in children with at least one risk factor for these events. METHODS: Participants (n=290, 0-16 yr) were randomised to have their LMA removed either deep (in theatre by anaesthetist at end-tidal sevoflurane >1 minimum alveolar concentration) or awake (in theatre by anaesthetist or in postanaesthesia care unit by anaesthetist or trained nurse)...
March 2018: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29452100/a-new-noninvasive-method-of-measuring-impaired-pulmonary-gas-exchange-in-lung-disease-an-outpatient-study
#4
John B West, Daniel R Crouch, Janelle M Fine, Dipen Makadia, Daniel L Wang, G Kim Prisk
BACKGROUND: It would be valuable to have a noninvasive method of measuring impaired pulmonary gas exchange in patients with lung disease and so reduce the need for repeated arterial punctures. Here we report the results of using a new test in a group of outpatients attending a pulmonary clinic. METHODS: Inspired and expired P O2 and P CO2 are continually measured by small, rapidly responding analyzers. The arterial P O2 is calculated from the oximeter Sp O2 and the oxygen dissociation curve...
February 13, 2018: Chest
https://www.readbyqxmd.com/read/29448175/metals-in-mangrove-ecosystems-and-associated-biota-a-global-perspective
#5
REVIEW
Rasika Kulkarni, Deepti Deobagkar, Smita Zinjarde
Mangrove forests prevalent along the intertidal regions of tropical and sub-tropical coastlines are inimitable and dynamic ecosystems. They protect and stabilize coastal areas from deleterious consequences of natural disasters such as hurricanes and tsunamis. Although there are reviews on ecological aspects, industrial uses of mangrove-associated microorganisms and occurrence of pollutants in a region-specific manner, there is no exclusive review detailing the incidence of metals in mangrove sediments and associated biota in these ecosystems on a global level...
February 12, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29446714/blunted-shear-mediated-dilation-of-the-internal-but-not-common-carotid-artery-in-response-to-lower-body-negative-pressure
#6
Erika Iwamoto, Joshua M Bock, Darren P Casey
Shear-mediated dilation in peripheral conduit arteries is blunted with sympathetic nervous system (SNS) activation; however, the effect of SNS activation on shear-mediated dilation in carotid arteries is unknown. We hypothesized that SNS activation reduces shear-mediated dilation in common and internal carotid arteries (CCA and ICA, respectively) and this attenuation is greater in the ICA compared to the CCA. Shear-mediated dilation in the CCA and ICA were measured in nine healthy males (24{plus minus}1 yrs) with and without SNS activation...
February 15, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29446020/achieving-an-extraordinary-high-organic-and-hydraulic-loadings-with-good-performance-via-an-alternative-operation-strategy-in-a-multi-stage-constructed-wetland-system
#7
Xiaohong Zhao, Yuansheng Hu, Yaqian Zhao, Lordwin Kumar
In this study, a high organic loading rate of 58-146 g BOD 5 /m 2 day with a hydraulic loading rate (HLR) of 1.63 m 3 /m 2 day and retention time (RT) of 16 h was achieved to maximize the treatment capacity of a four-stage alum sludge-based constructed wetland (CW) system. An alternative operation strategy, i.e., the first stage anaerobic up-flow and the remaining stage tidal flow with effluent recirculation, was investigated to achieve the goal with good treatment performance of 82% COD, 91% BOD 5 , 92% SS, 94% NH 4 -N, and 82% TN removal...
February 14, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29444644/use-of-esophageal-balloon-pressure-volume-curve-analysis-to-determine-esophageal-wall-elastance-and-calibrate-raw-esophageal-pressure-a-bench-experiment-and-clinical-study
#8
Xiu-Mei Sun, Guang-Qiang Chen, Hua-Wei Huang, Xuan He, Yan-Lin Yang, Zhong-Hua Shi, Ming Xu, Jian-Xin Zhou
BACKGROUND: Accurate measurement of esophageal pressure (Pes) depends on proper filling of the balloon. Esophageal wall elastance (Ees) may also influence the measurement. We examined the estimation of balloon-surrounding elastance in a bench model and investigated a simplified calibrating procedure of Pes in a balloon with relatively small volume. METHODS: The Cooper balloon catheter (geometric volume of 2.8 ml) was used in the present study. The balloon was progressively inflated in different gas-tight glass chambers with different inner volumes...
February 14, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29443551/the-role-of-respiration-in-the-cardiovascular-response-to-orthostatic-and-mental-stress
#9
Michal Javorka, Fatima El-Hamad, Barbora Czippelova, Zuzana Turianikova, Jana Krohova, Zuzana Lazarova, Mathias Baumert
The objective of this study was to determine the response of heart rate and blood pressure variability (respiratory sinus arrhythmia, baroreflex sensitivity) to orthostatic and mental stress, focussing on causality and the mediating effect of respiration. Seventy-seven healthy young volunteers (46 f, 31 m) aged 18.4 {plus minus} 2.7 years underwent an experimental protocol comprising: supine rest, 45{degree sign} head-up tilt, recovery, and a mental arithmetic task. Heart rate variability and blood pressure variability were analysed in the time and frequency domain and modelled as a multivariate autoregressive process where the respiratory volume signal acted as an external driver...
February 14, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29439504/comparing-the-potential-of-multispectral-and-hyperspectral-data-for-monitoring-oil-spill-impact
#10
Shruti Khanna, Maria J Santos, Susan L Ustin, Kristen Shapiro, Paul J Haverkamp, Mui Lay
Oil spills from offshore drilling and coastal refineries often cause significant degradation of coastal environments. Early oil detection may prevent losses and speed up recovery if monitoring of the initial oil extent, oil impact, and recovery are in place. Satellite imagery data can provide a cost-effective alternative to expensive airborne imagery or labor intensive field campaigns for monitoring effects of oil spills on wetlands. However, these satellite data may be restricted in their ability to detect and map ecosystem recovery post-spill given their spectral measurement properties and temporal frequency...
February 12, 2018: Sensors
https://www.readbyqxmd.com/read/29438434/seasonal-dynamics-of-the-juvenile-fish-community-structure-in-the-maowei-sea-mangroves
#11
Zhi-Qiang Wu, Qi Zou, Tao Chang, Dong Zhang, Liang-Liang Huang
More than 50% of Chinese mangroves were lost between 1950 and 2000 to habitat destruction, prompting an urge for conservation. To assess the importance of the protected Maowei Gulf mangrove estuary for fish population assemblage in the Beibu Gulf (China), we studied species composition and abundance of juvenile fish (including larvae) from July 2012 to June 2013. A total of 11 691 specimens were collected, which belonged to 24 species and 15 families. Six perciform species constituted 93% of the total sample...
2018: PloS One
https://www.readbyqxmd.com/read/29437939/evolution-of-respiratory-function-in-duchenne-muscular-dystrophy-from-childhood-to-adulthood
#12
Antonella LoMauro, Marianna Romei, Sandra Gandossini, Riccardo Pascuzzo, Simone Vantini, Maria Grazia D'Angelo, Andrea Aliverti
In Duchenne muscular dystrophy (DMD), it is still to be determined if specific timepoints can be identified during the natural evolution of respiratory dysfunction from childhood to adulthood and if scoliosis, steroid therapy and nocturnal noninvasive mechanical ventilation (NIMV) have any effect on it.In a 7-year retrospective study performed on 115 DMD patients (6-24 years), evaluated once or twice per year, with 574 visits in total, evolution mean curves of spirometry, lung volumes, spontaneous breathing and thoraco-abdominal pattern (measured by optoelectronic plethysmography) parameters were obtained by nonlinear regression model analysis...
February 2018: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/29435738/alveolar-tidal-recruitment-derecruitment-and-overdistension-during-four-levels-of-end-expiratory-pressure-with-protective-tidal-volume-during-anesthesia-in-a-murine-lung-healthy-model
#13
Joao Henrique Neves Soares, Alysson Roncally Carvalho, Bruno Curty Bergamini, Maria Alice Kuster Gress, Frederico Caetano Jandre, Walter Araujo Zin, Antonio Giannella-Neto
PURPOSE: We compared respiratory mechanics between the positive end-expiratory pressure of minimal respiratory system elastance (PEEP minErs ) and three levels of PEEP during low-tidal-volume (6 mL/kg) ventilation in rats. METHODS: Twenty-four rats were anesthetized, paralyzed, and mechanically ventilated. Airway pressure (P aw ), flow (F), and volume (V) were fitted by a linear single compartment model (LSCM) P aw (t) = E rs × V(t) + R rs × F(t) + PEEP or a volume- and flow-dependent SCM (VFDSCM) P aw (t) = (E 1 + E 2 × V(t)) × V(t) + (K 1 + K 2 × |F(t)|) × F(t) + PEEP, where E rs and R rs are respiratory system elastance and resistance, respectively; E 1 and E 2 × V are volume-independent and volume-dependent E rs , respectively; and K 1 and K 2 × F are flow-independent and flow-dependent R rs , respectively...
February 12, 2018: Lung
https://www.readbyqxmd.com/read/29434764/pediatric-acute-respiratory-distress-syndrome-current-views
#14
Jinfeng Liu, Wei Wang, Fengli Liu, Zhenguang Li
Acute respiratory distress syndrome (ARDS) mainly involves acute respiratory failure. In addition to this affected patients feel progressive arterial hypoxemia, dyspnea, and a marked increase in the work of breathing. The only clinical solution for the above pathological state is ventilation. Mechanical ventilation is necessary to support life in ARDs but it itself worsen lung injury and the term is known clinically as 'ventilation induced lung injury' (VILI). At the cellular level, respiratory epithelial cells are subjected to cyclic stretch, i...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29434514/lightweight-steel-tidal-power-barrages-with-minimal-environmental-impact-application-to-the-severn-barrage
#15
R C T Rainey
For tidal power barrages, a breast-shot water wheel, with a hydraulic transmission, has significant advantages over a conventional Kaplan turbine. It is better suited to combined operations with pumping that maintain the tidal range upstream of the barrage (important in reducing the environmental impact), and is much less harmful to fish. It also does not require tapered entry and exit ducts, making the barrage much smaller and lighter, so that it can conveniently be built in steel. For the case of the Severn Estuary, UK, it is shown that a barrage at Porlock would generate an annual average power of 4 GW (i...
January 2018: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29433385/intravenous-lidocaine-as-adjuvant-to-general-anesthesia-in-renal-surgery
#16
Mohamed Said Nakhli, Mohamed Kahloul, Taieb Guizani, Chekib Zedini, Ajmi Chaouch, Walid Naija
The role of intraoperative intravenous lidocaine infusion has been previously evaluated for pain relief, inflammatory response, and post-operative recovery, particularly in abdominal surgery. The present study is a randomized double-blinded trial in which we evaluated whether IV lidocaine infusion reduces isoflurane requirement, intraoperative remifentanil consumption and time to post-operative recovery in non-laparoscopic renal surgery. Sixty patients scheduled to undergo elective non-laparoscopic renal surgery under general anesthesia were enrolled to receive either systemic lidocaine infusion (group L: bolus 1...
December 2018: Libyan Journal of Medicine
https://www.readbyqxmd.com/read/29432712/expiratory-flow-limitation-during-mechanical-ventilation
#17
REVIEW
Detajin Junhasavasdikul, Irene Telias, Domenico Luca Grieco, Lu Chen, Cinta Millan Gutierrez, Thomas Piraino, Laurent Brochard
Expiratory flow limitation (EFL) is present when the flow cannot rise despite an increase of the expiratory driving pressure. The mechanisms of EFL are debated but are thought to be related to the collapsibility of small airways. In mechanically ventilated patients, EFL can exist during tidal ventilation, representing an extreme situation where lung volume cannot decrease whatever the expiratory driving forces. It is a key factor for the generation of auto- or intrinsic positive end-expiratory pressure (auto-PEEP or PEEPi) and requires specific management such as positioning and adjustment of external PEEP...
February 9, 2018: Chest
https://www.readbyqxmd.com/read/29432468/effects-of-manual-hyperinflation-clinical-practice-versus-expert-recommendation-on-displacement-of-mucus-simulant-a-laboratory-study
#18
Marcia S Volpe, Juliane M Naves, Gabriel G Ribeiro, Gualberto Ruas, Mauro R Tucci
INTRODUCTION: Manual hyperinflation (MH), a maneuver applied in mechanically ventilated patients to facilitate secretion removal, has large variation in its performance. Effectiveness of MH is usually evaluated by its capacity to generate an expiratory flow bias. The aim of this study was to compare the effects of MH-and its resulting flow bias-applied according to clinical practice versus according to expert recommendation on mucus movement in a lung model simulating a mechanically ventilated patient...
2018: PloS One
https://www.readbyqxmd.com/read/29431887/long-term-organic-carbon-sequestration-in-tidal-marsh-sediments-is-dominated-by-old-aged-allochthonous-inputs-in-a-macro-tidal-estuary
#19
M Van de Broek, C Vandendriessche, D Poppelmonde, R Merckx, S Temmerman, G Govers
Tidal marshes are vegetated coastal ecosystems that are often considered as hotspots of atmospheric CO2 sequestration. Although large amounts of organic carbon (OC) are indeed being deposited on tidal marshes, there is no direct link between high OC deposition rates and high OC sequestration rates due to two main reasons. First, the deposited OC may become rapidly decomposed once it is buried and, second, a significant part of preserved OC may be allochthonous OC that has been sequestered elsewhere. In this study we aimed to identify the mechanisms controlling long-term OC sequestration in tidal marsh sediments along an estuarine salinity gradient (Scheldt estuary, Belgium and The Netherlands)...
February 12, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29431700/influence-of-tidal-volume-and-positive-end-expiratory-pressure-on-ventilation-distribution-and-oxygenation-during-one-lung-ventilation
#20
Zhanqi Zhao, Wei Wang, Zuojing Zhang, Meiying Xu, Inez Frerichs, Jing-Xiang Wu, Knut Moeller
The aim of the study was to explore the feasibility of titrating tidal volume (VT) and positive end-expiratory pressure (PEEP) during one-lung ventilation (OLV) based on ventilation distribution and oxygenation. Approach: Twenty four consecutive patients requiring intubation with a double-lumen tube and subsequent OLV for thoracic surgical procedures were examined prospectively in lateral posture. Electrical impedance tomography (EIT), blood gases, respiratory mechanics were successfully measured in 21 patients at various combinations of VT (4 ml/kg, 6 ml/kg, 8 ml/kg body weight) and PEEP (0 cmH2O, 4 cmH2O, 8 cmH2O) during OLV...
February 12, 2018: Physiological Measurement
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