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Results 601 - 650 of 2050
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Gonçalves Dias Luis Gustavo Gosuen - - 2009
The influence of 2 different levels of the inspired oxygen fraction (FiO2) on blood gas variables was evaluated in dogs with high intracranial pressure (ICP) during propofol anesthesia (induction followed by a continuous rate infusion [CRI] of 0.6 mg/kg/min) and intermittent positive pressure ventilation (IPPV). Eight adult mongrel dogs were ...
Marcus P M - - 2009
A crystal phase in equilibrium under changing pressure traces out a line in structure space where each point corresponds to a structure. Along that equilibrium line the structure and all static properties describe the static behavior of the phase, including two sets of elastic constants and the bulk modulus. We ...
Dai Lidong - - 2009
This paper describes the development and application of a novel method for the measurement of grain boundary electrical conductivity of rock at high temperature and pressure. In this method, the metal electrodes, the corresponding metal shielding case, and the sleeves are altered in order to appropriately adjust and monitor the ...
Zhu I X - - 2009
Membrane-aerated biofilms with oxygen and nutrients diffusing from the opposite sides possess distinct properties, including the ability to couple aerobic and anaerobic processes. The objective of this study was to examine the effects of oxygen partial pressure and chemical oxygen demand (COD) loading on biofilm properties. Two laboratory-scale membrane-aerated bioreactors ...
Lecoq Jérôme J Institut National de la Santé et de la Recherche Médicale, U603, Paris 75006, - - 2009
The relationship between metabolism of neuronal activity, microvascular organization, and blood flow dynamics is critical for interpreting functional brain imaging. Here we used the rat dorsal olfactory bulb as a model to determine in vivo the correlation between action potential propagation, synaptic transmission, oxygen consumption, and capillary density during odor ...
Ganesh P - - 2009
Recent theoretical simulations using density functional theory (DFT) and novel low temperature high energy x-ray diffraction experiments clearly show the existence of a high pressure morphotropic phase boundary (MPB) in pure PbTiO(3). The experiments show a richer phase diagram than the simulations, with multiple monoclinic phases (Pm and Cm) in ...
Yuge Koretaka - - 2009
Pressure effects on the phase stability of cubic BNC alloys were examined by Monte Carlo simulations and the cluster expansion technique based on first-principles calculations. At pressure P = 10 GPa, solution energy of neighboring B-N and C-C atoms into diamond and cubic BN are both higher than those at P ...
Grocott Michael P W - - 2009
BACKGROUND: The level of environmental hypobaric hypoxia that affects climbers at the summit of Mount Everest (8848 m [29,029 ft]) is close to the limit of tolerance by humans. We performed direct field measurements of arterial blood gases in climbers breathing ambient air on Mount Everest. METHODS: We obtained samples ...
Kasaya Takafumi - - 2009
Sagami Bay is an active tectonic area in Japan. In 1993, a real-time deep sea floor observatory was deployed at 1,175 m depth about 7 km off Hatsushima Island, Sagami Bay to monitor seismic activities and other geophysical phenomena. Video cameras monitored biological activities associated with tectonic activities. The observation ...
Schweiker Katrina L - - 2009
Pressure perturbation calorimetry (PPC) is a new technique that makes possible to study the volumetric changes that occur upon protein unfolding. Here, we summarize the thermodynamic foundation of the method and introduce a two-state model for the analysis of the unfolding data monitored by PPC. Several examples of data analysis ...
Müller Thomas - - 2009
Mortality of severe acute respiratory distress syndrome in adults is still unacceptably high. Extracorporeal membrane oxygenation (ECMO) could represent an important treatment option, if complications were reduced by new technical developments. Efficiency, side effects and outcome of treatment with a new miniaturized device for veno-venous extracorporeal gas transfer were analysed ...
Holden E - - 2009
INTRODUCTION: Oxygen has been shown to improve morbidity, mortality and quality of life in hypoxaemic patients with chronic lung conditions. Assessing compliance has always been difficult and there are no accurate means of assessment available in clinical practice. We have trialled an oxygen compliance monitor called oxymon to address this. ...
Li Xiao-Feng - - 2009
The structural parameters, elastic constants and electronic structure of NbB(2) under pressure are investigated by using first-principles plane-wave pseudopotential density functional theory within the generalized gradient approximation (GGA). The obtained results are in agreement with the available theoretical data. It is found that the elastic constants and the Debye temperature ...
Zhang Jingyun - - 2009
The lattice and elastic instabilities of rocksalt (RS) calcium oxide CaO under pressure are extensively studied to reveal the physically driven mechanism of the phase transition from RS to CsCl structure by using the pseudopotential plane-wave method within density-functional theory. The predicted phase transition pressure is 66.38 GPa, employing the total ...
Stefánsson Einar - - 2009
Vitreous surgery has various physiological and clinical consequences, both beneficial and harmful. Vitrectomy reduces the risk of retinal neovascularization, while increasing the risk of iris neovascularization, reduces macular edema and stimulates cataract formation. These clinical consequences may be understood with the help of classical laws of physics and physiology. The ...
Fornero Jeffrey J - - 2008
Microbial fuel cell (MFC) power densities are often constrained by the oxygen reduction reaction rate on the cathode electrode. One important factor for this is the normally low solubility of oxygen in the aqueous cathode solution, which creates mass transport limitation and hinders oxygen reduction at the electrocatalyst (platinum, Pt). ...
Provenzano David A - - 2008
Spinal cord stimulation (SCS) may be helpful in treating pain and vascular insufficiency associated with inoperable peripheral vascular disease (PVD). Often decision-making regarding progression from trial to implantation is based on subjective measures. Transcutaneous oxygen pressure, a measure of microcirculation and tissue perfusion, provides information on changes that may occur ...
Hermans Greet - - 2008
Extracorporeal membrane oxygenation (ECMO) is a technique that can support gas-exchange and cardiac function in patients with acute respiratory or cardiac failure that is not responsive to conservative treatment. ECMO is a high-risk procedure in critically ill patients and both technical and patient-related complications frequently occur. We report on a ...
Black Ian H - - 2008
INTRODUCTION: Mechanical ventilation of intubated patients is standard to meet oxygenation and ventilation goals. This can require significant energy and oxygen resources. In military operations and mass casualty disasters, oxygen conserving strategies may be important. Low flow tracheal insufflation of oxygen (TRIO) is a technique that provides adequate oxygenation while ...
Gao Changjun - - 2010
BACKGROUND: Many anesthetic methods have been applied to maintain acceptable oxygenation during one-lung ventilation (OLV). However, the optimal management has not been definitely determined. The aim of this study was to investigate whether intravenous hyperoxygenated solution (HOS) infusion would improve systemic oxygenation and reduce intrapulmonary shunt during OLV. MATERIALS AND ...
Mynbaev Ospan A - - 2009
OBJECTIVE: To evaluate the metabolic consequences of the addition of oxygen to the CO(2)-pneumoperitoneum. DESIGN: Prospective randomized study in rabbits. After 30 minutes of ventilation pneumoperitoneum was maintained for 90 minutes with pure CO(2) or CO(2) with 2% or 6% of oxygen. The intraperitoneal pressure was increased from 10 to ...
Lopes Marlene - - 2009
Improvement of microbial cell cultures oxygenation can be achieved by the increase of total air pressure, which increases oxygen solubility in the medium. In this work, a pressurized bioreactor was used for Yarrowia lipolytica batch cultivation under increased air pressure from 1 to 6 bar. Cell growth was strongly enhanced ...
Clark Timothy D - - 2008
This study was undertaken to provide a comprehensive set of data relevant to disclosing the physiological effects and possible oxygen transport limitations in the Chinook salmon (Oncorhynchus tshawytscha) during an acute temperature change. Fish were instrumented with a blood flow probe around the ventral aorta and catheters in the dorsal ...
Lorusso Roberto - - 2009
The aim of the study was to evaluate the effects of phosphorylcholine coating (PC) on intra-operative extracorporeal circulation (ECC) management and perioperative outcome. One hundred and twenty consecutive cardiac surgery patients were enrolled for the study. Patients were randomly assigned to ECC with PC circuits (60 patients) or to corresponding ...
Genç Arzu - - 2008
OBJECTIVES: To investigate respiratory and hemodynamic responses to deep breathing exercise (DBE) during the follow-up period in the intensive care unit after major head and neck surgery. STUDY DESIGN: Prospective study. SUBJECTS AND METHODS: Thirty-five patients were instructed to perform DBE every hour for 3 consecutive hours during the first ...
Kushi Hidehiko - - 2008
The optimum time for commencement of direct hemoperfusion with a polymyxin B immobilized fiber column (DHP-PMX) in patients with sepsis remains unclear. We retrospectively studied the response to DHP-PMX in relation to parameters of oxygen metabolism in 48 patients with sepsis who were divided into two groups. In the effective ...
Bleul Ulrich T - - 2008
OBJECTIVE: To determine the effect of intranasal oxygen administration on blood gas variables and outcome in neonatal calves with respiratory distress syndrome (RDS). DESIGN: Retrospective case series. ANIMALS: 20 neonatal calves with RDS. PROCEDURES: Arterial partial pressure of oxygen (PaO(2)), arterial partial pressure of carbon dioxide, and arterial oxygen saturation ...
Schwartges Ingo - - 2008
OBJECTIVE: To clarify the effects of hypercapnia (increased PaCO2) on gastric mucosal oxygenation during anaesthesia in dogs. DESIGN: Prospective, controlled animal study. SETTING: Experimental research laboratory of an university hospital. SUBJECTS: Six chronically instrumented dogs. INTERVENTIONS: Dogs were anaesthetized (sevoflurane 1.5 MAC), mechanically ventilated (etCO2 = 35 mmHg) and randomly ...
Epari Devakara R - - 2008
Adequate blood supply and sufficient mechanical stability are necessary for timely fracture healing. Damage to vessels impairs blood supply; hindering the transport of oxygen which is an essential metabolite for cells involved in repair. The degree of mechanical stability determines the mechanical conditions in the healing tissues. The mechanical conditions ...
de Andrade Mônica J - - 2008
The successful incorporation of functionalized single-walled carbon nanotubes (f-SWCNTs) into a silica matrix prepared by the sol-gel method is reported herein. SWCNTs produced through catalytic chemical-vapor deposition (CCVD) have been purified and functionalized with sulfuric, nitric and hydrochloric acids to ensure a good dispersion in an aqueous solution. The nanotube ...
Van Meter Keith - - 2008
AIM: This controlled, prospective, randomized porcine study tests the hypothesis that high-dose hyperbaric oxygen (HDHBO2) compared with normobaric oxygen (NBO2) or standard-dose hyperbaric oxygen (SDHBO2), improves return of sustained spontaneous circulation (ROSC) after a normothermic, normobaric, 25-min, non-intervened-upon cardiopulmonary arrest. The study incorporated a direct mechanical ventricular assist device (DMVAD) ...
Muñoz X - - 2008
The present study aimed to assess whether arterial carbon dioxide pressure (Pa,CO(2)) has an impact on agreement between oxygen saturation measured with pulse oximetry (Sp,O(2)) or arterial blood gas co-oximetry (Sa,O(2)). Sa,O(2) and Sp,O(2) determinations were obtained simultaneously from 846 patients under assessment for long-term home oxygen therapy in a ...
Castillo Armando - - 2008
OBJECTIVE: Our aim was to define the relationship of PaO(2) and pulse oxygen saturation values during routine clinical practice and to evaluate whether pulse oxygen saturation values between 85% and 93% were associated with PaO(2) levels of <40 mmHg. METHODS: Prospective comparison of PaO(2) and pulse oxygen saturation values in ...
Celik Sevim - - 2008
OBJECTIVE: To evaluate the effect of transferring open-heart surgery patients from the operating room to the intensive care unit on hemodynamic parameters and blood gases. METHODS: The study was conducted as a prospective, observational study at the German Hospital, Istanbul, Turkey in 2007. Hemodynamic, blood gas values, and oxygen saturation ...
Andrews Tom T School of Nursing and Midwifery, University College Cork, Cork, Ireland. - - 2008
To investigate if patterns of arterial blood gas (ABG) sampling were influenced by values of fractional inspiratory oxygen (FiO2), partial pressure of carbon dioxide (PCO2), partial pressure of oxygen (PO2) and oxygen saturation (%SaO2). An intensive care unit (ICU) in a university teaching hospital located in the North of England, ...
Sechrist J R - - 2008
Hyperbaric oxygen (HBO2) therapy is increasingly used in the treatment of a wide variety of medical conditions. However, for monoplace chambers, there is some uncertainty when sufficiently high oxygen concentrations are attained, because most chambers are not instrumented to measure oxygen. To remedy this, Microsoft Excel-based software, HBO O2 Smart ...
Heinze Hermann - - 2008
BACKGROUND: Functional residual capacity (FRC) measurements may help to guide respiratory therapy. Using the oxygen washout technique, FRC can be assessed at bedside during spontaneous breathing. High repeatability, crucial for monitoring, has not been shown in ventilated patients. A large step change of inspiratory fraction of oxygen (FiO(2)) (DeltaFiO(2)) may ...
Vikram Deepti S DS Center for Biomedical EPR Spectroscopy and Imaging, The Dorothy M. Davis Heart and Lung Research Institute, Department of Internal Medicine, The Ohio State University, 420 West 12th Avenue, TMRF-114, Columbus, OH 43210, - - 2008
The goal of the present study was to evaluate the temporal response of particulate-based EPR oximetry probes to changes in partial pressure of oxygen (pO(2)). In order to accurately evaluate the oxygen-response time, we developed a method for rapid modulation of pO(2) in a chamber containing the probe using an ...
Liou Li-Min - - 2008
OBJECTIVE: To report a rare case of dengue fever presenting with reversible encephalopathy and burst suppression in the EEG. METHODS: We describe an 85-year-old man with dengue encephalopathy and EEG burst suppression and review the related literature. RESULTS: The patient presented with an acute comatose state and absent brainstem reflexes. ...
Koo Namil - - 2008
One key issue for all nanoimprint techniques is an appropriate method for the fabrication of desirable molds. We report on a novel flexible mold fabrication process-pressure-assisted molding (PAM)-for high resolution soft ultraviolet nanoimprint lithography (soft UV-NIL). In PAM, enhanced master filling is achieved by applying an external pressure during the ...
Hatz Sonja - - 2008
Time-resolved singlet oxygen, O(2)(a(1)Delta(g)), phosphorescence experiments have been performed in single cells upon pulsed laser irradiation of a photosensitizer incorporated into the cell. Data recorded as a function of the partial pressure of ambient oxygen to which the cell is exposed reflect apparent values for the intracellular oxygen diffusion coefficient ...
Convertino Victor A - - 2008
BACKGROUND: Most prehospital medical interventions during civilian and military trauma casualty transport fail to utilize advanced decision-support systems for treatment and delivery of medical interventions, particularly intravenous fluids and oxygen. Current treatment protocols are usually based on standard vital signs (eg, blood pressure, arterial oxygen saturation) which have proven to ...
Warnat Jan - - 2008
BACKGROUND/PURPOSE: Reliable information of cerebral oxygenation is-besides the monitoring of the intracranial pressure-of eminent interest when treating patients with brain injuries. In this study, we introduce a new, fast, and sensitive method capable of determining the cortical partial oxygen pressure on the surface of the cortex using a special sensor ...
Anegg U - - 2008
BACKGROUND: The microcirculation and oxygen supply at the oesophagogastric anastomosis are crucial factors that influence anastomotic healing after oesophagectomy. METHODS: Twenty-nine patients (mean age 61.7 years) underwent gastric transposition via an orthotopic (14) or retrosternal (15) route. Interstitial partial pressure of oxygen (PO2) of the stomach in the anastomotic region ...
Oudia Atika - - 2008
The potential of a laccase mediator system on the delignification of Eucalyptus globulus kraft pulp was investigated under diverse operating conditions. A series of enzymatic treatments were performed to determine how biodelignification is influenced by pulp consistency, oxygen pressure, reaction time, dose of laccase, and dose of mediator. The mediator ...
Wong Flora Y - - 2008
OBJECTIVE: The absence of cerebral autoregulation in preterm infants has been associated with adverse outcome, but its bedside assessment in the immature brain is problematic. We used spatially resolved spectroscopy to continuously measure cerebral oxygen saturation (expressed as a tissue-oxygenation index) and used the correlation of tissue-oxygenation index with spontaneous ...
Levin Andrew Ian - - 2008
PURPOSE OF REVIEW: In the presence of the obligatory shunt during one-lung ventilation, arterial oxygenation is determined by the magnitude of the shunt in addition to the oxygen content of the mixed venous blood coursing through that shunt. The present discussion aims to heighten awareness of factors determining arterial oxygenation ...
Barnes Stephen L - - 2008
OBJECTIVE: En-route care necessitates the evacuation of seriously wounded service members requiring mechanical ventilation in aircraft where low light, noise, vibration, and barometric pressure changes create a unique clinical environment. Our goal was to evaluate ventilatory requirements, oxygenation, and oxygen use in flight and assess the feasibility of a computer ...
Cheung Po-Yin - - 2008
OBJECTIVES: We examined the effects of 18%, 21% or 100% oxygen on the recovery of the heart and kidneys in a short-term survival model of neonatal hypoxia-reoxygenation (HR). DESIGN: Controlled, block-randomized animal study. SETTING: University animal research laboratory. SUBJECT: Large White piglets (1-3 days, 1.7-2.5 kg). INTERVENTIONS: Piglets received normocapnic ...
Nishiguchi Brian K - - 2008
BACKGROUND: Transcutaneous monitoring of oxygen and carbon dioxide tension emerged decades ago as reliable, indirect measurements of arterial pressure of oxygen and carbon dioxide in neonates. Investigators have since found other valuable roles for this modality, particularly in critically ill adults. This investigation was undertaken to further characterize these measurements ...
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