Oxygen concentration

Xem 1-20 trên 39 kết quả Oxygen concentration
  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: " A local glucose-and oxygen concentration-based insulin secretion model for pancreatic islets Peter Buchwald

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  • Studying the oxygenation kinetics of (19R⁄S,5Z,8Z,11Z,14Z)-19-hydroxy-eicosa-5,8,11,14-tetraenoic acid (19-OH-AA) by rabbit 15-lipoxygenase-1 we observed a pronounced oxygen dependence of the reaction rate, which was not apparent with arachidonic acid as substrate. Moreover, we found that peroxide-dependent activation of the lipoxygenase depended strongly on the oxygen concentration.

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  • This study was performed to develop software sensorsto predict the BOD5 of river water and wastewater. The software sensors were based on the multiple-regression analysis using the dissolved organic carbon(DOC) concentration, UV light absorbance at 254nm and synchronous fluorescence spectra. River water samples and wastewater treatment plant (WWTP)effluents were collected at 1-hour interval to evaluatethe feasibility of the software sensors.

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  • This book describes many aspects of tissue culture models in an extensive manner.

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  • Soil reactivity with chemical oxidants is also important when considering the costs of the use of chemical oxidation. Excessive loss of a chemical oxidant that is reacting with organics in soil, instead of reacting with the contaminants, may preclude the use of the technology as an economically viable approach to site remediation. Different chemical oxidation technologies are most appropriate for particular hydrogeologic conditions. For example, Fenton’s Reagant may not be ideal for groundwater with high concentrations of carbonate.

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  • The answer to this question is partly a matter of perspective. Current scientific evidence suggests that to mitigate the risk of dangerous climate change, global GHG emissions must be reduced by 60 to 80 percent by mid-century, 14 equivalent to many billions of tons of annual reductions. In this context, the contribution of the voluntary carbon offset market – even under the most optimistic demand scenarios – is likely to be small.

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  • In the last year the Blacksmith Institute and Green Cross Switzerland have been using field studies and expertise in pollution analysis to prepare estimates on the contribution of industrial toxic pollutants to the burden of disease. The estimates in this report are based on information collected through the Blacksmith Institutes Toxic Sites Identification Program (TSIP). This program is an ongoing process to identify and screen contaminated sites in low and middle-income countries.

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  • To address these objectives, we collected data and analyzed changes in companies’ choice of auditors and in audit fees, computed concentration ratios and other measures of concentration. We developed an econometric model to evaluate how various factors, including the level of market concentration, could explain fees that public companies paid to their auditors. To obtain the views of public companies and accounting firms on audit competition and challenges, we conducted two surveys.

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  • The purpose of irrigation is to prevent water stress, especially during the formation of the part of the plant that will be harvested. Water stress can occur in a crop when the soil moisture is excessive or when it’s deficient. When oxygen concentration levels in the soil atmosphere are lowered due to displacement by water for an extended period of time, the root system can be severely damaged. Lettuce and green-leaf plants are especially susceptible to water stress due to their shallow root systems.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: The concentration of oxygen, lactate and glucose in the central veins, right heart, and pulmonary artery: a study in patients with pulmonary hypertension...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Effect of Hyperbaric Oxygen Therapy on whole blood cyanide concentrations in carbon monoxide intoxicated patients from fire accident

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  • The care of the critically ill has changed radically during the past 10 years. Technological advances have improved monitoring, organ support, and data collection, while small steps have been made in the development of drug therapies. Conversely, new challenges (e.g. severe acute respiratory syndrome [SARS], multiple antimicrobial resistance, bioterrorism) continue to arise and public expectations are elevated, sometimes to an unreasonable level.

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  • If the soil becomes saturated, oxygen may become scarce and in anoxic conditions, denitrifying bacteria may convert the nitrate to nitrogen gases (NO, N2O, and N2). Nitrogen converted to these gases becomes unavailable for plant uptake or for surface water contamination. Additionally, saturated soil during the growing season is harmful to many crops like maize that cannot tolerate low oxygen concentrations in the root zone for more than a few days.

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành y học tạp chí Medical Sciences dành cho các bạn sinh viên ngành y tham khảo đề tài: OXIDATIVE PHOSPHORYLATION: Kinetic and Thermodynamic Correlation between Electron Flow, Proton Translocation, Oxygen Consumption and ATP Synthesis under Close to In Vivo Concentrations of Oxygen...

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  • Reactionof certainpeptides andproteinswithsingletoxygen (generated by visible light in the presence of rose bengal dye) yields long-lived peptide and protein peroxides. Incubation of these peroxides with glyceraldehyde-3-phosphate dehy-drogenase, in the absence of addedmetal ions, results in loss of enzymatic activity. Comparative studies with a range of peroxides have shown that this inhibition is concentration, peroxide, and time dependent, with H2O2less ecient than some peptide peroxides.

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  • Study on the combustion reaction of cacbon of two kind of coals in the the conditions close to the isothermal, and on the changes of the temperature on the coal surface layer, in the gas and the oxygen concentration depending on the height of the coal layer.

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  • Titration is a versatile analytical procedure that can be used for a wide variety of chemical analyses. For example, when your town’s water supply is tested for purity, or pond water is tested for dissolved oxygen and contaminants, chances are a titration is carried out. Some tests essential for a medical diagnosis require a titration of various body fluids. A titration makes use of a known reaction between two chemicals. A solution of unknown concentration is reacted with a precisely measured amount of another chemical.

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  • Carmago et al. (1992) noted that short-term flow fluctuations, low concentration of dissolved oxygen and also the siltation of suspended inorganic matter caused by industrial discharge contribute greatly to the changes in sediment and directly affect the structure of macroinvertebrate community. The high siltation of suspended inorganic matter caused significant reductions in taxa richness and abundance of zoobenthic communities as it changes the natural structure of the substratum.

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  • Yadav et al. (2007) studied on fertilizer industrial discharge showed that some components in the discharge may interact with each other and produce toxic to aquatic organisms. For instance, the interaction between dissolved oxygen and ammonia changed the respiratory physiology in fresh water fish. In addition, results showed that the toxicity of the effluent in fish depends on concentration and duration of exposure.

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  • Human beings need to breathe oxygen diluted in certain quantity of inert gas for living. In the atmosphere, there is a gas mixture of, mainly, oxygen and nitrogen, in appropriate proportions. However, the air also contains other gases, vapours and aerosols that humans incorporate when breathing and whose composition and concentration vary spatially. Some of these are physiologically inert. Air pollution has become a problem of major concern in the last few decades as it has caused negative effects on human health, nature and properties....

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