Oxygen dynamics

In a typical experiment by the dynamic gassing-in/gassing-out method during the normal operation of the plant, the air supply is shut off and the dissolved oxygen (DO) concentration is monitored as the DO is depleted. The dissolved oxygen dynamics during the gassing-out part of the experiment are described by... 

Subsequently, during the gassing-in part of the experiment, we can determine kLa. In this case, the dissolved oxygen dynamics are described by... 

R.P. Mason, S. Ran, P.E. Thorpe, Quantitative assessment of tumor oxygen dynamics Molecular Imaging for Prognostic Radiology, J. Cell. Biochem. 87(Suppl.) (2002) 45-53. 

D. Zhao, A. Constantinescu, C.H. Chang, E.W. Hahn, R.P. Mason, Correlation of tumor oxygen dynamics with radiation response of the dunning prostate R3327-HI tumor, Radiat. Res. 159 (2003) 621-631. 

D. Zhao, C. Constantinescu, E.W. Hahn, R.P. Mason, Differential oxygen dynamics in two diverse Dunning prostate R3327 rat tumor sublines (MAT-Lu and HI) with respect to growth and respiratory challenge, Int. J. Radiat. Oncol. Biol. Phys. 53 (2002) 744-756. 

M. Xia, V. Kodibagkar, H. Liu, R.P. Mason, Tumour oxygen dynamics measured simultaneously by near infrared spectroscopy and F magnetic resonance imaging in rats, Phys. Med. Biol. 51 (2006) 45-60. 

Boicourt, W.C. (1990) The influences of circulation processes on dissolved oxygen in Chesapeake Bay. In Oxygen Dynamics in Chesapeake Bay, USA, A Synthesis of Recent Research (Smith, D.E., Leffler, M., and Mackiernan, eds.), pp. 1-59, Maryland Sea Grant, College Park, MD. 

Borsuk, M., Stowe, C., Luettich, R.A., Paerl, H., and Pinckney, I. (2001) Modeling oxygen dynamics in an intermittently stratified estuary estimation of process rates using field data. Estuar. Coastal Shelf Sci. 52, 33 19. 

Kemp, W.M., and Boynton, W.R. (1980) Influence of biological and physical processes on dissolved oxygen dynamics in an estuarine system implications for measurement of community metabolism. Estuar. Coastal Shelf Sci. 11, 407—431. 

Frederiksen, M. S., and Glud, R. N. (2006). Oxygen dynamics in the rhizosphere of Zostera marina A two-dimensional planar optode smdy. Limnol. Oceanogr. 51(2), 1072—1083. 

Precht, E., Franke, U., Polerecky, L., and Huettel, M. (2004). Oxygen dynamics in permeable sediments with wave-driven pore water exchange. Limnol. Oceanogr. 49, 693—705. 

Oxygen dynamics in the deepwater of the central Baltic Sea is a key issue for the cod reproduction in the Baltic. The recruitment of cod depends on egg survival within the halocline, implying that hypoxia or anoxic condition can significantly decline the number of recruits. The ventilation of the deepwater below the halocline is associated with saltwater inflows, but oxygen consumption is mainly due to mineralization of detritus. 

The epoxidation of ethylene which is catalyzed by Ag and promoted by chlorine compounds, for example, is thought to occur in a surface overlayer that has features similar to a melt of Ag ions. The silver-oxychloride reactive surface layer requires Ag + ions (as in the electrochemical system, see Scheme 2.1) to enhance the overall selectivity. Reduced Ag clusters, however, are required to activate molecular oxygen. Dynamic events between these two states are necessary to close the catalytic cycle. Chlorine in combination with Cs is added to promote the Ag catalyst. Eutectic melting points of this phase are close to the reaction temperature 14]... 

When the heat treatment is carried out in the absence of oxygen (dynamic vacuum), the V -oxide side phase is absent [9d] as well as the Sb -oxide phase. XRD pattrans show the... 

Canfield found surprisingly high amounts of oxygen. .. D. E. Canfield et al. Oxygen dynamics in the aftermath of the Great Oxidation of Earth s atmosphere. 2013. Proc Natl Acad Sci. 110(42), p. 16736. DOI 10.1073/pnas.l315570110. 

The process of dynamic quenching is fully reversible, i.e., the dye is not consumed by reaction with oxygen. Dynamic quenching of the fluorophore is responsible for the decrease in fluorescence, and the Stern-Volmer quenching model can be used to express the extent of oxygen quenching ... 

Numerous models for penicillin production are available in the hterature. Some of them are very detailed (Paul et al, 1998) some are less detailed but do take aeration into account (Rodrigues and Filho, 1999 Birol et al., 2002) others ignore the aeration dynamics (van Impe and Bastin, 1995 Betlem et al., 2002). If aeration is sufficient and the oxygen concentration is close to saturation, the oxygen dynamics can indeed be ignored. If aeration is not sufficient, it has a relevant impact on the kinetic equations, and thus on the biomass and penicillin dynamics. 

For TG isothermal small samples weighing less than 10 mg are heated at 160°C/min at a fixed temperature ( 200°Q in oxygen dynamic temperature range 20-50°C, heating rate 0.1-0.4°C/min. 

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