Estimation of oxygen penetration depth in immobilized cells

1988 ◽  
Vol 29 (2-3) ◽  
pp. 107-112 ◽  
Author(s):  
Ho Nam Chang ◽  
Murray Moo-Young
Keyword(s):  
Penetration Depth ◽  
Immobilized Cells ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

Estimation of oxygen penetration depth in immobilized cells

1988 ◽  
Vol 29 (2-3) ◽  
pp. 107-112 ◽  
Author(s):  
Ho Nam Chang ◽  
Murray Moo-Young
Keyword(s):  
Penetration Depth ◽  
Immobilized Cells ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

scholarly journals Controls on the oxygen penetration depth in Ediacaran-Paleozoic benthic ecosystems: A reactive-transport modeling study

2021 ◽  
Author(s):  
Alison Cribb ◽  
Sebastiaan van de Velde ◽  
William Berelson ◽  
David Bottjer ◽  
Frank Corsetti
Keyword(s):  
Penetration Depth ◽  
Reactive Transport ◽  
Transport Modeling ◽  
Reactive Transport Modeling ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth ◽  
Benthic Ecosystems ◽  
Modeling Study

scholarly journals Temperature Dependence of Apparent Respiratory Quotients and Oxygen Penetration Depth in Contrasting Lake Sediments

2017 ◽  
Vol 122 (11) ◽  
pp. 3076-3087 ◽  
Author(s):  
Sebastian Sobek ◽  
Cristian Gudasz ◽  
Birgit Koehler ◽  
Lars J. Tranvik ◽  
David Bastviken ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Lake Sediments ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

scholarly journals Decline of the Black Sea oxygen inventory

2016 ◽  
Vol 13 (4) ◽  
pp. 1287-1297 ◽  
Author(s):  
Arthur Capet ◽  
Emil V. Stanev ◽  
Jean-Marie Beckers ◽  
James W. Murray ◽  
Marilaure Grégoire
Keyword(s):  
Spatial Variability ◽  
Penetration Depth ◽  
Black Sea ◽  
The Black Sea ◽  
Nutrient Loads ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth ◽  
Atmospheric Warming ◽  
The Stability ◽  
Near Future

Abstract. We show that from 1955 to 2015, the inventory of oxygen in the Black Sea has decreased by 44 % and the basin-averaged oxygen penetration depth has decreased from 140 m in 1955 to 90 m in 2015, which is the shallowest annual value recorded during that period. The oxygenated Black Sea surface layer separates the world's largest reservoir of toxic hydrogen sulfide from the atmosphere. The threat of chemocline excursion events led to hot debates in the past decades arguing on the vertical stability of the Black Sea oxic/suboxic interface. In the 1970s and 1980s, when the Black Sea faced severe eutrophication, enhanced respiration rates reduced the thickness of the oxygenated layer. Re-increasing oxygen inventory in 1985–1995 supported arguments in favor of the stability of the oxic layer. Concomitant with a reduction of nutrient loads, it also supported the perception of a Black Sea recovering from eutrophication. More recently, atmospheric warming was shown to reduce the ventilation of the lower oxic layer by lowering cold intermediate layer (CIL) formation rates. The debate on the vertical migration of the oxic interface also addressed the natural spatial variability affecting Black Sea properties when expressed in terms of depth. Here we show that using isopycnal coordinates does not overcome the significant spatial variability of oxygen penetration depth. By considering this spatial variability, the analysis of a composite historical set of oxygen profiles evidenced a significant shoaling of the oxic layer, and showed that the transient "recovery" of the 1990s was mainly a result of increased CIL formation rates during that period. As both atmospheric warming and eutrophication are expected to increase in the near future, monitoring the dynamics of the Black Sea oxic layer is urgently required to assess the threat of further shoaling.

Authigenic uranium: Relationship to oxygen penetration depth and organic carbon rain

2005 ◽  
Vol 69 (1) ◽  
pp. 95-108 ◽  
Author(s):  
James McManus ◽  
William M. Berelson ◽  
Gary P. Klinkhammer ◽  
Douglas E. Hammond ◽  
Chris Holm
Keyword(s):  
Organic Carbon ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

Simple prediction of oxygen penetration depth in biofilms for wastewater treatment

2004 ◽  
Vol 19 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Kazuaki Hibiya ◽  
Jun Nagai ◽  
Satoshi Tsuneda ◽  
Akira Hirata
Keyword(s):  
Wastewater Treatment ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

scholarly journals A Portable Biosensor for 2,4-Dinitrotoluene Vapors

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4247 ◽  
Author(s):  
Marc Prante ◽  
Christian Ude ◽  
Miriam Große ◽  
Lukas Raddatz ◽  
Ulrich Krings ◽  
...  
Keyword(s):  
Cost Effective ◽  
Bacterial Cells ◽  
Explosive Material ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth ◽  
Potential Alternative ◽  
Buried Explosive ◽  
Cell Densities ◽  
Current Detection ◽  
Related Compounds

Buried explosive material, e.g., landmines, represent a severe issue for human safety all over the world. Most explosives consist of environmentally hazardous chemicals like 2,4,6-trinitrotoluene (TNT), carcinogenic 2,4-dinitrotoluene (2,4-DNT) and related compounds. Vapors leaking from buried landmines offer a detection marker for landmines, presenting an option to detect landmines without relying on metal detection. 2,4-Dinitrotoluene (DNT), an impurity and byproduct of common TNT synthesis, is a feasible detection marker since it is extremely volatile. We report on the construction of a wireless, handy and cost effective 2,4-dinitrotoluene biosensor combining recombinant bioluminescent bacterial cells and a compact, portable optical detection device. This biosensor could serve as a potential alternative to the current detection technique. The influence of temperature, oxygen and different immobilization procedures on bioluminescence were tested. Oxygen penetration depth in agarose gels was investigated, and showed that aeration with molecular oxygen is necessary to maintain bioluminescence activity at higher cell densities. Bioluminescence was low even at high cell densities and 2,4-DNT concentrations, hence optimization of different prototypes was carried out regarding radiation surface of the gels used for immobilization. These findings were applied to sensor construction, and 50 ppb gaseous 2,4-DNT was successfully detected.

MAGNETIC CONTROL OF EXCHANGE TORQUES AND THE PENETRATION DEPTH OF MAGNETOSTATIC SURFACE SPIN WAVES

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1159-C1-1161 ◽  
Author(s):  
F. R. MORGENTHALER
Keyword(s):  
Penetration Depth ◽  
Spin Waves ◽  
Magnetic Control ◽  
Surface Spin

A mathematical model for the penetration depth in welding with continuous CO2 lasers

1994 ◽  
Author(s):  
John Dowden ◽  
Robert Ducharme ◽  
Phiroze Kapadia ◽  
Andy Clucas
Keyword(s):  
Mathematical Model ◽  
Penetration Depth ◽  
Co2 Lasers
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