نتایج جستجو برای: oxygen enrichment

تعداد نتایج: 249160  

Journal: :FEBS letters 1993
R J Porra W Schäfer E Cmiel I Katheder H Scheer

Using mass spectroscopy, we demonstrate as much as 93% enrichment of the 7-formyl group oxygen of chlorophyll b when dark-grown, etiolated maize leaves are greened under white light in the presence of 18O2. This suggests that a mono-oxygenase is involved in the oxidation of its methyl group precursor. The concomitant enrichment of about 75% of the 13(1)-oxygen confirms the well-documented findi...

2011
Guang-Hao Shen Kun Wang Li-Hua Lu Kang-Ning Xie Qiao-Ling Xu Xiao-Ming Wu Chi Tang Er-Ping Luo

Many people who live in the low altitude areas are often suffered from hypoxia when they entered the high plateau. This problem may seriously influence the physical and mental state and work efficacy for the travelers and workers. Oxygen enrichment of a small space air at high altitude is considered as a simple way to provide lowlanders enriched oxygen for sleeping and resting, improving work e...

2012
S. S. Daood W. Nimmo P. Edge

In this study, a 3D combustion chamber was simulated using FLUENT 6.32. Aim to obtain detailed information on combustion characteristics and _ nitrogen oxides in the furnace and the effect of oxygen enrichment in a combustion process. Oxygenenriched combustion is an effective way to reduce emissions. This paper analyzes NO emission, including thermal NO and prompt NO. Flow rate ratio of air to ...

2013
Arthur Gessler Elke Brandes Claudia Keitel Sonja Boda Zachary E Kayler André Granier Margaret Barbour Graham D Farquhar Kerstin Treydte

The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant-climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues. We studied the oxygen isotopic composition and its enrichment above source water of leaf water over di...

Journal: :Applied and environmental microbiology 1985
D J Burdige K H Nealson

Manganese reduction was catalyzed by enrichment cultures of anaerobic bacteria obtained from coastal marine sediments. In the absence of oxygen, these enrichment cultures reduced manganates when grown on either lactate, succinate, or acetate in both sulfate-free and sulfate-containing artificial seawaters. Sodium azide as well as oxygen completely inhibited microbial manganese reduction by thes...

Journal: :Processes 2021

In this study, a targeted oxygen-enrichment technology was proposed to enhance coal combustion in an ironmaking blast furnace. The flow and characteristics under were investigated using the computational fluid dynamics (CFD) method. results showed that oxygen utilization burnout significantly increased oxygen-enrichment. at 24% O2 concentration 86.29%, which maximum indicated increase of 13.13%...

Journal: :Journal of the Mass Spectrometry Society of Japan 1959

Journal: :Journal of Physics: Conference Series 2017

2007
Prakash Rao Michael Muller

This paper will look at the industrial uses for oxygen. It will categorize oxygen using processes into: 1) the purpose of oxygen in the process and 2) the effect oxygen enrichment has on the overall process. The paper will also look at four methods of producing oxygen: cryogenics, pressure swing absorption, membrane filter technology and electrolysis. It will compare each against one another in...

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