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  • ELECTRONIC EQUIPMENT  (7)
  • denitrification  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of crude oil on denitrification and sulfate reduction in marine sediments (1990)
    Springer
    Biogeochemistry 10 (1990), S. 161-174 
    Details
    ISSN: 1573-515X
    Keywords: denitrification ; Mediterranean ; petroleum enrichment ; sediment ; sulfate-reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The denitrifying activity was measured in different types of sediment from the Mediterranean coast of France before, and after, a massive contamination (30–100 g kg-1 sediment) of hydrocarbons. A closed system was used in order to maintain anoxic conditions and to control substrates and gaseous products concentrations. We have demonstrated that the respiratory metabolism was inhibited in all cases following an incubation time of 20 to 50 days. At this time, the addition of lactate restore the denitrifying activity. The inhibitory effect of crude oil was not related to an alteration of bacterial cells, but to changes in environmental conditions allowing denitrification. The presence of hydrocarbons in the sediments causes a decrease in the redox potential and a concomitant stimulation of the sulfate reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002228
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effects of oxygen on denitrification in marine sediments (1990)
    Springer
    Hydrobiologia 207 (1990), S. 115-122 
    Details
    ISSN: 1573-5117
    Keywords: oxygen ; denitrification ; nitrate reduction ; marine sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experiments were carried out to determine the effect of oxygen on denitrification, simultaneously in sediment and in a bacterial strain isolated from this sediment. Descriptions of the apparatus used are given. In sediment, denitrification was found to occur when the oxygen concentration increased to 5 mg l−1, but the activity was only 10% of that obtained under anaerobic conditions. The two first steps of denitrification measured in the sediment were less sensitive to oxygen. When the sediment was incubated in presence of 1,1 mg l−1 O2, the denitrification rate was never fully restored by returning it to anaerobic conditions. In cell suspensions of the denitrifying bacteria: Ps. nautica isolated from the sediment, denitrification was equally strongly influenced by oxygen. The different steps of denitrification, nitrate, nitrite and nitrous oxide reduction, were differently affected with respect to oxygen concentration. The nitrate reduction was less sensitive than nitrite and nitrous oxide reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041447
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrocarbon influence on denitrification in bioturbated Mediterranean coastal sediments (1997)
    Springer
    Hydrobiologia 345 (1997), S. 67-77 
    Details
    ISSN: 1573-5117
    Keywords: bioturbation ; denitrification ; hydrocarbons ; macrofauna ; organic matter ; in situ experiment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An in situ experiment has been carried out inbioturbated Mediterranean coastal marine sediments (Gulfof Fos) in order to study the influence of hydrocarbons ondenitrification after 1, 4 and 6 months. In theabsence of hydrocarbons in the control sediments, the presenceof macrofauna stimulated denitrificationby 160%. This stimulation is induced by sediment reworkingthat favours both direct NO-3 supply fromthe water column and the penetration of O{2}, which in turnstimulated nitrification, the other source ofNO-3 in sediment. The presence of hydrocarbons in theexperimental sediments either stimulated orinhibited the denitrification. The denitrification response tothe presence of hydrocarbon is dependent onthe quantity of matter buried by the macrofauna activity. Insmall quantities, the organic matter relatedto hydrocarbons 120% enhanced the denitrification compared tothe controls. On the other hand, whenburied hydrocarbon concentrations were higher (〉100 mgsaturated hydrocarbon fraction kg-1 drysediment), the denitrification was inhibited.On the basis of the results obtained, a descriptive model ofthe patterns of denitrification in relation to the presence ofmacrofauna and the distribution ofhydrocarbons in sediments is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002931432250
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous occurrence of denitrification and nitrate ammonification in sediments of the French Mediterranean Coast (1998)
    Springer
    Hydrobiologia 389 (1998), S. 169-182 
    Details
    ISSN: 1573-5117
    Keywords: nitrate ammonification ; denitrification ; 15N ; acetylene ; marine sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissimilatory nitrate reductions in coastal marine sediment of Carteau Cove (French Mediterranean Coast) were studied between April 1993 and July 1994. Simultaneous determination of denitrification and dissimilatory nitrate reduction to ammonium was achieved by using a combination of acetylene blockage and 15N techniques. After short incubations (maximum 5 h), a part of 15N labelled nitrate added to the sediment was recovered as ammonium without incorporation in organic matter. The result indicate that a fraction of nitrate was reduced to ammonium by a dissimilatory mechanism instead of denitrifying. Denitrifying and nitrate ammonifying activities ranged from 0 to 19.8 μmol l-1 d-1 and from 2.3 to 83.2 μmol l-1 d-1, respectively. Denitrification rates were highest in early spring whereas nitrate ammonification were highest in fall. The recovery of nitrate reduced as N2O-N plus ammonium was between 40 and 100%, the highest nitrogen losses were recorded in July. Depending on the station and time of year denitrification accounted for between 0 and 43% of the total nitrate reduction whereas dissimilatory nitrate reduction to ammonium (DNRA) accounted for between 18 and 100%. The reduction rate data suggest that the pathway of nitrate reduction to ammonium may be important in coastal sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003585115481
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  • 5
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    Photon-coupled isolation switch First quarterly report, 1 Jan. - 31 Mar. 1966 (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Photon-coupled isolation switch to provide transistor output electrically isolated from driving sources and all other switch terminals
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-80850 , TI-03-66-87
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Photon-coupled isolation switch Quarterly report, 1 Apr. - 30 Jun. 1966 (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Optoelectronic techniques used to develop photon coupled integrated circuit switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-80820 , TI-03-66-134 , QR-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Photon-coupled isolation switch Quarterly report, 1 Oct. - 31 Dec. 1966 (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Integrated circuit photon coupled isolation switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-84498 , TI-03-67-39
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Photon-coupled isolation switch Quarterly report, 1 Jan. - 31 Mar. 1967 (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Design, development, and testing of new integrated circuit switch device
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-88506 , REPT.-03-67-74 , QR-5
    Format: application/pdf
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  • 9
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    Photon-coupled isolation switch Final report, 1 Jan. 1966 - 31 Mar. 1968 (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electro-optic techniques for developing miniature photon-coupled integrated circuit
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-73640 , REPT-03-68-78
    Format: application/pdf
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  • 10
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    Photon-coupled isolation switch Quarterly report, 1 Jul. - 30 Sep. 1967 (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Development of gallium arsenide laser diode with silicon phototransistor for optical isolation switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-93668 , TI-03-68-14 , QR-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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