Polarographic determination of the oxygen partial pressure field by Pt microelectrodes using the O2 field in front of a Pt macroelectrode as a model

1974 ◽  
Vol 347 (1) ◽  
pp. 49-61 ◽  
Author(s):  
Horst Baumg�rtl ◽  
Wolfgang Grunewald ◽  
Dietrich W. L�bbers
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Pressure Field ◽  
Polarographic Determination

Ovine ill-thrift in Nova Scotia. 4. The survival at low oxygen partial pressure of fungi isolated from the contents of the ovine rumen

1972 ◽  
Vol 18 (7) ◽  
pp. 1119-1128 ◽  
Author(s):  
D. Brewer ◽  
J. M. Duncan ◽  
S. Safe ◽  
A. Taylor
Keyword(s):  
Carbon Dioxide ◽  
Nova Scotia ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Low Oxygen ◽  
Mucor Rouxii ◽  
Permanent Pasture ◽  
Method Of Determination ◽  
Partial Pressures

Aspergillus fumigatus, Mucor rouxii, and Sporormia minima have been isolated from the rumen contents of sheep grazing permanent pasture at Nappan, Nova Scotia. To determine the ability of these fungi to survive and grow at the low oxygen partial pressure present in the rumen, a method of determination of oxygen, nitrogen, and carbon dioxide has been developed. The lowest partial pressures of oxygen [Formula: see text] and nitrogen that could be detected were 0.0005 cm Hg and the precision of the determination was ±0.001 cm Hg. Carbon dioxide was determined with slightly less precision than achieved for oxygen and nitrogen. Using this method, respiration was detected in cultures of all the fungi named at [Formula: see text] Hg and growth was observed at [Formula: see text] Hg in the case of M. rouxii. It is concluded that all these fungi are capable of survival in the ovine rumen.

Activity Determination of Cobalt in Cobalt–Gold Alloys

1973 ◽  
Vol 51 (14) ◽  
pp. 2362-2365 ◽  
Author(s):  
S. S. Wang ◽  
J. M. Toguri
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Temperature Effect ◽  
Regular Solution ◽  
Cobalt Content ◽  
Gas Mixture ◽  
Liquid Alloys ◽  
Gold Alloys ◽  
Activity Determination

Activities of cobalt in cobalt–gold liquid alloys from 1250 to 1335 °C were determined by equilibrating the alloy with pure solid CoO under a CO/CO2 gas mixture of known oxygen partial pressure. The cobalt activities were calculated from the cobalt content of the alloys after equilibration. The activities of gold were calculated by Gibbs–Duhem integration. In the present study, both activities showed positive deviations from ideality. In the terminal region, the cobalt–gold system was found to behave as a regular solution. The temperature effect on the activities was found to be negligible.

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