Sulphur Activities in Liquid Copper Sulphides

JOM ◽  
1951 ◽  
Vol 3 (3) ◽  
pp. 235-241 ◽  
Author(s):  
R. Schuhmann ◽  
O. W. Moles
Keyword(s):  
Liquid Copper ◽  
Copper Sulphides

The role of calcium in the increase in flocculence of yeast growing in the presence of copper

1965 ◽  
Vol 162 (989) ◽  
pp. 555-566 ◽  
Keyword(s):  
Liquid Medium ◽  
Cell Cultures ◽  
Chloride Solution ◽  
Liquid Copper ◽  
Acquired Resistance ◽  
Calcium Chloride Solution ◽  
Copper Resistance ◽  
Liquid Cultures ◽  
Selection Of

Growth in the presence of inhibitory concentrations of copper enhances the tendency of yeast to flocculate. Many yeasts will not flocculate unless calcium is included in the growth medium and Guinness strain 522 used in the present work required a relatively large amount. Single cell cultures may undergo variation during subculture, resulting in the production of a large number of variants (Chester 1963). The cells of these variants differ considerably in their ability to adhere together. Flocculation variants of strain 522 differed among themselves in the amount of calcium necessary for flocculation, the most flocculent variants requiring least calcium. Washed cells of the more flocculent yeasts removed more calcium from a calcium chloride solution than did those with lesser powers of adhesion. In a copper medium con­taining calcium the more flocculent variants replaced the less flocculent. Calcium protected cells from copper and the more flocculent variants enjoyed most protection. All variants acquired resistance to copper during growth in the copper medium. Despite the selection of the more flocculent yeasts during growth in liquid medium, their copper resistance was less than that of the less flocculent yeasts. When calcium was added to the liquid copper medium, cultures developed less resistance. It is concluded that the less flocculent cells, having less protection by calcium, were exposed to what was effectively a greater concentration of copper and therefore became more resistant. This greater resistance did not enable these cells to compete with the flocculent cells in liquid cultures.

The diffusivity of oxygen in liquid copper-lead alloys

1978 ◽  
Vol 9 (2) ◽  
pp. 21-24 ◽  
Author(s):  
Shinya Otsuka ◽  
Masami Matsuyama ◽  
Zensaku Kozuka
Keyword(s):  
Liquid Copper ◽  
Lead Alloys ◽  
Copper Lead

Mechanochemical transformations and reactivity in copper sulphides

2003 ◽  
Vol 64 (8) ◽  
pp. 1413-1417 ◽  
Author(s):  
P Baláž ◽  
L Takacs ◽  
E Boldižárová ◽  
E Godočı́ková
Keyword(s):  
Copper Sulphides

Thermodynamic properties of liquid copper–indium–tin alloys determined from e.m.f. measurements

2009 ◽  
Vol 41 (2) ◽  
pp. 250-256 ◽  
Author(s):  
Dominika Jendrzejczyk-Handzlik ◽  
Wojciech Gierlotka ◽  
Krzysztof Fitzner
Keyword(s):  
Thermodynamic Properties ◽  
Liquid Copper ◽  
Tin Alloys ◽  
Copper Indium
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