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Digitale Medien

Bioleaching of cobalt from smelter wastes byThiobacillus ferrooxidans (1990)

Olson, Gregory J. ; Sakai, Craig K. ; Parks, E. J. ; [weitere]

Springer

Journal of industrial microbiology and biotechnology 6 (1990), S. 49-52

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ISSN: 1476-5535

Schlagwort(e): Leaching ; Metal recovery ; Strategic metal ; Cobalt ; Smelter waste ; Thiobacillus ferrooxidans

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Summary The bioleaching of cobalt from domestic, industrial smelter wastes was studied.Thiobacillus ferrooxidans solubilized Co from sulfidic dross furnace mattes. At pulp densities of 4% (w/v) up to 600 mg of Co per liter of leaching solution was released from nickel matte, corresponding to removal of about two-thirds of the original amount of Co in the matte. Bioleaching methods may be useful as a component of a process for solubilization and recovery of Co from sulfidic smelter mattes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01576176

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Digitale Medien

Raman shifts due to variations in backbone planarity in a group of polydiacetylenes (1998)

Campbell, Alasdair J. ; Davies, Craig K. L. ; Batchelder, David N.

Weinheim : Wiley-Blackwell

Macromolecular Chemistry and Physics 199 (1998), S. 109-112

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ISSN: 1022-1352

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Polydiacetylene xBCMU and 9PA crystals, solutions and solution-cast films vary in colour due to differences in backbone order and planarity. Associated with the colour changes are increases in the Raman frequencies of the triple and double backbone bond vibrational modes from those values found in the highly ordered single crystals. These increases are strongly correlated and the ratio of the change in the frequency of the triple bond mode to that of the double bond mode is found to be 1.6 (±0.1) over a wide variation in order. This ratio is compared with the values of 0.3 found under uniform strain and 1.1 predicted by a model of acetylenic to butatrienic delocalisation. The relationship between the Raman frequencies of the yellow solutions and melts and those of the crystal phases suggests that in the former the backbone has a continuous and smoothly curving ‘worm-like’ conformation. Models involving the break-up of the conjugated system by large-angle bond rotations appear to be incorrect for polydiacetylenes. These results have important consequences for theoretical models that predict the dependence of electron delocalisation on backbone order and planarity in polydiacetylenes.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

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Digitale Medien

Resonant AC-DC magnetic fields: Calculated response (1988)

Durney, Carl H. ; Rushforth, Craig K. ; Anderson, Allen A.

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 9 (1988), S. 315-336

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ISSN: 0197-8462

Schlagwort(e): ELF ; cyclotron resonance ; model ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Physik

Notizen: An elementary model consisting of one charged particle in a viscous medium exposed to weak ac-dc low-frequency magnetic fields is analyzed to identify and explain the fundamental characteristics of the physical mechanisms that result in a resonance response, which is similar to the familiar cyclotron resonance. The model predicts both frequency and amplitude windows, which are explained in terms of synchronization of the particle with electric fields. Although extrapolation of model results to biological systems is limited by the elementary nature of the model, the model results indicate that observed resonant responses by others of biological systems to ac-dc magnetic fields are probably not due to resonant response of ions in solution, since the model predicts that no resonant response is possible unless the viscous damping is very low, many orders of magnitude lower than the viscous damping of ions in solution.

Zusätzliches Material: 16 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bem.2250090402

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