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Digitale Medien

Biogenic silica and phosphorus accumulation in sediments as indices of eutrophication in the Laurentian Great Lakes (1986)

Schelske, C. L. ; Conley, D. J. ; Stoermer, E. F. ; [weitere]

Springer

Hydrobiologia 143 (1986), S. 79-86

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ISSN: 1573-5117

Schlagwort(e): paleolimnology ; diatoms ; nutrients ; phytoplankton production

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Biogenic silica (BSi), total phosphorus (TP), and biologically available phosphorus (AVP) were measured in short cores from Lake Michigan, Lake Erie, and Lake Ontario. Peaks in BSi concentration and peaks in BSi:TP or BSi:AVP ratios provided stratigraphic signals of water column silica (Si) depletion as a response of increased diatom production to P enrichment and decreased diatom production resulting from silica depletion. By contrast the stratigraphic record of P accumulation provided very weak signals of the historical nutrient enrichment in the water column. These results indicate that system P recycling has a higher rate constant than Si recycling and, as a consequence, that relatively small levels of P enrichment can increase diatom production and sedimentation eventually causing Si depletion and Si-limited diatom production in the water mass.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00026648

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Digitale Medien

Corrosion rate measurements in vivo (1967)

Colangelo, V. J. ; Greene, N. D. ; Kettelkamp, D. B. ; [weitere]

Hoboken, NJ : Wiley-Blackwell

Journal of Biomedical Materials Research 1 (1967), S. 405-414

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ISSN: 0021-9304

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Medizin , Technik allgemein

Notizen: Corrosion resistance is particularly important in medical treatments requiring implantation of metallic objects in the human body. Unfortunately, weight loss measurements and other conventional corrosion testing techniques are insufficiently sensitive and difficult to adapt to in vivo environments. The linear polarization technique can be used to remotely meaure the corrosion rates of metals implanted in tissue using needle probes. The principles of this technique are reviewed and the results of tests performed on steel, cobalt, and molybdenum implanted in experimental animals are discussed.

Zusätzliches Material: 7 Ill.