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  • 1
    Electronic Resource
    Electronic Resource
    Fluorescence Investigations of “Smart” Microgel Systems (1998)
    Springer
    Journal of fluorescence 8 (1998), S. 343-353 
    Details
    ISSN: 1573-4994
    Keywords: Microgels ; N-isopropylacrylamide ; time-resolved anisotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fluorescence techniques, including lifetime, quenching, and time-resolved anisotropy measurements (TRAMS), were used to study microgel systems based upon N-isopropylacrylamide (NI-PAM) using pyrene as a fluorescent probe. These experiments have revealed that poly(N-isopropylacrylamide) (PNIPAM) nanoparticles undergo a phase transition at a lower critical solution temperature (LCST), of ca. 34°C, which involves collapse of the particles into compacted, hydrophobic spheres. A degree of control over the LCST has been achieved by copolymerization of NIPAM with varying amounts of dimethylacrylamide (DMAC). Incorporation of DMAC into the gel has the effect of changing the hydrophobic to hydrophilic balance and shifts the LCST to a higher temperature. Fluorescence methods indicate that the NIPAM/DMAC gels are of a more open, water-swollen nature above the LCST than that of their PNIPAM counterparts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020572431642
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    Paper (German National Licenses)
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    Substrate-controlled succession of marine bacterioplankton populations induced by a phytoplankton bloom (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-05-05
    Description: Phytoplankton blooms characterize temperate ocean margin zones in spring. We investigated the bacterioplankton response to a diatom bloom in the North Sea and observed a dynamic succession of populations at genus-level resolution. Taxonomically distinct expressions of carbohydrate-active enzymes (transporters; in particular, TonB-dependent transporters) and phosphate acquisition strategies were found, indicating that distinct populations of Bacteroidetes, Gammaproteobacteria, and Alphaproteobacteria are specialized for successive decomposition of algal-derived organic matter. Our results suggest that algal substrate availability provided a series of ecological niches in which specialized populations could bloom. This reveals how planktonic species, despite their seemingly homogeneous habitat, can evade extinction by direct competition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teeling, Hanno -- Fuchs, Bernhard M -- Becher, Dorte -- Klockow, Christine -- Gardebrecht, Antje -- Bennke, Christin M -- Kassabgy, Mariette -- Huang, Sixing -- Mann, Alexander J -- Waldmann, Jost -- Weber, Marc -- Klindworth, Anna -- Otto, Andreas -- Lange, Jana -- Bernhardt, Jorg -- Reinsch, Christine -- Hecker, Michael -- Peplies, Jorg -- Bockelmann, Frank D -- Callies, Ulrich -- Gerdts, Gunnar -- Wichels, Antje -- Wiltshire, Karen H -- Glockner, Frank Oliver -- Schweder, Thomas -- Amann, Rudolf -- New York, N.Y. -- Science. 2012 May 4;336(6081):608-11. doi: 10.1126/science.1218344.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359 Bremen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22556258" target="_blank"〉PubMed〈/a〉
    Keywords: Alphaproteobacteria/enzymology/genetics/*growth & development/metabolism ; Bacterial Proteins/genetics/metabolism ; Bacteroidetes/enzymology/genetics/*growth & development/metabolism ; Diatoms/*growth & development/metabolism ; *Ecosystem ; *Eutrophication ; Gammaproteobacteria/enzymology/genetics/*growth & development/metabolism ; Glycoside Hydrolases/genetics/metabolism ; Membrane Proteins/genetics/metabolism ; Membrane Transport Proteins/genetics/metabolism ; Metagenome ; Microbial Interactions ; North Sea ; Phosphates/metabolism ; Phytoplankton/*growth & development/metabolism ; Seawater/*microbiology ; Sulfatases/genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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