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  • *Bacterial Physiological Phenomena  (3)
  • LDL  (3)
  • 1
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    Chemoattraction to dimethylsulfoniopropionate throughout the marine microbial food web (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-07-22
    Description: Phytoplankton-produced dimethylsulfoniopropionate (DMSP) provides underwater and atmospheric foraging cues for several species of marine invertebrates, fish, birds, and mammals. However, its role in the chemical ecology of marine planktonic microbes is largely unknown, and there is evidence for contradictory functions. By using microfluidics and image analysis of swimming behavior, we observed attraction toward microscale pulses of DMSP and related compounds among several motile strains of phytoplankton, heterotrophic bacteria, and bacterivore and herbivore microzooplankton. Because microbial DMSP cycling is the main natural source of cloud-forming sulfur aerosols, our results highlight how adaptations to microscale chemical seascapes shape planktonic food webs, while potentially influencing climate at the global scale.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seymour, Justin R -- Simo, Rafel -- Ahmed, Tanvir -- Stocker, Roman -- New York, N.Y. -- Science. 2010 Jul 16;329(5989):342-5. doi: 10.1126/science.1188418.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ralph M. Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Justin.Seymour@uts.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20647471" target="_blank"〉PubMed〈/a〉
    Keywords: Alphaproteobacteria/physiology ; Animals ; *Bacterial Physiological Phenomena ; Betaine ; Chemotactic Factors/metabolism ; *Chemotaxis ; Chlorophyta/physiology ; Cues ; Dinoflagellida/physiology ; Ecosystem ; *Food Chain ; Kinetoplastida/physiology ; Microfluidic Analytical Techniques ; Movement ; Phytoplankton/metabolism/*physiology ; Pseudoalteromonas/physiology ; *Seawater/microbiology ; *Sulfonium Compounds/metabolism ; Synechococcus/physiology ; Zooplankton/*physiology
    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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  • 2
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    Trade-offs of chemotactic foraging in turbulent water (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-11-03
    Description: Bacteria play an indispensable role in marine biogeochemistry by recycling dissolved organic matter. Motile species can exploit small, ephemeral solute patches through chemotaxis and thereby gain a fitness advantage over nonmotile competitors. This competition occurs in a turbulent environment, yet turbulence is generally considered inconsequential for bacterial uptake. In contrast, we show that turbulence affects uptake by stirring nutrient patches into networks of thin filaments that motile bacteria can readily exploit. We find that chemotactic motility is subject to a trade-off between the uptake benefit due to chemotaxis and the cost of locomotion, resulting in an optimal swimming speed. A second trade-off results from the competing effects of stirring and mixing and leads to the prediction that chemotaxis is optimally favored at intermediate turbulence intensities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor, John R -- Stocker, Roman -- New York, N.Y. -- Science. 2012 Nov 2;338(6107):675-9. doi: 10.1126/science.1219417.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23118190" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacterial Physiological Phenomena ; *Chemotaxis ; Computer Simulation ; Ecosystem ; *Microbial Interactions ; Movement ; Seawater/*microbiology ; *Water Movements
    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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  • 3
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    Marine microbes see a sea of gradients (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-11-03
    Description: Marine bacteria influence Earth's environmental dynamics in fundamental ways by controlling the biogeochemistry and productivity of the oceans. These large-scale consequences result from the combined effect of countless interactions occurring at the level of the individual cells. At these small scales, the ocean is surprisingly heterogeneous, and microbes experience an environment of pervasive and dynamic chemical and physical gradients. Many species actively exploit this heterogeneity, while others rely on gradient-independent adaptations. This is an exciting time to explore this frontier of oceanography, but understanding microbial behavior and competition in the context of the water column's microarchitecture calls for new ecological frameworks, such as a microbial optimal foraging theory, to determine the relevant trade-offs and global consequences of microbial life in a sea of gradients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stocker, Roman -- 1R01GM100473/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2012 Nov 2;338(6107):628-33. doi: 10.1126/science.1208929.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ralph M. Parsons Laboratory, Department of Civil and Environmental Engineering, 49-213, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. romans@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23118182" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Aquatic Organisms/*physiology ; Bacteria/genetics/growth & development ; *Bacterial Physiological Phenomena ; Biodiversity ; Biological Evolution ; *Chemotaxis ; *Ecosystem ; Environment ; Oceans and Seas ; Seawater/*chemistry/*microbiology ; Water Microbiology
    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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  • 4
    Electronic Resource
    Electronic Resource
    Comparative antioxidant activity of tocotrienols and other natural lipid-soluble antioxidants in a homogeneous system, and in rat and human lipoproteins
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1166 (1993), S. 163-170 
    Details
    ISSN: 0005-2760
    Keywords: LDL ; Lipid peroxidation ; Nutrition ; Peroxyl radical ; Ubiquinol-10 ; Vitamin E
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2760(93)90092-N
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  • 5
    Electronic Resource
    Electronic Resource
    Dietary supplementation with coenzyme Q"1"0 results in increased levels of ubiquinol-10 within circulating lipoproteins and increased resistance of human low-density lipoprotein to the initiation of lipid peroxidation
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1126 (1992), S. 247-254 
    Details
    ISSN: 0005-2760
    Keywords: (Human) ; LDL ; Lipid peroxidation ; Ubiquinol-10
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2760(92)90237-P
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  • 6
    Electronic Resource
    Electronic Resource
    The participation of nitric oxide in cell free- and its restriction of macrophage-mediated oxidation of low-density lipoprotein
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Molecular Basis of Disease 1180 (1992), S. 73-82 
    Details
    ISSN: 0925-4439
    Keywords: 3-Morpholinosydnonimine hydrochloride ; Ahterosclerosis ; LDL ; Lipid peroxidation ; Nitric oxide radical ; Superoxide anion radical
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4439(92)90029-M
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