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  • 1
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    The impact of rapid coastline changes and sea level rise on the tides in the Bohai Sea, China (2013)
    Wiley
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    Publication Date: 2013-06-06
    Description: The tidal regime in the Bohai Sea, China, is investigated using observations and an established numerical tidal model. The area has recently experienced rapid coastline changes due to natural developments of the Yellow River delta and large-scale anthropogenic land reclamation. These morphological changes are not reflected in most global bathymetric databases and are thus rarely incorporated into investigations of the Bohai Sea. It is shown that there have indeed been significant changes in the tidal regime in the Bohai Sea over the last 35 years, with M 2 amplitudes changing up to 20 cm in some parts. The model captures some of these changes when the appropriate bathymetries are used. Furthermore, the simulations show that the tides in the Bohai Sea have become more sensitive to future sea level rise and the way in which it is implemented in the model (i.e. whether or not flood defenses are included).These sensitivity changes are due to the recent coastal developments.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Local nanomechanical motion of the cell wall of Saccharomyces cerevisiae (2004)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2004-08-25
    Description: We demonstrate that the cell wall of living Saccharomyces cerevisiae (baker's yeast) exhibits local temperature-dependent nanomechanical motion at characteristic frequencies. The periodic motions in the range of 0.8 to 1.6 kHz with amplitudes of approximately 3 nm were measured using the cantilever of an atomic force microscope (AFM). Exposure of the cells to a metabolic inhibitor causes the periodic motion to cease. From the strong frequency dependence on temperature, we derive an activation energy of 58 kJ/mol, which is consistent with the cell's metabolism involving molecular motors such as kinesin, dynein, and myosin. The magnitude of the forces observed ( approximately 10 nN) suggests concerted nanomechanical activity is operative in the cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pelling, Andrew E -- Sehati, Sadaf -- Gralla, Edith B -- Valentine, Joan S -- Gimzewski, James K -- DK46828/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2004 Aug 20;305(5687):1147-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15326353" target="_blank"〉PubMed〈/a〉
    Keywords: Biomechanical Phenomena ; Cell Wall/*physiology/ultrastructure ; Fourier Analysis ; Microscopy, Atomic Force ; Motion ; Movement ; Saccharomyces cerevisiae/drug effects/*physiology/ultrastructure ; Sodium Azide/pharmacology ; Temperature
    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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    Sea level rise and tidal power plants in the Gulf of Maine (2013)
    Wiley
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    Publication Date: 2013-05-05
    Description: The response of the Bay of Fundy and Gulf of Maine to large scale tidal power plants and future sea-level rise (SLR) is investigated using an established numerical tidal model. Free stream tidal turbines were simulated within the Bay of Fundy by implementing an additional bed friction term, K t . The present day maximum tidal power output was determined to be 7.1 GW, and required K t = 0.03. Extraction at this level would lead to large changes in the tidal amplitudes across the Gulf of Maine. With future SLR implemented the energy available for extraction increases with 0.5-1 GW per m SLR. SLR simulations without tidal power extraction revealed that the response of the semi-diurnal tides to SLR is highly dependent on how changes in sea-level are implemented in the model. When extensive flood defences are assumed at the present day coast line, the response to SLR is far larger than when land is allowed to (permanently) flood. For example, within the Bay of Fundy itself the M 2 amplitude increases with nearly 0.12 m per m SLR without flooding, but it changes with only 0.03 m per m SLR with flooding. We suggest that this is due to the flooding of land cells changing the resonant properties of the basin.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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