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  • 1
    Electronic Resource
    Electronic Resource
    The use of relaxed eddy accumulation to measure biosphere-atmosphere exchange of isoprene and other biological trace gases (1998)
    Springer
    Oecologia 116 (1998), S. 306-315 
    Details
    ISSN: 1432-1939
    Keywords: Key words REA ; Oak-hickory forest ; Isoprene ; Flux ; Eddy covariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The micrometeorological flux measurement technique known as relaxed eddy accumulation (REA) holds promise as a powerful new tool for ecologists. The more popular eddy covariance (eddy correlation) technique requires the use of sensors that can respond at fast rates (10 Hz), and these are unavailable for many ecologically relevant compounds. In contrast, the use of REA allows flux measurement with sensors that have much slower response time, such as gas chromatography and mass spectrometry. In this review, relevant micrometeorological details underlying REA are presented, and critical analytical and system design details are discussed, with the goal of introducing the technique and its potential applications to ecologists. The validity of REA for measuring fluxes of isoprene, a photochemically reactive hydrocarbon emitted by several plant species, was tested with measurements over an oak-hickory forest in the Walker Branch Watershed in eastern Tennessee. Concurrent eddy covariance measurements of isoprene flux were made using a newly available chemiluminesence instrument. Excellent agreement was obtained between the two techniques (r 2 = 0.974, n = 62), providing the first direct comparison between REA and eddy covariance for measuring the flux rate of a reactive compound. The influence of a bias in vertical wind velocity on the accuracy of REA was examined. This bias has been thought to be a source of significant error in the past. Measurements of normalized bias ( ) alone would lead us to think that a large potential error exists at this site. However, with our isoprene data and through simulations of REA with fast-response H2O and CO2 data, we conclude that accurate REA flux measurements can be made even in the presence of a bias in w.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050592
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical and biochemical analyses of tibial compartment fascia in chronic compartment syndrome (1994)
    Springer
    Annals of biomedical engineering 22 (1994), S. 272-279 
    Details
    ISSN: 1573-9686
    Keywords: Chronic compartment syndrome ; Fascia ; Elasticity ; Viscoelasticity ; Collagen ; Collagen crosslinking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Increases in compartment pressure associated with chronic compartment syndrome (CCS) may be due to changes in the mechanical properties and/or thickness of fascia (4,22). To explore this possibility, we compared the mechanical and biochemical characteristics (stiffness, thickness, time-dependent response, collagen content, and collagen crosslinking) of fascia from patients with symptomatic anterior compartment syndrome to fascia from adjacent collateral compartments. We tested 43 specimens harvested from 20 individuals during surgical fasciectomy. Properties of normal (lateral)-compartment (NC) and pathological (anterior)-compartment (PC) fascia were mechanically tested in the axial and transverse directions forming four groups. An external control group (EX) of six specimens of anterior and lateral-compartment fascia harvested from amputated legs was also included in the study. PC fascia was found to be thicker and structurally stiffer (elastic modulus times thickness) in the axial direction than was NC fascia (p≤0.05). No significant differences were found between NC and PC time-dependent response, although significant differences between percent relaxation in the pooled axial and transverse direction specimens were observed. No differences were found in the collagen content, as measured by hydroxyproline (Hyp) concentration, between NC and PC fascia. PC fascia was found to have less collagen crosslinking by hydroxylyslpyridinoline (HP) concentration. In conclusion, although this study does not elucidate etiological factors in CCS, the changes found in PC fascia suggest that fascial mechanical properties contribute to the pathology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02368234
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  • 3
    Electronic Resource
    Electronic Resource
    Spatial Variability of Turbulent Fluxes in the Roughness Sublayer of an Even-Aged Pine Forest (1999)
    Springer
    Boundary layer meteorology 93 (1999), S. 1-28 
    Details
    ISSN: 1573-1472
    Keywords: Canopy turbulence ; Moving equilibrium hypothesis ; Planar homogeneity ; Roughness sublayer ; Spatial variability ; Turbulent fluxes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The spatial variability of turbulent flow statistics in the roughness sublayer (RSL) of a uniform even-aged 14 m (= h) tall loblolly pine forest was investigated experimentally. Using seven existing walkup towers at this stand, high frequency velocity, temperature, water vapour and carbon dioxide concentrations were measured at 15.5 m above the ground surface from October 6 to 10 in 1997. These seven towers were separated by at least 100m from each other. The objective of this study was to examine whether single tower turbulence statistics measurements represent the flow properties of RSL turbulence above a uniform even-aged managed loblolly pine forest as a best-case scenario for natural forested ecosystems. From the intensive space-time series measurements, it was demonstrated that standard deviations of longitudinal and vertical velocities (σu, σw) and temperature (σT) are more planar homogeneous than their vertical flux of momentum (u* 2) and sensible heat (H) counterparts. Also, the measured H is more horizontally homogeneous when compared to fluxes of other scalar entities such as CO2 and water vapour. While the spatial variability in fluxes was significant (〉15 %), this unique data set confirmed that single tower measurements represent the ‘canonical’ structure of single-point RSL turbulence statistics, especially flux-variance relationships. Implications to extending the ‘moving-equilibrium’ hypothesis for RSL flows are discussed. The spatial variability in all RSL flow variables was not constant in time and varied strongly with spatially averaged friction velocity u*, especially when u* was small. It is shown that flow properties derived from two-point temporal statistics such as correlation functions are more sensitive to local variability in leaf area density when compared to single point flow statistics. Specifically, that the local relationship between the reciprocal of the vertical velocity integral time scale (Iw) and the arrival frequency of organized structures (ū/h) predicted from a mixing-layer theory exhibited dependence on the local leaf area index. The broader implications of these findings to the measurement and modelling of RSL flows are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002079602069
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  • 4
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    Foreword: Function, Classification and Management of Asian Wetlands (2014)
    Springer
    Details
    Publication Date: 2014-02-28
    Print ISSN: 0277-5212
    Electronic ISSN: 1943-6246
    Topics: Biology
    Published by Springer
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  • 5
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    Biogeography and ecological setting of Indian Ocean hydrothermal vents (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-15
    Description: Within the endemic invertebrate faunas of hydrothermal vents, five biogeographic provinces are recognized. Invertebrates at two Indian Ocean vent fields (Kairei and Edmond) belong to a sixth province, despite ecological settings and invertebrate-bacterial symbioses similar to those of both western Pacific and Atlantic vents. Most organisms found at these Indian Ocean vent fields have evolutionary affinities with western Pacific vent faunas, but a shrimp that ecologically dominates Indian Ocean vents closely resembles its Mid-Atlantic counterpart. These findings contribute to a global assessment of the biogeography of chemosynthetic faunas and indicate that the Indian Ocean vent community follows asymmetric assembly rules biased toward Pacific evolutionary alliances.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Dover, C L -- Humphris, S E -- Fornari, D -- Cavanaugh, C M -- Collier, R -- Goffredi, S K -- Hashimoto, J -- Lilley, M D -- Reysenbach, A L -- Shank, T M -- Von Damm, K L -- Banta, A -- Gallant, R M -- Gotz, D -- Green, D -- Hall, J -- Harmer, T L -- Hurtado, L A -- Johnson, P -- McKiness, Z P -- Meredith, C -- Olson, E -- Pan, I L -- Turnipseed, M -- Won, Y -- Young, C R 3rd -- Vrijenhoek, R C -- New York, N.Y. -- Science. 2001 Oct 26;294(5543):818-23. Epub 2001 Sep 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology Department, College of William & Mary, Williamsburg, VA 23187, USA. cindy_vandover@wm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11557843" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/classification/isolation & purification ; *Bacterial Physiological Phenomena ; Biological Evolution ; Biomass ; Decapoda (Crustacea)/classification/physiology ; *Ecosystem ; Euryarchaeota/classification/isolation & purification/physiology ; Geography ; *Geologic Sediments/microbiology ; Hot Temperature ; Invertebrates/classification/microbiology/*physiology ; Molecular Sequence Data ; Mollusca/classification/physiology ; Oceans and Seas ; Seawater ; Symbiosis
    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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  • 6
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    Oceans. Legal bedrock for rebuilding America's ocean ecosystems (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-04-11
    Description: The public trust doctrine would provide a powerful framework for restructuring the way we manage U.S. oceans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Turnipseed, Mary -- Crowder, Larry B -- Sagarin, Raphael D -- Roady, Stephen E -- New York, N.Y. -- Science. 2009 Apr 10;324(5924):183-4. doi: 10.1126/science.1170889.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nicholas School of the Environment, Duke University, Durham, NC 27708, USA. mary.turnipseed@duke.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19359567" target="_blank"〉PubMed〈/a〉
    Keywords: *Ecosystem ; *Federal Government ; Jurisprudence ; Legislation as Topic ; Oceans and Seas ; *Public Policy ; United States ; United States Government Agencies
    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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  • 7
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    Efficient atmospheric cleansing of oxidized organic trace gases by vegetation (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-10-23
    Description: The biosphere is the major source and sink of nonmethane volatile organic compounds (VOCs) in the atmosphere. Gas-phase chemical reactions initiate the removal of these compounds from the atmosphere, which ultimately proceeds via deposition at the surface or direct oxidation to carbon monoxide or carbon dioxide. We performed ecosystem-scale flux measurements that show that the removal of oxygenated VOC via dry deposition is substantially larger than is currently assumed for deciduous ecosystems. Laboratory experiments indicate efficient enzymatic conversion and potential up-regulation of various stress-related genes, leading to enhanced uptake rates as a response to ozone and methyl vinyl ketone exposure or mechanical wounding. A revised scheme for the uptake of oxygenated VOCs, incorporated into a global chemistry-transport model, predicts appreciable regional changes in annual dry deposition fluxes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Karl, T -- Harley, P -- Emmons, L -- Thornton, B -- Guenther, A -- Basu, C -- Turnipseed, A -- Jardine, K -- New York, N.Y. -- Science. 2010 Nov 5;330(6005):816-9. doi: 10.1126/science.1192534. Epub 2010 Oct 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Center for Atmospheric Research, Boulder, CO 80301, USA. tomkarl@ucar.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20966216" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/*chemistry ; *Ecosystem ; Gene Expression Regulation, Plant ; Oxidation-Reduction ; Plant Leaves/*metabolism ; Plants/genetics/*metabolism ; Populus/genetics/metabolism ; Stress, Physiological ; Trees/*metabolism ; Tropical Climate ; Up-Regulation ; Volatile Organic Compounds/*analysis/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Do hydrofluorocarbons destroy stratospheric ozone? (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-01-07
    Description: Hydrofluorocarbons, many of which contain a CF(3) group, are one of the major substitutes for the chlorofluorocarbons and halons that are being phased out because they contribute to stratospheric ozone depletion. It is critical to ensure that CF(3) groups do not cause significant ozone depletion. The rate coefficients for the key reactions that determine the efficiency of the CF(3) radical as a catalyst for ozone loss in the stratosphere have been measured and used in a model to calculate the possible depletion of ozone. From these results, it is concluded that the ozone depletion potentials related to the presence of the CF(3) group in hydrofluorocarbons are negligibly small.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ravishankara, A R -- Turnipseed, A A -- Jensen, N R -- Barone, S -- Mills, M -- Howard, C J -- Solomon, S -- New York, N.Y. -- Science. 1994 Jan 7;263(5143):71-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17748353" target="_blank"〉PubMed〈/a〉
    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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  • 9
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    Atmospheric lifetimes of long-lived halogenated species (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-01-08
    Description: The atmospheric lifetimes of the fluorinated gases CF(4), C(2)F(6), c-C(4)F(8), (CF(3))(2)c-C(4)F(6), C(5)F(12), C(6)F(14), C(2)F(5)Cl, C(2)F(4)C(12), CF(3)Cl, and SF(6) are of concern because of the effects that these long-lived compounds acting as greenhouse gases can have on global climate. The possible atmospheric loss processes of these gases were assessed by determining the rate coefficients for the reactions of these gases with O((1)D), H, and OH and the absorption cross sections at 121.6 nanometers in the laboratory and using these data as input to a two-dimensional atmospheric model. The lifetimes of all the studied perfluoro compounds are 〉2000 years, and those of CF(3)Cl, CF(3)CF(2)Cl, and CF(2)ClCF(2)Cl are 〉300 years. If released into the atmosphere, these molecules will accumulate and their effects will persist for centuries or millennia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ravishankara, A R -- Solomon, S -- Turnipseed, A A -- Warren, R F -- New York, N.Y. -- Science. 1993 Jan 8;259(5092):194-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17790983" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Economics. Sustainability and global seafood (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, Martin D -- Roheim, Cathy A -- Crowder, Larry B -- Halpern, Benjamin S -- Turnipseed, Mary -- Anderson, James L -- Asche, Frank -- Bourillon, Luis -- Guttormsen, Atle G -- Khan, Ahmed -- Liguori, Lisa A -- McNevin, Aaron -- O'Connor, Mary I -- Squires, Dale -- Tyedmers, Peter -- Brownstein, Carrie -- Carden, Kristin -- Klinger, Dane H -- Sagarin, Raphael -- Selkoe, Kimberly A -- New York, N.Y. -- Science. 2010 Feb 12;327(5967):784-6. doi: 10.1126/science.1185345.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nicholas School of the Environment, Duke University, Durham, NC 27708, USA. marsmith@duke.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20150469" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Aquaculture/economics/legislation & jurisprudence/organization & administration ; *Commerce/legislation & jurisprudence ; Developed Countries/economics ; Developing Countries/economics ; *Ecosystem ; *Fisheries/economics/legislation & jurisprudence ; *Fishes ; Food Supply ; Government ; Humans ; Malnutrition/epidemiology ; *Seafood/economics ; *Shellfish
    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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