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  • 1
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    Giant vortex clusters in a two-dimensional quantum fluid (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Adding energy to a system through transient stirring usually leads to more disorder. In contrast, point-like vortices in a bounded two-dimensional fluid are predicted to reorder above a certain energy, forming persistent vortex clusters. In this study, we experimentally realize these vortex clusters in a planar superfluid: a 〈sup〉87〈/sup〉Rb Bose-Einstein condensate confined to an elliptical geometry. We demonstrate that the clusters persist for long time periods, maintaining the superfluid system in a high-energy state far from global equilibrium. Our experiments explore a regime of vortex matter at negative absolute temperatures and have relevance for the dynamics of topological defects, two-dimensional turbulence, and systems such as helium films, nonlinear optical materials, fermion superfluids, and quark-gluon plasmas.〈/p〉
    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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    Interseismic strain accumulation across the Manyi fault (Tibet) prior to the 1997 Mw 7.6 earthquake (2011)
    Wiley
    Details
    Publication Date: 2011-12-16
    Description: The coseismic displacements caused by the Mw 7.6, 1997 Manyi strike-slip earthquake have been extensively studied. In order to assess whether the current deformation around the Manyi fault is due to one or more postseismic mechanisms and to constrain the rate-state models of afterslip, an estimate of the interseismic motion across the fault prior to the earthquake is needed. We use ESA ERS data to form 20 interferograms covering the five year period of 1992–1997, which are combined using a multi-interferogram method to calculate a map of line-of-sight velocities. Inverting this velocity map using a Monte Carlo method, we estimate relative motion across the fault of 3 ± 2 mm/yr prior to the 1997 earthquake, one third the rate of other major faults in the area such as the Kunlun and the Altyn Tagh faults. The locking depth is poorly resolved, but is estimated to be 22 ± 15 km. The localised pattern of deformation observed suggest that the viscosity of the lower crust and upper mantle in the Manyi area is greater than 4 × 1018 Pa s proposed by previous postseismic studies of the area. We find no evidence of significant deformation across possible westward extensions of the Kunlun Fault. These rates of interseismic deformation are much smaller than the rates still being observed today, 10 years after the event, indicating the current rates must be due to one of the postseismic deformation mechanisms.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Correlated evolution and dietary change in fossil stickleback (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-09-29
    Description: The importance of trophic ecology in adaptation and evolution is well known, yet direct evidence that feeding controls microevolution over extended evolutionary time scales, available only from the fossil record, is conspicuously lacking. Through quantitative analysis of tooth microwear, we show that rapid evolutionary change in Miocene stickleback was associated with shifts in feeding, providing direct evidence from the fossil record for changes in trophic niche and resource exploitation driving directional, microevolutionary change over thousands of years. These results demonstrate the potential for tooth microwear analysis to provide powerful insights into trophic ecology during aquatic adaptive radiations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Purnell, Mark A -- Bell, Michael A -- Baines, David C -- Hart, Paul J B -- Travis, Matthew P -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1887.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, University of Leicester, Leicester LE1 7RH, UK. mark.purnell@leicester.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901325" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Biological Evolution ; *Diet ; Ecosystem ; *Fossils ; Paleodontology ; Phenotype ; *Smegmamorpha/anatomy & histology ; Tooth/*ultrastructure ; Tooth Attrition
    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
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    Adaptive evolution of pelvic reduction in sticklebacks by recurrent deletion of a Pitx1 enhancer (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-12-17
    Description: The molecular mechanisms underlying major phenotypic changes that have evolved repeatedly in nature are generally unknown. Pelvic loss in different natural populations of threespine stickleback fish has occurred through regulatory mutations deleting a tissue-specific enhancer of the Pituitary homeobox transcription factor 1 (Pitx1) gene. The high prevalence of deletion mutations at Pitx1 may be influenced by inherent structural features of the locus. Although Pitx1 null mutations are lethal in laboratory animals, Pitx1 regulatory mutations show molecular signatures of positive selection in pelvic-reduced populations. These studies illustrate how major expression and morphological changes can arise from single mutational leaps in natural populations, producing new adaptive alleles via recurrent regulatory alterations in a key developmental control gene.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109066/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109066/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chan, Yingguang Frank -- Marks, Melissa E -- Jones, Felicity C -- Villarreal, Guadalupe Jr -- Shapiro, Michael D -- Brady, Shannon D -- Southwick, Audrey M -- Absher, Devin M -- Grimwood, Jane -- Schmutz, Jeremy -- Myers, Richard M -- Petrov, Dmitri -- Jonsson, Bjarni -- Schluter, Dolph -- Bell, Michael A -- Kingsley, David M -- P50 HG002568/HG/NHGRI NIH HHS/ -- P50 HG002568-09/HG/NHGRI NIH HHS/ -- P50 HG02568/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2010 Jan 15;327(5963):302-5. doi: 10.1126/science.1182213. Epub 2009 Dec 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology and Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20007865" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; *Biological Evolution ; Chromosome Fragile Sites ; Chromosome Mapping ; Crosses, Genetic ; DNA, Intergenic ; *Enhancer Elements, Genetic ; Fish Proteins/*genetics ; Molecular Sequence Data ; Mutation ; Paired Box Transcription Factors/*genetics ; Pelvis/anatomy & histology ; Selection, Genetic ; *Sequence Deletion ; Smegmamorpha/*anatomy & histology/*genetics/growth & development
    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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  • 5
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    U.S. Climate Reference Network Soil Moisture Observations with Triple Redundancy: Measurement Variability (2013)
    Soil Science Society of America (SSSA)
    Details
    Publication Date: 2013-05-18
    Description: Between 2009 and 2011, the U.S. Climate Reference Network (USCRN) was augmented with soil moisture/soil temperature probes and atmospheric relative humidity instruments as part of a programmatic expansion in support of the National Integrated Drought Information System (NIDIS). The 114 sites in this sparse network are well distributed across the conterminous United States in open, rural locations expected to remain unchanged in land use for many decades into the future. Soil probes are installed in triplicate redundancy, similar to the air temperature and precipitation measurements, at either five standard World Meteorological Organization (WMO) depths (5, 10, 20, 50, and 100 cm) or only two depths (5 and 10 cm) depending on the nature of the underlying materials. Stations also measure air temperature, surface skin temperature, precipitation, solar radiation, and 1.5-m wind speed. In addition to sensor failure, the triplicate design of USCRN soil probes have allowed for an initial characterization of variability of soil moisture measurements. Nationwide analysis of soil moisture during early-to-mid growing season in 2011 and 2012 was performed to examine the differences in response to the widespread drought of 2012. The redundancy of the network helps retain the continuity of the record over time, and also provides key insights into the variations of measurements at a single location that are related to a combination of installation effects and the impacts of soil differences at the local level. This article highlights the usefulness of deploying triplicate configurations of soil probes for detecting faulty sensors and for better understanding the nature of soil moisture measurement variability.
    Electronic ISSN: 1539-1663
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Soil Science Society of America (SSSA)
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  • 6
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    Adaptation in sticklebacks: a functional biology of sticklebacks (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-05-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, M A -- New York, N.Y. -- Science. 1985 May 3;228(4699):574.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17736080" 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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  • 7
    Electronic Resource
    Electronic Resource
    Phenotypic integration of life history and morphology: an example from three-spined stickleback, Gasterosteus aculeatus L. (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 41 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Although typically life history and morphology are studied separately, they may evolve most often in concert. Therefore, a full understanding of the evolution of fish life-history patterns may require exploration of the evolutionary interplay between components of life history and other aspects of phenotype. One of the most promising approaches to understanding phenotypic integration is population comparison. This approach is particularly effective when ancestralderived relationships are understood and when multiple populations can be inferred to have evolved derived character states independently. Here we provide an example of this approach using five allopatric populations of freshwater three-spined stickleback (Gasterosteus aculcatus L.) that have diverged in response to differences in selection regimes among the lakes they inhabit. We demonstrate a relationship between one aspect of reproductive life history, clutch volume and relative body shape. The differences are consistent with those predicted on the basis of differences in trophic habit and overall body form. Finally, we discuss the value of particular groups of fish for use in comparative studies and explore the kinds of evolutionary issues that can be addressed through population comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb03865.x
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  • 8
    Electronic Resource
    Electronic Resource
    Computer modeling of negative ion beam formation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6210-6226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sources of root-mean-square (RMS) emittance growth are described for negative ion extractors in both volume and surface negative ion sources and plasma low-energy beam transport systems. For surface negative ion sources of the Lawrence Berkeley Laboratory or Los Alamos National Laboratory [on Los Alamos Meson Particle Facility (LAMPF)], attention is paid to the nonlinear transverse emittance growth mechanism of the beam/warm plasma interaction. In some cases this is a large effect. In addition, non-normal sheath fields at a convertor are examined as a source of emittance growth. For volume sources, attention is paid to aberration production due to field penetration from the extractor, RMS emittance growth enhancement by a negatively biased plasma extraction electrode, and emittance growth caused by transverse extraction across a magnetic field. For both volume and surface sources, RMS emittance growth due to nonlinear aberration at the plasma extraction electrode is analyzed. Time-dependent contributions to emittance growth are also examined. Nonlinear saturation of ion acoustic waves caused by ion extraction from a warm plasma and beam transversal through a plasma are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342078
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  • 9
    Electronic Resource
    Electronic Resource
    Observations on the size, dry weight and energy content of the eggs of some demersal fish species from British marine waters (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 31 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The diameters, dry weights and calorific value of the eggs of seven gadoid species (cod, Gadus morhua, haddock, Melanogrammus aeglefinus, whiting, Merlangius merlangus, Norway pout, Trisopterus esmarkii, lythe. Pollachius pollachius, saithe, P. virens, ling. Molva molva) and one pleuronectid (plaice, Pleuronectes platessa) were measured. Ling eggs contain an oil globule; the eggs of the other species do not.Preservation in formaldehyde solution caused a small (〈4%) reduction in egg diameter but a large (15–30%) reduction in dry weight. There was no significant difference between the dry weights of unpreserved eggs weighed after (a) oven-drying at 60° C or (b) freeze-drying. Equations relating the dry weight of unpreserved eggs to unpreserved diameter and to preserved diameter are given for six species, and general equations that may apply to all North Sea gadoids whose eggs lack an oil globule are calculated. The calorific values of the dried, unpreserved eggs of all species except ling were similar (mean 23.19 kJ g−1, S.D. 1.50) but the value for ling was higher (mean 26.92 kJ g−1, S.D. 2.29). The estimated energy content (kJ 1000 eggs−1) of eggs of each species are tabulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05209.x
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  • 10
    Electronic Resource
    Electronic Resource
    Assessing risk associated with N fertilizer recommendations in the absence of soil tests (1994)
    Springer
    Nutrient cycling in agroecosystems 40 (1994), S. 175-183 
    Details
    ISSN: 1573-0867
    Keywords: Nitrogen response ; on-farm research ; risk ; probability ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In many developing countries, fertilizer recommendations must be made in the absence of plant and soil analyses. When the region is variable in terms of soils, weather, and magnitude of response to fertilizer, a recommendation is likely to involve a high degree of risk for the farmer. Quantification of such risk is key to developing appropriate recommendations for the farmer. However, most methodologies generally used in analyzing fertilizer trials do not allow adequate quantification, especially as a continuous function, of the risk associated with a given recommendation. Three years of on-farm trials conducted in the High Valley of Mexico were used to evaluate different methodologies for generating N fertilization recommendations and their associated risk for wheat (Triticum aestivum) production in the absence of soil tests. When the traditional approach, using average yield responses or separate trial results, was used, an economic optimum was identified, but it was not possible to quantify the associated risk. In contrast, however, by using a combination of response surface methodology and simple probability analysis, the risk associated with any given recommendation was developed, even under the highly variable conditions of the study zone. The approach uses a treatment difference matrix (developed using average yield differences between a treatment and the zero N (0N) check) and its associated standard deviation over locations. From the matrix, an equation (being a function of N rate and relative grain:N price ratios) was developed that shows the probability of outperforming the 0N check for the economic optimum rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750463
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