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  • 1
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    Shallow seismic trapping structure in the San Jacinto fault zone near Anza, California (2005)
    In:  Geophys. J. Int., Minsk, Conseil de l'Europe, vol. 162, no. 3, pp. 867-881, pp. B02405, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Fault zone ; Channel waves ; Wave form analysis ; Wave propagation ; Seismology ; California ; USA ; earthquake ; dynamics, ; GJI ; guided ; waves, ; inversion, ; San ; Jacinto ; fault, ; velocity ; model, ; waveform ; analysis
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Aggregation and a strong Allee effect in a cooperative outbreak insect (2016)
    Wiley
    Details
    Publication Date: 2016-07-29
    Description: Most species that are negatively impacted when their densities are low aggregate to minimize this effect. Aggregation has the potential to change how Allee effects are expressed at the population level. We studied the interplay between aggregation and Allee effects in the mountain pine beetle ( Dendroctonus ponderosae Hopkins), an irruptive bark beetle that aggregates to overcome tree defenses. By cooperating to surpass a critical number of attacks per tree, the mountain pine beetle is able to breach host defenses,oviposit and reproduce. Mountain pine beetles and Hymenopteran parasitoids share some biological features, the most notable of which is obligatory host death as a consequence of parasitoid attack and development. We developed spatiotemporal models of mountain pine beetle dynamics that were based on the Nicholson-Bailey framework but which featured beetle aggregation and a tree-level attack threshold. By fitting our models to data from a local mountain pine beetle outbreak, we demonstrate that due to aggregation, attack thresholds at the tree level can be overcome by a surprisingly low ratio of beetles per susceptible tree at the stand level. This results confirms the importance of considering aggregation in models of organisms that are subject to strong Allee effects. This article is protected by copyright. All rights reserved.
    Print ISSN: 1051-0761
    Electronic ISSN: 1939-5582
    Topics: Biology
    Published by Wiley on behalf of The Ecological Society of America (ESA).
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  • 3
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    Bioprinting thick vascularized tissues [Engineering] (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-03-24
    Description: The advancement of tissue and, ultimately, organ engineering requires the ability to pattern human tissues composed of cells, extracellular matrix, and vasculature with controlled microenvironments that can be sustained over prolonged time periods. To date, bioprinting methods have yielded thin tissues that only survive for short durations. To improve their...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Prediction of the arrival of peak nitrate concentrations at the water table at the regional scale in Great Britain (2011)
    Wiley
    Details
    Publication Date: 2011-05-16
    Description: A simple process-based approach to predict regional-scale loading of nitrate at the water table was implemented in a GIS for Great Britain. This links a nitrate input function, unsaturated zone thickness and lithologically-dependent rate of nitrate unsaturated zone travel to estimate arrival time of nitrate at the water table. The nitrate input function is the loading at the base of the soil and has been validated using unsaturated zone pore-water profiles. The unsaturated zone thickness uses groundwater levels based on regional-scale observations infilled by interpolated river base levels. Estimates of the rate of unsaturated zone travel are attributed from regional-scale hydrogeological mapping. The results indicate that peak nitrate loading may have already arrived at the water table for many aquifers, but that it has not where the unsaturated zone is relatively thick There are contrasting outcomes for the two main aquifers which have similar unsaturated zone velocities, the predominantly low relief Permo-Triassic sandstones and the Chalk, which forms significant topographic features. For about 60% of the Chalk, the peak input has not yet reached the water table and will continue to arrive over the next 60 years. The methodology is readily transferable and provides a robust method for estimating peak arrival time for any diffuse conservative pollutant where an input function can be defined at a regional scale and requires only depth to groundwater and a hydrogeological classification. The methodology is extendable in that if additional information is available this can easily be incorporated into the model scheme. Copyright © 2011 John Wiley & Sons, Ltd.
    Print ISSN: 0885-6087
    Electronic ISSN: 1099-1085
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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  • 5
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    Anthropocene: Earth System, geological, philosophical and political paradigm shifts (2015)
    Sage
    Details
    Publication Date: 2015-06-12
    Description: The concept of the Anthropocene has created a profound paradigm shift within the scientific community that may well create equally important changes in philosophy and politics. There is general scientific agreement that human activity has been a geologically recent, yet profound, influence on the Earth System. The magnitude, variety and longevity of human-induced changes, to the lithosphere, hydrosphere, cryosphere, biosphere and atmosphere, suggests that we should refer to the present, not as within the Holocene Epoch (as it is currently formally referred to), but instead as within the Anthropocene Epoch. Hamilton (2015) argues that many commentators fail to acknowledge this paradigm shift and suggests the discussion of when the Anthropocene Epoch started is a distraction and irrelevant. Earth System scientists, such as ourselves, would argue that the evidence for the Anthropocene is already accepted and that the paradigm shift has already occurred. The current discussion has moved forward and is now centred on defining the start of the epoch using the fundamental principles of stratigraphy. We explain how geological time is divided up and the fundamental role of Global Stratotype Section and Points (GSSPs). We go beyond Hamilton’s (2015) limited discussion and argue that the Anthropocene is creating paradigm shifts beyond the natural sciences. We also argue that there are multiple definitions of the Anthropocene and even if a formal definition of the Anthropocene Epoch is agreed by geoscientists, this would in no way invalidate other definitions or uses. It is the utility and wide appeal that makes the Anthropocene such an important concept.
    Print ISSN: 2053-0196
    Electronic ISSN: 2053-020X
    Topics: Geography
    Published by Sage
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  • 6
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    Effects of parasites from salmon farms on productivity of wild salmon [Sustainability Science] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-08-31
    Description: The ecological risks of salmon aquaculture have motivated changes to management and policy designed to protect wild salmon populations and habitats in several countries. In Canada, much attention has focused on outbreaks of parasitic copepods, sea lice (Lepeophtheirus salmonis), on farmed and wild salmon in the Broughton Archipelago, British Columbia. Several recent studies have reached contradictory conclusions on whether the spread of lice from salmon farms affects the productivity of sympatric wild salmon populations. We analyzed recently available sea lice data on farms and spawner–recruit data for pink (Oncorhynchus gorbuscha) and coho (Oncorhynchus kisutch) salmon populations in the Broughton Archipelago and nearby regions where farms are not present. Our results show that sea lice abundance on farms is negatively associated with productivity of both pink and coho salmon in the Broughton Archipelago. These results reconcile the contradictory findings of previous studies and suggest that management and policy measures designed to protect wild salmon from sea lice should yield conservation and fishery benefits.
    Keywords: Sustainability Science
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Techview: biochemistry. Biomolecule mass spectrometry (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McLafferty, F W -- Fridriksson, E K -- Horn, D M -- Lewis, M A -- Zubarev, R A -- New York, N.Y. -- Science. 1999 May 21;284(5418):1289-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10383309" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; DNA/*chemistry/isolation & purification/metabolism ; Mass Spectrometry/instrumentation/*methods ; Molecular Sequence Data ; Molecular Weight ; Proteins/*chemistry/isolation & purification/metabolism ; Sequence Analysis ; Sequence Analysis, DNA ; Thermodynamics ; Ubiquitins/chemistry
    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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  • 8
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    Cavity-mediated collective spin-exchange interactions in a strontium superradiant laser (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-07-20
    Description: Laser-cooled and quantum degenerate atoms are being pursued as quantum simulators and form the basis of today’s most precise sensors. A key challenge toward these goals is to understand and control coherent interactions between the atoms. We observe long-range exchange interactions mediated by an optical cavity, which manifest as tunable spin-spin interactions on the pseudo spin-1/2 system composed of the millihertz linewidth clock transition in strontium. This leads to one-axis twisting dynamics, the emergence of a many-body energy gap, and gap protection of the optical coherence against certain sources of decoherence. Our observations will aid in the future design of versatile quantum simulators and the next generation of atomic clocks that use quantum correlations for enhanced metrology.
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , 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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    Declining wild salmon populations in relation to parasites from farm salmon (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-12-15
    Description: Rather than benefiting wild fish, industrial aquaculture may contribute to declines in ocean fisheries and ecosystems. Farm salmon are commonly infected with salmon lice (Lepeophtheirus salmonis), which are native ectoparasitic copepods. We show that recurrent louse infestations of wild juvenile pink salmon (Oncorhynchus gorbuscha), all associated with salmon farms, have depressed wild pink salmon populations and placed them on a trajectory toward rapid local extinction. The louse-induced mortality of pink salmon is commonly over 80% and exceeds previous fishing mortality. If outbreaks continue, then local extinction is certain, and a 99% collapse in pink salmon population abundance is expected in four salmon generations. These results suggest that salmon farms can cause parasite outbreaks that erode the capacity of a coastal ecosystem to support wild salmon populations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krkosek, Martin -- Ford, Jennifer S -- Morton, Alexandra -- Lele, Subhash -- Myers, Ransom A -- Lewis, Mark A -- New York, N.Y. -- Science. 2007 Dec 14;318(5857):1772-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Mathematical Biology, Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, AB, Canada. mkrkosek@ualberta.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18079401" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Wild ; British Columbia/epidemiology ; *Copepoda ; Disease Outbreaks/statistics & numerical data/veterinary ; Ectoparasitic Infestations/epidemiology/mortality/*veterinary ; Extinction, Biological ; Fish Diseases/*epidemiology/mortality ; *Fisheries ; Linear Models ; Models, Statistical ; Population Dynamics ; *Salmon/parasitology
    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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  • 10
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    Regulatory networks specifying cortical interneurons from human embryonic stem cells reveal roles for CHD2 in interneuron development [Developmental Biology] (2017)
    National Academy of Sciences
    Details
    Publication Date: 2017-12-27
    Description: Cortical interneurons (cINs) modulate excitatory neuronal activity by providing local inhibition. During fetal development, several cIN subtypes derive from the medial ganglionic eminence (MGE), a transient ventral telencephalic structure. While altered cIN development contributes to neurodevelopmental disorders, the inaccessibility of human fetal brain tissue during development has hampered efforts to...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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