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  • American Geophysical Union  (5,143)
  • American Association for the Advancement of Science (AAAS)
  • Annual Reviews
  • 2005-2009  (8,674)
  • 1985-1989
  • 1980-1984
  • 1955-1959
  • 2005  (8,674)
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  • 2005-2009  (8,674)
  • 1985-1989
  • 1980-1984
  • 1955-1959
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  • 1
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    Source parameters of the 11 June 1909, Lambesc (Provence, southeastern France) earthquake: a reappraisal based on macroseismic, seismological and geodetic observations (2005)
    American Geophysical Union
    Details
    Publication Date: 2021-01-05
    Description: Destructive earthquakes are rare in France yet pose a sizable seismic hazard, especially when critical infrastructures are concerned. Only a few destructive events have occurred within the instrumental period, the most important being the 11 June 1909, Lambesc (Provence) earthquake. With a magnitude estimated at 6.2 [Rothé, 1942], the event was recorded by 30 observatories and produced intensity IX effects in the epicentral area, ~30 km north of Marseille. We collected 30 seismograms, leveling data and earthquake intensities to assess the magnitude and possibly the focal mechanism of this event. Following this multidisciplinary approach, we propose a source model where all relevant parameters are constrained by at least two of the input datasets. Our reappraisal of the seismological data yielded Mw 5.8-6.1 (6.0 preferred) and Ms 6.0, consistent with the magnitude from intensity data (Me 5.8) and with constraints derived from modeling of coseismic elevation changes. Hence, we found the Lambesc earthquake to have been somewhat smaller than previously reported. Our datasets also constrain the geometry and kinematics of faulting, suggesting that the earthquake was generated by reverse-right lateral slip on a WNW-striking, steeply north-dipping fault beneath the western part of the Trévaresse fold. This result suggests that the fold, located in front of the Lubéron thrust, plays a significant role in the region’s recent tectonic evolution. The sense of slip obtained for the 1909 rupture also agrees with the regional stress field obtained from earthquake focal mechanisms and microtectonic data as well as recent GPS data.
    Description: Published
    Description: 2454
    Description: partially_open
    Keywords: Lambesc earthquake ; France ; historical seismograms ; displacement modeling ; macroseismic data ; geodetic data ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Self-potential signals associated with preferential ground water flow pathways in a buried paleo-channel (2005)
    American Geophysical Union
    Details
    Publication Date: 2021-04-07
    Description: The flow of ground water in a buried permeable paleochannel can be observed at the ground surface through its self-potential signature. We apply this method to delineate the Saint-Ferréol paleo-channel of the Rhone River located in Camargue, in the South East of France. Negative potentials, 30 mV (reference taken outside the paleochannel),are associated with ground water flow in this major sand-filled channel (500 m wide). Electrical resistivity is primarily controls by the salinity of the pore water. Electrical resistivity tomography and in situ sampling show the salinity of the water inside the paleo-channel is ten times smaller by comparison with the pore water of the surrounding sediments. Combining electrical resistivity surveys, self-potential data, and a minimum of drilling information, a 3-D reconstruction of the architecture of the paleo-channel is obtained showing the usefulness of this methodology for geomorphological reconstructions in this type of coastal environment.
    Description: - Observatoire de Recherche en Environnement (ORE)
    Description: Published
    Description: L07401
    Description: partially_open
    Keywords: Self-potential ; electrical resistivity tomography ; hydrogeology ; tomography ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics ; 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy ; 05. General::05.02. Data dissemination::05.02.04. Hydrogeological data
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  • 3
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    Magmatic gas leakage at Mount Etna (Sicily, Italy): relationships with the volcano-tectonic structures, the hydrological pattern and the eruptive activity (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: In this paper we provide a review of chemical and isotopic data gathered over the last three decades on Etna volcano's fluid emissions and we present a synthetic framework of their spatial and temporal relationships with the volcano-tectonic structures, groundwater circulation and eruptive activity. We show that the chemistry, intensity and spatial distribution of gas exhalations are strongly controlled by the main volcano-tectonic fault systems. The emission of mantle-derived magmatic volatiles, supplied by deep to shallow degassing of alkali-hawaiitic basalts, persistently occurs through the central conduits, producing a huge volcanic plume. The magmatic derivation of the hot gases is verified by their He, C and S isotopic ratios. Colder but widespread emanations of magma-derived CO2 and He also occur through the flanks of the volcano and through aquifers, mainly concentrated within two sectors of the south-southwest (Paternò-Belpasso) and eastern (Zafferana) flanks. In these two peripheral areas, characterized by intense local seismicity and gravity highs, magma-derived CO2 and helium are variably diluted by shallower crustal-derived fluids (organically-derived carbon, radiogenic helium). Thermal and geochemical anomalies recorded in groundwaters and soil gases within these two areas prior to the 1991-1993 eruption are consistent with an input of hot fluids released by ascending magma. Magmatic fluids interacted with the shallow aquifers, modifying their physico-chemical conditions, and led to strong variations of the soil CO2 flux. In addition to routine survey of the crater plume emissions, geochemical monitoring of remote soil gases and groundwaters may thus contribute to forecasting Etna's eruptions.
    Description: Published
    Description: 129-145
    Description: partially_open
    Keywords: Mt. Etna ; Geochemical surveillance ; Groundwaters ; Volcanic gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 4
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    Lateral slab deformation and the origin of the western Mediterranean arcs (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The western Mediterranean subduction zone (WMSZ) extends from the northern Apennine to southern Spain and turns around forming the narrow and tight Calabrian and Gibraltar Arcs. The evolution of the WMSZ is characterized by a first phase of orogenic wedging followed, from 30 Ma on, by trench retreat and back-arc extension. Combining new and previous geological data, new tomographic images of the western Mediterranean mantle, and plate kinematics, we describe the evolution of the WMSZ during the last 35 Myr. Our reconstruction shows that the two arcs form by fragmentation of the 1500 km long WMSZ in small, narrow slabs. Once formed, these two narrow slabs retreat outward, producing back-arc extension and large scale rotation of the flanks, shaping the arcs. The Gibraltar Arc first formed during the middle Miocene, while the Calabrian Arc formed later, during the late Miocene-Pliocene. Despite the different paleogeographic settings, the mechanism of rupture and backward migration of the narrow slabs presents similarities on both sides of the western Mediterranean, suggesting that the slab deformation is also driven by lateral mantle flow that is particularly efficient in a restricted (upper mantle) style of mantle convection.
    Description: Published
    Description: 1-21
    Description: reserved
    Keywords: Mediterranean ; subduction ; arcuate belt ; tomography ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 5
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    S, Cl and F degassing as an indicator of volcanic dynamics: The 2001 eruption of Mount Etna (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The recent eruption of Mount Etna (July 2001) offered the opportunity to analyze magma-derived volatiles emitted during preand syn-eruptive phases, and to verify whether their composition is affected by changes in volcanic dynamics. This paper presents the results of analyses of F, Cl and S in the volcanic plume collected by filter-packs, and interprets variations in the composition based on contrasting solubility in magmas. A Rayleigh-type degassing mechanism was used to fit the acquired data and to estimate Henryâ s solubility constant ratios in Etnean basalt. This model provided insights into the dynamics of the volcano. Abundances of sulfur and halogens in eruptive plumes may help predict the temporal evolution of an ongoing effusive eruption.
    Description: -Gruppo Nazionale per la Vulcanologia.
    Description: Published
    Description: 1559
    Description: partially_open
    Keywords: magmatic degassing ; acidic gases ; plume chemistry ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
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    Environmental magnetic record of paleoclimate change from the Eocene-Oligocene stratotype section, Massignano, Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: A high-resolution environmental magnetic study of the Massignano section, Italy (Global Stratotype Section and Point for the Eocene-Oligocene boundary), has been performed to test whether a clear magnetic signature associated with climatic change is recognizable in this record. Our results reveal the existence of alternating intervals with high and low magnetic mineral concentrations similar to the pattern of rock magnetic property variations observed from an environmental magnetic study of the CIROS-1 sediment core from Antarctica. These results suggest that an external forcing mechanism drove the sedimentary response to global climate change prior to the major Oi-1 cooling event at the Eocene-Oligocene boundary.
    Description: Published
    Description: 601-605
    Description: reserved
    Keywords: Environmental magnetism ; Massignano ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    Methane emission from the mud volcanoes of Sicily (Italy) (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Mud volcanoes represent the largest expression of natural methane release into the atmosphere; however, the gas flux has never been investigated in detail. Methane output from vents and diffuse soil degassing is herewith reported for the first time. Measurements were carried out at 5 mud volcano fields around Sicily (Italy). Each mud volcano is characterized by tens of vents and bubbling pools. In the quiescent phase, methane emission from single vents ranges between 0.01 and 6.8 kg/day. Diffuse soil leakage around the vents is in the order of 102–104 mg m 2 d 1. An exceptional flux of 106 mg m 2 d 1 was recorded close to an everlasting fire. Soil CH4 flux is positive even at large distances from the mud volcano fields suggesting a diffuse microseepage over wider areas. A total of at least 400 tons CH4 per year can be estimated over the area investigated alone ( 1.5 km2).
    Description: Published
    Description: 1215
    Description: partially_open
    Keywords: methane ; flux measurements ; Sicily ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate ; 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Intercomparison of volcanic gas monitoring methodologies performed on Vulcano Island, Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Volcanic gas emissions from fumaroles on the rim of La Fossa crater, Vulcano Island, Italy, were measured simultaneously using direct sampling (for H2O, CO2, total sulfur, HCl and HF), filter packs (for SO2, HCl, HF) and short-path active-mode FTIR measurements (for H2O, CO2,SO2, HCl and HF) in an intercomparison study in May 2002. The results show that Cl/F ratios were in good agreement between all three methods, and that FTIR and direct sampling determined comparable proportions of CO2 and H2O. Amounts of total S observed in direct sampling data were approximately double the amounts of SO2 measured with filter packs and FTIR. This difference could be attributed either to the fact FTIR and filter packs do not measure reduced sulfur species (e.g., H2S) or to sublimation of elemental S upon exit from the fumarole, after collection by direct sampling but before detection with FTIR and filter packs.
    Description: Published
    Description: L02610
    Description: partially_open
    Keywords: volcanic gas techniques ; gas geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
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  • 9
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    Molecular and isotopic composition of free hydrocarbon gases from Sicily, Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Chemical and isotopic data have been used as geochemical tracers for a genetic characterization of hydrocarbon gases from a total of eleven manifestations located in Eastern and Central-Southern Sicily (Italy). The molecular analysis shows that almost all the samples are enriched in methane (up to 93.2% Vol.), with the exception of four gas samples collected around Mt. Etna showing high mantle-derived CO2 content. Methane isotope signatures suggest that these are thermogenic gases or a mixture between thermogenic gases and microbial gases. Although samples from some mud volcanoes in Southern Sicily (Macalube di Aragona) show isotope signatures consistent with a mixing model between thermogenic and microbial, by combining the molecular compositions (C1/(C2 + C3))and the methane isotope ratios (d13C1), such a process seems to be excluded. Therefore, the occurrence of secondary post-genetic processes should be invoked. Two main hypotheses have been considered: the first hypothesis includes that the gas is produced by microbial activity and altered post-genetically by microbial oxidation of methane, while according to the second hypothesis thermogenic gas have modified their molecular ratios due to vertical migration.
    Description: Published
    Description: L06607
    Description: partially_open
    Keywords: Isotopic composition/chemistry ; Organic geochemistry ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    On the slip-weakening behavior of rate- and state-dependent constitutive laws (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We study the dynamic traction behavior within the cohesive zone during the propagation of earthquake ruptures adopting rate and state dependent constitutive relations. The resulting slip weakening curve displays an equivalent slip weakening distance (D0_eq), which is different from the parameter L controlling the state variable evolution. The adopted constitutive parameters (a, b, L) control the slip weakening behavior and the absorbed fracture energy. The dimension of the nucleation patch scales with L and not with D0_eq. We propose a scaling relation between these two lengthscale parameters which prescribes that D0_eq/L ~ 15.
    Description: Published
    Description: 1-4
    Description: open
    Keywords: Earthquake dynamics and mechanics ; Earthquake parameters ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 11
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    Emission of bromine and iodine from Mount Etna volcano (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Constraining fluxes of volcanic bromine and iodine to the atmosphere is important given the significant role these species play in ozone depletion. However, very few such measurements have been made hitherto, such that global volcanic fluxes are poorly constrained. Here we extend the data set of volcanic Br and I degassing by reporting the first measurements of bromine and iodine emissions from Mount Etna. These data were obtained using filter packs and contemporaneous ultraviolet spectroscopic SO2 flux measurements, resulting in time-averaged emission rates of 0.7 kt yr 1 and 0.01 kt yr 1 for Br and I, respectively, from April to October 2004, from which we estimate global Br and I fluxes of order 13 (range, 3â 40) and 0.11 (range, 0.04â 6.6) kt yr 1. Observed changes in plume composition highlight the coherent geochemical behavior of HCl, HF, HBr, and HI during magmatic degassing, and strong fractionation of these species with respect to SO2.
    Description: Published
    Description: Q08008
    Description: partially_open
    Keywords: bromine and iodine in volcanic gases ; halogen atmospheric chemistry ; volcanic degassing ; volcanic plumes ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 12
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    A PTFE membrane for the in situ extraction of dissolved gases in natural waters: Theory and applications (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: A new method for extracting dissolved gases in natural waters has been developed and tested, both in the laboratory and in the field. The sampling device consists of a polytetrafluroethylene (PTFE) tube (waterproof and gas permeable) sealed at one end and connected to a glass sample holder at the other end. The device is pre-evacuated and subsequently dipped in water, where the dissolved gases permeate through the PTFE tube until the pressure inside the system reaches equilibrium. A theoretical model describing the time variation in partial gas pressure inside a sampling device has been elaborated, combining the mass balance and ‘‘Solution-Diffusion Model’’ which describes the gas permeation process through a PTFE membrane). This theoretical model was used to predict the temporal evolution of the partial pressure of each gas species in the sampling device. The model was validated by numerous laboratory tests. The method was applied to the groundwater of Vulcano Island (southern Italy). The results suggest that the new sampling device could easily extract the dissolved gases from water in order to determine their chemical and isotopic composition.
    Description: - European Social Fund.
    Description: Published
    Description: Q09005
    Description: partially_open
    Keywords: dissolved gases ; helium isotope ; PTFE membrane ; Vulcano Island ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques ; 04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
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  • 13
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    Accurate measurement of volcanic SO2 flux: Determination of plume transport speed and integrated SO2 concentration with a single device (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Ground-based measurements of volcanic sulfur dioxide fluxes are important indicators of volcanic activity, with application in hazard assessment, and understanding the impacts of volcanic emissions upon the environment and climate. These data are obtained by making traverses underneath the volcanic plume a few kilometers from source with an ultraviolet spectrometer, measuring integrated SO2 concentrations across the plume’s cross section, and multiplying by the plume’s transport speed. However, plume velocities are usually derived from ground-based anemometers, located many kilometers from the traverse route and hundreds of meters below plume altitude, complicating the experimental design and introducing large flux (can be 〉100%) errors. Here we present the first report of a single instrument capable of (accurate) volcanic SO2 flux measurements. This device records integrated SO2 concentrations and plume heights during traverses. Between traverses, two in-plume SO2 time series are measured from underneath the plume with the instrument, corresponding to zenith and inclined (user-specified angle from vertical in the direction of the volcano) fields of view, respectively. The distance between the points of intersection of the two views with the plume is found on the basis of the determined plume height, and the two signals are cross-correlated to determine the lag between them, enabling accurate derivation of the wind speed. We present flux data (with errors ±12%) obtained in this way at Mt. Etna during July 2004.
    Description: Published
    Description: Q02003
    Description: partially_open
    Keywords: DOAS ; volcanic SO2 emissions. ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
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  • 14
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    Probability map of the next M 〉=5.5 earthquakes in Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The main goal of this work is to provide a probability map for the next moderate to large earthquakes (M 〉= 5.5) in Italy. For this purpose we apply a new nonparametric multivariate model to characterize the spatiotemporal distribution of earthquakes. The method is able to account for tectonics/physics parameters that can potentially influence the spatiotemporal variability and tests their relative importance; moreover, it allows straightforward testing of a variety of hypothesis, such as Seismic Gap, Cluster, and Poisson hypothesis. The method has been applied to Italian seismicity of the last four centuries for earthquakes with M 〉= 5.5. Italy has been divided into 61 irregular zones representing areas with homogeneous tectonic regime resulting from active stress data. Besides the magnitude and the time of the earthquakes, the model includes information on the tectonic stress regime, the homogeneity of its orientation, the number of active faults, the dimension of the area and the homogeneity of the topography. The time distribution of the M 〉= 5.5 earthquakes appears clustered in time for a few years after an event, and then the distribution becomes similar to a memoryless Poisson process, leading to a time-dependent probability map. This map shows that the most likely regions where the next moderate to large earthquakes may occur are Friuli, Umbria- Marche, and part of Southern Apennines and the Calabrian arc.
    Description: Published
    Description: 1-15
    Description: reserved
    Keywords: earthquake probability ; Italy ; seismotectonic regionalization ; statistical modeling ; 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 15
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    Slow rupture of an aseismic fault in a seismogenic region of Central Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2012-02-03
    Description: Slow earthquakes and afterslips prove that the Earth does not have just two response time scales, i.e. that of tectonic loading and that of regular earthquakes. A swarm of slow earthquakes, with time constants of the order of hundreds of seconds, has been detected by a laser interferometer below the Gran Sasso massif (Italy). We analyse and model these observations to identify a very plausible source in a local fault, with no historic seismic behavior. While slow earthquakes occurring in subduction zones, and at the transition between locked and stably sliding segments of the San Andreas fault, are often associated with seismic events, in the case of the Apennines there is no correlation between local seismicity and slow earthquakes. Slow earthquakes, therefore, may also represent a specific failure behavior for a seismically locked fault, adding further complexity to the interpretation of geologic data for seismic hazard estimates.
    Description: Published
    Description: 2219
    Description: open
    Keywords: Earthquake dynamics and mechanics ; Seismic hazard assessment and prediction ; Seismicity and seismotectonics ; 04. Solid Earth::04.01. Earth Interior::04.01.05. Rheology ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
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  • 16
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    Volcanic plume monitoring at Mount Etna by diffusive (passive) sampling (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: This paper reports the use of diffusive tubes in determining HF, HCl, and SO2 in the volcanic plume of Mount Etna in an attempt to highlight the potential of this method in studying volcanoes. In a first application a network of 18 diffusive tubes was installed on Etna flanks, aimed at evaluating the atmospheric dispersion of the volcanic plume on a local scale. Results showed a monotonic decrease in volatile air concentrations with distance from the craters (HF from 0.15 to 〈0.003 mmol m3, HCl from 2 to 〈0.01 mmol m3, and SO2 from 11 to 0.04 mmol m3), revealing the prevalently volcanic contribution. Matching of SO2/HCl and HCl/HF volatile ratios with contemporaneous measurements at the summit craters validated the use of diffusive tubes in tracing the chemical features of a volcanic plume from remote locations. A first tentative assessment of dry deposition rates of volcanogenic acidic gases was also made, yielding 2.5 74 t d1 (SO2), 0.6 17 t d1 (HCl), and 0.02 0.6 t d1 (HF) and revealing the potential environmental impact of gas emissions. In a second experiment, carried out during the recent October 2002 to February 2003 eruption of Etna, diffusive tubes provided a continuous record of the chemical composition of the eruptive plume from a safe distance of 1 km from the vents, thus considerably decreasing the risks involved in sampling. This highlighted a clear time decrease in SO2 concentrations and SO2/HCl ratios, which was interpreted as due to progressive exhaustion of volatile degassing and eruption energy.
    Description: Published
    Description: D21308
    Description: partially_open
    Keywords: volcanic plumes ; impact of volcanic emissions ; sulfur and halogens chemistry ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
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  • 17
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    Volcanic gas emissions from the summit craters and flanks of Mt. Etna, 1987-2000 (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: In the last 13 years gas emissions from both the summit and the flanks of Mount Etna volcano have been monitored using remote sensing techniques (COSPEC, and FTIR since 2000) and on-site monitoring devices. The SO2 flux variations (600 to 25,000 Mg/day) indicated: (i) low values coinciding with deep seismicity prior to eruptions or/and preceding increases in summit volcanic activity; (ii) increasing trends tracking the ascent of fresh magma within the shallow feeding system and whose rate seems proportional to the speed of magma rise; (iii) decreasing trends related to progressive degassing of magma batches; (iv) an imbalance between the amount of magma erupted and that which contributed the SO2 emission (~ 13 % of the degassing magma having been erupted during the studied period), implying that magma degassing is dominantly intrusive; (v) a seasonal component, probably due to variations in solar zenith angle, meteorological parameters and, possibly, tidal forces.FTIR monitoring allowed to recognize significant variations of SO2/HCl and SO2/HF ratios in the volcanic plume which, combined with COSPEC data, provided new insight into the dynamics of ascent and degassing of discrete magma bodies. Strong variations in CO2-rich soil degassing are interpreted as markers of gradual magma ascent from great depth (〉10 km) to the upper (〈5 km) feeding system of Mt. Etna. These changes appear to precede increases in SO2 plume flux at the craters and, so, provide additional constraints upon the interpretation of COSPEC data and the modeling of magma rise at that volcano.
    Description: Published
    Description: 111-128
    Description: partially_open
    Keywords: Gas emissions ; Mt. Etna ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 18
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    Relative roles of rifting tectonics and magma ascent processes: Inferences from geophysical, structural, volcanological, and geochemical data for the Neapolitan volcanic region (southern Italy) (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The Neapolitan volcanic region is located within the graben structure of the Campanian Plain (CP), which developed between the western sector of the Appenine Chain and the eastern margin of the Tyrrhenian Sea. Two volcanic areas, spaced less than 10 km apart, are situated within the CP: the Somma-Vesuvius Volcano (SVV) and the Phlegraean Volcanic District (PVD). SVV is a typical stratovolcano, whereas PVD, including Campi Flegrei, Procida, and Ischia, is composed mostly of monogenetic centers. This contrast is due to different magma supply systems: a widespread fissure-type system beneath the PVD and a central-type magma supply system for the SVV. Volcanological, geophysical, and geochemical data show that magma viscosity, magma supply rate, and depth of magma storage are comparable at PVD and SVV, whereas different structural arrangements characterize the two areas. On the basis of geophysical data and magma geochemistry, an oblique-extensional tectonic regime is proposed within the PVD, whereas in the SVVarea a compressive stress regime dominates over extension. Geophysical data suggest that the area with the maximum deformation rate extends between the EW-running 41st parallel and the NE-running Magnaghi-Sebeto fault systems. The PVD extensional area is a consequence of the Tyrrhenian Sea opening and is decoupled from the surrounding areas (Roccamonfina and Somma-Vesuvius) which are still dominated by Adriatic slab dynamics. Spatially, we argue that the contribution of the asthenospheric wedge become much less important from W-NW to E-SE in the CP. The development of the two styles of volcanism in the CP reflects the different tectonic regimes acting in the area.
    Description: Published
    Description: 1-25
    Description: partially_open
    Keywords: Volcanic styles ; Tectonic setting ; Neapolitan volcanic region ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
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  • 19
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    The 2002–2003 eruption of Stromboli (Italy): Evaluation of the volcanic activity by means of continuous monitoring of soil temperature, CO2 flux, and meteorological parameters (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: From December 2002 to July 2003, Stromboli volcano was characterized by a new effusive stage of eruption after a period of extraordinary strombolian activity. Signals recorded in two continuous monitoring stations during the eruption, which have already been presented in very recent papers, evidenced anomalies in the CO2 flux just before the onset of the eruption. A more detailed analysis carried out on the data subset acquired during the eruption, integrated by daily field observations of the scientific personnel working at the volcanological observatory in Stromboli, showed that CO2 flux and soil temperature are strictly related to volcanic events. Furthermore, the relative minima and maxima of the two parameters showed a strong correlation with wind speed and direction. This fact was especially true at the summit station, whereas at the coastal sites seasonal and meteorological effects masked the volcanic signal. The analysis of the wind data, particularly the relationships between wind speed and direction, air and soil temperature, and local circulation of atmospheric air masses revealed that during the eruption, in the summit area of Stromboli air movements were not only related to atmospheric circulation but were also significantly affected, and in certain cases caused, by volcanic activity. This conclusion was reached by observing several anomalies, such as the discrepancies in the wind direction between the two stations, higher air temperatures at the summit site, and inversion of direction for wind before and after the reopening of the conduit in a major explosion on 5 April 2003. The relationships found between volcanic activity, soil temperatures, CO2 fluxes, and wind speed and direction indicate that soil temperature measurements, in an open conduit volcano such as in this case, could be used to monitor the level of volcanic activity, along with CO2 flux. Furthermore, the possible volcanic origin of a peculiar type of air circulation identified in the summit area of Stromboli suggests that the separation between volcanic and atmospheric signals might not be obvious, requiring monitoring over a wide area, rather than a single location.
    Description: Published
    Description: Q12001
    Description: partially_open
    Keywords: carbon dioxide flux ; continuous monitoring ; soil temperature ; wind ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
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  • 20
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    Geochemical precursors of the activity of an open-conduit volcano: The Stromboli 2002-2003 eruptive events (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Marked increases of CO2, H2 and He dissolved in thermal waters and changes in the dissolved carbon isotopic composition, were observed at Stromboli before the 28 December 2002 eruption and before a violent explosive paroxysm occurred on 5 April 2003. High anomalous CO2 flux values were recorded at the crater rim since a week before the eruption onset. The first anomalies in the thermal waters (dissolved CO2 amount) appeared some months before the eruption, when magma column rose at a very high level in the conduit. High peaks of dissolved H2 and He were recorded a few days before the paroxysm. Carbon isotopic composition indicates a magmatic origin of the dissolved CO2 whose increase, together with those of H2 and He, is attributed to an increasing output of deep gases likely produced by depressurization of a rising batch of a deep gas-rich magma, whose fragments have been emitted during the explosion.
    Description: Italian Civil Protection
    Description: Published
    Description: L07620
    Description: partially_open
    Keywords: Stromboli ; geochemical precursors ; CO2 flux ; pH ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
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  • 21
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    Nitrogen isotopes in thermal fluids of a forearc region (Jalisco Block, Mexico): evidence for heavy nitrogen from continental crust (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The Jalisco Block (JB) is a geologically and tectonically complex part of northwestern Mexico characterized by active subduction-type volcanism, rifting, and old stable structures. Thermal springs and groups of springs are widely distributed over JB. Bubbling gas from seven thermal springs located within different tectonic environments of the JB was analyzed for He, 20Ne, and N2 concentrations and d15N ratios. All gases are N2-dominant (〉84%) with the exception of one sample (Rio´ Purificacio´n), which has a significant CH4 content (about 50%). All collected gas samples are relatively high in He, up to 1500 ppm vol and with 3He/4He values ranging from 0.6 to 4.5 Ra. All measured nitrogen isotope ratios are heavier than air with d15N values ranging from 0.5 to 5.0%. The relative N2 excess with respect to air-saturated water computed on the basis of N2 and 20Ne contents indicates the contribution of a nonatmospheric N2 source. All the samples show a good correlation between d15N and the relative excess of N2 with d15N +5.3% for the maximum N2 excess of 100%. Due to a presumed lack of seafloor sediment involved in the subduction process, such a d15N positive value seems to reflect the addition to the fluids of a heavy nitrogen originating from metamorphism processes of rocks occurring within the overlying continental crust.
    Description: Published
    Description: 1-9
    Description: partially_open
    Keywords: bubbling gases ; forearc region ; Jalisco Block-Mexico ; nitrogen isotopes ; subduction-related volcanism ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data
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  • 22
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    Geochemical evidence of seismogenic-induced anomalies in the dissolved gases of thermal waters: A case study of Umbria (Central Apennines, Italy) both during and after the 1997-1998 seismic swarm (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: In this paper we present the first geochemical data set regarding long-term monitoring of dissolved gases in thermal waters from a seismic area. Three sites in Umbria (Central Apennines, Italy) were studied both for the chemical and for the helium isotopic composition of the dissolved gases. Data were collected during and after the seismic crisis that struck the region in 1997â 1998. The chemical composition of the dissolved gases revealed that a CO2-rich gas phase was always mixed with an atmospheric-derived component dominated by N2. A normal faulting marked the beginning of the seismic activity enhancing the release of CO2 on a regional scale. Variations in both the chemical and isotopic compositions of the dissolved gases were also observed as preseismic, synseismic, and postseismic phenomena related to the seismic shock of March 1998. Those geochemical modifications were interpreted as being the consequence of a drop in the CO2 degassing rate, in good agreement with the compressive focal mechanism of that seismic event. Furthermore, this interpretation was also consistent with the geologic and tectonic setting of the study area and induced us to postulate that changes in the local rock permeability, due to crustal deformations (i.e., coseismic deformation and postseismic release), were responsible for the geochemical modifications observed. On the basis of the foregoing, we have concluded that the geochemistry of dissolved gases in groundwaters represents a useful tool for the investigation of the relationships between circulating fluids and seismic activity.
    Description: Published
    Description: partially_open
    Keywords: dissolved gases ; geochemistry ; seismic areas ; 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 05. General::05.02. Data dissemination::05.02.04. Hydrogeological data
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  • 23
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    Chemical mapping of a fumarolic field: La Fossa Crater, Vulcano Island (Aeolian Islands, Italy) (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The performance of a newly-developed portable gas analyzer, capable of real-time measurement of CO2, SO2 and H2S concentrations in volcanic gases, was tested at La Fossa Crater, Vulcano Island. The gas analyzer was used to acquire about 3000 determinations over the fumarolic field, allowing the definition of its chemical structure and heterogeneity. Our high-resolution analysis reveals that, in December 2004, the La Fossa fumarolic field was characterized by an oxidized inner core (SO2/H2S ratios of 3), and by more reducing conditions on its northern edge (SO2/H2S ratios of 1; range: 0.2–3.3). CO2/(SO2+H2S) molar ratios averaged 35 ± 21, with overlapping compositions for rim and inner crater fumaroles. S-poor compositions (CO2/(SO2+H2S) 50) characterized the field margins, probably due to deposition of native sulfur. Based on the above data and an SO2 flux of 18 ± 3 t.d-1, we estimate CO2 and H2S output rates from the volcano of 420 ± 250 and 4 ± 2 t.d-1, respectively.
    Description: Published
    Description: L13309
    Description: partially_open
    Keywords: electrochemical sensors ; fumarolic gases ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
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  • 24
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    Carbon dioxide Earth degassing and seismogenesis in central and southern Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We present the first regional map of CO2 Earth degassing from a large area (most of central and south Italy) derived from the carbon of deep provenance dissolved in the main springs of the region. The investigation shows that a globally significant amount of deeply derived CO2 (10% of the estimated global CO2 emitted from subaerial volcanoes) is released by two large areas located in western Italy. The anomalous flux of CO2 suddenly disappears in the Apennine in correspondence to a narrow band where most of seismicity concentrates. Here, at depth, the gas accumulates in crustal traps generating CO2 overpressurized reservoirs which induce seismicity.
    Description: Published
    Description: 1-4
    Description: partially_open
    Keywords: Carbon dioxide ; Central Italy ; Southern Italy ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 25
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    Anomalous magmatic degassing prior to the 5th April 2003 paroxysm on Stromboli (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: A major explosion occurred at Stromboli on April 5 2003, being the most powerful event over a period of exceptional eruptive activity lasting from December to July. Here, we describe results from a network of diffusive tubes set up on the Stromboli’s summit area, aimed at a characterisation of plume composition (SO2, HCl, HF) prior to and after April 5. Data analysis revealed anomalous sulphur degassing 2–3 days before the event, when SO2/HCl ratios (9) significantly higher than those typical of quiescent degassing (1) were recorded. We interpret this exceptional plume signature as an evidence of S-rich magmas ascending in the shallow plumbing system, and propose high SO2/HCl as a potential precursor of major explosions on the volcano. The post-April 5 phase was characterised by time-decreasing SO2/HCl and SO2/HF plume ratios, ascribed to declining magma feeding as a prelude to restoration of ‘‘normal’’ Strombolian activity.
    Description: Published
    Description: L14607
    Description: partially_open
    Keywords: magmatic degassing ; paroxysm ; Stromboli ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
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  • 26
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    Evidence of a recent input of magmatic gases into the quiescent volcanic edifice of Panarea, Aeolian Islands, Italy (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: On 2nd/3rd November 2002, a huge amount of gas, mainly composed of CO2, was suddenly released from the sea bottom off the coast of Panarea, producing a ‘‘crater’’20 by 10 meters wide and 7 meters deep. The gas output was estimated to be 109 l/d, two orders of magnitude higher than that measured in the 1980s. The anomalous degassing rate lasted for some weeks, slowly decreasing to an almost constant rate of about 4 x 107 l/d after two months. The geothermo- barometric estimations revealed an increase of both the temperature and pressure in the geothermal system feeding the sampled vents. The 3He/4He ratios were similar to those measured in nearby Stromboli. We have monitored the area for the last two decades, and based on our intensive and extensive geochemical measurements, have ascertained that the geothermal reservoir has lost its steady state. We maintain that a new magmatic input caused these phenomena.
    Description: - Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy. - Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Palermo, Italy. - Dipartimento Chimica e Fisica della Terra ed Applicazioni, Palermo, Italy.
    Description: Published
    Description: L07619
    Description: partially_open
    Keywords: Submarine degassing ; magmatic fluids ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
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  • 27
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    Evidence of deep magma degassing and ascent by geochemistry of peripheral gas emissions at Mount Etna (Italy): Assessment of the magmatic reservoir pressure (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Five gas discharges in the area of Mount Etna volcano (Italy) and in the near Hyblean plateau have been monitored since 1996. All the emissions displayed low contributions from crustal fluids, whereas magmatic gases were the main component. Selective dissolution of these gases into hydrothermal aquifers has been recognized and modeled, allowing us to calculate the original composition of the magma-released gases. The inferred composition of the magmatic gases exhibits synchronous variations of He/Ne and He/CO2 ratios, which are coherent with the magma degassing process. On the basis of numerical simulations of volatile degassing from Etnean basalts we have computed the initial and final pressures of the magma batches feeding the emissions. We thus can define the levels of the Etna plumbing system where magmas are stored. Pressure values were around 360 and 160 MPa for initial and final stages, respectively, meaning related depths of about 10 and 3 km below sea level, matching those obtained by geophysical investigations for the deep and shallow magma reservoirs. In addition, we have been able to recognize episodes of magma migration from the deeper reservoir toward the shallow one. An important magma injection into the shallow storage volume was detected during the onset of the 2001 eruption (17 July). No further injection had taken place during this period until September 2001, providing a possible reason for the quick exhaustion of the eruption. In view of this we suggest that the sampled emissions are a powerful geochemical tool to investigate the Etna’s plumbing system and its magma dynamics, as well as the development of eruptive events.
    Description: Published
    Description: 2463
    Description: partially_open
    Keywords: gas geochemistry ; magma degassing ; modeling ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
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  • 28
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    Reply to comment by A. Kopf on ‘‘Methane emission from the mud volcanoes of Sicily (Italy)’’, and notice on CH4 flux data from European mud volcanoes (2005)
    American Geophysical Union
    In:  Etiope G., Caracausi A., Favara R., Italiano F., Baciu C. (2002) Methane emission from the mud volcanoes of Sicily (Italy). Geoph. Res. Letters 29, 14340-14343.
    Details
    Publication Date: 2017-04-04
    Description: The paper ‘‘Methane emission from the mud volcanoes of Sicily (Italy)’’ by Etiope et al. [2002] represents the first report ever done on experimental CH4 output data from subaerial mud volcanoes (MV). A review of available CH4 flux data and detailed discussion about the global implications of mud volcanic CH4 emission has been made elsewhere [Etiope and Klusman, 2002; Morner and Etiope, 2002]. [2] The comment by Kopf [2003] contributes to open discussions and to make the readership aware on how important this subject is. In this reply we wish to clarify that precise data of CH4 flux from geologic sources are beginning to be available only now. It would be opportune that the MV-expert community could agree in using a common unit for the gas flux. We propose t y 1 and Mt y 1, and not metres cubed, consistently with the data reported for the methane sources/sinks budget by the IPCC. [3] Sicilian MVs, the first to be measured in detail, are considerably much smaller than the Azeri Ashgil MV, mentioned by Kopf [2003], and it is therefore obvious to expect a lower gas flux. Anyway the Dashgil mud volcano flux data are not based on exact measurements but only on visual estimates of the bubbles [Hovland et al., 1997]. In order to fully reply to Kopf [2003], hereafter we briefly discuss the problem of how to estimate the total number of MVs in the world and present new data from other European MVs, recently investigated. Finally, we outline the global importance of mud volcanic CH4 emission, as Kopf [2003] and recent literature is stressing.
    Description: Published
    Description: 1094
    Description: partially_open
    Keywords: methane ; mud volcanoes ; helium ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate ; 02. Cryosphere::02.03. Ice cores::02.03.02. Atmospheric Chemistry ; 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
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  • 29
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    Mount Etna: Geochemical signals of magma ascent and unusually extensive plumbing system (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Five years of gas monitoring from selected sites suggest that Mt Etna’s plumbing system is much more extensive than previously reported. It extends at least 40 km SW from the volcano’s boundary along the NE-SW regional fault, where it discharges about 200 tons/day of gas, containing helium with mantle-type isotopic composition. Synchronous variations of 3He/4He isotopic ratios in gas sampled at sites located 60 kilometers apart have allowed us to detect pulses of ascending magma in the plumbing system, thus providing a powerful tool for eruption forecasting. Following summer 2001 eruption, the still increasing trend of the 3He/4He ratios indicates that magma storage is even now occurring at a shallow depth. Hence, the volcano maintains a high capacity to re-erupt within the next few months.
    Description: Published
    Description: 1057
    Description: partially_open
    Keywords: helium isotopes ; geochemical monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
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    Active geodynamics of the central Mediterranean Sea: Tensional tectonic evidences in western Sicily from mantle-derived helium (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We report results on the measured high 3He/4He isotope ratio in western Sicily, interpreted together with the heat data. The study of this sector of the Europe-Africa interaction is crucial to a better understanding of the tectonics and the geodynamical evolution of the central Mediterranean area. The estimated mantle-derived helium fluxes in the investigated areas are up to 2–3 orders of magnitude greater than those of a stable continental area. The highest flux, found in the southernmost area near the Sicily Channel, where recent eruptions of the Ferdinandea Island occurred 20 miles out to sea off Sciacca, has been associated with a clear excess of heat flow. Our results indicate that there is an accumulation of magma below the continental crust of western Sicily that is possibly intruding and out-gassing through roughly N-S trending deep fault systems linked to the mantle, that have an extensional component. Although the identification of these faults is not sufficiently constrained by our data, they could possibly be linked to the pre-existing faults that originated during the Mesozoic extensional-transtensional tectonic phases.
    Description: Published
    Description: L04312
    Description: partially_open
    Keywords: helium isotopes ; heat production ; tectonics ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems ; 03. Hydrosphere::03.04. Chemical and biological::03.04.07. Radioactivity and isotopes ; 04. Solid Earth::04.02. Exploration geophysics::04.02.03. Heat flow ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.07. Tectonophysics::04.07.03. Heat generation and transport ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    The Stromboli Volcano landslides of December 2002: A seismological description (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We analyse seismograms of the slump episodes at Stromboli on December 30, 2002. Using a simple single force model, we estimate the volume involved in the individual subevents and attempt a chronological reconstruction of the whole process. Our results indicate the occurrence of two main events that could be interpreted as a submarine slump, which caused the observed tsunami, and a subaerial slump, which did not produce destructive sea waves. A total volume of about 20 106 m3 results for the submarine event, which developed over about 2 minutes with several distinct detachments, the first and largest displacing a volume of 10.8 106 m3. The second, subaerial, slump involved at least 2.5 106 m3, in about 90 s. A large long period pulse is also recognizable in the seismograms of the Stromboli station. We tentatively interpret this feature as tilt caused by the water load associated with the inundation in the Ficogrande area, on the northeastern side of the island.
    Description: Published
    Description: (L02605)
    Description: reserved
    Keywords: Stromboli Volcano ; seismological description ; Fractures and faults ; Structural Geology ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    The 1997 Umbria-Marche (Italy) earthquake sequence: relationship between ground deformation and seismogenic structure (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: A field survey performed during the 1997 Umbria-Marche earthquake sequence led us to recognize ground and pavement ruptures associated with the three largest shocks (M〉= 5.7). The ruptures are concentrated in narrow bands that, in part, are on and near previously mapped high-angle normal fauts. The geometry of the ground deformation is consistent with the NE-trending extension indicated by CMT focal solutions of the mainshocks. The distribution of aftershocks suggests that the three mainshocks occurred on ~40 degree SW-dipping normal faults. Geological investigations, modelling of expected coseismic elevation changes, and seismic data, suggest that the surface deformation is not the direct result of primary rupture of faults at depth.
    Description: Published
    Description: 895-898
    Description: reserved
    Keywords: Structural geology ; Fractures and faults ; Seismology ; Seismicity and seismotectonics ; Europe ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Geochemistry of serpentinized peridotites from the Mariana Forearc Conical Seamount, ODP Leg 125: Implications for the elemental recycling at subduction zones (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Recent examinations of the chemical fluxes through convergent plate margins suggest the existence of significant mass imbalances for many key species: only 20–30% of the to-the-trench inventory of large-ion lithophile elements (LILE) can be accounted for by the magmatic outputs of volcanic arcs. Active serpentinite mud volcanism in the shallow forearc region of the Mariana convergent margin presents a unique opportunity to study a new outflux: the products of shallow-level exchanges between the upper mantle and slab-derived fluids. ODP Leg 125 recovered serpentinized harzburgites and dunites from three sites on the crests and flanks of the active Conical Seamount. These serpentinites have U-shaped rare earth element (REE) patterns, resembling those of boninites. U, Th, and the high field strength elements (HFSE) are highly depleted and vary in concentration by up to 2 orders of magnitude. The low U contents and positive Eu anomalies indicate that fluids from the subducting Pacific slab were probably reducing in nature. On the basis of substantial enrichments of fluid-mobile elements in serpentinized peridotites, we calculated very large slab inventory depletions of B (79%), Cs (32%), Li (18%), As (17%), and Sb (12%). Such highly enriched serpentinized peridotites dragged down to depths of arc magma generation may represent an unexplored reservoir that could help balance the input-output deficit of these elements as observed by Plank and Langmuir (1993, 1998) and others. Surprisingly, many species thought to be mobile in fluids, such as U, Ba, Rb, and to a lesser extent Sr and Pb, are not enriched in the rocks relative to the depleted mantle peridotites, and we estimate that only 1–2% of these elements leave the subducting slabs at depths of 10 to 40 km. Enrichments of these elements in volcanic front and behind-the-front arc lavas point to changes in slab fluid composition at greater depths.
    Description: Published
    Description: 1-24
    Description: partially_open
    Keywords: Serpentinite ; Ocean Drilling Program ; Forearc ; Mantle ; Marianas ; Subduction ; 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology ; 04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    An improved stress map for Italy and surrounding regions (central Mediterranean) (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We present an updated present-day stress data compilation for the Italian region and discuss it with respect to the geodynamic setting and the seismicity of the area. We collected and analyzed 190 new stress data from borehole breakouts, seismicity, and active faults and checked in detail the previous compilation [Montone et al., 1999]. Our improved data set consists of 542 data, 362 of which with a reliable quality for stress maps. The Italian region is well sampled, allowing the computation of constrained smoothed stress maps; for surrounding regions we added the World Stress Map 2003 release data. These maps depict the active stress conditions and, in the areas where the data are sparse, contribute to understand the relationship between active stress, past tectonic setting, and the seismicity of the study region. The new data are particularly representative along the northern Apennine front, from the Po Plain to offshore the Adriatic, and along the southern Tyrrhenian Sea, north of Sicily, where they point out a compressive tectonic regime. In the Alps both compressive and transcurrent regimes are observed. Our data also confirm that the whole Apenninic belt and the Calabrian arc are extending. Along the central Adriatic coast, changes from one stress regime to another are shown by abrupt variations in the minimum horizontal stress directions. Other gentler stress rotations, as, for instance, from the southern Apennines to the Calabrian arc or along the northern Apennines, follow the curvature of the arcs and are not associated to a stress regime variation.
    Description: Published
    Description: (B10410)
    Description: partially_open
    Keywords: active stress ; earthquakes ; borehole breakouts ; crust and lithosphere ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
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    Reply to comment by Clifford Thurber and Haijiang Zhang on “The effect of velocity structure errors on double-difference “earthquake location (2005)
    American Geophysical Union
    In:  Reply to a comment
    Details
    Publication Date: 2017-04-04
    Description: We defend the two statements of ours in Michelini and Lomax [2004] about Zhang and Thurber [2003] regarded by Thurber and Zhang as incorrect and misleading.
    Description: Published
    Description: partially_open
    Keywords: earthquake location ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Seismic constraints on the present-day kinematics of the Gargano foreland, Italy, at the transition zone between the southern and northern Apennine belts (2005)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The 1995–2004 seismicity in the Gargano Promontory (hereafter GP) foreland at the transition zone between Southern and Northern Apennine belts (Italy) is analyzed with the aim to put constraints on the present-day kinematics of this key-area of the foreland. The spatial distribution of earthquakes and 54 calculated focal mechanisms show that that the main GP ruptures develop along E-W striking, right-lateral strike-slip faults and NW- SE, normal to left-lateral second-order faults that move in response to a prevailing NW-SE compression (i.e. NE-SW extension). Tacking into account the depth of the relocated seismicity and the available geological information, we propose that the GP shear zone represents an E-W striking, major crustal discontinuity separating sectors of the foreland that move in response to the higher, northeastward propagation velocity of the thrust front of the Northern Apennines with respect to that of the Southern Apennines.
    Description: Published
    Description: open
    Keywords: Seismicity ; seismotectonics ; geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
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    Causes of Low Frequency North Atlantic SST Variability in a Coupled GCM (2005)
    American Geophysical Union
    Details
    Publication Date: 2021-05-19
    Description: The low frequency sea surface temperature (SST) variability in the North Atlantic is studied using the Center for Ocean-Land-Atmosphere Studies (COLA) anomaly coupled general circulation model. The main focus is placed on the relative roles of stable and unstable coupled feedbacks in inducing the low frequency SST variability in various regions of the North Atlantic. To examine this question, a recently developed coupling technique, interactive ensembles, is applied to reduce the strength of “weather noise” in the model and isolate the atmospheric feedback to boundary forcing.
    Description: Published
    Keywords: Sea surface temperature
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 38
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    Seasonality and stable isotopes in planktonic foraminifera off Cape Cod, Massachusetts (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA4011, doi:10.1029/2005PA001150.
    Description: Monthly samples of stratified plankton tows taken from the slope waters off Cape Cod nearly 25 years ago are used to describe the seasonal succession of planktonic foraminifera and their oxygen isotope ratios. The 15°C seasonal cycle of sea surface temperature (SST) accounts for a diverse mixture of tropical to subpolar species. Summer samples include various Globigerinoides and Neogloboquadrina dutertrei, whereas winter and early spring species include Globigerina bulloides and Neogloboquadrina pachyderma (dextral). Globorotalia inflata lives all year but at varying water depths. Compared with the fauna in 1960–1961 (described by R. Cifelli), our samples seem warmer. Because sea surface salinity varies little during the year, δ18O is mostly a function of SST. Throughout the year, there are always species present with δ18O close to the calculated isotopic equilibrium of carbonate with surface seawater. This raises the possibility that seasonality can be estimated directly from the range of δ18O in a sediment sample provided that the δ18O-salinity relationship is the same as today.
    Description: Funding was provided by NSF grant OCE-0117149.
    Keywords: Plankton tow ; Foraminifera ; Stable isotopes
    Repository Name: Woods Hole Open Access Server
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    Role of carbon cycle observations and knowledge in carbon management (2005)
    Annual Reviews
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Annual Reviews, 2003. This article is posted here by permission of Annual Reviews for personal use, not for redistribution. The definitive version was published in Annual Review of Environment and Resources 28 (2003): 521-558, doi:10.1146/annurev.energy.28.011503.163443.
    Description: Agriculture and industrial development have led to inadvertent changes in the natural carbon cycle. As a consequence, concentrations of carbon dioxide and other greenhouse gases have increased in the atmosphere and may lead to changes in climate. The current challenge facing society is to develop options for future management of the carbon cycle. A variety of approaches has been suggested: direct reduction of emissions, deliberate manipulation of the natural carbon cycle to enhance sequestration, and capture and isolation of carbon from fossil fuel use. Policy development to date has laid out some of the general principles to which carbon management should adhere. These are summarized as: how much carbon is stored, by what means, and for how long. To successfully manage carbon for climate purposes requires increased understanding of carbon cycle dynamics and improvement in the scientific capabilities available for measurement as well as for policy needs. The specific needs for scientific information to underpin carbon cycle management decisions are not yet broadly known. A stronger dialogue between decision makers and scientists must be developed to foster improved application of scientific knowledge to decisions. This review focuses on the current knowledge of the carbon cycle, carbon measurement capabilities (with an emphasis on the continental scale) and the relevance of carbon cycle science to carbon sequestration goals.
    Description: The National Center for Atmospheric Research is supported by the National Science Foundation.
    Keywords: Carbon sequestration ; Measurement techniques ; Climate ; Kyoto protocol
    Repository Name: Woods Hole Open Access Server
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  • 40
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    Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer : eolian imprint, spatiotemporal variability, and ecological implications (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 19 (2005): GB4006, doi:10.1029/2004GB002445.
    Description: We report iron measurements for water column and aerosol samples collected in the Sargasso Sea during July-August 2003 (summer 2003) and April-May 2004 (spring 2004). Our data reveal a large seasonal change in the dissolved iron (dFe) concentration of surface waters in the Bermuda Atlantic Time-series Study region, from ∼1–2 nM in summer 2003, when aerosol iron concentrations were high (mean 10 nmol m−3), to ∼0.1–0.2 nM in spring 2004, when aerosol iron concentrations were low (mean 0.64 nmol m−3). During summer 2003, we observed an increase of ∼0.6 nM in surface water dFe concentrations over 13 days, presumably due to eolian iron input; an estimate of total iron deposition over this same period suggests an effective solubility of 3–30% for aerosol iron. Our summer 2003 water column profiles show potentially growth-limiting dFe concentrations (0.02–0.19 nM) coinciding with a deep chlorophyll maximum at 100–150 m depth, where phytoplankton biomass is typically dominated by Prochlorococcus during late summer.
    Description: Funding for this work was provided by the U.S. National Science Foundation (OCE-0222053 to P. N. S., OCE-0222046 to T. M. C., and OCE-0241310 to D. J. M.), the U.S. National Aeronautics and Space Administration (NAG5-11265 to D. J. M.), the Australian Research Council (DP0342826 to A. R. B.), the Antarctic Climate and Ecosystems Cooperative Research Center, and the H. Unger Vetlesen Foundation.
    Keywords: Atmospheric deposition ; Iron ; Sargasso Sea
    Repository Name: Woods Hole Open Access Server
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    Newtonian versus non-Newtonian upper mantle viscosity : implications for subduction initiation (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 32 (2005): L19304, doi:10.1029/2005GL023457.
    Description: The effect of rheology on the evolution of the slab-tip during subduction initiation is analyzed using 2-D numerical flow models. Experimentally determined flow laws have both strong temperature- and stress-dependence, which leads to large local variations in viscosity with direct consequences for subduction initiation. We find that models with Newtonian viscosity lead to flat or coupled subduction due to hydrodynamic stresses that pull the slab-tip up towards the overriding plate. Non-Newtonian rheology reduces these hydrodynamic stresses by decreasing the wedge viscosity and the slab coupling to wedge-corner flow, rendering the small negative-slab buoyancy of the slab-tip sufficient to maintain its dip during the early stages of subduction.
    Keywords: Dynamics of lithosphere and mantle ; Plate boundary ; Rheology: mantle ; Subduction zone processes
    Repository Name: Woods Hole Open Access Server
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    Mid-ocean microseisms (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 6 (2005): Q04009, doi:10.1029/2004GC000768.
    Description: The Hawaii-2 Observatory (H2O) is an excellent site for studying the source regions and propagation of microseisms since it is located far from shorelines and shallow water. During Leg 200 of the Ocean Drilling Program, the officers of the JOIDES Resolution took wind and wave measurements for comparison with double-frequency (DF) microseism data collected at nearby H2O. The DF microseism band can be divided into short period and long period bands, SPDF and LPDF, respectively. Comparison of the ship’s weather log with the seismic data in the SPDF band from about 0.20 to 0.45 Hz shows a strong correlation of seismic amplitude with wind speed and direction, implying that the energy reaching the ocean floor is generated locally by ocean gravity waves. Near-shore land seismic stations see similar SPDF spectra, also generated locally by wind seas. At H2O, SPDF microseism amplitudes lag sustained changes in wind speed and direction by several hours, with the lag increasing with wave period. This lag may be associated with the time necessary for the development of opposing seas for DF microseism generation. Correlation of swell height above H2O with the LPDF band from 0.085 to 0.20 Hz is often poor, implying that a significant portion of this energy originates at distant locations. Correlation of the H2O seismic data with NOAA buoy data, with hindcast wave height data from the North Pacific, and with seismic data from mainland and island stations, defines likely source areas of the LPDF signals. Most of the LPDF energy at H2O appears to be generated by high amplitude storm waves impacting long stretches of coastline nearly simultaneously, and the Hawaiian Islands appear to be a significant source of LPDF energy in the North Pacific when waves arrive from particular directions. The highest DF levels observed at mid-ocean site H2O occur in the SPDF band when two coincident nearby storm systems develop. Mid-ocean generated DF microseisms are not observed at interior continental sites, indicating high attenuation of these signals. At near-coastal seismic stations, both SPDF and LPDF microseism levels are generally dominated by local generation at nearby shorelines.
    Description: This work was supported by the U.S. Science Support Program (User Reference: 418920-BA372; Task Order F001602) associated with the Ocean Drilling Program and is sponsored by the National Science Foundation and the Joint Oceanographic Institutions, Inc. Additional support was provided by the California Energy Commission and the California Department of Boating and Waterways as part of their program to improve boating facilities, access, safety, and education. Support for Ralph Stephen was also provided by the National Science Foundation under Grant #OCE-0424633.
    Keywords: Microseisms ; Ocean gravity waves ; Seismic noise ; Rayleigh wave attenuation ; Oceanic Q ; Hawaii-2 Observatory
    Repository Name: Woods Hole Open Access Server
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    Last deglaciation in the Okinawa Trough : subtropical northwest Pacific link to Northern Hemisphere and tropical climate (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA4005, doi:10.1029/2004PA001061.
    Description: Detailed deglacial and Holocene records of planktonic δ18O and Mg/Ca–based sea surface temperature (SST) from the Okinawa Trough suggest that at ∼18 to 17 thousand years before present (kyr B.P.), late spring/early summer SSTs were approximately 3°C cooler than today, while surface waters were up to 1 practical salinity unit saltier. These conditions are consistent with a weaker influence of the summer East Asian Monsoon (EAM) than today. The timing of suborbital SST oscillations suggests a close link with abrupt changes in the EAM and North Atlantic climate. A tropical influence, however, may have resulted in subtle decoupling between the North Atlantic and the Okinawa Trough/EAM during the deglaciation. Okinawa Trough surface water trends in the Holocene are consistent with model simulations of an inland shift of intense EAM precipitation during the middle Holocene. Millennial-scale alternations between relatively warm, salty conditions and relatively cold, fresh conditions suggest varying influence of the Kuroshio during the Holocene.
    Description: Funding for this research was provided by NSFC (grants 40106006 and 40206007), SKLLQG (grant LLQG0204), and the NSF (OCE-020776 to DWO). Y.S.'s visit to WHOI was supported via a NSF START Fellowship.
    Keywords: Okinawa Trough ; Deglaciation ; Holocene ; Kuroshio Current ; East Asian monsoon ; Mg/Ca ; Oxygen isotopes ; Foraminifera
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  • 44
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    Vertical motions of the Puerto Rico Trench and Puerto Rico and their cause (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: This paper is not subject to U.S. copyright. Published in 2005 by the American Geophysical Union. The definitive version was published in Journal of Geophysical Research 110 (2005): B06404, doi:10.1029/2004JB003459.
    Description: The Puerto Rico trench exhibits great water depth, an extremely low gravity anomaly, and a tilted carbonate platform between (reconstructed) elevations of +1300 m and −4000 m. I argue that these features are manifestations of large vertical movements of a segment of the Puerto Rico trench, its forearc, and the island of Puerto Rico that took place 3.3 m.y. ago over a time period as short as 14–40 kyr. I explain these vertical movements by a sudden increase in the slab's descent angle that caused the trench to subside and the island to rise. The increased dip could have been caused by shearing or even by a complete tear of the descending North American slab, although the exact nature of this deformation is unknown. The rapid (14–40 kyr) and uniform tilt along a 250 km long section of the trench is compatible with scales of mantle flow and plate bending. The proposed shear zone or tear is inferred from seismic, morphological, and gravity observations to start at the trench at 64.5°W and trend southwestwardly toward eastern Puerto Rico. The tensile stresses necessary to deform or tear the slab could have been generated by increased curvature of the trench following a counterclockwise rotation of the upper plate and by the subduction of a large seamount.
    Keywords: Dynamic topography ; Slab tear ; Puerto Rico trench ; Caribbean plate ; Challenger Deep ; Seamount subduction
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    Design and function of superfast muscles : new insights into the physiology of skeletal muscle (2005)
    Annual Reviews
    Details
    Publication Date: 2022-05-25
    Description: First published online as a Review in Advance on October 24, 2005. (Some corrections may occur before final publication online and in print)
    Description: Author Posting. © Annual Reviews, 2005. This article is posted here by permission of Annual Reviews for personal use, not for redistribution. The definitive version was published in Annual Review of Physiology 68 (2006): 22.1-22.29, doi:10.1146/annurev.physiol.68.040104.105418.
    Description: Superfast muscles of vertebrates power sound production. The fastest, the swimbladder muscle of toadfish, generates mechanical power at frequencies in excess of 200 Hz. To operate at these frequencies, the speed of relaxation has had to increase approximately 50-fold. This increase is accomplished by modifications of three kinetic traits: (a) a fast calcium transient due to extremely high concentration of sarcoplasmic reticulum (SR)-Ca2+ pumps and parvalbumin, (b) fast off-rate of Ca2+ from troponin C due to an alteration in troponin, and (c) fast cross-bridge detachment rate constant (g, 50 times faster than that in rabbit fast-twitch muscle) due to an alteration in myosin. Although these three modifications permit swimbladder muscle to generate mechanical work at high frequencies (where locomotor muscles cannot), it comes with a cost: The high g causes a large reduction in attached force-generating cross-bridges, making the swimbladder incapable of powering low-frequency locomotory movements. Hence the locomotory and sound-producing muscles have mutually exclusive designs.
    Description: This work was made possible by support from NIH grants AR38404 and AR46125 as well as the University of Pennsylvania Research Foundation.
    Keywords: Parvalbumin ; Ca2+ release ; Ca2+ uptake ; Cross-bridges ; Adaptation ; Sound production ; Whitman Center
    Repository Name: Woods Hole Open Access Server
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    Plateau-style accumulation of deformation: Southern Altiplano (2005)
    American Geophysical Union
    In:  EPIC3Tectonics, American Geophysical Union, 24(TC4020), pp. 1-19
    Details
    Publication Date: 2019-07-17
    Description: Employing surface mapping of syntectonic sediments, interpretation of industry reflection-seismic profiles, gravity data, and isotopic age dating, we reconstruct the tectonic evolution of the southern Altiplano (∼20–22°S) between the cordilleras defining its margins. The southern Altiplano crust was deformed between the late Oligocene and the late Miocene with two main shortening stages in the Oligocene (33–27 Ma) and middle/late Miocene (19–8 Ma) that succeeded Eocene onset of shortening at the protoplateau margins. Shortening rates in the southern Altiplano ranged between 1 and 4.7 mm/yr with maximum rates in the late Miocene. Summing rates for the southern Altiplano and the Eastern Cordillera, we observe an increase from Eocene times to the late Oligocene to some 8 mm/yr, followed by fluctuation around this value during the Miocene prior to shutoff of deformation at 7–8 Ma and transfer of active shortening to the sub-Andean fold and thrust belt. Shortening inverted early Tertiary graben and half graben systems and was partitioned in three fault systems in the western, central, and eastern Altiplano, respectively. The east vergent fault systems of the western and central Altiplano were synchronously active with the west vergent Altiplano west flank fault system. From these data and from section balancing, we infer a kinematically linked western Altiplano thrust belt that accumulated a minimum of 65 km shortening. Evolution of this belt contrasts with the Eastern Cordillera, which reached peak shortening rates (8 mm/yr) in between the above two stages. Hence local shortening rates fluctuated across the plateau superimposed on a general trend of increasing bulk rate with no trend of lateral propagation. This observation is repeated at the shorter length and time scales of individual growth structures that show evidence for periods of enhanced local rates at a timescale of 1–3 Myr. We interpret this irregular pattern of deformation to reflect a plateau-style of shortening related to a self-organized state of a weak crust in the central South American back arc with a fault network that fluctuated around the critical state of mechanical failure. Tuning of this state may have occurred by changes in plate kinematics, during the Paleogene, initially reactivating crustal weak zones and by thermal weakening of the crust with active magmatism mainly in the Neogene stage.
    Repository Name: EPIC Alfred Wegener Institut
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    A general inversion for end-member ratios in binary mixing systems (2005)
    American Geophysical Union
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 6 (2005): Q11007, doi:10.1029/2005GC000975.
    Description: Binary mixing is one of the most common models used to explain variations in geochemical data. When the data being modeled are ratios of elements or isotopes, the mixtures follow hyperbolic trends with curvatures that depend on a cross-term representing the relative concentrations of the elements or isotopes under consideration in the mixing components. The inverse problem of estimating mixing components is difficult because of the cross-term in the hyperbolic equation, which requires the use of nonlinear methods to estimate the mixing parameters, and because the end-member ratio values are intrinsically underdetermined unless the mixing proportions of the samples are known a priori, which is not generally the case. I use maximum likelihood methods to address these issues and derive a general inversion for binary mixing model parameters from ratio-ratio data. I apply the method to synthetic test data and a global compilation of 230Th/232Th versus 87Sr/86Sr data from oceanic basalts and find that the concentration ratio parameter is well-constrained by the inversion while the end-member ratio estimates are strongly dependent on the initial guesses used to start the iterative solver, reflecting the underdetermined nature of the end-member positions on the mixing hyperbola. Monte Carlo methods that randomly perturb the initial guesses can be used to improve error estimates, and goodness-of-fit statistics can be used to assess the performance of the mixing model for explaining data variance.
    Keywords: Inverse theory ; Isotopes ; Mixing
    Repository Name: Woods Hole Open Access Server
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    Geophysics: Singing icebergs (2005)
    American Association for the Advancement of Science (AAAS)
    In:  EPIC3Science, American Association for the Advancement of Science (AAAS), 310(5752), pp. 1299-1299, ISSN: 0036-8075
    Details
    Publication Date: 2023-06-13
    Description: 〈jats:p〉Sustained harmonic tremor signals were recorded by the seismographs of the German Neumayer Base seismological network in western Dronning Maud Land, Antarctica. These tremor episodes, lasting up to 16 hours, were recorded up to 820 kilometers from the source. Their spectra show narrow peaks with fundamental frequencies ranging from 0.5 to 6 hertz, more than 30 integer harmonic overtones, and frequency gliding, resembling volcanic tremor. Frequency‐wave number analysis suggested a moving source, which was recognized as iceberg B-09A traveling along the coast of eastern Antarctica. The most probable tremor sources are fluid-flow‐induced vibrations inside the iceberg's tunnel/crevasse systems.〈/jats:p〉
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    Fermionic superfluidity with imbalanced spin populations (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-12-24
    Description: We established superfluidity in a two-state mixture of ultracold fermionic atoms with imbalanced state populations. This study relates to the long-standing debate about the nature of the superfluid state in Fermi systems. Indicators for superfluidity were condensates of fermion pairs and vortices in rotating clouds. For strong interactions, near a Feshbach resonance, superfluidity was observed for a broad range of population imbalances. We mapped out the superfluid regime as a function of interaction strength and population imbalance and characterized the quantum phase transition to the normal state, known as the Pauli limit of superfluidity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zwierlein, Martin W -- Schirotzek, Andre -- Schunck, Christian H -- Ketterle, Wolfgang -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):492-6. Epub 2005 Dec 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Massachusetts Institute of Technology (MIT)-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA. zwierlei@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16373535" target="_blank"〉PubMed〈/a〉
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    Asymmetric hydrogenation of unfunctionalized, purely alkyl-substituted olefins (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-12-13
    Description: Asymmetric hydrogenation of olefins is one of the most useful reactions for the synthesis of optically active compounds, especially in industry. However, the application range of the catalysts developed so far is limited to alkenes with a coordinating functional group or an aryl substituent next to the double bond. We have found a class of chiral iridium catalysts that give high enantioselectivity in the hydrogenation of unfunctionalized, trialkyl-substituted olefins. Because these catalysts do not require the presence of any particular functional group or aryl substituent in the substrate, they considerably broaden the scope of asymmetric hydrogenation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, Sharon -- Wustenberg, Bettina -- Kaiser, Stefan -- Menges, Frederik -- Netscher, Thomas -- Pfaltz, Andreas -- New York, N.Y. -- Science. 2006 Feb 3;311(5761):642-4. Epub 2005 Dec 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Basel, St. JohannsRing 19, CH-4056 Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16339409" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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    A clonogenic bone marrow progenitor specific for macrophages and dendritic cells (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-12-03
    Description: Macrophages and dendritic cells (DCs) are crucial for immune and inflammatory responses and belong to a network of cells that has been termed the mononuclear phagocyte system (MPS). However, the origin and lineage of these cells remain poorly understood. Here, we describe the isolation and clonal analysis of a mouse bone marrow progenitor that is specific for monocytes, several macrophage subsets, and resident spleen DCs in vivo. It was also possible to recapitulate this differentiation in vitro by using treatment with the cytokines macrophage colony-stimulating factor and granulocyte-macrophage colony-stimulating factor. Thus, macrophages and DCs appear to renew from a common progenitor, providing a cellular and molecular basis for the concept of the MPS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fogg, Darin K -- Sibon, Claire -- Miled, Chaouki -- Jung, Steffen -- Aucouturier, Pierre -- Littman, Dan R -- Cumano, Ana -- Geissmann, Frederic -- A133856/PHS HHS/ -- G0900867/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2006 Jan 6;311(5757):83-7. Epub 2005 Dec 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INSERM, Laboratory of Mononuclear Phagocyte Biology, Avenir Team, Necker Enfants Malades Institute, 75015 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16322423" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Lineage ; Cell Separation ; Clone Cells ; Colony-Stimulating Factors/pharmacology ; Dendritic Cells/*cytology ; Flow Cytometry ; Granulocyte Colony-Stimulating Factor/pharmacology ; Hematopoietic Stem Cell Transplantation ; Macrophage Colony-Stimulating Factor/pharmacology ; Macrophages/*cytology ; Mice ; Mice, Inbred C57BL ; Myeloid Progenitor Cells/*cytology/immunology ; Proto-Oncogene Proteins c-kit/analysis ; Receptors, Cytokine/analysis ; Receptors, HIV/analysis ; Recombinant Proteins ; Spleen/cytology
    Print ISSN: 0036-8075
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    The coming paradigm shift in forensic identification science (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-08-06
    Description: Converging legal and scientific forces are pushing the traditional forensic identification sciences toward fundamental change. The assumption of discernible uniqueness that resides at the core of these fields is weakened by evidence of errors in proficiency testing and in actual cases. Changes in the law pertaining to the admissibility of expert evidence in court, together with the emergence of DNA typing as a model for a scientifically defensible approach to questions of shared identity, are driving the older forensic sciences toward a new scientific paradigm.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saks, Michael J -- Koehler, Jonathan J -- New York, N.Y. -- Science. 2005 Aug 5;309(5736):892-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Law, Arizona State University, Tempe, AZ 85287, USA. saks@asu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16081727" target="_blank"〉PubMed〈/a〉
    Keywords: DNA/classification ; Expert Testimony ; Forecasting ; Forensic Sciences/legislation & jurisprudence/*trends ; Humans ; Models, Theoretical ; Reproducibility of Results
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    Genotypic diversity within a natural coastal bacterioplankton population (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-26
    Description: The genomic diversity and relative importance of distinct genotypes within natural bacterial populations have remained largely unknown. Here, we analyze the diversity and annual dynamics of a group of coastal bacterioplankton (greater than 99% 16S ribosomal RNA identity to Vibrio splendidus). We show that this group consists of at least a thousand distinct genotypes, each occurring at extremely low environmental concentrations (on average less than one cell per milliliter). Overall, the genomes show extensive allelic diversity and size variation. Individual genotypes rarely recurred in samples, and allelic distribution did not show spatial or temporal substructure. Ecological considerations suggest that much genotypic and possibly phenotypic variation within natural populations should be considered neutral.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thompson, Janelle R -- Pacocha, Sarah -- Pharino, Chanathip -- Klepac-Ceraj, Vanja -- Hunt, Dana E -- Benoit, Jennifer -- Sarma-Rupavtarm, Ramahi -- Distel, Daniel L -- Polz, Martin F -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1311-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15731455" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Chaperonin 60/genetics ; *Ecosystem ; Electrophoresis, Gel, Pulsed-Field ; *Genetic Variation ; Genome, Bacterial ; Genotype ; Molecular Sequence Data ; Plankton/classification/*genetics/growth & development/isolation & purification ; Polymerase Chain Reaction ; Ribotyping ; Seawater/*microbiology ; Time Factors ; Vibrio/classification/*genetics/isolation & purification
    Print ISSN: 0036-8075
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    Biomedical research. Despite protests, MRC to move its largest institute into London (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marshall, Eliot -- New York, N.Y. -- Science. 2005 Feb 18;307(5712):1028.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15718438" target="_blank"〉PubMed〈/a〉
    Keywords: Academies and Institutes/economics/*organization & administration ; *Biomedical Research ; Financing, Government ; Government Agencies ; London ; Universities/*organization & administration
    Print ISSN: 0036-8075
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    Questions About Orrorin Femur (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ohman, James C -- Lovejoy, C Owen -- White, Tim D -- Eckhardt, Robert B -- Galik, Karol -- Kuperavage, Adam J -- New York, N.Y. -- Science. 2005 Feb 11;307(5711):845b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15708839" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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    Representation of action-specific reward values in the striatum (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-29
    Description: The estimation of the reward an action will yield is critical in decision-making. To elucidate the role of the basal ganglia in this process, we recorded striatal neurons of monkeys who chose between left and right handle turns, based on the estimated reward probabilities of the actions. During a delay period before the choices, the activity of more than one-third of striatal projection neurons was selective to the values of one of the two actions. Fewer neurons were tuned to relative values or action choice. These results suggest representation of action values in the striatum, which can guide action selection in the basal ganglia circuit.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Samejima, Kazuyuki -- Ueda, Yasumasa -- Doya, Kenji -- Kimura, Minoru -- New York, N.Y. -- Science. 2005 Nov 25;310(5752):1337-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Computational Neurobiology, ATR Computational Neuroscience Laboratories, 619-0288 Kyoto, Japan. samejima@lab.tamagawa.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16311337" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Mapping ; Caudate Nucleus/*physiology ; *Choice Behavior ; Corpus Striatum/*physiology ; Female ; Macaca ; Male ; Neurons/*physiology ; Probability ; Putamen/*physiology ; Regression Analysis ; Reinforcement (Psychology) ; *Reward
    Print ISSN: 0036-8075
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    New directions in plastic debris (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thompson, Richard -- Moore, Charles -- Andrady, Anthony -- Gregory, Murray -- Takada, Hideshige -- Weisberg, Stephen -- New York, N.Y. -- Science. 2005 Nov 18;310(5751):1117.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16293739" target="_blank"〉PubMed〈/a〉
    Keywords: *Environmental Pollutants ; *Plastics ; Waste Management
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    U.S. fusion research. With domestic program at issue, House votes to hold up funding for ITER (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kintisch, Eli -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1395.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15933171" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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    Elephants, ecology, and nonequilibrium? (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Illius, Andrew W -- New York, N.Y. -- Science. 2005 Feb 4;307(5710):674; author reply 674.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15714610" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Conservation of Natural Resources ; Ecology ; *Ecosystem ; Elephants ; Environment ; *Mammals ; Population Density ; Population Dynamics
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    Retention of xenon in quartz and Earth's missing xenon (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-19
    Description: The reactivity of xenon with terrestrial oxides was investigated by in situ synchrotron x-ray diffraction. At high temperature (T 〉 500 kelvin), some silicon was reduced, and the pressure stability of quartz was expanded, attesting to the substitution of some xenon for silicon. When the quartz was quenched, xenon diffused out and only a few weight percent remained trapped in samples. These results show that xenon can be covalently bonded to oxygen in quartz in the lower continental crust, providing an answer to the missing xenon problem; synthesis paths of rare gas compounds are also opened.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanloup, Chrystele -- Schmidt, Burkhard C -- Chamorro Perez, Eva Maria -- Jambon, Albert -- Gregoryanz, Eugene -- Mezouar, Mohamed -- New York, N.Y. -- Science. 2005 Nov 18;310(5751):1174-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universite Pierre et Marie Curie and Institut de Physique du Globe de Paris, 75252 Paris, France. sanloup@ccr.jussieu.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16293758" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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    NIH training grants. Universities may have to pay more in support of graduate training (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-12-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bhattacharjee, Yudhijit -- New York, N.Y. -- Science. 2005 Dec 9;310(5754):1601.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16339419" target="_blank"〉PubMed〈/a〉
    Keywords: Budgets ; Education, Graduate/*economics ; Financing, Government ; National Institutes of Health (U.S.)/*economics ; *Training Support ; United States ; Universities/*economics
    Print ISSN: 0036-8075
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    Questions about Orrorin femur (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ohman, James C -- Lovejoy, C Owen -- White, Tim D -- New York, N.Y. -- Science. 2005 Feb 11;307(5711):845; author reply 845.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15709231" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Femoral Neck Fractures/pathology ; Femur/*anatomy & histology/radiography ; Femur Neck/anatomy & histology/radiography ; *Fossils ; Hominidae/*anatomy & histology/physiology ; Humans ; Locomotion ; Tomography, X-Ray Computed
    Print ISSN: 0036-8075
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    The centromeric protein Sgo1 is required to sense lack of tension on mitotic chromosomes (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-01-08
    Description: Chromosome alignment on the mitotic spindle is monitored by the spindle checkpoint. We identify Sgo1, a protein involved in meiotic chromosome cohesion, as a spindle checkpoint component. Budding yeast cells with mutations in SGO1 respond normally to microtubule depolymerization but not to lack of tension at the kinetochore, and they have difficulty attaching sister chromatids to opposite poles of the spindle. Sgo1 is thus required for sensing tension between sister chromatids during mitosis, and its degradation when they separate may prevent cell cycle arrest and chromosome loss in anaphase, a time when sister chromatids are no longer under tension.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Indjeian, Vahan B -- Stern, Bodo M -- Murray, Andrew W -- GM043987/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2005 Jan 7;307(5706):130-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15637284" target="_blank"〉PubMed〈/a〉
    Keywords: Anaphase ; Anaphase-Promoting Complex-Cyclosome ; Cell Cycle ; Cell Cycle Proteins/metabolism ; Chromatids/physiology ; Chromosomal Proteins, Non-Histone ; Chromosome Segregation ; Chromosomes, Fungal/*physiology ; Kinetochores/physiology ; *Mitosis ; Mutation ; Nuclear Proteins/genetics/metabolism/*physiology ; Phosphoproteins/metabolism ; Protein-Serine-Threonine Kinases/metabolism ; Protein-Tyrosine Kinases/metabolism ; Saccharomyces cerevisiae/genetics/*physiology ; Saccharomyces cerevisiae Proteins/genetics/metabolism/*physiology ; Spindle Apparatus/*physiology ; Ubiquitin-Protein Ligase Complexes/metabolism
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    Neuroimaging. An image of disease (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olson, Steve -- New York, N.Y. -- Science. 2005 Mar 11;307(5715):1550.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15761133" target="_blank"〉PubMed〈/a〉
    Keywords: *Bioethical Issues ; Brain/anatomy & histology/*pathology ; Brain Diseases/*diagnosis ; *Diagnostic Imaging ; Humans ; *Incidental Findings ; *Research Subjects
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    Titan's atmospheric temperatures, winds, and composition (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-17
    Description: Temperatures obtained from early Cassini infrared observations of Titan show a stratopause at an altitude of 310 kilometers (and 186 kelvin at 15 degrees S). Stratospheric temperatures are coldest in the winter northern hemisphere, with zonal winds reaching 160 meters per second. The concentrations of several stratospheric organic compounds are enhanced at mid- and high northern latitudes, and the strong zonal winds may inhibit mixing between these latitudes and the rest of Titan. Above the south pole, temperatures in the stratosphere are 4 to 5 kelvin cooler than at the equator. The stratospheric mole fractions of methane and carbon monoxide are (1.6 +/- 0.5) x 10(-2) and (4.5 +/- 1.5) x 10(-5), respectively.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flasar, F M -- Achterberg, R K -- Conrath, B J -- Gierasch, P J -- Kunde, V G -- Nixon, C A -- Bjoraker, G L -- Jennings, D E -- Romani, P N -- Simon-Miller, A A -- Bezard, B -- Coustenis, A -- Irwin, P G J -- Teanby, N A -- Brasunas, J -- Pearl, J C -- Segura, M E -- Carlson, R C -- Mamoutkine, A -- Schinder, P J -- Barucci, A -- Courtin, R -- Fouchet, T -- Gautier, D -- Lellouch, E -- Marten, A -- Prange, R -- Vinatier, S -- Strobel, D F -- Calcutt, S B -- Read, P L -- Taylor, F W -- Bowles, N -- Samuelson, R E -- Orton, G S -- Spilker, L J -- Owen, T C -- Spencer, J R -- Showalter, M R -- Ferrari, C -- Abbas, M M -- Raulin, F -- Edgington, S -- Ade, P -- Wishnow, E H -- New York, N.Y. -- Science. 2005 May 13;308(5724):975-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15894528" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Monoxide ; Extraterrestrial Environment ; *Hydrocarbons ; *Methane ; *Nitriles ; *Saturn ; Spacecraft ; Temperature ; Wind
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    U.K. universities. Cash-short schools aim to raise fees, recruit foreign students (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marshall, Eliot -- New York, N.Y. -- Science. 2005 Feb 4;307(5710):656.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15692023" target="_blank"〉PubMed〈/a〉
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    Ecology. Israeli controversy blossoms over protecting Gilboa iris (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-05-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kintisch, Eli -- New York, N.Y. -- Science. 2005 May 27;308(5726):1251.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15919972" target="_blank"〉PubMed〈/a〉
    Keywords: *Conservation of Natural Resources ; *Ecosystem ; *Environment ; Genetic Variation ; Housing ; *Iridaceae/genetics/growth & development ; Israel ; *Residence Characteristics
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    Adaptive coding of reward value by dopamine neurons (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-03-12
    Description: It is important for animals to estimate the value of rewards as accurately as possible. Because the number of potential reward values is very large, it is necessary that the brain's limited resources be allocated so as to discriminate better among more likely reward outcomes at the expense of less likely outcomes. We found that midbrain dopamine neurons rapidly adapted to the information provided by reward-predicting stimuli. Responses shifted relative to the expected reward value, and the gain adjusted to the variance of reward value. In this way, dopamine neurons maintained their reward sensitivity over a large range of reward values.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tobler, Philippe N -- Fiorillo, Christopher D -- Schultz, Wolfram -- 095495/Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2005 Mar 11;307(5715):1642-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK, and Institute of Physiology, University of Fribourg, CH-1700 Fribourg, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15761155" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; Animals ; Discrimination (Psychology) ; Dopamine/*physiology ; Electrophysiology ; Female ; Learning ; Macaca fascicularis ; Mesencephalon/cytology/*physiology ; Neurons/*physiology ; Photic Stimulation ; Probability ; *Reward
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    Proposition 71. Proposed legislation threatens to slow California stem cell rush (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Jon -- New York, N.Y. -- Science. 2005 Mar 25;307(5717):1857.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15790821" target="_blank"〉PubMed〈/a〉
    Keywords: California ; Cell Line ; Cloning, Organism ; *Embryo Research/economics/legislation & jurisprudence ; Embryo, Mammalian/*cytology ; Humans ; *Research Support as Topic/legislation & jurisprudence ; *Stem Cells ; Tissue Donors/legislation & jurisprudence
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    Retraction (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-12-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flavell, Richard A -- Kaczmarek, Leonard K -- Badou, Abdallah -- Boulpaep, Emile L -- Desai, Rooma -- Basavappa, Srisaila -- Matza, Didi -- Peng, You-Qing -- Mehal, Wajahat Z -- New York, N.Y. -- Science. 2005 Dec 23;310(5756):1903.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16373558" target="_blank"〉PubMed〈/a〉
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    Neuroimaging. Brain scans raise privacy concerns (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olson, Steve -- New York, N.Y. -- Science. 2005 Mar 11;307(5715):1548-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15761132" target="_blank"〉PubMed〈/a〉
    Keywords: *Bioethical Issues ; Brain/*anatomy & histology/*physiology ; Confidentiality ; Deception ; *Diagnostic Imaging ; Humans ; *Mental Processes ; *Personality ; *Privacy
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    The influence of social hierarchy on primate health (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-04-30
    Description: Dominance hierarchies occur in numerous social species, and rank within them can greatly influence the quality of life of an animal. In this review, I consider how rank can also influence physiology and health. I first consider whether it is high- or low-ranking animals that are most stressed in a dominance hierarchy; this turns out to vary as a function of the social organization in different species and populations. I then review how the stressful characteristics of social rank have adverse adrenocortical, cardiovascular, reproductive, immunological, and neurobiological consequences. Finally, I consider how these findings apply to the human realm of health, disease, and socioeconomic status.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sapolsky, Robert M -- New York, N.Y. -- Science. 2005 Apr 29;308(5722):648-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Biological Sciences, Neurology and Neurological Sciences, Stanford University, MC 5020, Stanford, CA 94305-5020, USA. sapolsky@stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15860617" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anxiety ; Behavior, Animal ; Cardiovascular Physiological Phenomena ; Catecholamines/metabolism ; Dominance-Subordination ; *Health Status ; Humans ; Hydrocortisone/metabolism ; Immune System/physiology ; Nervous System Physiological Phenomena ; *Primates/physiology/psychology ; Reproduction ; *Social Behavior ; Social Class ; *Social Dominance ; *Stress, Physiological/physiopathology
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    Wet electrons at the H2O/TiO2(110) surface (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-05-21
    Description: At interfaces of metal oxide and water, partially hydrated or "wet-electron" states represent the lowest energy pathway for electron transfer. We studied the photoinduced electron transfer at the H2O/TiO2(110) interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At approximately 1-monolayer coverage of water on partially hydroxylated TiO2 surfaces, we found an unoccupied electronic state 2.4 electron volts above the Fermi level. Density functional theory shows this to be a wet-electron state analogous to that reported in water clusters and which is distinct from hydrated electrons observed on water-covered metal surfaces. The decay of electrons from the wet-electron state to the conduction band of TiO2 occurs in 〈/=15 femtoseconds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Onda, Ken -- Li, Bin -- Zhao, Jin -- Jordan, Kenneth D -- Yang, Jinlong -- Petek, Hrvoje -- New York, N.Y. -- Science. 2005 May 20;308(5725):1154-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15905397" target="_blank"〉PubMed〈/a〉
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    Inferences of competence from faces predict election outcomes (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-06-11
    Description: We show that inferences of competence based solely on facial appearance predicted the outcomes of U.S. congressional elections better than chance (e.g., 68.8% of the Senate races in 2004) and also were linearly related to the margin of victory. These inferences were specific to competence and occurred within a 1-second exposure to the faces of the candidates. The findings suggest that rapid, unreflective trait inferences can contribute to voting choices, which are widely assumed to be based primarily on rational and deliberative considerations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Todorov, Alexander -- Mandisodza, Anesu N -- Goren, Amir -- Hall, Crystal C -- New York, N.Y. -- Science. 2005 Jun 10;308(5728):1623-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, Princeton University, Princeton, NJ 08544, USA. atodorov@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15947187" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Character ; Decision Making ; *Face/anatomy & histology ; Federal Government ; Female ; Forecasting ; Humans ; Intelligence ; Judgment ; Leadership ; Male ; *Mental Competency ; *Politics ; *Social Perception ; Stereotyping ; Trust ; United States
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    Neurodegeneration. Huntington's research points to possible new therapies (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-10-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, Jean -- New York, N.Y. -- Science. 2005 Oct 7;310(5745):43-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16210515" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autophagy ; Brain-Derived Neurotrophic Factor/metabolism ; Cells, Cultured ; Clinical Trials as Topic ; Corpus Striatum/pathology ; Disease Models, Animal ; Gene Expression Regulation ; Humans ; Huntington Disease/*drug therapy/genetics/pathology/*physiopathology ; Mice ; Mitochondria/metabolism ; Mutation ; Nerve Tissue Proteins/chemistry/*genetics/metabolism/*physiology ; Neurons/*physiology ; Nuclear Proteins/chemistry/*genetics/metabolism/*physiology ; Peptides ; Transcription Factors/metabolism ; Trinucleotide Repeat Expansion
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    Phosphorylation and regulation of Akt/PKB by the rictor-mTOR complex (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-02-19
    Description: Deregulation of Akt/protein kinase B (PKB) is implicated in the pathogenesis of cancer and diabetes. Akt/PKB activation requires the phosphorylation of Thr308 in the activation loop by the phosphoinositide-dependent kinase 1 (PDK1) and Ser473 within the carboxyl-terminal hydrophobic motif by an unknown kinase. We show that in Drosophila and human cells the target of rapamycin (TOR) kinase and its associated protein rictor are necessary for Ser473 phosphorylation and that a reduction in rictor or mammalian TOR (mTOR) expression inhibited an Akt/PKB effector. The rictor-mTOR complex directly phosphorylated Akt/PKB on Ser473 in vitro and facilitated Thr308 phosphorylation by PDK1. Rictor-mTOR may serve as a drug target in tumors that have lost the expression of PTEN, a tumor suppressor that opposes Akt/PKB activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sarbassov, D D -- Guertin, David A -- Ali, Siraj M -- Sabatini, David M -- R01 AI47389/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2005 Feb 18;307(5712):1098-101.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research and Department of Biology, Massachusetts Institute of Technology, Nine Cambridge Center, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15718470" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Phosphoinositide-Dependent Protein Kinases ; Adaptor Proteins, Signal Transducing ; Animals ; Carrier Proteins/*metabolism ; Cell Line ; Cell Line, Tumor ; Drosophila Proteins/*metabolism ; Drosophila melanogaster ; Enzyme Activation ; Humans ; Hydrophobic and Hydrophilic Interactions ; Immunoprecipitation ; Phosphatidylinositol 3-Kinases/*metabolism ; Phosphorylation ; Protein Kinases/*metabolism ; Protein-Serine-Threonine Kinases/*metabolism ; Proteins/metabolism ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins c-akt ; RNA Interference ; Serine/metabolism ; TOR Serine-Threonine Kinases
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    What constitutes a proper description? (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-10-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Timm, Robert M -- Ramey, Rob Roy 2nd -- Nomenclature Committee of the American Society of Mammalogists -- New York, N.Y. -- Science. 2005 Sep 30;309(5744):2163-6; author reply 2163-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16195444" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cercocebus/*anatomy & histology/*classification ; Photography ; Tanzania ; *Terminology as Topic
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    Scientific publication. HHS Asks PNAS to pull bioterrorism paper (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-06-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Jon -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1395.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15933172" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bioterrorism/prevention & control ; Botulinum Toxins ; Food Supply ; Humans ; Milk ; *Periodicals as Topic ; Publishing ; *Retraction of Publication as Topic ; United States ; *United States Dept. of Health and Human Services
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    Cell signaling. Frizzled at the cutting edge of the synapse (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-11-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez Arias, Alfonso -- New York, N.Y. -- Science. 2005 Nov 25;310(5752):1284-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK. ama11@hermes.cam.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16311322" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Animals ; Cell Nucleus/metabolism ; Drosophila Proteins/chemistry/*metabolism ; Drosophila melanogaster/genetics/*metabolism ; Endocytosis ; Frizzled Receptors ; Models, Neurological ; Mutation ; Neuromuscular Junction/*metabolism ; Protein Structure, Tertiary ; Proto-Oncogene Proteins/*metabolism ; Receptors, G-Protein-Coupled ; Receptors, Neurotransmitter/chemistry/*metabolism ; *Signal Transduction ; Wnt1 Protein
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    Ecology. Savannah River Lab faces budget ax (2005)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2005-03-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kintisch, Eli -- New York, N.Y. -- Science. 2005 Mar 25;307(5717):1857.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15790820" target="_blank"〉PubMed〈/a〉
    Keywords: *Budgets ; *Ecology ; Georgia ; *Laboratories ; Radioactive Pollutants ; *Rivers ; United States ; United States Government Agencies ; Universities
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    Influenza. Study questions the benefits of vaccinating the elderly (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Jon -- New York, N.Y. -- Science. 2005 Feb 18;307(5712):1026.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15718436" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; *Aging ; Bias (Epidemiology) ; Cohort Studies ; Confounding Factors (Epidemiology) ; Epidemiologic Methods ; Humans ; *Immunization Programs ; *Influenza Vaccines ; Influenza, Human/*mortality/*prevention & control ; United States/epidemiology
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    Molecular biology. Nucleosomes help guide yeast gene activity (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, Jean -- New York, N.Y. -- Science. 2005 Jun 17;308(5729):1724.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15961637" target="_blank"〉PubMed〈/a〉
    Keywords: DNA Transposable Elements ; DNA, Fungal/*analysis/isolation & purification ; *Gene Expression Regulation, Fungal ; *Genome, Fungal ; Meiosis ; *Nucleosomes/chemistry ; Oligonucleotide Array Sequence Analysis ; Promoter Regions, Genetic ; Saccharomyces cerevisiae/*genetics
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    Micropylar pollen tube guidance by egg apparatus 1 of maize (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-01
    Description: Pollen tube guidance precedes the double fertilization of flowering plants. Here, we report the identification of a small maize protein of 94 amino acids involved in short-range signaling required for pollen tube attraction by the female gametophyte. ZmEA1 is exclusively expressed in the egg apparatus, consisting of the egg cell and two synergids. Chimeric ZmEA1 fused to green fluorescent protein (ZmEA1:GFP) was first visible within the filiform apparatus and later was localized to nucellar cell walls below the micropylar opening of the ovule. Transgenic down-regulation of the ZmEA1 gene led to ovule sterility caused by loss of close-range pollen tube guidance to the micropyle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marton, Mihaela L -- Cordts, Simone -- Broadhvest, Jean -- Dresselhaus, Thomas -- New York, N.Y. -- Science. 2005 Jan 28;307(5709):573-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biocenter Klein Flottbek, Developmental Biology and Biotechnology, University of Hamburg, Ohnhorststrasse 18, D-22609 Hamburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15681383" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antisense Elements (Genetics) ; Crosses, Genetic ; DNA, Complementary ; Flowers/growth & development/*physiology ; Genes, Plant ; Green Fluorescent Proteins/metabolism ; Molecular Sequence Data ; Plant Proteins/chemistry/*genetics/*physiology ; Plants, Genetically Modified ; Promoter Regions, Genetic ; Protein Structure, Tertiary ; RNA Interference ; Recombinant Fusion Proteins/metabolism ; Reproduction ; Seeds/physiology ; Sequence Homology, Nucleic Acid ; Signal Transduction ; Zea mays/*genetics/*physiology
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    The class of 2005: Germany. Tracking pollutants (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-10-22
    Description: Next year, German environmental chemist Martin Elsner will move from Toronto to the GSF National Research Centre for Environment and Health near Munich to take up his first tenure-track position as a Helmholtz Young Investigator.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forde, Anne -- New York, N.Y. -- Science. 2005 Oct 21;310(5747):521.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16239486" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Choice ; *Career Mobility ; Education, Graduate ; Germany ; *Water Pollutants
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    Amplification of surface temperature trends and variability in the tropical atmosphere (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-08-16
    Description: The month-to-month variability of tropical temperatures is larger in the troposphere than at Earth's surface. This amplification behavior is similar in a range of observations and climate model simulations and is consistent with basic theory. On multidecadal time scales, tropospheric amplification of surface warming is a robust feature of model simulations, but it occurs in only one observational data set. Other observations show weak, or even negative, amplification. These results suggest either that different physical mechanisms control amplification processes on monthly and decadal time scales, and models fail to capture such behavior; or (more plausibly) that residual errors in several observational data sets used here affect their representation of long-term trends.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Santer, B D -- Wigley, T M L -- Mears, C -- Wentz, F J -- Klein, S A -- Seidel, D J -- Taylor, K E -- Thorne, P W -- Wehner, M F -- Gleckler, P J -- Boyle, J S -- Collins, W D -- Dixon, K W -- Doutriaux, C -- Free, M -- Fu, Q -- Hansen, J E -- Jones, G S -- Ruedy, R -- Karl, T R -- Lanzante, J R -- Meehl, G A -- Ramaswamy, V -- Russell, G -- Schmidt, G A -- New York, N.Y. -- Science. 2005 Sep 2;309(5740):1551-6. Epub 2005 Aug 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. santer1@llnl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16099951" target="_blank"〉PubMed〈/a〉
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    Science and society. Smithsonian gives grudging ok to film backing ID argument (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bhattacharjee, Yudhijit -- New York, N.Y. -- Science. 2005 Jun 10;308(5728):1526.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15947141" target="_blank"〉PubMed〈/a〉
    Keywords: *Earth (Planet) ; *Evolution, Planetary ; *Motion Pictures as Topic ; *Museums ; Natural History ; Religion and Science ; *Science ; United States
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    Hanbury Brown Twiss effect for ultracold quantum gases (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-09-17
    Description: We have studied two-body correlations of atoms in an expanding cloud above and below the Bose-Einstein condensation threshold. The observed correlation function for a thermal cloud shows a bunching behavior, whereas the correlation is flat for a coherent sample. These quantum correlations are the atomic analog of the Hanbury Brown Twiss effect. We observed the effect in three dimensions and studied its dependence on cloud size.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schellekens, M -- Hoppeler, R -- Perrin, A -- Gomes, J Viana -- Boiron, D -- Aspect, A -- Westbrook, C I -- New York, N.Y. -- Science. 2005 Oct 28;310(5748):648-51. Epub 2005 Sep 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire Charles Fabry de l'Institut d'Optique, UMR 8501 du CNRS, Centre Scientifique d'Orsay, Batiment 503, 91403 Orsay CEDEX, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16166479" target="_blank"〉PubMed〈/a〉
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    American Astronomical Society meeting. A rocky landing for Deep Impact? (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Irion, Robert -- New York, N.Y. -- Science. 2005 Jun 17;308(5729):1735.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15961647" target="_blank"〉PubMed〈/a〉
    Keywords: *Ice ; *Meteoroids
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    Keys to Independence in the U.K. and Ireland (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-16
    Description: Funding bodies are coming to the aid of young scientists with a variety of programs aimed at helping them become independent investigators.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forde, Anne -- Pain, Elisabeth -- New York, N.Y. -- Science. 2005 Apr 15;308(5720):427-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15831761" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Mobility ; Education, Graduate ; *Faculty ; *Fellowships and Scholarships ; Great Britain ; Humans ; Ireland ; *Research Personnel ; *Research Support as Topic ; Universities
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    Academic politics. Boycott of Israeli universities overturned (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Inman, Mason -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1397.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15933174" target="_blank"〉PubMed〈/a〉
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    Ecology. Fish moved by warming waters (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Inman, Mason -- New York, N.Y. -- Science. 2005 May 13;308(5724):937.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15890852" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Climate ; *Ecosystem ; Environment ; Fisheries ; *Fishes ; North Sea ; Population Dynamics ; *Seawater ; Temperature
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    Neuroscience. Preventing Alzheimer's: a lifelong commitment? (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-08-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, Jean -- New York, N.Y. -- Science. 2005 Aug 5;309(5736):864-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16081709" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/physiology ; Alzheimer Disease/epidemiology/*prevention & control ; Animals ; Brain/physiology ; Education ; *Exercise ; Female ; Humans ; Life Style ; Male ; *Mental Processes
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    A pair of shelled eggs inside a female dinosaur (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-16
    Description: An oviraptosaurian specimen (Dinosauria, Theropoda) from an Upper Cretaceous formation in China retains a pair of shelled eggs in the pelvis, providing direct evidence that oviraptorosaurian dinosaurs laid paired elongatoolithid eggs. The presence of the paired eggs suggests that theropod dinosaurs had two functional oviducts (like crocodiles) but that each oviduct produced only one egg at a time and that an entire egg clutch was laid through multiple ovipositions (like birds). The orientations of the eggs inside the skeleton and in clutches indicate that the mother came to the center of the nest to lay eggs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sato, Tamaki -- Cheng, Yen-nien -- Wu, Xiao-chun -- Zelenitsky, Darla K -- Hsiao, Yu-fu -- New York, N.Y. -- Science. 2005 Apr 15;308(5720):375.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Canadian Museum of Nature (CMN), Post Office Box 3443, STN D, Ottawa, Ontario K1P 6P4, Canada. tsato@mus-nature.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15831749" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dinosaurs/anatomy & histology/*physiology ; *Egg Shell ; Female ; *Fossils ; Oviducts/anatomy & histology/physiology ; *Oviposition ; *Ovum
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    Recurrent fusion of TMPRSS2 and ETS transcription factor genes in prostate cancer (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-10-29
    Description: Recurrent chromosomal rearrangements have not been well characterized in common carcinomas. We used a bioinformatics approach to discover candidate oncogenic chromosomal aberrations on the basis of outlier gene expression. Two ETS transcription factors, ERG and ETV1, were identified as outliers in prostate cancer. We identified recurrent gene fusions of the 5' untranslated region of TMPRSS2 to ERG or ETV1 in prostate cancer tissues with outlier expression. By using fluorescence in situ hybridization, we demonstrated that 23 of 29 prostate cancer samples harbor rearrangements in ERG or ETV1. Cell line experiments suggest that the androgen-responsive promoter elements of TMPRSS2 mediate the overexpression of ETS family members in prostate cancer. These results have implications in the development of carcinomas and the molecular diagnosis and treatment of prostate cancer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tomlins, Scott A -- Rhodes, Daniel R -- Perner, Sven -- Dhanasekaran, Saravana M -- Mehra, Rohit -- Sun, Xiao-Wei -- Varambally, Sooryanarayana -- Cao, Xuhong -- Tchinda, Joelle -- Kuefer, Rainer -- Lee, Charles -- Montie, James E -- Shah, Rajal B -- Pienta, Kenneth J -- Rubin, Mark A -- Chinnaiyan, Arul M -- 5P30 CA46592/CA/NCI NIH HHS/ -- P50CA69568/CA/NCI NIH HHS/ -- R01 CA97063/CA/NCI NIH HHS/ -- R01AG21404/AG/NIA NIH HHS/ -- UO1 CA111275-01/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2005 Oct 28;310(5748):644-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of Michigan Medical School, 1301 Catherine Street, Ann Arbor, MI 48109-0602, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16254181" target="_blank"〉PubMed〈/a〉
    Keywords: Androgens/metabolism ; Cell Line, Tumor ; DNA-Binding Proteins/*genetics ; Gene Expression Regulation, Neoplastic ; Gene Rearrangement ; Humans ; In Situ Hybridization, Fluorescence ; Male ; Membrane Proteins/*genetics ; Molecular Sequence Data ; Neoplasm Proteins/*genetics ; Oncogene Proteins, Fusion/*genetics ; Polymerase Chain Reaction ; Prostatic Neoplasms/*genetics ; Serine Endopeptidases/*genetics ; Trans-Activators/*genetics ; Transcription Factors/*genetics ; Translocation, Genetic
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    AtmospheRIC science. Tipping points in the tundra (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-10-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Foley, Jonathan A -- New York, N.Y. -- Science. 2005 Oct 28;310(5748):627-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Sustainability and the Global Environment (SAGE), Nelson Institute for Environmental Studies, University of Wisconsin, Madison, WI 53726, USA. jfoley@wisc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16254174" target="_blank"〉PubMed〈/a〉
    Keywords: Arctic Regions ; *Greenhouse Effect ; Models, Theoretical ; Trees
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    Scientific misconduct. Researcher faces prison for fraud in NIH grant applications and papers (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kintisch, Eli -- New York, N.Y. -- Science. 2005 Mar 25;307(5717):1851.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15790813" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Energy Metabolism ; Female ; Fraud ; History, 20th Century ; History, 21st Century ; Humans ; Menopause ; *National Institutes of Health (U.S.) ; *Publishing ; *Research Support as Topic ; Retraction of Publication as Topic ; *Scientific Misconduct ; United States
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    Genetics. Two genes link two distinct psychoses (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sawa, Akira -- Snyder, Solomon H -- New York, N.Y. -- Science. 2005 Nov 18;310(5751):1128-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA. asawa1@jhmi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16293746" target="_blank"〉PubMed〈/a〉
    Keywords: 3',5'-Cyclic-AMP Phosphodiesterases/*genetics/physiology ; Affective Disorders, Psychotic/enzymology/*genetics ; Carrier Proteins/physiology ; Cyclic AMP/metabolism ; Cyclic Nucleotide Phosphodiesterases, Type 4 ; Enzyme Activation ; Humans ; Mutation ; Nerve Tissue Proteins/*genetics/physiology ; Protein Binding ; Schizophrenia/*genetics ; Signal Transduction ; Translocation, Genetic
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    Virology. Chemokine gene number tied to HIV susceptibility, but with a twist (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-01-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Jon -- New York, N.Y. -- Science. 2005 Jan 7;307(5706):23-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15637239" target="_blank"〉PubMed〈/a〉
    Keywords: African Continental Ancestry Group/genetics ; Chemokines, CC/*genetics ; European Continental Ancestry Group/genetics ; *Gene Dosage ; Gene Duplication ; *Genetic Predisposition to Disease ; HIV Infections/*genetics ; Humans
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    Global consequences of land use (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-07-26
    Description: Land use has generally been considered a local environmental issue, but it is becoming a force of global importance. Worldwide changes to forests, farmlands, waterways, and air are being driven by the need to provide food, fiber, water, and shelter to more than six billion people. Global croplands, pastures, plantations, and urban areas have expanded in recent decades, accompanied by large increases in energy, water, and fertilizer consumption, along with considerable losses of biodiversity. Such changes in land use have enabled humans to appropriate an increasing share of the planet's resources, but they also potentially undermine the capacity of ecosystems to sustain food production, maintain freshwater and forest resources, regulate climate and air quality, and ameliorate infectious diseases. We face the challenge of managing trade-offs between immediate human needs and maintaining the capacity of the biosphere to provide goods and services in the long term.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Foley, Jonathan A -- Defries, Ruth -- Asner, Gregory P -- Barford, Carol -- Bonan, Gordon -- Carpenter, Stephen R -- Chapin, F Stuart -- Coe, Michael T -- Daily, Gretchen C -- Gibbs, Holly K -- Helkowski, Joseph H -- Holloway, Tracey -- Howard, Erica A -- Kucharik, Christopher J -- Monfreda, Chad -- Patz, Jonathan A -- Prentice, I Colin -- Ramankutty, Navin -- Snyder, Peter K -- New York, N.Y. -- Science. 2005 Jul 22;309(5734):570-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Sustainability and the Global Environment (SAGE), University of Wisconsin, 1710 University Avenue, Madison, WI 53726, USA. jfoley@wisc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16040698" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; Air Pollution ; Animals ; Animals, Wild ; Climate ; Communicable Diseases/epidemiology/transmission ; *Conservation of Natural Resources ; *Ecosystem ; *Environment ; Fresh Water ; Human Activities ; Humans ; Policy Making ; Trees
    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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    A microbial arsenic cycle in a salt-saturated, extreme environment (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-28
    Description: Searles Lake is a salt-saturated, alkaline brine unusually rich in the toxic element arsenic. Arsenic speciation changed from arsenate [As(V)] to arsenite [As(III)] with sediment depth. Incubated anoxic sediment slurries displayed dissimilatory As(V)-reductase activity that was markedly stimulated by H2 or sulfide, whereas aerobic slurries had rapid As(III)-oxidase activity. An anaerobic, extremely haloalkaliphilic bacterium was isolated from the sediment that grew via As(V) respiration, using either lactate or sulfide as its electron donor. Hence, a full biogeochemical cycle of arsenic occurs in Searles Lake, driven in part by inorganic electron donors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oremland, Ronald S -- Kulp, Thomas R -- Blum, Jodi Switzer -- Hoeft, Shelley E -- Baesman, Shaun -- Miller, Laurence G -- Stolz, John F -- New York, N.Y. -- Science. 2005 May 27;308(5726):1305-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey, ms 480, 345 Middlefield Road, Menlo Park, CA 94025, USA. roremlan@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15919992" target="_blank"〉PubMed〈/a〉
    Keywords: Aerobiosis ; Anaerobiosis ; Arsenates/*metabolism ; Arsenites/*metabolism ; Bacteria, Anaerobic/classification/growth & development/*isolation & ; purification/*metabolism ; Bicarbonates/metabolism ; California ; Ecosystem ; Electron Transport ; Genes, rRNA ; Geologic Sediments/*microbiology ; Hydrogen-Ion Concentration ; Lactic Acid/metabolism ; Molecular Sequence Data ; Oxidation-Reduction ; Phylogeny ; *Salts ; Sodium Chloride ; Sulfides/metabolism ; Water/chemistry ; *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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