Filters: partyWithName: Elsevier Science (X)301 results (105ms)
The volcanic islands making up the Azores Archipelago rise above sea from a prominent submarine topographic high (the “Azores Plateau”), marked by the 2000-m bathymetric contour. Specifically, the Azores Islands lie at the so-called “Azores Triple Junction” (ATJ), where the Eurasian, North American, and African (or Nubian) tectonic plates meet. In general terms, the ATJ is defined by the Mid-Atlantic Ridge (MAR) separating the North American plate from the other two, and the Azores–Gibraltar fault zone separating the Eurasian and African plates. In addition, the existence of a mantle plume (“hotspot) beneath Azores Plateau has been inferred in many previous investigations. Not surprisingly, because of its distinctive...
Categories: Publication; Types: Citation; Tags: Acer rubrum, Black gum, Black tupelo, Chestnut oak, D 04001 Methodology - general,
Proximal-distal facies relationships and sedimentary processes in a storm dominated carbonate ramp (Kimmeridgian, northwest of the Iberian Ranges, Spain)
Categories: Publication; Types: Citation; Tags: ASFA 2: Ocean Technology Policy & Non-Living Resources, Carbonates, Facies, Q2 02264 Sediments and sedimentation, Sedimentary environments,
Gap dynamics in Allegheny northern hardwood forests in the presence of beech bark disease and gypsy moth disturbances
Categories: Publication; Types: Citation; Tags: D 04700 Management; Z 05203 Relations to plants, Defoliation, Ecology Abstracts; Entomology Abstracts, Forest management, Gaps,
Categories: Publication; Types: Citation; Tags: Adsorption, Agricultural Chemicals, Aluminum, Application Rates, Chemical Analysis,
Late Holocene sediment in Nara Inlet, central Great Barrier Reef platform, Australia: sediment accumulation on the middle shelf of a tropical mixed clastic/carbonate system
Categories: Publication; Types: Citation; Tags: ASFA 2: Ocean Technology Policy & Non-Living Resources; Ocea, Carbonate sediments, Continental shelves, Coral reefs, Fossil Foraminifera,
Categories: Publication; Types: Citation; Tags: Agriculture, Economic Aspects, Erosion, Erosion Control, Flood Plain Management,
Grasstrees reveal contrasting fire regimes in eucalypt forest before and after European settlement of southwestern Australia
Categories: Publication; Types: Citation; Tags: Australia, Western Australia, D 04700 Management, Ecology Abstracts, European settlement, Fires,
Categories: Publication; Types: Citation; Tags: Adjuvants, Bile, Cytokines, DNA vaccines, F 06807 Active immunization,
Biomass burning in Indonesia and Papua New Guinea: natural and human induced fire events in the fossil record
Categories: Publication; Types: Citation; Tags: Biomass, Climatic changes, D 04680 Paleoecology; P 5000 LAND POLLUTION, Ecology Abstracts; Pollution Abstracts, Fires,
Categories: Publication; Types: Citation; Tags: Avian reovirus, Capsid protein, Cell lines, Growth rate, V 22023 Virus behavior in cell culture,
Special issue: The changing shapes of active volcanoes: Recent results and advances in volcano geodesy
The 18 papers herein report on new geodetic data that offer valuable insights into eruptive activity and magma transport; they present new models and modeling strategies that have the potential to greatly increase understanding of magmatic, hydrothermal, and volcano-tectonic processes; and they describe innovative techniques for collecting geodetic measurements from remote, poorly accessible, or hazardous volcanoes. To provide a proper context for these studies, we offer a short review of the evolution of volcano geodesy, as well as a case study that highlights recent advances in the field by comparing the geodetic response to recent eruptive episodes at Mount St. Helens. Finally, we point out a few areas that continue...
Crayfish (Orconectes spp.), Asian clam (Corbicula fluminea), northern hog sucker (hog sucker; Hypentelium nigricans), and smallmouth bass (smallmouth; Micropterus dolomieu) from streams in southeastern Missouri (USA) were analyzed for total mercury (HgT) and for stable isotopes of carbon (δ¹³C), nitrogen (δ¹⁵N), and sulfur (δ³⁴S) to discern Hg transfer pathways. HgT concentrations were generally lowest in crayfish (0.005-0.112 μg/g dw) and highest in smallmouth (0.093-4.041 μg/g dw), as was δ¹⁵N. HgT was also lower and δ¹⁵N was higher in all biota from a stream draining a more heavily populated historical lead-zinc mining area than from similar sites with mostly undeveloped forested watersheds. δ¹³C in biota was...
Categories: Publication; Types: Citation; Tags: Ecotoxicology and Environmental Safety
Sources of endocrine-disrupting compounds in North Carolina waterways: a geographic information systems approach
The presence of endocrine-disrupting compounds (EDCs), particularly estrogenic compounds, in the environment has drawn public attention across the globe, yet a clear understanding of the extent and distribution of estrogenic EDCs in surface waters and their relationship to potential sources is lacking. The objective of the present study was to identify and examine the potential input of estrogenic EDC sources in North Carolina water bodies using a geographic information system (GIS) mapping and analysis approach. Existing data from state and federal agencies were used to create point and nonpoint source maps depicting the cumulative contribution of potential sources of estrogenic EDCs to North Carolina surface waters....
Categories: Publication; Types: Citation; Tags: Environmental Toxicology and Chemistry
Accurate mass analysis of ethanesulfonic acid degradates of acetochlor and alachlor using high-performance liquid chromatography and time-of-flight mass spectrometry
Degradates of acetochlor and alachlor (ethanesulfonic acids, ESAs) were analyzed in both standards and in a groundwater sample using high-performance liquid chromatography-time-of-flight mass spectrometry with electrospray ionization. The negative pseudomolecular ion of the secondary amide of acetochlor ESA and alachlor ESA gave average masses of 256.0750+/-0.0049 amu and 270.0786+/-0.0064 amu respectively. Acetochlor and alachlor ESA gave similar masses of 314.1098+/-0.0061 amu and 314.1153+/-0.0048 amu; however, they could not be distinguished by accurate mass because they have the same empirical formula. On the other hand, they may be distinguished using positive-ion electrospray because of different fragmentation...
Categories: Publication; Types: Citation; Tags: Journal of Chromatography A
From September 1999 through April 2004, Shishaldin Volcano, Aleutian Islands, Alaska, exhibited a continuous and extremely high level of background seismicity. This activity consisted of many hundreds to thousands of long-period (LP; 1–2 Hz) earthquakes per day, recorded by a 6-station monitoring network around Shishaldin. The LP events originate beneath the summit at shallow depths (0–3 km). Volcano tectonic events and tremor have rarely been observed in the summit region. Such a high rate of LP events with no eruption suggests that a steady state process has been occurring ever since Shishaldin last erupted in April–May 1999. Following the eruption, the only other signs of volcanic unrest have been occasional...
Submarine alkalic and transitional basalts collected by submersible along Kilauea volcano's south flank represent early eruptive products from Earth's most active volcano. Strongly alkalic basalt fragments sampled from volcaniclastic deposits below the mid-slope Hilina Bench yield 40Ar/39Ar ages from 212±38 to 280±20 ka. These ages are similar to high-precision 234±9 and 239±10 ka phlogopite ages from nephelinite clasts in the same deposits. Above the mid-slope bench, two intact alkalic to transitional pillow lava sequences protrude through the younger sediment apron. Samples collected from a weakly alkalic basalt section yield 138±30 to 166±26 ka ages and others from a transitional basalt section yield 138±115...
Categories: Publication; Types: Citation; Tags: ASFA 1: Biological Sciences & Living Resources; Water Resour, Aquatic insects, Biogenic sedimentary structures, Caddisflies, Caddisflies,
Categories: Publication; Types: Citation; Tags: Agriculture, Cotton, Crop Yield, Evapotranspiration, Irrigation Water,