• Chemical separation and MC-ICPMS analysis of U, Th, Pa and Ra isotope ratios of carbonates. (uni-mainz.de)
  • Furthermore we had a look at the variability of the annual data after 1950 (the time span of the "native SPEI") and before this year, the time span of the reconstruction of the "European hydroclimate based on a network of tree-ring stable isotopes of oxygen and carbon ratios" in MBF23. (judithcurry.com)
  • This will be achieved by collecting specimens of the planktic foraminifera Globigerinoides ruber and analysing the stable oxygen isotope ratios contained within their calcium carbonate tests (shells). (data.gov.uk)
  • Oxygen isotope ratios provide information about the global ice volume and global climate, and the standard record can be identified world-wide. (data.gov.uk)
  • Analyses of stable oxygen and carbon isotope ratios were used to test the hypothesis that there was a severe drought and related change in human diet in ancient Peru ca. 1100 C.E. Previous studies of ice cores from the Andes and paleobotanical studies of food refuse suggest that the change in climate had a major impact on human food consumption patterns. (youngscientistjournal.org)
  • Changes in carbon isotope ratios reveal changes in plant foods consumed. (youngscientistjournal.org)
  • In addition, Stonehenge lies on the Wessex chalk, characterized by a well-constrained range of strontium isotope ratios (±2 SD: 0.7074-0.7090) allowing for the identification of individuals consuming food beyond this landscape. (sarsen.org)
  • In addition, 17 radioactive isotopes have been discovered, ranging from 15 Ne to 34 Ne , all short-lived. (wikipedia.org)
  • Alpha particle ( ionizing radiation ) - two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. (cdc.gov)
  • Beta particle ( ionizing radiation ) - a charged particle emitted from the nucleus of certain unstable atomic nuclei (radioactive isotopes), having the charge and mass of an electron. (cdc.gov)
  • We examined the natural variability of carbon and nitrogen isotopes in the symbiotic sea anemone Anemonia viridis to investigate dietary shifts (autotrophy/heterotrophy) along a natural p CO 2 gradient at the island of Vulcano, Italy. (nature.com)
  • The characterization of Neandertals' diets has mostly relied on nitrogen isotope analyses of bone and tooth collagen. (mpg.de)
  • However, few nitrogen isotope data have been recovered from bones or teeth from Iberia due to poor collagen preservation at Paleolithic sites in the region. (mpg.de)
  • Specific nutrients are Carbon, Nitrogen, Phosphorus and. (ucar.edu)
  • This dataset contains data for stable carbon and nitrogen isotope values of particulate organic matter (POM) collected from the Conductivity Temperature Depth (CTD) rosette. (ucar.edu)
  • The on the quantitative level of NP biodistribution, an analysis aerosol was diluted with nitrogen and--for rat exposures-- is required taking into account NP retention in the entire with oxygen adjusted to obtain 20% oxygen and the synthetic organism as well as the excretion. (cdc.gov)
  • Here, we present the results of zinc (Zn), strontium (Sr), carbon (C), and oxygen (O) isotope and trace element ratio analysis measured in dental enamel on a Pleistocene food web in Gabasa, Spain, to characterize the diet and ecology of a Middle Paleolithic Neandertal individual. (mpg.de)
  • The practice of cremation has, however, precluded the application of strontium isotope analysis of tooth enamel as the standard chemical approach to study their origin. (sarsen.org)
  • It uses the method of "stable isotope analyses C13/O18" to extend the " Standardised Precipitation-Evapotranspiration Index (SPEI) from 1950 to now back to 1600. (judithcurry.com)
  • ISOLUTION 1.0: an ISOtope evoLUTION model describing the stable oxygen (d 18 O) and carbon (d 13 C) isotope values of speleothems. (uni-mainz.de)
  • The SISAL database: a global resource to document oxygen and carbon isotope records from speleothems. (uni-mainz.de)
  • The SISAL database contains oxygen and carbon isotope data from speleothems worldwide. (ipsl.fr)
  • Based on the extremely low δ66Zn value observed in the Neandertal's tooth enamel, our results support the interpretation of Neandertals as carnivores as already suggested by δ15N isotope values of specimens from other regions. (mpg.de)
  • Simulating speleothem growth in the laboratory: Determination of the stable isotope fractionation (d 13 C and d 18 O) between H 2 O, DIC and CaCO 3 . (uni-mainz.de)
  • Site-specific natural isotope fractionation by NMR. (chipsbooks.com)
  • This will assist in constructing the low resolution stable isotope and biostratigraphic framework for the remainder of this Hole. (data.gov.uk)
  • In this study we assess the integrated biostratigraphic and chemostratigraphic framework for the Ordovician sequence at Lanna, utilizing trilobites and conodonts coupled with bulk-rock carbon and oxygen isotopes (δ 13 C carb and δ 18 O carb ). (lu.se)
  • We have addressed this deficit by generating new high-resolution biostratigraphic, stable isotope, and X-ray fluorescence (XRF) records spanning the MECO interval ( ∼38.0 -43.0 Ma) in two holes drilled at Site 865. (copernicus.org)
  • This dataset contains rosette bottle data from the U.S. Coast Guard Cutter Healy 09-01 cruise in March 2009, including salinity, temperature, macronutrients and stable oxygen. (ucar.edu)
  • The dataset contains 15 plots and data for time-dependent pressures and temperatures at various locations along a 2582-m-long well and at various simulation times. (nerc.ac.uk)
  • We will analyse the upper 7 m of Hole U1396C, at low resolution, for stable oxygen isotopes of the benthic foraminifera Cibicidoides spp. (data.gov.uk)
  • and for planktic foraminifera datum species. (data.gov.uk)
  • Planktic foraminifera stable carbon and oxygen isotope records of IODP Hole 3. (eudat.eu)
  • Carbon and oxygen isotopic composition of planktic foraminifera spanning the early and middle Eocene succession recovered from borehole 16/28-Sb01. (nerc.ac.uk)
  • Extrinsic sources of carbon for the host include zooplankton and particulate organic carbon (POC) 17 . (nature.com)
  • The updated biosphere map for the UK will allow users to identify sulphur isotope variations. (bgs.ac.uk)
  • A vigorous assessment of CAS preservation using sulfate oxygen, carbonate carbon and oxygen isotopes and trace element data, suggests factors affecting preservation of primary seawater CAS isotopes in ancient biogenic samples are complex, and not necessarily linked to the preservation of original carbonate mineralogy or chemistry. (nerc.ac.uk)
  • Constraints for precise and accurate fluid inclusion stable isotope analysis using water-vapour saturated CRDS techniques. (uni-heidelberg.de)
  • This study inves-tigates the effectiveness of using stable isotope analysis, a method for testing the anatomical make-up of ancient samples, to address questions arising from the analysis of ancient artifacts and skeletons, and test the idea that climate change (i.e., a severe drought) contributed to significant changes in agricultural pro-duction and thus, food consumption and nutritional status among prehispanic peoples in the Andes. (youngscientistjournal.org)
  • The total number of citations at the time of data analysis was 21,109, with an average of 12.3 citations per each documents and median (interquartile range) of 4 (1-14). (who.int)
  • In the analysis of the data elaborate Doppler corrections routines have been developed using both the segmentation of the CLARION detectors and the total energy deposited in the ion chamber. (lu.se)
  • These data are suspended particulate nutrient concentrations on the following cruises: HLY0903, KN195, TN249, TN250. (ucar.edu)
  • Late Pleistocene and Holocene groundwater flow history in the Baltic Artesian Basin: a synthesis of numerical models and hydrogeochemical data. (uni-heidelberg.de)
  • To show that also the claim in the Abstract ("2015-2018 highly unusual") is not true we had a deeper look in the data and calculated those 4 years averages over the whole timespan. (judithcurry.com)
  • METHODS: Data were searched for documents with specific words regarding paracetamol poisoning as 'keywords' in the title or/and abstract. (who.int)
  • Separating isotopic impacts of karst and in-cave processes from climate variability using an integrated speleothem isotope-enabled forward model. (uni-mainz.de)
  • During the early Paleocene (magnetochron C29R) a prominent negative excursion in seawater δ34S of 3-4‰ suggests that a global decline in organic carbon burial related to collapse in export productivity, also impacted the sulfur cycle via a significant drop in pyrite burial. (nerc.ac.uk)
  • The ratio of stable oxygen isotopes ( 18 O/ 16 O) and carbon isotopes ( 13 C/ 12 C) were obtained from the hydroxyapatite in dental enamel from human re-mains excavated from archaeology sites in the Peruvian Andes. (youngscientistjournal.org)
  • If there are significant changes in the oxygen isotope ratio ( 18 O/ 16 O) and carbon isotope ratio ( 13 C/ 12 C), reported as 18 O and 13 C values, from one period to the next, then this would suggest changes in precipitation levels and changes in food production and consumption. (youngscientistjournal.org)
  • Coupling these data with other climate proxies increases the accuracy and precision of paleoclimate interpretations ( Fairchild and Baker, 2012 ). (geoscienceworld.org)
  • Previous stable isotope studies have shown that changes in stable oxygen ra-tios indicate ancient climate changes, specifically as it relates to rainfall: a less negative 18 O value indicates less rainfall and a more negative value indicates more rainfall, with some exceptions that relate to distance from equator, alti-tude, and contributions from glacial melt water [1]. (youngscientistjournal.org)
  • Increasing carbon dioxide (CO 2 ) emissions drive ongoing ocean acidification (OA) and place marine ecosystems in a vulnerable state 1 . (nature.com)
  • The car port is expected to provide a significant proportion of the energy needs for the site for at least 25 years, significantly reducing carbon dioxide (CO 2 ) emissions. (bgs.ac.uk)
  • Speleothem paleoenvironmental proxy records focus on stable oxygen and carbon isotope time series (δ 18 O and δ 13 C, respectively) (e.g. (geoscienceworld.org)
  • This dataset includes all records on euphausiid measured lengths and their subsequent conversions to wet, dry, carbon and nitrogene weights. (ucar.edu)
  • The new high-resolution δ 13 C and δ 18 O data are broadly consistent with other chemostratigraphic records at the regional scale, but notable differences in δ 13 C are obvious compared to global records. (lu.se)
  • Geochronology - Established dating techniques will be used tconstrain the chronology and tie in biostratigraphical models with the independent marine isotope and polar ice core records. (ahobproject.org)
  • Zinc isotopes have been shown to be a reliable method for reconstructing trophic levels in the absence of organic matter preservation. (mpg.de)
  • Together with a decrease in the difference between δ 13 C values of both fractions at the higher p CO 2 sites, these results indicate there is a greater net autotrophic input to the A. viridis carbon budget under high p CO 2 conditions. (nature.com)
  • Recovery of the sulfur cycle to pre-extinction values occurs at the same time (∼320 kyrs) as initial carbon cycle recovery globally. (nerc.ac.uk)
  • Values are a composite of data previously reported by Shackleton et al. (eudat.eu)
  • Differences in carbon isotope values stem from the complexity of pathways adapted by plants to obtain oxygen and nutrients from the environment. (youngscientistjournal.org)
  • Text data capturing pore fluid pressures (upstream and downstream), axial stress, axial and radial displacement were conditioned and logged by a high-speed data acquisition unit (NI-DAQ 6341) recording data at 10kHz. (nerc.ac.uk)
  • This project is fundamentally a multidisciplinary approach towards integrating known archaeological and environmental data with the Quaternary chronostratigraphical framework. (ahobproject.org)
  • r\n\r\nOur new model investigations provide a framework that can be applied at other Transantarctic outlet glaciers where geochronological data are available. (usap-dc.org)
  • The use of laser ablation sampling for , H and C isotopes allows very high resolution in sampling and it should be possible tderive seasonal climatic reconstructions. (ahobproject.org)
  • In the locations where geochronological data are available we can use these data as direct constraints on ice-flow models that simulate ice elevation change over time. (usap-dc.org)
  • Using these data and available geochronological constraints we investigated Beardmore Glacier evolution since the Last Glacial Maximum using simplified (flowline) models of ice flow. (usap-dc.org)
  • In these simulations we can evaluate the past accumulation, ice influx, and ice outflux to compare controls on deglaciation to data constraints on the chronology of deglaciation. (usap-dc.org)
  • The isotopic data from this study were compared to other isotopic datasets from the Andes to examine general trends in precipitation and its relation-ship to food production and consumption. (youngscientistjournal.org)
  • In particular, emphasis is given to a wide spectrum of isotope data (δ 18 O, δ 2 H, δ 13 C, δ 15 N, δ 34 S, 87 Sr/ 86 Sr, δ 11 B), which is considered useful for determining water origin as well as natural and anthropogenic impacts on riverine geochemistry. (ufz.de)
  • Water isotopes (δ¹⁸O) of firn core RID-75 from Roosevelt Island drilled in au. (eudat.eu)
  • CP chann el.10±12 Most or all of these water mol- data, show that they are smaller than previously ecules are likely to be involved directly in the pro- thought. (lu.se)
  • The purpose of this paper is to investigate dietary changes of A. viridis using isotopic compositions, particularly carbon source shifts in the anemone metabolism, in response to high p CO 2 /low pH conditions in situ . (nature.com)
  • These data represent the highest resolution seawater sulfate record ever generated for this time interval, and are broadly in agreement with previous low-resolution estimates for the latest Cretaceous and Paleocene. (nerc.ac.uk)
  • Data include a set of elastic wave first arrival times, obtained from time of flight measurements using an array of piezoelectric transducers and the cross-correlation method detailed in Brantut (2015) (see reference above). (nerc.ac.uk)
  • In all the data files, the first column corresponds to a common time basis, in seconds. (nerc.ac.uk)
  • From the MRD data, the rotational correlation time of detergent-solubilized BR was determined to 35 ns at 300 K, con- sistent with a monomeric protein in complex with about 150 detergent molecules. (lu.se)
  • Quantitative data on past conditions will be determined by the use of transfer functions derived from isotopic determinations of materials from analogous modern systems. (ahobproject.org)
  • We performed NP inhalation studies with rats to derive quantitative biodistribution data on the translocation of NP from lungs to blood circulation and STOs. (cdc.gov)
  • We report new carbonate associated sulfate (CAS) sulfur isotope data derived from marine macrofossil shell material from a highly expanded high latitude Maastrichtian to Danian (69-65.5 Ma) succession located on Seymour Island, Antarctica. (nerc.ac.uk)
  • This Conductivity Temperature Depth (CTD) data set, consisting of 210 casts, was collected during a multi-disciplinary Bering Sea ice cruise on the US Coast Guard Cutter Healy. (ucar.edu)
  • The Cretaceous-Paleogene (K-Pg) mass extinction event 66 million years ago led to large changes to the global carbon cycle, primarily via a decrease in primary or export productivity of the oceans. (nerc.ac.uk)
  • Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS). (wikipedia.org)
  • Six different scenarios are considered: three different injection durations (linear ramp-up of the inlet mass flow rate from 0 to 33.5 kg/s over 5 minutes, 30 minutes, and 2 hours) and two different upstream temperatures (278.15 K and 283.15 K). Data is currently restricted until publication. (nerc.ac.uk)
  • The intellectual merit of this work is using ice-flow models to spatially and temporally extrapolate between these limited geochronological data points, which enables new understanding of glacier evolution. (usap-dc.org)
  • Since the topography of the glacier bed is an important control on ice flow and is a necessary boundary condition in models we developed a new gridded bed product at Beardmore Glacier, the one location where sufficient data were available, and we compared this to continent-scale gridded bed products. (usap-dc.org)
  • The work forms part of BGS's new environmental sustainability strategy, which aims to achieve zero carbon by 2040 across three core areas of the organisation: its estates, working practices and business travel. (bgs.ac.uk)
  • BGS provides independent geoscientific data, information and knowledge to help the UK manage its natural resources and respond to environmental change. (bgs.ac.uk)
  • Background radioactivity - radioactive elements in the natural environment including those in the crust of the earth (like radioactive potassium, uranium, and thorium isotopes) and those produced by cosmic rays. (cdc.gov)
  • This, in turn, suggests that sea level played a larger role than long-term changes within the global carbon cycle for regulating local-regional δ 13 C gradients in the Middle Ordovician. (lu.se)
  • Annual European mean SPEI-data in blue/red, the low pass filter output is shown in black. (judithcurry.com)
  • our limited evaluation suggests that the BedMachine product may be sufficient at other Transantarctic outlets where bed measurements are not available, but that other compilations of bed topography data that do not include information about ice flow directions do not provide reliable results. (usap-dc.org)
  • The inhaled NP were chain aggregates (and agglomerates) of either iridium or carbon, with primary particle sizes of 2-4 nm (Ir) and 5-10 nm (C) and aggregate sizes (mean mobility diameters) between 20 and 80 nm. (cdc.gov)
  • Taphonomy and palaeoecology - information derived from the post-mortem history of biological materials can provide a wealth of environmental data. (ahobproject.org)