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424 results for “14C”
Pelagic, epilimnetic production estimates in Sparkling, Trout (Wisconsin), Acton (Ohio), and Castle (California) Lakes (USA) calculated using 14C and free-water O2 metabolism methods, 2007 - 2017
Concurrent daily estimates of pelagic, eplilimnetic production (mmol C m3 d) generated from 14C incubations and diel changes in high frequency dissolved oxygen data (free-water). Original data derived from the North Temperate Lakes Long Term Ecological Research program (Sparkling [2007-2013], Trout [2007-2012] Lakes), Castle Lake Research Station (Castle Lake [2014-2017]), and Center for Aquatic and Watershed Sciences (Acton Lake [2010-2014]). 14C production estimates were generated as part of each research programs core data collection. Free-water production estimates generated using high frequency sensor data provided by research programs and Phillips (2020) time-varying, Bayesian metabolism model.
Total dissolved nitrogen (TDN), dissolved organic carbon (DOC), radiocarbon (14C-DOC), and stable carbon (13C-DOC) of surface waters from the Canning River watershed, 2019 and 2021
Sites along the Canning River mainstem and contributing streams near the Kavik River Camp, Alaska, were visited to track changes in stream and river total dissolved nitrogen (TDN) concentration, dissolved organic carbon (DOC) concentration, and the stable carbon (13C) and radiocarbon (14C) isotopic composition of DOC across transitions between the Brooks Range, Brooks foothills, and Arctic Coastal Plain. The dataset also includes water samples collected from lakes, springs, groundwater, and streams and rivers outside the Canning River watershed. Water samples were collected in late April and early August 2019 and in late July and early August 2021. Data include measurements of individual samples for TDN (milligrams nitrogen per liter), DOC (milligrams carbon per liter), carbon-13 of DOC (reported as delta-13C, per mil), carbon-14 of DOC (reported as fraction modern), and analytical error in the fraction modern values. Additional water chemistry data for these samples can be found in Koch et al. (2024). References: Koch, J. C., Connolly, C. T., Repasch, M., Best, H. R., Couvillion, C. S., Hunt, A. (2024). [Dataset] Hydrochemistry and age date tracers from springs, streams, and rivers in the Arctic National Wildlife Refuge, 2019-2022, U.S. Geological Survey data release, https://doi.org/10.5066/P95CXJIT.
Ramped Pyrolysis Oxidation (RPO) coupled radiocarbon (14C-DOC) and stable carbon (13C-DOC), high-resolution molecular composition (FT-ICR MS), and biodegradable dissolved organic carbon (BDOC) of groundwater, river water, and lagoon water in northeast Alaska, 2017
Supra-permafrost groundwater (SPGW), river water, and lagoon water were sampled near Kaktovik, AK to assess the reactivity and origin of dissolved organic matter (DOM) across interconnected hydrologic systems during late summer. Water samples were collected on August 17th 2017 from SPGW along the beach of Jago Lagoon (Jago GW), surface water from the Jago River’s main channel above tidal influence (Jago R), and from the water column of Kaktovik Lagoon at 2–3 m depth (KA LW). Measurements were made from grab samples for river and lagoon water, and from a composite sample for SPGW gathered from 10 individual shoreline locations. Data include dissolved organic carbon concentration (DOC, mg C L-1), Ramped Pyrolysis Oxidation (RPO) derived fraction compositions of 13C-DOC (δ13C ‰), 14C-DOC (in fraction modern), and method/instrumental error in the 14C and 13C results, and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) molecular composition and summarized compound classes. Biodegradable DOC (BDOC) bottle experiments were performed using all three sample types, where DOC concentration was subsequently measured at 2, 7, 14, and 28 days. FT-ICR MS composition was subsequently measured at the 28-day timepoint to track changes in molecular formulae and compound class relative abundance following biodegradation. Data from RPO serial thermal oxidation include temperature and normalized CO2 profiles for each background sample. Thermal-oxidation profiles of CO2 were transformed into non-parametric activation energy (E) distributions using an inverse model. Model output includes C mass of oxidized CO2 (µg C), Tmax (K), Emax (kJ mol-1), Emean (kJ mol-1), Estd (kJ mol-1), and p(0,E)max of user-defined sample fractions. FT-ICR MS results include a summary table of the relative abundance of compound classes (e.g., unsaturated phenolic, polyphenolic, aliphatic, condensed aromatics, peptide-like) and elemental groupings (e.g., CHO-type, CHON-type, CHOS-type, CHON
Flintbek - Merkmalsaufnahmen Bernstein, Keramik und Steinartefakte und 14C-Daten
<p>Metadaten <br> zu den Merkmalsaufnahmen von Bernsteinfunden, Keramikfunden und Steinartefaktfunden in <br> Flintbek, Kr. Rendsburg-Eckernförde, Schleswig-Holstein sowie Liste der 14C-Daten</p> <p>1. Allgemeine Informationen: Urheber, Publikation, Fundplätze, Daten<br> 2. Bernstein<br> 3. Keramik <br> 4. Steinartefakte<br> 5. 14C-Daten</p> <p>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </p> <p><br> Mischka, Doris. (2020). <br> Flintbek - Merkmalsaufnahmen Bernstein, Keramik und Steinartefakte (Version 0.1) [Data set]. <br> Zenodo. http://doi.org/10.5281/zenodo.4395693</p> <p>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </p> <p>Urheber:<br> Doris Mischka, Das Neolithikum in Flintbek, Kr. Rendsburg-Eckernförde, Schleswig-Holstein – <br> Eine feinchronologische Studie zur Besiedlungsgeschichte einer Siedlungskammer anhand von Gräbern, ungedruckte Habilitationsschrift Kiel 2011.</p> <p>Publikation:<br> D. Mischka, Das Neolithikum in Flintbek, Kr. Rendsburg-Eckernförde, Schleswig-Holstein. <br> Eine feinchronologische Studie zur Besiedlungsgeschichte anhand von Gräbern. <br> Frühe Monumentalität und soziale Differenzierung 20 (Bonn 2022).<br> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </p> <p>Kontakt: <br> D. Mischka<br> Institut für Ur- und Frühgeschichte<br> der FAU Erlangen-Nürnberg<br> Kochstr. 4/18<br> 91054 Erlangen<br> Email: doris.mischka@fau.de<br> Telefon: 0049 (0) 9131-85-22408</p> <p>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </p> <p>Zu den Fundplätzen:<br> Fundplätze mit neolithischen Befunden und Funden<br> Flintbek LA 1, 3-7, 11, 17/171, 18, 20, 22, 35, 37-38, 40, 44, 48-49, 52-53, 56-58, 107, 108, 137, 143, 167 </p> <p>Befunde: zumeist Gräber, nichtmegalithische und megalithische<br> Trichterbecherkultur (gesamt)</p>
Primary production estimates from 14C uptake (in situ), determined by the incorporation of inorganic carbon into particulate organic carbon (POC) due to photosynthesis at selected light levels from CCE LTER process cruises in the California Current System, 2006 - 2021 (ongoing).
Primary productivity samples of seawater are taken each day shortly before noon on the CTD rosette up-cast during the CCE Process crusies (since 2006, ongoing). Light penetration below the surface is estimated from the Secchi disk depth. Niskin bottles from depths with ambient light intensities corresponding to light levels simulated by on-deck incubators are identified and sampled. Primary production is estimated from 14C uptake using this simulated in situ technique (followed by filtering) by which the assimilation of dissolved inorganic carbon by phytoplankton yields a measure (in µg/L/day) of the rate of photosynthetic primary production (particulate organic carbon, POC) at selected light levels in the euphotic zone within the CCE study area.
Dispilio. Supplementary Information for Maczkowski et al., Absolute dating of the European Neolithic using the 5259 BC rapid 14C excursion
<p>Supplementary Material for the paper "Absolute dating of the European Neolithic using the 5259 BC rapid 14C excursion":</p> <p> </p> <p><strong>Supplementary Information</strong> includes OxCal code, wiggle-matching output, photographs of the Neolithic juniper wood samples analysed, photographs of the tree-ring sampling for annual radiocarbon, photographs of modern tree-ring analogues, supplementary text on the data presented in the article, as well as the tree-ring width measurements in Heidelberg format (.fh).</p> <p><strong>Supplementary Data 1-2 </strong>includes spreadsheets with all the new raw radiocarbon data presented in the article, the associated uncertainties and ring numbers.</p> <p><strong>Supplementary Data 3</strong> includes the R code and the source data used for the generation of Figures 3 and 5 in the main article text, as well as the OxCal code used for the wiggle-matching of annual 14C in OxCal as presented in Fiugre 5</p> <p>The latest version of the Supplementary Material is just an expanded version of the first, files have been renamed according to editorial guidlines, few extra figures, OxCal code, and extra information added after the review process. No changes were made to any of the data published online in the initial version of the Supplementary Material.</p> <p> </p> <p>File renaming from last version:</p> <p>Supplementary Material = Supplementary Information</p> <p>Supplementary Material S1 = Supplementary Note 1</p> <p>Supplementary Material S2 = Supplementary Figures</p> <p>Supplementary Material S3 = Supplementary Note 2</p> <p>Supplementary Table T1 = Supplementary Data 1-2</p> <p>Supplementary Material S4 = Supplementary Data 3</p> <p> </p>
Dissolved and gaseous 14C from experimental plots near Toolik Lake, AK from 2005
This file contains the Specific Activity of 14C from dissolved and gaseous species of carbon sampled from tussock tundra and wet sedge plots near Toolik Lake, AK during the summer of 2005.
14C Uptake by Arctic Tussock Tundra Vegetation from 2002-2006
This file contains the 14C content of tussock tundra vegetation from 2002-2006. The 14C labeling occurred the summer of 2002.
14C Uptake by Arctic Wet Sedge Vegetation from 2002-2005
This file contains the 14C content of tussock tundra vegetation from 2002-2005. The 14C labeling occurred the summer of 2002.
Gradients2-MGL1704-14C-NPP_2020-03-25_v1.0
<p>Cruise: Gradients 2, MGL1704</p> <p>Project Name: Simons Foundation, Gradients NPSG</p> <p>Description:</p> <p>Standard HOT protocols were used to measure in vitro primary productivity (PP) via the 14C radiotracer method [Karl et al., 1996]. Water samples were collected from 15m before dawn and incubated on deck in incubators screened to ~50% of surface irradiance and plumbed with flow through surface seawater for temperature regulation. Duplicate 500-ml bottles were incubated in the incubator for ~12hr and 24hr, light bottles were paired with dark bottles. A time zero sample was taken at each station to ensure acidification was complete. Following dawn to dusk or dawn to dawn incubations, each sample was filtered onto a 25mm glass fiber filter. Filters were acidified with 1 ml of 2N hydrochloric acid in a fume hood for 12 hr to remove inorganic 14C after which 10 ml of Ultima Gold scintillation fluid was added to each sample. Radioactivity was determined using a Perkins Elmer 2600 liquid scintillation counter. The rate of PP was calculated by multiplying the percent of carbon labeled by the total carbon available for photosynthesis (e.g. dissolved inorganic carbon, DIC, calculated from SST and salinity measured at each station as per Lee et al. [2006]) and dividing by incubation time (t = 1 day). Rate measurements in light bottles were corrected to remove the rate measured in parallel dark bottles. All rates are in units mg C m-3; ‘stdev’ refers to the standard deviation of duplicates for each incubation type. NaNs represent data missing or not collected.</p>
14C dating of event layers in Erimo, Hokkaido, Japan
<p><sup>This 14C dating data is associated with the academic paper published in "Spatial extent of mid- to late-Holocene sedimentary record of tsunamis along the Southern Kuril Trench, Hokkaido, Japan." For details of the paper, please refer to the link below.</sup></p> <p><sup><a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2022GC010334" target="_blank" rel="noopener noreferrer">https://doi.org/10.1029/2022GC010334</a></sup></p> <p> </p>
Dalarna län 14C dates and KDE .txt results
<p>Excel file of complied archaeological 14C dates and associated data for Dalarna län, Sweden</p> <p>OxCal KDE .txt files for analysis run on data</p> <p> </p>
CDOM spectral slope (S275-295) as tracers of water masses, CDOM heterogeneity, and 14C-DOC in an oligotrophic marginal sea
<p>The present study is focused on the CDOM vertical profiles in the northern South China Sea. The results suggest humic-like FDOM is controlling the variation of the spectral slope of CDOM (<em>S</em><sub>275-295</sub>). In addition, our results suggest <em>S</em><sub>275-295</sub> could be used as tracers of water mass, CDOM diversity and radiocarbon age of dissolved organic carbon in oligotrophic ocean.</p>
Gradients 4 - TN397 - 14C NPP - Arrays
<p>Standard HOT protocols were used to measure in vitro primary productivity (PP) via the 14C radiotracer method [Karl et al., 1996]. Water samples were collected via CTD before dawn at certain depths, treated, and then redeployed on an array to the depths from which the water was sampled. A time zero sample was taken at each station to ensure acidification was complete. Following 12-hr dawn to dusk incubations in situ, the arrays were recovered and each sample was filtered onto a 25mm glass fiber filter. Filters were acidified with 1 ml of 2N hydrochloric acid in a fume hood for 12 hr to remove inorganic 14C after which 10 ml of Ultima Gold scintillation fluid was added to each sample. Radioactivity was determined using a Perkins Elmer 2600 liquid scintillation counter. The rate of primary productivity was calculated by multiplying the percent of carbon labeled by the total carbon available for photosynthesis (e.g. dissolved inorganic carbon, DIC, calculated from SST and salinity measured at each station as per Lee et al. [2006]) and dividing by incubation time (t = 1 day). Time stamp is in UTC.</p>
Mass-balance Study of [14C]-APD421 in Healthy Volunteers
ClinicalTrials.gov study NCT02881840. IPD Sharing: NO. Countries: 1. Publications: 1.
Study to Investigate the Absorption, Metabolism, and Excretion of [14C]-Pamiparib in Participants With Advanced Cancer
ClinicalTrials.gov study NCT03991494. IPD Sharing: YES. Countries: 1. Publications: 1.
A Study to Assess Absolute Bioavailability (ABA) of Mobocertinib (TAK-788) and to Characterize Mass Balance, Pharmacokinetics (PK), Metabolism, and Excretion of Carbon-14 ([14C])-Mobocertinib in Male
ClinicalTrials.gov study NCT03811834. IPD Sharing: NO. Countries: 1. Publications: 1.
Human Absorption, Distribution and Metabolism Study (hAME) [14C]-KD025
ClinicalTrials.gov study NCT03907540. IPD Sharing: NO. Countries: 1. Publications: 1.
A Phase I, Open-label Study to Assess Bioavailability of a Single Oral Dose of AZD9291 vs an IV Dose of [14C]AZD9291
ClinicalTrials.gov study NCT02491944. IPD Sharing: Not stated. Countries: 1. Publications: 1.
A Study to Determine the Metabolism and Elimination of 14C-E7080 in Patients With Advanced Solid Tumors or Lymphomas, Who Are Unsuitable For, or Have Failed, Existing Therapies.
ClinicalTrials.gov study NCT02578316. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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