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424 results for “14C”
Data from: Constraining soil hydrothermal CO2 degassing across the Changbaishan volcanic area: insights from 13C-14C perspective
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Data from: A novel post-1950 CE atmospheric 14C record for the tropics using absolutely dated tree rings in the equatorial Amazon
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Time-series measurements of size fractionated primary production (14C-assimilation) in the subtropical North Pacific Ocean
<p>Filter size-fractionated (>0.2-3 μm) particulate 14C-based rates of primary production were measured at six discrete depths (5, 25, 45, 75, 100, and 125 m) throughout the euphotic zone. Seawater samples from each depth were subsampled into triplicate 30-mL polycarbonate centrifuge tubes from a pre-dawn cast, inoculated with 70 µL of NaH14CO3-, then incubated over the full photoperiod (~12-14 hours) on a floating in situ array at the corresponding depths where the water was collected. At the end of the incubation period (after sundown), 25 mL of each sample was vacuum-filtered first onto a 25-mm diameter 3-μm pore size polycarbonate membrane, then the filtrate was vacuum-filtered onto a 25-mm diameter 0.2-μm pore size polycarbonate membrane filter. The rates reported here are for the >0.2-3 μm size fraction.</p>
Time series measurements of 14C-based primary production (>0.2 um) in the subtropical North Pacific Ocean
<p>Over a 3-year period (April 2010-April 2013), we measured primary production from vertical profiles at near-monthly time scales in the subtropical North Pacific Ocean. Production measurements were based on <sup>14</sup>C-assimilation into >0.2 um plankton biomass. Seawater for the productivity measurements was collected from predawn CTD hydrocasts into acid-cleaned 500-ml polycarbonate bottles. A total of four replicate 500 ml bottles were subsampled per depth and each bottle was spiked with ~1.85 MBq <sup>14</sup>C-bicarbonate. One hundred milliliters from one replicate per depth was immediately vacuum filtered through a polycarbonate filter as a time zero blank. These filters were placed in 20 ml glass scintillation vials and stored at -20oC until shore-based laboratory processing. The remaining three bottles were hung on a free-drifting array, deployed before dawn, and incubated at their initial collection depths throughout the photoperiod (typically 11-13 hours). After sunset the array was recovered, and 100 ml subsamples of all bottles were filtered under gentle vacuum onto 0.2 um polycarbonate filters that were then placed in scintillation vials and frozen. The total radioactivity added to each sample bottle was determined by subsampling 250 µl aliquots into scintillation vials containing 500 µl of β-phenylethylamine. At the shore-based laboratory, filters were acidified, passively vented, and the resulting radioactivity was determined using liquid scintillation counting.</p>
Gradients1-KOK1606_14C-NPP_2020-03-04_V1.3
<p>Cruise Name: KOK1606, Gradients 1.0.</p> <p>Project: Simons Foundation - Gradients NPSG</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. Parallel samples were taken in duplicate to examine the influence of reduced light on PP for all stations. Duplicate 500-ml bottles were incubated inside mesh bags that reduced the light availability to ~25%. 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. Abbreviations for rate measurements are in the variable metadata. All rates are in units mg C m-3; ‘stdev’ refers to the standard deviation of duplicates for each incubation type, whereas ‘stdev-p’ refers to the propagated standard deviation. NaN’s represent stations or samples where rate measurements were not conducted.</p>
Data from: Dynamics of deep soil carbon - insights from 14C time series across a climatic gradient
Quantitative constraints on soil organic matter (SOM) dynamics are essential for comprehensive understanding of the terrestrial carbon cycle. Deep soil carbon is of particular interest, as it represents large stocks and its turnover times remain highly uncertain. In this study, SOM dynamics in both the top and deep soil across a climatic (average temperature ~1-9 °C) gradient are determined using time-series (~20 years) 14C data from bulk soil and water-extractable organic carbon (WEOC). Analytical measurements reveal enrichment of bomb-derived radiocarbon in the deep soil layers on the bulk level during the last two decades. The WEOC pool is strongly enriched in bomb-derived carbon, indicating that it is a dynamic pool. Turnover time estimates of both the bulk and WEOC pool show that the latter cycles up to a magnitude faster than the former. The presence of bomb-derived carbon in the deep soil, as well as the rapidly turning WEOC pool across the climatic gradient implies that there likely is a dynamic component of carbon in the deep soil. Precipitation and bedrock type appear to exert a stronger influence on soil C turnover time and stocks as compared to temperature.
FIGURE 14c, d in A revision of the taxonomy and distribution of Archispirostreptus Silvestri 1895 (Diplopoda, Spirostreptida, Spirostreptidae), and description of a new spirostreptid genus with three new species
FIGURE 14c, d. Cacuminostreptus vumbaensis (NMZ/D602). c, oral view of prefemoral lobe of first pair of male legs; d, lateral view of collum.
Data for: Phytoplankton primary productivity: a dual-incubation approach for direct comparison of photosystem II photosynthetic flux (JVPII) and 14C-fixation experiments
<p>Data summary and LabSTAF raw data from manuscript "Phytoplankton primary productivity: a dual-incubation approach for direct comparison of photosystem II photosynthetic flux (JVPII) and 14C-fixation experiments" by <span>Nina Schuback, Kevin Oxborough, Mary Burkitt-Gray, </span><span>Patricia López-García, Matthew D. Patey, </span><span>Emily Hammermeister, Alan Wright, C. Mark Moore</span></p>
Alkyl lipid distribution, elemental composition and compound-specific 14C isotope composition in marine and terrestrial sedimentary archives from sub-Antarctic South Georgia
<p>The dataset comprises elemental data, alkyl lipid data and radiocarbon (14C) data that was obtained on sediment samples from sub-Antarctic South Georgia. The sediments were collected from a range of different sites, including lakes, peat deposits, a marine inlet and a fjord during RV Polarstern expedition PS81 in 2013. More details on the study sites, sampling and data evaluation can be found in Berg et al. (submitted manuscript to JGR Biogeochemistry).</p>
14C, d13C and d15N for bones from the Femern project
<p>This file contains basic information (species, 14C age, d13C and d15N) for animal bones analysed in the Femern project, as well as average d13C values for wood samples.</p> <p>This is supplementary data for Philippsen, B. (2023) Changing diet in a changing world. In: Groß, D. and Rothstein, M. (eds) Changing Identities in a Changing World.</p>
Supplementary Tables: 14C dating and Compound Specific Radiocarbon Analyses
<p>The two Supplementary Tables contain results from <sup>14</sup>C dating and Compound Specific Radiocarbon Analysis (CSRA) carried out on long chain Fatty Acid Methyl Esters (FAMEs).</p>
Metabolism and Excretion of [14C]-Rigosertib After Infusion to Volunteers
ClinicalTrials.gov study NCT02030639. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Intravenous Microdose Pharmacokinetic (PK) Study With [14C]-GSK2239633
ClinicalTrials.gov study NCT01086462. IPD Sharing: YES. Countries: 1. Publications: 1.
A Study to Assess the Mass Balance Recovery and Metabolite Profile & Identification of [14C]-APX001 in Healthy Males
ClinicalTrials.gov study NCT04804059. IPD Sharing: Not stated. Countries: 1. Publications: 1.
A Study to Determine the Absorption, Metabolism, and Routes of Excretion of (14C) Radiolabeled Ibrutinib in Healthy Male Participants
ClinicalTrials.gov study NCT01674322. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Pharmacokinetics, Mass Balance, and Metabolism of [14C]HSK21542 in Healthy Adult Male Volunteers.
ClinicalTrials.gov study NCT05835934. IPD Sharing: NO. Countries: 1. Publications: 1.
Study to Assess Absolute Bioavailability (ABA) of TAK-906 and to Characterize Mass Balance, Pharmacokinetics (PK), Metabolism, and Excretion of [14C]-TAK-906 in Healthy Male Participants
ClinicalTrials.gov study NCT04454918. IPD Sharing: YES. Countries: 1. Publications: 0.
Mass Balance Study of [14C]-NT-814 Oral Suspension in Healthy Male Subjects
ClinicalTrials.gov study NCT04654897. IPD Sharing: NO. Countries: 1. Publications: 1.
Mass Balance Study of [14C] TAS-205 in Healthy Volunteers
ClinicalTrials.gov study NCT04825431. IPD Sharing: NO. Countries: 1. Publications: 1.
Mass Balance and Biotransformation Study of [14C]LXI-15028 in Humans
ClinicalTrials.gov study NCT05883306. IPD Sharing: Not stated. Countries: 1. Publications: 1.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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