Advanced searches left 3/3

Carbon 14 - PubAg

Summarized by Plex Scholar
Last Updated: 15 October 2021

* If you want to update the article please login/register

Short-term accumulation and elimination of carbon-14 in the common carp Cyprinus carpio under laboratory conditions

This research checked out the short term transfer of carbon-14 in the common carp Cyprinus carpio under lab problems. Radiolabelled food was prepared with ¹⁴ C-labelled arginine or sugar in order to examine exactly how transfer kinetics might differ with the biochemical form of ¹⁴ C. Elimination experiments were attained using fish fed for 5 days on radiolabelled food and then put under malnourishment for 4 days. Results recommended that straight water-to-fish absorption rate was 20% d ⁻¹ per fish. For either arginine or sugar, results suggested that 19-- 20% of ingested ¹⁴ C was incorporated, generating a considerable increase in fish activity over days. Complete activity in the muscle mass stood for 29%-- 32% of entire body task, this percentage showing the contribution of muscular tissue to entire body weight. Results recommended that an essential amino-acid like arginine can be used as an energy resource under hunger and that muscles can work as a storage space for essential amino-acids.

Source link: https://pubag.nal.usda.gov/catalog/7328085


Optimisation of a batch thermal combustion method using a tube furnace oxidation system (pyrolyser) and LSC for carbon-14 determination in environmental matrices

Thermal oxidation is one of the methods used for ¹⁴ C resolution in environmental matrices. In this technique, the sample is oxidised at high temperature to transform carbon types to carbon monoxide ₂ and caught in an amine-based absorber for establishing the task in a fluid scintillation counting system. In the boosted approach, the CO ₂ generated from the combustion of the sample was isolated from the combustion products with cryogenic capturing and after that soaked up in the absorber via a straightforward off-line transfer process. Upon optimization, the viability of the approach for the resolution of ¹⁴ C certain activity in common terrestrial biota samples of tidy air area and for the metrology of a little increase in the ¹⁴ C activity above ambient levels at a nuclear reactor is shown.

Source link: https://pubag.nal.usda.gov/catalog/7134308


Using Carbon-14 of dissolved organic carbon to determine groundwater ages and travel times in aquifers with low organic carbon

This study utilized dissolved organic carbon carbon-14 to determine groundwater ages that were then used to determine groundwater traveling times in southern Nevada aquifers that have low organic content. Groundwater traveling times for aquifers in southern Nevada using DOC ¹⁴ C are countless years much shorter than DIC ¹⁴ C traveling times for groundwater circulation outside of recharge areas along four of the 5 circulation courses evaluated for this research study. The DOC ¹⁴ C traveling times range from 2,300 to 2,900 years as contrasted to DIC ¹⁴ C traveling times that vary from 8,200 to 22,000 yrs and 4,700 to 19,000 years. DOC ¹⁴ C travel time calculations require to represent fewer processes than DIC ¹⁴ C for aquifers that have little raw material and do not have redox reactions. DOC ¹⁴ C travel-times can be determined directly from the DOC ¹⁴ C information in these aquifers without improvements if dissolution of natural carbon and sorption and matrix diffusion of DOC ¹⁴ C onto or into the aquifer matrix is minimal. The absence of dissolution of natural carbon in research study location aquifers is also supported by the reduction in DOC along flow courses and the DOC structure of groundwater altering little as groundwater streams from recharge areas into the surrounding valleys.

Source link: https://pubag.nal.usda.gov/catalog/7194638


The Behavior of Low Molecular Weight Organic Carbon-14 Containing Compounds in Contaminated Groundwater During Denitrification and Iron-Reduction

Liquid reduced molecular weight organic carbon-14 substances can be formed by the oxidation of carbide and impurities within nuclear gas cladding. During reprocessing and acting storage ¹⁴ C-labeled natural substances may leak to the shallow subsurface environments at nuclear facilities where denitrifying and iron decreasing zones can exist. Under iron-reducing problems both ¹⁴ C-carboxylates were gotten rid of from option rapidly, however some formaldehyde and methanol remained in remedy 32 days after shot into the microcosm so there is capacity that a percentage of ¹⁴ C-formaldehyde and ¹⁴ C-methanol may persist for longer in subsurface environments.

Source link: https://pubag.nal.usda.gov/catalog/6950165


Carbon-14 dating when there's no ring on it: Age of four Pondoland grassland geoxyles and lessons learned

Yearly development rings are lacking in many long-lived grassland geoxyles. Plants experienced in 2008 dropped within modern-day concentrations of carbon 14; consequently, radiocarbon dating normally generated 2 ages for each plant, an older age referring the nuclear screening period, and a more youthful age, representing the period after the Partial Nuclear Test Ban Treaty. P. simplex plants were 16, 24, 27 and 29, or 45, 46-- 49, 47 and 49 years, T. kraussiana 13, 15 and 16, or 50 and two of 51 years, C. laureola 12, 15 and 21, or 49-- 50 and two of 50 years and B. insignis were 10, or 49, 50 and 51 years old. The majority of studies have utilized radiocarbon dating to estimate the age of woody tree stem tissue, whereas this research is one of few to gauge the age of below-ground modern cells of South African forbs.

Source link: https://pubag.nal.usda.gov/catalog/7000816


Organically bound tritium (OBT) and carbon-14 accumulation in the sediments off the mouth of the Rhône river

Even with the impact of the climatic nuclear examinations of the 1950s and 1960s, and of the discharges of carbon-14 by the nuclear markets located along the Rhône, carbon-14 degrees are low because of the watering down result of a refractory carbon part really low in carbon-14 present in the seaside debris. Thorough study of the influence of the numerous contribution to the tritium height indicates that these traces are primarily the result of the debris in the Rhône being contaminated by past tritium releases by the watchmaking sector in the top Rhône.

Source link: https://pubag.nal.usda.gov/catalog/6278237


Insights of carbon assimilation and allocation in young cork oak (Quercus suber L.) plants using Carbon‐14

¹⁴ C approaches were related to young, woody, branched and well‐watered cork oak plants to determine carbon assimilation and its distribution among plant organs. Carbon adaptation rates by attached leaves secured in a foliar ¹⁴ CO ₂ assimilation chamber containing 3. 7 × 10 ⁴ Bq of a portable ventilated diffusion porometer were gauged at different ¹⁴ CARBON MONOXIDE ₂ pulse‐labeling periods in summer season. Allowance of recently repaired C by attached fallen leaves within plants was evaluated 7 days after a 60‐min of 5. 6 MBq of ¹⁴ CO ₂ pulse‐labeling in late wintertime. Our outcomes show the optimum ¹⁴ CO ₂ pulse‐labeling duration is in between 15 and 30 s, which matches to 9. 81 ± 0. 15 and 9. 16 ± 0. 12 µmol m ⁻² s ⁻¹ C adaptation rates in summer season, respectively. Our outcomes highlight the contribution of current assimilates for growth and upkeep of origins, in young woody plants under Mediterranean climate.

Source link: https://pubag.nal.usda.gov/catalog/6852933


Identifying Fraudulent Natural Products: A Perspective on the Application of Carbon-14 Analysis

Throughout food and supplement markets, there is a growing trend toward products made up of natural components. This viewpoint highlights the application of carbon-14 evaluation to display for prospective contamination of natural components, such as garlic oil. With comparison to other analytical methods made use of for high quality control, carbon-14 testing stands apart as being able to discover petrochemical-derived nature-identical compounds.

Source link: https://pubag.nal.usda.gov/catalog/6778643

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions