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Carbon Isotope - Europe PMC

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Last Updated: 10 January 2023

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Effects of RuBisCO and CO 2 concentration on cyanobacterial growth and carbon isotope fractionation.

Carbon isotope biosignatures preserved in the Precambrian geologic record are mainly found to represent ancient cyanobacterial carbon fixation that is primarily produced by Form I RuBisCO enzymes. We hypothesized that RuBisCO expression changes would have an effect on intracellular CO 2 fixation's net rates versus CO 2 supply's net rates and thus whole-cell carbon isotope discrimination. Cell growth and oxygen evolution rates were analyzed under changing CO 2 conditions, in particular, we investigated RuBisCO overexpression under changing CO 2 levels. At elevated CO 2 levels, we discovered that an increased body of active RuBisCO does not have a major effect on the 13 C/ 12 C isotopic discrimination at all tested CO 2 concentrations, yielding a u03b5 p of u203030 for both wild-type and mutant strains at elevated CO 2 levels.

Source link: https://europepmc.org/article/MED/36602111


Urban CO 2 imprints on carbon isotope and growth of Chinese pine in the Beijing metropolitan region.

Rapid urbanization has occurred around the world, resulting in rising CO2 emissions from urban areas. Rising urban-rural gradients of CO 2 emissions indicate that rising urban-periurban-rural gradients of CO 2 are reflected in rising urban-periurban-rural gradients of CO 2 emissions in comparison to natural forests. We investigated whether and how urban CO 2 pollution affected stable carbon isotope ratios and tree growth spatially and/or temporally in Beijing, China's northern area. We collected foliage and tree rings of Chinese pine in the Beijing metropolitan area, finding that and how urban CO 2 pollution influence stable carbon isotope ratios and tree growth spatially and/or temporally. With tree-ring u03b4 13 C values decreasing over the last four decades, we also found a temporal pattern that was mainly explained by rising CO2 levels in the past four decades. These results reveal strong CO 2-associated imprints of urbanization on plant u03b4 13 C and expansion, as well as empirical evidence of significant CO 2 induced urban forest change.

Source link: https://europepmc.org/article/MED/36610623


The role of groundwater in CO 2 production and carbon storage in Mediterranean peatlands: An isotope geochemistry approach.

Little information is available about their responses to global change, which is why most Earth system climate models recommend a linear increase in the emission of greenhouse gases, such as CO 2 with rising temperatures. Even if such peatlands release CO 2 into the atmosphere, they can maintain a carbon storage capacity, as shown in the current report. The entire dataset is complete, with peat soil and organic matter content exceeding 100% organic matter and CO2 levels, making it possible to present arguments in favour of lower organic matter oxidation relative to primary production. Overall, this report highlights the role of groundwater in CO 2 fluxes at the peatland-atmosphere interface and, more specifically, the need to determine the relationships between the water and carbon cycles to produce more accurate predictions of future global climate change.

Source link: https://europepmc.org/article/MED/36587657


Carbon Isotope Fractionation Characteristics of Normally Pressured Shale Gas from the Southeastern Margin of the Sichuan Basin; Insights into Shale Gas Storage Mechanisms

Since the introduction of shale gas in the Wufeng-Longmaxi Formation in the Sichuan Basin, China's shale gas production and reserves have increased rapidly, the number of shale gas production and reserves have increased steadily. Samples of shale gas enrichment technique and promising shale gas regions were collected from various locations in order to demonstrate the shale gas enrichment scheme and effective shale gas regions, with the formation pressure coefficient varying between 0. 98 and 1. 35. The carbon isotope characteristics of normally pressured shale gas, such as mineral composition, organic abundance, organic pore formation, and gas content, are correlated with improved sweet spot evaluations in the study areas.

Source link: https://europepmc.org/article/MED/PMC9823672


Carbon Isotope Fractionation Characteristics of Normally Pressured Shale Gas from the Southeastern Margin of the Sichuan Basin; Insights into Shale Gas Storage Mechanisms.

Shale gas samples from various locations were collected in order to identify the shale gas enrichment device and safe shale gas areas, with the formation pressure coefficient varying between 0. 98 and 1. 35. The shale gas from the basin scale's carbon isotope characteristics were largely controlled using thermal maturity; as the thermal maturity increased, heavier carbon isotopes were discovered, in comparison to drier shale gas. The carbon isotope characteristics of normally pressured shale gas, including mineral composition, organic abundance, organic pore formation, and gas content, as well as the shale samples' geological parameters, show a greater efficiencies, indicating more suitable sweet spot evaluations in the targeted regions.

Source link: https://europepmc.org/article/MED/36616053


Above- and belowground interplay: Canopy CO 2 uptake, carbon and nitrogen allocation and isotope fractionation along the plant-ectomycorrhiza continuum.

In a Mediterranean beech forest, we investigated the interplay between ectomycorrhizas, ecosystem C fluxes, tree growth, C and N exchange, and isotopic fractionation. In rhizosphere soil, ectomycorrhizal fine root tips, ECM-free fine root portions, and leaves, we tracked from leaf break to leaf shedding. The evaluation of u03b4-13 C in ERT, leaves, and NCR showed the impact of canopy photosynthesis on ERT growth and an asynchronous seasonal C allocation policy between ERT and NCR at the root tips level. 15 N of leaves of concern were negatively correlated to that of ERT and were dependent on seasonal 15 N differences between ERT and NCR, according to N. u3b4 15 N of leaves was negatively related to that of ERT and dependent on seasonal 15 N differences between ERT and NCR. This information, which was collected in mature beech trees under natural conditions, can help to improve the understanding of Mediterranean forests' functionality.

Source link: https://europepmc.org/article/MED/36541420


A small-scale neutral alumina column chromatography method for carbon isotope determination of hopanes in crude oils or rock extracts.

Using neutral alumina as a solid phase adsorbent and a Pasteur pipette as a separation device, this paper describes a small-scale column chromatography method for distinguishing hopanes in crude oil or rock extracts. Using GC-MS, Ten Fractions were collected and tested for the chemicals in each eluted Fraction. A quantitative approach was used to determine distribution characteristics of compounds. Experimental findings showed that 100-200 um neutral alumina demonstrated significant differences in the adsorptive capacity of biomarkers from oil samples and rock extracts. The Total Ion Chromatography of hopanes was consistent with the m/z191 mass chromatogram's distribution characteristics. As the column length increased, the C 29 Ts/C 29 Ts/C 29b1 /u03b2 ratio of hopanes decreased gradually from 1. 63 to 0. 7. The C 29 Ts/C 29 Ts/C 29 u03b1u03b2 ratio is not only affected by maturity, but also by water and gas migration, according to the author.

Source link: https://europepmc.org/article/MED/36587588

* 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