Accedi

Bibliografie tematiche / Carbon isotope composition / Articoli di riviste

Segui questo link per vedere altri tipi di pubblicazioni sul tema: Carbon isotope composition.

Articoli di riviste sul tema "Carbon isotope composition"

Autore: Grafiati

Pubblicato: 8 giugno 2024

Ultima modifica: 26 luglio 2025

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Vedi i top-50 articoli di riviste per l'attività di ricerca sul tema "Carbon isotope composition".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Vedi gli articoli di riviste di molte aree scientifiche e compila una bibliografia corretta.

1

Swart, Peter K., and Jim J. Leder. "The utility of stable isotopic signatures in coral skeletons." Paleontological Society Papers 1 (October 1996): 249–91. http://dx.doi.org/10.1017/s1089332600000127.

Testo completo

Abstract (sommario):

There is a fundamental ecologic differentiation between zooxanthellate and non-zooxanthellate corals. This paper reviews factors which govern the stable carbon and oxygen isotopic composition of these groups of corals. Although the stable carbon and oxygen isotope compositions of coral skeletons are strongly influenced by environmental and physiological factors, the precise mechanisms remain a matter of debate. In particular the oxygen isotopic composition is known to be governed by the temperature and the oxygen isotopic composition of the water and perhaps also by kinetic factors. In contras

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Sare, David T. J., John S. Millar, and Frederick J. Longstaffe. "Tracing dietary protein in red-backed voles (Clethrionomys gapperi) using stable isotopes of nitrogen and carbon." Canadian Journal of Zoology 83, no. 5 (2005): 717–25. http://dx.doi.org/10.1139/z05-064.

Testo completo

Abstract (sommario):

We examined the stable isotopes of nitrogen and carbon in a small mammal, the red-backed vole (Clethroinomys gapperi (Vigors, 1830)), to determine if isotope signatures reflect diet composition. Nitrogen- and carbon-isotope ratios in tissues from voles maintained on different protein levels in the laboratory were compared with wild-trapped voles. The isotopic fractionation of dietary nitrogen and carbon was also examined as food was digested in the stomach, incorporated into bone collagen, bioapatite, and hair, and excreted as feces. Nitrogen and carbon isotopes were fractionated differently d

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Friedman, Gerald M., and Chandan Chakraborty. "Stable Isotopes in Marine Carbonates: Their Implications for the Paleoenvironment with Special Reference to the Proterozoic Vindbyan Carbonates (Central India)." Journal Geological Society of India 50, no. 2 (1997): 131–59. http://dx.doi.org/10.17491/jgsi/1997/500203.

Testo completo

Abstract (sommario):

Abstract The carbon and oxygen isotopic compositions of the minerals of carbonate rocks depend on the composition of the precipitating water and the temperature of precipitation. The carbon isotopes suffer little fractionation during precipitation of carbonate minerals and their carbon isotopic composition reflects that of the precipitating water. On the other hand, carbonate minerals become enriched in 18O with respect to the precipitating water and the degree of enrichment depends on the temperature of precipitation - lower the temperature, higher the enrichment. Isotopic studies of marine c

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Gruzdev, D. A., A. V. Zhuravlev, Ya A. Vevel, A. V. Erofeevsky, and I. V. Smoleva. "Famennian negative carbon isotope excursion in the Izyayu River section (Tchernyshev Uplift, Cis-Uralian Foredeep)." LITHOSPHERE (Russia) 23, no. 2 (2023): 165–78. http://dx.doi.org/10.24930/1681-9004-2023-23-2-165-178.

Testo completo

Abstract (sommario):

Research subject. The article is focused on manifestations of the Early-Middle Famennian negative excursion in carbon isotope composition in the Izyayu River section (south of the Tchernyshev Uplift). Aim. The study is aimed to reconstructing of the probable causes of this isotope excursion. Materials and methods. The article is based on the results of study of the deep-shelf lower-middle Famennian sequence of the Izyayu River section. The carbon isotopic composition was studied for the carbonate samples and conodont elements (32 and 9 samples respectively). Results. The lightening of the carb

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Zhuravlev, A. V., and I. V. Smoleva. "Preliminary results of studying the carbon isotope composition of conodont elements at the border of Devonian and Carboniferous periods (Kamenka river sections, Pechora carbonate platform)." LITHOSPHERE (Russia) 20, no. 6 (2020): 829–41. http://dx.doi.org/10.24930/1681-9004-2020-20-6-829-841.

Testo completo

Abstract (sommario):

Research subject. Changes in the trophic structure of shallow-water pelagic ecosystems at the Devonian/Carboniferous border were investigated by studying the carbon isotope composition of conodont organic matter.Materials and methods. Two Devonian-Carboniferous shallow-water clayey-carbonate sections located in the southern part of the Pechora-Kozhva Uplift (Pechora Plate) were analysed. The Devonian-Carboniferous boundary was detected by the first occurrences of Siphonodella sulcata, S. semichatovae and Patrognathus crassus, as well as by the last occurrence of Pseudopolygnathus graulichi. Th

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Passey, Benjamin H. "Reconstructing Terrestrial Environments Using Stable Isotopes in Fossil Teeth and Paleosol Carbonates." Paleontological Society Papers 18 (November 2012): 167–94. http://dx.doi.org/10.1017/s1089332600002606.

Testo completo

Abstract (sommario):

Carbon isotopes in Neogene-age fossil teeth and paleosol carbonates are commonly interpreted in the context of past distributions of C3 and C4 vegetation. These two plant types have very different distributions in relation to climate and ecology, and provide a robust basis for reconstructing terrestrial paleoclimates and paleoenvironments during the Neogene. Carbon isotopes in pre-Neogene fossil teeth are usually interpreted in the context of changes in the δ13C value of atmospheric CO2, and variable climate-dependent carbon-isotope discrimination in C3 plants. Carbon isotopes in pre-Neogene s

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Irei, Satoshi. "Isotopic Characterization of Gaseous Mercury and Particulate Water-Soluble Organic Carbon Emitted from Open Grass Field Burning in Aso, Japan." Applied Sciences 12, no. 1 (2021): 109. http://dx.doi.org/10.3390/app12010109.

Testo completo

Abstract (sommario):

Biomass burning is one of the major emitters of airborne particulate matter (PM) and gaseous mercury. In order to apply the isotopic fingerprinting method to process identification and source apportionment studies, isotopic characterizations of targeted substances at emission are indispensable. Here, we report the stable isotopic composition of total gaseous mercury (TGM) and the stable and radiocarbon isotopic composition of low-volatile water-soluble nitrogen (LV-WSN) and organic carbon (LV-WSOC) in PM emitted from open grass field burning in the Aso region of Japan. The measurement results

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Evans, JR, TD Sharkey, JA Berry, and GD Farquhar. "Carbon Isotope Discrimination measured Concurrently with Gas Exchange to Investigate CO2 Diffusion in Leaves of Higher Plants." Functional Plant Biology 13, no. 2 (1986): 281. http://dx.doi.org/10.1071/pp9860281.

Testo completo

Abstract (sommario):

Conventional gas-exchange techniques that measure the stomatal conductance and rate of CO2 assimilation of leaves were combined with measurements of the carbon isotope composition of CO2 in air passing over a leaf. Isotopic discrimination during uptake was determined from the difference in the carbon isotope composition of air entering and leaving the leaf chamber. Isotopic discrimination measured over the short term correlated strongly with that determined from combusted leaf material. Environmental conditions were manipulated to alter the relative influences of stomatal conductance and carbo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Kennedy, Brenda V., and H. Roy Krouse. "Isotope fractionation by plants and animals: implications for nutrition research." Canadian Journal of Physiology and Pharmacology 68, no. 7 (1990): 960–72. http://dx.doi.org/10.1139/y90-146.

Testo completo

Abstract (sommario):

The isotopic compositions of animal tissues, minerals, and fluids reflect those of ingested food and water and inhaled gases. This relationship is illustrated by a review of data pertaining to five light elements of biological interest (carbon, nitrogen, hydrogen, oxygen, and sulphur). Processes affecting the isotopic composition of inorganic compounds in reservoirs are summarized, and isotope fractionation during transfer of elements from these inorganic reservoirs through progressive trophic levels of food webs is discussed. Variability of δ values within and among individuals, populations,

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Smith, J. J., J. S. Millar, F. J. Longstaffe, and R. Boonstra. "The effect of metabolic rate on stable carbon and nitrogen isotope compositions in deer mice, Peromyscus maniculatus." Canadian Journal of Zoology 88, no. 1 (2010): 36–42. http://dx.doi.org/10.1139/z09-116.

Testo completo

Abstract (sommario):

The stable isotopic compositions of nitrogen and carbon in animal tissues reflect diet. However, factors other than diet can also affect these stable isotope ratios, leading to misinterpretations of diet composition. To test the hypothesis that variation in metabolic rate alters the isotopic compositions of tissues, deer mice ( Peromyscus maniculatus (Wagner, 1845)) were kept at three temperatures (thermoneutral (23 °C), cool (5 °C), and cold (–10 °C)) and fed ad libitum. The changes in carbon and nitrogen isotope compositions of liver associated with the thermoneutral versus cool and cold con

Gli stili APA, Harvard, Vancouver, ISO e altri

11

HUA, ZHONG, and MA YONGSHENG. "Carbon isotope stratigraphy of dolomites in the early Proterozoic succession, north China." Geological Magazine 134, no. 6 (1997): 763–70. http://dx.doi.org/10.1017/s0016756897007577.

Testo completo

Abstract (sommario):

Four hundred and eighty-four whole rock dolomite samples from early Proterozoic strata have been analysed for carbon isotopes. The carbon isotope composition is strata-specific, but abrupt variations have been observed between the Jianancun and the Daguandong as well as the Daguandong and Huaiyincun formations. The carbon isotope composition of dolomites is believed to reflect δ13C of oceanic total dissolved inorganic carbon during the early Proterozoic and reflect changing rates of organic carbon burial.

Gli stili APA, Harvard, Vancouver, ISO e altri

12

Benbow, Timothy J., Alan R. Hayman, Robert Van Hale, and Russell Frew. "Preparation of aqueous fatty acids for hydrogen and carbon stable isotope analysis by solid phase extraction." Marine and Freshwater Research 64, no. 4 (2013): 294. http://dx.doi.org/10.1071/mf12192.

Testo completo

Abstract (sommario):

Stable isotope analyses of fatty acids in environmental waters provides important information as to their source(s). Analysis is often confounded due to low concentrations of fatty acids and/or a complex sample matrix requiring separation of the target analyte. The purpose of this study was to validate a method to extract fatty acids from natural waters using solid phase extraction (SPE) before compound specific isotope analysis (CSIA). Three SPE cartridges and multiple eluting solvents were tested to determine the efficiency, isotopic fractionation, and reproducibility of each extraction tech

Gli stili APA, Harvard, Vancouver, ISO e altri

13

Cao, Chunhui, Zhongping Li, Liwu Li, and Li Du. "Method for Analyzing the Molecular and Carbon Isotope Composition of Volatile Hydrocarbons (C1–C9) in Natural Gas." Journal of Analytical Methods in Chemistry 2018 (December 18, 2018): 1–9. http://dx.doi.org/10.1155/2018/4512081.

Testo completo

Abstract (sommario):

Solid-phase microextraction (SPME) coupled with gas chromatography-isotope ratio mass spectrometry (GC-IRMS) has already been applied to collect and identify volatile light hydrocarbons in oil and source rocks. However, this technology has not yet been used to analyze volatile light hydrocarbons in dry gas (natural gas with C1/C2+> 95%). In this study, we developed a method to measure the molecular and carbon isotope composition of natural gas using divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber. This fiber proved to be suitable for extracting C1–C9hydrocarbons from natur

Gli stili APA, Harvard, Vancouver, ISO e altri

14

Krasnova, Elizaveta A., Anna Yu Yurchenko, Anton G. Kalmykov, and Maria M. Fomina. "Isotopic-geochemical peculiarities of distribution of gas hydrocarbons in the Bazhenov formation section (South part of the Western Siberia)." Georesursy 21, no. 2 (2019): 153–58. http://dx.doi.org/10.18599/grs.2019.2.153-158.

Testo completo

Abstract (sommario):

In this work we describe the distribution of stable carbon isotopes in hydrocarbon gases from four wells located in the southern and central parts of the Western Siberia. The main goal was to understand the influence of the lithological composition and geological settings on isotopic composition of gases and their formation. Two genetically different groups of hydrocarbon gases were identified based on the author’s research, as well as analysis of archival and literature materials on the isotope composition of hydrocarbons. We estimated the close relationship between the main factors of the mi

Gli stili APA, Harvard, Vancouver, ISO e altri

15

Balcaen, A., E. Claeys, V. Fievez, P. Boeckx, O. van Cleemput, and S. de Smet. "Stable carbon isotope analysis of faecal and blood samples of sheep in relation to the diet." Proceedings of the British Society of Animal Science 2003 (2003): 159. http://dx.doi.org/10.1017/s1752756200013181.

Testo completo

Abstract (sommario):

Stable isotopes have been extraordinarily helpful in understanding animal migration, diet, food webs and nutrient flow (Hilderbrand et al., 1996), based on the property that C3 and C4 plants possess distinctly different 13C/12C ratios (δ13C value) due to isotopic fractionation during photosynthetic carbon fixation (Smith & Epstein, 1971). Most woody species and temperate graminoids assimilate carbon via the Calvin cycle (C3), which discriminates stronger against the heavier isotope (13C) than Hatch-Slack (C4) species (tropical and subtropical graminoids and some shrubs). C3 and C4 plant sp

Gli stili APA, Harvard, Vancouver, ISO e altri

16

Yurchenko, Anna, Andrey Voropaev, Elena Kozlova, Nikita Morozov та Mikhail Spasennykh. "Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia". Geosciences 11, № 7 (2021): 264. http://dx.doi.org/10.3390/geosciences11070264.

Testo completo

Abstract (sommario):

This paper addresses potential application of data on stable carbon and oxygen isotope composition of carbonates for study of organic rich source rocks on the example of the Late Jurassic–Early Cretaceous Bazhenov Formation (West Siberian petroleum basin, Russia). Geochemical studies were conducted for sections located in central (most productive) and peripheral (northern and southern) regions of the Bazhenov Formation distribution area, containing deposits formed under different conditions. We identified key factors impacting stable isotope composition of carbonate minerals and established re

Gli stili APA, Harvard, Vancouver, ISO e altri

17

Кулешова, Т. Э., Е. С. Павлова та Н. Р. Галль. "Фракционирование изотопов углерода -=SUP=-13-=/SUP=-С/-=SUP=-12-=/SUP=-С из углекислого газа атмосферы в продукты фотосинтеза в листьях растений в зависимости от спектральных характеристик световой среды". Письма в журнал технической физики 46, № 16 (2020): 19. http://dx.doi.org/10.21883/pjtf.2020.16.49848.18333.

Testo completo

Abstract (sommario):

We have studied influence of the light with various spectral characteristics, coming to plants during its growth, on the distribution of carbon isotopes between atmospheric carbon dioxide and the primary products of photosynthesis in plant leaves, using the developed set of methods and laboratory setups. The difference between the carbon isotopic composition in the air near the plants and in their leaves varies from 7 to 19 ‰, increase in the red component of the spectrum resulting in leave enrichment with light carbon isotope 12C. This difference reflects the degree of isotope fractionation d

Gli stili APA, Harvard, Vancouver, ISO e altri

18

Ivanova, Elena Sergeevna, Olga Yurievna Rumiantseva, Anastasia Sergeevna Zavertkina, Anastasia Evgenievna Bueva, and Anna Sergeevna Elizarova. "The isotopic composition of hair among the population in the Vologda Region depending on the conditions of living and nutrition." Samara Journal of Science 10, no. 4 (2021): 46–50. http://dx.doi.org/10.17816/snv2021104107.

Testo completo

Abstract (sommario):

Isotope mass spectrometry methods are used to study changes in the isotopic composition of organisms in the food chain called trophic fractionation. In particular, with the help of isotope analysis of tissues, it is possible to determine the type of nutrition and possible place of residence of a person, which helps in solving the tasks of forensic examination. In this study, the isotopic composition C and ⁵N in the hair of residents of the industrial city of Cherepovets and the Kirillovsky District of the Vologda Region, remote from industrial sources of pollution, was determined. The determin

Gli stili APA, Harvard, Vancouver, ISO e altri

19

Eltsova, Liubov Sergeevna, Olga Vasilyevna Duryagina, Liudmila Victorovna Kuznetsova та Elena Sergeevna Ivanova. "Isotopic composition of carbon (ẟ¹³C) and nitrogen (ẟ¹⁵N) in the hair of the order Rodentia of the Vologda Region". Samara Journal of Science 13, № 4 (2024): 20–25. https://doi.org/10.55355/snv2024134103.

Testo completo

Abstract (sommario):

The study is devoted to the analysis of the ratio of stable carbon isotopes (ẟ¹³C) and stable nitrogen isotopes (ẟ¹⁵N) in the hair of mammals of the Rodentia order (Eurasian beaver –Castor fiberLinnaeus, 1758; Ural field mouse –Apodemus uralensisPallas, 1811; European water vole –Arvicola amphibius(Linnaeus, 1758); Muskrat –Ondatra zibethicusLinnaeus, 1766; Siberian chipmunk –Eutamias sibiricus(Laxmann, 1769); Siberian flying squirrel –Pteromys volansLinnaeus, 1758; Red squirrel –Sciurus vulgarisLinnaeus, 1758) in the Vologda Region.The isotopic composition of carbon in the hair of the studied

Gli stili APA, Harvard, Vancouver, ISO e altri

20

Gaigalas, Algirdas, and Stanislaw Halas. "Stable Isotopes (H, C, S) and the Origin of Baltic Amber." Geochronometria 33, no. -1 (2009): 33–36. http://dx.doi.org/10.2478/v10003-009-0001-9.

Testo completo

Abstract (sommario):

Stable Isotopes (H, C, S) and the Origin of Baltic Amber New results of isotope analysis of light elements (H, C and S) of a dozen Baltic amber samples are described and discussed. Carbon isotope composition was nearly constant (ca. -23‰), whereas sulphur and hydrogen varied in their isotope compositions from +4 to -28‰ and from -171 to -213‰, respectively. The formation and subsequent evolution of this material since its origin in Paleogene time until present is outlined.

Gli stili APA, Harvard, Vancouver, ISO e altri

21

Kelleway, J. J., S. M. Trevathan-Tackett, J. Baldock, and L. P. Critchley. "Plant litter composition and stable isotope signatures vary during decomposition in blue carbon ecosystems." Biogeochemistry 158, no. 2 (2022): 147–65. http://dx.doi.org/10.1007/s10533-022-00890-3.

Testo completo

Abstract (sommario):

AbstractThe ratio of isotopes of carbon (13C:12C or δ13C) and nitrogen (15N:14N or δ15N) are common indicators of the flow and storage of organic matter in coastal wetland research. Effective use of these indicators requires quantification and understanding of: (1) the variability of isotope signatures of potential organic matter source materials; and (2) the influence of organic matter decomposition on isotopic signatures. While it is well-established that organic matter characteristics change during the decomposition process, there has been little direct quantification of any concurrent shif

Gli stili APA, Harvard, Vancouver, ISO e altri

22

Novikov, Dmitry A., Aleksandr N. Pyrayev, Anastasia A. Maksimova, Fedor F. Dultsev та Anatoly V. Chernykh. "Evolution of the composition of Н, О and C stable isotopes in the groundwaters of oil and gas bearing sediments in the northern regions of West Siberia". Georesursy 25, № 4 (2023): 219–32. http://dx.doi.org/10.18599/grs.2023.4.16.

Testo completo

Abstract (sommario):

The results of a study of the isotopic composition of oxygen and hydrogen of groundwater and dissolved inorganic carbon in oil and gas deposits of the northern regions of Western Siberia, covering a wide stratigraphic range – Mesozoic and Paleozoic are presented. The obtained values are very diverse, covering the intervals from –120 to –50‰ (δD) and from –17 to –2‰ (δ18O). Such a variable isotopic composition of waters indicates the absence of a unified mechanism for the accumulation of waters and their transformation during the geological evolution of the West Siberian sedimentary basin. The

Gli stili APA, Harvard, Vancouver, ISO e altri

23

Ghent, Edward D., and James R. O'Neil. "Late Precambrian marbles of unusual carbon-isotope composition, southeastern British Columbia." Canadian Journal of Earth Sciences 22, no. 3 (1985): 324–29. http://dx.doi.org/10.1139/e85-032.

Testo completo

Abstract (sommario):

Carbon- and oxygen-isotope analyses were made of both carbonates and graphites from several Precambrian metamorphic samples from British Columbia. The carbon-isotope data are unusual in that the δ13C values of many marbles are very high, up to 9.9, and the most positive values occur in the sillimanite-zone rocks. The δ13C values of graphite are also relatively high, and the 13C fractionations between calcite and graphite suggest that (1) the rocks attained and retained carbon-isotope equilibrium during metamorphism, and (2) the temperature of graphite equilibration in marbles from the silliman

Gli stili APA, Harvard, Vancouver, ISO e altri

24

Novikov, Dmitry A., Aleksandr N. Pyrayev, Fedor F. Dultsev, Anatoliy V. Chernykh, Svetlana V. Bakustina, and Dmitry V. Ulyanov. "FORMATION CONDITIONS OF GROUNDWATER OF THE UPPER JURASSIC OF THE CENTRAL REGIONS OF THE ZAURAL MEGAMONOCLYSIS." Interexpo GEO-Siberia 2, no. 1 (2021): 181–90. http://dx.doi.org/10.33764/2618-981x-2021-2-1-181-190.

Testo completo

Abstract (sommario):

The article presents the first results of complex isotope-hydrogeochemical studies of reservoir waters of the Upper Jurassic deposits of the central regions of the Zaural megamonoclysis. It was shown that most waters have a narrow distribution of oxygen and hydrogen isotopes (δD from -103.2 to -85.6 ‰ and δO from -15.4 to -12.9 ‰). Some of them have pronounced excursions on the isotopic composition, which indicates a difference in their genesis: from condensate to mixed with ancient infiltrogenic. The isotopic composition of carbon of water-dissolved carbon dioxide (δС from -41.6 to -16.3 ‰) i

Gli stili APA, Harvard, Vancouver, ISO e altri

25

Taylor, Matthew D., and Debashish Mazumder. "Stable isotopes reveal post-release trophodynamic and ontogenetic changes in a released finfish, mulloway (Argyrosomus japonicus)." Marine and Freshwater Research 61, no. 3 (2010): 302. http://dx.doi.org/10.1071/mf09014.

Testo completo

Abstract (sommario):

Carbon and nitrogen stable isotope ratios were analysed for hatchery-reared, recaptured and wild mulloway, Argyrosomus japonicus, to investigate temporal and growth-related changes in isotopic composition for stocked fish after release, and to evaluate changes in isotopic composition in terms of ontogenetic dietary switches. δ13C and δ15N values decreased and increased, respectively, after release. The isotope composition of released fish was distinct from wild fish until 200 days after release, but after 200 days post-release fish did not differ significantly from wild fish of similar or grea

Gli stili APA, Harvard, Vancouver, ISO e altri

26

Valentini, R., T. Anfodillo та J. R. Ehleringer. "Water sources and carbon isotope composition (δ13C) of selected tree species of the Italian Alps". Canadian Journal of Forest Research 24, № 8 (1994): 1575–78. http://dx.doi.org/10.1139/x94-205.

Testo completo

Abstract (sommario):

Selected species of the Italian Alpine region (Piceaabies (L.) Karst., Pinussylvestris L., Pinuscembra L., and Larixdecidua L.) have been investigated in terms of water-source utilization and carbon fixation estimated by the analysis of hydrogen and carbon stable isotopes composition at two sites of differing altitude (1000 and 1500 m above sea level). Larixdecidua is the species most dependent on groundwater in both sites, while Pinussylvestris utilizes rainwater to a greater extent. Concurrently, Pinussylvestris displayed the highest value of the carbon isotopic ratio (δ13C = −25.9 ± 0.6‰),

Gli stili APA, Harvard, Vancouver, ISO e altri

27

Khubanova, A. M., V. B. Khubanov, and D. A. Miyagashev. "Zoning of Desert, Steppe, Steppe-Forest and Forest Ecosystems By Carbon And Nitrogen Isotope in Mongolia and Western Transbaikalia." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 16, no. 3 (2023): 14–31. http://dx.doi.org/10.24057/2071-9388-2023-2720.

Testo completo

Abstract (sommario):

The Mongolian–Transbaikalian region of the Central Asia is known for its wide range of intracontinental ecosystems from desert through steppe to taiga forest and mountain tundra. Data on the isotopic composition of carbon and nitrogen in the bone and dental tissues of herbivorous animals inhabiting the desert, steppe, and forest–steppe landscapes of Outer Mongolia and Western Transbaikalia are presented. The maximum values of the carbon isotope ratio are observed in animals from the desert (Gobi Desert) and the semi-desert landscapes, median (mean) δ13C is -17.9‰. The minimum values of δ13C we

Gli stili APA, Harvard, Vancouver, ISO e altri

28

Ivlev, A. A., V. A. Litvinsky, N. M. Przewalsky, et al. "On the use of isotopic differences of carbon fractions of biomass in plants to study transport flows and source-sink relations under different light conditions." Izvestiâ Akademii nauk. Rossijskaâ akademiâ nauk. Seriâ biologičeskaâ, no. 4 (October 26, 2024): 451–59. http://dx.doi.org/10.31857/s1026347024040039.

Testo completo

Abstract (sommario):

It is shown that the differences in the isotopic composition of carbon in the water-soluble and water-insoluble fractions of plant leaf biomass, as well as phloem, are evolutionarily determined. They associated with metabolic reactions during assimilation and photorespiration and do not depend on the illumination mode and on the spectral ranges of headlights used in illumination. The above isotopic shifts are the cause of isotopic differences in assimilatory and photorespiratory carbon stocks that feed various metabolic processes. Due to the strict temporal and spatial organization of metaboli

Gli stili APA, Harvard, Vancouver, ISO e altri

29

Humphrey, John D., and C. Reid Ferring. "Stable Isotopic Evidence for Latest Pleistocene and Holocene Climatic Change in North-Central Texas." Quaternary Research 41, no. 2 (1994): 200–213. http://dx.doi.org/10.1006/qres.1994.1022.

Testo completo

Abstract (sommario):

AbstractA paleoclimatic record for a southern Great Plains locality (the Aubrey Clovis site in north-central Texas) has been established using stable carbon and oxygen isotopes. Detailed composite stratigraphic sections, constrained by 14 C ages, place the age of these deposits between 14,200 and 1600 yr B.P. Calcium carbonate samples of lacustrine and pedogenic origin were analyzed. Oxygen isotopic compositions of most of these in situ carbonates reflect equilibrium precipitation from local meteoric waters. Oxygen isotope values reflect changes in the composition of meteoric waters tied to ch

Gli stili APA, Harvard, Vancouver, ISO e altri

30

Stelmach, Wioleta, Paweł Szarlip, and Andrzej Trembaczowski. "Changes of Isotopic Composition in Gases Emitted from Wastewater Treatment Plant - Preliminary Study." Ecological Chemistry and Engineering S 21, no. 2 (2014): 245–54. http://dx.doi.org/10.2478/eces-2014-0019.

Testo completo

Abstract (sommario):

Abstract Investigations of processes occurring during wastewater treatment have progressed beyond the stage of technology. Currently, great numbers of representatives of diverse specialist research apply increasingly sophisticated measurement methods that have not been employed in this field of science. One of the methods is IRMS (Isotope Ratio Mass Spectrometry). Tracking changes in the ratios of biogenic element isotopes is useful in eg identification and monitoring of investigated processes. Since the IRMS technique has hardly been used for investigations of the wastewater treatment process

Gli stili APA, Harvard, Vancouver, ISO e altri

31

Carpenter, Chris. "Chemical and Carbon Isotope Composition Proves Effective as Gas Diagnostic Tool." Journal of Petroleum Technology 75, no. 09 (2023): 94–96. http://dx.doi.org/10.2118/0923-0094-jpt.

Testo completo

Abstract (sommario):

_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 209992, “Gas Chemical and Carbon Isotope Composition as a Diagnostic Tool for Energy,” by Zainab Almubarak, SPE, Mohammad Alrowaie, and Feng Lu, Saudi Aramco, et al. The paper has not been peer reviewed. _ Chemical and carbon isotopic compositions of produced gases are useful tools to monitor gas production and to assess their origin, thermal maturity, and migration. In the complete paper, the authors present different geochemical approaches to assess the origin of gases and thermal maturity and

Gli stili APA, Harvard, Vancouver, ISO e altri

32

Aravena, Ramon, S. L. Schiff, S. E. Trumbore, P. J. Dillon, and Richard Elgood. "Evaluating Dissolved Inorganic Carbon Cycling in a Forested Lake Watershed Using Carbon Isotopes." Radiocarbon 34, no. 3 (1992): 636–45. http://dx.doi.org/10.1017/s003382220006392x.

Testo completo

Abstract (sommario):

Dissolved inorganic carbon (DIC) is the main acid buffer in forested lake watersheds in Canada. We used carbon isotopes (13C, 14C) to evaluate the production and cycling of DIC in an acid-sensitive lake watershed of the Precambrian Shield. Soil CO2, groundwater and stream DIC were characterized chemically and isotopically. Soil CO2 concentration profiles reflect both changes in production and in losses due to diffusion. δ13C soil CO2 profiles (δ13C values of −23‰ in summer, slightly enriched during the fall and −25%‰ during the winter) are a reflection of the isotopic composition of the source

Gli stili APA, Harvard, Vancouver, ISO e altri

33

Zhang, Wen, Wenhui Liu, Xiaofeng Wang, et al. "Formation Mechanism of Heavy Hydrocarbon Carbon Isotope Anomalies in Natural Gas from Ordovician Marine Carbonate in the Ordos Basin." Journal of Marine Science and Engineering 11, no. 11 (2023): 2176. http://dx.doi.org/10.3390/jmse11112176.

Testo completo

Abstract (sommario):

Interactive depositional systems of marine carbonates and gypsum salt rocks are closely related to natural gas reservoirs. Despite continuous progress in the exploration of new areas of marine carbonate genesis within the Ordos Basin, the source and mechanism of “sub-salt” natural gas genesis remains controversial. In this study, we investigated natural gas genesis through geochemical analysis of Lower Paleozoic natural gas samples from the mid-eastern Ordos Basin, obtaining natural gas composition data and carbon/hydrogen isotope compositions. We found evident differences between the geochemi

Gli stili APA, Harvard, Vancouver, ISO e altri

34

Cowan, Clinton A., David L. Fox, Anthony C. Runkel, and Matthew R. Saltzman. "Terrestrial-marine carbon cycle coupling in ∼500-m.y.-old phosphatic brachiopods." Geology 33, no. 8 (2005): 661–64. http://dx.doi.org/10.1130/g21434ar.1.

Testo completo

Abstract (sommario):

Abstract Carbon isotope compositions (δ13C) of inarticulate brachiopod shells from Upper Cambrian sandstone in the cratonic interior of Laurentia record a 5‰ positive excursion that correlates biostratigraphically with the global Steptoean positive isotopic carbon excursion. A consistent 6‰ negative displacement in brachiopod δ13C relative to carbonate values is interpreted to represent an onshore-offshore gradient in the isotopic composition of dissolved inorganic carbon in Cambrian seawater. Thus, these ∼500-m.y.-old chitinophosphatic brachiopod shells preserve evidence for carbon cycle coup

Gli stili APA, Harvard, Vancouver, ISO e altri

35

Sho, Kenjiro, Hiroshi Aoki Takahashi, Hiroshi Miyai, Shuichi Ikebuchi, and Toshio Nakamura. "TREE-RING WIDTH AND STABLE CARBON ISOTOPE COMPOSITION OF JAPANESE CYPRESS IN THE LAKE BIWA AREA, CENTRAL JAPAN, AND THEIR HYDROLOGIC AND CLIMATIC IMPLICATIONS." IAWA Journal 30, no. 4 (2009): 395–406. http://dx.doi.org/10.1163/22941932-90000227.

Testo completo

Abstract (sommario):

Chronologies of tree-ring width and stable carbon isotope composition of Japanese cypress were developed to help reconstruct a 300-year record of past hydrologic and climatic environments in the Lake Biwa area, central Japan. Site chronologies were built with 37 trees for ring width and four trees for carbon isotope composition, respectively. Correlation analysis with monthly climatic data revealed that radial growth of the trees is related to temperature in early spring, precipitation (or number of precipitation days) in early summer and precipitation in previous-year summer to autumn. Tree-r

Gli stili APA, Harvard, Vancouver, ISO e altri

36

Overman, Nathanael C., та Donna L. Parrish. "Stable isotope composition of walleye: 15N accumulation with age and area-specific differences in δ13C". Canadian Journal of Fisheries and Aquatic Sciences 58, № 6 (2001): 1253–60. http://dx.doi.org/10.1139/f01-072.

Testo completo

Abstract (sommario):

Stable nitrogen and carbon isotope ratios were measured for walleye (Stizostedion vitreum) collected across Lake Champlain, Vermont, to determine relationships between isotopic composition and diet, location of capture, length, weight, and age. Variation in δ13C values reflected area-specific differences in isotopic composition of organisms collected across the lake. A critical assumption in the application of isotope techniques is that a predictable relationship exists between the diet and isotopic composition of an organism. Our results indicate that isotopic fractionation factors may not be

Gli stili APA, Harvard, Vancouver, ISO e altri

37

Ivlev, A. A., and N. P. Goncharov. "Isotopic composition of blood plasma carbon in patients with endocrine diseases." Problems of Endocrinology 39, no. 1 (1993): 36–40. http://dx.doi.org/10.14341/probl11906.

Testo completo

Abstract (sommario):

Forty-eight patients suffering from diabetes mellitus, obesity, hyper- and hypothyrosis, Icenko-Cushings disease were examined to elucidate the relationship between blood plasma carbon isotopic composition and the type of the endocrine disease. This value varied within the range of 19.7 to 24.7 , the mean value being 5 . Blood plasma carbon in the diabetics is enriched for 12C light isotope (delta-13C from 23.0 to 24.5 ) as against a similar characteristic in obese patients (delta-13C from 20.5 to 21.99 ). Patients with hypo- and hyperthyrosis and the Icenko- Cushings disease have a wider rang

Gli stili APA, Harvard, Vancouver, ISO e altri

38

Popa-Lisseanu, Ana G., Stephanie Kramer-Schadt, Juan Quetglas, et al. "Seasonal Variation in Stable Carbon and Nitrogen Isotope Values of Bats Reflect Environmental Baselines." PLOS ONE 10, no. 2 (2015): e0117052. https://doi.org/10.5281/zenodo.13435561.

Testo completo

Abstract (sommario):

(Uploaded by Plazi for the Bat Literature Project) The stable carbon and nitrogen isotope composition of animal tissues is commonly used to trace wildlife diets and analyze food chains. Changes in an animal's isotopic values over time are generally assumed to indicate diet shifts or, less frequently, physiological changes. Although plant isotopic values are known to correlate with climatic seasonality, only a few studies restricted to aquatic environments have investigated whether temporal isotopic varia-tion in consumers may also reflect environmental baselines through trophic propagation. We

Gli stili APA, Harvard, Vancouver, ISO e altri

39

Popa-Lisseanu, Ana G., Stephanie Kramer-Schadt, Juan Quetglas, et al. "Seasonal Variation in Stable Carbon and Nitrogen Isotope Values of Bats Reflect Environmental Baselines." PLOS ONE 10, no. 2 (2015): e0117052. https://doi.org/10.5281/zenodo.13435561.

Testo completo

Abstract (sommario):

(Uploaded by Plazi for the Bat Literature Project) The stable carbon and nitrogen isotope composition of animal tissues is commonly used to trace wildlife diets and analyze food chains. Changes in an animal's isotopic values over time are generally assumed to indicate diet shifts or, less frequently, physiological changes. Although plant isotopic values are known to correlate with climatic seasonality, only a few studies restricted to aquatic environments have investigated whether temporal isotopic varia-tion in consumers may also reflect environmental baselines through trophic propagation. We

Gli stili APA, Harvard, Vancouver, ISO e altri

40

Popa-Lisseanu, Ana G., Stephanie Kramer-Schadt, Juan Quetglas, et al. "Seasonal Variation in Stable Carbon and Nitrogen Isotope Values of Bats Reflect Environmental Baselines." PLOS ONE 10, no. 2 (2015): e0117052. https://doi.org/10.5281/zenodo.13435561.

Testo completo

Abstract (sommario):

(Uploaded by Plazi for the Bat Literature Project) The stable carbon and nitrogen isotope composition of animal tissues is commonly used to trace wildlife diets and analyze food chains. Changes in an animal's isotopic values over time are generally assumed to indicate diet shifts or, less frequently, physiological changes. Although plant isotopic values are known to correlate with climatic seasonality, only a few studies restricted to aquatic environments have investigated whether temporal isotopic varia-tion in consumers may also reflect environmental baselines through trophic propagation. We

Gli stili APA, Harvard, Vancouver, ISO e altri

41

Popa-Lisseanu, Ana G., Stephanie Kramer-Schadt, Juan Quetglas, et al. "Seasonal Variation in Stable Carbon and Nitrogen Isotope Values of Bats Reflect Environmental Baselines." PLOS ONE 10, no. 2 (2015): e0117052. https://doi.org/10.5281/zenodo.13435561.

Testo completo

Abstract (sommario):

(Uploaded by Plazi for the Bat Literature Project) The stable carbon and nitrogen isotope composition of animal tissues is commonly used to trace wildlife diets and analyze food chains. Changes in an animal's isotopic values over time are generally assumed to indicate diet shifts or, less frequently, physiological changes. Although plant isotopic values are known to correlate with climatic seasonality, only a few studies restricted to aquatic environments have investigated whether temporal isotopic varia-tion in consumers may also reflect environmental baselines through trophic propagation. We

Gli stili APA, Harvard, Vancouver, ISO e altri

42

Popa-Lisseanu, Ana G., Stephanie Kramer-Schadt, Juan Quetglas, et al. "Seasonal Variation in Stable Carbon and Nitrogen Isotope Values of Bats Reflect Environmental Baselines." PLOS ONE 10, no. 2 (2015): e0117052. https://doi.org/10.5281/zenodo.13435561.

Testo completo

Abstract (sommario):

(Uploaded by Plazi for the Bat Literature Project) The stable carbon and nitrogen isotope composition of animal tissues is commonly used to trace wildlife diets and analyze food chains. Changes in an animal's isotopic values over time are generally assumed to indicate diet shifts or, less frequently, physiological changes. Although plant isotopic values are known to correlate with climatic seasonality, only a few studies restricted to aquatic environments have investigated whether temporal isotopic varia-tion in consumers may also reflect environmental baselines through trophic propagation. We

Gli stili APA, Harvard, Vancouver, ISO e altri

43

Kristensen, D. K., E. Kristensen, M. C. Forchhammer, A. Michelsen, and N. M. Schmidt. "Arctic herbivore diet can be inferred from stable carbon and nitrogen isotopes in C3 plants, faeces, and wool." Canadian Journal of Zoology 89, no. 10 (2011): 892–99. http://dx.doi.org/10.1139/z11-073.

Testo completo

Abstract (sommario):

The use of stable isotopes in diet analysis usually relies on the different photosynthetic pathways of C3 and C4 plants, and the resulting difference in carbon isotope signature. In the Arctic, however, plant species are exclusively C3, and carbon isotopes alone are therefore not suitable for studying arctic herbivore diets. In this study, we examined the potential of both stable carbon and nitrogen isotopes to reconstruct the diet of an arctic herbivore, here the muskox ( Ovibos moschatus (Zimmermann, 1780)), in northeast Greenland. The isotope composition of plant communities and functional

Gli stili APA, Harvard, Vancouver, ISO e altri

44

Golyshev, S. I., P. N. Sobolev, N. L. Padalko, et al. "FEATURES OF THE CARBON ISOTOPE COMPOSITION OF ORGANIC MATTER AND CARBON AND OXYGEN CARBONATE CONSTITUENT OF OIL AND GAS PRODUCING DEPOSITS OF THE CAMBRIAN OF THE SIBERIAN PLATFORM." Geology and mineral resources of Siberia, no. 2 (2023): 10–22. http://dx.doi.org/10.20403/2078-0575-2023-2-10-22.

Testo completo

Abstract (sommario):

The paper presents data on the carbon (δ13С) and oxygen (δ18О) isotopic composition of the carbonate rock constituent (CRC) and carbon (δ13C) of dispersed organic matter (SOM) of rocks of the Shumnaya, Inikan and Kuonamka Formations of the Lower-Middle Cambrian of the Siberian Platform. Dependence of the carbon and oxygen isotopic composition of CRC on the facies subtype of domanicoid deposits of the Cambrian was revealed. The interrelation of the carbon isotope composition of DOM with depositional conditions of sediments of the Lower and Middle Cambrian was considered. In the south-east of th

Gli stili APA, Harvard, Vancouver, ISO e altri

45

Hüls, C. M., H. Erlenkeuser, M.-J. Nadeau, P. M. Grootes, and N. Andersen. "Experimental Study on the Origin of Cremated Bone Apatite Carbon." Radiocarbon 52, no. 2 (2010): 587–99. http://dx.doi.org/10.1017/s0033822200045628.

Testo completo

Abstract (sommario):

Bones that have undergone burning at high temperatures (i.e. cremation) no longer contain organic carbon. Lanting et al. (2001) proposed that some of the original structural carbonate, formed during bioapatite formation, survives. This view is based on paired radiocarbon dating of cremated bone apatite and contemporary charcoal. However, stable carbon isotope composition of carbonate in cremated bones is consistently light compared to the untreated material and is closer to the δ13C values seen in C3 plant material. This raises the question of the origin of carbonate carbon in cremated bone ap

Gli stili APA, Harvard, Vancouver, ISO e altri

46

Doi, Hideyuki, Eisuke Kikuchi, Shigeto Takagi, and Shuichi Shikano. "Spatio-temporal stable isotope variation of a benthic primary consumer in a simple food web in a strongly acidic lake." PeerJ 7 (October 11, 2019): e7890. http://dx.doi.org/10.7717/peerj.7890.

Testo completo

Abstract (sommario):

Analysis of aquatic food webs is typically undertaken using carbon and nitrogen stable isotope composition of consumer and producer species. However, the trophic consequences of spatio-temporal variation in the isotope composition of consumers have not been well evaluated. Lake Katanuma, Japan, is highly acidic and has only one dominant species of benthic alga and one planktonic microalga, making it a prime system for studying trophic relationships between primary consumers and producers. In this simple lake food web, we conducted a field survey to evaluate spatial and temporal variation in th

Gli stili APA, Harvard, Vancouver, ISO e altri

47

Dobrovolskaya, Maria, Natalia Svirkina, Sergey Yazikov, and Alexey Sviridov. "The Lifestyle of Children and Adults in the Barbarian Environ of Chersonesos (Based on Materials from Frontovoe 3 and Kil-Dere 1 Necropolises)." Stratum plus. Archaeology and Cultural Anthropology, no. 4 (August 29, 2023): 139–54. http://dx.doi.org/10.55086/sp234139154.

Testo completo

Abstract (sommario):

The necropolises Frontovoe 3 and Kil-Dere 1 from the environ of Chersonesos are interesting and important for the reconstruction of the cultural and historical situation on the borders of the Roman Empire. Data on the isotopic composition of bone collagen and tooth enamel provide new opportunities to discuss the nutrition, economy, and mobility of societies. The isotope composition of carbon and nitrogen informs about the average dietary intake of an individual over the last few years of life (7—10), while the ratio of strontium isotopes in tooth enamel characterizes the habitat of the child d

Gli stili APA, Harvard, Vancouver, ISO e altri

48

Zhuravlev, Andrey. "Numerical modelling of primary bioproductivity of the Palaeozoic pelagic ecosystems." Vestnik of geosciences, no. 8 (November 10, 2022): 38–43. http://dx.doi.org/10.19110/geov.2022.8.4.

Testo completo

Abstract (sommario):

The article considers an approach to the reconstruction of the bioproductivity of Palaeozoic pelagic ecosystems based on the numeric modelling of the carbon isotope fractionation. The model uses information on the carbon dioxide content in atmosphere, water temperature, and carbon isotopic composition of carbonates and conodont elements. The developed model is tested on the material from the Upper Devonian — Lower Carboniferous of the northern Cis-Urals (successions of carbonate platform and slope of intrashelf depression). It allows reconstructing of the primary productivity of the Palaeozoic

Gli stili APA, Harvard, Vancouver, ISO e altri

49

Kelly, Jeffrey F. "Stable isotopes of carbon and nitrogen in the study of avian and mammalian trophic ecology." Canadian Journal of Zoology 78, no. 1 (2000): 1–27. http://dx.doi.org/10.1139/z99-165.

Testo completo

Abstract (sommario):

Differential fractionation of stable isotopes of carbon during photosynthesis causes C4 plants and C3 plants to have distinct carbon-isotope signatures. In addition, marine C3 plants have stable-isotope ratios of carbon that are intermediate between C4 and terrestrial C3 plants. The direct incorporation of the carbon-isotope ratio (13C/12C) of plants into consumers' tissues makes this ratio useful in studies of animal ecology. The heavy isotope of nitrogen (15N) is preferentially incorporated into the tissues of the consumer from the diet, which results in a systematic enrichment in nitrogen-i

Gli stili APA, Harvard, Vancouver, ISO e altri

50

VOIGT, SILKE. "Stable oxygen and carbon isotopes from brachiopods of southern England and northwestern Germany: estimation of Upper Turonian palaeotemperatures." Geological Magazine 137, no. 6 (2000): 687–703. http://dx.doi.org/10.1017/s0016756800004696.

Testo completo

Abstract (sommario):

More than 190 articulate brachiopods from Turonian sections in northwestern Germany and southern England were studied for their stable carbon and oxygen isotopic composition, and some of them for their elemental composition. Most of the brachiopod shells are well preserved, and oxygen isotope composition reflects the temperate conditions of the European epicontinental sea. Upper Turonian mean δ18O values from Lower Saxony and southern England show bottom-water temperatures in the range of 14.2 to 18.2 °C (δ18Ow = −1.5‰ SMOW for an ice-free world). The relative trend of mean brachiopod oxygen a

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!