Organic matter nitrogen isotopes. Medical search. Frequent questions

They play an important role in nutrient cycling due to their unrivalled capacity for processing both dissolved and particulate organic matter (DOM and POM) and the exceptional metabolic repertoire of their diverse and abundant microbial communities. (datadryad.org)
From these values, incoporation rates of dissolved and particulate organic matter are derived, which are provided in the main text and supplementary materials. (datadryad.org)
The temporal, spatial and depth related variation of suspended particulate organic matter (POM) in the Bay of Bengal are assessed in this paper. (nio.res.in)
This dataset contains data for stable carbon and nitrogen isotope values of particulate organic matter (POM) collected from the Conductivity Temperature Depth (CTD) rosette. (ucar.edu)
Infiltration of river water into riverbeds can deliver particulate organic matter (POM: the remains of plants, algae, and other life), which has an important role for transforming nutrients in watersheds. (uwaterloo.ca)

A significant variation in the stable carbon and nitrogen isotope compositions between fluvial and marine deposits was recorded. (gov.pl)

The isotopic δ 13 C%, δ 15 N% values, organic carbon (OC) and total nitrogen contents, and atomic C/N ratios are used as evidence of depositional environment. (gov.pl)
collected from nonpolluted northwest coast was higher as compared to the average δ15N contents (8.0‰ air) of Ulva from the Manora Channel, suggesting that nitrogen isotopic ratios of Ulva spp. (intechopen.com)
While traditional stable isotope analyses of tooth enamel (e.g., carbon and oxygen) and trace element ratios (e.g. (blueskytccaalibaba.com)
Our proposal is to build a completely new combination of instrumentation, linking existing thermal analysis and stable isotope instrumentation via a novel interface that is capable of taking different N gases from the thermal analysis machine (which gives a continuous record of weight loss, hence proportions of discrete components) and presenting them to the isotope ratio mass spectrometer for determination of N isotope ratios. (ukri.org)
2) chemical compositions of gases which relate to N's chemical environment within each pool, and 3) N isotope ratios for each pool. (ukri.org)
It offers a novel tool to track N in soil systems, quantifying specific real pools with differing stability, constraining the chemical host for N within soil organic matter and using N isotope ratios (testing both natural abundances and labelled materials) to observe turnover of pools with differing stabilities. (ukri.org)
Korean mariculture Undaria pinnatifida was collected during the months of January, February, March, and December of 2010, as well as from January of 2011 to investigate the changes in the carbon and nitrogen stable isotope ratios (δ 13 C and δ 15 N) and heavy metal with respect to it growth and to identify the factors that influence such changes. (e-algae.org)
I combine NO3- isotope ratios with nitrous oxide (N2O) isotope measurements to identify the origin of the pronounced N-deficit and N2O supersaturation prevalent in deep Baffin Bay. (dal.ca)
In chapter 4, I use NO3- isotope ratios measured in the Canada Basin and in the Baffin Bay together with hydrographic data and nutrient ratios as a baseline to evaluate the distribution of Pacific- and Atlantic-derived water masses throughout the Arctic Archipelago. (dal.ca)
Changes of soil (a) organic carbon and (b) soil nitrogen concentrations, (d, e) their stocks, their stable isotope ratios (f) δ 13 C and (g) δ 15 N values, as well as the (c) carbon-to-nitrogen ratio (C/N ratio) at different soil depth compartments (0-10 cm, 10-40 cm, 40-100 cm) during three soil sampling periods. (the-jena-experiment.de)

In this study, we show that the nitrogen isotope composition of organic matter preserved in mammalian tooth enamel (δ 15 N enamel ) records diet and trophic position. (blueskytccaalibaba.com)
Here, we leveraged one of the longest running prescribed burn experiments (established in 1964) to evaluate how fire frequency and changing vegetation composition influenced wood stable N isotopes (δ15N) across space and time. (umn.edu)
Identifying the controls on organic carbon preservation requires an improved understanding of the composition and distribution of organic carbon within deep oligotrophic marine sediments. (whoi.edu)
X-ray imaging and spectroscopic analyses reveal that the chemical composition of this old, deep organic carbon is dominated (40-60%) by amide and carboxylic carbon with a proteinaceous nature. (whoi.edu)
Internal water temperature, pH and H/D isotope composition. (lu.se)

By analyzing them, researchers can determine a compound's isotopic signature, the unique ratio of various isotopes that serve as a fingerprint. (naturalnews.com)
In the last decade, extensive sampling of Arctic Ocean waters on international research expeditions found a fingerprint of Pacific influence on the nutrient nitrogen in the Arctic Ocean. (arcus.org)
Second, we needed a way to assess this Pacific nitrogen fingerprint back in time. (arcus.org)

Center: The sediments are composed of thousands of microscopic rounded fossils created by zooplankton that preserve nitrogen from the time when they lived. (arcus.org)
Nitrogen isotope values are often as low as −3‰ and are typically less than +2‰, even in relatively organic matter-lean sediments. (syr.edu)

He and his research team studied the oxygen isotopes in the matter. (naturalnews.com)
The UoM research team took accurate measurements and interpretations of the oxygen isotopes that made up the organic matter in the space rocks. (naturalnews.com)
However, oxygen isotopes have two advantages over their hydrogen and nitrogen counterparts. (naturalnews.com)
This veritable wealth of oxygen isotopes provides more information about the origin of organic material in chondrites. (naturalnews.com)
Tartèse reported that the three oxygen isotopes formed a pattern that resembled the ones found in the Sun, asteroids, and rocky planets . (naturalnews.com)
In this respect, my thesis examines how biochemical and physical processes regulate the distribution of different nitrogen (N) species and their transformation in various marine environments by evaluating the spatial distribution of nitrogen and oxygen isotopes of nitrate (NO3-), in combination with a varying set of complementary biogeochemical tracers. (dal.ca)

The characterization of Neandertals' diets has mostly relied on nitrogen isotope analyses of bone and tooth collagen. (mpg.de)
We return to our previous questions to find new answers with the help of osteological methods - DNA and isotope analyses", says Torbjörn Ahlström, Professor of Historic Osteology. (lu.se)

Symbiotic nitrogen- (N) fixing trees can influence multiple biogeochemical cycles by fixing atmospheric N, which drives net primary productivity and soil carbon (C) and N accumulation, as well as by mobilizing soil phosphorus (P) and other nutrients to support growth and metabolism. (usgs.gov)
One of the important limiting factors of growing crops and their productivity is the maintenance of soil fertility, as any cropping also results in soil depletion by removal of the essential minerals such as nitrogen, phosphorus and potassium, and also by breakdown of organic matter necessary for its fertility. (springer.com)
Specific nutrients are Carbon, Nitrogen, Phosphorus and. (ucar.edu)
2001) reported a method for diazinon identification and quantification in human blood using SPE, GC-nitrogen phosphorus detection (NPD) analysis followed by GC-MS confirmation. (cdc.gov)

Nitrogen plays a central role in marine biogeochemistry. (dal.ca)

To provide a detailed reconstruction of coastal marine ecosystem change over the Holocene and study its linkages to climate and terrestrial freshwater inputs, organic-walled palynomorphs (including e.g. dinoflagellate cysts and pollen) and some basic geochemistry (including e.g. total organic carbon, C:N ratio, biogenic silica and stable isotopes of carbon and nitrogen) were examined from two radiometrically dated sediment cores from Young Sound fjord, Northeast Greenland. (helsinki.fi)
Suspended sediment (SS) and organic matter in rivers can harm brown trout Salmo trutta by affecting the health and fitness of free swimming fish and by causing siltation of the riverbed. (egu.eu)
The temporal and spatial dynamics of sediment, carbon (C), and nitrogen (N) during the brown trout spawning season in a small river of the Swiss Plateau were assessed and C isotopes as well as the C/N atomic ratio were used to distinguish autochthonous and allochthonous sources of organic matter in SS loads. (egu.eu)
Sediment microbes have a great potential to transform reactive N to harmless N2, thus decreasing wastewater nitrogen load into aquatic ecosystems. (jyu.fi)
Using 3D simulation, we demonstrated that the sediment diffusion method enhanced the contact time and amount of wastewater near the sediment surface especially in spring and in autumn, altering organic matter concentration and oxygen levels, and increasing the denitrification capacity of the sediment. (jyu.fi)
2019. Spectroscopic windows in to the persistence of organic carbon in oxygenated marine sediment. (whoi.edu)
We posit that organic carbon persists in oxic oligotrophic sediment through a combination of protective processes that involve adsorption to mineral surfaces and physical inaccessibility to the heterotrophic community. (whoi.edu)
We estimate that up to 1.6 × 10 22 g of organic carbon are sequestered on million-year timescales in oxic pelagic sediment, which exceeds current estimates of the total global sediment organic carbon and constitutes an important, previously overlooked carbon reservoir. (whoi.edu)

Therefore, we coupled pulse-chase isotopic tracer techniques with nanoscale secondary ion mass spectrometry (NanoSIMS) to visualise the uptake and translocation of 13 C- and 15 N-labelled dissolved and particulate organic food at subcellular level in the high microbial abundance sponge Plakortis angulospiculatus and the low microbial abundance sponge Halisarca caerulea. (datadryad.org)

This relationship suggests that the activity and ecology of ammonia oxidizing Thaumarchaeota and the δ 15 N of dissolved inorganic nitrogen utilized by primary producers are linked. (syr.edu)

Based on the extremely low δ66Zn value observed in the Neandertal's tooth enamel, our results support the interpretation of Neandertals as carnivores as already suggested by δ15N isotope values of specimens from other regions. (mpg.de)

Here we evaluate nitrogen isotope variability during a relatively quiescent phase of the Late Cretaceous Greenhouse, between Oceanic Anoxic Events 2 and 3, using the black shales of Demerara Rise (DR). Selection of this site allows us to isolate some of the factors that control nitrogen cycle dynamics and contribute to low nitrogen isotope values. (syr.edu)
In subsoils, mainly the presence of specific plant functional groups drove organic matter dynamics. (the-jena-experiment.de)

A method for determining the 18O/16O ratio of organic matter composed of carbon, hydrogen, oxygen, and nitrogen is described. (eurekamag.com)
Earlier studies targeted the isotopes of hydrogen and nitrogen. (naturalnews.com)
Whereas both hydrogen and nitrogen have two, oxygen has three stable isotopes . (naturalnews.com)
Stable isotopes of carbon (δ13C), sulfur (δ34S), oxygen (δ18O), hydrogen (δ2H), nitrogen (δ15N), and radioactive isotope of hydrogen (tritium) have been applied in combination with conventional techniques (chemical) to investigate Karachi coastal water pollution due to Layari and Malir rivers, which mainly carry the domestic and industrial wastewater of Karachi Metropolitan. (intechopen.com)

Three Neogene sedimentary formations reflecting different depositional environments have been investigated for the purpose of diagnosing the isotopic source of the sedimentary organic matter and their palaeoenvironmental significance in discriminating between marine and terrestrial environments. (gov.pl)
The δ 13 C, δ 15 N and C/N values indicate that the organic matter in the Euphrates Formation is of marine origin, whereas it is of terrestrial origin (fluviatile) in the Injana and Dibdibba formations. (gov.pl)
the shallow-marine environment (Euphrates Formation) was characterized by a low C/N ratio (9) due to the algal-derived organic matter with limited input of terrestrial organic matter. (gov.pl)
Pacific salmon acquire most of their biomass in the ocean before returning to spawn and die in coastal streams and lakes, thus providing subsidies of marine‐derived nitrogen (MDN) to freshwater and terrestrial ecosystems. (usgs.gov)
The results indicate that the near-shore marine ecosystem in Young Sound is clearly influenced by local forcings, such as terrestrial freshwater and organic matter inputs, during the Holocene. (helsinki.fi)
In contrast, the nitrogen (N) isotope ratio of organic material (expressed as δ 15 N vs. AIR in ‰, where δ 15 N = [( 15 N/ 14 N sample / 15 N/ 14 N reference ) − 1] × 1000) derived from bulk tissues or specific compounds (e.g., amino acids) is a widely used proxy for the dietary and trophic behavior of animals in terrestrial and marine food webs. (blueskytccaalibaba.com)

Full-scale experiments were set on two Finnish lake sites, Keuruu and Petäjävesi, and effects on the nitrate removal processes were studied using the stable isotope pairing technique. (jyu.fi)

Elemental (Total Organic Carbon TOC and Total Organic Nitrogen), isotopic (C and N), pollen analysis and radiocarbon dating were integrated on this work. (usp.br)

This dataset describes foliar and soil chemistry and isotopes for six tree species in Tillamook State Forest, 2015. (usgs.gov)

Anthropogenic alteration of the form and concentration of nitrogen (N) in aquatic ecosystems is widespread. (usgs.gov)

abstract = "Great attention has been paid to the origin of anomalously low nitrogen isotope values during the Late Cretaceous. (syr.edu)

With this work, I highlight the importance and applicability of dual isotope measurements as water mass tracers and provide insights into individual processes within the N cycle. (dal.ca)

Despite the potential of nitrogen isotopes for trophic reconstruction, their application in the paleontological record has been limited due to the poor preservation of N-containing organic matter. (blueskytccaalibaba.com)
Zinc isotopes have been shown to be a reliable method for reconstructing trophic levels in the absence of organic matter preservation. (mpg.de)

New N-isotope measurements from ODP Site 1259 reveal δ 15 N values that range from +0.2‰ to −3.5‰ and oscillate by 1.5‰ to 3‰ over 1.6 million years (Ma). (syr.edu)

The last tab contains bulk stable isotope data (from EA-IRMS) from the sponges used in the experiment. (datadryad.org)
In each case, the bulk chemistry of the organic matter differs, with implications for the chemistry and availability of N. In reactive SOM, amine N is readily available for mineralisation. (ukri.org)

We investigated how plant diversity impacted soil organic carbon and nitrogen concentrations and stocks and their stable isotopes 13 C and 15 N, as well as how these effects changed after 5, 10, and 14 years. (the-jena-experiment.de)

13C by isotope ratio mass spectrometry. (cdc.gov)

Translocation of carbon and nitrogen from choanocytes to microbial symbionts occurred over time, irrespective of microbial abundance, reflecting recycling of host waste products by the microbiome. (datadryad.org)

Functional studies determining the role of host and microbiome in organic nutrient uptake and exchange, however, are limited. (datadryad.org)

Differing soil organic matter pools have different stabilities, and so N in soils rich in reactive soil organic matter (SOM) is much more rapidly mineralised than that in soils with stable SOM. (ukri.org)

The organic matter in bone and dentin is, as a result, susceptible to diagenetic alteration, particularly in unfavorable depositional contexts (e.g., humid environments and acidic soils). (blueskytccaalibaba.com)
This system will provide for the first time a tool to investigate chemical and natural/labelled isotopic heterogeneity for N within soil organic matter, enabling N turnover models to be related to measurable parameters from agricultural soils. (ukri.org)
My present research focuses on examining the molecular mechanisms underlying the decomposition of organic matter by ectomycorrhizal and saprotrophic fungi and how this activity affect the cycling of nutrients and carbon in forest soils. (lu.se)

This proposal is to build a UNIQUE interface to take gases from the thermal analysis system, separating evolved N species and preparing them for N isotope analysis. (ukri.org)
what is novel is its ability to deal with reduced and oxidised N species simultaneously, and hence to deliver N isotope data for naturally heterogeneous materials. (ukri.org)

A biosignature (sometimes called chemical fossil or molecular fossil) is any substance - such as an element, isotope, or molecule - or phenomenon that provides scientific evidence of past or present life. (wikipedia.org)
In general, biosignatures can be grouped into ten broad categories: Isotope patterns: Isotopic evidence or patterns that require biological processes. (wikipedia.org)

Organic N, within dead plant tissue or other biological products, is not available for plant uptake until it has been mineralised. (ukri.org)

We have developed a globally unique instrumental system, that takes gases evolved during combustion for both chemical and isotopic analysis (C, O). This allows us to discriminate C pools, to demonstrate that C isotopic heterogeneity naturally present in plant tissue disappears during decomposition, and to distinguish carbonate C and organic C in mixtures that cannot be separated physically. (ukri.org)
For example, the presence of deep-rooting tall herbs decreased carbon concentrations, most probably through stimulating soil organic matter decomposition. (the-jena-experiment.de)
We study the biochemical and molecular mechanisms that fungi use to cause organic matter transformation and decomposition focusing both on intact tissues such as wood, but also processed molecules such as soil organic matter. (lu.se)

Before the introduction of chemical fertilisers, the nutrients lost through the harvest were replaced by additional organic matter either from manure, or from humus regeneration during fallow phases. (springer.com)
Based on isotope data and water mass mixing estimates, I highlight the different biogeochemical histories of nutrients feeding the northern and southern WEP, and provide support for the theory of a predominantly Southern Ocean source of NO3- to the EUC. (dal.ca)
NO3- isotopes reflect substantial in situ remineralization of organic matter originating from surface productivity fueled by Pacific-derived nutrients, whereas N2O isotopomer abundances point to sedimentary denitrification as a potential source of the N-deficiency observed in the deep basin. (dal.ca)
We want to understand how microorganisms regulate the mineralization of carbon and nutrients from soil organic matter, both under steady-state conditions and during dynamic perturbations (for example drying-rewetting). (lu.se)

however, their application in the fossil record is severely limited by degradation of organic material during fossilization. (blueskytccaalibaba.com)
This fossil organic matter contains abundant nitrogen, and its nitrogen-15 excess was measured over the last 50,000 years. (arcus.org)
Right: The fossil nitrogen is extracted and its nitrogen-15 ratio measured using chemical techniques. (arcus.org)

Here, we present the results of zinc (Zn), strontium (Sr), carbon (C), and oxygen (O) isotope and trace element ratio analysis measured in dental enamel on a Pleistocene food web in Gabasa, Spain, to characterize the diet and ecology of a Middle Paleolithic Neandertal individual. (mpg.de)

Zinc Isotope Data. (mpg.de)

However, few nitrogen isotope data have been recovered from bones or teeth from Iberia due to poor collagen preservation at Paleolithic sites in the region. (mpg.de)

Our results indicate that after changing the soil system the pathways of organic matter transfer to the subsoil need time to establish. (the-jena-experiment.de)

Organic matter: Organics formed by biological processes. (wikipedia.org)
Quantifying human impacts on the nitrogen (N) cycle and investigating natural ecosystem N cycling depend on the magnitude of inputs from natural biological nitrogen fixation (BNF). (usgs.gov)
Life likes lighter isotopes, so if you have a light signature in these minerals then it looks biological," said lead author Dr David Wacey from the University of Western Australia. (universetoday.com)

Nitrogen has two stable isotopes, the abundant nitrogen-14 and the rare nitrogen-15. (arcus.org)

It contains extracted values from NanoSIMS data, which gives the Atom% carbon and nitrogen from different cells of interest in sponge tissue over time. (datadryad.org)
Carbon and Oxygen Isotope Data. (mpg.de)

Volatile organic compounds (VOCs) are ubiquitous in the environment. (cdc.gov)

To do so, we typically employ a range of isotope-based approaches which allow us to examine the microbial use and transformations of carbon and nitrogen in soil systems. (lu.se)

Stable isotopes revealed that these increases were associated with new plant-derived inputs, resulting in less processed and less decomposed soil organic matter. (the-jena-experiment.de)

They also display pyrite content, but there's no "fool's gold" here in these light isotopes… it's a metabolic by-products of the cells. (universetoday.com)

In their new study, they reported that organic materials found in those non-metallic meteors were formed by basic chemical processes during the formation of the Solar System. (naturalnews.com)
In addition to showing that basic chemical processes in our solar system can create organic materials, their study indicates that these same processes and results could also take place in other planetary systems. (naturalnews.com)

A single fire event often increases short-term nitrogen (N) availability to individual plants, but repeated burning causes ecosystem carbon and N losses and can ultimately decrease soil organic matter and N availability. (umn.edu)

Anatomy1

Chemicals and Drugs13

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Phenomena and Processes10

Disciplines and Occupations1

Humanities1

Health Care6

Particulate organic matter5

Carbon and nitrogen isotope1

Ratios10

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Fingerprint3

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Inorganic nitrogen1

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