Stable isotopes abundance isotopes. Medical search. Frequent questions

We offer stable isotope analyses mostly for scientific research projects. (luomus.fi)
We point out fields of research in ant biology that can be explored more extensively with stable-isotope analyses. (uni-bayreuth.de)
Methods will combine stable isotope analyses and passive video camera recordings. (saveourseas.com)
We performed geochemical (elemental abundance and stable Si isotopes, δ30Si) and microscopic (X-ray diffraction and scanning electron microscope) analyses to monitor leaching efficiency in separating different Si phases. (lu.se)

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)
Some of the atoms of certain isotopes are unstable because of the extra number of neutrons, and they are said to be radioactive. (onlinemathlearning.com)
Artificial radioactive isotopes of selenium have also been created by neutron activation. (cdc.gov)
Magnesium 24 Metal (Magnesium-24) is a stable (non-radioactive) isotope of Magnesium. (americanelements.com)
in early 2019, the system has been deployed with GRETINA for a campaign of measurements using stable, re-accelerated and in-flight radioactive beams at ATLAS at ANL for understanding nova and r-process nucleosynthesis. (aps.org)
When used in conjunction with radioactive ion beams in inverse kinematics, the surrogate reactions method (SRM) can inform neutron capture cross sections on isotopes of interest to the r process. (aps.org)

Fluorine-20 is an unstable isotope of fluorine. (wikipedia.org)
But consider another (imaginary) stable isotope - call it X - which requires more kinetic energy for its creation and is also more unstable to photodissociation. (stackexchange.com)
As far as I know, all elements without data on natural abundance there are unstable. (stackexchange.com)
begingroup$ @MartinKochanski: Technically, yes, this quote does not fully eliminate stable isotopes not occurring in nature (although it does touch the question, at least in the part related to the 24 synthetic elements not occurring in nature: if an element is unstable, that means all its isotopes are unstable). (stackexchange.com)
Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with nonzero quantum numbers. (iupac.org)

Naturally occurring isotopes (tritium, carbon-13, carbon-14 [abundance], stable isotopes of hydrogen and oxygen in water, stable isotopes of nitrogen and oxygen in nitrate, chlorine-37, and bromine-81), and dissolved noble gases also were measured to help identify the source and age of the sampled ground water. (usgs.gov)
The experts used the stable isotopes nitrogen-15 and carbon-13 to identify sources of N 2 O and CO 2 emission, as well as to study the accumulation of carbon and nitrogen under different land uses (see Tracking greenhouse gases with stable isotopes) . (iaea.org)

Of particular interest is the unambiguous detection and measurement of the nitrogen-15 isotope. (eso.org)

This laboratory contains air flasks waiting to be sampled, a wall lined with tanks of standards, large metal containers of liquid nitrogen, and computers showing graphs of carbon isotope ratios. (noaa.gov)
In order to gain the best possible insight into the origins and formation of the niche in which we live, it is therefore important to determine such isotopic abundance ratios in as many members of the solar family as possible. (eso.org)
The information given includes quantum numbers, isotopic abundances, magnetic moments, magnetogyric ratios and receptivities, together with quadrupole moments and line-width factors where appropriate. (iupac.org)

Isotopes are atoms of the same element that have different number of neutrons. (onlinemathlearning.com)
is an isotope of chlorine that has 17 protons and 18 neutrons. (onlinemathlearning.com)
is an isotope of chlorine that has 17 protons and 20 neutrons. (onlinemathlearning.com)
Isotopes are versions of an atom or an element that have the same number of protons, but different numbers of neutrons. (onlinemathlearning.com)
In isotope notation, you can quickly show how many protons, neutrons, and electrons are in an atom. (onlinemathlearning.com)
Isotope notation is particularly important in nuclear chemistry, because if you're doing fission, fusion, alpha decay, beta decay, positron emission, or electron capture, you want to be able to tell how many neutrons and protons are in the nucleus. (onlinemathlearning.com)
Carbon-12, with 6 protons and 6 neutrons, is the isotope that used to define one mole. (visionlearning.com)

New metabolomics applications of ultra-high resolution and accuracy mass spectrometry can provide thousands of detectable isotopologues, with the number of potentially detectable isotopologues increasing exponentially with the number of stable isotopes used in newer isotope tracing methods like stable isotope-resolved metabolomics (SIRM) experiments. (mdpi.com)
The combination of high-resolution LC-MS-based untargeted metabolomics with stable isotope tracing provides a global overview of the cellular fate of precursor metabolites. (acs.org)

2021) coupled to isotope-ratio mass spectrometers.Empty cells = not determined. (openaire.eu)

The values of natural abundance of stable isotopes were measured in 22 species of macrophytes (18 macroalgae and 4 vascular plants) collected from the intertidal domain in NW Spain (NE Atlantic). (openaire.eu)
This study investigates natural variation in C and N stable isotopes among plant species in two western Amazon flooded forests with contrasting watershed biogeochemistry (white-water várzea-forest and black-water igapó-forest). (scielo.br)
Using an array of state-of-the-art methodologies such as camera traps, RFID and GPS trackers, stable isotopes or molecular sequencing, GCC monitors species behaviour, movements and abundance. (helsinki.fi)
We conclude that a successful separation of Si phases in diagenetically modified sediments relies on the knowledge of elemental abundance and even δ30Si values of the leachates, as well as information such as species of Si-skeleton organisms, contents and maturation degree of biogenic silica. (lu.se)

Bromine has two isotopes, Br-79 and Br-81. (onlinemathlearning.com)
The stable isotope of bromine with relative atomic mass 78.918338, 50.69 atom percent natural abundance and nuclear spin 3/2. (ebi.ac.uk)

This dataset contains the values of natural abundance of stable carbon and nitrogen isotopes in bulk samples and of nitrogen isotopes in amino acids. (openaire.eu)
Contains experimentally-derived protein half-life data obtained using stable isotope labeling by amino acids (SILAC) coupled with mass spectrometry. (yeastgenome.org)

Fishes are often utilised in aquatic isotope studies as they structure ecosystems and communities that matter to people, and can cause top-down effects (Kishi et al. (springer.com)

Stable isotope turnover rates represent the change in mass and/or time required for consumer tissues to reflect their new diet, allowing the calculation of an isotopic half-life for the tissue and isotope of interest (Boecklen et al. (springer.com)
In these lessons, we will learn about Isotopes, Isotope Notation, Atomic Mass Unit (amu), and how to calculate the Atomic Mass of an element. (onlinemathlearning.com)
The following diagrams show the isotopes of chlorine and how to calculate the relative atomic mass. (onlinemathlearning.com)
In this video, we'll learn about what isotopes are and how to write atomic number and mass number in isotope notation. (onlinemathlearning.com)
How do you determine and calculate isotope abundance when you know the relative atomic mass (also known as atomic weight), as measured in amu or atomic mass numbers? (onlinemathlearning.com)
If the relative atomic mass of chlorine is 35.45, what is the abundance of each isotope? (onlinemathlearning.com)
The mass isotope ratio, 58Fe/57Fe (MIR58/57), was measured in blood by inductively coupled plasma mass spectroscopy before and 14 days after (i.e. study day 15) consuming the three lunches. (unboundmedicine.com)
Spock is a highly precise isotope ratio mass spectrometer , which uses a magnetic field to separate and measure molecules of different masses (a measure of how much matter is in an object) by bending ions of different charges at different radii. (noaa.gov)
Additionally, CO 2 containing an 18 O instead of 16 O oxygen isotope has mass 46. (noaa.gov)
The isotopologues measured during stable isotope carbon dioxide mass spectrometry along with their relative abundances in the atmosphere. (noaa.gov)
Fragmentation of PFB-fatty acid esters using negative chemical ionization (NCI) resulted in a reproducible loss of the PFB moiety giving a stable carboxylate anion (mass minus 1 amu). (cdc.gov)
13C by isotope ratio mass spectrometry. (cdc.gov)

Selenium reacts with oxygen to form a number of oxides, the most stable of which is selenium dioxide. (cdc.gov)
Spock is specifically designed for a much narrower purpose: to examine carbon (and oxygen) isotopes in atmospheric carbon dioxide. (noaa.gov)
At its 2009 meeting in Vienna, the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) resolved to express the standard atomic weight of ten elements - including hydrogen, carbon, and oxygen - by means of intervals that characterize the span of their atomic-weight values in so-called "normal" materials. (degruyter.com)

Several of the available proxies for reconstructing methane cycle changes of lakes rely on interpreting past changes in the abundance or relevance of methane oxidizing bacteria (MOB), either directly (e.g. via analysis of bacterial lipids) or indirectly (e.g. via reconstructions of the past relevance of MOB in invertebrate diet). (diva-portal.org)
However, only limited information is available about the extent to which, at the ecosystem scale, variations in abundance and availability of MOB reflect past changes in in-lake methane concentrations. (diva-portal.org)
We present a study examining the abundances of fatty acids (FAs), particularly of C-13-depleted FM known to be produced by MOB, relative to methane concentrations in 29 small European lakes. (diva-portal.org)
39 surface sediment samples were obtained from these lakes and FA abundances were compared with methane concentrations measured at the lake surface, 10 cm above the sediments and 10 cm within the sediments. (diva-portal.org)
We observed positive relationships between methane concentrations and relative abundances of C-16:1 omega 7c, C-16:1 omega 5c/t, and C-18:1 omega 7c and the sum of these FAs. (diva-portal.org)
The abundance and methane oxidation activity of Methylocystis spp. (lancs.ac.uk)

Spock measures these relative concentrations of the three main carbon dioxide isotopologues (molecules of the same material but with different isotopes in them) with molecular masses of 44, 45, or 46 within each air sample. (noaa.gov)

Learn how to write atoms in isotope notation! (onlinemathlearning.com)
Yes, there are isotopes which would be stable if any atoms of them existed, and we can make them in the laboratory, but conditions in nature have never led to them being created. (stackexchange.com)

In brief, a 100µL plasma sample was spiked with 100µL of a mixture of 11 internal standards (fatty acids labeled with stable isotopes) to account for recovery. (cdc.gov)
In some segments enhanced detector sensitivity was used to quantitate low abundance fatty acids. (cdc.gov)

Mucus isotope data differed significantly and predictively from muscle data. (springer.com)
Protein abundance data, domains, shared domains with other proteins, protein sequence retrieval for various strains, sequence-based physico-chemical properties, protein modification sites, and external identifiers for the protein. (yeastgenome.org)
This section also contains protein abundance data for both untreated and treated cells obtained from over 20 studies. (yeastgenome.org)
EDIT(06/07/2016): see also the table of natural abundance of stable nuclides at https://www.ncsu.edu/chemistry/msf/pdf/IsotopicMass_NaturalAbundance.pdf (if an element does not have stable nuclides, they give data for the longest-living isotope). (stackexchange.com)
Gather abundance, behavioural and individual data on lemon sharks using video cameras. (saveourseas.com)
The high quality of the data obtained of this moving 9th-magnitude object has permitted a determination of the cometary abundance of various elements and their isotopes [2] . (eso.org)

We determined cyanate consumption in a grassland and rice paddy soil using stable isotope tracer experiments. (aau.dk)

In 2009, the Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC) introduced the interval notation to express the standard atomic weights of elements whose isotopic composition varies significantly in nature. (degruyter.com)
Stable isotope composition (delta(13)C and delta(15)N) of moose (Alces alces) and caribou (Rangifer tarandus) hair from the boreal forest of Jacques-Cartier Park and Cote-Nord (Quebec) and arctic tundra of Queen Maud Gulf and Southampton Island (Nunavut) was investigated as an indicator of dietary preferences and habitat use. (nih.gov)

Este estudio investiga la variación natural en isótopos estables de C y N entre especies de plantas en dos bosques inundables de la Amazonía noroccidental con biogeoquímica de cuenca contrastantes (várzea-bosques de aguas blanca e igapó-bosques de aguas negras). (scielo.br)
Radiocarbon, stable isotopic and luminescence techniques provide tools to quantify and characterize natural and manmade samples ranging from last glacial era to Anthropocene. (luomus.fi)
We accept only natural abundance samples for analysis, i.e. isotopically labelled substances are not accepted for analysis. (luomus.fi)
Natural-abundance-stable-isotope studies are a useful tool for assessing the trophic position of ants in food webs. (uni-bayreuth.de)
Because of reluctance to use radioisotopes for studies of iron absorption in children, we have explored the feasibility of using the least abundant stable isotope of iron, 58Fe (natural abundance, 0.322 weight %) in a study of nonheme iron absorption. (unboundmedicine.com)
These distributions, however, are not intended to reflect the natural variability of the abundances of the different isotopes in the earth's crust or in any other environment. (degruyter.com)

Modes of decay: Bold symbol as daughter - Daughter product is stable. (wikipedia.org)
It undergoes beta decay as well, decaying to 21 Ne , which is a stable nuclide. (wikipedia.org)

We provide an estimate of the enrichment of stable isotopes relative to a chemically defined diet for the ant Camponotus floridanus (BUCKLEY, 1866) and show that their endosymbiotic bacteria do not significantly alter the enrichment process. (uni-bayreuth.de)

This project aims to investigate the effect of provisioning on the feeding ecology, abundance and habitat use patterns of sicklefin lemon sharks in the waters surrounding Moorea, French Polynesia. (saveourseas.com)

Are there stable isotopes which do not occur in nature? (stackexchange.com)

Here we present an overview of topics and questions that can be addressed using stable-isotope methods. (uni-bayreuth.de)
We discuss experi-mental design, sampling methods and potential pitfalls when applying stable-isotope techniques. (uni-bayreuth.de)

For more information and instructions for samples, see stable isotope determinations . (luomus.fi)
Lately though, NOAA scientists are collecting a lot more samples (over 7,000 a year), all of which are measured for stable isotopes, so Spock has a lot of trouble keeping up with the demand. (noaa.gov)
This methodology enables detection of putative metabolites from biological samples and simultaneous quantification of the pattern and extent of isotope labeling. (acs.org)
The storage conditions under which Pb in human WB samples is stable has been fairly well established. (cdc.gov)

Thus, when trace element characteristics and C and Pb stable isotopes ore used in conjunction the sources of elements may be characterised. (bl.uk)
The aerosols were analysed for their Pb isotopic compositions, ð¹³C values and trace element abundance. (bl.uk)
At Milton Keynes, ð¹³C Pb isotopic compositions and trace element abundance were found to vary considerable depending on wind direction, indicating multiple sources. (bl.uk)
Aerosol Pb and trace element abundance were found to be influenced by rainfall, with rain having an apparent scavenging effect on Pb in the atmosphere. (bl.uk)

Isotopes and isotope notation are particularly important in nuclear chemistry. (onlinemathlearning.com)

The laboratory hosts two IRMS instruments, a Thermo Scientific Delta V Advantage and a Delta V Plus, with peripheral equipment and provides light stable isotope determinations on various sample matrices. (luomus.fi)
Collaborative research is prioritized, but time permitting the laboratory provides stable isotope analytical services also for non-collaborative research and non-academic customers. (luomus.fi)
The Stable Isotope Laboratory is part of the larger Environmental Geochemistry Laboratory. (cnr.it)

That Wikipedia article talks about elements, not isotopes, so it doesn't really touch the question. (stackexchange.com)
Magnesium 24 Metal is one of over 250 stable Metallic isotopes produced by American Elements for biological and biomedical labeling, as target materials and other applications. (americanelements.com)
Knowledge of the abundance of the stable isotopes [2] of the light elements in different solar system objects provides critical clues to the origin and early evolution of these objects and of the system as a whole. (eso.org)
Germanium-74 Oxide Isotope is one of over 200 stable isotopes produced by American Elements for biological and biomedical labeling, as target materials and other applications. (americanelements.com)

Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. (springer.com)
were further confirmed by DNA stable-isotope probing analysis of a sample taken from the Moor House peatland (England). (lancs.ac.uk)

The average enrichment of C. floridanus pupae to their diet was 3.0‰ for 15 N and 1.1‰ for 13 C. Stable isotopes have also been used successfully for studying nutrient fluxes utilizing compounds enriched in either 15 N or 13 C as tracers. (uni-bayreuth.de)

According to https://en.wikipedia.org/wiki/Synthetic_element , all stable isotopes created artificially can also be found in nature (I don't have a more reliable source). (stackexchange.com)

The least stable known isotope is 14 F , whose half-life is 500(60) yoctoseconds, corresponding to a resonance width of 910(100) keV. (wikipedia.org)

To date, a limited number of stable isotope studies on fish mucus suggest it has a relatively fast turnover rate. (springer.com)

In our study we examined stable carbon and nitrogen isotopes in polar bear bone collagen. (yahoo.com)

In the Arctic, the base of the food web is sourced from two categories: sea ice-associated algae and open-water phytoplankton, which are distinguishable through their carbon isotopes. (yahoo.com)

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