Isotopes including isotopes. Medical search. Frequent questions

Wiederhold, J. G. Metal stable isotope signatures as tracers in environmental geochemistry. (nature.com)
www.eoas.ubc.ca) in the Faculty of Science at the University of British Columbia (UBC) seeks a global research leader in isotope geochemistry and geochronology for a Tier 1 Canada Research Chair (CRC). (nature.com)
They will be an established researcher and have received wide recognition for their sustained accomplishments in high-temperature geo/thermochronology or isotope geochemistry. (nature.com)
Isotope geochemistry and geochronology are central to EOAS' strength and to UBC's strong industry partnerships: the EOAS-based Mineral Deposit Research Unit (https://mdru.ubc.ca) is one of the world's strongest academic-industry mineral exploration partnerships, working to drive innovation in mineral exploration, a key sector of the BC and Canadian economy. (nature.com)
The environmental isotopes are a subset of isotopes, both stable and radioactive, which are the object of isotope geochemistry. (wikipedia.org)

Responses of carbon isotope ratios of C_3 herbs to humidity index in n" by XIANZHAO LIU, QING SU et al. (tubitak.gov.tr)
The ratio between isotopes of an element varies slightly in the world, so in order to study isotopic ratio changes across the world, changes in isotope ratios are defined as deviations from a standard, multiplied by 1000. (wikipedia.org)
Molybdenum and tungsten are redox-sensitive elements, and their stable isotope ratios have attracted attention as paleoceanographic proxies. (frontiersin.org)
In this study, we provided the concentrations and isotope ratios of dissolved Mo and W in the oceans (the North Pacific and Indian Oceans), marginal seas (the East China Sea and Sea of Japan), and a river-estuary system in Japan (from the Uji-Yodo rivers to Osaka Bay). (frontiersin.org)
Among Mo isotope ratios, the 98 Mo/ 95 Mo ratio is conventionally used as a tracer. (frontiersin.org)
Use of Isotope Ratios in Forensic Analysis (J.L. Brazier). (routledge.com)
Quantifying uranium radio-isotope ratios in riverine suspended particulate matter: Insights into natural and anthropogenic influences in the glacial-fed river system of the NE Tibetan Plateau. (bvsalud.org)

Radioactive isotopes are isotopes that will decay into a different isotope. (wikipedia.org)
By comparison, stable isotopes do not undergo radioactive decay, and their fixed proportions are measured against exponentially decaying proportions of radioactive isotopes to determine the age of a substance. (wikipedia.org)
That's always been a missing piece of the puzzle, since the progressive decay of isotopes results in the synthesis of precious metals in exploding stars. (scienceblog.com)
The word "stable" also describes atoms , and therefore substances, that do not spontaneously undergo nuclear decay, though a stable isotope may (eventually) result directly from the decay of an unstable one. (explainxkcd.com)
The handbook Table of Isotopes has for many years been the most widely used source of information for nuclear structure and decay data. (lu.se)
At present only part of the decay data is implemented, but the service will eventually include search facilities, table generators, charts and drawings of all nuclear structure and decay data in the ToI book. (lu.se)
Past investigations showed that metals, including arsenic , cadmium , manganese , and uranium (and radioactive isotopes and decay products of uranium) had moved from sources on the site into local ground water and surface water. (cdc.gov)

Growth of adlayer graphene on Cu studied by carbon isotope labeling. (nature.com)

That, basically, is what being doubly magic is - an isotope with the protons and neutrons in defined pens. (scienceblog.com)

Abstract is included in .pdf document. (caltech.edu)

The most used environmental isotopes are: deuterium tritium carbon-13 carbon-14 nitrogen-15 oxygen-18 silicon-29 chlorine-36 isotopes of uranium isotopes of strontium One topic that environmental isotopes are used to study is the circulation of the ocean. (wikipedia.org)
These data including carbon and nitrogen isotopes from glacial sediments will be used to constrain process-based models of the modern and LGM ocean. (github.io)
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)
Stable carbon and nitrogen isotope data from green turtles sampled at Dry Tortugas National Park, FL. (usgs.gov)
We compared the macronutrient composition of diets inferred from stable carbon and nitrogen isotopes in polar bear guard hair (primarily representing summer/fall diet) during periods when bears had low and high survival 2004-2016, between bears that summered on land versus pack ice, and between bears occupying different regions of the Alaskan and Canadian Beaufort Sea. (usgs.gov)

Isotope analysis shows exposure to depleted uranium in Gulf War veterans. (derechos.org)
Depleted uranium is a by-product of the enrichment process used to make nuclear fuel, in which one isotope of uranium (235U) is extracted, leaving behind material depleted in that isotope. (derechos.org)
By measuring the relative abundances of different isotopes of uranium in the urine samples, the researchers were able to distinguish between natural and depleted uranium. (derechos.org)
As expected, the soldiers with embedded shrapnel had high concentrations of uranium in their urine, and the isotope analysis showed that it was depleted uranium, presumably being released into their bodies from the shrapnel. (derechos.org)
In addition to possible health effects in soldiers exposed during combat, concerns about depleted uranium include environmental contamination of battlefield sites. (derechos.org)
A fissile isotope , such as uranium-235 , is one that is sufficiently large and unstable to undergo such a chain reaction, as opposed to the more common and less unstable uranium-238 . (explainxkcd.com)
Naturally occurring uranium has three principal radioactive isotopes, namely U-238, U-235 and U-234. (who.int)
Depleted uranium is a by-product of the process of uranium enrichment in the nuclear power industry in which nearly all the radioactive isotope U-234 and about two-thirds of the U-235 are removed. (who.int)
Depleted uranium can also contain traces of other radioactive isotopes introduced during processing. (who.int)
Civil applications of depleted uranium have included counterweights in aeroplanes, and shields against radiation in medical radiotherapy units and transport of radioactive isotopes. (who.int)
The analysis of uranium isotope ratio 235U/238U in environmental media serves as a reliable method to distinguish between natural and anthropogenic sources of uranium , playing a crucial role in assessing the extent of contamination with anthropogenic uranium and disturbances in its biogeochemical cycle . (bvsalud.org)
This may be attributed to the fact that soil retains the cumulative signals of uranium atmospheric deposition, including the deposition of 235U-enriched airborne particulate matter deposited after atmospheric nuclear tests carried out in the second half of the 20th century. (bvsalud.org)

Granular microcrystalline quartz, the most common constituent of chert, has been found to contain hydroxyl groups particularly suitable for hydrogen isotope analyses. (caltech.edu)
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)

These isotopes are used as tracers to study various phenomena of interest. (wikipedia.org)
In most cases, hydrograph separations are conducted using the stable isotopes of water, since they are ideal, conservative tracers. (carleton.edu)

Isotopes are atoms that are of a specific element, but have different numbers of neutrons and thus different mass numbers. (wikipedia.org)
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)
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)
The facility is equipped with one Finnigan Delta+XP and a 3 Delta V continuous flow inlet Stable Isotope Ratio Mass Spectrometers (IRMS). (uwyo.edu)
The facility also houses a GC-C isotope ratio mass spectrometer(Delta V) for exploring compound specific work. (uwyo.edu)
The electromagnetic structure of even-mass 182-188 Hg isotopes was studied using safe-energy Coulomb excitation of neutron-deficient mercury beams delivered by the REX-ISOLDE facility at CERN. (lu.se)
Combining isotope dilution mass spectrometry with a calibration method and choosing appropriate internal standard elements, 14 lanthanides (rare earth elements, REEs) were precisely and accurately determined for rock samples by using quadruple ICP-MS instruments. (elsevierpure.com)
Applying the procedure developed in this study to the homogenized Allende meteorite powder sample prepared by the Smithsonian Institution, Washington, D. C., US and several geological reference samples issued by the Geological Survey of Japan and the US geological Survey, precision and accuracy of the data obtained were evaluated and the accuracy was found to be equivalent to isotope dilution values obtained by thermal ionization mass spectrometry. (elsevierpure.com)

Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. (springer.com)
A laser based Liquid Water Isotope Analyser from Picarro is used for isotopic measurements of H and O of waters. (uwyo.edu)
Discover stable isotope products ranging from gases to complex molecules, including amino acids, carbohydrates, bioactive compounds, and salts - all with isotopic labeling. (sigmaaldrich.com)
The chert-water oxygen isotope fractionation with temperature was estimated from published experimental data and from the isotopic compositions of cherts which formed at approximately known temperatures. (caltech.edu)
Cherts are usually not in isotopic equilibrium with their coexisting carbonates, and the somewhat insensitive chert-calcite oxygen isotope fractionation thus cannot be used to obtain meaningful temperatures. (caltech.edu)

The decomposition will be extended to dissolved oxygen and carbon isotopes (δ 13 C). Hypotheses regarding modern and glacial ocean carbon storage will be tested. (github.io)

For example, 3H (tritium) is a radioactive isotope of hydrogen. (wikipedia.org)

Mucus isotope data differed significantly and predictively from muscle data. (springer.com)
This sampling array creates a data-rich environment for subsequent studies, including information on vegetation, litterfall, and soil properties, as well as soil and atmosphere moisture and temperature. (carleton.edu)
Isotope data: An ISCO auto-sampler was deployed in the study area on 21 March 2014 and programmed to collect 1 L samples at 1 or 2 hour intervals after triggering by an increase in water level (i.e., signaling a storm event producing a rising hydrograph). (carleton.edu)
Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). (americanelements.com)
Further data for radioisotopes (radioactive isotopes) of curium are listed (including any which occur naturally) below. (webelements.com)
Further data for naturally occuring isotopes of curium are listed above. (webelements.com)
Yet there is a paucity of data on the adaptability of food webs to ecosystem change, including predator-prey interactions. (usgs.gov)
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The isotope data indicate that, for many darts, the diagenetic, transformation of opal to granular microcrystalline quartz occurred in the presence of meteoric waters. (caltech.edu)
Guatemalan lavas exhibit systematic along-arc variations in U-series isotope data. (confex.com)
This service is intended to give convenient Web access to the Table of Isotopes data. (lu.se)
Data are contextualized by comparisons with previously published Tiwanaku isotope data from the period. (who.int)
Stable isotope techniques (non-radioactive) generate accurate data that provide evidence for improving nutrition interventions and programmes. (who.int)

PCIGR is one of the most advanced analytical facilities in the world for geochemical research, with state-of-the-art instrumentation for ultra-sensitive and precise analysis of trace elements and isotopes in a wide range of Earth system materials (from mantle plumes and ocean sediments to bivalves and honey). (nature.com)

Using scanning transmission electron microscopy-electron energy loss spectroscopy, we obtain an isotope map that confirms the segregation of 12 C atoms that diffused rapidly. (nature.com)
Because the NSCL is the nation's premier rare isotope accelerator, it's capable of shooting 100 billion krypton atoms a second. (scienceblog.com)

δ C 13 = ( ( C 13 C 12 ) s a m p l e ( C 13 C 12 ) s t a n d a r d − 1 ) × 1000 {\displaystyle \delta {\ce {^{13}C}}=\left({\frac {\left({\frac {{\ce {^{13}C}}}{{\ce {^{12}C}}}}\right)_{sample}}{\left({\frac {{\ce {^{13}C}}}{{\ce {^{12}C}}}}\right)_{standard}}}-1\right)\times 1000} ‰ These variations in isotopes can occur through many types of fractionation. (wikipedia.org)

The spatial resolutions of even the most sensitive isotope analysis techniques based on light or ion probes are limited to a few hundred nanometres. (nature.com)
Isotope analysis in the transmission electron microscope. (nature.com)
Within the present study, DNA barcoding and stable isotope analysis improve prey identification and provide a more quantitative dietary analysis of adult black bass in Lake Ontario, comparing the importance of Round Goby as prey between these two species. (datadryad.org)
METHODS: We use stable isotope analysis of 43 human bone samples representing 14 females, 20 males, 8 juveniles, and 1 indeterminate individual recovered from burial excavations at the sites of Rio Muerto and Omo in the Moquegua Valley. (who.int)
3-5 breast feathers were removed for isotope analysis. (cdc.gov)

Stable isotope labeling by amino acids in cell culture, SILAC, as a simple and accurate approach to expression proteomics. (nature.com)

Because nickel must get rid of so many extra neutrons, this isotope is extremely unstable and does not exist in nature. (scienceblog.com)
A radionuclide ( radioactive nuclide , radioisotope or radioactive isotope ) is a nuclide that has excess nuclear energy, making it unstable. (wikipedia.org)
Ponytail fear that her raspberries have too many unstable isotopes so that her fields risk undergoing a similar fission-driven chain reaction. (explainxkcd.com)

Radioactive isotopes are generally more useful on shorter timescales, such as investigating modern circulation of the ocean using 14C, while stable isotopes are generally more useful on longer timescales, such as investigating differences in river flow with stable strontium isotopes. (wikipedia.org)
Natural strontium is not radioactive and exists in four stable types (or isotopes), each of which can be written as 84 Sr, 86 Sr, 87 Sr, and 88 Sr, and read as strontium eighty-four, strontium eighty-six, etc. (cdc.gov)
Strontium can also exist as radioactive isotopes. (cdc.gov)
90 Sr, or strontium ninety, is the most hazardous of the radioactive isotopes of the chemical element strontium. (cdc.gov)
Each radioactive element, including strontium, constantly gives off radiation, and this process changes it into an isotope of another element or a different isotope of the same element. (cdc.gov)

All four isotopes behave the same chemically, so any combination of the four would have the same chemical effect on your body. (cdc.gov)

This is due to the kinetic isotope effect (KIE) and is caused by different isotope molecules reacting at different speeds. (wikipedia.org)
Water molecules with heavier isotopes (18O and 2H) tend to stay in the liquid phase as water molecules with lighter isotopes (16O and 1H) preferentially move to the gas phase. (wikipedia.org)

Previous studies have suggested several explanations for the lower atmospheric CO 2 concentrations during the LGM including, increased sea ice cover, more sluggish deep ocean circulation, cooler temperatures and increased dust-borne iron fluxes that fertilized phytoplankton growth. (github.io)

This table shows information about naturally occuring isotopes , their atomic masses , their natural abundances , their nuclear spins , and their magnetic moments . (webelements.com)

This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. (webelements.com)
Unplanned exposure to radionuclides generally has a harmful effect on living organisms including humans, although low levels of exposure occur naturally without harm. (wikipedia.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)

Isotope abundances of curium. (webelements.com)

The versatility and sensitivity of the proposed in vitro epithelial translocation (INVET) system was demonstrated using a variety of industry relevant ENMs including CeO2 of various primary particle diameter, ZnO, and SiO2-coated CeO2 and ZnO particles. (cdc.gov)

The kit includes matched, deuterium-labeled internal standards for a total of 44 solutions. (cdc.gov)

For example, our study guide provides secrets and strategies for taking the test, including methods to beat the toughest questions. (testprepreview.com)
Ebihara, M, Hayano, K & Shirai, N 2020, ' Determination of trace rare earth elements in rock samples including meteorites by ICP-MS coupled with isotope dilution and comparison methods ', Analytica Chimica Acta , vol. 1101, pp. 81-89. (elsevierpure.com)

Radiotherapy (including brachytherapy) is the main treatment for advanced cervical cancer. (who.int)
With the generous support of donor countries such as France, Japan, Monaco, Sweden, and the United States, the private sector and international financial institutions, Rays of Hope supports countries in the establishment and expansion of radiotherapy services, including brachytherapy, with a particular focus on more than 20 IAEA Member States that completely lack facilities for radiation treatment, most of which are in Africa. (who.int)

Fig. 2: In situ growth of isotope nanodomains. (nature.com)

Techniques developed in this study include: reverse-oriented dual priming oligonucleotides used as blocking primers for predator DNA, and an automated design approach of restriction fragment length polymorphism tests for identifying prey DNA barcodes. (datadryad.org)

Among those physical agents considered suitable for evaluation by the Monographs, and assigned high priority at that time, were electric and magnetic fields, the radioactive isotope iodine-131, and radioactive wastes. (who.int)

ENMs were neutron activated, forming gamma emitting isotopes 141Ce and 65Zn, respectively. (cdc.gov)

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