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Isotope stable isotopes

Heterogeneities in stable isotopes are difficult to detect, because stable isotope ratios are affected by the various partial melting-crystal fractionation processes that are governed by temperature-dependent fractionation factors between residual crystals and partial melt and between cumulate crystals and residual liquid. Unlike radiogenic isotopes, stable isotopes are also fractionated by low temperature surface processes. Therefore, they offer a potentially important means by which recycled crustal material can be distinguished from intra-mantle fractionation processes. [Pg.103]

Stable isotope Stable isotopes of an element differ in mass due to the number of neutrons but have the same elemental and chemical characterisitics as the element. Stable isotopes are not radioactive. Common stable elements and their stable isotopes are H and 2H 12C and BC 14N and 1SN O and lsO 32S and 34S. [Pg.56]

Isotopes that are not radioactive are called stable isotopes. If a particular isotope contains a greater number of neutrons than the most common form of the element, the isotope is frequently referred to as a heavy isotope. Stable isotopes commonly used In biochemical research include H (deuterium), C , N , O", S Ca, Fe Fe , Zn . and Zn . [Pg.393]

Isotopes are atoms with (slightly) different masses of the same chemical element. They contain the same number of protons but differ in the number of neutrons in the nucleus. Isotopically labeled compound can be obtained from two different type of isotopes stable isotopes (e.g., H, C, 0) and radioactive isotopes (e.g.,... [Pg.52]

Figrue BTl 1.1 shows the range of radiolfequencies where resonances may be expected, between 650 and 140 MHz, when Bq = 14.1 T, i.e. when the H resonance frequency is 600 MHz. There is one bar per stable isotope. Its width is the reported chemical shift range (Bl.11.5) for that isotope, and its height corresponds to the log of the sensitivity at the natural abundance of the isotope, covering about six orders of magnitude. The... [Pg.1438]

Naturally occurring zinc contains five stable isotopes. Sixteen other unstable isotopes are recognized. [Pg.53]

The sulfate and the oxides are important compounds. Natural nickel is a mixture of five stable isotopes nine other unstable isotopes are known. [Pg.68]

Naturally selenium contains six stable isotopes. Fifteen other isotopes have been characterized. The element is a member of the sulfur family and resembles sulfur both in its various forms and in its compounds. [Pg.97]

Naturally occurring krypton contains six stable isotopes. Seventeen other unstable isotopes are now recognized. The spectral lines of krypton are easily produced and some are very sharp. While krypton is generally thought of as a rare gas that normally does not combine with other elements to form compounds, it now appears that the existence of some krypton compounds is established. Krypton difluoride has been prepared in gram quantities and can be made by several methods. A higher fluoride of krypton and a salt of an oxyacid of krypton also have been... [Pg.100]

Strontium is softer than calcium and decomposes in water more vigorously. It does not absorb nitrogen below 380oC. It should be kept under kerosene to prevent oxidation. Freshly cut strontium has a silvery appearance, but rapidly turns a yellowish color with the formation of the oxide. The finely divided metal ignites spontaneously in air. Volatile strontium salts impart a beautiful crimson color to flames, and these salts are used in pyrotechnics and in the production of flares. Natural strontium is a mixture of four stable isotopes. [Pg.102]

Ordinary tin is composed of nine stable isotopes 18 unstable isotopes are also known. Ordinary tin is a silver-white metal, is malleable, somewhat ductile, and has a highly crystalline structure. Due to the breaking of these crystals, a "tin cry" is heard when a bar is bent. [Pg.118]

Thirty isotopes are recognized. Only one stable isotope, 1271 is found in nature. The artificial radioisotope 1311, with a half-life of 8 days, has been used in treating the thyroid gland. The most common compounds are the iodides of sodium and potassium (KI) and the iodates (KIOs). Lack of iodine is the cause of goiter. [Pg.122]

Natural lanthanum is a mixture of two stable isotopes, 138La and 139La. Twenty three other radioactive isotopes are recognized. [Pg.129]

Each element that has neither a stable isotope nor a characteristic natural isotopic composition is represented in this table by one of that element s commonly known radioisotopes identified by mass number and relative atomic mass. [Pg.224]

Atoms with the same number of protons but a different number of neutrons are called isotopes. To identify an isotope we use the symbol E, where E is the element s atomic symbol, Z is the element s atomic number (which is the number of protons), and A is the element s atomic mass number (which is the sum of the number of protons and neutrons). Although isotopes of a given element have the same chemical properties, their nuclear properties are different. The most important difference between isotopes is their stability. The nuclear configuration of a stable isotope remains constant with time. Unstable isotopes, however, spontaneously disintegrate, emitting radioactive particles as they transform into a more stable form. [Pg.642]

Neutron Activation Analysis Few samples of interest are naturally radioactive. For many elements, however, radioactivity may be induced by irradiating the sample with neutrons in a process called neutron activation analysis (NAA). The radioactive element formed by neutron activation decays to a stable isotope by emitting gamma rays and, if necessary, other nuclear particles. The rate of gamma-ray emission is proportional to the analyte s initial concentration in the sample. For example, when a sample containing nonradioactive 13AI is placed in a nuclear reactor and irradiated with neutrons, the following nuclear reaction results. [Pg.645]

Baillie, T.A., Stable Isotopes Application in Pharmacology, Toxicology and Clinical Research, Macmillan, London, 1978. [Pg.449]

For marble provenance studies, the most successful technique seems to be the measurement, through mass spectrometry, of the abundance ratios of the stable isotopes of carbon and oxygen (116). However, no single technique appears to provide unequivocal results, especially in cases such as the different Mediterranean sources, and a combination is often necessary to arrive at an approximate place of origin (117). [Pg.423]

Helium-3 [14762-55-1], He, has been known as a stable isotope since the middle 1930s and it was suspected that its properties were markedly different from the common isotope, helium-4. The development of nuclear fusion devices in the 1950s yielded workable quantities of pure helium-3 as a decay product from the large tritium inventory implicit in maintaining an arsenal of fusion weapons (see Deuterium AND TRITIUM) Helium-3 is one of the very few stable materials where the only practical source is nuclear transmutation. The chronology of the isolation of the other stable isotopes of the hehum-group gases has been summarized (4). [Pg.4]

Iodine [7553-56-2] I, atomic number 53, atomic weight 126.9044, is a nonmetaUic element belonging to the halogen family in Group 17 (VIIA) of the Periodic Table. The only stable isotope has a mass number of 127. There are 22 other iodine isotopes having masses between 117 and 139 14 of these isotopes yield significant radiation. [Pg.358]

Lead, atomic number 82, is a member of Group 14 (IVA) of the Periodic Table. Ordinary lead is bluish grey and is a mixture of isotopes of mass number 204 (15%), 206 (23.6%), 207 (22.6%), and 208 (52.3%). The average atomic weight of lead from different origins may vary as much as 0.04 units. The stable isotopes are products of decay of three naturally radioactive elements (see Radioactivity, natural) comes from the uranium series (see Uraniumand... [Pg.32]

In nature, oxygen occurs in three stable isotopic species oxygen-16 [14797-70-7] O, 99.76% oxygen-17 [13968-48-4], 0.038% and oxygen-18 [14797-71-8], 0.20% (7). Commercial fractional distillation of water produces concentrations of as high as 99.98% concentrations up to 55% are also produced. The isotope has been used to trace mechanisms of organic reactions. [Pg.475]

The relative abundance of the stable isotopes of the PGMs and their CAS Registry Numbers are shown in Table 1. [Pg.162]

Table 1. CAS Numbers and Relative Abundanees of Stable Isotopes of PGMs... Table 1. CAS Numbers and Relative Abundanees of Stable Isotopes of PGMs...

See other pages where Isotope stable isotopes is mentioned: [Pg.432]    [Pg.560]    [Pg.330]    [Pg.432]    [Pg.330]    [Pg.14]    [Pg.27]    [Pg.181]    [Pg.228]    [Pg.331]    [Pg.1371]    [Pg.22]    [Pg.51]    [Pg.85]    [Pg.106]    [Pg.124]    [Pg.126]    [Pg.175]    [Pg.197]    [Pg.505]    [Pg.158]    [Pg.377]    [Pg.439]    [Pg.6]    [Pg.223]    [Pg.104]    [Pg.105]    [Pg.20]    [Pg.73]    [Pg.163]   
See also in sourсe #XX -- [ Pg.269 ]




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Application of Stable Isotope Enrichment

Application of Stable Isotopes

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Available Stable Isotopes of the Elements

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Carbon stable isotopes

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Fractionation Isotopes, stable

Fractionation of stable isotopes

Gases stable isotope ratio measurements

Hydrogen stable isotope ratio analysis

Hydrogen, stable isotopes

I Stable and radioactive isotopes

ICP-MS in stable isotope-based metabolic

ICP-MS in stable isotope-based metabolic studies

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Isotopic labelling with stable isotopes

Labeling, stable isotope clusters

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Lead stable isotope ratios

Light stable isotope

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Mass spectrometry and stable isotopes

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Nitrogen stable isotopes

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Oxygen stable isotopes

Peptide derivatization stable isotope labeling

Peptide sequencing stable isotope labeling

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Physical and chemical controls on stable isotope fractionation

Plant enrichment with stable isotopes

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Proteolytic stable isotope labeling

Quantification of Stable Isotopic Tracers

Quantification stable isotope dilution analysis

Quantification stable isotope standards

Quantitation of Folates by Stable Isotope Dilution Assays

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SIRA, stable isotope ratio analysis

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Separation of stable isotopes

Spectroscopy stable-isotope dilution analysis

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Stable Isotope Dilution Assays

Stable Isotope Dilution Mass Spectrometry

Stable Isotope Labeling at the Peptide Level

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Stable Isotope Probes

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Stable Isotopes Classification According to Natural Abundance

Stable Isotopes in Biosynthetic Studies

Stable Isotopes of Oxygen

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Stable carbon isotope ratios animals

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Stable carbon isotope ratios diets

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Stable isotope

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Stable isotope accelerator mass spectrometry

Stable isotope analysis

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Stable isotope labeling

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Stable isotope labeling by amino acids

Stable isotope labeling by amino acids in cell

Stable isotope labeling by amino acids in cell culture

Stable isotope labeling by amino acids in cell culture, SILAC

Stable isotope labeling in cell culture

Stable isotope labeling with amino acids

Stable isotope labeling with amino acids cell culture

Stable isotope labeling with amino acids in cell

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Stable isotope labelled compounds as internal standards

Stable isotope labelling

Stable isotope measurement

Stable isotope measurement 8-value

Stable isotope measurement mass spectrometry

Stable isotope natural abundance measurements

Stable isotope natural abundance measurements application

Stable isotope oxidative stress

Stable isotope peptide derivatization

Stable isotope probing

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Stable isotope ratio analysis

Stable isotope ratio determination

Stable isotope ratio mass spectrometers

Stable isotope ratio test

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Stable isotope ratios carbon

Stable isotope standards and capture

Stable isotope standards and capture by anti-peptide antibodies

Stable isotope standards with capture

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