Calcium isotopes. Medical search

Isotopes: Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)Calcium Isotopes: Stable calcium atoms that have the same atomic number as the element calcium, but differ in atomic weight. Ca-42-44, 46, and 48 are stable calcium isotopes.Chemical Engineering Magic: Beliefs and practices concerned with producing desired results through supernatural forces or agents as with the manipulation of fetishes or rituals.Neutrons: Electrically neutral elementary particles found in all atomic nuclei except light hydrogen; the mass is equal to that of the proton and electron combined and they are unstable when isolated from the nucleus, undergoing beta decay. Slow, thermal, epithermal, and fast neutrons refer to the energy levels with which the neutrons are ejected from heavier nuclei during their decay.Protons: Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.Neutron Diffraction: The scattering of NEUTRONS by matter, especially crystals, with accompanying variation in intensity due to interference effects. It is useful in CRYSTALLOGRAPHY and POWDER DIFFRACTION.Magnoliaceae: A plant family of the order Magnoliales, subclass Magnoliidae, class Magnoliopsida. They are trees and shrubs having an elongated conelike floral axis with fragrant flowers that have six tepals (sepals and petals that are not distinctly different) and many spirally arranged stamens.Invertebrates: Animals that have no spinal column.Perches: A common name for fish of the family Percidae, belonging to the suborder Percoidei, order PERCIFORMES.Elements: Substances that comprise all matter. Each element is made up of atoms that are identical in number of electrons and protons and in nuclear charge, but may differ in mass or number of neutrons.Animal Shells: The hard rigid covering of animals including MOLLUSCS; TURTLES; INSECTS; and crustaceans.Electron Probe Microanalysis: Identification and measurement of ELEMENTS and their location based on the fact that X-RAYS emitted by an element excited by an electron beam have a wavelength characteristic of that element and an intensity related to its concentration. It is performed with an electron microscope fitted with an x-ray spectrometer, in scanning or transmission mode.Intestinal Absorption: Uptake of substances through the lining of the INTESTINES.Omeprazole: A 4-methoxy-3,5-dimethylpyridyl, 5-methoxybenzimidazole derivative of timoprazole that is used in the therapy of STOMACH ULCERS and ZOLLINGER-ELLISON SYNDROME. The drug inhibits an H(+)-K(+)-EXCHANGING ATPASE which is found in GASTRIC PARIETAL CELLS.Calcium, Dietary: Calcium compounds used as food supplements or in food to supply the body with calcium. Dietary calcium is needed during growth for bone development and for maintenance of skeletal integrity later in life to prevent osteoporosis.Proton Pump Inhibitors: Compounds that inhibit H(+)-K(+)-EXCHANGING ATPASE. They are used as ANTI-ULCER AGENTS and sometimes in place of HISTAMINE H2 ANTAGONISTS for GASTROESOPHAGEAL REFLUX.Calcium Gluconate: The calcium salt of gluconic acid. The compound has a variety of uses, including its use as a calcium replenisher in hypocalcemic states.Calcitriol: The physiologically active form of vitamin D. It is formed primarily in the kidney by enzymatic hydroxylation of 25-hydroxycholecalciferol (CALCIFEDIOL). Its production is stimulated by low blood calcium levels and parathyroid hormone. Calcitriol increases intestinal absorption of calcium and phosphorus, and in concert with parathyroid hormone increases bone resorption.Polynesia: The collective name for the islands of the central Pacific Ocean, including the Austral Islands, Cook Islands, Easter Island, HAWAII; NEW ZEALAND; Phoenix Islands, PITCAIRN ISLAND; SAMOA; TONGA; Tuamotu Archipelago, Wake Island, and Wallis and Futuna Islands. Polynesians are of the Caucasoid race, but many are of mixed origin. Polynesia is from the Greek poly, many + nesos, island, with reference to the many islands in the group. (From Webster's New Geographical Dictionary, 1988, p966 & Room, Brewer's Dictionary of Names, 1992, p426)Fossils: Remains, impressions, or traces of animals or plants of past geological times which have been preserved in the earth's crust.Information Storage and Retrieval: Organized activities related to the storage, location, search, and retrieval of information.Algorithms: A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.Internet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Software: Sequential operating programs and data which instruct the functioning of a digital computer.User-Computer Interface: The portion of an interactive computer program that issues messages to and receives commands from a user.Wind: The motion of air relative to the earth's surface.Solar System: The group of celestial bodies, including the EARTH, orbiting around and gravitationally bound by the sun. It includes eight planets, one minor planet, and 34 natural satellites, more than 1,000 observed comets, and thousands of lesser bodies known as MINOR PLANETS (asteroids) and METEOROIDS. (From Academic American Encyclopedia, 1983)Extraterrestrial Environment: The environment outside the earth or its atmosphere. The environment may refer to a closed cabin (such as a space shuttle or space station) or to space itself, the moon, or other planets.Planets: Celestial bodies orbiting around the sun or other stars.Neon: Neon. A noble gas with the atomic symbol Ne, atomic number 10, and atomic weight 20.18. It is found in the earth's crust and atmosphere as an inert, odorless gas and is used in vacuum tubes and incandescent lamps.Spacecraft: Devices, manned and unmanned, which are designed to be placed into an orbit about the Earth or into a trajectory to another celestial body. (NASA Thesaurus, 1988)Moon: The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.Cadmium: An element with atomic symbol Cd, atomic number 48, and atomic weight 114. It is a metal and ingestion will lead to CADMIUM POISONING.Ethane Tooth Preparation: Procedures carried out with regard to the teeth or tooth structures preparatory to specified dental therapeutic and surgical measures.Lasers: An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.Radius: The outer shorter of the two bones of the FOREARM, lying parallel to the ULNA and partially revolving around it.Cadmium Poisoning: Poisoning occurring after exposure to cadmium compounds or fumes. It may cause gastrointestinal syndromes, anemia, or pneumonitis.Earth Sciences: Fields of science encompassing studies and research from the disciplines of PHYSICS; CHEMISTRY; BIOLOGICAL SCIENCES; and MATHEMATICS; that are related to the planet EARTH. Subfields include atmospheric chemistry; CLIMATOLOGY; ENVIRONMENTAL SCIENCES; GEOGRAPHY; GEOLOGY; geophysics; METEOROLOGY; OCEANOGRAPHY; PALEONTOLOGY; mineralogy; and seismology.Arizona Bone and Bones: A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principle cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.Space Flight: Travel beyond the earth's atmosphere.Bone Density: The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.Bone Remodeling: The continuous turnover of BONE MATRIX and mineral that involves first an increase in BONE RESORPTION (osteoclastic activity) and later, reactive BONE FORMATION (osteoblastic activity). The process of bone remodeling takes place in the adult skeleton at discrete foci. The process ensures the mechanical integrity of the skeleton throughout life and plays an important role in calcium HOMEOSTASIS. An imbalance in the regulation of bone remodeling's two contrasting events, bone resorption and bone formation, results in many of the metabolic bone diseases, such as OSTEOPOROSIS.Meteoroids: Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Columbidae: Family in the order COLUMBIFORMES, comprised of pigeons or doves. They are BIRDS with short legs, stout bodies, small heads, and slender bills. Some sources call the smaller species doves and the larger pigeons, but the names are interchangeable.Evolution, Planetary: Creation and development of bodies within solar systems, includes study of early planetary geology.Earth (Planet): Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.Exobiology: The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.

Effects of high compared with low calcium intake on calcium absorption and incorporation of iron by red blood cells in small children. (1/181)

BACKGROUND: The potential benefits of increasing calcium intake in small children must be balanced with the potential risk to iron utilization from high calcium intakes. OBJECTIVE: This study was designed to evaluate the relation between calcium intake and calcium absorption and iron incorporation into red blood cells. DESIGN: We performed a multitracer, crossover study of the absorption of calcium and red blood cell incorporation of iron in 11 preschool children aged 3-5 y who had been adapted for 5 wk to low- (502 +/- 99 mg) and high- (1180 +/- 117 mg) calcium diets. Stable-isotope studies were performed by using 44Ca and 58Fe given orally with meals and 46Ca given intravenously. RESULTS: Iron incorporation into red blood cells 14 d postdosing was similar (6.9 +/- 4.2% compared with 7.9 +/- 5.5%; NS) with the low- and high-calcium diets, respectively. Total calcium absorption (181 +/- 50 compared with 277 +/- 91 mg/d; P = 0.002) was greater in children with the higher calcium intake. CONCLUSIONS: Our findings indicate that small children may benefit from calcium intakes similar to those recommended for older children without adverse effects on dietary iron utilization. (+info)

Characterization of prostanoid receptors in podocytes. (2/181)

Prostaglandins participate in the regulation of important glomerular functions and are involved in the pathogenesis of glomerular diseases. This study investigates the influence of prostaglandins on membrane voltage, ion conductances, cAMP accumulation, and cytosolic calcium activity ([Ca2+]i) in differentiated podocytes. Prostaglandin E2 (PGE2) caused a concentration-dependent depolarization and an increase of the whole cell conductance in podocytes (EC50 approximately 50 nM). Compared with PGE2, the EP2/EP3/EP4 receptor agonist 11-deoxy-PGE1 caused an equipotent depolarization, whereas the DP receptor agonist BW 245 C, the EP1/EP3 receptor agonist sulprostone, and the IP receptor agonist iloprost were at least 100 to 1000 times less potent than PGE2. The EP2 receptor agonist butaprost did not change membrane voltage of podocytes. The depolarizing effect of PGE2 was increased in an extracellular solution with a reduced Cl- concentration (from 145 to 32 mM). PGE2 and the prostaglandin agonists, but not the IP receptor agonist iloprost and the EP2 receptor agonist butaprost, induced a time- and concentration-dependent cAMP accumulation in podocytes. In fura-2 fluorescence experiments, PGE2, sulprostone, PGF2alpha, fluprostenol (a potent FP agonist), and U-46619 (a selective thromboxane A2 agonist) induced a biphasic increase of [Ca2+]i in 60 to 80% of podocytes. In reverse transcription-PCR studies, podocyte mRNA for the EP1, EP4, FP, and TP receptor could be amplified. These data indicate that in podocytes, PGE2 regulates distinct cellular functions via the EP1 and EP4 receptor, thereby increasing [Ca2+]i and cAMP, respectively. Furthermore, PGF1alpha and U-46619 increase [Ca2+]i via their specific receptors. (+info)

Calcium isotope fractionation between soft and mineralized tissues as a monitor of calcium use in vertebrates. (3/181)

Calcium from bone and shell is isotopically lighter than calcium of soft tissue from the same organism and isotopically lighter than source (dietary) calcium. When measured as the (44)Ca/(40)Ca isotopic ratio, the total range of variation observed is 5.5 per thousand, and as much as 4 per thousand variation is found in a single organism. The observed intraorganismal calcium isotopic variations and the isotopic differences between tissues and diet indicate that isotopic fractionation occurs mainly as a result of mineralization. Soft tissue calcium becomes heavier or lighter than source calcium during periods when there is net gain or loss of mineral mass, respectively. These results suggest that variations of natural calcium isotope ratios in tissues may be useful for assessing the calcium and mineral balance of organisms without introducing isotopic tracers. (+info)

Isotopic evidence for variations in the marine calcium cycle over the Cenozoic. (4/181)

Significant variations in the isotopic composition of marine calcium have occurred over the last 80 million years. These variations reflect deviations in the balance between inputs of calcium to the ocean from weathering and outputs due to carbonate sedimentation, processes that are important in controlling the concentration of carbon dioxide in the atmosphere and, hence, global climate. The calcium isotopic ratio of paleo-seawater is an indicator of past changes in atmospheric carbon dioxide when coupled with determinations of paleo-pH. (+info)

High bioavailability of calcium in fortified Horlicks. (5/181)

OBJECTIVE: To compare the bioavailability of calcium carbonate-fortified Horlicks with calcium naturally present in milk. DESIGN: Randomised crossover within-subject comparison using a double label stable isotope technique. SETTING: Institute of Food Research, Human Nutrition Unit. PARTICIPANTS: Sixteen pre-menopausal women aged 23-40 y, habituated to a high-calcium diet (mean 1240 mg/day). RESULTS: Mean true fractional calcium absorption was 38.8% (s.d.+/-14.5) from Horlicks and 21.2% (s.d.+/-4.6) from milk. Significantly more calcium was absorbed from a serving of Horlicks than from the same quantity of calcium present in 420 g semi-skimmed milk (P<0.001). CONCLUSIONS: Fortified Horlicks is a highly bioavailable source of calcium. A single serving, containing at least 500 mg calcium, provides half the reference nutrient intake for the population sub-group with the highest requirement (adolescent boys) and more than half for all others. SPONSORSHIP: SmithKline Beecham funded this research project. (+info)

Calcium absorption measured by stable calcium isotopes ((42)Ca & (44)Ca) among Northern Chinese adolescents with low vitamin D status. (6/181)

An adequate calcium intake and vitamin-D status is important for bone mineralization in adolescents. In Northern China, calcium intake and plasma vitamin-D level of adolescents is low due to low consumption of dairy foods and inadequate sunshine exposure. True fractional calcium absorption (TFCA) in Chinese adolescents has never been performed. This study aims to evaluate nutritional adaptation namely, TFCA and urinary calcium excretion among Chinese adolescents in northern China. (+info)

Overview of the 7th European symposium on calcium-binding proteins in normal and transformed cells. (7/181)

The strong feature of the meeting was the continuing efforts described in many papers to resolve the multiple ways in which calcium ions are released into cells via messenger signals and then interact with receptors to cause differential internal cellular activation and cell/cell communication. An easy general way to relate these studies to cell components is to start analysis from the genetic structures lying behind all cell activities and then to explore the RNA production, the proteome, the small substrates and calcium levels themselves in turn while referring to the environment of a particular cell, organ or organism. There is then of course the overall physiology. I shall summarize the papers in this order of their main interests. (+info)

A novel dual radio- and stable-isotope method for measuring calcium absorption in humans: comparison with the whole-body radioisotope retention method. (8/181)

BACKGROUND: Dietary calcium absorption can be determined only with the use of isotope techniques. Currently used isotope techniques require exclusive equipment or are not true tracer approaches. OBJECTIVE: The objective was to compare a dual-isotope method combining radioisotopes and stable isotopes with a whole-body radioisotope retention method for measuring calcium absorption. DESIGN: Seven healthy adults aged 21-27 y consumed a test meal containing 63 +/- 14 (macro x +/- SD) mg Ca together with a water solution of (47)Ca (0.11 MBq). One hour after ingestion, 18 mg (44)Ca was administered intravenously. All feces and urine were collected for 5 and 6 d, respectively. Calcium absorption was estimated from whole-body retention of the radioisotope 12 times over 3 wk after ingestion and from the excretion of (47)Ca and (44)Ca in a 24-h urine sample collected on day 2. (44)Ca in urine was determined by inductively coupled plasma mass spectrometry. RESULTS: Mean (+/- SD) calcium absorption was 75 +/- 9% with the dual-isotope method and was 74 +/- 8% with the whole-body radioisotope retention method. There was a high degree of agreement between the methods. CONCLUSION: The dual-isotope method is a valid approach for measuring calcium absorption from a single meal. (+info)

Isotopes of calcium

Calcium (20Ca) has 24 isotopes, from 34Ca to 57Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and 46Ca), plus one ... Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 102,000 years. Unlike cosmogenic isotopes ... All other calcium isotopes have half-lives of 163 days or less, most under a minute. The least stable is 34Ca with a half-life ... Calcium isotopes data from The Berkeley Laboratory Isotopes Project's. ...

Permian-Triassic extinction event

"Calcium isotope constraints on the end-Permian mass extinction". Proceedings of the National Academy of Sciences of the United ... A large (approximately 0.9%), abrupt global decrease in the ratio of the stable isotope 13 C to that of 12 C, coincides with ... Scientists have found worldwide evidence of a swift decrease of about 1% in the 13C/12C isotope ratio in carbonate rocks from ... However, the pattern of isotope shifts expected to result from a massive release of methane does not match the patterns seen ...

Klaus Blaum

Masses of exotic calcium isotopes pin down nuclear forces, in: Nature 498, 346-349 (2013). E. Minaya Ramirez et al.: Direct ... Discovery of Rn-229 and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements, in: Physical ...

Snowball Earth

"Boron and calcium isotope composition in Neoproterozoic carbonate rocks from Namibia: evidence for extreme environmental change ... The released calcium cations react with the dissolved bicarbonate in the ocean to form calcium carbonate as a chemically ... Isotopes of the element boron suggest that the pH of the oceans dropped dramatically before and after the Marinoan glaciation. ... There are two stable isotopes of carbon in sea water: carbon-12 (12C) and the rare carbon-13 (13C), which makes up about 1.109 ...

Scandium

The primary decay products at atomic weights below 45Sc are calcium isotopes and the primary products from higher atomic ... In nature, scandium is found exclusively as the isotope 45Sc, which has a nuclear spin of 7/2; this is its only stable isotope ... This element also has five meta states, with the most stable being 44mSc (t1/2 = 58.6 h). The isotopes of scandium range from ... The primary decay mode at masses lower than the only stable isotope, 45Sc, is electron capture, and the primary mode at masses ...

Isotopes of scandium

The primary decay products at atomic weights below 45Sc are calcium isotopes and the primary products from higher atomic ... Bold for stable isotopes, bold italic for nearly-stable isotopes (half-life longer than the age of the universe) Values marked ... Registration required (help)). Isotope masses from: G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The ... This element also has 13 meta states with the most stable being 44m2Sc (t1/2 58.6 h). The isotopes of scandium range in atomic ...

Alkaline earth metal

... and all isotopes of radium are radioactive. Calcium-48 is the lightest nuclide to undergo double beta decay. Calcium and barium ... Calcium as a material has been known since at least the first century, as the ancient Romans were known to have used calcium ... Calcium sulfate has been known to be able to set broken bones since the tenth century. Calcium itself, however, was not ... Magnesium and calcium are very common in the earth's crust, with calcium the fifth-most-abundant element, and magnesium the ...

2017 in paleontology

... food web in marine vertebrate assemblages prior to the Cretaceous-Paleogene extinction event as indicated by calcium isotope ... Jamie R. Wood; R. Paul Scofield; Jill Hamel; Chris Lalas; Janet M. Wilmshurst (2017). "Bone stable isotopes indicate a high ... "Oxygen isotope fractionation between bird bone phosphate and drinking water". The Science of Nature. 104 (5-6): Article 47. ... "Calcium Isotopic Evidence for Vulnerable Marine Ecosystem Structure Prior to the K/Pg Extinction". Current Biology. 27 (11): ...

Calcium-48

... is a scarce isotope of calcium containing 20 protons and 28 neutrons. It makes up 0.187% of natural calcium by mole ... 2002). "New neutron-rich isotopes, 34Ne, 37Na and 43Si, produced by fragmentation of a 64A MeV 48Ca beam". Physics Letters B. ... October 2006). "Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm+48Ca fusion reactions". Physical ...

Calcium

... isotope fractionation during mineral formation has led to several applications of calcium isotopes. In particular, the ... Calcium is the first (lightest) element to have six naturally occurring isotopes. By far the most common isotope of calcium in ... Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and 46Ca) and one isotope with a half-life so ... Mass-dependent differences in calcium isotope composition are conventionally expressed by the ratio of two isotopes (usually ...

Ununennium

... of the quasi-stable neutron-rich isotope calcium-48 which could be used as a projectile to produce more neutron-rich isotopes ... Some heavier isotopes may be more stable; Fricke and Waber predicted 315Uue to be the most stable ununennium isotope in 1971. ... the only stable isotope of aluminium has 13 protons and 14 neutrons, making a neutron-proton ratio of 1.077). However, isotopes ... iodine's only stable isotope has 53 protons and 74 neutrons, neutron-proton ratio of 1.396; gold's only stable isotope has 79 ...

Unbiunium

... of the quasi-stable neutron-rich isotope calcium-48 which could be used as a projectile to produce more neutron-rich isotopes ... Heavier isotopes are expected to be more stable; 320Ubu is predicted to be the most stable unbiunium isotope, but there is no ... This would present a grave problem for experiments aiming at synthesising isotopes of unbiunium if true, because the isotopes ... the only stable isotope of aluminium has 13 protons and 14 neutrons, making a neutron-proton ratio of 1.077). However, isotopes ...

Unbinilium

... of the quasi-stable neutron-rich isotope calcium-48 which could be used as a projectile to produce more neutron-rich isotopes ... Some heavier isotopes may be more stable; Fricke and Waber predicted 320Ubn to be the most stable unbinilium isotope in 1971. ... Also in 2020, the JINR plans to use a mixed-isotope 249-251Cf target and a 50Ti beam to aim for the isotope 298Ubn. Radioactive ... the only stable isotope of aluminium has 13 protons and 14 neutrons, making a neutron-proton ratio of 1.077). However, isotopes ...

K-Ca dating

Calcium is common in many minerals, with 40Ca being the most abundant naturally occurring isotope of calcium (96.94%), so use ... It is based upon measuring the ratio of a parent isotope of potassium (40K) to a daughter isotope of calcium (40Ca). This form ... 0.8952 Ca0 is the initial 40Ca/42Ca isotope ratio Ca is the 40Ca/42Ca isotope ratio K is the 40K/42Ca isotope ratio This ... Normalizing the 40Ca/42Ca ratio to non-radioactive isotopes (42Ca/44Ca), it was found that the isotopic composition of calcium ...

Donald J. DePaolo

... with a focus on isotopes of calcium [11]. 2008 DOE/Basic Energy Sciences/BESAC subcommittee on New Era Science 2005-2008 Chair ... Key principles of the Nd isotope system were laid out in his 1988 book, Neodymium Isotope Geochemistry: An Introduction. ... His research interests focus on using naturally occurring isotope variations to explore questions such as Origin of the deep- ... DePaolo and his then advisor Gerald Wasserburg made the first Nd isotope measurements on terrestrial igneous rocks [5]. An ...

Presolar grains

... a stable isotope of calcium which normally composes only 2% of the calcium abundance. The calcium in some presolar grains is ... However, Ti-44 has a half-life of only 59 years, and thus it is soon converted entirely to calcium-44. Excesses of the decay ... Improved SIMS experiments showed that the silicon isotopes within each SiC grain did not have solar isotopic ratios but rather ... 69, 3263-3281 Xenon has nine stable isotopes that differ in mass because they have different numbers of neutrons in their ...

Isodiapher

One large family of isodiaphers has zero neutron excess, N=Z. It contains many primordial isotopes of elements up to calcium. ...

Livermorium

The light isotopes can be made by fusing curium-243 with calcium-48. They would undergo a chain of alpha decays, ending at ... In 2011, experiments were conducted to create nihonium, flerovium, and moscovium isotopes in the reactions between calcium-48 ... of the heavy isotopes 294Lv and 295Lv could be accomplished by fusing the heavy curium isotope curium-250 with calcium-48. The ... molecular calcium difluoride has 4s and 3d involvement from the calcium atom. The heavier livermorium dihalides are predicted ...

Tectonic-climatic interaction

"Oxygen isotopes and the calcium ion record are essential indicators of climatic variability, while peaks in sulfate ions (SO4) ... 2009). "Stable isotope and petrologic evidence for open-system degassing during the climatic and pre-climatic eruptions of Mt. ... and testing the fluid or vapor for various elements and isotopes. While most volcanoes emit some mixture of the same few gasses ...

Surface exposure dating

This isotope may be produced by cosmic ray spallation of calcium or potassium. Climate proxy Lichenometry, measurement of ... The parent isotopes are the most abundant of these elements, and are common in crustal material, whereas the radioactive ... doi:10.1016/0016-7037(95)00429-7. Geomorphology and in situ cosmogenic isotopes. Cerling, T.E. and Craig, H. Annual Review of ... Stone, J; Allan, G; Fifield, L; Cresswell, R (1996). "Cosmogenic chlorine-36 from calcium spallation". Geochimica et ...

Proxy (climate)

Lisa Greer and Peter Swart, associates of University of Miami at the time, in regard to stable oxygen isotopes in the calcium ... The heavier isotope (18O) condenses more readily as temperatures decrease and falls as precipitation, while the lighter isotope ... The farther north elevated levels of an 18O isotope are detected signals a warming over time. In addition to oxygen isotopes, ... the vapour pressure of heavier isotopes is lower, so vapour contains relatively more of the lighter isotopes and when the ...

Reed Mangels

"Calcium fractional absorption and metabolism assessed using stable isotopes differ between postpartum and never pregnant women ... "Selenium utilization during human lactation using stable isotope tracers," Am J Clin Nutr. 1990;52:621-627. Profile page for Dr ...

Magic number (physics)

Examples of double magic isotopes include helium-4, oxygen-16, calcium-40, calcium-48, nickel-48, nickel-78, and lead-208. ... An example is calcium-40, with 20 neutrons and 20 protons, which is the heaviest stable isotope made of the same number of ... Calcium-48 is very neutron-rich for such a light element, but like calcium-40, it is made stable by being double magic. Nickel- ... Both calcium-48 and nickel-48 are double magic because calcium-48 has 20 protons and 28 neutrons while nickel-48 has 28 protons ...

Moscovium

In 2011, experiments were conducted to create nihonium, flerovium, and moscovium isotopes in the reactions between calcium-48 ... the heavier isotopes are the longer-lived ones. The hypothetical isotope 291Mc is an especially interesting case as it has only ... Two heavier isotopes of moscovium, 289Mc and 290Mc, were discovered in 2009-2010 as daughters of the tennessine isotopes 293Ts ... Although the known isotopes of moscovium do not actually have enough neutrons to be on the island of stability, they can be ...

Algeta

The active ingredient alpha particle emitting isotope radium-223 mimics calcium and forms complexes with hydroxyapatite at ...

Neodymium

The primary decay products before 142Nd are element Pr (praseodymium) isotopes and the primary products after are element Pm ( ... "The Effect of Neodymium (Nd3+) on Some Physiological Activities in Oilseed Rape during Calcium (Ca2+) Starvation" 10th ... promethium) isotopes. Neodymium was discovered by Baron Carl Auer von Welsbach, an Austrian chemist, in Vienna in 1885. He ... All of the remaining radioactive isotopes have half-lives that are shorter than eleven days, and the majority of these have ...

$Calcium isotope fractionation in ikaite and vaterite - ePIC$ Calcium isotope fractionation in ikaite and vaterite - ePIC

Gussone, N. , Nehrke, G. and Teichert, B. M. A. (2011): Calcium isotope fractionation in ikaite and vaterite , Chemical Geology ...

http://epic.awi.de/22825/

Radioactive Calcium Isotope 54Ca: Evidence For A New Nuclear Magic Number | Science 2.0

Radioactive Calcium Isotope 54Ca: Evidence For A New Nuclear Magic Number. By News Staff , October 9th 2013 01:57 PM , Print , ... A team of researchers from has provided evidence for a new nuclear magic number in the unstable, radioactive calcium isotope ... which they were able to study at the Radioactive Isotope Beam Factory (RIBF) at RIKEN, which produces the highest intensity ...

http://www.science20.com/news_articles/radioactive_calcium_isotope_54ca_evidence_new_nuclear_magic_number-122086

Amorphous Calcium Carbonate (Acc) Versus Crystalline Calcium Carbonate (Ccc) Using Stable Calcium Isotopes In Postmenopausal...

Amorphous Calcium Carbonate (Acc) Versus Crystalline Calcium Carbonate (Ccc) Using Stable Calcium Isotopes In Postmenopausal ... Mean change in fractional absorption of calcium from amorphous calcium carbonate (ACC) Vs. crystalline calcium carbonate (CCC ... Versus Crystalline Calcium Carbonate (Ccc) Using Stable Calcium Isotopes In Postmenopausal Women. ... versus crystalline calcium carbonate (CCC) using stable calcium isotopes in postmenopausal women. ...

https://clinicaltrials.gov/ct2/show/NCT01338142?recr=Open&intr=dietary+calcium&rank=9

Stable isotope profiles (Ca, O, C) through modern brachiopod shells of T. septentrionalis and G. vitreus: Implications for...

... and carbon isotopes as well as elemental concentration were measured. Calcium isotopes were analyzed on TIMS. The elemental ... However, in the light of the suggested 0.7‰ increase in calcium isotopes over the Phanerozoic such intra-specimen variations ... Studies, focused on oxygen and carbon isotopes over the last decades, are increasingly extending to the emerging calcium ... Implications for calcium isotope paleo-ocean chemistry. In: Chemical Geology, Vol. 269, Nr. 3-4: S. 210-219 ...

https://epub.ub.uni-muenchen.de/18781/index.html

Calcium-44 Carbonate Isotope | AMERICAN ELEMENTS ®

Calcium-44 Carbonate Isotope 44CaCO3 bulk & research qty manufacturer. Properties, SDS, Applications, Price. Free samples ... About Calcium-44 Carbonate Isotope. Calcium 44 Carbonate (Calcium-44) is a stable (non-radioactive) isotope of Calcium. It is ... Customers For Calcium-44 Carbonate Isotope Have Also Viewed. Calcium-44 Metal Isotope ... Calcium-44 Carbonate Isotope Synonyms. Enriched calcium carbonate, Calcium-44Ca carbonate, Labeled ca-44 carbonate, 44CaCO3, ...

https://www.americanelements.com/calcium-44-carbonate-isotope-14255-03-9

Isotopes of calcium - Wikipedia

https://en.wikipedia.org/wiki/Isotopes_of_calcium

Stable Calcium Isotopes in Urine as a Biomarker of Bone Mineral Balance in Spaceflight - Data.gov

Stable Calcium Isotopes in Urine as a Biomarker of Bone Mineral Balance in Spaceflight Metadata Updated: February 28, 2019 ... Stable Calcium Isotopes in Urine as a Biomarker ...HTML Techport Project JSON Metadata ... Stable Calcium Isotopes in Urine as a Biomarker ...HTML Techport Project XML Metadata ... Stable Calcium Isotopes in Urine as a Biomarker ...HTML Techport Project PDF Export ...

https://catalog.data.gov/dataset/stable-calcium-isotopes-in-urine-as-a-biomarker-of-bone-mineral-balance-in-spaceflight

Chemistry Clip Art: Bohr Diagrams for Atoms and Isotopes, Hydrogen to Calcium

Included in this download: - Set 1: blank Bohr diagrams for the 45 stable isotopes of the first 20 elements. - Set 2: Bohr ... Included in this download: - Set 1: blank Bohr diagrams for the 45 stable isotopes of the first 20 elements. - Set 2: Bohr ... Chemistry Clip Art: Bohr Diagrams for Atoms and Isotopes, Hydrogen to Calcium. ... The preview file is a .zip file containing six 6 sample images for one isotope of oxygen. Terms of Use. - You may use the ...

https://www.teacherspayteachers.com/Product/Chemistry-Clip-Art-Bohr-Diagrams-for-Atoms-and-Isotopes-Hydrogen-to-Calcium-1185361

Calcium isotope ratios in blood and urine: A new biomarker for the diagnosis of osteoporosis. - OceanRep

Kolevica, Ana, Glüer, C.-C., Both, M., Laue, C., Hehn, U. v., Kloth, S., Shroff, R. and Schrezenmeir, J. (2019) Calcium isotope ... Calcium isotope ratios in blood and urine: A new biomarker for the diagnosis of osteoporosis. ... We assessed the potential of Calcium (Ca) isotope fractionation measurements in blood (δ44/42CaBlood) and urine (δ44/42CaUrine ... Osteoporosis, Bone mineral density (BMD), Dual energy x-ray absorptiometry (DXA), Calcium isotopes, Bone biomarkers, Mass- ...

http://oceanrep.geomar.de/46246/

Researchers discover heaviest known calcium atom; eight new rare isotopes discovered in total

Researchers from Michigan State University and the RIKEN Nishina Center in Japan discovered eight new rare isotopes of the ... elements phosphorus, sulfur, chlorine, argon, potassium, scandium and, most importantly, calcium. ... The calcium isotopes are indicated from the last stable calcium-48 out to calcium isotopes that can only be reached with FRIB. ... were calcium-59 and calcium-60, which are now the most neutron-laden calcium isotopes known to science. The nucleus of calcium- ...

https://phys.org/news/2018-07-heaviest-calcium-atom-rare-isotopes.html

Calcium and strontium isotope systematics in the lagoon-estuarine environments of South Australia: Implications for water...

Calcium and strontium isotope systematics in the lagoon-estuarine environments of South Australia: Implications for water ...

http://explore.bl.uk/primo_library/libweb/action/display.do?tabs=moreTab&gathStatTab=true&ct=display&fn=search&doc=ETOCvdc_100076619622.0x000001&indx=1&recIds=ETOCvdc_100076619622.0x000001&recIdxs=0&elementId=0&renderMode=poppedOut&displayMode=full&frbrVersion=&rfnGrpCounter=1&dscnt=0&vid=BLVU1&fctV=Geochimica+et+cosmochimica+acta&mode=Basic&rfnGrp=1&tab=local_tab&fctN=facet_jtitle&vl

Nuclear physics - Latest research and news | Nature

Proton superfluidity and charge radii in proton-rich calcium isotopes Spectral study on 36,37,38Ca isotopes and calculations ... Zirconium isotope found to be a neutron poison Zirconium alloys are widely used as cladding material in nuclear reactors due to ... The magnetic moment of the neutron-rich exotic 75Cu nucleus is measured using rare isotope beams with a high spin alignment, ... Now, it is shown that 88Zr has a surprisingly high neutron capture cross-section exceeding that of other zirconium isotopes by ...

http://www.nature.com/subjects/nuclear-physics?error=cookies_not_supported&code=48e14b06-0f38-4a16-b231-4b33806782d4

Riethdorf, J-R et al. (2013): Stable oxygen isotopes and ratios of magnesium and calcium measured on Neogloboquadrina...

Stable oxygen isotopes and ratios of magnesium and calcium measured on Neogloboquadrina pachyderma sinistralis of sediment core ... Stable oxygen isotopes and ratios of magnesium and calcium measured on Neogloboquadrina pachyderma sinistralis of sediment core ... Neogloboquadrina pachyderma, Magnesium/Calcium ratio. N. pachyderma Mg/Ca. mmol/mol. Nürnberg, Dirk. ICP-OES, VARIAN 720-ES. ...

https://doi.pangaea.de/10.1594/PANGAEA.786249

Does Omeprazole Decrease Intestinal Calcium Absorption? - Full Text View - ClinicalTrials.gov

Fractional Calcium Absorption. Omeprazole. Stable Calcium Isotopes. Proton Pump Inhibitor. Intestinal Absorption of Calcium. ... Change in Intestinal Calcium Absorption From Baseline to One Month [ Time Frame: change in calcium absorption from baseline to ... Over the next 24 hours, we will collect all urine for measurement of its calcium content. During the first stay, we will ... Calcium, Dietary. Omeprazole. Bone Density Conservation Agents. Physiological Effects of Drugs. Anti-Ulcer Agents. ...

https://clinicaltrials.gov/show/NCT00582972

Scientists and NASA astronauts developing near real-time osteoporosis and bone cancer test

The functionality of the test, which measures changes in calcium isotope ratios, has been validated ... ... can discern the relative ratios of the calcium isotopes 42Ca and 44Ca in bone. The researchers found that lighter calcium ... Explore further: Researchers use calcium isotope analysis to predict myeloma progression Provided by: European Association of ... Researchers use calcium isotope analysis to predict myeloma progression. August 12, 2014 A team of researchers from Arizona ...

https://medicalxpress.com/news/2015-08-scientists-nasa-astronauts-real-time-osteoporosis.html

STAR Graduate Fellowships (2010) | Research Project Database | Grantee Research Project | ORD | US EPA

Tracking Arctic Climate Change With Calcium Isotopes Lehn, Gregory Owen Northwestern University August 2010 - August 2013 IL ...

https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/recipients.display/rfa_id/525

Fellowship - Global Change | Research Category | Research Project Database | Grantee Research Project | ORD | US EPA

Tracking Arctic Climate Change With Calcium Isotopes. Fellow. August 25, 2010 through August 24, 2013 ...

https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.researchCategory/rc_id/1122

Pagina 1 56 Recursos 1 20 Datasets With Pangaea Technical Keyword @tahiti310 Pangaea Publishing Network For Geoscientific &...

Calcium isotope fractionation in cultured, modern and fossil scleractinian coral skeleton Pretet, Chloé; Samankassou, Elias; ... Calcium isotope fractionation in cultured, modern and fossil scleractinian coral skeleton Pretet, Chloé; Samankassou, Elias; ... Calcium isotope fractionation in cultured, modern and fossil scleractinian coral skeleton Pretet, Chloé; Samankassou, Elias; ... parameters on calcium isotope fractionation (d44/40Ca) in scleractinian coral skeleton to better constrain this record. ...

http://biblioteca.universia.net/html_bura/verColeccion/params/id/35374.html

Science Highlights | Department of Energy

Why Are These Extremely Light Calcium Isotopes So Small? The radii of three proton-rich calcium isotopes are smaller than ... Improving Isotope Supply for a Cancer-Fighting Drug Production of actinium-227 ramps up for use in a drug to fight prostate ...

https://www.energy.gov/science/listings/science-highlights?page=3&prog=MSE

Publications | Hoekstra Group | QISD | Zernike (ZIAM) | Onderzoek | Rijksuniversiteit Groningen

Single-atom detection of calcium isotopes by atom-trap trace analysis. Physical Review A, 71(2), 023409. [023409]. DOI: 10.1103 ... Stolterfoht, N., Cabrera-Trujillo, R., Krstic, P. S., Hoekstra, R., Oehrn, Y., Deumens, E., & Sabin, J. R. (2010). Isotope ... Stolterfoht, N., Cabrera-Trujillo, R., Oehrn, Y., Deumens, E., Hoekstra, R., & Sabin, J. R. (2007). Strong isotope effects on ... A radioactive isotope trapping facility at KVI. Nuclear Physics A, 721, 1107C-1110C. DOI: 10.1016/S0375-9474(03)01296-X ...

https://www.rug.nl/research/zernike/quantum-interactions-and-structural-dynamics/hoekstra-group/publications

Ion ping pong reveals forces in atomic nuclei

Using this method the team was the first to determine the masses of the artificially produced isotopes calcium-53 and calcium- ... Masses of exotic calcium isotopes pin down nuclear forces. F. Wienholtz, D. Beck, K. Blaum, Ch. Borgmann, M. Breitenfeldt, R.B ... This was the breakthrough, which allowed the confirmation of the predictions for the exotic calcium isotopes of the Darmstadt ... Calculations at the Jülich Supercomputing Centre enabled them to predict the masses of much heavier calcium isotopes. Besides ...

https://idw-online.de/de/news539611

Spinosauridae - Wikipedia

A 2018 study by Hassler and colleagues of calcium isotopes in the teeth of North African theropods found that spinosaurids had ... "Calcium isotopes offer clues on resource partitioning among Cretaceous predatory dinosaurs". Proceedings of the Royal Society B ... Isotope ratios from teeth from Baryonyx, Irritator, Siamosaurus, and Spinosaurus were compared with isotopic compositions from ... The study found that, among theropods, spinosaurid isotope ratios were closer to those of turtles and crocodilians. Siamosaurus ...

https://en.wikipedia.org/wiki/Baryonychinae

Permian-Triassic extinction event - Wikipedia

"Calcium isotope constraints on the end-Permian mass extinction". Proceedings of the National Academy of Sciences of the United ... Scientists have found worldwide evidence of a swift decrease of about 1% in the 13C/12C isotope ratio in carbonate rocks from ... abrupt global decrease in the ratio of the stable isotope 13. C to that of 12. C, coincides with this extinction,[19][23][24][ ... That may have killed land plants and molluscs and planktonic organisms which had calcium carbonate shells. The eruptions would ...

https://en.wikipedia.org/wiki/Permian-triassic_extinction

Table of Contents - May 11, 2010, 107 (19) | PNAS

Calcium isotope constraints on the end-Permian mass extinction Jonathan L. Payne, Alexandra V. Turchyn, Adina Paytan, Donald J ...

http://www.pnas.org/content/107/19

Thunderbolts Forum • View topic - Major Sci News Blog

https://phys.org/news/2019-02-puzzling-sizes-extremely-calcium-isotopes.html. How to move electrons with light. https://phys. ... Researchers examine puzzling sizes of extremely light calcium isotopes. ... Nuclear interactions of ions accelerated at the surface of flaring stars can produce fresh isotopes in stellar atmospheres.[1 ... Zirconium isotope a master at neutron capture. https://phys.org/news/2019-01-zirconium-isotope-master-neutron-capture.html. ...

http://thunderbolts.info/forum/phpBB3/viewtopic.php?f=5&p=126218

We assessed the potential of Calcium (Ca) isotope fractionation measurements in blood (δ44/42CaBlood) and urine (δ44/42CaUrine) as a new biomarker for the diagnosis of osteoporosis. (geomar.de)
The present study investigates the influence of environmental (temperature, salinity) and biological (growth rate, inter-generic variations) parameters on calcium isotope fractionation (d44/40Ca) in scleractinian coral skeleton to better constrain this record. (universia.net)
Fractionation of Calcium Isotopes in Marine Coccolithophores. (awi.de)
Cellular calcium pathways: a key to understand Ca isotope fractionation in Emiliania huxleyi. (awi.de)
These stable isotopes occur in nature in various ratios depending on the setting and on fractionation processes that naturally separate isotopes from one another. (earthmagazine.org)

The radii of three proton-rich calcium isotopes are smaller than previously predicted because models didn't account for two nuclear interactions. (energy.gov)

Finally, we have begun exploring new technology to measure Ca isotope ratios using laser fluorescence rather than conventional mass spectrometry. (data.gov)
Calcium isotope ratios in blood and urine: A new biomarker for the diagnosis of osteoporosis. (geomar.de)
The δ44/42CaBlood and δ44/42CaUrine values correlated significantly (p = 0.004 to p = 0.031) with their corresponding DXA data indicating that both Ca isotope ratios are biomarkers for osteoporosis. (geomar.de)
Furthermore, Ca isotope ratios were significantly correlated to other clinical parameters ([Ca]Urine, ([Ca]Urine/Creatinine)) and biomarkers (CRP, CTX/P1NP) associated with bone mineralization and demineralization. (geomar.de)
The functionality of the test, which measures changes in calcium isotope ratios, has been validated on blood samples from NASA space shuttle astronauts. (medicalxpress.com)
Geochemists have developed extremely accurate ways of measuring calcium isotope ratios, for example for the study of sea shell deposits in sedimentary rocks. (medicalxpress.com)
These methods, using mass spectrometry, can discern the relative ratios of the calcium isotopes 42Ca and 44Ca in bone. (medicalxpress.com)
Working with NASA, the researchers measured calcium isotope ratios in urine from 30 shuttle astronauts, before, during, and after the flights. (medicalxpress.com)
By using calcium isotope ratios , healthcare providers may be able to optimize therapies for these debilitating illnesses in the future. (medicalxpress.com)
The key lies in measuring calcium: not simply how much is present in these bodily fluids, but also the ratios of different calcium isotopes. (earthmagazine.org)
Typical analyses include investigation of the minerals that make up the meteorite, their relative locations, orientations and chemical compositions, analysis of isotope ratios and radiometric dating. (wikipedia.org)

This is a randomized, double-blind, crossover bioavailability study comparing the fractional absorption of calcium from amorphous calcium carbonate (ACC) versus crystalline calcium carbonate (CCC) using stable calcium isotopes in postmenopausal women. (clinicaltrials.gov)
That's 12 more neutrons than the heaviest of the stable calcium isotopes, calcium-48. (phys.org)

Such particles are delivered as ion beams to the precision mass balance ISOLTRAP by the "isotope factory" ISOLDE at the European research centre CERN. (idw-online.de)
The Darmstadt team of Professor Wilfried Nörtershäuser carried out these measurements with colleagues from the Max Planck Institute for Nuclear Physics in Heidelberg, the Johannes Gutenberg University Mainz and numerous partners from other countries at the isotope factory ISOLDE at CERN. (idw-online.de)

Isotopes (atoms of the same element with different numbers of neutrons). (nasa.gov)

Unlike cosmogenic isotopes that are produced in the atmosphere, 41Ca is produced by neutron activation of 40Ca. (wikipedia.org)
The most interesting short-lived isotopes synthesized during a recent experiment at RIKEN's Radioactive Isotope Beam Factory (RIBF) were calcium-59 and calcium-60, which are now the most neutron -laden calcium isotopes known to science. (phys.org)
The magnetic moment of the neutron-rich exotic 75 Cu nucleus is measured using rare isotope beams with a high spin alignment, clarifying how the evolution of the nuclear shell and the shape deformations are connected. (nature.com)
After a recent application as a high-resolution mass separator for Penning-trap investigations (see idw press release "Laboratory Mass Measurement deepens Insight into Neutron Star Crusts" http://idw-online.de/en/news516628 ) the new device was successfully used to obtain the first mass measurements of calcium-53 and calcium-54. (idw-online.de)

Spectral study on 36,37,38 Ca isotopes and calculations based on density functional theory reveal the interplay between charge radii and nucleonic pairing correlations. (nature.com)
It has been developed to describe the exceptional behaviour of the radii of calcium isotopes. (idw-online.de)
Laser spectroscopy measurements on a long chain of cadmium isotopes now confirm a special nuclear model that has been developed to describe the exceptional behaviour of the radii of calcium isotopes. (idw-online.de)
Two years ago, physicists at TU Darmstadt and collaborators presented radii measurements of exotic calcium isotopes that could not be explained by any of the standard nuclear models. (idw-online.de)
Its parameters were specifically adapted to the progression of the calcium radii and could reproduce radii of some nuclei with similar sizes as calcium. (idw-online.de)
The predictive power of the new model has now been tested using radii measurements on more than 30 cadmium isotopes, which have about two-and-a-half times more mass than the calcium nuclei for which it was adapted. (idw-online.de)

The current focused on 54 Ca, which has 20 protons and 34 neutrons in its nucleus, which they were able to study at the Radioactive Isotope Beam Factory (RIBF) at RIKEN, which produces the highest intensity radioactive beams available in the world. (science20.com)

The study objective is, to evaluate the fractional absorption of calcium from amorphous calcium carbonate (ACC) Vs crystalline calcium carbonate (CCC) dietary supplements in postmenopausal women. (clinicaltrials.gov)
The purpose of this study is to measure the effect of omeprazole on intestinal calcium absorption in postmenopausal women. (clinicaltrials.gov)

In the future, the Facility for Rare Isotope Beams (FRIB) at Michigan State University will allow scientists might be able to make calcium-68 or even calcium-70, which may be the heaviest calcium isotopes . (phys.org)

Does Omeprazole Decrease Intestinal Calcium Absorption? (clinicaltrials.gov)
Existing literature makes it unclear whether proton pump inhibitor therapy truly decreases intestinal calcium absorption. (clinicaltrials.gov)
The primary study outcome is the change in intestinal calcium absorption following omeprazole therapy 40 mg daily for 30 days. (clinicaltrials.gov)
Can serum isotope levels accurately measure intestinal calcium absorption compared to gold-standard methods? (biomedcentral.com)

The researchers found that lighter calcium isotopes, such as 42Ca, are absorbed from the blood into the bone during bone formation . (medicalxpress.com)
Those patients who tended to lose the lighter 42Ca isotope seemed to be the ones where the cancer was the most active. (medicalxpress.com)

Researchers from Michigan State University and the RIKEN Nishina Center in Japan have discovered eight new rare isotopes, including the heaviest known calcium atom, calcium-60. (phys.org)
These are the heaviest isotopes of these elements ever found. (phys.org)
The heaviest isotope of an element represents the limit of how many neutrons the nucleus can hold. (phys.org)

DXA reflects the bone mass density (BMD) of selected bones only (femur and spine) whereas the Ca isotope biomarker reflects bone Ca loss of the whole skeleton. (geomar.de)

Set 2: Bohr diagrams (including number of protons and neutrons in the nucleus, and electrons) for the 45 stable isotopes of the first 20 elements. (teacherspayteachers.com)

Calcium isotopic values of G. vitreus are heavy in the central part of the shell and trend towards lighter values in peripheral areas approaching the maximum isotopic composition of T. septentrionalis. (uni-muenchen.de)
Calcium Carbonate 44 isotopic material is generally immediately available. (americanelements.com)
Isotope abundances are given by IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW). (wikipedia.org)

osteoporosis group: 2.43 ± 0.10 mmol/l (SD, n = 14) and were also not correlated to their corresponding Ca isotope compositions. (geomar.de)
Further studies are required to independently confirm that Ca isotope measurement provide a sensitive, non-invasive and radiation-free method for the diagnosis of osteoporosis. (geomar.de)
Our bones are largely built of calcium, and the turnover of calcium can indicate the development of bone diseases such as osteoporosis and the cancer multiple myeloma . (medicalxpress.com)
Physicians treating osteoporosis and other calcium disorders of bone, including multiple myeloma, have very few tools at their disposal to quickly determine whether the treatments they're providing are actually making a difference. (medicalxpress.com)
Unfortunately, clinicians do not routinely measure calcium absorption in patients with osteoporosis due to lack of an accurate, inexpensive and time-efficient method. (biomedcentral.com)

The results indicate an intra-specimen δ44/40Ca variation ranging from 0.16 to 0.33‰, pointing to a fairly homogenous distribution of calcium isotopes in brachiopod shells. (uni-muenchen.de)
The most abundant isotope, 40Ca, as well as the rare 46Ca, are theoretically unstable on energetic grounds, but their decay has not been observed. (wikipedia.org)
40Ca comprises about 97% of naturally occurring calcium. (wikipedia.org)

Studies, focused on oxygen and carbon isotopes over the last decades, are increasingly extending to the emerging calcium isotope system. (uni-muenchen.de)
Both species were sampled along the ontogenetic growth direction and calcium, oxygen, and carbon isotopes as well as elemental concentration were measured. (uni-muenchen.de)
The preview file is a .zip file containing six 6 sample images for one isotope of oxygen. (teacherspayteachers.com)
For the first 50 years, stable isotope geochemistry revolved around only a handful of low-mass, or light, stable elements: hydrogen, carbon, nitrogen, oxygen and sulfur. (earthmagazine.org)

Researchers from Michigan State University and the RIKEN Nishina Center in Japan discovered eight new rare isotopes of the elements phosphorus, sulfur, chlorine, argon, potassium, scandium and, most importantly, calcium. (phys.org)
What isotopes of Argon are present on Earth? (nasa.gov)
What is the primary isotope of Argon on Earth? (nasa.gov)

A team of researchers from has provided evidence for a new nuclear magic number in the unstable, radioactive calcium isotope 54C a. (science20.com)
Calcium 44 Carbonate (Calcium-44) is a stable (non-radioactive) isotope of Calcium. (americanelements.com)
Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 102,000 years. (wikipedia.org)

This was the breakthrough, which allowed the confirmation of the predictions for the exotic calcium isotopes of the Darmstadt theory group. (idw-online.de)
Physicists at the TU Darmstadt and their collaboration partners have performed laser spectroscopy on cadmium isotopes to confirm an improved model of the atomic nucleus. (idw-online.de)

To synthesize these new isotopes, researchers accelerated an intense beam of heavy zinc particles onto a block of beryllium. (phys.org)
Nonetheless, several researchers reported that single isotope methods correlate well with FCA. (biomedcentral.com)

Women will present to the research unit in the early morning and receive an oral and intravenous calcium tracer with breakfast. (clinicaltrials.gov)

Calcium (atomic symbol: Ca, atomic number: 20) is a Block S, Group 2, Period 4 element with an atomic weight of 40.078. (americanelements.com)
The precision of the isotope abundances and atomic mass is limited through variations. (wikipedia.org)
Isotopes are versions of the same element with different numbers of neutrons, meaning each isotope has a different atomic weight. (earthmagazine.org)

The intense zinc beam that enabled the discovery of calcium-59 and calcium-60 was provided by the RIBF, which is presently home to the world's most powerful accelerator facility in the field. (phys.org)

Calculations at the Jülich Supercomputing Centre enabled them to predict the masses of much heavier calcium isotopes. (idw-online.de)

In this cohort, however, FCA estimated by 3-h serum isotope levels did not correlate with gold-standard FCA measurements, whether determined with (ρ 0.02, p = 0.97) or without GFR values (ρ 0.03, p = 0.93). (biomedcentral.com)
This applies particularly to the minor variations of the charge radius between isotopes with an even and an odd mass number (odd-even-staggering) that is well resolved with the very precise new measurements. (idw-online.de)

However, in the light of the suggested 0.7‰ increase in calcium isotopes over the Phanerozoic such intra-specimen variations constrain ocean reconstruction. (uni-muenchen.de)

The nucleus of calcium-60 has 20 protons and twice as many neutrons. (phys.org)

We infer that subsequent magmatism led to the extensive release of carbon that may at least in part be recorded in the Shuram-Wonoka carbon isotope excursion. (deepdyve.com)

Ariel Anbar said:"We were able to confirm that Ca isotopes of the shuttle shifted as expected, meaning that they we could see in more or less real time the ongoing bone loss. (medicalxpress.com)
And besides showing promise for determining bone loss, stable isotopes may be useful as biomarkers for a variety of other health problems. (earthmagazine.org)

Creating and identifying rare isotopes is the nuclear-physics version of a formidable needle-in-a-haystack problem. (phys.org)
These isotopes play a key role in basic research in nuclear physics. (idw-online.de)

In its elemental form, calcium has a dull gray-silver appearance. (americanelements.com)
The beauty of isotopes is that they can compress complexity," says Joseph Skulan , a geochemist and biologist at Elemental Biomarkers, LLC, in Lodi, Wis. (earthmagazine.org)

Measurement of calcium absorption could be performed, to recommend interventions to increase absorption and reduce fracture risk. (biomedcentral.com)
The intravenous tracer allows a more precise measurement of FCA that accounts for renal calcium recycling and intestinal calcium secretion. (biomedcentral.com)

Using this method the team was the first to determine the masses of the artificially produced isotopes calcium-53 and calcium-54. (idw-online.de)

Two of the other new isotopes of sulfur and chlorine, S-49 and Cl-52, were not predicted to exist by a number of models that paint a lower resolution picture of nuclei. (phys.org)

A large (approximately 0.9%), abrupt global decrease in the ratio of the stable isotope 13 C to that of 12 C, coincides with this extinction, and is sometimes used to identify the Permian-Triassic boundary in rocks that are unsuitable for radiometric dating. (wikipedia.org)

The calcium atom has a radius of 197 pm and a Van der Waals radius of 231 pm. (americanelements.com)

And for more than 70 years since, the geosciences have relied on stable isotopes to evaluate everything from past and present climates to the diets of ancestral and modern humans. (earthmagazine.org)

Tarasov explained that proving the existence of a certain isotope of an element can advance scientists' understanding of the nuclear force. (phys.org)

A great deal more information can be extracted from the Ca isotope data we have gathered, a task that we have begun and will be our primary activity during the remainder of the project. (data.gov)
In particular, while on Ca isotopes show what on average crewmembers lose bone during spaceflight, our data reveal striking differences between the responses of individual crewmembers. (data.gov)
This lesson, in multiple steps, prepares students to analyze actual data from SOHO, in particular from the CELIAS (Charge, ELement and Isotope Analysis System) and EIT (Extreme-ultraviolet Imaging Telescope) instruments on the spacecraft. (nasa.gov)

Isotopes are different forms of elements found in nature. (phys.org)

Calcium 44 Carbonate is one of over 250 stable isotopes produced by American Elements for biological and biomedical labeling, as target materials and other applications. (americanelements.com)

Techniques using mass spectrometry and a double spike isotope dilution have been used for K-Ca age dating. (wikipedia.org)

Calcium is a reactive, soft metal that is a member of the alkaline earth elements. (americanelements.com)
Set 1: blank Bohr diagrams for the 45 stable isotopes of the first 20 elements. (teacherspayteachers.com)
CELIAS has measured elements and isotopes that were not observable or not resolvable from more abundant species prior to SOHO. (nasa.gov)

In the resulting debris of the collision, with a minuscule chance, a rare isotope such as calcium-60 is formed. (phys.org)

Even a few isotope values can provide a lot of information about a system," he says. (earthmagazine.org)