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.
Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)
Techniques used to determine the age of materials, based on the content and half-lives of the RADIOACTIVE ISOTOPES they contain.
The scientific study of past societies through artifacts, fossils, etc.
Common name for an extinct species of the Homo genus. Fossils have been found in Europe and Asia. Genetic evidence suggests that limited interbreeding with modern HUMANS (Homo sapiens) took place.
Remains, impressions, or traces of animals or plants of past geological times which have been preserved in the earth's crust.
The period of history before 500 of the common era.
The shaft of long bones.
Family of the suborder HAPLORHINI (Anthropoidea) comprising bipedal primate MAMMALS. It includes modern man (HOMO SAPIENS) and the great apes: gorillas (GORILLA GORILLA), chimpanzees (PAN PANISCUS and PAN TROGLODYTES), and orangutans (PONGO PYGMAEUS).

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)

Calcium isotopes refer to variants of the chemical element calcium (ca) that have different numbers of neutrons in their atomic nuclei, and therefore differ in their atomic masses while having the same number of protons. The most common and stable calcium isotope is Calcium-40, which contains 20 protons and 20 neutrons. However, calcium has several other isotopes, including Calcium-42, Calcium-43, Calcium-44, and Calcium-46 to -52, each with different numbers of neutrons. Some of these isotopes are radioactive and decay over time. The relative abundances of calcium isotopes can vary in different environments and can provide information about geological and biological processes.

Isotopes are variants of a chemical element that have the same number of protons in their atomic nucleus, but a different number of neutrons. This means they have different atomic masses, but share similar chemical properties. Some isotopes are stable and do not decay naturally, while others are unstable and radioactive, undergoing radioactive decay and emitting radiation in the process. These radioisotopes are often used in medical imaging and treatment procedures.

Radiometric dating is a method used to determine the age of objects, including rocks and other fossilized materials, based on the decay rates of radioactive isotopes. This technique relies on the fact that certain elements, such as carbon-14, potassium-40, and uranium-238, are unstable and gradually decay into different elements over time.

By measuring the ratio of the remaining radioactive isotope to the stable end product, scientists can calculate the age of a sample using the following formula:

age = (ln(Nf/N0)) / λ

where Nf is the number of atoms of the decayed isotope, N0 is the initial number of atoms of the radioactive isotope, and λ is the decay constant.

Radiometric dating has been used to date objects ranging from a few thousand years old to billions of years old, making it an essential tool for archaeologists, geologists, and other scientists who study the history of our planet.

I believe you may have made a typo in your question. "Archaeology" is the scientific study of past human cultures and societies through the recovery, examination, and analysis of material remains such as artifacts, buildings, biofacts (e.g., bones, shells), and cultural landscapes. It is not typically associated with medical definitions. If you intended to ask for a different term related to medicine or healthcare, please let me know so I can provide the correct information.

For more information about archaeology, you may be interested in visiting the World Archaeological Congress () or the Society for American Archaeology () websites to learn more about this fascinating field of study.

I'm sorry for any confusion, but "Neanderthals" is not a medical term. It belongs to the field of anthropology and paleontology. Neanderthals were a species of human that lived in Europe and Asia until about 40,000 years ago. They are named after the Neander Valley in Germany where their remains were first discovered. Neanderthals are known to have used tools, controlled fire, and possibly even had a form of language. They were not directly our ancestors but are instead a sister group to modern humans.

In medical terms, "fossils" do not have a specific or direct relevance to the field. However, in a broader scientific context, fossils are the remains or impressions of prehistoric organisms preserved in petrified form or as a mold or cast in rock. They offer valuable evidence about the Earth's history and the life forms that existed on it millions of years ago.

Paleopathology is a subfield of paleontology that deals with the study of diseases in fossils, which can provide insights into the evolution of diseases and human health over time.

I'm not a medical professional, but the term "History, Ancient" is not a medical term per se. However, in a broader context, it could refer to the study of ancient medical practices, theories, and beliefs that existed in civilizations prior to the Middle Ages or Classical Antiquity. This might include the examination of ancient texts, artifacts, and archaeological evidence to understand how illnesses were treated and viewed in these historical periods. It forms an essential part of the evolution of medical knowledge and practices over time.

The diaphysis refers to the shaft or middle portion of a long bone in the body. It is the part that is typically cylindrical in shape and contains the medullary cavity, which is filled with yellow marrow. The diaphysis is primarily composed of compact bone tissue, which provides strength and support for weight-bearing and movement.

In contrast to the diaphysis, the ends of long bones are called epiphyses, and they are covered with articular cartilage and contain spongy bone tissue filled with red marrow, which is responsible for producing blood cells. The area where the diaphysis meets the epiphysis is known as the metaphysis, and it contains growth plates that are responsible for the longitudinal growth of bones during development.

Hominidae, also known as the "great apes," is a family of primates that includes humans (Homo sapiens), orangutans (Pongo pygmaeus), gorillas (Gorilla gorilla and Gorilla beringei), bonobos (Pan paniscus), and chimpanzees (Pan troglodytes). This family is characterized by their upright walking ability, although not all members exhibit this trait. Hominidae species are known for their high intelligence, complex social structures, and expressive facial features. They share a common ancestor with the Old World monkeys, and fossil records suggest that this split occurred around 25 million years ago.

... , Calcium, Lists of isotopes by element). ... Calcium isotopes data from The Berkeley Laboratory Isotopes ... Calcium (20Ca) has 26 known isotopes, ranging from 35Ca to 60Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and ... Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. Unlike cosmogenic isotopes that ... All other calcium isotopes have half-lives measured in minutes or less. 40Ca comprises about 97% of naturally occurring calcium ...
... 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 ... Beryllium-7, beryllium-10, and calcium-41 are trace radioisotopes; calcium-48 and barium-130 only decay by double beta decay ...
Previously, we worked mainly with calcium. This is element 20 in the Periodic Table. It was used to bombard the target. And the ... Like all synthetic elements, it would have no stable isotopes. No isotopes of unbinilium are known. The below table contains ... Isotope masses from: M. Wang; G. Audi; A. H. Wapstra; F. G. Kondev; M. MacCormick; X. Xu; et al. (2012). "The AME2012 atomic ... Although this reaction is less asymmetric than the 249Cf+50Ti reaction, it also creates more neutron-rich unbinilium isotopes ...
The calcium must rob the third from the water. The isotope ratio in the calcite is therefore the same, after compensation, as ... Responsible for these fluctuations in oxygenation were likely driven by the Lomagundi carbon isotope excursion. δ18O Isotope ... Oxygen isotope analysis considers only the ratio of 18O to 16O present in a sample. The calculated ratio of the masses of each ... Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the ...
... isotope fractionation during mineral formation has led to several applications of calcium isotopes. In particular, the ... Other calcium preparations include calcium carbonate, calcium citrate malate, and calcium gluconate. The intestine absorbs ... 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 ...
2013). "Masses of exotic calcium isotopes pin down nuclear forces". Nature. Springer Science and Business Media LLC. 498 (7454 ... 2009-03-19). "Discovery of 229Rn and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements". ...
Mook, W. (2000). "Chemistry of carbonic acid in water". Environmental Isotopes in the Hydrological Cycle: Principles and ... calcium carbonate is prepared from calcium oxide. Water is added to give calcium hydroxide then carbon dioxide is passed ... non-calcium-based phosphate binders, particularly sevelamer. Excess calcium from supplements, fortified food, and high-calcium ... at least one study suggests that calcium carbonate might be as bioavailable as the calcium in cow's milk. Calcium carbonate is ...
Hassler, A.; Martin, J. E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (April 11, 2018). "Calcium isotopes ... Isotopes from Carcharodontosaurus and Spinosaurus fossils suggest that the Kem Kem Beds witnessed a temporary monsoon season ... Carcharodontosaurus was also a homeotherm with an endotherm-like thermophysiology as inferred by these isotopes meaning that ... "Oxygen and carbon isotope compositions of middle Cretaceous vertebrates from North Africa and Brazil: Ecological and ...
Hassler, A.; Martin, J. E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (11 April 2018). "Calcium isotopes ... A 2018 study by Auguste Hassler and colleagues of calcium isotopes in the teeth of North African theropods found that ... Isotope ratios from teeth from Baryonyx, Irritator, Siamosaurus, and Spinosaurus were compared with isotopic compositions from ... A 2010 publication by Romain Amiot and colleagues found that oxygen isotope ratios of spinosaurid bones indicates semiaquatic ...
Her recent work looks to optimize the production of transcurium isotopes. In 2018 she was recognized by Marquis Who's Who Top ... She studied the reactions of Berkelium-249 and Calcium-48. ... "Eleven new heaviest isotopes of elements $Z=105$ to $Z=117$ ... NC using the High Flux Isotope Reactor at Oak Ridge National Laboratory. Ezold has worked at Oak Ridge National Laboratory ... "Sensitivity Studies and Experimental Evaluation for Optimizing Transcurium Isotope Production". Nuclear Science and Engineering ...
Hassler, A.; Martin, J.E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (April 11, 2018). "Calcium isotopes ... Many spinosaurs likely had semiaquatic habits, as has been shown in studies using techniques like isotope analysis and bone ... "Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods". Geology. 38 (2): 139-142. Bibcode:2010Geo....38.. ...
A. Hassler; J. E. Martin; R. Amiot; T. Tacail; F. Arnaud Godet; R. Allain; V. Balter (2018). "Calcium isotopes offer clues on ... as indicated by calcium isotope values from tooth enamel is published by Hassler et al. (2018). A study on the early evolution ...
Species of Foraminifera incorporate oxygen as calcium carbonate in their shells. The ratio of the oxygen isotopes oxygen-16 and ... The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio ... This field is termed stable isotope geochemistry. Measurement of the ratios of naturally occurring stable isotopes (isotope ... the expression stable-isotope ratio is preferably used to refer to isotopes whose relative abundances are affected by isotope ...
W. Riepe; W. Kaiser (1966). "Massenspektrometrische Spurenanalyse von Calcium, Strontium und Barium in Natriumazid durch ... In addition to the use of stable isotopes, radioactive isotopes can be employed in isotope dilution which is often encountered ... All isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots ... Consider a natural analyte rich in isotope iA (denoted as A), and the same analyte, enriched in isotope jA (denoted as B). Then ...
A study focusing on calcium isotopes of extinct and extant elasmobranch sharks and rays revealed that megalodon fed at a higher ... Martin, J. E.; Tacail, T.; Sylvain, A.; Catherine, G.; Vincent, B. (2015). "Calcium isotopes reveal the trophic position of ... 0.9 Ma in age has been analyzed for isotope ratios of oxygen (18O/16O) and carbon (13C/12C), using a carbonate clumped-isotope ... "Stable isotope profiles in whale shark (Rhincodon typus) suggest segregation and dissimilarities in the diet depending on sex ...
All stable nuclides heavier than calcium-40 contain more neutrons than protons. Of the 80 elements with a stable isotope, the ... eight have six stable isotopes, ten have five stable isotopes, nine have four stable isotopes, five have three stable isotopes ... For the 80 elements that have one or more stable isotopes, the average number of stable isotopes is 251/80 ≈ 3.14 isotopes per ... Halbwertszeiten aller Isotope Exploring the Table of the Isotopes at the LBNL Current isotope research and information isotope. ...
Anbar has also been involved in development of method to use calcium isotopes to study bone disease. Anbar led the NASA ... His group was the first to report natural fractionation of molybdenum isotopes, including how and why molybdenum isotopes ... "Rapidly assessing changes in bone mineral balance using natural stable calcium isotopes". Proceedings of the National Academy ... "Stable isotopes offer novel methods of disease detection". www.earthmagazine.org. Retrieved 2021-07-21. "NASA Astrobiology ...
De La Rocha, Christina L.; DePaolo, Donald J. (2000-08-18). "Isotopic Evidence for Variations in the Marine Calcium Cycle Over ... Isotopes of silicon Isotope geochemistry Stable isotope ratio Isotope-ratio mass spectrometry Sutton, Jill N.; André, Luc; ... Silicon isotope biogeochemistry is the study of environmental processes using the relative abundance of Si isotopes. As the ... Currently, there are four main analytical methods for the measurement of Si isotopes: Gas Source Isotope-Ratio Mass ...
The isotope Calcium-44 can help to indicate variations in calcium carbonate over long timespans and help explain variants in ... Calcium is stored in geologic reservoirs, most commonly in the form of calcium carbonate or as calcium silicate. Calcium- ... Inputs of dissolved calcium (Ca2+) to the ocean include the weathering of calcium sulfate, calcium silicate, and calcium ... Calcium stable isotopes have been used to study inputs and outputs of dissolved calcium in marine environments. For example, ...
"One-day test using stable isotopes to measure true fractional calcium absorption". Journal of Bone and Mineral Research. 4 (4 ... While at the Mayo Clinic, Eastell developed new non-radioactive methods for measuring how calcium was absorbed from the diet ... Eastell has pioneered new techniques for measuring calcium uptake and vitamin D conversion and is a leading expert in ...
Diagnostic differences are that the olivine is richer in iron and calcium. The group also has a distinct oxygen isotope ...
Payne, J.; Turchyn, A.; Paytan, A.; Depaolo, D.; Lehrmann, D.; Yu, M.; Wei, J. (2010). "Calcium isotope constraints on the end- ... negative uranium isotope excursions, negative nitrogen isotope excursions, relatively positive carbon isotope ratios in ... Hafnium isotopes from syndepositional magmatic zircons found in ash beds created by this pulse of volcanic activity confirm its ... Stable carbon isotope fluctuations suggest that massive Siberian Traps activity recurred many times over the course of the ...
Payne, J.; Turchyn, A.; Paytan, A.; Depaolo, D.; Lehrmann, D.; Yu, M.; Wei, J. (2010). "Calcium isotope constraints on the end- ... Palfy J, Demeny A, Haas J, Htenyi M, Orchard MJ, Veto I (2001). "Carbon isotope anomaly at the Triassic-Jurassic boundary from ... However, the pattern of isotope shifts expected to result from a massive release of methane does not match the patterns seen ... Dickens GR, O'Neil JR, Rea DK, Owen RM (1995). "Dissociation of oceanic methane hydrate as a cause of the carbon isotope ...
Payne, J.; Turchyn, A.; Paytan, A.; Depaolo, D.; Lehrmann, D.; Yu, M.; Wei, J. (2010). "Calcium isotope constraints on the end- ... Calcium carbonate thus becomes undersaturated, and structures made of calcium carbonate are vulnerable to calcification stress ... or may precipitate into calcium carbonate (CaCO3). When the calcium carbonate is buried in the deep ocean, it can store the ... Calcium carbonate most commonly occurs in two common polymorphs (crystalline forms): aragonite and calcite. Aragonite is much ...
Moore, L. J.; Machlan, L. A. (1972). "High-accuracy determination of calcium in blood serum by isotope dilution mass ... Isotopic labeling Isotopes of hydrogen Isotopes of carbon; δ13C Isotopes of oxygen; δ18O Isotopes of nitrogen; δ15N Isotopes of ... Isotope Isotopologue Isotopomer Isotope analysis Isotopic signature Stable Isotope Ratio Isotope geochemistry Isotope-ratio ... Clumped isotopes present a distinct set of challenges for isotopic reference materials. By convention the clumped isotope ...
... is a scarce isotope of calcium containing 20 protons and 28 neutrons. It makes up 0.187% of natural calcium by mole ... Articles with short description, Short description matches Wikidata, Isotope content page, Isotopes of calcium). ... 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 ...
"Development of a sensitive setup for laser spectroscopy studies of very exotic calcium isotopes". Journal of Physics G: Nuclear ... Charge radii, spins and electro-magnetic moments for various isotopes, including magic isotopes Developing the laser ... "Evolution of nuclear structure in neutron-rich odd-Zn isotopes and isomers". Physics Letters B. 771: 385-391. doi:10.1016/j. ... specifically providing a sensitivity ideal for experiments on short-lived isotopes. Two beams are used in the technique: a ...
Calcium is common in many minerals, with 40 Ca 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 (40 K) to a daughter isotope of calcium (40 Ca). This ... 0.8952 Ca0 is the initial 40 Ca/42 Ca isotope ratio Ca is the 40 Ca/42 Ca isotope ratio K is the 40 K/42 Ca isotope ratio This ... Antonelli, Michael A.; Simon, Justin I. (2020-08-20). "Calcium isotopes in high-temperature terrestrial processes". Chemical ...
"Fibre formation in calcium caseinate influenced by solvent isotope effect and drying method - A neutron spectroscopy study". ... Calcium caseinate is one of several milk proteins derived from casein in skim and 1% milk. Calcium caseinate has a papery, ... Calcium caseinate is also soluble and does not clot in the stomach. Calcium caseinate is mostly composed of 3.5% moisture, 1.0 ... Caseins are found in milk which is held together by colloidal calcium phosphate. Calcium caseinate is generally stable at a pH ...
Pruss, Sara B.; Blättler, Clara L.; Macdonald, Francis A.; Higgins, John A. (2018). "Calcium isotope evidence that the earliest ... Sr-Nd isotopes and tectonic implications". Journal of Petrology. 42 (11): 2109-2143. doi:10.1093/petrology/42.11.2109. Meert et ...
Isotopes of calcium, Calcium, Lists of isotopes by element). ... Calcium isotopes data from The Berkeley Laboratory Isotopes ... Calcium (20Ca) has 26 known isotopes, ranging from 35Ca to 60Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and ... Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. Unlike cosmogenic isotopes that ... All other calcium isotopes have half-lives measured in minutes or less. 40Ca comprises about 97% of naturally occurring calcium ...
Cellular calcium pathways: a key to understand Ca isotope fractionation in Emiliania huxleyi. Gussone, N., Langer, Gerald, ... Gussone, N. , Langer, G. , Thoms, S. , Eisenhauer, A. , Riebesell, U. and Wefer, G. (2005): Cellular calcium pathways: a key to ... understand Ca isotope fractionation in Emiliania huxleyi. , MSG meeting Biogeochemical Controls on Palaeoceanographic Proxies, ...
Strontium isotope data enabled to show important differences of Ca sources for tree uptake. At the Ca-poorer site, deep soil ... Sr isotope data coupled with a modeling approach suggest that two different mineral sources exist in the soil profile: a ... isotope data in the soil profile (fine roots, exchangeable pool, bulk soil) was used to estimate the distribution of Sr and Ca ... it is important to determine calcium sources to the ecosystem and tree nutrition to better understand how forest ecosystems ...
Honours; Geology; strontium; calcium; isotopes; Coorong; salinity; water mixing; otoliths. Description: This item is only ... Calcium and strontium isotope constraints on water mixing, carbonate fluxes and fish migration in Coorong Lagoon, South ... Our modelling of Ca isotope data suggests that about 35 - 40% of Ca in the South Lagoon waters has been removed as CaCO3, which ... Finally, the results of this study also provide a basis for future applications of Sr and Ca isotopes that aim to reconstruct ...
Calcium 40 Isotope Lab & Bulk Quantity Manufacturer. Properties, Chemical Structure Drawing, Purity, Price, GHS, Synonyms, ... Calcium-40 Isotope. Name: Calcium-40 Isotope. CAS: 14092-94-5. EC Number: n/a. Chemical Formular: Ca. Appearance: White powder ... The best-absorbed form of calcium from a pill is a calcium salt like carbonate or phosphate.. Calcium gluconate and calcium ... Calcium-40. Calcium, isotope of mass 40. 40Ca. Ca 40. AC1O3TEI. DTXSID50161493 ...
The calcium isotope composition of carbonate producers can archive such stress because calcium isotope fractionation is ... The calcium isotope composition of carbonate producers can archive such stress because calcium isotope fractionation is ... The calcium isotope composition of carbonate producers can archive such stress because calcium isotope fractionation is ... The calcium isotope composition of carbonate producers can archive such stress because calcium isotope fractionation is ...
The calcium isotope systematics of the late Quaternary Dead Sea basin lakes. Title. The calcium isotope systematics of the late ... The calcium isotope systematics of the late Quaternary Dead Sea basin lakes ...
Calcium-Lipid Interactions Observed with Isotope-Edited Infrared Spectroscopy. Valentine ML, Cardenas AE, Elber R, Baiz CR. ...
Unexpectedly large charge radii of neutron-rich calcium isotopes. NUCLEAR REACTIONS U(p, X)43Ca/44Ca/45Ca/46Ca/47Ca/48Ca/49Ca/ ... New Precision Mass Measurements of Neutron-Rich Calcium and Potassium Isotopes and Three-Nucleon Forces. ATOMIC MASSES 51,52Ca ... Masses of exotic calcium isotopes pin down nuclear forces. ATOMIC MASSES 51,52,53,54Ca; measured TOF, ion cyclotron resonance ... Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes. NUCLEAR STRUCTURE 40,41,42,43,44,45,46,47,48,49,51,52, ...
The stable isotopes are similar to those for other OIS 3 European Neandertals and indicate a relatively high trophic level for ... Les isotopes stables sont similaires à ceux des Néandertaliens européens du stade isotopique 3 et indiquent un niveau trophique ... Les valeurs associées des isotopes stables du carbone et de lazote sont de - 19,0 ‰ pour le δ13C et 11,6 ‰ pour le δ15N. Ce ... years B.P.], and stable isotope values of δ13C = - 19.0‰ and δ15N = 11.6‰. The direct radiocarbon date makes it the oldest ...
2.4 Calcium isotope measurement. The first precise Ca isotope measurements where performed in the late 1970s by TIMS at the ... Zhu and MacDougall, 1998] P. Zhu; J. MacDougall Calcium isotopes in the marine environment and the oceanic calcium cycle, ... Jochum Calcium isotopes (δ44/40Ca) in MPI-DING reference glasses, USGS rock powders and various rocks: evidence for Ca isotope ... Capinas Calcium isotope ratios in the worlds largest rivers: a constraint on the maximum imbalance of oceanic calcium fluxes, ...
The influence of seawater carbonate chemistry, mineralogy, and diagenesis on calcium isotope variations in Lower-Middle ... Latest Wuchiapingian to Earliest Triassic Conodont Zones and δ13Ccarb Isotope Excursions from Deep-Water Sections in Western ...
Dive into the research topics of Joint Associations of Obesity and Cardiorespiratory Fitness with Coronary Artery Calcium ... Joint Associations of Obesity and Cardiorespiratory Fitness with Coronary Artery Calcium Composition: Is There Evidence for Fat ...
Isotopes: Thulium has 32 isotopes whose half-lives are known, with mass numbers 146 to 177. Naturally occurring thulium ... Cadmium - Calcium - Californium - Carbon - Cerium - Cesium - Chlorine - Chromium - Cobalt - Copernicium - Copper - Curium ... Radioactive isotope 170Tm is produced by bombarding thulium in a nuclear reactor. It has a half-life of 128 days and is used as ... Abundance and Isotopes. Abundance earths crust: 0.5 parts per million by weight, 50 parts per billion by moles ...
... calcium ratios (strontium atoms per 1,000 calcium atoms) in the range of 0.4-16. Higher strontium:calcium ratios can be found ... these isotopes are considered stable (MacMillan et al., 2000). Radioactive isotopes of strontium, particularly82Sr, 85Sr, 89Sr ... Since calcium plays an important and necessary part in the removal of strontium, sufficient calcium concentration is needed to ... Since no strontium removal was observed in the absence of calcium in the control samples, the study suggested that calcium ...
... the heaviest but unstable isotope of hydrogen) and a helium-4 nucleus (the most common isotope of helium). At the same time, ... All other elements, such as the calcium in your bones and the iron in your blood, were forged in stars that formed much later. ... That reaction is the fusion of lithium-7 with hydrogen-2 (a rare but stable isotope of hydrogen) to produce a neutron and two ... The claim is that the observations of the abundance ratios of the isotopes of the three lightest elements match the predictions ...
isotopes Argon 18. Ar. saw-both isotopes 4 Potassium 19. K saw-both isotopes Calcium 20. Ca. saw-both isotopes Scandium 21. Sc ... isotopes Astatine 85. At. msi isotopes Radon 86. Rn. msi isotopes 7 Francium 87. Fr. msi isotopes Radium 88. Ra. msi isotopes ... isotopes Boron 5. B saw-ival-both isotopes Carbon 6. C saw-ival-both isotopes Nitrogen 7. N saw-ival-both isotopes Oxygen 8. O ... isotopes Actinium 89. Ac. msi isotopes Thorium 90. Th. saw-both isotopes Protactinium. 91. Pa. saw-both isotopes Uranium 92. U ...
Carbon and nitrogen are essential elements for organisms; their stable isotope ratios (13C : 12C, 15N : 14N) are useful tools ... Calcium carbonate corrosivity in an Alaskan inland sea W. Evans, J. T. Mathis, and J. N. Cross ... A nitrate budget of the Bohai Sea based on an isotope mass balance model Shichao Tian, Birgit Gaye, Jianhui Tang, Yongming Luo ... Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean - how biological processes exacerbate ...
2011) Calcium Isotope Fractionation in Alpine Plants Hindshaw R, Reynolds B, Wiederhold J, Kretzschmar R & Bourdon B (2011) In ... 2012) Stable Calcium Isotope Fractionation in Basaltic Catchments (Iceland) Hindshaw RS, Reynolds BC, Burton KW & Bourdon B ( ... 2017) Tin Isotope Constraints on the Formation of the Moon Fitoussi C, Wang X & Bourdon B (2017) Mo Isotopes as a Tracer of the ... 2008) Calcium Isotope Variations at the Damma Glacier, Switzerland Hindshaw R, Reynolds B, Bourdon B, Wiederhold J & ...
117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown. Tennessine is a member of Group 17 of ... berkelium-249 atoms with calcium-48 ions to create two forms of tennessine. The Ts-294 isotope, with a half-life of 78 ... 117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown. Tennessine is a member of Group 17 of ...
"Generally speaking, African soils are very short on carbon and nutrients - phosphorus, calcium, nitrogen, magnesium, etc - ... agricultural soil specialist and Head of the radio isotopes laboratory at the University of Antananarivo, Madagascar. " ...
... based on whether the platelets they precipitated were poorer or richer in the rarer heavy isotope of carbon compared to calcium ... Heavy isotopes undergo all of the same chemical reactions as light isotopes, but, simply because they have slightly different ... This process proceeds far more rapidly for the CO2 containing the light isotope of carbon, causing the isotopic composition to ... The standard proxy is the oxygen isotope ratios in tiny zooplankton called foraminifera. There are more than 50,000 different ...
Calcium-Sensing Receptor Biochemistry, Genetics and Molecular Biology 45% * Isotopes of Calcium Medicine and Dentistry 35% ... Extracellular Calcium Homeostasis. Whole body calcium homeostasis is maintained by the regulated secretion of parathyroid ... Calcium-Sensing Receptor Nomenclature, Pharmacology, and Function. Leach, K., Hannan, F. M., Josephs, T. M., Keller, A. N., ... Calcium-sensing receptor as the phosphate sensor in secondary hyperparathyroidism. Ward, D. & Ashton, N. ...
Hydration Properties of Mechanically Activated Muscovite in the Presence of Calcium Oxide Geng Yao, Tao Cui, Yuewei Su, Cosmos ... Aqueous suspensions of mechanically activated muscovite were blended with 10, 20, or 30 wt.% calcium oxide and then allowed... ... or siliceous and aluminous materials that are by themselves of little or no cementitious value but that react with calcium ... or siliceous and aluminous materials that are by themselves of little or no cementitious value but that react with calcium ...
Compare Nitrogen vs Calcium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic ... Isotopes and Nuclear Properties. Nitrogen. has 2. stable naturally occuring isotopes while Calcium. has 5. stable naturally ... ChromiumCalcium. vs ManganeseCalcium. vs IronCalcium. vs CobaltCalcium. vs NickelCalcium. vs CopperCalcium. vs ZincCalcium. vs ... Calcium. vs BerylliumCalcium. vs MagnesiumCalcium. vs CalciumCalcium. vs StrontiumCalcium. vs BariumCalcium. vs Radium ...
... the calcium-aluminium-rich inclusions (CAIs). ... Asteroid ages united by new isotope standard By Steve Down2012- ...
Al developed methods for whole-body calcium isotope distribution, crucial for dietary absorption studies; provided the first ...
Why some researchers think calcium is the future of batteries Rechargeable versions of these low-cost power sources can be made ... Lead isotopes and trace elements in medieval coins reveal unexpected silver source ... Why some researchers think calcium is the future of batteries Rechargeable versions of these low-cost power sources can be made ...
Calcium Absorption during Fruit Development in Honeycrisp Apple Measured Using 44Ca as a Stable Isotope Tracer ... Calcium (Ca) sprays are commonly used to control Ca-related disorders such as bitter pit in apple. Increases in the frequency ... Using a stable isotope tracer approach, we present evidence that Ca is absorbed throughout fruit development. These findings ... Here, the absorption efficiency was measured using 44Ca stable isotope applied to 30 individual fruit at five different times ...
  • Radiological forms and/or radioactive isotopes of strontium are addressed in a separate document (Health Canada, 2009). (canada.ca)
  • For strontium evaporative cooling worked very badly: the most abundant isotope, 88 Sr with 83% abundance, essentially does not collide. (2physics.com)
  • There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and 46Ca), plus one isotope (48Ca) with such a long half-life that for all practical purposes it can be considered stable. (wikipedia.org)
  • The stable isotopes are similar to those for other OIS 3 European Neandertals and indicate a relatively high trophic level for this individual. (openedition.org)
  • 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)
  • The effect of water evaporation, which leads to oversaturation of carbonate minerals (i.e. calcite and aragonite) in lagoon waters, has also an impact on the Ca isotope composition of local waters, as these yielded systematically heavy δ44/40Ca signatures due to removal of light Ca isotopes into CaCO3. (edu.au)
  • The calcium isotope composition of carbonate producers can archive such stress because calcium isotope fractionation is sensitive to precipitation rate. (northwestern.edu)
  • Coccoliths had been divided into two groups - a light and a heavy group - based on whether the platelets they precipitated were poorer or richer in the rarer heavy isotope of carbon compared to calcium carbonate formed by physical (abiotic) processes. (scienceblog.com)
  • They were able to show that the ratio of calcification to photosynthesis determines whether the platelets are isotopically heavier or lighter than abiogenic calcium carbonate. (scienceblog.com)
  • The shells are made of calcium carbonate, which means that they mainly consist of the elements calcium, carbon and oxygen. (lu.se)
  • Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. (wikipedia.org)
  • Radioactive antimony (Sb) isotopes were produced at the radioactive ion beam facility ISOLDE-CERN. (bnl.gov)
  • Inhalation when the calcium from the mother's are radioactive. (cdc.gov)
  • Radioactive isotope 170 Tm is produced by bombarding thulium in a nuclear reactor. (chemicool.com)
  • Cellular calcium pathways: a key to understand Ca isotope fractionation in Emiliania huxleyi. (awi.de)
  • Calcium isotope ratios increase ~60 thousand years prior to the event. (northwestern.edu)
  • Moreover, decreasing calcium isotope ratios during the event provide evidence for ocean alkalinization, which could have shifted air-sea carbon dioxide partitioning. (northwestern.edu)
  • Ca and Mg isotope ratios of river waters appear to be also lithology-controlled. (academie-sciences.fr)
  • The claim is that the observations of the abundance ratios of the isotopes of the three lightest elements match the predictions of the big bang model. (answersingenesis.org)
  • The standard proxy is the oxygen isotope ratios in tiny zooplankton called foraminifera. (scienceblog.com)
  • Because the foraminifera shells fairly faithfully record the ratios of oxygen isotopes in seawater, they provide a signal that can be used to infer ancient temperatures. (scienceblog.com)
  • These tiny differences in reaction rates cause the products of reactions to have different isotope ratios than the source materials. (scienceblog.com)
  • Where more than one isotope exists, the value given is the abundance weighted average. (rsc.org)
  • However, we had experience working with low abundance isotopes and took a closer look at 84 Sr. We asked Roman Ciuryło to calculate the scattering properties of 84 Sr by scaling the known properties of the abundant isotopes with the mass. (2physics.com)
  • Joint Associations of Obesity and Cardiorespiratory Fitness with Coronary Artery Calcium Composition: Is There Evidence for Fat-but-Fit? (bris.ac.uk)
  • Dive into the research topics of 'Joint Associations of Obesity and Cardiorespiratory Fitness with Coronary Artery Calcium Composition: Is There Evidence for Fat-but-Fit? (bris.ac.uk)
  • This process proceeds far more rapidly for the CO 2 containing the light isotope of carbon, causing the isotopic composition to drift to the heavier variant. (scienceblog.com)
  • Systematics of energies of the first 2+ states and S(2n) from experiment (N=22-36) and theory in N=22-54 Ca isotopes. (bnl.gov)
  • Generally speaking, African soils are very short on carbon and nutrients - phosphorus, calcium, nitrogen, magnesium, etc - resulting in low microorganism biological activity. (cirad.fr)
  • Secondary mineral assemblages include vein filling clay with embedded iron oxides, a calcium sulfate, amorphous silica, chlorapatite, halite and carbonates. (nasa.gov)
  • Elements exist in different variations - isotopes - and it is the proportion of oxygen isotopes in the foram shells that, for example, reveals changes in global temperature and in global ice volume. (lu.se)
  • The proportion of oxygen isotopes in the shells reveals changes in global temperature and in global ice volume. (lu.se)
  • the South Lagoon is mostly hypersaline, as a result of seawater - groundwater mixing and evaporation, and inputs from both components were significant, confirmed by Sr isotope signatures in waters and otoliths. (edu.au)
  • Because dentine is not remodeled and contains collagen, nitrogen stable isotope compositions (δ15 N) reflect nursing and weaning events, life history traits that would otherwise be impossible to retrieve in such elusive marine animals. (bvsalud.org)
  • In 2010 scientists from the Joint Institute for Nuclear Research in Dubna, Russia, announced that they had bombarded (2009) berkelium-249 atoms with calcium-48 ions to create two forms of tennessine. (infoplease.com)
  • Since then, ten elements have been Bose-condensed: all stable alkali-metal atoms and hydrogen, metastable helium, chromium, ytterbium [4] and very recently calcium [5]. (2physics.com)
  • Atoms with two electrons in their outer shell, as ytterbium and the alkaline-earth elements, have properties unlike any other of the condensed species: a non-magnetic ground-state (for bosonic isotopes), metastable states and a combination of broad and narrow linewidth optical transitions. (2physics.com)
  • In big bang nucleosynthesis, lithium-7 (the dominant isotope of lithium) is produced through the fusion of tritium (the heaviest but unstable isotope of hydrogen) and a helium-4 nucleus (the most common isotope of helium). (answersingenesis.org)
  • That reaction is the fusion of lithium-7 with hydrogen-2 (a rare but stable isotope of hydrogen) to produce a neutron and two helium-4 nuclei. (answersingenesis.org)
  • Fluorine gas is primarily used to make certain chemical compounds, the most important of which is uranium hexafluoride, used in separating isotopes of uranium for use in nuclear reactors and nuclear weapons. (cdc.gov)
  • Our modelling of Ca isotope data suggests that about 35 - 40% of Ca in the South Lagoon waters has been removed as CaCO3, which in turn has implications for understanding local carbon cycling in the lagoon. (edu.au)
  • Li, B, Mg and Ca isotopes became of increasing interest during the last decade due to their potential for better constraining the carbon cycle and nutrient cycling. (academie-sciences.fr)
  • The proportion of carbon isotopes in the shells tells us about changes in ocean circulation, but also of local changes in upwelling areas. (lu.se)
  • Here, we synthesize morphometric observations of planktic foraminifera with multi-archive calcium isotope records from Gubbio, Italy and the Western Interior Seaway spanning Cretaceous Ocean Anoxic Event 2 (~94 million years ago). (northwestern.edu)
  • Unlike cosmogenic isotopes that are produced in the atmosphere, 41Ca is produced by neutron activation of 40Ca. (wikipedia.org)
  • Production of very neutron rich isotopes: What should we know? (wikipedia.org)
  • The structures of composite materials comprising phosphopolypeptides and calcium phosphate with very different neutron scattering length densities are well suited to being studied by neutron scattering and diffraction methods. (lu.se)
  • Forest ecosystems are often found on acid soils where calcium availability depends on two main inputs (atmospheric deposition and the weathering of soil minerals) and on the biological cycling of nutrients. (hal.science)
  • The aim of this study was to study and compare Ca pools and cycling in two mature forest ecosystems (Clermont en Argonne and Azerailles) developed on two contrasting polycyclic soils (Lorraine plateau, eastern France) and identify the Ca sources contributing to ecosystem functioning. (hal.science)
  • At the soil-water-plant scale, Li and B isotopes are powerful tools for the understanding of processes leading to clay mineral formation in soils. (academie-sciences.fr)
  • article{CRGEOS_2012__344_11-12_704_0, author = {Anne-D\'esir\'ee Schmitt and Nathalie Vigier and Damien Lemarchand and Romain Millot and Peter Stille and Fran\c{c}ois Chabaux}, title = {Processes controlling the stable isotope compositions of {Li,} {B,} {Mg} and {Ca} in plants, soils and waters: {A} review}, journal = {Comptes Rendus. (academie-sciences.fr)
  • TY - JOUR AU - Anne-Désirée Schmitt AU - Nathalie Vigier AU - Damien Lemarchand AU - Romain Millot AU - Peter Stille AU - François Chabaux TI - Processes controlling the stable isotope compositions of Li, B, Mg and Ca in plants, soils and waters: A review JO - Comptes Rendus. (academie-sciences.fr)
  • Les valeurs associées des isotopes stables du carbone et de l'azote sont de - 19,0 ‰ pour le δ 13 C et 11,6 ‰ pour le δ 15 N. Ce spécimen est ainsi le plus vieux Néandertalien daté directement même si, pour un intervalle d'âge comparable, d'autres dates 14 C de fossiles sont connues et acceptées. (openedition.org)
  • Les isotopes stables sont similaires à ceux des Néandertaliens européens du stade isotopique 3 et indiquent un niveau trophique relativement élevé pour le Néandertalien des Rochers-de-Villeneuve. (openedition.org)
  • À l'échelle locale eau-sol-plante, les isotopes du Li et du B sont des outils puissants permettant de comprendre la formation des minéraux argileux dans les sols. (academie-sciences.fr)
  • Dans des bassins versants plurilithologiques, les isotopes du B et du Li sont contrôlés par les taux d'altération des minéraux silicatés ainsi que par les temps de résidence des eaux au sein des bassins versants. (academie-sciences.fr)
  • 3 En plus de la datation, l'analyse nous permet de connaître les valeurs des isotopes stables du carbone et de l'azote pour ce fémur. (openedition.org)
  • METHODS: Here, we present a multiproxy approach to investigate the use of Ca isotope compositions (δ44/42 Ca) in relation to δ15 N and laser ablation profiles for different trace metal (Ba, Mg, Sr, Zn) concentrations across the dentine of a single individual of the common bottlenose dolphin Tursiops truncatus. (bvsalud.org)
  • Total serum calcium is less difficult to measure than the ionized calcium component is, and ionized calcium measurements are rarely needed if serum protein concentrations can be measured. (medscape.com)
  • This produces the isotope plutonium-239, which has a half-life of 24,400 years. (rsc.org)
  • Plutonium metal is made by reducing plutonium tetrafluoride with calcium. (rsc.org)
  • No acute-, intermediate-, or chronic- bone is being used to build the bones of plutonium isotopes are 87.7, 24,100, the fetus. (cdc.gov)
  • All other elements, such as the calcium in your bones and the iron in your blood, were forged in stars that formed much later. (answersingenesis.org)
  • We need the right amount of calcium in our blood to maintain healthy bones, muscles and blood vessels. (manchester.ac.uk)
  • Unfortunately for people suffering from kidney disease, too much PTH can be released causing their bones to lose calcium and their blood vessels to become dangerously hardened. (manchester.ac.uk)
  • Once in the body, Sr-90 acts like calcium and is readily incorporated into bones and teeth, where it can cause cancers of the bone, bone marrow, and soft tissues around the bone. (cdc.gov)
  • Examples of fluorides include sodium fluoride and calcium fluoride. (cdc.gov)
  • Sodium fluoride readily dissolves in water, but calcium fluoride does not. (cdc.gov)
  • 40Ca comprises about 97% of naturally occurring calcium. (wikipedia.org)
  • Murray), we established water mixing models using Sr and Ca isotopes (i.e. measuring 87Sr/86Sr and δ44/40Ca signatures) and investigated the sensitivity of these isotope proxies to salinity changes along the lagoon (ranging from fresh to hypersaline, i.e., 0 to ~120 PSU). (edu.au)
  • Many biofluids are super saturated with respect to hydroxyapatite (HA) by forming complexes between phosphopolypeptides/phosphoproteins and amorphous calcium phosphate (ACP). (lu.se)
  • Ca and Mg isotope signatures in soil and waters vary seasonally, depending on the vegetation growth cycle and rain events. (academie-sciences.fr)
  • In mixed-lithology basins, B and Li isotopes are controlled by alteration rates of silicate minerals and the residence time of waters within the watershed. (academie-sciences.fr)
  • Les signatures isotopiques en Ca et en Mg dans les sols et les eaux de rivière varient saisonnièrement, en fonction du cycle de croissance des végétaux et des épisodes pluvieux. (academie-sciences.fr)
  • In most laboratories, autoanalyzers are used to measure the total serum calcium level accurately and reproducibly, although atomic absorption spectrophotometers probably provide even greater accuracy. (medscape.com)
  • In the context of global change (decreasing atmospheric inputs, increasing biomass exportation, climate change), it is important to determine calcium sources to the ecosystem and tree nutrition to better understand how forest ecosystems will respond to these changes over time. (hal.science)
  • "There are several reasons for Africa's poor agricultural yields, including a lack of infrastructures, production methods that remain traditional, climate change, and above all very low soil fertility", adds Tantely M. Razafimbelo, agricultural soil specialist and Head of the radio isotopes laboratory at the University of Antananarivo, Madagascar. (cirad.fr)
  • The project combines paleontological studies of the calcareous nannoplankton, geochemistry on traditional (Ccarb, Corg) and non-traditional isotope system (Ca, Sr) and climate models. (lu.se)
  • The metal can be isolated by reduction of the anhydrous fluoride with calcium metal, or by the reduction of the oxide with lanthanum metal. (chemicool.com)
  • Calcium fluoride is the compound in the common minerals fluorite and fluorspar. (cdc.gov)
  • As the name suggests, CaR is constantly measuring the levels of calcium in the blood to allow the body to either increase or decrease those levels as appropriate. (manchester.ac.uk)
  • Heavy isotopes undergo all of the same chemical reactions as light isotopes, but, simply because they have slightly different masses, they do so at slightly different rates. (scienceblog.com)
  • note = "Funding Information: We thank NU IRMS Laboratory Manager Andrew Masterson who assisted with stable isotope data collection. (northwestern.edu)
  • The Ts-294 isotope, with a half-life of 78 milliseconds, decayed through alpha-particle emission into dubnium (element 105), while the lighter Ts-293, with a half-life of 14 milliseconds, decayed down to roentgenium (element 111). (infoplease.com)
  • In total 4 correlated alpha-decay chains following the reaction calcium (Z=20) on americium (Z=95) were observed and attributed to element 115. (lu.se)
  • Naturally occurring thulium consists of its one stable isotope, 169 Tm. (chemicool.com)
  • The fundamental role of CaR in the regulation of PTH secretion / calcium homeostasis is seen most clearly in neonatal severe hyperparathyroidism where babies born with a homozygous, loss-of-function CaR mutation secrete a massive excess of PTH. (manchester.ac.uk)
  • Calcium concentration, both total and free, is characterized by a high physiological variation, depending on age, sex, physiological state (eg, pregnancy), and even season (owing to the seasonal variation of vitamin D, which is directly involved in the regulation of calcium concentration). (medscape.com)
  • Measurement of the ionized calcium component is generally obtained in specialized laboratories and through a special procedure. (medscape.com)
  • Here we describe the physical and chemical properties of several manganese-calcium-rich siderites. (nasa.gov)
  • We know that the gland uses a special protein called the calcium-sensing receptor (CaR). (manchester.ac.uk)
  • Isotope studies of the Mn rich siderite are also consistent with formation from hydrothermal fluids with an upper T constraint of ~170 C. (nasa.gov)
  • Oftentimes new isotopes cooled to quantum degeneracy have, with their unique properties, opened the doors to the investigation of novel phenomena. (2physics.com)
  • In short, first reports on the isotopes 287-115 and 288-115 have been put forward by the so-called Dubna-Livermore collaboration already in 2004. (lu.se)