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)
Beliefs and practices concerned with producing desired results through supernatural forces or agents as with the manipulation of fetishes or rituals.
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.
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.
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.
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.
Animals that have no spinal column.
A common name for fish of the family Percidae, belonging to the suborder Percoidei, order PERCIFORMES.
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.
The hard rigid covering of animals including MOLLUSCS; TURTLES; INSECTS; and crustaceans.
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.
Positively charged particles composed of two protons and two NEUTRONS, i.e. equivalent to HELIUM nuclei, which are emitted during disintegration of heavy ISOTOPES. Alpha rays have very strong ionizing power, but weak penetrability.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.
Techniques for labeling a substance with a stable or radioactive isotope. It is not used for articles involving labeled substances unless the methods of labeling are substantively discussed. Tracers that may be labeled include chemical substances, cells, or microorganisms.
Actinium. A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, atomic number 89, and atomic weight 227.0278. Its principal isotope is 227 and decays primarily by beta-emission.
Principles, models, and laws that apply to complex interrelationships and interdependencies of sets of linked components which form a functioning whole, a system. Any system may be composed of components which are systems in their own right (sub-systems), such as several organs within an individual organism.
Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.
BODY MASS INDEX in children (ages 2-12) and in adolescents (ages 13-18) that is grossly above the recommended cut-off for a specific age and sex. For infants less than 2 years of age, obesity is determined based on standard weight-for-length percentile measures.
Characteristic events occurring in the ATMOSPHERE during the interactions and transformation of various atmospheric components and conditions.
A space in which the pressure is far below atmospheric pressure so that the remaining gases do not affect processes being carried on in the space.
The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)
Activities performed by humans.
The collection, writing, and editing of current interest material on topics related to biomedicine for presentation through the mass media, including newspapers, magazines, radio, or television, usually for a public audience such as health care consumers.
Facilities that convert NUCLEAR ENERGY into electrical energy.
Nuclear power accident that occurred following the Tohoku-Kanto earthquake of March 11, 2011 in the northern region of Japan.
The transmission and reproduction of transient images of fixed or moving objects. An electronic system of transmitting such images together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound. (From Webster, 3rd ed)
The observation, either continuously or at intervals, of the levels of radiation in a given area, generally for the purpose of assuring that they have not exceeded prescribed amounts or, in case of radiation already present in the area, assuring that the levels have returned to those meeting acceptable safety standards.
The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).
Unstable isotopes of cesium that decay or disintegrate emitting radiation. Cs atoms with atomic weights of 123, 125-132, and 134-145 are radioactive cesium isotopes.
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)
The spontaneous transformation of a nuclide into one or more different nuclides, accompanied by either the emission of particles from the nucleus, nuclear capture or ejection of orbital electrons, or fission. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
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)
Isotopes that exhibit radioactivity and undergo radioactive decay. (From Grant & Hackh's Chemical Dictionary, 5th ed & McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Finely divided solid matter with particle sizes smaller than a micrometeorite, thus with diameters much smaller than a millimeter, moving in interplanetary space. (NASA Thesaurus, 1994)
The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.
The addition of descriptive information about the function or structure of a molecular sequence to its MOLECULAR SEQUENCE DATA record.
The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
An order of amoeboid EUKARYOTES characterized by reticulating pseudopods and a complex life cycle with an alternation of generations. Most are less than 1mm in size and found in marine or brackish water.
Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Carbonic acid calcium salt (CaCO3). An odorless, tasteless powder or crystal that occurs in nature. It is used therapeutically as a phosphate buffer in hemodialysis patients and as a calcium supplement.
The relationships of groups of organisms as reflected by their genetic makeup.
A lithium salt, classified as a mood-stabilizing agent. Lithium ion alters the metabolism of BIOGENIC MONOAMINES in the CENTRAL NERVOUS SYSTEM, and affects multiple neurotransmission systems.
The science of the earth and other celestial bodies and their history as recorded in the rocks. It includes the study of geologic processes of an area such as rock formations, weathering and erosion, and sedimentation. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
An element in the alkali metals family. It has the atomic symbol Li, atomic number 3, and atomic weight [6.938; 6.997]. Salts of lithium are used in treating BIPOLAR DISORDER.

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)

article{6543017c-6a84-44b2-a897-83c36d0dfe34, abstract = {A negative shift in the calcium isotopic,br/,composition of marine carbonate rocks,br/,spanning the end-Permian extinction horizon,br/,in South China has been used to argue,br/,for an ocean acidification event coincident,br/,with mass extinction. This interpretation,br/,has proven controversial, both because the,br/,excursion has not been demonstrated across,br/,multiple, widely separated localities, and because,br/,modeling results of coupled carbon and,br/,calcium isotope records illustrate that calcium,br/,cycle imbalances alone cannot account,br/,for the full magnitude of the isotope excursion.,br/,Here, we further test potential controls,br/,on the Permian-Triassic calcium isotope,br/,record by measuring calcium isotope ratios,br/,from shallow-marine carbonate successions,br/,spanning the Permian-Triassic boundary in,br/,Turkey, Italy, and Oman. All measured sections,br/,display negative shifts in δ44/40Ca of up,br/,to 0.6‰. ...
Brachiopod shells are widely used as an archive to reconstruct elemental and isotopic composition of seawater. Studies, focused on oxygen and carbon isotopes over the last decades, are increasingly extending to the emerging calcium isotope system. To date, only little attention has been paid to test the reliability of fossil brachiopods on their modern counterparts. In this context, the present study investigates two modern brachiopods, Terebratulina septentrionalis (eastern Canada, 5-30 m depth, 7.1 °C seasonal temperature variation, two-layer shell) and Gryphus vitreus (northern Mediterranean, 200 m depth, constant all-year round temperature, three-layer shell). Both species were sampled along the ontogenetic growth direction and calcium, oxygen, and carbon isotopes as well as elemental concentration were measured. Calcium isotopes were analyzed on TIMS. The elemental composition was analyzed by LA-ICP-MS and ICP-AES. The results indicate an intra-specimen δ44/40Ca variation ranging from ...
Researchers have come one step closer to understanding unstable atomic nuclei. The protons and neutrons inside the atomic nucleus exhibit shell structures in a manner similar to electrons in an atom.
Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the seawater calcium isotopic ratio suggesting changes in seawater calcium concentrations. The most pronounced increase in the ??44/40Ca value of seawater (of 0.3 per mil) occurred over roughly 4 million years following a period of low values around 13 million years ago. The major change in marine calcium corresponds to a climatic transition and global change in the carbon cycle and suggests a reorganization of the global biogeochemical system....
Abstract: Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48 Ca. One member of the triplet, Λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar Λ8542 shifts are consistent with an interpretation in terms of 48 Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg iiΛ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48 Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ...
Of 26 screened patients, 17 were included. The median age was 44 (range 20-75) years. The median time interval between baseline and first follow-up was 13 (6-27) weeks. Compared to baseline, an 81% decrease was observed for median total testosterone (to 3.4 nmol/L (0.4-12.2); P , 0.0001) and free testosterone (to 0.06 nmol/L (0.01-0.18); P , 0.0001). Median total estradiol decreased by 71% (to 17.6 pmol/L (4.7-35.6); P , 0.0001). Increased serum calcium (P , 0.0001) and phosphate (P = 0.0016) was observed, paralleled by decreased PTH (P = 0.0156) and 1,25-dihydroxyvitamin D3 (P = 0.0134). The stable calcium isotope ratio (δ44/42Ca) decreased (P = 0.0458), indicating net calcium loss from bone. Bone-specific alkaline phosphatase and osteocalcin decreased (P , 0.0001 and P = 0.0056, respectively), periostin tended to decrease (P = 0.0500), whereas sclerostin increased (P , 0.0001), indicating suppressed bone formation. Serum bone resorption markers (TRAP, CTX) were unaltered. ...
Darmstadt, September 5, 2018. 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. It has been developed to describe the exceptional behaviour of the radii of calcium isotopes. The results published in Physical Review Letters could be a step towards a global model of the nuclear structure. The charge radius, which is the spatial expansion of the positive nuclear charge, is one of the fundamental parameters of an atomic nucleus, and leaves its traces in the optical spectrum of an atom even though this is created by the electrons in the atomic shell. The spectrum of every type of atom is as unique as a fingerprint, and can be measured precisely using laser light. This provides information on the size and properties of the atomic nucleus. The technique is also suitable for very short-lived nuclei which decay within a blink of an eye. Laser spectroscopy measurements on a long chain ...
mothra, extra knight, please! All this acrimony puzzles me, because, as I said earlier, I really am on your side here, and I am trying to help. And I am not calling you names, am I? Thats a waste of time…and we may not have much time to waste.. I actually think, if we can get past the rhetoric, that we are on the same page here. There is a lot we can agree on I think:. 1. Radiation causes biological harm, and for a given tissue type, the level of that harm is as far as we know proportional to the total amount of radiation energy absorbed by that tissue over time. 2. There is a lot of radioactive material coming from Fukushima, on par with Chernobyl, and maybe for a long time to come, or if the worst happens, in another explosive event. So far, though, a great deal of the release has been into the ocean, though there are continuing releases into the atmosphere. We are being kept in the dark by the Japanese authorities both deliberately and by ineptitude. We need to mount a stronger campaign of ...
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In a crossover, single blind, randomized trial the calcium bioavailability of two calcium supplements will be compared.That is AlgaeCal®(Algaecal Inc, Vancouver, Canada)(1 dose is 3 capsules of 180 mg calcium), derived from ocean algae and the proprietary calcium supplement Caltrate 600® (Wyeth Consumer Healthcare, Inc).. After a screening visits 20 healthy male subjects aged 20-50 years will spend a day at the research center to examine calcium bioavailability data. They will be randomized to consume either first the AlgaeCal® supplement or the Caltrate 600® supplement. After a one week wash-out period subjects will be supplemented with the other supplement. During the examination day blood and urine samples will be collected before and until eight hours after the supplementation for analyses of calcium, creatinine, phosphorus, albumin and 25 Hydroxy vitamin D. Subjects are instructed to avoid taking calcium and/or vitamin D supplements 1 week before and during the entire study period. In ...
TY - JOUR. T1 - The effect of vitamin D on calcium absorption in older women. AU - Gallagher, J. Christopher. AU - Yalamanchili, Vinod. AU - Smith, Lynette M.. PY - 2013/4/1. Y1 - 2013/4/1. UR - http://www.scopus.com/inward/record.url?scp=84878071037&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=84878071037&partnerID=8YFLogxK. U2 - 10.1097/01.ogx.0000429299.32340.7c. DO - 10.1097/01.ogx.0000429299.32340.7c. M3 - Comment/debate. AN - SCOPUS:84878071037. VL - 68. SP - 287. EP - 289. JO - Obstetrical and Gynecological Survey. JF - Obstetrical and Gynecological Survey. SN - 0029-7828. IS - 4. ER - ...
This study will enroll at least 60 pregnant women in a randomized cross-over study in Dhaka, Bangladesh. Each participant will be randomized to one of 3 calcium doses: 500 mg, 1000 mg, 1500 mg elemental Ca per day. Each participant will undergo two calcium absorption tests, one with a micronutrient supplement powder containing non-encapsulated (non-coated) calcium and the other with a micronutrient supplement powder containing encapsulated calcium at the same dose. The absorption tests will be separated by a 2-week washout period. Fractional calcium absorption will be measured using the dual stable isotope method. For each test, the formulation will be administered orally for 9 days; on the 10th day, a 44Ca- labeled stable isotope will be given orally and a 42Ca-labeled stable isotope dose will be given intravenously. Urine will be collected for 48 hours to measure calcium absorption ...
TY - JOUR. T1 - Secretion and excretion of calcium by the human gastrointestinal tract. AU - Heaney, Robert P.. AU - Skillman, Thomas G.. PY - 1964/7/1. Y1 - 1964/7/1. N2 - Fecal excretion of calcium of endogenous origin has been measured in 52 studies in 33 adult human subjects, under full metabolic balance conditions. Endogenous fecal calcium averaged .130 ± .047 Gm. per day, was positively correlated with both fecal calcium and dietary calcium and was inversely correlated with fractional calcium absorption. The regression line relating endogenous fecal calcium with fractional absorption allowed estimates for total intestinal calcium secretion at both zero and 100 per cent absorption; from these estimates it was calculated that approximately 15 per cent of the total intestinal calcium secretion was nonabsorbable even under conditions when dietary calcium was completely absorbed (presumably because it enters the gut caudad of the absorption sites). Total intestinal calcium secretion, ...
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1. The localisation of intestinal calcium absorption in the rat was studied by means of radioactive45Calcium. Rats were killed 20, 40, and 60 min after oral administration of45CaCl2-solution.45Ca-acti...
Highly efficient and low cost removal of radioactive 90Sr from high level liquid waste (HLLW) is a key step for safe and long-term storage of nuclear waste. Herein, for the first time, we reported a novel flower-like α-ZrP material, which was prepared via a simple and economical low-temperature solid state s
Mice injected with the bone-seeking isotope, 89Sr, were depleted of marrow erythropoietic progenitor cells but maintained normal or near-normal numbers of splenic erythropoietic progenitor cells, lymphoid tissue alloantigen-sensitive units responsible for graft-vs-host reactions, and splenic antigen-sensitive units responsive to sheep erythrocytes which give rise to antibody-producing cells. The ability of such mice to reject marrow allografts was suppressed. It is concluded that a separate class of marrow-dependent immunocompetent cells exist, now called M cells, which are responsible for rejection of allogeneic dispersed hemopoietic cells.. ...
Sebezhko OI, Petukhov VL, Sokolov VA, Korotkevich OS, Kamaldinov EV, Syso AI, Konovalova TV, Marmuleva NI, Narozhnykh KN, Barinov EY, Osadchuk LV. Comparative assessment of radioactive strontium and cesium contents in the feedstuffs and dairy products from various regions of Western Siberia. Res J Pharm Biol Chem Sci 8(3): 1753-1759, 2017. ...
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High-throughput screening of a library of compounds using an ATP-evoked calcium uptake assay in a stable hP2X4-HEK293 cell line allowed us to identify BX430, a phenylurea endowed with potent (IC50 = 0.54 µM) and selective antagonist properties on recombinant as well as native human P2X4 receptor channels.. Confirming the high calcium permeability of human P2X4 channels reflected by a fractional calcium current close to 15% (Egan and Khakh, 2004), ATP-evoked calcium responses were robust and reproducible, with only a minor contribution by endogenous P2Y receptors in this hP2X4-HEK293 cell line. Therefore, the sensitive screening method described here has the potential to identify novel lead compounds that block P2X4 receptor channels. Moreover, with simple adjustments of the recording parameters, such a calcium-based cellular assay can also be used to screen for positive allosteric modulators of P2X4 function (see Fig. 1B). The blocker BX430, which was selected among other inhibitory lead ...
Its definitely worth making your own corn tortilla chips--these low-fat baked tortilla chips have a more pronounced corn flavor than store-bought tortilla chips.
While many North Americans think of tacos as having crisp, fried shells, authentic Mexican tacos are made with soft, fresh corn tortillas. The traditional preparation is the smart choice, as unfried corn tortillas are low in fat and made with whole grains.
Here in DC, I have had a hard time finding really good corn tortillas, and am exploring making them myself. Does anyone have experience with this, and would you recommend buying a tortilla press, or is covering a cutting board...
A baked dish of browned ground beef, tomatoes and enchilada sauce wrapped in corn tortillas then topped with more enchilada sauce and cheese
Determining calcium bioavailability is important in establishing dietary calcium requirements. In infants and small children, previously conducted mass balance studies have largely been replaced by stable isotope-based studies. The ability to assess calcium absorption using a relatively short 24-hour urine collection without the need for multiple blood samples or fecal collections is a major advantage to this technique. The results of these studies have demonstrated relatively small differences in calcium absorption efficiency between human milk and currently available cow milk-based infant formulas. In older children with a calcium intake typical of Western diets, calcium absorption is adequate to meet bone mineral accretion requirements.
Full nutritional breakdown of the calories in Chicken Enchilladas w/Corn Tortillas based on the calories and nutrition in each ingredient, including Mission Yellow Corn Tortillas Extra Thin (2 tortillas = 1 serving), Kroger Hot Pepper Blend Shredded Cheese, Chicken Breast (cooked), no skin, roasted, Daisy Light Sour Cream, Kroger Neufchatel Cheese (33% less fat) and the other ingredients in this recipe.
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If you are to look at the ingredients of a standard bag of corn tortillas (Mission brand, for example), lime is often one of the flavoring ingredients. I decided to put my own spin on it by adding some fresh tangelo juice for a hint of sweet goodness in the tortillas. (Tangelos are a cross between tangerines and oranges.) ...
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Although randomized controlled trials have thus far not provided the definitive evidence that low calcium intake is a cause of low 25(OH)D in humans, this is far more likely to be because no trials have adequately addressed the question than because the interaction does not exist. Experimental evidence in rats has demonstrated the interaction beyond doubt, and the physiology - which very clearly implies the interaction - appears to be, for all relevant intents and purposes, identical between humans and rats. It is thus extremely unlikely in my opinion that low calcium intake is not a cause of low 25(OH)D in humans.. The practical implications are two-fold. First, we are in desperate need of clinical trials to address this question adequately. In the mean time, if someone has low 25(OH)D, they should assess their calcium intake.. Obtaining a birds-eye view of ones calcium intake is relatively easy to do without the help of a professional, any fancy software, or even an internet database. Most ...
When I was in my 20s and first living on my own, my apartment was down the street from an amazing little Mexican Taco Stand. I used to eat there at least once a week, and often much more! One of my favorite Tacos was Chorizo and Potato. I dont know why, but I havent had one in years, so I decided to make some. The problem was that I only had a few Corn Tortillas that were a bit dried out so they were only good for chips, so I improvised and ended up making this deconstructed Chorizo and Potato Taco as a soup! Oh my, I was so happy with the flavors of this soup and it was the perfect post-Christmas meal. I made a basic Potato Soup with Onions and Chicken Broth and then cooked the Chorizo on the side and swirled it in when it was done. And, you could easily make it Vegan with Soy Chorizo and Vegetable Broth. I topped it with a quick Pico de Gallo and I crisped up the last few Corn Tortillas in Oil after cutting them in thin little strips. You can easily substitute some crumbled Tortilla Chops It ...
I make tacos almost every week since my husband and I moved from California to New England. I have become quite adept at making corn tortillas...
These soft tacos use lean ground sirloin and low-fat corn tortillas as sensible substitutions. Skip the sour cream and guacamole -- opt for a fiery salsa instead.
Looking for online definition of calcium metabolism in the Medical Dictionary? calcium metabolism explanation free. What is calcium metabolism? Meaning of calcium metabolism medical term. What does calcium metabolism mean?
The effect of 1-alpha-hydroxycholecalciferol and parathyroidectomy on cardiovascular lesions in uraemia: an experimental study in the rat ...
Systemic Radiation Therapy Using radioactive isotopes to treat certain cancers is called systemic radiation therapy. The radioactive isotopes may be swallowed, given intravenously or injected into the body. For example, radioactive iodine (I-131) capsules are given to patients to treat some types of thyroid cancer. Another example is the use of intravenous radioactive strontium to treat pain due to cancer that has spread to the bone. Radioimmunotherapy Recent research has focused on the use of radioactive monoclonal antibodies, also called radiolabeled antibodies, to deliver doses of radiation directly to a tumor. This process is known as radioimmunotherapy. Antibodies are made by the body in response to the presence of antigens (substances recognized as foreign by the immune system). Large quantities of particular types of antibodies, called monoclonal antibodies, can be made in the laboratory. These monoclonal antibodies can be attached to radioactive isotopes in a process called ...
Experienced eaters and chefs alike know that corn tortilla soup traditionally has a thin, spicy broth. If you prefer a thicker soup (not just chunky) with more of a stew or chowder like consistency, any number of thickening methods can be employed without changing the delicious flavor. Corn starch, roux, tapioca flour, arrowroot flour, and potato starch can all be used safely with good results. Tortilla soup can also be reduced down through slow cooking if you hesitate to add additional carbohydrates.. ...
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A healthy, balanced diabetes diet should include plenty of nonstarchy vegetables and moderate amounts of whole grains, fruits, starchy vegetables, lean...
Been taking leftovers for awhile and its getting old. Tired of taking homemade BBQ, chicken breast, hamburgers. I know about corn tortilla roll ups but you ...
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calcium How intracellular Calcium signaling, gradient and its role as a universal intracellular regulator points to design http://reasonandscience.heavenforum
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Calcium is an element is vital for the health of many living things, and has a range of industrial uses. Calcium is never found...
WebMD provides information about interactions between Calcium Creamies Oral and antacids-h2-antagonistsppis-selected-cephalosporins.
Page one so far. Ive still got to tidy it up and add a bit more line work. I am enjoying doing this little project. its a good bi ...
... 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 have very long half-lives and thus ...
... and all isotopes of radium are radioactive. Calcium-48 is the lightest nuclide to undergo double beta decay.[21] Calcium and ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... 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 have very long half-lives and thus ...
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". ...
Silicon and calcium are purely alpha process elements. Magnesium can be burned by proton capture reactions. As for oxygen, some ... Alpha process elements (or alpha elements) are so-called since their most abundant isotopes are integer multiples of four, the ... mass of the helium nucleus (the alpha particle); these isotopes are known as alpha nuclides. Stable alpha elements are: C, O, ...
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 ...
A 2018 study by the French palaeontologist Auguste Hassler and colleagues of calcium isotopes in the teeth of North African ... Hassler, A.; Martin, J. E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (2018). "Calcium isotopes offer ... "Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods". Geology. 38 (2): 139-142. Bibcode:2010Geo....38.. ... based on the oxygen isotope composition of spinosaurid teeth from around the world compared with that of other theropods and ...
A 2018 study by Auguste Hassler and colleagues of calcium isotopes in the teeth of North African theropods found that ... Hassler, A.; Martin, J. E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (2018). "Calcium isotopes offer ... 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 optimise the production of transcurium isotopes. In 2018 she was recognised 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 $Z=117$ ... She earned her master's degree in 1992 at California State University, Northridge using the High Flux Isotope Reactor at Oak ... "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 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 ... Borrell, Asunción; Aguilar, Alex; Gazo, Manel; Kumarran, R. P.; Cardona, Luis (1 December 2011). "Stable isotope profiles in ...
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 ...
Isotopes. Main article: Isotopes of calcium. Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and ... Calcium 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.[5] The intestine absorbs ... Calcium Forte)(Calcium Lactate Gluconate 2.94g +Calcium Carbonate 0.3 g) کاربرد کلسیم در کشاورزی(نقش در تغذیه گیاهی)[ویرایش]. ...
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 ...
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- ... 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 ...
"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 ...
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 ...
Multiple laboratories adopted this technique, using FAB-MS to measure isotope ratios in isotope tracer studies of calcium, iron ... "Determination of Stable Isotopes of Calcium in Biological Fluids by Fast Atom Bombardment Mass Spectrometry". Analytical ... to analyze isotopes of calcium. Glycerol was not used; samples in aqueous solution were deposited on the sample target and ... "Isotope Fractionation and Hydride Interference in Metal Isotope Analysis by Fast Atom Bombardment-Induced Secondary Ion Mass ...
As a result of the collection of samples from the explosion by U.S. Air force pilots, scientists found traces of the isotopes ... Radioactive and contaminated with calcium carbonate, the "Mike" samples were extremely difficult to handle. Scientists at Los ... Knolls Atomic Power Laboratory (KAPL) (2010). Nuclides and Isotopes - Chart of the Nuclides (17th ed.). Schenectady, N.Y.: ... "Time-resolved record of 236U and 239,240Pu isotopes from a coral growing during the nuclear testing program at Enewetak Atoll ( ...
42 is the atomic mass of one of the naturally occurring stable isotopes of calcium. The angle rounded to whole degrees for ...
Sulfur is the most common mineral in fumarolic deposits; but arsenic, boron, calcium and silicon are also found. Such fumarolic ... Domo Tinto rocks have been analyzed for isotope and chemical composition studies. They are potassium-rich calc-alkaline rocks ...
"Calcium Fractional Absorption and Metabolism Assessed Using Stable Isotopes Differ between Postpartum and Never Pregnant Women ... "Selenium utilization during human lactation by use of stable-isotope tracers". The American Journal of Clinical Nutrition. 52 ( ...
Oxygen isotope analyses performed on conodont apatite show a ≈1.5‰ negative shift. This negative δ18O excursion suggests a ... Major changes in organisms responsible for calcium carbonate production occurred during the CPE. A halt of carbonate ... The base of the CPE is marked by a ≈4‰ negative shift in carbon stable isotopes (δ13C) of fossil molecules (n-alkanes) from ... A ≈1.5‰ negative shift in oxygen stable isotopes (δ18O) of conodont apatite suggests a global warming. ...
Because strontium is so similar to calcium, it is incorporated in the bone. All four stable isotopes are incorporated, in ... Of the unstable isotopes, the primary decay mode of the isotopes lighter than 85Sr is electron capture or positron emission to ... isotopes of rubidium, and that of the isotopes heavier than 88Sr is electron emission to isotopes of yttrium. Of special note ... In the presence of calcium ions, strontium commonly forms coprecipitates with calcium minerals such as calcite and anhydrite at ...
Their spherical shape indicates that the source of calcium was mass diffusion, as opposed to fluid flow. The larger boulders, 2 ... Pearson, M.J., and C.S. Nelson, 2005, Organic geochemistry and stable isotope composition of New Zealand carbonate concretions ... This is demonstrated by studies of their composition; specifically the magnesium and iron content, and stable isotopes of ...
Carbonates, opal, and white covers of possibly aluminum sulfate and calcium sulfate have been formed. Gypsum formed from the ... Crustal materials were involved in the formation of the magma, with Sr isotope data indicating crustal assimilation. Fumarolic ...
Lighter oxygen isotopes (16O) are left behind in coral during periods of very heavy rainfall. Since hurricanes are the main ... By studying the calcium carbonate in coral rock, past sea surface temperature and hurricane information can be revealed. ... Rocks contain certain isotopes of elements, known as natural tracers, which describe the conditions under which they formed. ... Recent studies of the 18O and 13C isotopes found in stalagmites in Belize show that tropical cyclone events can leave markers ...
They are an indicator of a high calcium content in the ore. Lead isotope analysis is a technique for determining the source of ... Also, lead isotope composition is unchanged in smelting process. The amount of each of the four stable isotopes of lead are ... Lead isotope composition is a signature of ore deposits and varies very little throughout the whole deposit. ... Stos-Gale Z. ,A. "Lead isotope studies of metals and the metal trade in the Bronze Age Mediterranean" in Henderson J. (Ed.) ...
report water in low-calcium pyroxene grains. The water's isotope level corresponds with inner Solar System and carbonaceous ... After its return to Earth in 2010, the mineralogy, petrography, chemistry, and isotope ratios of these particles have been ... chondrite water isotope levels. Daly et al. report "OH and H 2O" apparently formed by implantation of solar wind hydrogen. The ...
The earliest example of this work is using oxygen isotopes from the calcium carbonate (CaCO3) in belemnites to reconstruct ... Foraminifera are widely used for paleoclimatic and paleoceanographic research because of the oxygen isotopes in their calcium ... Oxygen isotopes, or δ18O, are used to interpret past temperature and ice volume. Foraminifera also incorporate trace amounts of ... Diatoms can also be used to study oxygen isotopes and are especially useful in regions of the ocean where foraminifera do not ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Flerov, G. N. (1967). "On the nuclear properties of the isotopes 256103 and 257103". Nucl. Phys. A. 106 (2): 476. Bibcode: ... The first atoms of lawrencium were produced by bombarding a three-milligram target consisting of three isotopes of the element ... The fourth element, either actinium or lawrencium, has only radioactive isotopes. Actinium, which occurs only in trace amounts ...
Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine ... Iso-tope Abun-dance Hauf-life (t1/2) Decay mode Pro-duct ...
... amount of calcium) is determined and given a number (a T-score). It is not used for bone imaging, as the image quality is not ... Applied Radiation and Isotopes. 50 (1): 125-36. doi:10.1016/S0969-8043(98)00044-X. PMID 10028632.. ... like calcium-rich bones). The discipline involving the study of anatomy through the use of radiographic images is known as ... between soft and hard body parts stems mostly from the fact that carbon has a very low X-ray cross section compared to calcium ...
Special Theme: Case Studies of Neodymium Isotopes in Paleoceanography. 29 (19-20): 2591-2603. Bibcode:2010QSRv...29.2591C. doi: ... Marine organisms which possess calcium carbonate shells or exoskeletons experience physiological pressure as the carbonate ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Primordial isotopes of the alkali metals Z. Alkali metal. Stable. Decays. unstable: italics. odd-odd isotopes coloured pink ... No primordial isotopes. (223. Fr. is a radiogenic nuclide) Radioactive: 40K, t1/2 1.25 × 109 years; 87Rb, t1/2 4.9 × 1010 years ... Francium-223, the only naturally occurring isotope of francium,[58][59] is the product of the alpha decay of actinium-227 and ...
Researchers in the field do not agree on a theory for cold fusion.[126] One proposal considers that hydrogen and its isotopes ... Several medium and heavy elements like calcium, titanium, chromium, manganese, iron, cobalt, copper and zinc have been reported ... This creates a high partial pressure, reducing the average separation of hydrogen isotopes. However, the reduction in ... the possible existence of fusion involving hydrogen isotopes in a planetary core.[24] In his original paper on this subject ...
Isotope geochemistry. References[edit]. *^ "USGS -- Isotope Tracers -- Resources -- Isotope Geochemistry". Retrieved 2009-01-18 ... Foraminifera shells are composed of calcium carbonate (CaCO3) and are found in many common geological environments. The ratio ... In geochemistry, paleoclimatology and paleoceanography δ18O or delta-O-18 is a measure of the ratio of stable isotopes oxygen- ... As the observed isotope variations are similar in shape to the temperature variations recorded for the past 420 ky at Vostok ...
Main isotopes of gadolinium. [[Isotope,IsoÀdàkọ:Shytope]] [[Natural abundance,AbunÀdàkọ:Shydance]] Half-life (t1/2) Decay mode ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ...
Soddy first used the word "isotope" in: Soddy, Frederick (4 December 1913). "Intra-atomic charge". Nature. 92 (2301): 399-400. ... Here, Döbereiner found that strontium's properties were intermediate to those of calcium and barium. ... They became known as isotopes, from the Greek eisos topos ("same place").[11][27] ...
Earliest evidence for life based on unusually high amounts of light isotopes of carbon, a common sign of life. 4280[36]. ... calcium carbonate deposited by the shells of marine invertebrates) found in Western Europe. ...
... indicates the mass number of the longest-lived isotope of the element. However, three elements, thorium, protactinium, and ... Calcium. Latin calx. 20. &040.078440.078(4)[২]. 2. 4 Cd. Cadmium. Greek kadmia. 48. &112.4118112.411(8)[২]. 12. 5 ...
Berkeley National Laboratory, The Isotopes Project. Hentet 21. april 2008.. *^ File:Binding energy curve - common isotopes.svg ... Garrett, Donald (2004) Handbook of Lithium and Natural Calcium, Academic Press, cited in The Trouble with Lithium 2, Meridian ... Garrett, Donald E (5. april 2004). Handbook of Lithium and Natural Calcium Chloride. s. 99. ISBN 9780080472904.. ... Garrett, Donald E. (2004-04-05) (på en). Handbook of Lithium and Natural Calcium Chloride. Academic Press. s. 200. ISBN ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... with half-life of the most stable isotope, dubnium-268, being only 29 hours, and other isotopes even more radioactive. To date ... Instead, vanadium is produced by heating vanadium oxide with calcium in a pressure vessel. Very high-purity vanadium is ...
Maslin, Mark A.; Swann, George E.A. (2006). "Isotopes in marine sediments". In Leng, Melanie J. Isotopes in Palaeoenvironmental ... For example, rivers that pass over limestone, which is mostly composed of calcium carbonate, will acquire carbonate ions. ... The differential uptake of the three carbon isotopes leads to 13. C/12. C and 14. C/12. C ratios in plants that differ from the ... C is proportional to the difference in the atomic masses of the two isotopes, so once the δ13C value is known, the depletion ...
IsotopesEdit. Main article: Isotopes of ytterbium. Natural ytterbium is composed of seven stable isotopes: 168Yb, 170Yb, 171Yb ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... The 169Yb isotope (with a half-life of 32 days), which is created along with the short-lived 175Yb isotope (half-life 4.2 days ... The primary decay mode of ytterbium isotopes lighter than the most abundant stable isotope, 174Yb, is electron capture, and the ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Iso-tope Abun-dance Half-life (t1/2) Decay mode Pro-duct ... such as calcium and magnesium. If barium replaces these ...
Calcium 1808 H. Davy 1808 H. Davy Davy discovered the metal by electrolysis of quicklime.[76] ... The two obtained the first isotope of this element that had been predicted by Mendeleev in 1871 as a member of the natural ... Prepared by bombardment of plutonium with calcium[160] 116 Livermorium 2000 Y. Oganessian et al. (JINR in Dubna) Prepared by ... Prepared by bombardment of californium with calcium[162] 115 Moscovium 2003 Y. Oganessian et al. (JINR in Dubna) Prepared by ...
This metastable isotope has a half-life of 6 hours, so batches of radiotracer must be prepared as needed using a moly cow. A ...
... cadmium Calamine Calcite Calcium Calcium carbonate Calcium oxide Californium calomel Calorimeter Canfieldite Carbohydrate ... oxide Irving Langmuir isocyanate Isomer isoprene isotope Isotope table (complete) Isotope table (divided) Israel Shahak IUPAC J ... Solvent solvation solvent species Specific heat capacity Spectroscopy Speed of sound Sperrylite Spinel Spodumene stable isotope ...
The resulting acidification of the oceans would kill many organisms that grow shells of calcium carbonate. At Brazos section, ... The team analyzed combined extinction patterns using a new clumped isotope temperature record from a hiatus-free, expanded K-Pg ... represents one of the most dramatic turnovers in the fossil record for various calcareous nanoplankton that formed the calcium ...
isotopes Argon 18. Ar. 39.948(1) isotopes 4 Potassium 19. K 39.0983(1) isotopes Calcium 20. Ca. 40.078(4) isotopes Scandium 21 ... isotopes 2 Lithium 3. Li. 6.941(2) isotopes Beryllium 4. Be. 9.012182(3) isotopes Boron 5. B 10.811(7) isotopes Carbon 6. C ... isotopes Radon 86. Rn. [222] isotopes 7 Francium 87. Fr. [223] isotopes Radium 88. Ra. [226] isotopes Actinium 89. Ac. [227] ... isotopes Nitrogen 7. N 14.0067(2) isotopes Oxygen 8. O 15.9994(3) isotopes Fluorine 9. F 18.9984032(5) isotopes Neon 10. Ne. ...
IsotopesEdit. Main article: Isotopes of germanium. Germanium occurs in 5 natural isotopes: 70. Ge. , 72. Ge. , 73. Ge. , 74. Ge ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... isotopes also exhibit minor β−. delayed neutron emission decay paths.[46]. OccurrenceEdit. See also: Category:Germanium ... Iso-tope Abun-dance Half-life (t1/2) Decay mode Pro-duct ... is the most common isotope, having a natural abundance of ...
Alpharadin uses bone targeted Radium-223 isotopes to kill cancer cells by alpha radiation.[183][unreliable medical source?] It ... High calcium intake has been linked to advanced prostate cancer.[86] Consuming fish may lower prostate cancer deaths but does ... "Calcium and vitamin D supplementation during androgen deprivation therapy for prostate cancer: a critical review". The ...
Evaluating the Use of Stable Isotope Models". Biotropica. 33 (3): 520-528. doi:10.1111/j.1744-7429.2001.tb00206.x.. ... owing to their flattened cross-section and to low levels of calcium near their tips. The elongation of bat digits, a key ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... The number of neutrons varies according to the isotope: the stable isotopes have 8, 9, or 10 neutrons. Oxygen is a member of ... "Oxygen Nuclides / Isotopes". EnvironmentalChemistry.com. Retrieved December 17, 2007.. *^ a b c Meyer, B. S. (September 19-21, ... see oxygen isotope ratio cycle). Seawater molecules that contain the lighter isotope, oxygen-16, evaporate at a slightly faster ...
Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... The longest-lived isotope of promethium has a half-life of 17.7 years, so the element exists in nature in only negligible ... Osamu Shimizu, a director of Asian Rare Earth, said "the company might have sold a few bags of calcium phosphate fertilizer on ... Rare-earth elements are also useful for dating rocks, as some radioactive isotopes display long half-lives. Of particular ...
Isotopes[edit]. Main article: Isotopes of bismuth. The only primordial isotope of bismuth, bismuth-209, was traditionally ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Iso-tope Abun-dance Half-life (t1/2) Decay mode Pro-duct ... Several isotopes of bismuth with short half-lives occur within ... This isotope has also been tried in cancer treatment, for example, in the targeted alpha therapy (TAT) program.[39][40] ...
The equation governing the decay of a radioactive isotope is:[5]. N. =. N. 0. e. −. λ. t. {\displaystyle N=N_{0}e^{-\lambda t ... Shells from both marine and land organisms consist almost entirely of calcium carbonate, either as aragonite or as calcite, or ... Maslin, Mark A.; Swann, George E.A. (2006). "Isotopes in marine sediments". In Leng, Melanie J. Isotopes in Palaeoenvironmental ... C isotopes are measured, and the resulting 13. C/12. C ratio is then compared to a standard ratio known as PDB.[note 9] The 13 ...
Alternatively, it is prepared from the reaction of dimethyl sulfate with potassium iodide in the presence of calcium carbonate: ... ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES, 2014, volume 50, pages 94-102, DOI: 10.1080/10256016.2013.828717 ...
Although calcium flowing into cells is normal, the uncontrolled increase of calcium causes the cells to degenerate. Because the ... indicating incorporation of the carbon isotopes. This enrichment was consistent with two biosynthetic pathways. The labeling ... It damages the neurons by activating AMPA and kainate receptors, causing an influx of calcium. ...
National Isotope Development Center Official website Calcium isotopes data from The Berkeley Laboratory Isotopes Projects. ... 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 ...
The radii of three proton-rich calcium isotopes are smaller than previously predicted because models didnt account for two ... Facility for Rare Isotope Beams. Charge radii of calcium isotopes. Scientists obtained new data from a laser spectroscopy ...
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, ...
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 ...
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. ...
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- ...
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 ...
2005): Calcium isotope (d44/40Ca) variations of Neogene planktonic foraminifera. Paleoceanography, 20(2), PA2013, https://doi. ... Calcium isotopes of planktonic foraminifera. PANGAEA, https://doi.org/10.1594/PANGAEA.837160, Supplement to: Heuser, A et al. ( ... Applying a coupled calcium/carbon cycle model, we find two scenarios that can explain a large portion of the observed d44/ ... 2005): Calcium isotope (d44/40Ca) variations of Neogene planktonic foraminifera. Paleoceanography, 20(2), PA2013, https://doi. ...
Gussone, N. , Nehrke, G. and Teichert, B. M. A. (2011): Calcium isotope fractionation in ikaite and vaterite , Chemical Geology ...
... 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 ...
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. ...
Reconstruction of both salinity and temperature from oxygen isotope of biogenic calcium carbonate. Research Project ... Journal Article] Discrimination of wild and cultured Japanese eels based on otolith stable isotope ratios2018. *. Author(s). ... Analysis of biogenic calcium carbonate such as bivalve shell and coral skeleton enable to reconstuct past environments . ... Journal Article] Temperature and depth distribution of Japanese eel eggs estimated using otolith oxygen stable isotopes2018. * ...
Isotopes. Main article: Isotopes of calcium. Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and ... Calcium isotope fractionation during mineral formation has led to several applications of calcium isotopes. In particular, the ... By far the most common isotope of calcium in nature is 40Ca, which makes up 96.941% of all natural calcium. It is produced in ... Mass-dependent differences in calcium isotope composition are conventionally expressed by the ratio of two isotopes (usually 44 ...
... ions and isotopes is the number of subatomic particles. An atom is the basic building block of matter, the smallest molecule of ... What are the chemical and physical properties of calcium?. * Q: What is H2O in chemistry?. ... When the number of neutrons in an atom changes, an isotope is formed. Isotopes of an atom have different atomic masses and ... The difference between atoms, ions and isotopes is the number of subatomic particles. An atom is the basic building block of ...
Isotopes. Calcium has four stable isotopes: 40Ca, 42Ca, 43Ca, and 44Ca. Of these, 40Ca is the most abundant isotope, ... Calcium citrate is 21 percent elemental calcium, which means that 1,000 mg will provide 210 mg of calcium. It is more expensive ... Calcium phosphate costs more than calcium carbonate, but less than calcium citrate. It is easily absorbed and is less likely to ... Calcium carbonate is 40 percent elemental calcium, which means that 1,000 mg will provide 400 mg of calcium. Taking this ...
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 ...
Isotopes. Main article: Isotopes of calcium. Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and ... Calcium 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.[5] The intestine absorbs ... By far the most common isotope of calcium in nature is 40Ca, which makes up 96.941% of all natural calcium. It is produced in ...
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 ...
The Chromium Isotope System as a Tracer of Ocean and Atmosphere Redox. Pris. 203,-. ... Application of Thallium Isotopes : Tracking Marine Oxygenation through Manganese Oxide Burial. Pris. 311,-. ... Barium Isotopes : Drivers, Dependencies, and Distributions through Space and Time. Pris. 203,-. ...
mimics calcium in body. bones, teeth (30 years). leukemia. Plutonium. Various. Up to 83 million years. inhaled; P-241 decays to ... Radiation By The Numbers: Isotopes To Watch : Shots - Health News The material used to produce nuclear power and its byproducts ... Isotope(s). Half Life. Properties. Accumulates (bHL). Associated with. Iodine. 131. 8 days. dissolves in water. thyroid (~100 ... Heres a summary of some of the radioactive isotopes to watch for. ...
Radioactive isotopes and enriched stable isotopes are used widely in medicine, agriculture, industry, and... ... Calcium-47 • In studies of cell function and bone formation of mammals and to produce Scandium-47 ... However, isotope programs have always depended on the "parasitic" use of reactors, whose primary use was not related to isotope ... Radioactive isotopes and enriched stable isotopes are used widely in medicine, agriculture, industry, and science, where their ...
Isotopes, Analyse isotopique, Analyses isotopiques (fr); آئسوٹوپ (pnb); ізатопы (be-tarask); Isotope, Isotopes, ہم جاء, ہم جا ( ... chemical isotope, atomic isotope, isotopes (en); Isotop, Izotopy (cs); Izotopi (bs); Isotopi (it); সমস্থানিক (bn); Signature ... Isotopes of calcium‎ (6 D). *. ► Isotopes of carbon‎ (1 K, 10 D) ... Isotope (so); Isotopo (war); आइसोटोप (new); izotop (sl); isotope (tl); Izotopi (sq); Изотоптор (ky); Isotop (ceb); izotopy (pl ...
This chapter summarizes the current knowledge on the Ca isotope composition of different tissues and Ca isotope cycling in the ... Heuser A. (2016) Biomedical Application of Ca Stable Isotopes. In: Calcium Stable Isotope Geochemistry. Advances in Isotope ... Skulan JL, DePaolo DJ (1999) Calcium isotope fractionation between soft and mineralized tissues as a monitor of calcium use in ... A pilot study on the use of natural calcium isotope (44Ca/40Ca) fractionation in urine as a proxy for the human body calcium ...
11.6 Isotopes of Boron and Lithium 383. 11.7 Isotopes of Magnesium and Calcium 392 ... 6.7 U-Series Isotopes and Melt Generation 193. Chapter 7: Radiogenic isotope geochemistry of the continental crust and the ... Chapter 10: Stable isotope geochemistry III: Low temperature applications 316. 10.1 Stable Isotopes in Paleontology, Archeology ... Attention then turns to stable isotopes and after reviewing the basic principles involved, the book explores their use in ...
Each variation is an isotope.. Five radioactive isotopes of oxygen are known also. A radioactive isotope is one that breaks ... Calcium oxide, or lime or quicklime (CaO), is an example. Carbonates are compounds that contain oxygen, carbon, and at least ... Isotopes are two or more forms of an element. Isotopes differ from each other according to their mass number. The number ... Although eight isotopes of oxygen are known, atmospheric oxygen is a mixture of the three isotopes with mass numbers 16, 17, ...
Climate reconstructions using calcium and barium isotopes in annually banded. Supervisors : Elias Samankassou ...
... on WN Network delivers the latest Videos and Editable pages for News & Events, including Entertainment, Music, ... Isotopes of calcium. Calcium (Ca) has 24 isotopes, from 34Ca to 57Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca ... Calcium. Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth- ... Calcium. Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth- ...
Calcium carbide. Silicon carbide. Carbides except calcium and silicon. Hydrides, nitrides, azides, silicides and borides. ... Calcium hydrogen-orthophosphate. Calcium phosphates except hydrogen-orthophosphate. Phosphates of metals nes. Sodium ... Calcium chloride. Magnesium chloride. Aluminium chloride. Iron chlorides. Cobalt chloride. Nickel chloride. Zinc chloride. Tin ... Calcium carbonate. Barium carbonate. Lead carbonate. Lithium carbonates. Strontium carbonate. Bismuth carbonate. Carbonates of ...
Well, strontium has a molecular structure similar to calcium. Calcium, as you know, is a major component of the mineral of both ... isotope value of a region is is important to consider. Archaeologists have characterized the strontium isotope value of an area ... Perhaps the strontium isotope values of your bones and teeth would reveal that you had moved from one part of the world to ... Mobility and Migration: Strontium Isotopes. To view this video please enable JavaScript, and consider upgrading to a web ...
  • The known sites of Ca isotope fractionation and the calcium isotopic composition of different compartments and body fluids are discussed. (springer.com)
  • Böhm F, Gussone N, Eisenhauer A et al (2006) Calcium isotope fractionation in modern scleractinian corals. (springer.com)
  • Gussone N, Langer G, Thoms S et al (2006) Cellular calcium pathways and isotope fractionation in Emiliania huxleyi. (springer.com)
  • Heuser A, Eisenhauer A (2010) A pilot study on the use of natural calcium isotope ( 44 Ca/ 40 Ca) fractionation in urine as a proxy for the human body calcium balance. (springer.com)
  • Heuser A, Eisenhauser A, Scholz-Ahrens KE et al (2016) Biological fractionation of stable Ca isotopes in göttingen minipigs as a physiological model for Ca homeostasis in humans. (springer.com)
  • 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)
  • Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present in some substances, such as polar ice or calcite in ocean core samples, measured with the isotope fractionation. (wikipedia.org)
  • δ18O Isotope fractionation Miller, Dana L. (wikipedia.org)
  • 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)
  • 3. Effects on carbon isotope fractionation. (springer.com)
  • 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)
  • Diffusive fractionation of volatiles and their isotopes during bubble growth in magmas Watson, E. 2017-07-07 00:00:00 Bubbles grow in decompressing magmas by simple expansion and by diffusive supply of volatiles to the bubble/melt interface. (deepdyve.com)
  • Isotopic fractionation of chlorine during chemical diffusion in a dacitic melt and its implications for isotope behavior during bubble growth (abstract), 2016 Fall AGU Meeting, 2016)], so there is a clear need to understand the efficacy of diffusive fractionation during bubble growth. (deepdyve.com)
  • For volatile species whose isotope mass effects on diffusion have been measured (Cl, Li), predicted isotope fractionation in the exsolved vapor can be as large as −4‰ for Cl and −25‰ for Li. (deepdyve.com)
  • 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)
  • 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)
  • Calcium 44 Carbonate (Calcium-44) is a stable (non-radioactive) isotope of Calcium. (americanelements.com)
  • 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)
  • Calcium Carbonate is also available in ultra high purity and as nanoparticles. (americanelements.com)
  • Calcium Carbonate 44 isotopic material is generally immediately available. (americanelements.com)
  • It frequently serves as an alloying agent for other metals like aluminum and beryllium industrial materials like cement and mortar are composed of calcium compounds like calcium carbonate . (americanelements.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)
  • 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)
  • Mean change in fractional absorption of calcium from amorphous calcium carbonate (ACC) Vs. crystalline calcium carbonate (CCC). (clinicaltrials.gov)
  • The first scenario increases the riverine calcium input to the ocean without a proportional increase of the carbonate flux. (pangaea.de)
  • Although oxygen isotopic ratio of biogenic calcium carbonate has been used as a powerful proxy for reconstruction of water temperature at the time of formation, the most important problem was that it can not separate the effect of salinity. (nii.ac.jp)
  • In this study, we focused on organic materials contained in a trace amount in the calcium carbonate skeleton, attempting to develop a method for separating the influence of salinity based on oxygen and carbon isotopic ratio. (nii.ac.jp)
  • In addition, pearls and eggshells are made of calcium carbonate. (newworldencyclopedia.org)
  • calcite Calcite is the most common form of natural calcium carbonate (CaCO 3 ). (britannica.com)
  • Calcium carbonate deposits dissolve in water that contains carbon dioxide to form calcium bicarbonate, Ca(HCO 3 ) 2 . (britannica.com)
  • Calcium is found in many other minerals, such as aragonite (a type of calcium carbonate) and gypsum (another form of calcium sulfate), and in many feldspars and zeolites . (britannica.com)
  • Calcite is a natural calcium carbonate. (britannica.com)
  • Analysis of calcium carbonate samples by Finnigan MAT253 mass spectrometer systems. (whoi.edu)
  • Below a certain pH and corresponding carbonate concentration, conditions become corrosive to calcium carbonate, which is used by many organisms to build shells and skeletons. (iaea.org)
  • Notable exceptions include calcium hydroxide , calcium sulfate (unusual for sulfate salts), calcium carbonate and tricalcium phosphate . (gutenberg.org)
  • Techniques using mass spectrometry and a double spike isotope dilution have been used for K-Ca age dating. (wikipedia.org)
  • Finally, we have begun exploring new technology to measure Ca isotope ratios using laser fluorescence rather than conventional mass spectrometry. (data.gov)
  • The advent of magnetic sector inductively coupled plasma-mass spectrometry (ICP-MS) allows rapid, accurate, and precise measurement of lead isotopes in environmental and biological samples at a lower cost than traditional methods. (thefreelibrary.com)
  • Solid samples (organic and inorganic) for oxygen isotope measurements are usually stored in silver cups and measured with pyrolysis and mass spectrometry. (wikipedia.org)
  • This study presents comprehensive strontium stable isotope ( 88 Sr/ 86 Sr) data, measured by multiple-collector inductively-coupled plasma mass spectrometry (MC-ICP-MS), for a suite of carbonaceous chondrites, differentiated meteorites, lunar, martian and terrestrial samples. (open.ac.uk)
  • isotope dilution mass spectrometry. (bio-medicine.org)
  • These methods, using mass spectrometry, can discern the relative ratios of the calcium isotopes 42Ca and 44Ca in bone. (medicalxpress.com)
  • The Encyclopedia of Mass Spectrometry: Elemental and Isotope Ratio Mass Spectrometry. (usda.gov)
  • Analysis of isotope ratios in biological samples is currently done almost exclusively using mass spectrometry. (usda.gov)
  • Albarède F (2015) Metal stable isotopes in the human body: a tribute of geochemistry to medicine. (springer.com)
  • This book provides a comprehensive introduction to radiogenic and stable isotope geochemistry. (wiley.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)
  • He uses techniques that span isotope geochemistry, next generation DNA sequencing, and satellite tagging to study the ecology of a wide variety of ocean species. (whoi.edu)
  • Stable isotope geochemistry has come into its own in the last few years as our inventory of processes and materials has improved from the result of much basic research. (geoscienceworld.org)
  • 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)
  • Isotopes of each element contain the same number of protons, but a different number of neutrons. (phys.org)
  • The heaviest isotope of an element represents the limit of how many neutrons the nucleus can hold. (phys.org)
  • The nucleus of calcium-60 has 20 protons and twice as many neutrons. (phys.org)
  • That's 12 more neutrons than the heaviest of the stable calcium isotopes, calcium-48. (phys.org)
  • 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)
  • In ions, the number of electrons differs, and in isotopes, the number of neutrons varies. (reference.com)
  • When the number of neutrons in an atom changes, an isotope is formed. (reference.com)
  • The number of neutrons determines what the isotope is. (nsf.gov)
  • The various isotopes of a given element differ from one another only in the number of neutrons in their atomic nucleus (the number of protons in the nucleus differentiates the elements from one another), and even highly purified samples of an element are generally a mixture of several isotopes. (nap.edu)
  • Isotopes are versions of the same element with different numbers of neutrons, meaning each isotope has a different atomic weight. (earthmagazine.org)
  • Calcium has 20 protons and 20 neutrons. (reference.com)
  • This means an atom with 20 protons and 20 neutrons must be an atom of calcium. (reference.com)
  • In some cases, calcium does not have 20 neutrons. (reference.com)
  • The element has several different isotopes, which are atoms of the same element that have different numbers of neutrons. (reference.com)
  • Isotopes (atoms of the same element with different numbers of neutrons). (nasa.gov)
  • It reacts with water, displacing hydrogen and forming calcium hydroxide , an alkaline substance. (newworldencyclopedia.org)
  • Calcium metal reacts with water , generating hydrogen gas at a rate rapid enough to be noticeable, but not fast enough at room temperature to generate much heat, making it useful for generating hydrogen. (wn.com)
  • Calcium, strontium, and barium react with water to produce hydrogen gas and their respective hydroxides , and also undergo transmetalation reactions to exchange ligands . (wikipedia.org)
  • It burns in air or pure oxygen to form the oxide and reacts rapidly with warm water (and more slowly with cold water) to produce hydrogen gas and calcium hydroxide. (britannica.com)
  • For example, H + means a hydrogen ion, and Ca 2+ a calcium ion (with two electrons missing). (citizendium.org)
  • Subsequent chapters cover nucleosynthetic anomalies in meteorites and early solar system chronology and the use of radiogenic isotopes in understanding the evolution of the Earth's mantle, crust, and oceans. (wiley.com)
  • Measuring the abundances of diverse trace elements and stable and radiogenic isotopes at micron scales. (whoi.edu)
  • We report a high resolution oxygen isotope (δ 18 O) record of animal teeth-bone phosphates from an archaeological trench itself at Bhirrana, NW India, preserving all cultural levels of this civilization. (nature.com)
  • Oxygen isotope analysis considers only the ratio of 18O to 16O present in a sample. (wikipedia.org)
  • In laboratories, the temperature, humidity, ventilation and so on affect the accuracy of oxygen isotope measurements. (wikipedia.org)
  • Measurements of the calcium isotopic composition (d44/40Ca) of planktonic foraminifera from the western equatorial Pacific and the Indian sector of the Southern Ocean show variations of about 0.6 per mil over the past 24 Myr. (pangaea.de)
  • 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)
  • The primary goal of this project was to demonstrate whether the relationship between bone mineral balance (BMB) and changes in the natural isotope composition of blood and urine observed in Earth-based bed rest studies could also be observed in crewmembers in spaceflight, providing the basis for inflight measurements of BMB and evaluation of effectiveness of bone loss countermeasures in individual crewmembers. (data.gov)
  • Although not all of our analyses are completed, analysis of archived urine samples from 32 crewmembers from previous ISS missions clearly shows the same pattern of change in Ca isotope composition observed in bed rest and predicted in spaceflight. (data.gov)
  • Changes in Ca isotope composition are revealing details of the dynamics of BMB on previously inaccessible timescales, and offer new insights into bone biology. (data.gov)
  • This chapter summarizes the current knowledge on the Ca isotope composition of different tissues and Ca isotope cycling in the human and vertebrate body. (springer.com)
  • Gordon GW, Monge J, Channon MB et al (2014) Predicting multiple myeloma disease activity by analyzing natural calcium isotopic composition. (springer.com)
  • In the last two decades the use of enriched stable isotopes has offered substantial advantages to scientists and clinicians involved in the rapid growth of research on human body composition, energy balance, protein turnover, and fuel utilization (Whitehead and Prentice, 1991). (nap.edu)
  • Porous calcium phosphate implant compositions that approximate the chemical composition of natural bone mineral are provided. (google.es)
  • 1 . A self-setting, porous calcium phosphate composition comprising a calcium phosphate, an effervescent agent, and a biocompatible cohesiveness agent admixed with a physiologically acceptable fluid, wherein release of a gaseous component of said effervescent agent occurs upon hydration of said composition and produces at least 5% porosity in said composition, and wherein, after hardening, said calcium phosphate composition has a compressive strength of 1 MPa or greater. (google.es)
  • 3 . The composition of claim 1 , wherein said calcium phosphate is prepared using an amorphous calcium phosphate and a second calcium phosphate source. (google.es)
  • 5 . The composition of claim 1 , wherein said calcium phosphate has an average crystalline domain size of less than 100 nm. (google.es)
  • Stable calcium isotopic composition of meteorites and rocky planets. (open.ac.uk)
  • Applying a coupled calcium/carbon cycle model, we find two scenarios that can explain a large portion of the observed d44/40Casw variations. (pangaea.de)
  • 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)
  • Responsible for these fluctuations in oxygenation were likely driven by the Lomagundi carbon isotope excursion. (wikipedia.org)
  • The isotope ratio in the calcite is therefore the same, after compensation, as the ratio in the water from which the microorganisms of a given layer extracted the material of the shell. (wikipedia.org)
  • In contrast, the magnesium/Calcium (Mg/Ca) ratio of a coral skeleton reflects SST independent of Salinity. (upenn.edu)
  • Noble gas abundance and isotope ratio measurements for seawater and fresh waters, rocks, and other materials. (whoi.edu)
  • Trace metal and isotope ratio measurements. (whoi.edu)
  • D H/D L = diffusivity ratio of the heavy and light isotopes). (deepdyve.com)
  • 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)
  • Calcium is a chemical element with symbol Ca and atomic number 20. (wikipedia.org)
  • Isotopes of an atom have different atomic masses and exhibit different properties, but they are still the same element. (reference.com)
  • Calcium (chemical symbol Ca , atomic number 20) is the fifth most plentiful chemical element in the Earth 's crust, occurring in various rocks, minerals, coral, and shells of marine animals. (newworldencyclopedia.org)
  • Historically, isotopes were provided to researchers by the Atomic Energy Commission and the Energy Research and Development Agency and are now provided by the U.S. Department of Energy (DOE). (nap.edu)
  • Won't Aid Russia In response to questions, he said he knows of no way that Russia would be helped in the atomic en- igy race if the Soviets should get ^ld of some of the istopes. (newspapers.com)
  • This video explains atomic mass, relative atomic mass and isotopes. (topperlearning.com)
  • 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)
  • Oxygen (chemical symbol O) has three naturally occurring isotopes: 16O, 17O, and 18O, where the 16, 17 and 18 refer to the atomic mass. (wikipedia.org)
  • when we say, the atomic weight of, for instance, calcium is 40, we really express the fact that, while the majority of calcium atoms have an actual atomic weight of 40, there are not but a few which are represented by 39 or 41, a less number by 38 or 42, and so on. (todayinsci.com)
  • Calcium has an atomic number of 20, so it has 20 protons. (reference.com)
  • In atom physics, isotopes of an element are distinguished by adding the atomic mass as a superscript (usually, but not always, attached to the left of the symbol). (citizendium.org)
  • It is the relatively high-atomic-number calcium in the skeleton that causes bone to be radio-opaque. (gutenberg.org)
  • 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)
  • The radii of three proton-rich calcium isotopes are smaller than previously predicted because models didn't account for two nuclear interactions. (energy.gov)
  • and calcium phosphate in the apatite group of minerals. (newworldencyclopedia.org)
  • Calcium is a very important element to human physiology , as calcium- phosphate salts form the basis for the creation of bones . (conservapedia.com)
  • In addition to calcium phosphate, the compositions include an effervescent agent to promote the formation of interconnected pores and a cohesiveness agent to maintain the shape. (google.es)
  • When introduced at an implant site, the calcium phosphate compositions are remodeled into bone. (google.es)
  • Methods for using the calcium phosphate compositions, e.g., to repair or replace bone, are also provided. (google.es)
  • Calcium phosphate-based transfection methods are frequently used to transfer DNA into living cells. (nih.gov)
  • Upon subsequent resolution of the calcium phosphate, intracellular free ionic calcium-surges could result, inducing as side effect various physiological responses that may finally result in cell death. (nih.gov)
  • Here we investigated the overall calcium uptake by the human bladder carcinoma cell line T24 during the standard calcium phosphate transfection method and also during transfection with custom-made calcium phosphate/DNA nanoparticles by isotope labelling with (45)calcium. (nih.gov)
  • 45)Calcium uptake was strongly increased after 7h of standard calcium phosphate transfection but not if the transfection was performed with calcium phosphate nanoparticles. (nih.gov)
  • Time lapse imaging microscopy using the calcium-sensitive dye Fura-2 revealed large transient increases of the intracellular free calcium level during the standard calcium phosphate transfection but not if calcium phosphate nanoparticles were used. (nih.gov)
  • Consistently, the viability of cells transfected by calcium phosphate/DNA nanoparticles was not changed, in remarkable contrast to the standard method where considerable cell death occurred. (nih.gov)
  • As calcium hydroxyl phosphate , it is the principal inorganic constituent of teeth and bones and occurs as the mineral apatite . (britannica.com)
  • Between 50 percent and 60 percent of body magnesium is located within bone, where it is thought to form a surface constituent of the hydroxyapatite (calcium phosphate) mineral component. (fao.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)
  • Calcium is the most abundant metal and the fifth-most abundant element in the human body . (wikipedia.org)
  • 40 Ca, 42 Ca, 43 Ca, and 44 Ca. Of these, 40 Ca is the most abundant isotope, constituting 97 percent of naturally occurring calcium. (newworldencyclopedia.org)
  • Calcium is a soft gray alkaline earth metal , fifth-most-abundant element by mass in the Earth 's crust . (wn.com)
  • As a major material used in mineralization of bone , teeth and shells , calcium is the most abundant metal by mass in many animals . (wn.com)
  • Iron is mostly iron-56 (92 percent), but it contains small amounts of three other isotopes as well, and tin is a mixture of 10 stable isotopes, the most abundant of which makes up only 33 percent of the total. (nap.edu)
  • CELIAS has measured elements and isotopes that were not observable or not resolvable from more abundant species prior to SOHO. (nasa.gov)
  • Calcium is the fifth-most-abundant element by mass in the human body, where it is an important cellular ionic messenger with many functions. (gutenberg.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)
  • Like the other elements placed in group 2 of the periodic table, calcium has two valence electrons in the outermost s-orbital, which are very easily lost in chemical reactions to form a dipositive ion with the stable electron configuration of a noble gas , in this case argon . (wikipedia.org)
  • What isotopes of Argon are present on Earth? (nasa.gov)
  • What is the primary isotope of Argon on Earth? (nasa.gov)
  • Although stable isotopes occur naturally, their utility can be greatly enhanced when they are isolated and enriched through processes such as electromagnetic separation, cryogenic distillation, thermal diffusion, or other physical and chemical processes. (nap.edu)
  • 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)
  • This was the breakthrough, which allowed the confirmation of the predictions for the exotic calcium isotopes of the Darmstadt theory group. (idw-online.de)
  • The use of enriched stable isotopes and their applications as they are presently known emerged from early work with metabolites labeled with deuterium (Schoenheimer and Rittenberg, 1935). (nap.edu)
  • These enriched stable isotopes are used as target materials in the preparation of radioisotopes with particle accelerators and nuclear reactors and as biological tracers in biomedical research and clinical applications. (nap.edu)
  • In many areas of research, the need for enriched stable isotopes is as vital as the need for pure chemicals (Friedlander and Wagner, 1982). (nap.edu)
  • Heuser A, Frings-Meuthen P, Rittweger J et al (2011b) Calcium isotopes in human urine under simulated microgravity conditions. (springer.com)
  • Over the next 24 hours, we will collect all urine for measurement of its calcium content. (clinicaltrials.gov)
  • Calcium isotope ratios in blood and urine: A new biomarker for the diagnosis of 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)
  • Low fractional calcium absorption (FCA) contributes to osteoporosis but is not measured clinically, as the gold-standard method requires administration of two calcium tracers and a subsequent 24-h urine collection. (biomedcentral.com)
  • We measured subsequent calcium isotope concentrations in 24-h urine samples and serum collected 1, 3 and 5 h post tracer administration during an inpatient research stay. (biomedcentral.com)
  • While more efficient, the single isotope method might be less accurate than the 24-h urine method. (biomedcentral.com)
  • Together, they have measured concentrations of calcium isotopes - specifically stable isotopes, which occur naturally and do not decay into other elements - in the urine of participants in a long-term bed-rest study run by NASA to mimic conditions seen in microgravity and study the effects on human anatomy. (earthmagazine.org)
  • Working with NASA, the researchers measured calcium isotope ratios in urine from 30 shuttle astronauts, before, during, and after the flights. (medicalxpress.com)
  • Calcium ions outside cells are important for maintaining the potential difference across excitable cell membranes as well as proper bone formation. (wikipedia.org)
  • 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)
  • Other reactor-produced radioisotopes continue to play a major role in research, and recent advances in many fields (such as molecular biology, including the Human Genome Project) could not have been accomplished without the use of 32 P. In addition, many of the isotopes useful for therapeutic applications, such as strontium-89 for the palliation of metastatic bone pain, are produced in reactors. (nap.edu)
  • Finally, current biomedical applications of Ca isotopes for the detection of bone loss during bed rest studies and during bone cancer are presented. (springer.com)
  • Channon MB, Gordon GW, Morgan JLL et al (2015) Using natural, stable calcium isotopes of human blood to detect and monitor changes in bone mineral balance. (springer.com)
  • Freeman SP, King JC, Vieira NE et al (1997) Human calcium metabolism including bone resorption measured with 41Ca tracer. (springer.com)
  • Calcium levels in mammals are tightly regulated, with bone acting as the major mineral storage site. (wn.com)
  • Calcium ions , Ca 2+ , are released from bone into the bloodstream under controlled conditions. (wn.com)
  • Calcitriol, the active form of vitamin D 3 , promotes absorption of calcium from the intestines and the mobilization of calcium ions from bone matrix. (wn.com)
  • Trabecular bone readily gives up its minerals whenever blood calcium needs replenishing. (bartleby.com)
  • 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)
  • In addition, the close correlation between Ca isotopes and biomarkers of bone demineralization suggest that early changes in bone demineralization are detected by Ca isotope values, long before radiological changes in BMD can manifest on DXA. (geomar.de)
  • Taking calcium internally can promote bone growth. (conservapedia.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)
  • 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)
  • The researchers found that lighter calcium isotopes, such as 42Ca, are absorbed from the blood into the bone during bone formation . (medicalxpress.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)
  • 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)
  • It is not clear whether this occurs because parathyroid hormone release is inhibited or, more probably, because of a reduced sensitivity of the bone to parathyroid hormone, thus restricting withdrawal of calcium from the skeletal matrix. (fao.org)
  • Calcium also serves as a structural element in bone. (gutenberg.org)
  • Charge radii of calcium isotopes. (newswise.com)
  • 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)
  • 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 extent and mechanisms of CO 2 fixation were evaluated across a comprehensive set of high-temperature, chemotrophic microbial communities in Yellowstone National Park by combining metagenomic and stable 13 C isotope analyses. (frontiersin.org)
  • Here, we present three household case studies to illustrate how lead hazard evaluations by an environmental specialist could be supplemented with routine lead isotope analyses of potential lead sources and blood. (thefreelibrary.com)
  • 2005): Calcium isotope (d44/40Ca) variations of Neogene planktonic foraminifera. (pangaea.de)
  • In both cases the calcium flux variations lead to drastic changes in the seawater Ca concentrations on million year timescales. (pangaea.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)
  • Bullen TD, Walczyk T (2009) Environmental and biomedical applications of natural metal stable isotope variations. (springer.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)
  • 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)
  • Calcium ( Ca ) has 24 isotopes, from 34 Ca to 57 Ca. There are five stable isotopes ( 40 Ca, 42 Ca, 43 Ca, 44 Ca and 46 Ca), plus one isotope ( 48 Ca ) with such a long half-life that for all practical purposes it can be considered stable. (wn.com)
  • As shown, calcium-39 is consistent with previous measurements. (newswise.com)
  • This may increase the feasibility of including lead isotope measurements as a routine tool to identify household sources of lead exposure to children. (thefreelibrary.com)
  • Sampling for lead isotopes was undertaken following the U.S. Department of Housing and Urban Development regulatory guidelines for the evaluation of lead hazards in housing, and with the consideration of minimizing the additional costs associated with lead isotope measurements. (thefreelibrary.com)
  • 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)
  • 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)
  • 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)
  • 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)
  • Obtain the fractional abundances for the two naturally occurring isotopes of europium. (bartleby.com)
  • The latter phenomenon is of significant geochemical interest because diffusion can fractionate elements and isotopes (or isotopologues) of dissolved components. (deepdyve.com)
  • 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)
  • In addition, calcium has a radioactive isotope, 41 Ca, with a half-life of 103,000 years. (newworldencyclopedia.org)
  • A gradual transition has occurred, now virtually complete, from radioactive isotope studies to those using stable isotopes. (usda.gov)
  • The purpose of this study is to measure the effect of omeprazole on intestinal calcium absorption in postmenopausal women. (clinicaltrials.gov)
  • Enriched refers to material that consists largely or exclusively of a single isotope and is usually obtained by one of the separation techniques described later in this chapter. (nap.edu)
  • Nonetheless, several researchers reported that single isotope methods correlate well with FCA. (biomedcentral.com)
  • Stable" isotopes live forever, while some heavy isotopes might only live for a few seconds. (phys.org)
  • Conversely, these light isotopes tend to be released into the bloodstream when bones break down. (medicalxpress.com)
  • how osteoarchaeologists can detect different isotopes. (coursera.org)
  • The study is comprised of 15 subjects orally administered immediately after breakfast a 600 mg gelatin capsules containing either 600 mg (2 capsules of 300 mg)of ACC (192 mg elemental calcium) of 480 mg CCC (192 mg elemental calcium), labeled with 15 mg of 44Ca (2 capsules of 300 mg). (clinicaltrials.gov)
  • 600 mg (2 capsules of 300 mg) for oral use of 480 mg CCC (192 mg elemental calcium) intrinsically labeled with 15 mg 44Ca and 120 mg of inactive filler, sucrose. (clinicaltrials.gov)
  • Subsequent methods of extraction have included electrolysis of calcium fluoride or calcium chloride. (newworldencyclopedia.org)
  • It is a silvery metallic element that must be extracted by electrolysis from a fused salt like calcium chloride . (wn.com)
  • Formerly produced by electrolysis of anhydrous calcium chloride, pure calcium metal is now made commercially by heating lime with aluminum. (britannica.com)
  • Calcium is a silvery white metal which is obtained by the electrolysis of molten calcium chloride. (goodfellow.com)
  • for example, calcium chloride is used extensively to dry gases as it is capable of absorbing moisture from the atmosphere. (goodfellow.com)
  • Europium isotopes are good neutron absorbers and are being studied for use in nuclear control applications. (lanl.gov)
  • In its elemental form, calcium has a dull gray-silver appearance. (americanelements.com)
  • In nature, calcium (Latin calcis , meaning "lime") is not found in its elemental state. (newworldencyclopedia.org)
  • 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)
  • 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)
  • 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)
  • Calcium is a very ductile silvery metal (sometimes described as pale yellow) whose properties are very similar to the heavier elements in its group, strontium , barium , and radium . (wikipedia.org)
  • 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)
  • Calcium is one of the primary elements in bones, shells, etc. (conservapedia.com)
  • Calcium isotopes are also used to study calcification rates (for the creation of shells and skeletons) and other processes. (iaea.org)
  • The stacked d44/40Ca record of Globigerinoides trilobus and Globigerina bulloides indicates a minimum in d44/40Casw (seawater calcium) at 15 to 16 Ma and a subsequent general increase toward the present, interrupted by a second minimum at 3 to 5 Ma. (pangaea.de)
  • Heuser A, Tütken T, Gussone N et al (2011a) Calcium isotopes in fossil bones and teeth-diagenetic versus biogenic origin. (springer.com)
  • We can answer these questions by looking at the shape of longbones, and by studying the isotopes and the DNA that can be found in human bones. (coursera.org)
  • People who are overweight or obese are vulnerable to losing unhealthful amounts of calcium from their bones when they go on weight-loss diets. (usda.gov)
  • But a study by Agricultural Research Service ( ARS ) scientists suggests that consuming about three times the recommended amount of dietary copper may help women retain calcium in their bones when dieting. (usda.gov)
  • The study showed that the women who were given 3 mg of additional copper were more likely to retain calcium in their bones. (usda.gov)
  • and calcium hydroxide is used for processing water for beverages and neutralizing acids in the tanning industry. (newworldencyclopedia.org)
  • 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)
  • To synthesize these new isotopes, researchers accelerated an intense beam of heavy zinc particles onto a block of beryllium. (phys.org)
  • A team of researchers from has provided evidence for a new nuclear magic number in the unstable, radioactive calcium isotope 54C a. (science20.com)
  • aims to bring together leading academic scientists, researchers and research scholars to exchange and share their experiences and research results on all aspects of Calcium and Notable Characteristics in Nutrition Science. (waset.org)
  • During the study, the researchers tracked the participants loss of calcium with isotopes. (usda.gov)
  • gypsum , anhydrite , fluorite , and apatite are also sources of calcium. (wikipedia.org)
  • Mineral samples taken from the Whiterock Pluton, and surrounding country rock, were analyzed for oxygen isotopes to determine the source of altering fluid. (beloit.edu)
  • When in solution, the calcium ion varies remarkably to the human taste, being reported as mildly salty, sour, "mineral-like" or even "soothing. (gutenberg.org)
  • It is apparent that many animals can taste, or develop a taste, for calcium, and use this sense to detect the mineral in salt licks or other sources. (gutenberg.org)
  • Of the human body's solid components after drying and burning of organics (as for example, after cremation ), about a third of the total "mineral" mass remaining is the approximately one kilogram of calcium that composes the average skeleton (the remainder being mostly phosphorus and oxygen). (gutenberg.org)
  • The use of stable isotopes in mineral nutrition research has become a fundamental aspect of conducting this research. (usda.gov)
  • Although primarily used in human research, mineral stable isotopes - principally calcium, magnesium, iron, and zinc are increasingly being utilized in animal and even cell research. (usda.gov)
  • These isotopes are used to assess mineral absorption, evaluate rates of turnover and excretion of minerals, and assess the effects on mineral homeostatis of disease processes and dietary manipulations. (usda.gov)
  • The methodological issues in using a single-collector high-resolution magnetic sector field ICP-MS for mineral stable isotope analysis from biological samples will be considered. (usda.gov)
  • An alkaline earth metal , calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. (wikipedia.org)
  • Pure calcium was isolated in 1808 via electrolysis of its oxide by Humphry Davy , who named the element. (wikipedia.org)
  • The ancient Romans are known to have prepared lime (calcium oxide) as early as the first century. (newworldencyclopedia.org)
  • The element calcium, however, was not isolated until 1808 in England , when Sir Humphry Davy electrolyzed a mixture of lime and mercuric oxide. (newworldencyclopedia.org)
  • Once produced, it rapidly forms a gray-white coating of calcium oxide and calcium nitride for reacting with the oxygen and nitrogen in the air when exposed to it. (wn.com)
  • One calcium compound , lime (calcium oxide, CaO) was extensively used by the ancients. (britannica.com)
  • Calcium oxide (lime), produced by heating limestone, has many applications including the chemical, agricultural, construction and water industries. (goodfellow.com)
  • The calcium atom has a radius of 197 pm and a Van der Waals radius of 231 pm. (americanelements.com)
  • A calcium atom has twenty electrons, arranged in the electron configuration [Ar]4s 2 . (wikipedia.org)
  • A very standard example is in medicine where you have certain isotopes that emit an anti electron called a positron, and where the decay that takes place can be localized by something called positron emission tomography, or PET. (nsf.gov)
  • they exist as nearly 270 stable isotopes-that is, forms of the elements that do not decay or emit radiation-and hundreds of radioactive isotopes. (nap.edu)
  • 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)
  • As a member of the series of alkaline earth metals, calcium lies in group 2 (former group 2A) of the periodic table , between magnesium and strontium . (newworldencyclopedia.org)
  • Calcium (Ca) , chemical element , one of the alkaline-earth metals of Group 2 (IIa) of the periodic table . (britannica.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)
  • Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. (wikipedia.org)
  • Unlike cosmogenic isotopes that are produced in the atmosphere, 41Ca is produced by neutron activation of 40Ca. (wikipedia.org)
  • It is described as a "cosmogenic" isotope, which means that it is produced by the action of high-energy cosmic rays on the nuclei of target atoms. (newworldencyclopedia.org)
  • Calcium also has a cosmogenic isotope , radioactive 41 Ca, which has a half-life of 102,000 years. (wn.com)
  • Unlike cosmogenic isotopes that are produced in the atmosphere , 41 Ca is produced by neutron activation of 40 Ca. Most of its production is in the upper metre or so of the soil column, where the cosmogenic neutron flux is still sufficiently strong. (wn.com)
  • Women will present to the research unit in the early morning and receive an oral and intravenous calcium tracer with breakfast. (clinicaltrials.gov)
  • Peak plasma tracer levels can be influenced by intestinal calcium excretion and transit time, renal calcium recycling and volume of calcium distribution. (biomedcentral.com)
  • 12 ] assessed spot serum isotope levels at multiple time points within 24 h of tracer administration and concluded, by Bland-Altman analysis, that spot serum levels were inaccurate and introduced up to 69 % error in estimates of FCA. (biomedcentral.com)
  • As calcium fluoride, it occurs as fluorite , or fluorspar. (britannica.com)
  • The metal can be prepared by the reduction of the anhydrous fluoride with metallic calcium . (lanl.gov)