Calcium Isotopes
Effects of high compared with low calcium intake on calcium absorption and incorporation of iron by red blood cells in small children. (1/181)
BACKGROUND: The potential benefits of increasing calcium intake in small children must be balanced with the potential risk to iron utilization from high calcium intakes. OBJECTIVE: This study was designed to evaluate the relation between calcium intake and calcium absorption and iron incorporation into red blood cells. DESIGN: We performed a multitracer, crossover study of the absorption of calcium and red blood cell incorporation of iron in 11 preschool children aged 3-5 y who had been adapted for 5 wk to low- (502 +/- 99 mg) and high- (1180 +/- 117 mg) calcium diets. Stable-isotope studies were performed by using 44Ca and 58Fe given orally with meals and 46Ca given intravenously. RESULTS: Iron incorporation into red blood cells 14 d postdosing was similar (6.9 +/- 4.2% compared with 7.9 +/- 5.5%; NS) with the low- and high-calcium diets, respectively. Total calcium absorption (181 +/- 50 compared with 277 +/- 91 mg/d; P = 0.002) was greater in children with the higher calcium intake. CONCLUSIONS: Our findings indicate that small children may benefit from calcium intakes similar to those recommended for older children without adverse effects on dietary iron utilization. (+info)Characterization of prostanoid receptors in podocytes. (2/181)
Prostaglandins participate in the regulation of important glomerular functions and are involved in the pathogenesis of glomerular diseases. This study investigates the influence of prostaglandins on membrane voltage, ion conductances, cAMP accumulation, and cytosolic calcium activity ([Ca2+]i) in differentiated podocytes. Prostaglandin E2 (PGE2) caused a concentration-dependent depolarization and an increase of the whole cell conductance in podocytes (EC50 approximately 50 nM). Compared with PGE2, the EP2/EP3/EP4 receptor agonist 11-deoxy-PGE1 caused an equipotent depolarization, whereas the DP receptor agonist BW 245 C, the EP1/EP3 receptor agonist sulprostone, and the IP receptor agonist iloprost were at least 100 to 1000 times less potent than PGE2. The EP2 receptor agonist butaprost did not change membrane voltage of podocytes. The depolarizing effect of PGE2 was increased in an extracellular solution with a reduced Cl- concentration (from 145 to 32 mM). PGE2 and the prostaglandin agonists, but not the IP receptor agonist iloprost and the EP2 receptor agonist butaprost, induced a time- and concentration-dependent cAMP accumulation in podocytes. In fura-2 fluorescence experiments, PGE2, sulprostone, PGF2alpha, fluprostenol (a potent FP agonist), and U-46619 (a selective thromboxane A2 agonist) induced a biphasic increase of [Ca2+]i in 60 to 80% of podocytes. In reverse transcription-PCR studies, podocyte mRNA for the EP1, EP4, FP, and TP receptor could be amplified. These data indicate that in podocytes, PGE2 regulates distinct cellular functions via the EP1 and EP4 receptor, thereby increasing [Ca2+]i and cAMP, respectively. Furthermore, PGF1alpha and U-46619 increase [Ca2+]i via their specific receptors. (+info)Calcium isotope fractionation between soft and mineralized tissues as a monitor of calcium use in vertebrates. (3/181)
Calcium from bone and shell is isotopically lighter than calcium of soft tissue from the same organism and isotopically lighter than source (dietary) calcium. When measured as the (44)Ca/(40)Ca isotopic ratio, the total range of variation observed is 5.5 per thousand, and as much as 4 per thousand variation is found in a single organism. The observed intraorganismal calcium isotopic variations and the isotopic differences between tissues and diet indicate that isotopic fractionation occurs mainly as a result of mineralization. Soft tissue calcium becomes heavier or lighter than source calcium during periods when there is net gain or loss of mineral mass, respectively. These results suggest that variations of natural calcium isotope ratios in tissues may be useful for assessing the calcium and mineral balance of organisms without introducing isotopic tracers. (+info)Isotopic evidence for variations in the marine calcium cycle over the Cenozoic. (4/181)
Significant variations in the isotopic composition of marine calcium have occurred over the last 80 million years. These variations reflect deviations in the balance between inputs of calcium to the ocean from weathering and outputs due to carbonate sedimentation, processes that are important in controlling the concentration of carbon dioxide in the atmosphere and, hence, global climate. The calcium isotopic ratio of paleo-seawater is an indicator of past changes in atmospheric carbon dioxide when coupled with determinations of paleo-pH. (+info)High bioavailability of calcium in fortified Horlicks. (5/181)
OBJECTIVE: To compare the bioavailability of calcium carbonate-fortified Horlicks with calcium naturally present in milk. DESIGN: Randomised crossover within-subject comparison using a double label stable isotope technique. SETTING: Institute of Food Research, Human Nutrition Unit. PARTICIPANTS: Sixteen pre-menopausal women aged 23-40 y, habituated to a high-calcium diet (mean 1240 mg/day). RESULTS: Mean true fractional calcium absorption was 38.8% (s.d.+/-14.5) from Horlicks and 21.2% (s.d.+/-4.6) from milk. Significantly more calcium was absorbed from a serving of Horlicks than from the same quantity of calcium present in 420 g semi-skimmed milk (P<0.001). CONCLUSIONS: Fortified Horlicks is a highly bioavailable source of calcium. A single serving, containing at least 500 mg calcium, provides half the reference nutrient intake for the population sub-group with the highest requirement (adolescent boys) and more than half for all others. SPONSORSHIP: SmithKline Beecham funded this research project. (+info)Calcium absorption measured by stable calcium isotopes ((42)Ca & (44)Ca) among Northern Chinese adolescents with low vitamin D status. (6/181)
An adequate calcium intake and vitamin-D status is important for bone mineralization in adolescents. In Northern China, calcium intake and plasma vitamin-D level of adolescents is low due to low consumption of dairy foods and inadequate sunshine exposure. True fractional calcium absorption (TFCA) in Chinese adolescents has never been performed. This study aims to evaluate nutritional adaptation namely, TFCA and urinary calcium excretion among Chinese adolescents in northern China. (+info)Overview of the 7th European symposium on calcium-binding proteins in normal and transformed cells. (7/181)
The strong feature of the meeting was the continuing efforts described in many papers to resolve the multiple ways in which calcium ions are released into cells via messenger signals and then interact with receptors to cause differential internal cellular activation and cell/cell communication. An easy general way to relate these studies to cell components is to start analysis from the genetic structures lying behind all cell activities and then to explore the RNA production, the proteome, the small substrates and calcium levels themselves in turn while referring to the environment of a particular cell, organ or organism. There is then of course the overall physiology. I shall summarize the papers in this order of their main interests. (+info)A novel dual radio- and stable-isotope method for measuring calcium absorption in humans: comparison with the whole-body radioisotope retention method. (8/181)
BACKGROUND: Dietary calcium absorption can be determined only with the use of isotope techniques. Currently used isotope techniques require exclusive equipment or are not true tracer approaches. OBJECTIVE: The objective was to compare a dual-isotope method combining radioisotopes and stable isotopes with a whole-body radioisotope retention method for measuring calcium absorption. DESIGN: Seven healthy adults aged 21-27 y consumed a test meal containing 63 +/- 14 (macro x +/- SD) mg Ca together with a water solution of (47)Ca (0.11 MBq). One hour after ingestion, 18 mg (44)Ca was administered intravenously. All feces and urine were collected for 5 and 6 d, respectively. Calcium absorption was estimated from whole-body retention of the radioisotope 12 times over 3 wk after ingestion and from the excretion of (47)Ca and (44)Ca in a 24-h urine sample collected on day 2. (44)Ca in urine was determined by inductively coupled plasma mass spectrometry. RESULTS: Mean (+/- SD) calcium absorption was 75 +/- 9% with the dual-isotope method and was 74 +/- 8% with the whole-body radioisotope retention method. There was a high degree of agreement between the methods. CONCLUSION: The dual-isotope method is a valid approach for measuring calcium absorption from a single meal. (+info)Calcium isotopes refer to variants of the chemical element calcium (ca) that have different numbers of neutrons in their atomic nuclei, and therefore differ in their atomic masses while having the same number of protons. The most common and stable calcium isotope is Calcium-40, which contains 20 protons and 20 neutrons. However, calcium has several other isotopes, including Calcium-42, Calcium-43, Calcium-44, and Calcium-46 to -52, each with different numbers of neutrons. Some of these isotopes are radioactive and decay over time. The relative abundances of calcium isotopes can vary in different environments and can provide information about geological and biological processes.
Isotopes are variants of a chemical element that have the same number of protons in their atomic nucleus, but a different number of neutrons. This means they have different atomic masses, but share similar chemical properties. Some isotopes are stable and do not decay naturally, while others are unstable and radioactive, undergoing radioactive decay and emitting radiation in the process. These radioisotopes are often used in medical imaging and treatment procedures.
Isotopes of calcium
Alkaline earth metal
Isotopes of unbinilium
Oxygen isotope ratio cycle
Calcium
Klaus Blaum
Calcium carbonate
Carcharodontosaurus
Spinosauridae
Julie Ezold
Irritator
2018 in non-avian dinosaur paleontology
Stable isotope ratio
Isotope dilution
Megalodon
Isotope
Ariel Anbar
Silicon isotope biogeochemistry
Calcium cycle
Richard Eastell
Eagle Station group
Permian-Triassic extinction event
Clathrate gun hypothesis
Ocean acidification
Reference materials for stable isotope analysis
Calcium-48
COLLAPS experiment
K-Ca dating
Calcium caseinate
Nama Group
Isotopes of calcium - Wikipedia
Alaska Volcano Observatory - Calcium isotope compositions of arc magmas; implications for Ca and carbonate recycling in...
Vitamin B₅, calcium salt·H₂O (calcium pantothenate·H₂O) (β-alanyl-¹³C₃, 99%; ¹⁵N, 98%)- Cambridge Isotope Laboratories, CNLM...
Light calcium isotope anomaly observed in continental basaltic lavas: a mixed signal of recycled carbonate and fractionation...
Chondrite diversity revealed by chromium, calcium and magnesium isotopes - Result
Calcium-48, Calcium-48 Isotope, Enriched Calcium-48
Initial Elements and Isotopes - Maple Help
Calcium isotope fractionation during the partial dissolution of artificial calcite
It's Elemental - The Element Calcium
Calcium
PDF) Calcium and its Role in Human Body
Calcium isotopes in scleractinian fossil corals since the Mesozoic: Implications for vital effects and biomineralization...
Isotope - sort by filter
Calcium - Minimalist Portfolio & Blogging Theme by Laborator | ThemeForest
Lunchtime Seminar Schedule | Department of Geology | University of Maryland
Genomic Medicine - Aalborg University's Research Portal
Goldschmidt Conference Archive: Abstract Details
Neodymium
ISOLDE mints chromium for structure studies - CERN Courier
Independent Learning | Physics and Astronomy | Ursinus College
2022 Ernest Rutherford Medal and Prize | Institute of Physics
How to Build a Black Smoker Chimney - Woods Hole Oceanographic Institution
Element-115-Detected-Again
Periodic Table of the Elements: Calcium - Discussion board (posts 421-440)
Laser cooling unlocks metal tracer | Nature Physics
How did dinosaur parents know when their kids | EurekAlert!
Th o Tacail - Google Scholar
Carbonate10
- Calcium-48 isotope is available to order from BuyIsotope.com in Calcium-48 carbonate (CaCO3) chemical form and in Calcium-48 oxide (CaO) chemical form. (buyisotope.com)
- Another carbonate of calcium is Whewellite . (gsu.edu)
- Calcium appears in the carbonate mineral Bensonite . (gsu.edu)
- Called clumped isotope geochemistry, this method analyzes chemical bonds among heavy isotopes in calcium carbonate minerals--the main ingredient in egg shells. (eurekalert.org)
- The ratios of other trace elements in marine shells (such as uranium or zinc) to calcium indicate the availability of carbonate ions. (barbrastreisand.com)
- This will be achieved by collecting specimens of the planktic foraminifera Globigerinoides ruber and analysing the stable oxygen isotope ratios contained within their calcium carbonate tests (shells). (data.gov.uk)
- the ratio of two oxygen isotopes, oxygen-16 ( 16 O) and oxygen-18 ( 18 O), which is determined on calcium carbonate from shells of microfossils that accumulated year by year on the seafloor. (britannica.com)
- Oxygen in otoliths (a calcium carbonate structure in fish ears) is used to determine fish age. (noaa.gov)
- It can determine the age of calcium carbonate formations going back as far as 500,000 years, much further than the widely used radiocarbon method, said the report. (com.pk)
- The shells are made of calcium carbonate, which means that they mainly consist of the elements calcium, carbon and oxygen. (lu.se)
Stable oxygen isotope1
- 2017. Age validation of Pacific cod ( Gadus macrocephalus ) using high-resolution stable oxygen isotope (δ 18O) chronologies in otoliths. (noaa.gov)
Neutron rich3
- Production of very neutron rich isotopes: What should we know? (wikipedia.org)
- ISOLDE's resonant ionisation laser-ion source (RILIS), which provided the first beams of neutron-rich chromium isotopes. (cerncourier.com)
- Measurements of neutron-rich potassium isotopes cast doubt on the new N = 32 magic number below calcium. (iop.org)
Protons4
- How many protons does Calcium-48 isotope have? (buyisotope.com)
- Chromium has 24 protons, situating it squarely between magic calcium (with 20 protons) and nickel (with 28). (cerncourier.com)
- Isotopes are elements having the same number of protons in their nuclei, but different numbers of neutrons. (whoi.edu)
- [a] One of its isotopes, 270 Hs, has magic numbers of both protons and neutrons for deformed nuclei, which gives it greater stability against spontaneous fission . (wikipedia.org)
Radioactive8
- Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. (wikipedia.org)
- Is Calcium-48 isotope radioactive? (buyisotope.com)
- Inhalation when the calcium from the mother's are radioactive. (cdc.gov)
- In Massachusetts, under the supervision of the Massachusetts Institute of Technology (MIT), mentally-challenged students at the local state school were encouraged to consume food and snacks laced with trace amounts of radioactive iron and calcium. (stanford.edu)
- In New York, at Columbia University and Montefiore Hospital, terminally-ill cancer patients were injected with radioactive calcium and strontium. (stanford.edu)
- Similarly, the experiment in which terminally-ill cancer patients were injected radioactive calcium and strontium was also published. (stanford.edu)
- Overall, the net retention of radioactive calcium was found to be higher than that of strontium, 60% to 25%, a function of the kidney preferentially excreting the strontium isotope. (stanford.edu)
- The technique of U-Th dating is based on the radioactive decay of uranium isotopes into thorium. (com.pk)
Ratios5
- The ε54Cr and ε48Ca (ε expresses parts per ten thousand mass-independent isotope deviation) data for ungrouped chondrites also provide important constraints for assessing their relationships to the known chondrite groups, and the radiogenic Mg isotope ratios (μ26Mg*) can be used to track the early solar system history. (ku.dk)
- I will also discuss evidence from D/H ratios in lunar samples, silicon isotopes, and other geochemical evidence that suggests the Theia impactor had ingassed solar nebula hydrogen into its magma ocean and was Mercury-like in its composition. (umd.edu)
- Oxygen isotope ratios provide information about the global ice volume and global climate, and the standard record can be identified world-wide. (data.gov.uk)
- A 200-year archaeozoological record of Pacific cod (Gadus macrocephalus) life history as revealed through ion microprobe oxygen isotope ratios in otoliths. (noaa.gov)
- The ratios of heavy to light isotopes for these three elements, such as the ratio of sulphur 32 to its heavier counterpart, sulphur 34, provide an isotopic fingerprint for each alabaster deposit according to its geological age and the conditions of its formation. (brgm.fr)
Fractionation3
- Supplementary Text includes detailed text for batch melting model, melt-mantle interaction model and pressure effect on Ca isotope fractionation during melting. (mendeley.com)
- We studied the calcium (Ca) isotope fractionation during the partial dissolution of artificial calcite in pure water and in artificial seawater at 20 ◦C. Calcite (1.00 g) was stirred in 500 ml solution while bubbling it with air rich in CO2 gas (400 and 500 ppm). (alquds.edu)
- This phenomenon indicated that partial dissolution occurred without Ca isotope fractionation. (alquds.edu)
Geochemistry1
- The project combines paleontological studies of the calcareous nannoplankton, geochemistry on traditional (Ccarb, Corg) and non-traditional isotope system (Ca, Sr) and climate models. (lu.se)
Strontium8
- Davy was trying to isolate calcium along with magnesium, strontium and barium.Out of alkaline earth group, Ca has achieved the greatest use and tonnage. (researchgate.net)
- Strontium has the same charge as calcium and a number of different, easily measurable isotopes. (whoi.edu)
- Strontium can readily take the place of calcium in the crystalline lattice that forms when anhydrite precipitates. (whoi.edu)
- The concentration of strontium, as well as the ratio of two of its isotopes, strontium 87 and strontium 86, were measured in both vent fluid and in seawater. (whoi.edu)
- Because the ratio of strontium 87 to strontium 86 is higher in seawater than in hydrothermal fluid, it is possible to determine whether the source of the strontium (substituting for calcium in newly formed anhydrite grains) is seawater or vent fluid. (whoi.edu)
- Samples were analyzed to determine the ratio of strontium to calcium, along with levels of the isotopes carbon-13 and oxygen-18. (bibliotecapleyades.net)
- The experiment, conducted at Columbia University, studied the metabolic fate of intravenously administered calcium and strontium. (stanford.edu)
- It therefore contains calcium, sulphur and oxygen as well as traces of strontium. (brgm.fr)
Uranium1
- Fluorine gas is primarily used to make certain chemical compounds, the most important of which is uranium hexafluoride, used in separating isotopes of uranium for use in nuclear reactors and nuclear weapons. (cdc.gov)
Ratio4
- For example, at sea level the expected 41 Ca/Ca saturation limit for rocks that contain calcium is of order 8 × 10 -15 , but the initial 41 Ca/Ca ratio can be much lower and varies over the surface of the Earth due to altitude, erosion and dilution in the oceans. (nature.com)
- This makes interpreting the 41 Ca/Ca isotope ratio complicated. (nature.com)
- In fish otoliths the ratio of oxygen isotopes, 18O/16O and measured as δ18O, is a function of ambient water temperature and to some degree, salinity. (noaa.gov)
- Evaluation of micromilling/conventional isotope ratio mass spectrometry and secondary ion mass spectrometry of δ18O values in fish otoliths for sclerochronology. (noaa.gov)
Shells6
- Calcium is used by many forms of life to make shells and bones. (buyisotope.com)
- They accomplished this by applying their isotope method to mollusk shells that lived in Alberta alongside the dinosaurs. (eurekalert.org)
- Isotopes of boron present in marine shells track ocean water pH. (barbrastreisand.com)
- Elements exist in different variations - isotopes - and it is the proportion of oxygen isotopes in the foram shells that, for example, reveals changes in global temperature and in global ice volume. (lu.se)
- The proportion of carbon isotopes in the shells tells us about changes in ocean circulation, but also of local changes in upwelling areas. (lu.se)
- The proportion of oxygen isotopes in the shells reveals changes in global temperature and in global ice volume. (lu.se)
Neutrons4
- How many neutrons does Calcium-48 isotope have? (buyisotope.com)
- Of particular interest to nuclear physics are isotopes with a large excess of neutrons. (cerncourier.com)
- how many neutrons are in calcium? (tabulka.cz)
- Each has several stable isotopes, which are variants of chemical elements that differ only in the number of their neutrons and therefore mass. (brgm.fr)
40Ca4
- There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and 46Ca), plus one isotope (48Ca) with such a long half-life that for all practical purposes it can be considered stable. (wikipedia.org)
- The 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)
- Unlike cosmogenic isotopes that are produced in the atmosphere, 41Ca is produced by neutron activation of 40Ca. (wikipedia.org)
- 40Ca comprises about 97% of naturally occurring calcium. (wikipedia.org)
Element Calcium2
- Where was the Element Calcium discovered at? (tabulka.cz)
- How much does the element Calcium cost? (tabulka.cz)
Abundant2
Recombinant1
- In combination with recombinant phosphoprotein expression and isotope labelling, novel nano-, micro- and macro-structures will be fabricated and their size and medium resolution substructures determined. (lu.se)
Chromium2
- Long considered the domain of high-energy, in-flight rare-isotope facilities, chromium has now been produced at ISOLDE in prodigious quantities, thanks to a new resonant ionisation laser-ion source (RILIS) scheme. (cerncourier.com)
- The masses of the newly forged chromium isotopes, as measured by ISOLDE's precision Penning-trap mass spectrometer ISOLTRAP, offer insights into its shape and structure. (cerncourier.com)
Magnesium2
Compositions2
- Because dentine is not remodeled and contains collagen, nitrogen stable isotope compositions (δ15 N) reflect nursing and weaning events, life history traits that would otherwise be impossible to retrieve in such elusive marine animals. (bvsalud.org)
- METHODS: Here, we present a multiproxy approach to investigate the use of Ca isotope compositions (δ44/42 Ca) in relation to δ15 N and laser ablation profiles for different trace metal (Ba, Mg, Sr, Zn) concentrations across the dentine of a single individual of the common bottlenose dolphin Tursiops truncatus. (bvsalud.org)
Periodic Table1
- Calcium is a soft grey metallic element belonging to group 2 of the periodic table. (buyisotope.com)
Boron1
- Calcium is found with boron in the silicate minerals danburite , datolite and Howlite and in the oxide inyoite . (gsu.edu)
Decay2
Seawater3
- Anhydrite, or calcium sulfate (CaSO4), is an unusual mineral because it is more soluble in seawater at low temperatures than at high temperatures. (whoi.edu)
- Calcium, however, is present in both seawater and hydrothermal fluid. (whoi.edu)
- That made it more difficult at first to determine whether the initial anhydrite chimney wall formed solely from seawater that was heated by hydrothermal fluids, or from the mixing of cold, sulfate-rich seawater with hot, calcium-rich hydrothermal fluid. (whoi.edu)
Laboratories2
- Measurement of the ionized calcium component is generally obtained in specialized laboratories and through a special procedure. (medscape.com)
- In most laboratories, autoanalyzers are used to measure the total serum calcium level accurately and reproducibly, although atomic absorption spectrophotometers probably provide even greater accuracy. (medscape.com)
High-precision2
Ions2
- Rudolph's team created element 115 by aiming a beam of calcium ions at an americium target. (acs.org)
- In the nervous system, lead crosses the blood-brain barrier by displacing calcium ions. (medscape.com)
Phosphate3
- Graftonite is a phosphate mineral of iron, manganese and calcium. (gsu.edu)
- Many biofluids are super saturated with respect to hydroxyapatite (HA) by forming complexes between phosphopolypeptides/phosphoproteins and amorphous calcium phosphate (ACP). (lu.se)
- The structures of composite materials comprising phosphopolypeptides and calcium phosphate with very different neutron scattering length densities are well suited to being studied by neutron scattering and diffraction methods. (lu.se)
Nuclear2
Abundance1
- What is Calcium-48 isotope natural abundance? (buyisotope.com)
Atomic3
- What is atomic mass for Calcium-48 isotope? (buyisotope.com)
- im only 8, what is the atomic number of calcium? (tabulka.cz)
- The atomic number of calcium is 20. (tabulka.cz)
Teeth3
- Calcium is very essential in muscle contraction, oocyte activation, building strong bones and teeth, blood clotting, nerve impulse, transmission, regulating heart beat and fluid balance within cells. (researchgate.net)
- That study looked at calcium isotopes preserved within the teeth, but the exterior of a tooth can be just as informative. (discovermagazine.com)
- Once in the body, Sr-90 acts like calcium and is readily incorporated into bones and teeth, where it can cause cancers of the bone, bone marrow, and soft tissues around the bone. (cdc.gov)
Copper2
- Calcium is used as a deoxidizer to remove oxygen from iron and steel in their production and in the production of copper and copper alloys. (gsu.edu)
- Under his leadership, recent CRIS science highlights include measurements of charge radii of copper isotopes that have driven the first consistent microscopic description of odd-even staggering using effective-field and density functional theory. (iop.org)
Mass1
- Techniques using mass spectrometry and a double spike isotope dilution have been used for K-Ca age dating. (wikipedia.org)
Readily1
- Sodium fluoride readily dissolves in water, but calcium fluoride does not. (cdc.gov)
Bones1
- No acute-, intermediate-, or chronic- bone is being used to build the bones of plutonium isotopes are 87.7, 24,100, the fetus. (cdc.gov)
Gypsum2
- In nature, calcium occurs in the form of gypsum , which is calcium sulfate CaSO 4 .2H 2 O . Calcium sulfate, CaSO 4 , without the attached water molecules also occurs in the form of the mineral anhydrite . (gsu.edu)
- From a chemical perspective, white alabaster is calcium sulphate, that is, nothing more than gypsum or its close relative, anhydrite. (brgm.fr)
Earth's1
- 3.2% of calcium is in the earth's crust. (tabulka.cz)
Present1
- The ages and timelines of Martian rock formation can be calculated from the amount of neodymium and tungsten isotopes present. (chemicool.com)
Oxide1
- Titanium and calcium form the oxide perovskite , CaTiO 3 . (gsu.edu)
Half-lives2
- All other calcium isotopes have half-lives measured in minutes or less. (wikipedia.org)
- its most stable known isotopes have half-lives of approximately ten seconds. (wikipedia.org)
Years1
- Calcium-41 is produced in the upper lithosphere due to neutron capture by 40 Ca, and has a half-life of around 99,000 years, which makes it an interesting isotope for tracer applications. (nature.com)
Concentration4
- Calcium concentration, both total and free, is characterized by a high physiological variation, depending on age, sex, physiological state (eg, pregnancy), and even season (owing to the seasonal variation of vitamin D, which is directly involved in the regulation of calcium concentration). (medscape.com)
- Unless serum proteins contain abnormalities, total serum calcium concentration is normally between 8.5 and 10.2 mg/dL of serum. (medscape.com)
- Because ionized calcium is the only component of the total serum calcium level that is regulated by calciotropic hormones, decisions on the total serum calcium concentration should not be made unless changes in concentrations of plasma proteins, particularly albumin , are considered. (medscape.com)
- In patients multiple myeloma, the globulin concentration is often increased, leading to excessive binding of calcium to the monoclonal paraprotein and occasional elevation of the total serum calcium concentration, yet the ionized calcium level may be normal in these individuals. (medscape.com)
Reaction1
- It resembles calcium in its reaction with water. (lanl.gov)
Latin1
- Sir Humphrey Davis discovered Calcium and named it calx, calcis, or calz for lime in Latin. (tabulka.cz)
Bone3
- Long term of calcium deficiency can lead to oestoporosis in which the bone deteriorates and there is an increased rise of fractures. (researchgate.net)
- It was found that though the isotopes were essentially equally absorbed by the bone and soft tissue immediately after administration, over time, more than 99% of the fraction of both isotopes remaining in the body was found exclusively in the bone. (stanford.edu)
- It should be emphasized that these patients frequently have bone lesions, which leads to release of calcium from the damaged bone tissue. (medscape.com)
Occurs1
- The simple calcium silicate, CaSiO 3 , occurs in the mineral wollastonite . (gsu.edu)