Calcium radioisotopes. Medical search

Unstable isotopes of calcium that decay or disintegrate emitting radiation. Ca atoms with atomic weights 39, 41, 45, 47, 49, and 50 are radioactive calcium isotopes.

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)

Unstable isotopes of zinc that decay or disintegrate emitting radiation. Zn atoms with atomic weights 60-63, 65, 69, 71, and 72 are radioactive zinc isotopes.

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.

Method for assessing flow through a system by injection of a known quantity of radionuclide into the system and monitoring its concentration over time at a specific point in the system. (From Dorland, 28th ed)

Unstable isotopes of strontium that decay or disintegrate spontaneously emitting radiation. Sr 80-83, 85, and 89-95 are radioactive strontium isotopes.

Voltage-dependent cell membrane glycoproteins selectively permeable to calcium ions. They are categorized as L-, T-, N-, P-, Q-, and R-types based on the activation and inactivation kinetics, ion specificity, and sensitivity to drugs and toxins. The L- and T-types are present throughout the cardiovascular and central nervous systems and the N-, P-, Q-, & R-types are located in neuronal tissue.

Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.

Calcium compounds used as food supplements or in food to supply the body with calcium. Dietary calcium is needed during growth for bone development and for maintenance of skeletal integrity later in life to prevent osteoporosis.

Unstable isotopes of krypton that decay or disintegrate emitting radiation. Kr atoms with atomic weights 74-77, 79, 81, 85, and 87-94 are radioactive krypton isotopes.

Unstable isotopes of indium that decay or disintegrate emitting radiation. In atoms with atomic weights 106-112, 113m, 114, and 116-124 are radioactive indium isotopes.

Stable calcium atoms that have the same atomic number as the element calcium, but differ in atomic weight. Ca-42-44, 46, and 48 are stable calcium isotopes.

Unstable isotopes of sodium that decay or disintegrate emitting radiation. Na atoms with atomic weights 20-22 and 24-26 are radioactive sodium isotopes.

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)

Unstable isotopes of barium that decay or disintegrate emitting radiation. Ba atoms with atomic weights 126-129, 131, 133, and 139-143 are radioactive barium isotopes.

The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph.

Unstable isotopes of yttrium that decay or disintegrate emitting radiation. Y atoms with atomic weights 82-88 and 90-96 are radioactive yttrium isotopes.

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.

Unstable isotopes of tin that decay or disintegrate emitting radiation. Sn atoms with atomic weights 108-111, 113, 120-121, 123 and 125-128 are tin radioisotopes.

Unstable isotopes of carbon that decay or disintegrate emitting radiation. C atoms with atomic weights 10, 11, and 14-16 are radioactive carbon isotopes.

Unstable isotopes of iron that decay or disintegrate emitting radiation. Fe atoms with atomic weights 52, 53, 55, and 59-61 are radioactive iron isotopes.

Unstable isotopes of phosphorus that decay or disintegrate emitting radiation. P atoms with atomic weights 28-34 except 31 are radioactive phosphorus isotopes.

Unstable isotopes of copper that decay or disintegrate emitting radiation. Cu atoms with atomic weights 58-62, 64, and 66-68 are radioactive copper isotopes.

High energy POSITRONS or ELECTRONS ejected from a disintegrating atomic nucleus.

Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements.

The first artificially produced element and a radioactive fission product of URANIUM. Technetium has the atomic symbol Tc, atomic number 43, and atomic weight 98.91. All technetium isotopes are radioactive. Technetium 99m (m=metastable) which is the decay product of Molybdenum 99, has a half-life of about 6 hours and is used diagnostically as a radioactive imaging agent. Technetium 99 which is a decay product of technetium 99m, has a half-life of 210,000 years.

Unstable isotopes of mercury that decay or disintegrate emitting radiation. Hg atoms with atomic weights 185-195, 197, 203, 205, and 206 are radioactive mercury isotopes.

A gamma-emitting radionuclide imaging agent used for the diagnosis of diseases in many tissues, particularly in the gastrointestinal system, liver, and spleen.

A salt used to replenish calcium levels, as an acid-producing diuretic, and as an antidote for magnesium poisoning.

Stable cesium atoms that have the same atomic number as the element cesium, but differ in atomic weight. Cs-133 is a naturally occurring isotope.

Stable cobalt atoms that have the same atomic number as the element cobalt, but differ in atomic weight. Co-59 is a stable cobalt isotope.

Unstable isotopes of cerium that decay or disintegrate emitting radiation. Ce atoms with atomic weights 132-135, 137, 139, and 141-148 are radioactive cerium isotopes.

Hafnium. A metal element of atomic number 72 and atomic weight 178.49, symbol Hf. (From Dorland, 28th ed)

Unstable isotopes of gold that decay or disintegrate emitting radiation. Au 185-196, 198-201, and 203 are radioactive gold isotopes.

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.

Unstable isotopes of lead that decay or disintegrate emitting radiation. Pb atoms with atomic weights 194-203, 205, and 209-214 are radioactive lead isotopes.

Any diagnostic evaluation using radioactive (unstable) isotopes. This diagnosis includes many nuclear medicine procedures as well as radioimmunoassay tests.

Unstable isotopes of sulfur that decay or disintegrate spontaneously emitting radiation. S 29-31, 35, 37, and 38 are radioactive sulfur isotopes.

Stable zinc atoms that have the same atomic number as the element zinc, but differ in atomic weight. Zn-66-68, and 70 are stable zinc isotopes.

Long-lasting voltage-gated CALCIUM CHANNELS found in both excitable and nonexcitable tissue. They are responsible for normal myocardial and vascular smooth muscle contractility. Five subunits (alpha-1, alpha-2, beta, gamma, and delta) make up the L-type channel. The alpha-1 subunit is the binding site for calcium-based antagonists. Dihydropyridine-based calcium antagonists are used as markers for these binding sites.

Unstable isotopes of cadmium that decay or disintegrate emitting radiation. Cd atoms with atomic weights 103-105, 107, 109, 115, and 117-119 are radioactive cadmium isotopes.

Astatine. A radioactive halogen with the atomic symbol At, atomic number 85, and atomic weight 210. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism.

The calcium salt of oxalic acid, occurring in the urine as crystals and in certain calculi.

Radiotherapy where cytotoxic radionuclides are linked to antibodies in order to deliver toxins directly to tumor targets. Therapy with targeted radiation rather than antibody-targeted toxins (IMMUNOTOXINS) has the advantage that adjacent tumor cells, which lack the appropriate antigenic determinants, can be destroyed by radiation cross-fire. Radioimmunotherapy is sometimes called targeted radiotherapy, but this latter term can also refer to radionuclides linked to non-immune molecules (see RADIOTHERAPY).

Lutetium. An element of the rare earth family of metals. It has the atomic symbol Lu, atomic number 71, and atomic weight 175.

Rhenium. A metal, atomic number 75, atomic weight 186.2, symbol Re. (Dorland, 28th ed)

The calcium salt of gluconic acid. The compound has a variety of uses, including its use as a calcium replenisher in hypocalcemic states.

Samarium. An element of the rare earth family of metals. It has the atomic symbol Sm, atomic number 62, and atomic weight 150.36. The oxide is used in the control rods of some nuclear reactors.

Compounds that are used in medicine as sources of radiation for radiotherapy and for diagnostic purposes. They have numerous uses in research and industry. (Martindale, The Extra Pharmacopoeia, 30th ed, p1161)

Pollutants, present in soil, which exhibit radioactivity.

Detection and counting of scintillations produced in a fluorescent material by ionizing radiation.

Unstable isotopes of bromine that decay or disintegrate emitting radiation. Br atoms with atomic weights 74-78, 80, and 82-90 are radioactive bromine isotopes.

Leakage and accumulation of CEREBROSPINAL FLUID in the subdural space which may be associated with an infectious process; CRANIOCEREBRAL TRAUMA; BRAIN NEOPLASMS; INTRACRANIAL HYPOTENSION; and other conditions.

Liquid, solid, or gaseous waste resulting from mining of radioactive ore, production of reactor fuel materials, reactor operation, processing of irradiated reactor fuels, and related operations, and from use of radioactive materials in research, industry, and medicine. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Normal human serum albumin mildly iodinated with radioactive iodine (131-I) which has a half-life of 8 days, and emits beta and gamma rays. It is used as a diagnostic aid in blood volume determination. (from Merck Index, 11th ed)

Unstable isotopes of ruthenium that decay or disintegrate emitting radiation. Ru atoms with atomic weights 93-95, 97, 103, and 105-108 are radioactive ruthenium isotopes.

Uptake of substances through the lining of the INTESTINES.

Techniques used to determine the age of materials, based on the content and half-lives of the RADIOACTIVE ISOTOPES they contain.

Unstable isotopes of selenium that decay or disintegrate emitting radiation. Se atoms with atomic weights 70-73, 75, 79, 81, and 83-85 are radioactive selenium isotopes.

Accumulation of a drug or chemical substance in various organs (including those not relevant to its pharmacologic or therapeutic action). This distribution depends on the blood flow or perfusion rate of the organ, the ability of the drug to penetrate organ membranes, tissue specificity, protein binding. The distribution is usually expressed as tissue to plasma ratios.

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.

Inorganic compounds that contain calcium as an integral part of the molecule.

The rate dynamics in chemical or physical systems.

A class of organic compounds containing a ring structure made up of more than one kind of atom, usually carbon plus another atom. The ring structure can be aromatic or nonaromatic.

A gamma-emitting radionuclide imaging agent used for the diagnosis of diseases in many tissues, particularly in the gastrointestinal system, cardiovascular and cerebral circulation, brain, thyroid, and joints.

Tungsten. A metallic element with the atomic symbol W, atomic number 74, and atomic weight 183.85. It is used in many manufacturing applications, including increasing the hardness, toughness, and tensile strength of steel; manufacture of filaments for incandescent light bulbs; and in contact points for automotive and electrical apparatus.

Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)

CALCIUM CHANNELS that are concentrated in neural tissue. Omega toxins inhibit the actions of these channels by altering their voltage dependence.

An iron chelating agent with properties like EDETIC ACID. DTPA has also been used as a chelator for other metals, such as plutonium.

A series of steps taken in order to conduct research.

A type of high-energy radiotherapy using a beam of gamma-radiation produced by a radioisotope source encapsulated within a teletherapy unit.

A chelating agent relatively more specific for calcium and less toxic than EDETIC ACID.

Determination of the energy distribution of gamma rays emitted by nuclei. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Elements of limited time intervals, contributing to particular results or situations.

A specialty field of radiology concerned with diagnostic, therapeutic, and investigative use of radioactive compounds in a pharmaceutical form.

A technetium imaging agent used in renal scintigraphy, computed tomography, lung ventilation imaging, gastrointestinal scintigraphy, and many other procedures which employ radionuclide imaging agents.

Agents that increase calcium influx into calcium channels of excitable tissues. This causes vasoconstriction in VASCULAR SMOOTH MUSCLE and/or CARDIAC MUSCLE cells as well as stimulation of insulin release from pancreatic islets. Therefore, tissue-selective calcium agonists have the potential to combat cardiac failure and endocrinological disorders. They have been used primarily in experimental studies in cell and tissue culture.

The measurement of radiation by photography, as in x-ray film and film badge, by Geiger-Mueller tube, and by SCINTILLATION COUNTING.

The physical or physiological processes by which substances, tissue, cells, etc. take up or take in other substances or energy.

Compounds that contain the triphenylmethane aniline structure found in rosaniline. Many of them have a characteristic magenta color and are used as COLORING AGENTS.

A form species of spore-producing CYANOBACTERIA, in the family Nostocaceae, order Nostocales. It is an important source of fixed NITROGEN in nutrient-depleted soils. When wet, it appears as a jelly-like mass.

Measurement of radioactivity in the entire human body.

Unstable isotopes of potassium that decay or disintegrate emitting radiation. K atoms with atomic weights 37, 38, 40, and 42-45 are radioactive potassium isotopes.

An ionophorous, polyether antibiotic from Streptomyces chartreusensis. It binds and transports CALCIUM and other divalent cations across membranes and uncouples oxidative phosphorylation while inhibiting ATPase of rat liver mitochondria. The substance is used mostly as a biochemical tool to study the role of divalent cations in various biological systems.

Agents that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags.

An iodine-containing compound used in pyelography as a radiopaque medium. If labeled with radioiodine, it can be used for studies of renal function.

A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principle cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.

Stable carbon atoms that have the same atomic number as the element carbon, but differ in atomic weight. C-13 is a stable carbon isotope.

A white powder prepared from lime that has many medical and industrial uses. It is in many dental formulations, especially for root canal filling.

The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.

A non-metal element that has the atomic symbol P, atomic number 15, and atomic weight 31. It is an essential element that takes part in a broad variety of biochemical reactions.

A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure.

A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.

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).

A polypeptide hormone (84 amino acid residues) secreted by the PARATHYROID GLANDS which performs the essential role of maintaining intracellular CALCIUM levels in the body. Parathyroid hormone increases intracellular calcium by promoting the release of CALCIUM from BONE, increases the intestinal absorption of calcium, increases the renal tubular reabsorption of calcium, and increases the renal excretion of phosphates.

A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.

Modulation of calcium mobilization in aortic rings of pregnant rats: Contribution of extracellular calcium and of voltage-operated calcium channels. (1/407)

Pregnancy is associated with decreased vascular responsiveness to vasopressor stimuli. We have tested the involvement of Ca2+ mobilization in myotropic responses of aortic rings obtained from pregnant and virgin rats. Contractions of the rings to phenylephrine, in the absence of calcium in the bathing medium, were lower in tissues from virgin than from pregnant rats. Concentration-response curves to CaCl2 that were measured after stimulation by phenylephrine in the absence of Ca2+ were shifted to higher levels of contraction. This was not observed when KCl was used to prestimulate the aorta. D-600, a phenylalkylamine calcium channel blocker, similarly inhibited these responses to CaCl2 in tissues from both pregnant and virgin animals. D-600 exerted a concentration-dependent inhibition of responses to phenylephrine and KCl. However, the calcium antagonist was less effective in aortic rings of pregnant than of virgin rats. Basal 45Ca2+ uptake was lower in aortic rings from pregnant than from virgin rats, and Bay K 8644 was unable to reverse this difference. The time course of basal and stimulated (KCl) 45Ca2+ influx was lower in aorta of pregnant rats at all times studied. Moreover, when the intracellular calcium pools were emptied with phenylephrine, the refilling of these pools was delayed in aortic rings of pregnant rats. These results indicate an altered extracellular calcium mobilization of aortic rings from pregnant rats. These changes may be due to a functional alteration of the voltage-operated calcium channels during pregnancy. (+info)

A non-pungent triprenyl phenol of fungal origin, scutigeral, stimulates rat dorsal root ganglion neurons via interaction at vanilloid receptors. (2/407)

1. A [3H]-resiniferatoxin (RTX) binding assay utilizing rat spinal cord membranes was employed to identify novel vanilloids in a collection of natural products of fungal origin. Of the five active compounds found (scutigeral, acetyl-scutigeral, ovinal, neogrifolin, and methyl-neogrifolin), scutigeral (Ki=19 microM), isolated from the edible mushroom Albatrellus ovinus, was selected for further characterization. 2. Scutigeral induced a dose-dependent 45Ca uptake by rat dorsal root ganglion neurons with an EC50 of 1.6 microM, which was fully inhibited by the competitive vanilloid receptor antagonist capsazepine (IC50=5.2 microM). 3. [3H]-RTX binding isotherms were shifted by scutigeral (10-80 microM) in a competitive manner. The Schild plot of the data had a slope of 0.8 and gave an apparent Kd estimate for scutigeral of 32 microM. 4. Although in the above assays scutigeral mimicked capsaicin, it was not pungent on the human tongue up to a dose of 100 nmol per tongue, nor did it provoke protective wiping movements in the rat (up to 100 microM) upon intraocular instillation. 5. In accord with being non-pungent, scutigeral (5 microM) did not elicit a measurable inward current in isolated rat dorsal root ganglion neurons under voltage-clamp conditions. It did, however, reduce the proportion of neurons (from 61 to 15%) that responded to a subsequent capsaicin (1 microM) challenge. In these neurons, scutigeral both delayed (from 27 to 72 s) and diminished (from 5.0 to 1.9 nA) the maximal current evoked by capsaicin. 6. In conclusion, scutigeral and its congeners form a new chemical class of vanilloids, the triprenyl phenols. Scutigeral promises to be a novel chemical lead for the development of orally active, non-pungent vanilloids. (+info)

Ni2+ transport by the human Na+/Ca2+ exchanger expressed in Sf9 cells. (3/407)

The mechanism of Ni2+ block of the Na+/Ca2+ exchanger was examined in Sf 9 cells expressing the human heart Na+/Ca2+ exchanger (NCX1-NACA1). As predicted from the reported actions of Ni2+, its application reduced extracellular Na+-dependent changes in intracellular Ca2+ concentration (measured by fluo 3 fluorescence changes). However, contrary to expectation, the reduced fluorescence was accompanied by measured 63Ni2+ entry. The 63Ni2+ entry was observed in Sf 9 cells expressing the Na+/Ca2+ exchanger but not in control cells. The established sequential transport mechanism of the Na+/Ca2+ exchanger could be compatible with these results if one of the two ion translocation steps is blocked by Ni2+ and the other permits Ni2+ translocation. We conclude that, because Ni2+ entry was inhibited by extracellular Ca2+ and enhanced by extracellular Na+, the Ca2+ translocation step moved Ni2+, whereas the Na+ translocation step was inhibited by Ni2+. A model is presented to discuss these findings. (+info)

Chronic fluoride ingestion decreases 45Ca uptake by rat kidney membranes. (4/407)

High exposures to fluoride (F-) may occur in environments rich in F- from natural or industrial sources and from misuse of F--containing dental care products, particularly by children. Both acute and chronic exposures to elevated levels of F- have negative effects on several calcium-dependent processes, including kidney glomerular and tubular function. We examined the effect of chronic F- ingestion on ATP-dependent 45Ca uptake by rat kidney membrane vesicles to characterize the mechanism by which high F- alters Ca++ transport in the kidney. Twenty weanling female Sprague-Dawley rats were raised on low-F- (0.9 mg/L), semi-purified diet with a Ca++ concentration of 400 mg/100g diet. Rats were divided into four groups and were fed ad libitum deionized water containing F- at 0, 10, 50, or 150 mg/L added as NaF for 6 wk. This consumption produced plasma F- levels of <0.4, 2, 7, or 35 micromol/L, respectively. ATP-dependent 45Ca uptake was significantly lower in the 150 mg F-/L exposure group than in the 0 mg F-/L controls (P < 0.05). Studies with thapsigargin, a specific inhibitor of the endoplasmic reticulum Ca++-pump, showed that the lower uptake was associated with significantly lower activities of both the plasma membrane Ca++-pump (P < 0.05, 150 mg F-/L group versus control) and endoplasmic reticulum Ca++-pump (P < 0.05 for both the 50 and 150 mg F-/L groups versus control). Slot blot analysis of kidney homogenates with specific Ca++-pump antibodies showed less (P < 0.05) endoplasmic reticulum Ca++-pump protein and plasma membrane Ca++-pump protein in all treatment groups than controls. Both Ca++-pumps are transport molecules of great importance in the regulation of Ca++ homeostasis. Our study suggests that chronic, high F- ingestion producing high plasma F- levels may occur in humans and may affect Ca++ homeostasis by increasing the turnover or breakdown or decreasing the expression of plasma membrane and endoplasmic reticulum Ca++-pump proteins. (+info)

Stimulation of neutrophils by prenylcysteine analogs: Ca(2+) release and influx. (5/407)

Farnesylthiosalicylic acid (FTS), a synthetic analog of the terminal prenylcysteine present in signaling proteins induces generation of superoxide ions, phospholipase C-driven hydrolysis of inositol lipids and calcium elevation in human neutrophils and DMSO-differentiated HL60 cells. These effects were ascribed to an interaction of the analog with elements responsible for recognition of specific prenylated proteins. The present study demonstrated that in addition to the release of intracellular calcium stores, FTS enhanced entry of Ca(2+) and Mn(2+) from the medium. The biphasic dependence of the influx on the concentration of FTS, as well as its insensitivity to inhibition by PMA and La(3+) suggest that the influx pathway activated by FTS is distinct from the previously described store-operated calcium channels of neutrophils. Consistent with the participation of a cellular membrane component in the interaction, FTS enhanced (45)Ca uptake in neutrophils and neutrophil cell membranes, but not in multilamellar vesicles. To establish specificity of the farnesyl moiety of FTS (C(15)), effects of three other analogs, geranylthiosalicylate, GTS (C(10)), geranylgeranylthiosalicylate, GGTS (C(20)), as well as the carboxymethyl ester FTS-Me on calcium homeostasis and superoxide production were investigated. GGTS dose-dependently elevated [Ca(2+)](i), induced quenching of the 360 nm Fura-2-calcium fluorescence by Mn(2+) and stimulated superoxide release, while GTS and FTS-Me were inactive. These results defined specific structural requirements for the functional interaction of prenylcysteine analogs with myeloid cells. (+info)

Intracellular Ca(2+)-Mg(2+)-ATPase regulates calcium influx and acrosomal exocytosis in bull and ram spermatozoa. (6/407)

Calcium influx is required for the mammalian sperm acrosome reaction (AR), an exocytotic event occurring in the sperm head prior to fertilization. We show here that thapsigargin, a highly specific inhibitor of the microsomal Ca(2+)-Mg(2+)-ATPase (Ca(2+) pump), can initiate acrosomal exocytosis in capacitated bovine and ram spermatozoa. Initiation of acrosomal exocytosis by thapsigargin requires an influx of Ca(2+), since incubation of cells in the absence of added Ca(2+) or in the presence of the calcium channel blocker, La(3+), completely inhibited thapsigargin-induced acrosomal exocytosis. ATP-Dependent calcium accumulation into nonmitochondrial stores was detected in permeabilized sperm in the presence of ATP and mitochondrial uncoupler. This activity was inhibited by thapsigargin. Thapsigargin elevated the intracellular Ca(2+) concentration ([Ca(2+)](i)), and this increase was inhibited when extracellular Ca(2+) was chelated by EGTA, indicating that this rise in Ca(2+) is derived from the external medium. This rise of [Ca(2+)](i) took place first in the head and later in the midpiece of the spermatozoon. However, immunostaining using a polyclonal antibody directed against the purified inositol 1,4,5-tris-phosphate receptor (IP(3)-R) identified specific staining in the acrosome region, in the postacrosome, and along the tail, but not in the midpiece region. No staining in the acrosome region was observed in sperm without acrosome, indicating that the acrosome cap was stained in intact sperm. The presence of IP(3)-R in the anterior acrosomal region as well as the induction, by thapsigargin, of intracellular Ca(2+) elevation in the acrosomal region and acrosomal exocytosis, implicates the acrosome as a potential cellular Ca(2+) store. We suggest here that the cytosolic Ca(2+) is actively transported into the acrosome by an ATP-dependent, thapsigargin-sensitive Ca(2+) pump and that the accumulated Ca(2+) is released from the acrosome via an IP(3)-gated calcium channel. The ability of thapsigargin to increase [Ca(2+)](i) could be due to depletion of Ca(2+) in the acrosome, resulting in the opening of a capacitative calcium entry channel in the plasma membrane. The effect of thapsigargin on elevated [Ca(2+)](i) in capacitated cells was 2-fold higher than that in noncapacitated sperm, suggesting that the intracellular Ca pump is active during capacitation and that this pump may have a role in regulating [Ca(2+)](i) during capacitation and the AR. (+info)

Demonstration of the rapid action of pure crystalline 1 alpha-hydroxy vitamin D3 and 1 alpha,25-dihydroxy vitamin D3 on intestinal calcium uptake. (7/407)

The biological effects of crystalline 1alpha-hydroxyvitamin D3 and crystalline 1alpha,25-dihydroxyvitamin D3 have been compared on the intestinal uptake of calcium-45 by everted duodenal gut sacs from rachitic rats. Peak calcium-45 uptake was observed 1 hr after intravenous administration and both crystalline vitamin D2 analogs were of comparable potency. The rapid onset of calcium-45 uptake and the rapid attainment of maximal calcium-45 transport suggests a direct effect of these crystalline analogs on the mucosal membranes of the intestinal cell. (+info)

Xestoquinone, isolated from sea sponge, causes Ca(2+) release through sulfhydryl modification from skeletal muscle sarcoplasmic reticulum. (8/407)

Xestoquinone (XQN) (3 x 10(-7) to 3 x 10(-3) M), isolated from the sea sponge Xestospongia sapra, induced a concentration-dependent Ca(2+) release from the heavy fraction of fragmented sarcoplasmic reticulum (HSR) of rabbit skeletal muscle with an EC(50) value of approximately 30 microM. On the basis of the EC(50), XQN is 10 times more potent than caffeine. Dithiothreitol completely blocked XQN-induced Ca(2+) release from HSR without affecting that induced by caffeine. Caffeine-induced Ca(2+) release was reduced markedly by Mg(2+), procaine, and ruthenium red, agents that are known to block release of Ca(2+) from sarcoplasmic reticulum, whereas that induced by XQN was not inhibited. The bell-shaped profile of Ca(2+) dependence for XQN was significantly shifted upward in a wider range of pCa (between 7 and 3), whereas that for caffeine was shifted to the left in a narrower range of pCa (between 8 and 7). The maximum response to caffeine in (45)Ca(2+) release was not affected by 9-methyl-7-bromoeudistomin D, whereas the response was further increased by XQN. XQN caused a concentration-dependent decrease in [(3)H]ryanodine binding to HSR. This effect of XQN also was abolished in the presence of dithiothreitol. Scatchard analysis revealed that the mode of inhibition by XQN was noncompetitive in [(3)H]ryanodine binding to HSR. These results indicate that sulfhydryl groups are involved in both the XQN effect on ryanodine binding and on Ca(2+) release. (+info)

Radioisotope Studies at the Fernald State School, Massachusetts". Retrieved 2017-06-24. SHARPE LM, PEACOCK WC, COOKE R, HARRIS ... MIT Professor of Nutrition Robert S. Harris led the experiment, which studied the absorption of calcium and iron. The boys were ... The 57 club members ate iron-enriched cereals and calcium-enriched milk for breakfast. In order to track absorption, several ... BRONNER F, HARRIS RS, MALETSKOS CJ, BENDA CE (January 1956). "Studies in calcium metabolism. the fate of intravenously injected ...

https://en.wikipedia.org/wiki/Walter_E._Fernald_Developmental_Center

Another use is as a carrier of strontium-90 radioisotope in radioisotope thermoelectric generators. https://www.mindat.org/min- ... Its optical properties are intermediate to calcium fluoride and barium fluoride. Strontium fluoride is used as an optical ...

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

Several radioisotopes of strontium, for example, are recognized as analogs of calcium and incorporated within Micrococcus ... Radioisotopes can be transformed directly through changes in valence state by acting as acceptors or by acting as cofactors to ... The radioisotope interact with binding sites of metabolically active cells and is used as terminal electron acceptor in the ... Moreover, in groundwater abound radius radioisotopes such as radium-226 and radium-228 (228Ra). They are also habitual in ...

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

In the presence of calcium ions, strontium commonly forms coprecipitates with calcium minerals such as calcite and anhydrite at ... "Radioisotopes That May Impact Food Resources" (PDF). Epidemiology, Health and Social Services, State of Alaska. Archived from ... The similarity to calcium and the chance that the strontium-90 might become enriched in bones made research on the metabolism ... In biological systems, calcium is substituted to a small extent by strontium. In the human body, most of the absorbed strontium ...

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

Radioisotope Power Systems (2009). Radioisotope Power Systems: An Imperative for Maintaining U.S. Leadership in Space ... It can also detect the loss of calcium in the hip and back bones, allowing the ability to diagnose osteoporosis. Gadolinium-148 ... Thirty radioisotopes have been characterized, with the most stable being alpha-decaying 152Gd (naturally occurring) with a half ... It ensures that the machines work correctly to produce images of radioisotope distribution inside the patient. This isotope is ...

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

This paper also reports details of the effect of potassium, ammonium and calcium ions on the uptake of the radioisotopes. In ... Just because a radioisotope is released it does not mean it will enter a human and then cause harm. For instance, the migration ... Most nuclear fuel is uranium dioxide, which is a cubic solid with a structure similar to that of calcium fluoride. In used fuel ... If the radioisotope is tightly bound to the minerals in the soil, then less radioactivity can be absorbed by crops and grass ...

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

... the metabolism of calcium attracted very early the interest of physicians looking for applying radioisotopes of calcium for ... was absorbed by the human body in a manner similar to calcium. His work with strontium-89, a calcium analogue, eventually led ... The bones are largely composed of calcium and phosphorus in the form of tricalcium phosphate. W. Wesley Campbell and David M. ... It was the third medical radioisotope, after phosphorus-32 and iodine-131 introduced respectively by John H. Lawrence and ...

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

It causes health problems, as it substitutes for calcium in bone, preventing expulsion from the body. Because it is a long- ... 89Sr is an artificial radioisotope used in treatment of bone cancer. In circumstances where cancer patients have widespread and ... Because strontium has an electron configuration similar to that of calcium, it readily substitutes for Ca in minerals. ...

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

There is a section for each radioisotope with a table of radiopharmaceuticals using that radioisotope. The sections are ordered ... Calcium-47Edit. 47Ca is a beta and gamma emitter. Name Investigation Route of administration In-vitro / in-vivo Imaging / non- ... Some radioisotopes* are used in ionic or inert form without attachment to a pharmaceutical, these are also included. ... making it more useful as a therapeutic isotope for brachytherapy implant of radioisotope capsules for local treatment of ...

https://en.m.wikipedia.org/wiki/Radiopharmaceutical

The strontium radioisotopes are very important, as strontium is a calcium mimic which is incorporated in bone growth and ... It is the most significant radioisotope left in the area around Chernobyl. Caesium-134 is found in spent nuclear fuel but is ...

https://en.wikipedia.org/wiki/Fission_products_(by_element)

Here is a list of radioisotopes formed by the action of cosmic rays; the list also contains the production mode of the isotope ... notably calcium-41 in the table below. As seen in the table above there are a wide variety of useful cosmogenic nuclides which ...

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

A coronary CT calcium scan is a computed tomography (CT) scan of the heart for the assessment of severity of coronary artery ... Appropriate radioisotopes of elements within chemical compounds of the metabolic pathway being examined are used to make the ... A typical coronary CT calcium scan is done without the use of radiocontrast, but it can possibly be done from contrast-enhanced ... "Heart scan (coronary calcium scan)". Mayo Clinic. Retrieved 9 August 2015. Neves, Priscilla Ornellas; Andrade, Joalbo; Monção, ...

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

Strontium belongs to the same periodic family as calcium (alkaline earth metals), and is metabolised in a similar fashion. 89Sr ... It is an artificial radioisotope which is used in treatment of bone cancer. In circumstances where cancer patients have ... Pecher, Charles (1942). Biological investigations with radioactive calcium and strontium; preliminary report on the use of ... Pecher, Charles (1941). "Biological Investigations with Radioactive Calcium and Strontium". Proceedings of the Society for ...

https://en.wikipedia.org/wiki/Strontium-89

... such as calcium 45, in major nutrient problems and autoradiography (40 min). PMF 5147C (1952) - The Radioisotope - Part XIII: ... The Radioisotope, Parts ?? - XIII PMF 5147A (195?) - The Radioisotope - Part ?? PMF 5147B (1952) - The Radioisotope - Part XII ... beta-emitting radioisotope, such as phosphorus 32, in large-scale field tests of fertilizers, (2) the use of radioisotopes such ... The Radioisotope, Parts I - VI PMF 5145A (1951) - The Radioisotope - Part I: Fundamentals of Radioactivity; This introduction ...

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

73 mentally disabled children were fed oatmeal containing radioactive calcium and other radioisotopes, in order to track "how ... The bones were cremated and the ashes analyzed for radioisotopes. This project was kept secret primarily because it would be a ... The mixtures contained radioactive iron and the researchers were determining how fast the radioisotope crossed into the ... which keeps the remains of people who died with radioisotopes in their body. Three patients at Billings Hospital at the ...

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

... calcium radioisotopes MeSH D01.496.123.328 - carbon radioisotopes MeSH D01.496.156.300 - cerium radioisotopes MeSH D01.496. ... bromine radioisotopes MeSH D01.496.749.108 - cadmium radioisotopes MeSH D01.496.749.113 - calcium radioisotopes MeSH D01.496. ... iron radioisotopes MeSH D01.496.749.540 - krypton radioisotopes MeSH D01.496.749.560 - lead radioisotopes MeSH D01.496.749.590 ... xenon radioisotopes MeSH D01.496.749.960 - yttrium radioisotopes MeSH D01.496.749.980 - zinc radioisotopes MeSH D01.496.807.800 ...

https://en.wikipedia.org/wiki/List_of_MeSH_codes_(D01)

Blackwell (1962) Calcium and phosphorus metabolism in man and animals with special reference to pregnancy and lactation. ... Chicago U.P. (1st ed 1955; 3rd ed 1968 ISBN 0-226-56073-2) Radioisotopes and bone : a symposium organized by the Council for ...

https://en.wikipedia.org/wiki/Franklin_C._McLean

Beryllium-7, beryllium-10, and calcium-41 are trace radioisotopes; calcium-48 and barium-130 have very long half-lives and thus ... Calcium-48 is the lightest nuclide to undergo double beta decay.[21] Calcium and barium are weakly radioactive: calcium ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Of the six alkaline earth metals, beryllium, calcium, barium, and radium have at least one naturally occurring radioisotope; ...

https://en.wikipedia.org/wiki/Alkaline-earth_metal

Calcium carbonate is decomposed, producing carbon dioxide and calcium oxide. Water and carbon dioxide penetrate the corium mass ... An eventually present layer of more dense molten metal, containing fewer radioisotopes (Ru, Tc, Pd, etc., initially composed of ... The calcium oxide, silica, and silicates melt and are mixed into the corium. The oxide phase, in which the nonvolatile fission ... mainly a calcium aluminosilicate with small amount of magnesium oxide, sodium oxide, and zirconium dioxide metal, present as ...

https://en.wikipedia.org/wiki/Corium_(nuclear_reactor)

Of the 10 radioisotopes of beryllium, the most stable are 10 Be with a half-life of 1.39 million years and 7 Be with a half- ... and in elements with even atomic number up to calcium) is prevented in beryllium by the extreme instability of 8 Be toward ... All other radioisotopes have half-lives under 15 seconds, most under 0.03 seconds. The least stable isotope is 16 Be , with a ... These two radioisotopes of beryllium in the atmosphere track the sun spot cycle and solar activity, since this affects the ...

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

Apart from the practically stable 48Ca, the longest lived radioisotope of calcium is 41Ca. It decays by electron capture to ... For example, calcium and phosphorus are supplemented in foods through the addition of calcium lactate, calcium diphosphate, and ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... All four dihalides of calcium are known.[14] Calcium carbonate (CaCO3) and calcium sulfate (CaSO4) are particularly abundant ...

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

Many of the L chondrite meteors may have their origin in the Ordovician meteor event, radioisotope dated with uranium-lead at ... Chromite, sodium-rich feldspar and calcium phosphates occur in minor amounts. Petrologic type 6 dominates, with over 60% of the ...

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

This paper also reports details of the effect of potassium, ammonium and calcium ions on the uptake of the radioisotopes. ... Some of these radioisotopes are tritium, carbon-14 and phosphorus-32. Here is a list of radioisotopes formed by the action of ... This radioisotope can be released from the nuclear fuel cycle; this is the radioisotope responsible for the majority of the ... In addition some natural radioisotopes are present. A recent paper reports the levels of long-lived radioisotopes in the ...

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

The most stable artificial radioisotopes are 45Ca with a half-life of 163 days and 47Ca with a half-life of 4.5 days. All other ... 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 ... Calcium. ed. A. Jorgenson and C. Cleveland. Encyclopedia of Earth, National Council for Science and the Environment, Washington ...

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

Beryllium-7, beryllium-10, and calcium-41 are trace radioisotopes; calcium-48 and barium-130 have very long half-lives and thus ... Calcium-48 is the lightest nuclide to undergo double beta decay. Calcium and barium are weakly radioactive: calcium contains ... Calcium as a material has been known since at least the first century, as the ancient Romans were known to have used calcium ... Of the six alkaline earth metals, beryllium, calcium, barium, and radium have at least one naturally occurring radioisotope; ...

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

Silicon-32 Phosphorus-32 Sulfur-35 Sulfur-38 Chlorine-34m Chlorine-36 Chlorine-38 Chlorine-39 Argon-39 Argon-42 Calcium-41 Iron ... A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e. extremely small). Generally speaking, trace ... Trace radioisotopes are therefore present only because they are continually produced on Earth by natural processes. Natural ... radioisotopes have half-lives that are short in comparison with the age of the Earth, since primordial nuclides tend to occur ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... About 20 radioisotopes and 7 nuclear isomers between 233Cm and 252Cm are known for curium, and no stable isotopes. The longest ... Thus, bombardment of 248Cm with neon (22Ne), magnesium (26Mg), or calcium (48Ca) yielded certain isotopes of seaborgium (265Sg ... They predominantly emit α-particles, and the heat released in this process can serve as a heat source in radioisotope ...

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

Apart from the practically stable 48Ca, the longest lived radioisotope of calcium is 41Ca. It decays by electron capture to ... Other calcium preparations include calcium carbonate, calcium citrate malate, and calcium gluconate.[5] The intestine absorbs ... For example, calcium and phosphorus are supplemented in foods through the addition of calcium lactate, calcium diphosphate, and ... Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ...

https://en.m.wikipedia.org/wiki/Calcium

... 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 ... Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ... 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 ...

https://en.wikipedia.org/wiki/X-ray_imaging

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Radioisotopes of caesium require special precautions: the improper handling of caesium-137 gamma ray sources can lead to ... Similar solutions are formed by the heavy divalent alkaline earth metals calcium, strontium, barium, as well as the divalent ... All of the alkali metals except lithium and caesium have at least one naturally occurring radioisotope: sodium-22 and sodium-24 ...

https://en.m.wikipedia.org/wiki/Alkali_metal

Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... 27 radioisotopes have been observed, with the most stable ones being 169Yb with a half-life of 32.0 days, 175Yb with a half- ... shows the same structure as calcium oxide (CaO).[8] ...

https://en.m.wikipedia.org/wiki/Ytterbium

Calcium 1808 H. Davy 1808 H. Davy Davy discovered the metal by electrolysis of quicklime.[76] ... Marinsky, J. A.; Glendenin, L. E.; Coryell, C. D. (1947). "The chemical identification of radioisotopes of neodymium and of ... 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 ...

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

Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ...

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

... cadmium Calamine Calcite Calcium Calcium carbonate Calcium oxide Californium calomel Calorimeter Canfieldite Carbohydrate ... radioisotope Radium Radon Radon fluoride Raman spectroscopy Raoult's law Redox Reduction Reflux Reversible reaction Rhazes ... Svante Arrhenius Syenite Sylvite synthetic radioisotope systematic element name Tabun Talc Talcum Tantalite Tantalum Tanzanite ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... While most of germanium's radioisotopes decay by beta decay, 61. Ge. and 64. Ge. decay by β+. delayed proton emission.[46] 84. ... At least 27 radioisotopes have also been synthesized, ranging in atomic mass from 58 to 89. The most stable of these is 68. Ge ...

https://en.m.wikipedia.org/wiki/Germanium

Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ...

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

Coronary CT calcium scan. *Computed tomography of the abdomen and pelvis *Virtual colonoscopy ... Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ...

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

... by way of a process which is known as phytoremediation-the process of clearing radioisotopes and a variety of other toxins from ...

https://en.m.wikipedia.org/wiki/Hemp

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Fourteen radioisotopes have been characterized. The most stable are 15O with a half-life of 122.24 seconds and 14O with a half- ... 3, in hematite and rust), and calcium carbonate (in limestone). The rest of the Earth's crust is also made of oxygen compounds ... Manganese is an important cofactor, and calcium and chloride are also required for the reaction to occur. (Raven 2005) ...

https://fa.wikipedia.org/wiki/اکسیژن?match=en

Radioisotope rocket. 7 - 8[citation needed]. 1.3 - 1.5. Months. ? 4: Component validated in lab ... or leaching of calcium from their bones. ...

https://en.m.wikipedia.org/wiki/Spacecraft_propulsion

Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ...

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

"calcium manganese oxide Ca2Mn3O8". International Union of Crystallography. Retrieved 11 August 2015.. ... Many space probes, including the Mars Curiosity rover, generate electricity using a radioisotope thermoelectric generator whose ... More recent devices use highly doped semiconductors made from bismuth telluride (Bi2Te3), lead telluride (PbTe),[11] calcium ... Another application is radioisotope thermoelectric generators which are used in space probes, which has the same mechanism but ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Thirty radioisotopes have been characterised, which range in mass number from 209[22] to 238.[20] After 232Th, the most stable ... involving the reduction of thorium oxide with calcium in presence of calcium chloride.[94] ... Uranium-thorium dating is commonly used to determine the age of calcium carbonate materials such as speleothem or coral, ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... Twenty-eight radioisotopes have been characterized, the most stable being 105Ag with a half-life of 41.29 days, 111Ag with a ...

https://en.wikipedia.org/wiki/E174

Calcium-sensitive agents make MRI more sensitive to calcium concentrations, with calcium ions often being the messengers for ... Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone scintigraphy. * ... This glutamate affects nearby supporting cells, astrocytes, causing a change in calcium ion concentration. This, in turn, ... Other biomarkers now looked at to provide better contrast include temperature, acidity/alkalinity (pH), calcium-sensitive ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... 19 radioisotopes have been characterized, with the most stable being 50Cr with a half-life of (more than) 1.8×1017 years, and ... The chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is ...

https://en.m.wikipedia.org/wiki/Chromium

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... 204Tl is the most stable radioisotope, with a half-life of 3.78 years.[12] It is made by the neutron activation of stable ... The radioisotope thallium-201 (as the soluble chloride TlCl) is used in small, nontoxic amounts as an agent in a nuclear ... "Manual for reactor produced radioisotopes" (PDF). International Atomic Energy Agency. 2003. Retrieved 2010-05-13.. ...

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

Radium and strontium mimic calcium in the body. Samarium is bound to tetraphosphate EDTMP, phosphates are taken up by ... Generator Performance and Evolving Therapeutic Applications of Two Generator-Derived Alpha-Emitting Radioisotopes". Current ...

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

Several different radioisotopes can be produced with very different half-lives; the concentration of each may be regarded as ... The intensities of certain solar and stellar lines generated in the chromosphere, particularly the lines of ionised calcium (Ca ...

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

2013). «182Hf-182W age dating of a 26Al-poor inclusion and implications for the origin of short-lived radioisotopes in the ... Amelin, Y.; Krot, A.; Hutcheon, I.; Ulyanov, A. (2002). «Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions ...

https://no.wikipedia.org/wiki/Solen

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... is also sometimes considered as a light radioisotope of hydrogen, due to the mass difference between the antimuon and the ...

https://en.wikipedia.org/wiki/E949

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... The longest-lived radioisotopes are thulium-171, which has a half-life of 1.92 years, and thulium-170, which has a half-life of ... The metal can be isolated through reduction of its oxide with lanthanum metal or by calcium reduction in a closed container. ... The blue fluorescence of Tm-doped calcium sulfate has been used in personal dosimeters for visual monitoring of radiation.[4] ...

https://en.m.wikipedia.org/wiki/Thulium

Main article: Radioisotope renography. Full body[edit]. Examples are gallium scans, indium white blood cell scans, iobenguane ... Certain tests, such as the Schilling test and urea breath test, use radioisotopes but are not used to produce a specific image ... where radioisotopes attached to drugs that travel to a specific organ or tissue (radiopharmaceuticals) are taken internally and ...

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

Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine ... allowing the use of radioisotope rubidium-82 in nuclear medicine to locate and image brain tumors.[50] Rubidium-82 has a very ...

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

As the radioisotope undergoes positron emission decay (also known as positive beta decay), it emits a positron, an antiparticle ... Coronary CT calcium scan. *Computed tomography of the abdomen and pelvis *Virtual colonoscopy ... BROWNELL G.L., Dave Marcum, B. HOOP JR., and D.E. BOHNING, "Quantitative dynamic studies using short-lived radioisotopes and ... Due to the short half-lives of most positron-emitting radioisotopes, the radiotracers have traditionally been produced using a ...

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

The high amount of calcium (Z = 20) in bones, together with their high density, is what makes them show up so clearly on ... Bones contain a high concentration of calcium, which, due to its relatively high atomic number, absorbs x-rays efficiently. ... finding that calcium tungstate was the most effective substance. In May 1896 he developed the first mass-produced live imaging ... using a calcium tungstate screen developed by Edison, found that using a fluorescent screen decreased the exposure time it took ...

https://en.wikipedia.org/wiki/X-rays

Calcium and Vitamin Supplements Radioisotope Scan Osteoporosis Diet for Kidney stones Death Facts Heart Healthy Heart ... Calcium and Vitamin Supplements. Calcium and vitamin supplements are taken to provide the body with the required nutrients ... CAC uses a CT scan to detect calcium build-up in the arteries of the heart. According to Bowden, the cost of the test is ... Radioisotope Scan Encyclopedia section of medindia gives general info about Nuclear Medicine ...

http://www.medindia.net/news/heart-calcium-scan-predictive-of-diabetes-related-death-from-cardiovascular-disease-study-111936-1.htm

A simple CT imaging technique called a coronary artery calcium scan may be particularly useful when screening for coronary ... Calcium and Vitamin Supplements Radioisotope Scan Osteoporosis Diet for Kidney stones Heart Healthy Heart Statins Mitral Valve ... Coronary Artery Calcium Score. Coronary calcium builds up at the site of coronary plaque, so a CAC scan can be effective in ... Calcium and Vitamin Supplements. Calcium and vitamin supplements are taken to provide the body with the required nutrients ...

http://www.medindia.net/news/healthwatch/coronary-artery-calcium-scan-a-useful-tool-to-screen-heart-disease-168394-1.htm

... rapidly potentiates N and L calcium channel currents in cerebellar granule neurons by an unknown mechanism. Here, we show that ... Calcium Channel Agonists * Calcium Channels, L-Type * Nerve Tissue Proteins * Phosphorus Radioisotopes ... Insulin-like growth factor 1 (IGF-1) rapidly potentiates N and L calcium channel currents in cerebellar granule neurons by an ... Potentiation of neuronal L calcium channels by IGF-1 requires phosphorylation of the alpha1 subunit on a specific tyrosine ...

https://pubmed.ncbi.nlm.nih.gov/10939336/?dopt=Abstract

Equilbrium calcium binding was specific, concentration dependent and saturable. Scatchard analysis indicated the existence of ... Preliminary characterization of calcium binding was determined in a highly-enriched islet-cell plasma membrane fraction using a ... Calcium Radioisotopes * Insulin * Calcium Grant support * AM05398/AM/NIADDK NIH HHS/United States ... Preliminary characterization of calcium binding in islet-cell plasma membranes Diabetologia. 1980 Nov;19(5):439-44. doi: ...

https://pubmed.ncbi.nlm.nih.gov/7004962/?dopt=Abstract

Administration, Oral; Adsorption; Animals; Calcium; Cesium Radioisotopes; Lanthanum; Male; Mice; Mice, Inbred Strains; Phytic ...

https://www.americanelements.com/research/complexes-of-myo-inositol-hexakisphosphate-ip6-with-zinc-or-lanthanum-for-the-decorporation-of

The measurement of intestinal calcium absorption by external radioisotope counting: application to study of nephrolithiasis. ... The measurement of intestinal calcium absorption by external radioisotope counting : application to study of nephrolithiasis. ... T1 - The measurement of intestinal calcium absorption by external radioisotope counting. T2 - application to study of ... The measurement of intestinal calcium absorption by external radioisotope counting: application to study of nephrolithiasis. ...

https://utsouthwestern.pure.elsevier.com/en/publications/the-measurement-of-intestinal-calcium-absorption-by-external-radi

Strontium; Metal compounds; Calcium; Bone structure; Radioisotopes; X-ray fluorescence analysis; Humans; Children; In vivo ... Previous technology uses radioisotope sources and bulky equipment to measure bone Sr. This study demonstrates the effectiveness ...

http://www2a.cdc.gov/nioshtic-2/BuildQyr.asp?s1=%27child%2A%27&t3=1&f1=TI&Startyear=&t1=1&s2=youth+or+young&B1=Search&terms=4&Adv=1&f2=TI&t2=1&Limit=500&Sort=DP+DESC&s3=%27adolescent%2A%27&f3=%2A&s4=%27child%2A%27&EndYear=&f4=KW&D1=10&PageNo=41&RecNo=402&View=f&

... use of radioisotopes to assess intestinal flux of calcium in humans; and calcium and structure of cell membranes. The ... Basis of Action of Hormones on Calcium Absorption Effects of pH and Counter-ion on Absorption of Metal Ions Vascular Factors in ... The Intestinal Absorption of Calcium Absorption of Iron and Chemically Related Metals in Vitro and in Vivo Intestinal ... The book takes a look at the intestinal absorption of sodium, calcium, and potassium, including sodium and potassium transport ...

https://www.elsevier.com/books/intestinal-absorption-of-metal-ions-trace-elements-and-radionuclides/skoryna/978-0-08-015721-4

used in radioisotope thermoelectric generators (RTGs) and radioisotope heater units as an energy source for spacecraft ... Calcium-41 20. 21. 102,000 y. EC. Cosmogenic. exposure dating of carbonate rocks ... "Radioisotopes in Industry". World Nuclear Association.. *. Martin, James (2006). Physics for Radiation Protection: A Handbook. ... most commonly used medical radioisotope, used as a radioactive tracer Iodine-129 53. 76. 15,700,000 y. β−. 194 Cosmogenic. ...

https://en.m.wikipedia.org/wiki/Radioisotope

Many other calcium radioisotopes are known, ranging from 35Ca to 60Ca. They are all much shorter-lived than 41Ca, the most ... Other calcium preparations include calcium carbonate, calcium citrate malate, and calcium gluconate. The intestine absorbs ... For example, calcium and phosphorus are supplemented in foods through the addition of calcium lactate, calcium diphosphate, and ... All four dihalides of calcium are known. Calcium carbonate (CaCO3) and calcium sulfate (CaSO4) are particularly abundant ...

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

... is a type of arthritis caused by the deposition of calcium pyrophosphate crystals. Clinical Image Atlas : View clinical images ... Extraosseous calcific deposits may also take up the radioisotope.. Nuclear imaging procedures are highly sensitive; however, ... Calcium pyrophosphate deposition disease (CPDD) is a type of arthritis caused by the deposition of calcium pyrophosphate ... Primary calcium pyrophosphate deposition disease. Calcium pyrophosphate deposition disease (CPDD) is divided into several ...

https://emedicine.medscape.com/article/388348-overview

Tens of millions of nuclear medicine procedures are performed each year, and demand for radioisotopes is increasing rapidly ... the use of radioisotopes for diagnostics, radiation therapy, radiopharmaceuticals and other beneficial medical uses of nuclear ... It is produced by irradiating calcium-46 to produce Ca-47 which decays to Sc-47. ... The global radioisotope market was valued at $9.6 billion in 2016, with medical radioisotopes accounting for about 80% of this ...

https://world-nuclear.org/information-library/non-power-nuclear-applications/radioisotopes-research/radioisotopes-in-medicine.aspx

Results for argon-39 from the reaction potassium-39 (n,p), and for argon-37, from the reaction calcium-40 (n,a), seem to ... A striking similarity for contents of seven elements in lunar metal and metal from the calcium-rich achondrite Juvinas was ... Major and Trace Elements and Cosmic-Ray Produced Radioisotopes in Lunar Samples ... Major and Trace Elements and Cosmic-Ray Produced Radioisotopes in Lunar Samples ...

http://science.sciencemag.org/content/167/3918/523

Cells were washed until the supernatant did not contain radioisotope (five washes). Pellets were then resuspended in 0.5 ml of ... Calcium Carbonate Precipitation.. After ≈2 weeks in culture, calcium carbonate-like particles, ranging in size from 20 to 100 ... For example, both calcium carbonate precipitation in coral skeleton and calcium phosphate precipitation in bone result from ... which facilitates controlled deposition of a calcium carbonate skeleton; and (iii) the calcium carbonate skeleton itself, which ...

http://www.pnas.org/content/105/1/54

AC3 plant absorbs a carbon radioisotope (as part of 14CO2). In which compound does the labeled carbon appear fi... ... What is the mass percent of phosphorus in calcium phosphate? Use this value to calculate the mass of calcium phosphate (in ... What is the mass percent of phosphorus in calcium phosphate? Use this value to calculate the mass of calcium phosphate (in ... What is the mass percent of phosphorus in calcium phosphate? Use this value to calculate the mass of calcium phosphate (in ...

https://www.bartleby.com/solution-answer/chapter-2-problem-138gq-chemistry-and-chemical-reactivity-10th-edition/9781337399074/elemental-phosphorus-is-made-by-heating-calcium-phosphate-with-carbon-and-sand-in-an-electric/14491566-a2ca-11e8-9bb5-0ece094302b6

1980) Radioisotope imaging in osseous sarcoidosis. Am J Roentgenol 134:189-191, . ... Acute hypercalcaemia may result in renal tubule necrosis from intracellular calcium overload and tubule obstruction by calcium ... 18 Hypercalcaemia varies directly with calcium intake52 53 and can be prevented or corrected by dietary restriction of calcium ... 1905) Calcium levels. in Sarcoidosis and other granulomatous disorders. eds James DG, Jones Williams W (Saunders, Philadelphia ...

https://thorax.bmj.com/content/53/5/425

Serum calcium and magnesium above the institutional lower limit of normal (within 14 days of registration and within 7 days of ... Creatinine clearance or radioisotope glomerular filtration rate (GFR) ,= 70 ml/min/1.73m^2 or a serum creatinine based on age ...

https://clinicaltrials.gov/ct2/show/NCT01089101

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

The radioisotope is administered intravenously and localizes, like calcium, in th ... The radioisotope is administered intravenously and localizes, like calcium, in the myocardium (heart muscle). ... A scintillation camera produces an image of the distribution of the radioisotope. Areas of inadequate perfusion (blood flow) ... This is a scintillation scan (gamma camera or photoscan) involving the use of thallium-201, a radioisotope. ...

https://www.healthcentral.com/encyclopedia/thallium-stress-test

Radium-223 dichloride is an alpha-particle emitting radio isotope. The drug mimics calcium and forms complexes with the bone ... are some radionuclides that are bone seeking radioisotopes and those radionuclides exhibit chemical behavior similar to calcium ... Once in the bone, the radioisotope emits beta or alpha particles, which kill the nearby cancer cells. ...

http://chemocare.com/chemotherapy/drug-info/radium-223-dichloride.aspx

1Radioisotopes Division, MRC Clinical Research Centre, Harrow, Middlesex, U.K.. Search for other works by this author on: This ... The Relationship between Trends in Cortical Bone Density and Calcium Balance in Patients with Involutional Osteoporosis R. Hesp ... Trends in Trabecular and Cortical Bone in the Radius Compared with Whole Body Calcium Balance in Osteoporosis Clin Sci (Lond) ( ... R. Hesp, J. Reeve; The Relationship between Trends in Cortical Bone Density and Calcium Balance in Patients with Involutional ...

https://portlandpress.com/clinsci/article-abstract/57/3/22P/74586/The-Relationship-between-Trends-in-Cortical-Bone

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

Once in the body, Sr-90 acts like calcium and is readily incorporated into bones and teeth, where it can cause cancers of the ...

https://www.cdc.gov/nceh/radiation/emergencies/isotopes/strontium.htm

An antacid tablet weighing 0.853 g contained calcium carbonate as the active ingredient, in addition to an iner... ... Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. ... ...

https://www.bartleby.com/solution-answer/chapter-18-problem-98ap-introductory-chemistry-a-foundation-9th-edition/9781337399425/in-each-of-the-following-reactions-identify-which-element-is-oxidized-and-which-is-reduced-by/de3bfaf5-252f-11e9-8385-02ee952b546e

Multi-mode Handheld Radioisotope Identification Instrument SBC: Endectra LLC Topic: DTRA152007 Handheld radioisotope ... Laser Sensor for Unattended, and Precise Determination of Calcium and Strontium in Seawater SBC: CHEMLED TECHNOLOGIES, LLC ... Radioisotopes can be identified by the emission of neutrons & gammas having characteristic energies.Most hand-held radioisotope ... Multi-mode Handheld Radioisotope Identification Instrument SBC: Merrill Corporation, dba Mission Support Topic: DTRA152007 ...

https://www.sbir.gov/sbirsearch/award/all/?f%5B0%5D=im_field_agencies%3A105743&f%5B1%5D=im_field_state%3A105811&f%5B2%5D=im_field_state%3A105855&f%5B3%5D=im_field_state%3A105830&f%5B4%5D=im_field_agencies%3A105750&%3Bf%5B1%5D=im_field_state%3A105821&%3Bamp%3Bf%5B1%5D=im_field_agencies%3A105736&%3Bamp%3Bf%5B2%5D=im_field_agencies%3A105761&%3Bamp%3Bf%5B3%5D=im_field_agencies%3A105733

Calcium Bisphosphonate Nanoparticles with Chelator-Free Radiolabeling to Deplete Tumor-Associated Macrophages for Enhanced ... Ultrasmall Hyperbranched Semiconducting Polymer Nanoparticles with Different Radioisotopes Labeling for Cancer Theranostics. ...

https://www.ncbi.nlm.nih.gov/pubmed?cmd=search&term=Yi+X%5Bau%5D&dispmax=50

... calcium, barium, scandium, titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, yttrium,zirconium, indium, ... When longer lived radioisotopes are employed, resins are used which are more radiation resistant. Such materials are known to ... Radioisotope-containing microspheres. US3663685 *. Apr 1, 1968. May 16, 1972. Minnesota Mining & Mfg. Biodegradable radioactive ... Particularly useful radioisotopes are the short-lived isotopes such as yttrium-90, ytterbium-169, scandium-46, chromium-51 and ...

http://www.google.com/patents/US3334050?dq=4,923,986

Whereas strontium is very similar to calcium and calcium is in a form that is very available to plants - we dont have that ... Those radioisotopes mimic some of the nutrients that the plant takes up normally. And so the plant really doesnt distinguish ... between those radioactive isotopes and some of the nutrients like potassium and calcium that it takes up as a matter of course. ...

https://www.loe.org/shows/shows.html?programID=11-P13-00030

Doses of soluble corn fiber may boost calcium retention for postmenopausal women by up to 7%, says a new study from Purdue ... Bone calcium retention was measured using urinary levels of the rare radioisotope 41Ca. "41Ca is a virtually stable, long-lived ... Algae-derived calcium positively builds bone in older people: Study * GOS prebiotics may boost calcium absorption for teens: ... C]hronic doses of 10 and 20 g fiber from SCF/d were well tolerated by participants and increased bone-calcium retention in free ...

https://www.nutraingredients-usa.com/Article/2016/08/01/Soluble-corn-fiber-shows-bone-health-benefits-for-older-women

HAPS Objective: C01.02 Compare and contrast the terms ions, electrolytes, free radicals, isotopes and radioisotopes. HAPS Topic ... The four most common elements in the body are hydrogen, carbon, calcium, and oxygen. FALSE ... isotopes and radioisotopes. HAPS Topic: Module C01 Atoms and molecules. Learning Outcome: 02.02 Section: 02.02 Topic: Atoms and ... isotopes and radioisotopes. HAPS Objective: Q03.01 Define electrolyte. HAPS Topic: Module C01 Atoms and molecules. HAPS Topic: ...

https://issuu.com/a120575776/docs/vanders-human-physiology-the-mechan_1295d089a4b715

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)
As a result, comparisons with strontium and barium are more germane to calcium chemistry than comparisons with magnesium. (wikipedia.org)
Its optical properties are intermediate to calcium fluoride and barium fluoride. (wikipedia.org)
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)
The Group 2 alkaline earth metals include Beryllium, Magnesium, Calcium, Barium, Strontium and Radium and are soft, silver metals that are less metallic in character than the Group 1 â ¦ The is used in the manufacturing of aircraft, car engines and missile construction. (euroshoe.com)
78], The chemistry of element 120 is predicted to be closer to that of calcium or strontium[79] instead of barium or radium. (euroshoe.com)
Tell your doctor and the technologist if there is a possibility you are pregnant or if you recently had a barium exam or received an injection of contrast material for a CT or radioisotope scan. (radiologyinfo.org)
Inform your physician if you recently had a barium examination or have been injected with a contrast material for a computed tomography (CT) scan or radioisotope scan . (radiologyinfo.org)

HAPS Objective: C01.02 Compare and contrast the terms ions, electrolytes, free radicals, isotopes and radioisotopes. (issuu.com)
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)
Traditionally, the radioactive isotopes used to treat bone metastasis from prostate cancer have been primarily beta emitting radioisotopes. (pcri.org)
Geochemists measure the ages of rocks by measuring the abundance of radioactive isotopes - versions of the same element that have different atomic masses - in parts of meteorites called calcium-aluminum-rich inclusions. (wired.com)
Radioactive tracers have many advantages over other tracers, which include the identity of chemical and physical properties of all isotopes of a given element, the emission of radiation is a specific property of the tracer which is not affected by interference from other materials in the system, radioisotopes are measurable with high sensitivity and therefore detectable in very low concentration and the measurement in situ is possible. (thefreedictionary.com)

For example, calcium spontaneously reacts with water more quickly than magnesium and less quickly than strontium to produce calcium hydroxide and hydrogen gas. (wikipedia.org)
Calcium/magnesium The New England Journal of Medicine reported that calcium may prevent precancerous cells from becoming cancerous. (safespaceprotection.com)

Some calcium compounds were known to the ancients, though their chemistry was unknown until the seventeenth century. (wikipedia.org)
Calcium compounds are widely used in many industries: in foods and pharmaceuticals for calcium supplementation, in the paper industry as bleaches, as components in cement and electrical insulators, and in the manufacture of soaps. (wikipedia.org)
Hence, calcium is almost always divalent in its compounds, which are usually ionic. (wikipedia.org)
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)

Calcium ions outside cells are important for maintaining the potential difference across excitable cell membranes, protein synthesis, and bone formation. (wikipedia.org)
Up to 30 percent by weight of radioisotope ions can be incorporated into the particles. (google.com)
Calcium ions (Ca 2+ ) play a pivotal role in the physiology and biochemistry of organisms and the cell . (wn.com)
Many enzymes require calcium ions as a cofactor, those of the blood-clotting cascade being notable examples. (wn.com)
Calcium ions , Ca 2+ , are released from bone into the bloodstream under controlled conditions. (wn.com)
Calcium is transported through the bloodstream as dissolved ions or bound to proteins such as serum albumin . (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)

This insight informed a candidate gene approach which led to the identification of plant like calcium dependent protein kinase (CDPK) involved in egress 9 . (jove.com)

By using this system, we examined the production of ECM, SOM, and calcium carbonate particles, which are the fundamental components that form the structure of the coral colony in nature. (pnas.org)
Extracellular production of organic matrices and calcium carbonate particles was examined in primary, nondividing cell cultures of the soft coral Xenia elongata and the stony coral Montipora digitata . (pnas.org)
In circumstances where cancer patients have widespread and painful bony metastases , the administration of 89 Sr results in the delivery of beta particles directly to the area of bony problem, where calcium turnover is greatest. (wikipedia.org)
It is an object of this invention to prepare radioactive particles consisting of carbonaceous matrices having firmly bound radioisotopes dispersed therein. (google.com)
Strontium-89 ( 89 Sr) is a radiopharmaceutical which accumulates in bone metastases showing increased calcium metabolism, emits β particles, and is used for palliative treatment for bone pain. (go.jp)
Radium is commonly determined in environmental samples by the emission of alpha particles from the radium-226 radioisotope. (cdc.gov)
Scientists create artificial radioisotopes by bombarding stable atoms of an element with subatomic particles in a nuclear reactor or in an atom smasher, or cyclotron. (thefreedictionary.com)

According to researchers at Wake Forest Baptist Medical Center, the best way for doctors to predict which diabetes patients are at the greatest risk for heart disease is to use a coronary artery calcium (CAC) test in addition to the most commonly used assessment tool. (medindia.net)
Could Coronary Artery Calcium Scan Be Useful In Screening Heart Disease? (medindia.net)
Coronary calcium builds up at the site of coronary plaque, so a coronary artery calcium scan can be effective in detecting plaques. (medindia.net)
Coronary artery calcium scan often referred to as a calcium scan may be particularly useful when screening for coronary artery disease. (medindia.net)
Coronary calcium builds up at the site of coronary plaque, so a coronary artery calcium (CAC) scan often referred to as a "calcium scan" can be effective in detecting even minute amounts of CAC. (medindia.net)
According to a review published in JACC: Cardiovascular Imaging, a simple CT imaging technique called a coronary artery calcium (CAC) scan--often referred to as a "calcium scan"--may be particularly useful when screening for coronary artery disease. (medindia.net)

Elemental phosphorus is made by heating calcium phosphate with carbon and sand in an electric furnace. (bartleby.com)
What is the mass percent of phosphorus in calcium phosphate? (bartleby.com)
Use this value to calculate the mass of calcium phosphate (in kilograms) that must be used to produce 15.0 kg of phosphorus. (bartleby.com)
an impure calcium phosphate mineral found in phosphate rocks. (thefreedictionary.com)
The effect of casein phosphopeptide-amorphous calcium phosphate on erosive enamel and dentine wear by toothbrush abrasion. (thejcdp.com)
99m Tc-MDP and 99m Tc-HMDP are complexes of 99m Tc with bisphosphonate analogs having high affinity for bone since the phosphate groups in the bisphosphonate can be coordinated with calcium in hydroxyapatite crystals in bone. (nature.com)

As 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)
It also reacts with the oxygen and nitrogen in the air to form a mixture of calcium oxide and calcium nitride. (wikipedia.org)
Calcium Cobalt Oxide (CCO) is a p-type semiconductor obtained by heating calcium carbonate (CaCO 3 ) and cobalt oxide (Co 3 O 4 ) to form a misfit-layered crystalline structure with composition [(Ca 2 CoO 3 )(CoO 2 )] 1.61 . (americanelements.com)
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)
Group 2 elements are called alkaline metals because they form Calcium oxide reacts with carbon to form acetylide. (euroshoe.com)

Some radioisotopes* are used in ionic or inert form without attachment to a pharmaceutical, these are also included. (wikipedia.org)
Inhibition of hydroxyapatite dissolution by whole casein: the effects of pH, protein concentration, calcium, and ionic strength. (thejcdp.com)

Previous technology uses radioisotope sources and bulky equipment to measure bone Sr. This study demonstrates the effectiveness of portable X-ray fluorescence (XRF) for bone Sr measurement and validates it using data from a population of 238 child ren. (cdc.gov)
The laboratory includes a basic cell culture facility, a fluorescence microscope room, instrumentation for 2D electrophoresis and for horizontal and vertical lectrophoresis using agarose and SDS PAGE gels, northern and western blotting, an ultracentrifuge for cell fractionation, a spectrophotometer, and the necessary instrumentation to do radioisotope measurements. (gatech.edu)
Proton and calcium transport activities in the fraction were characterized by fluorescence microscopy and spectrophotometric methods using acridine orange and arsenazo III, respectively. (jove.com)

It is a silvery metallic element that must be extracted by electrolysis from a fused salt like calcium chloride . (wn.com)
were highly variable due to soil conditions, such as moisture status, accompanied chloride and calcium addition. (go.jp)

A radionuclide ( radioactive nuclide , radioisotope or radioactive isotope ) is an atom that has excess nuclear energy, making it unstable. (wikipedia.org)

Another use is as a carrier of strontium-90 radioisotope in radioisotope thermoelectric generators. (wikipedia.org)
It also protects against strontium 90 (similar structure to calcium) and other radioisotopes. (safespaceprotection.com)

Furthermore, radium associates with calcium in living systems and accumulates in bone. (cdc.gov)

Calcium and phosphorus make up the major bulk of remaining minerals, found mostly in bone. (encyclopedia.com)

Results for argon-39 from the reaction potassium-39 (n,p), and for argon-37, from the reaction calcium-40 (n,a), seem to require a neutron spectrum conitaining more neutrons below 2 million electronvolts than the evaporation spectrum or that given by Arnold, Honda, and Lal (1) or a strong time dependence for the neutron flux. (sciencemag.org)
If your body lacks calcium, potassium and other nutrients, it will more readily absorb the radioactive elements that are similar in structure to these nutrients. (safespaceprotection.com)

Calcium is a reactive, soft metal that is a member of the alkaline earth elements. (americanelements.com)
Free calcium metal is too reactive to occur in nature. (wn.com)

There is widespread awareness of the use of radiation and radioisotopes in medicine, particularly for diagnosis (identification) and therapy (treatment) of various medical conditions. (world-nuclear.org)
Radium is determined in both biological and environmental samples by the emission of ionizing radiation from its radioisotopes (alphae- emitting radium-223, radium-224, and radium-226, as well as beta-emitting radium-228) and from its daughter products. (cdc.gov)
X-ray diagnostics (general and dental radiography) and therapies, which make use of radioisotopes in oncology and some other serious diseases, attribute to the primary contribution to the dose absorbed by a person from human-made radiation sources. (reportlinker.com)
Radiation (radioisotope) therapy remains one of the main approaches to fight cancer. (reportlinker.com)
The side effects of treatment, most notably depression of blood counts and anemia, were greater with Samarium-153 and Strontium-89, as beta emitting radioisotopes result in more radiation to the bone marrow compartment of bone- as they deposit energy along a greater pathway than alpha emitters. (pcri.org)
Radium-223, because it is an alpha emitting radioisotope, deposits energy along a shorter pathway and results in lower amounts of radiation to the central bone marrow component of the bone. (pcri.org)
A radioisotope consists of unstable atoms that undergo radioactive decay emitting alpha, beta or gamma radiation. (thefreedictionary.com)

CAC uses a CT scan to detect calcium build-up in the arteries of the heart. (medindia.net)
This is a scintillation scan (gamma camera or photoscan) involving the use of thallium-201, a radioisotope. (healthcentral.com)
Symptoms and signs of this disease, including gastric inhibitory peptide gip, vasopressin, b-adrenoceptor, human chorionic gonadotrophin depends on a radioisotope scan makes malignancy less likely. (norfolkspca.com)

Strontium-89 and Samarium-153 were the two approved radioisotopes used most commonly in treatment of metastatic prostate carcinoma to bone, prior to the approval of radium-223 dichloride. (pcri.org)
Furthermore, radium-223 dichloride mimics calcium and primary concentrates in areas of higher bone turnover, or where areas of bone metastasis reside. (pcri.org)
Radioisotopes occur naturally, as in the cases of radium and uranium, or may be created artificially. (thefreedictionary.com)

Calcium uptake occurs through a Ca(2+)/H(+) countertransporting ATPase located in the membrane of the organelle. (jove.com)
In the study, high specific uptake was obtained in human colon cancer cells transplanted in mice, resulting in very high tumour-to-blood and tumour-to-kidney ratios of radioisotope uptake. (thefreedictionary.com)

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)

While calcium is infeasible as a conductor for most terrestrial applications as it reacts quickly with atmospheric oxygen, its use as such in space has been considered. (wikipedia.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)
in water solutions of acids, where this salt is soluble, calcium reacts vigorously. (wn.com)

Calcium is a chemical element with the symbol Ca and atomic number 20. (wikipedia.org)
Calcium (atomic symbol: Ca, atomic number: 20) is a Block S, Group 2, Period 4 element with an atomic weight of 40.078. (americanelements.com)

The Supercritical/Solid Catalyst (SSC) can handle waste greases with up to 100% free fatty acid (FFA) content, more than 30% water content, and high in impurities such as sulfur, phosphorous, calcium and others. (greencarcongress.com)

The most common radioisotope used in diagnosis is technetium-99 (Tc-99), with some 40 million procedures per year, accounting for about 80% of all nuclear medicine procedures and 85% of diagnostic scans in nuclear medicine worldwide. (world-nuclear.org)
The Accelerator Generation and Thermal Separation (AGATS) is an integrated system for producing technetium-99 and other medical radioisotopes. (greencarcongress.com)
INL researchers developed a method of separating technetium-99 from molybdenum-99 by heating the product to vaporization and condensing the desired radioisotope, free of impurities. (greencarcongress.com)

Patients with primary hyperparathyroidism have elevated levels of blood calcium caused by too much parathyroid hormone released by one or more parathyroid tumors. (clinicaltrials.gov)

prolonged application of nicotine at pharmacologically relevant concentrations produced modest amounts of Ca 2+ -dependent [ 3 H]dopamine release that required neuronal calcium channel activity. (jneurosci.org)

Closure of the human large-conductance, calcium-sensitive k channel blockers modify the m0 and b0 magnetic fields are oriented in one piece. (hyperbaricnurses.org)
Dopamine release was diminished by omitting Na + or by applying peptide calcium channel blockers, indicating that nAChRs trigger release by depolarizing the nerve terminals. (jneurosci.org)

A calcium reactor has less chance of promoting carbonate precipitation in the aquarium's pumps and heaters than a high pH DIY or limewater-based supplementation. (beeldendiejebijblijven.nl)

It has been proposed heretofore to incorporate radioisotopes into the structure of synthetic resins, and articles containing tritium or carbon 14 incorporated into the structure of synthetic resins or plastics have been produced. (google.com)

Hypothetical univalent salts of calcium would be stable with respect to their elements, but not to disproportionation to the divalent salts and calcium metal, because the enthalpy of formation of MX2 is much higher than those of the hypothetical MX. (wikipedia.org)
"41Ca is a virtually stable, long-lived radioisotope ([half life]= 105 y) that can be measured with great sensitivity via accelerator mass spectrometry," explained the researchers. (nutraingredients-usa.com)
The most stable artificial radioisotope is 45 Ca, with a half-life of 163 days. (wn.com)

AC3 plant absorbs a carbon radioisotope (as part of 14CO2). (bartleby.com)
Why did the researchers not look for shorter-lived radioisotopes such as iron 60 ( 60 Fe), nickel 59 ( 59 Ni), manganese 53 ( 53 Mn), krypton 81 ( 81 Kr), calcium 41 ( 41 Ca), carbon 14 ( 14 C), or even yttrium 88 ( 88 Y), which would have produced significantly younger age estimates? (icr.org)

This concept of 'deep time' is firmly based on the uniformitarian view of nature, i.e., that decay rates for radioisotopes have always been as they appear today. (icr.org)
9 It should be noted here that there are ways to accelerate radioisotope decay. (icr.org)

The measurement of intestinal calcium absorption by external radioisotope counting: application to study of nephrolithiasis. (elsevier.com)

The global radioisotope market was valued at $9.6 billion in 2016, with medical radioisotopes accounting for about 80% of this, and it is poised to reach about $17 billion by 2021. (world-nuclear.org)

Refractory inclusions [calcium-aluminum-rich inclusions, (CAIs)] represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. (sigmaaldrich.com)
To test whether the uranium ratio really was constant, Brennecka and colleagues took samples from calcium-aluminum-rich inclusions in the well-studied Allende meteorite and measured how much uranium-235 and uranium-238 they held. (wired.com)

Calcium pyrophosphate deposition disease (CPDD) is a type of arthritis caused by the deposition of calcium pyrophosphate crystals. (medscape.com)
Calcium pyrophosphate deposition disease (CPDD) is divided into several varieties, primarily pseudogout and chondrocalcinosis . (medscape.com)
Periarticular metacarpophalangeal and interphalangeal joint calcification may be a component of that form of calcium pyrophosphate deposition disease (CPDD). (medscape.com)
These cysts are not specific for calcium pyrophosphate deposition disease. (medscape.com)
Pseudorheumatoid calcium pyrophosphate deposition disease (CPDD) has a polyarticular character. (medscape.com)
Crumbling-type erosions of calcium pyrophosphate deposition disease in the metacarpophalangeal and proximal and distal interphalangeal joints. (medscape.com)
The skeletal and clinical distribution pattern of nonerosive components of primary calcium pyrophosphate deposition disease (CPDD) are shown in the table below. (medscape.com)
The variety of calcium pyrophosphate deposition disease (CPDD) is associated with rheumatoid arthritis or spondyloarthropathy . (medscape.com)

Extracellular calcium is also important for maintaining the potential difference across excitable cell membranes , as well as proper bone formation. (wn.com)

Co-60, a commercially important radioisotope, is useful as a radioactive tracer and gamma ray source. (americanelements.com)

Calcium is a mineral found in many foods. (medindia.net)
If the entire effect of SCF is realized within 50 d (i.e., the duration of interventions in the current study), a total of 2.5 g bone calcium or 0.3% of [total-body bone mineral content (TBBMC)] would be retained. (nutraingredients-usa.com)
Calcium levels in mammals are tightly regulated, with bone acting as the major mineral storage site. (wn.com)

To correlate the differential expression of AMPA receptor subunits in each neuron with that of two calcium-binding proteins, parvalbumin and calbindin-D28k, we used a triple-labeling method. (jneurosci.org)
These results indicate that neurons in the rat somatosensory cortex express differential combinations of GluR subunits, which correlate with the specific expression of the calcium-binding proteins. (jneurosci.org)

The chemistry of calcium is that of a typical heavy alkaline earth metal. (wikipedia.org)
Calcium is a soft gray alkaline earth metal , fifth-most-abundant element by mass in the Earth 's crust . (wn.com)

deconvolution analysis calcium absorption strontium (85Sr) whole-body counting Clinical Science (1980) 58,281-293 The relative merits of various techniques for measuring radiocalcium absorption R. WOOTTON A N D J . REEVE Radioisotopes Division, MRC Clinical Research Centre. (portlandpress.com)

Doses of soluble corn fiber may boost calcium retention for postmenopausal women by up to 7%, says a new study from Purdue University and Indiana University. (nutraingredients-usa.com)
Results showed that the 10 and 20 gram per day doses of the soluble corn fiber increased bon calcium retention by 4.8% and 7%, repectively. (nutraingredients-usa.com)
Both fat-soluble vitamins play a central role in how the body utilizes calcium, synergistically. (nutraingredients-usa.com)

Acidocalcisomes are acidic calcium stores found in diverse organisms, being conserved from bacteria to humans. (jove.com)

While calcium is a poorer conductor of electricity than copper or aluminium by volume, it is a better conductor by mass than both due to its very low density. (wikipedia.org)

Equilbrium calcium binding was specific, concentration dependent and saturable. (nih.gov)

and calcium and structure of cell membranes. (elsevier.com)

In laboratory, they are obtained from calcium: The oxides exhibit basic character: they turn phenolphthalein red and litmus, blue. (euroshoe.com)

Taking an upper limit of urinary calcium excretion rate of 300 mg/24 hours, it was found in 77 (40%) of 192 patients in London. (bmj.com)
Bone calcium retention was measured using urinary levels of the rare radioisotope 41Ca. (nutraingredients-usa.com)

Insulin-like growth factor 1 (IGF-1) rapidly potentiates N and L calcium channel currents in cerebellar granule neurons by an unknown mechanism. (nih.gov)
Native AMPA receptors in the majority of CNS neurons display little calcium permeability. (jneurosci.org)

In contrast, the receptor lacking this subunit exhibits a strong inward rectification and a high calcium permeability. (jneurosci.org)

They take the drug by mouth and have daily blood tests until the dosage required to achieve normal blood calcium levels is determined. (clinicaltrials.gov)

89 Sr is an artificial radioisotope used in treatment of bone cancer. (wikipedia.org)

The attributes of naturally decaying atoms, known as radioisotopes, give rise to several applications across many aspects of modern day life (see also information paper on The Many Uses of Nuclear Technology ). (world-nuclear.org)

Anatomy1

Organisms2

Diseases1

Chemicals and Drugs70

Analytical, Diagnostic and Therapeutic Techniques and Equipment13

Phenomena and Processes10

Disciplines and Occupations1

Health Care2

Modulation of calcium mobilization in aortic rings of pregnant rats: Contribution of extracellular calcium and of voltage-operated calcium channels. (1/407)

A non-pungent triprenyl phenol of fungal origin, scutigeral, stimulates rat dorsal root ganglion neurons via interaction at vanilloid receptors. (2/407)

Ni2+ transport by the human Na+/Ca2+ exchanger expressed in Sf9 cells. (3/407)

Chronic fluoride ingestion decreases 45Ca uptake by rat kidney membranes. (4/407)

Stimulation of neutrophils by prenylcysteine analogs: Ca(2+) release and influx. (5/407)

Intracellular Ca(2+)-Mg(2+)-ATPase regulates calcium influx and acrosomal exocytosis in bull and ram spermatozoa. (6/407)

Demonstration of the rapid action of pure crystalline 1 alpha-hydroxy vitamin D3 and 1 alpha,25-dihydroxy vitamin D3 on intestinal calcium uptake. (7/407)

Xestoquinone, isolated from sea sponge, causes Ca(2+) release through sulfhydryl modification from skeletal muscle sarcoplasmic reticulum. (8/407)

Calcium Radioisotopes

Radioisotopes

Zinc Radioisotopes

Calcium Signaling

Radioisotope Dilution Technique

Strontium Radioisotopes

Calcium Channels

Iodine Radioisotopes

Calcium, Dietary

Krypton Radioisotopes

Indium Radioisotopes

Calcium Isotopes

Sodium Radioisotopes

Radioactivity

Barium Radioisotopes

Radionuclide Imaging

Yttrium Radioisotopes

Calcium Carbonate

Tin Radioisotopes

Carbon Radioisotopes

Iron Radioisotopes

Phosphorus Radioisotopes

Copper Radioisotopes

Beta Particles

Calcium Phosphates

Technetium

Mercury Radioisotopes

Technetium Tc 99m Sulfur Colloid

Calcium Chloride

Cesium Isotopes

Cobalt Isotopes

Cerium Radioisotopes

Hafnium

Gold Radioisotopes

Isotope Labeling

Lead Radioisotopes

Diagnostic Techniques, Radioisotope

Sulfur Radioisotopes

Zinc Isotopes

Calcium Channels, L-Type

Cadmium Radioisotopes

Astatine

Calcium Oxalate

Radioimmunotherapy

Lutetium

Rhenium

Calcium Gluconate

Samarium

Radiopharmaceuticals

Soil Pollutants, Radioactive

Scintillation Counting

Bromine Radioisotopes

Subdural Effusion

Radioactive Waste

Serum Albumin, Radio-Iodinated

Ruthenium Radioisotopes

Intestinal Absorption

Radiometric Dating

Selenium Radioisotopes

Tissue Distribution

Alpha Particles

Calcium Compounds

Kinetics

Heterocyclic Compounds, 1-Ring

Sodium Pertechnetate Tc 99m

Tungsten

Isotopes

Calcium Channels, N-Type

Pentetic Acid

Methods

Radioisotope Teletherapy

Egtazic Acid

Spectrometry, Gamma

Time Factors

Nuclear Medicine

Technetium Tc 99m Pentetate

Calcium Channel Agonists

Radiometry

Absorption

Rosaniline Dyes