(n.) The name given by Mendelejeff in accordance with the periodic law, and by prediction, to a hypothetical element then unknown, but since discovered and named scandium; -- so called because it was a missing analogue of the boron group. See Scandium.
Example Sentences:
Scandium
Definition:
(n.) A rare metallic element of the boron group, whose existence was predicted under the provisional name ekaboron by means of the periodic law, and subsequently discovered by spectrum analysis in certain rare Scandinavian minerals (euxenite and gadolinite). It has not yet been isolated. Symbol Sc. Atomic weight 44.
Example Sentences:
(1) These data indicate that 1) the equilibrium stability constant is not a good indicator of the in vivo stability of metal-labeled proteins and 2) it is possible to manipulate the ion distribution and therefore the dose from scandium-47 and yttrium-90 after injection of the labeled proteins.
(2) Various soluble tracers were evaluated, among them indium, scandium, and bromine.
(3) One additional dog had complete occlusion of the left circumflex coronary artery followed by administration of Tc-MIBI and scandium-46-labeled microspheres.
(4) Nutrient markers were oxides of samarium, scandium, ytterbium, and europium.
(5) The results obtained show that, in vivo, scandium-47 and yttrium-90 are more easily displaced from DTPA by other ions than is indium-111.
(6) In the present study ovarian blood flow was determined before and after a single intravenous injection of LH to anaesthetized, post-pubertal virgin rabbits, using 15 plus or minus 5 mum microspheres, labelled with Ytterbium-169 and Scandium-46.
(7) Associated with the blood clearance is an uptake of radioactivity into the liver; scandium-47 has the highest concentration, indium-111 has the least, and yttrium-90 is intermediate.
(8) The concentrations of manganese, zinc, and cobalt showed some fluctuations without a definite increase or decrease, and the scandium and nickel content was found to be very low.
(9) The true distribution coefficient values of tervalent yttrium, scandium, europium and cerium ions were about 10(7.3), 10(9.8), 10(7.4) and 10(6.5), respectively.
(10) The lasers used were continuous-wave neodymium:yttrium aluminum garnet (YAG, 1.06 microns) and pulsed holmium:yttrium scandium galliam garnet (YSGG) (2.10 microns), erbium:YSGG (2.79 microns), and erbium:YAG (2.94 microns).
(11) Of the trivalent cations tested, aluminum, indium, and gallium were very effective precipitants, whereas iron and scandium were without effect at the concentrations tested.
(12) Among the 12 trace elements which were found only occasionally, chromium, mercury, silver, and cadmium were detected in approximately half and cerium and scandium in approximately one-fourth of the 45 samples studied.
(13) Coal dust aerosols with cesium-134 and scandium-46 labels were studied in dogs and rats following brief inhalation exposures by external measurement of gamma photons in the 0.6 to 0.8 and 0.9 to 1.1 MeV regions, respectively.
(14) Zinc, iron, cobalt, antimony, cesium, cerium, selenium, scandium, rubidium, chromium levels were measured by neutral activation technique.
(15) Urinary excretion of antimony, arsenic, bromine, cadmium, caesium, cobalt, copper, gold, iron, mercury, molybdenum, ribidium, scandium, selenium, silver, tungsten and zinc from five hypertensive patients beforeand during treatment with hydralazine has been investigated.
(16) Labeling was found to be efficient for all isotopes studied, including those of iodine, scandium, yttrium, indium, gadolinium, and bismuth.
(17) A total of 125 human lenses (97 senile cataractous and 28 clear) were analyzed by means of neutron activation analysis for trace element concentrations of copper, zinc, manganese, cobalt, rubidium, scandium, and nickel.
(18) The method is based on the reaction of isoniazid with 2-hydroxy-1-naphthaldehyde in acidic medium in the presence of excess of scandium.
(19) During each set of experimental conditions, a bolus of either saline or one of the anti-H2 drugs was administered, and, 15 min later, radiolabeled microspheres (ruthenium 103, scandium 46, and cerium 141) were injected into the left atrium for measurement of regional CBF.
(20) 47Ca activity was obtained by a gamma-ray spectrometer after exclusion of scandium 47.