What's the difference between phosphor and phosphorescence?

Phosphor


Definition:

  • (n.) Phosphorus.
  • (n.) The planet Venus, when appearing as the morning star; Lucifer.

Example Sentences:

  • (1) The ADAM derivative of carnitine was separated from decomposition products of the reagent and related compounds such as amino acid derivatives on a silica gel column eluted with methanol-5% aqueous SDS-phosphoric acid (990:10:1).
  • (2) This demineralization was similar to enamel acid etched with 50% phosphoric acid for 2 mn.
  • (3) Chemical analyses of the radioactive species in the incubation medium showed that a considerable portion of the radiolabeled sugar nucleotide had broken down to cytidine, phosphoric acid, and sialic acid.
  • (4) There were no temperature induced changes in the other phosphorous components seen in the spectra with exception of a decrease in ATP for higher temperatures.
  • (5) Such aspects as the physics of the stimulable phosphor detector are dealt with, and image acquisition, processing, and hard-copy output.
  • (6) Multiple-inhibitor experiments of pyruvate decarboxylase show that inorganic phosphate and n-decyl ester of phosphoric acid are mutually exclusive.
  • (7) One group of 6 cats was fed a basal, naturally acidifying diet without added acidifiers, and another group of 6 cats was fed 1.7% dietary phosphoric acid.
  • (8) McArdle's disease was also detected by phosphor nuclear resonance in the two male children.
  • (9) The IP phosphor retains a latent image of the energy pattern to which it was exposed.
  • (10) After spraying the plates with phosphoric acid and heating, the amount of carbon from the charred compounds is measured densitometrically.
  • (11) The use of photo-simulated phosphor plates and scanned equalization radiographic systems for chest imaging are discussed.
  • (12) The six patients had normal hemoglobin levels and the serum concentration of the following urinary constituents was normal in most of the patients: albumin, carotene, 25-hydroxycalciferol, parathyroid hormone, calcitonin, calcium, phosphorous, osteogenous alkaline phosphatase, cholesterol, triglycerides, and serum lipoproteins.
  • (13) Hydrochloric and phosphoric acids were efficient between 20 and 50% concentrations.
  • (14) The sensitivity of storage phosphor imaging plates (SPIP) at megavolt photon energies (60Co, 6-, 10-, and 18-MV radiotherapy beams) is studied both experimentally and by Monte Carlo radiation transport calculations.
  • (15) The activated CO2 intermediate formed in the reaction catalyzed by glutamine-dependent carbamyl phosphate synthetase was identified as carbonic-phosphoric anhydride through the use of two independent procedures.
  • (16) The influence of sympathectomy of the ear artery in rabbits on the activity of a number of redox coenzymes inthe vascular wall (lactic, glucose-6-phosphoric, isocitrate, and succinic dehydrogenases: LDH, G-6-PDHm isoCDH, and SDH, respectively) was studied by the quantitative histochemical method.
  • (17) To assess the effects of left ventricular chamber volume on the mechanism of changes in left ventricular developed pressure we performed phosphorous-31 nuclear magnetic resonance spectroscopy, hydrogen-1 nuclear magnetic resonance spectroscopy with a shift reagent, two-dimensional echocardiography, atomic absorption spectrophotometry, microsphere analysis, and surface fluorometry on isovolumic isolated perfused rat hearts with incremental intraventricular balloon volumes, while left ventricular pressure was concurrently monitored.
  • (18) The subtle radiolucent polyethylene component was identified in all patients; adequate visualization in some cases may necessitate imaging with additional methods such as magnification, phosphor plate, and soft-tissue radiographic techniques; conventional tomography; and arthrography.
  • (19) Since it is well known that chronic alcohol consumption leads to hypophosphatemia and hypomagnesemia, we designed experiments to determine if controlled depletion of either phosphorous or magnesium (Mg2+) lead, in themselves, to cardiovascular disturbances and what effects these mineral depletions exert on myocardial cellular bioenergetics.
  • (20) A digital radiography system based on reusable, photostimulable phosphor technology was evaluated in approximately 3,500 portable chest radiographs of patients in an intensive care unit.

Phosphorescence


Definition:

  • (n.) The quality or state of being phosphorescent; or the act of phosphorescing.
  • (n.) A phosphoric light.

Example Sentences:

  • (1) Fluorescence and phosphorescence spectra and lifetime studies revealed that at least 75% of the porphyrins were bound to metal, probably Zn, while the rest was free.
  • (2) The inactivation of equine liver alcohol dehydrogenase by guanidine hydrochloride and urea has been studied by monitoring the intrinsic tryptophan fluorescence and phosphorescence emission.
  • (3) The constancy of the lifetime-normalized phosphorescence yield with apoazurin and with Trp-314 in alcohol dehydrogenase establishes that the intersystem crossing quantum yield is practically unaffected across the temperature range.
  • (4) The quantum yields for singlet oxygen formation via energy transfer from triplet alpha-terthienyl have been obtained from time-resolved measurements of its IR phosphorescence: these yields are in the 0.6-0.8 range in non-polar and polar (hydroxylic and non-hydroxylic) solvents.
  • (5) When pouring liquid nitrogen over the spots, a very intense bluish-white fluorescence followed by a long-lasting greenish phosphorescence is observed.
  • (6) Triphenylene was also extemporaneously determined by its phosphorescence spectrum at low temperature.
  • (7) 1O2 phosphorescence emission was enhanced in deuterated buffer and upon saturation of the sample with oxygen and could be quenched by the addition of sodium azide to the external medium.
  • (8) High-quality phosphorescence decay curves with a 10-microseconds time resolution were obtained at concentrations of the eosin probe down to 20 nM and in aqueous media at temperatures of 4-38 degrees C. A strong temperature dependence in the rotational behavior was observed for the band 3 anion transport protein, but the lectin receptors of the Friend erythroleukemia cells were found to be immobile on the time scale of 1-4000 microseconds at either 4 degrees C or 37 degrees C. The technique is applicable to other triplet probes and membrane components of living cells under conditions that do not destroy viability.
  • (9) Quantum yields, fluorescence decay times and phosphorescence of Yt base have been also determined.
  • (10) Samples of Precambrian rocks (1.7-2.6 billion years, U.S.S.R.) contain metalloporphyrins and linear tetrapyrrole pigment similar to phycobilin 655 from modern blue-green algae Microystis (according to data of phosphorescence spectroscopy).
  • (11) Barring major enzyme conformational changes in the vicinity of unmodified tryptophan residues when Trp-62 or Trp-108 are selectively modified, we find that Trp-108 dominates both the phosphorescence and the ODMR signals in native lysozyme.
  • (12) The second-order rate constants, k delta, for quenching of molecular singlet oxygen O2 (1 delta g) by nonsteroidal anti-inflammatory imidazole drugs have been determined using time-resolved phosphorescence detection of singlet oxygen.
  • (13) Images of the phosphorescence were collected using a series of different delay times after illumination with a light flash (less than 5-microseconds width at half-height), and the phosphorescence decay constants (lifetimes) and oxygen pressure were calculated for each pixel of the image arrays.
  • (14) Upon irradiation, a solution of porphyrins containing more than 0.1% HSA shows phosphorescence with a lifetime longer than 1 ms. With an increase in irradiation time, phosphorescence intensities and lifetimes of porphyrins increase, depending upon their concentrations and triplet lifetimes, and approach saturated values close to those under deaerated conditions.
  • (15) Changes in conformation of glutamate dehydrogenase from beef liver as a result of interactions with allosteric effectors have been demonstrated from the phosphorescence emission of tryptophan.
  • (16) In addition, at 77 K and 275 nm 4-fluorotryptophan displayed strong fluorescence and phosphorescence, with emission quantum yields comparable with those of tryptophan at 77 K and 275 nm.
  • (17) The phosphorescence spectra and phosphorescence excitation spectra as well as the ratio of fluorescence and phosphorescence yields and the triplet state lifetume have been measured.
  • (18) Its phosphorescence decay fits well to two exponential components of 1.02 and 0.12 s, with no contribution from long-lived Trp residues.
  • (19) The mammalian heterogeneous ribonucleoprotein (hnRNP) A1 and its constituent N-terminal domain, termed UP1, have been studied by steady-state and dynamic fluorimetry, as well as phosphorescence and optically detected magnetic resonance (ODMR) spectroscopy at cryogenic temperatures.
  • (20) The phosphorescence 0,0 band as well as the zero-field splittings of Trp-134 undergoes significant changes upon binding of oleic acid to BSA.