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Showing 1 to 20 of 38 for “"Fluoride-ion"”.
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Novel Potentiometric Enzyme Electrode Based on the Fluoride Ion-Selective Sensor.
… a potentiometric procedure for the determination of hydrogen peroxide using an immobilized enzyme and a fluoride ion-selective electrode. The reaction between hydrogen peroxide and certain organo-fluoro compounds is catalyzed by the enzyme horseradish peroxidase to release fluoride ions.
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The sorption of fluoride ion with special reference to fluoride removal from potable waters
… recent discovery that even very small concentrations of fluorides in drinking waters are sufficient to cause the serious dental dystrophy commonly known as mottled enamel, has around widespread interest and concern. Federal and State surveys have been conducted to determine the geographical …
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Burial Chronological Sequencing of the Colonial Maya Cemetery at Tipu, Belize Using Fluoride Ion Analysis
… thesis ascertains the sequence of burials using fluoride ion electrode analysis at the colonial cemetery at Tipu, Belize in order to explore demographic and other cultural effects associated with European contact. The cemetery at Tipu in west central Belize, dating from within the first century …
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Available fluoride ion in solution and one minute fluoride release rate of a toothpaste formulation
Damaged enamel of an early carious lesion can be repaired through the body’s natural repair process known as remineralization. For remineralization to occur, bioavailable calcium, phosphate, and fluoride ions must be present at the surface of the tooth. Toothpaste products supply bioavailable …
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Phosphate, Calcium, and Fluoride Ion Release From Polyurethane Based Microcapsules Formulated in a Resin Based Dental Varnish
… significant oral health challenge. Demineralization occurs in an acidic environment and can be further accentuated by the presence of acid producing cariogenic bacteria. As the pH decreases, the salivary fluid becomes undersaturated with calcium and phosphate ions, resulting in these ions being …
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A Computer-Controlled Automated Spectrophotometric System for Reaction-Rate Measurements With Application to the Quantitative Determination of Fluoride Ion
Made available in DSpace on 2014-12-10T23:01:31Z (GMT). No. of bitstreams: 1 7317258.pdf: 4574639 bytes, checksum: 739d2cf0ba64b5917cf2626551156a62 (MD5) Previous issue date: 1972
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Development of Fluorine-18 Halofluorination and Fluorine-18 Fluoride Ion Displacement Reactions for the Synthesis of Fluorine-18 Labeled Radiopharmaceuticals (Spiperone, Spiroperidol, N-Alkylation, Radioactivity)
… labeling methods, ('18)F halofluorination and ('18)F fluoride ion displacement reactions, have been developed to assess their potential for labeling molecules with the positron-emitting radionuclide fluorine-18 at the no-carrier-added level.
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Observation by flow 1H NMR and dimerization kinetics and products of reactive ortho-quinodimethanes and benzocyclobutadiene
… acetonitrile-d[subscript]3 (CD[subscript]3CN) by fluoride ion induced 1,4-elimination from (1-(trimethylsilylmethyl)) trimethyl(2-naphthylmethyl)ammonium iodide (10), was obtained in the absence of precursor and dimers. However, the [superscript]1H NMR spectrum of the more reactive 1, generated in …
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The interaction of some halogenated anaesthetic agents with hepatic drug metabolizing enzymes
This thesis comprises a report of investigations into the interaction of the volatile anaesthetic agents, fluroxene, 2,2,2-trifluoroethyl ethyl ether(TFEE), methoxyflurane and enflurane, with hepatic drug metabolizing enzymes in vivo and in vitro. Each of the anaesthetic agents interacts with the …
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Molecular-Level Understanding of Electrochemical Reaction Mechanisms and Electrode Interphases in Metal-CFx Batteries
… battery materials is crucial for applications spanning from electric vehicles to space exploration. Metal anode and conversion-type batteries provide higher specific energy compared to conventional intercalation-based systems. Among these, metal-carbon monofluoride (CF<sub>x</sub>) …
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NMR studies of conduction mechanisms in electrolyte materials for fuel cells
… and efficient electrochemical energy conversion devices which have garnered much scientific attention in recent years as clean renewable sources of energy. However, development is currently restrained by materials limitations, particularly those associated with the electrolyte. A number of …
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Design, Synthesis and Biological Properties of Fluorinated Estrogens, Progestins and Androgens, Potential Imaging Agents for Receptor-Positive Mammary and Prostate Tumors (fluorine-18)
… fluorinated at the 17(alpha)- and 16(alpha)-positions were synthesized in the development of a potential fluorine-18 radiolabel useful as a means of quantifying estrogen receptor in receptor-positive mammary tumors. The affinities of the compounds for estrogen receptor were measured using …
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On the Stereochemistry of Allylmetal-Aldehyde Condensations (Allyltrimethylsilane, Allyltributylstannane, Homoallylic Alcohols)
… the intramolecular allylmetal-aldehyde condensation of allylsilane 3a, allylstannane 3b, and pentadienylsilane 6 has been investigated. A modest preference for the syn isomer 4 arising from a synclinal orientation of double bonds was observed with the Lewis acid catalyzed reaction of 3a. The …
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I.~fluorine-18 Labeled Corticosteroids and Progestins for Receptor-Based Imaging of the Brain and of Breast Tumors. II.~Synthesis and NMR Spectrum of (carbon-13(18))-Meso-Hexestrol
… changes through the use of positron emission tomography and an appropriate fluorine-18 labeled ligand. We have prepared fluorinated analogs of six natural and synthetic corticosteroids as potential diagnostic imaging agents for Alzheimer's dementia. Four of these ligands have been prepared …
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Fluorine-18-labeled estrogens, progestins and corticosteroids for receptor-based imaging of breast tumors and target areas of the brain
… can be labeled with the positron-emitting radionuclide fluorine-18 (t$\sb{1/2}$ = 110 min) by fluoride ion (n-Bu$\sb4$N$\sp{18}$F) displacement of a 16$\beta$-trifluoromethanesulfonate (triflate) derivative of the corresponding estrone 3-triflate, and purification by HPLC. That sequence has …
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I. Direct observation of o-xylylene (o-quinodimethane) in solution, Dimerization kinetics of some o-quinodimethanes; II. Kinetic and product studies on the dimerization of [alpha]-methyl-substituted o-quinodimethanes; III. Direct observation of 1,2-napthoquinodimethane and 9,10-phenanthroquinodimethane, Dimerization kinetics of resonance-stabilized o-quinodimethanes
<p>Fluoride ion induced 1,4-elimination from o (trimethylsilyl)- methyl benzyl trimethylammonium iodide (7) has been used to generate o-xylylene (1) in solution. o-Xylylene (1) was observed directly in solution by UV-visible spectroscopy. Using stopped-flow UV-visible spectroscopy it was determined …
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Design, synthesis, and biochemical evaluation of three types of hexestrol-based probes for estrogen receptor: Fluorine-18 radiopharmaceuticals, bivalent ligands and diazirine photoaffinity reagents
… major focus of biological and clinical investigation in diagnostic and therapeutic drug design for human breast carcinoma. Molecular probes, such as fluorine-18 radiopharmaceuticals, bivalent ligands, and affinity labels, provide information toward a better understanding of ER localization, …
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