During the initial phase of a program to search for sub -stellar candidates at high galactic latitudes in the IRAS Serendipitous Survey Catalog, one source, SSC 08546 +1732, was found to have no optical counterpart on the Palomar Observatory Sky Survey plates. Ground based positional, photometric and spectroscopic observations have identified this source as a heavily dust - enshrouded carbon star, similar to those found in the Galactic plane. The high latitude and relative faintness of this source imply that it lies at a distance of 20 - 50 kpc, and is 10 to 30 kpc out of the plane of the Galaxy. SSC 08546 +1732, along with one other distant obscured carbon star found in the IRAS Point Source Catalog (Low 1987; Beichman e1: al. 1988), represent the first examples of such objects found in the Galactic halo. These stars may either have evolved from population I precursors ejected from the disk, or they may be the first obscured Population II halo carbon stars to be observed. A survey for other distant enshrouded carbon stars in the IRAS Faint Source Catalog should help to elucidate the nature of this new population.

Orientador: Helena Redigolo Pezza / Coorientador: Leonardo Pezza / Banca: Aristeu Gomes Tininis / Banca: Geoffroy Roger Pointer Malpass / Resumo: A determinação de antibióticos tem sido assunto cada vez mais presente nos estudos de química, seja sua determinação para o controle de qualidade dos medicamentos ou determinação de resíduos em alimentos. O trabalho foi desenvolvido em duas etapas. A primeira parte do trabalho permitiu o desenvolvimento de uma metodologia simples, rápida e de baixo custo, onde se faz uso do procedimento de Análise por Injeção em Fluxo (FIA) com detecção espectrofotométrica para averiguar a presença de sulfaquinoxalina sódica em amostras de três tipos diferentes de medicamentos veterinários. A metodologia foi otimizada por planejamento de experimentos. O reagente cromogênico utilizado foi o pdimetilaminocinamaldeído (p-DAC) que na presença de ácido clorídrico (HCl) e o surfactante Dodecilsulfato de sódio (SDS), forma um produto colorido (l = 560 nm) com a compostos da classe das sulfonamidas (Base de Schiff). A segunda parte do permitiu o desenvolvimento de uma metodologia simples (método de screening), rápida, de baixo custo e acima de tudo limpa para determinação de sulfonamidas em amostras de mel, considerando preceitos da Química Verde e com isso reduzir ao máximo a geração de resíduos químicos e o uso de solventes orgânicos. O procedimento de análise que serviu como base para obtenção dos resultados foi a Análise por Injeção em Fluxo (FIA) com o uso de uma cela de longo caminho óptico (b = 100 cm) para detecção espectrofotométrica, permitindo assim um aumento significativo na sensibilidade do método de screening proposto. O sistema de detecção utilizado foi o espectrofotométrico na região do visível através das medidas de absorbâncias, em um comprimento de onda de l = 560 nm, do produto formado entre o analito (sulfaquinoxalina sódica - SQX, sulfadimetoxina - SDX e sulfatiazol - STZ) e... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The analytical determination of antibiotics has been subject increasingly present in chemistry studies, whether its determination to verify the presence medications (with the purpose of comparison with the label) or determination of residues in foods. The first part of this work presents the development of a simple, fast and low cost method, which makes use of the FIA procedure with UV detection to determine the presence of sodium sulphaquinoxaline in samples of three different types of veterinary medicines. The methodology was developed through statistical analysis, optimizing the chemical parameters (concentration) and physical values that provided the best absorbance at l = 560 nm. The chromogenic reagent used was p-DAC in the presence of HCl and SDS form a colored product with the compounds of the class of sulfonamides (Schiff base). The second part of the study aims to develop a simple methodology (screening method), rapid, inexpensive and above all clean for the determination of sulfonamides in honey samples, considering principles of green chemistry and thereby reduce the maximum generation chemical waste and the use of organic solvents. The analysis procedure that will serve as the basis for obtaining the results is the Flow Injection Analysis (FIA) using a cell along the optical path (b = 100 cm) for spectrophotometric detection, thereby allowing a significant increase in sensitivity of the screening method proposed. The detection system will be in the visible region spectrophotometer by measuring absorbance at a wavelength l = 560 nm, the product formed between the analyte (sodium sulphaquinoxaline - SQX, sulfadimethoxine - SDX and sulfathiazole - STZ) and chromogenic reagent (p-dimethylaminocinnamaldehyde - p-DAC), known as Schiff base. The interest in using this method... (Complete abstract click electronic access below) / Mestre

Ho Chak Ming. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaves 122-126). / Acknowledgment --- p.i / Table of contents --- p.ii / List of figures --- p.iv / List of tables --- p.v / Abstract --- p.ix / Chapter Part I --- Determination of sulphide / General introduction --- p.1 / Spectrophotometric determination of sulphide --- p.5 / Chapter 1. --- Introduction --- p.5 / Chapter A. --- Review of the reported methods for the determination of sulphide --- p.5 / Chapter B. --- General description of the proposed method --- p.13 / Chapter 2. --- Experimental section --- p.18 / Chapter A. --- Preservation of samples --- p.18 / Chapter B. --- Sample pre-treatment --- p.19 / Chapter C. --- Separation/preconcentration of sulphide --- p.19 / Chapter D. --- Spectrophotometric determination of sulphide by proposed method --- p.24 / Chapter E. --- Spectrophotometric determination of sulphide by standard methylene blue method as the counter-check method --- p.32 / Chapter 3. --- Results and discussions --- p.34 / Chapter A. --- Optimization of the proposed spectrophotometric method --- p.34 / Chapter B. --- Optimization of the separation/preconcentration methods --- p.45 / Chapter C. --- Construction of the calibration graph for the spectrophotometric determination of sulphide and determination of the molar absorptivity coefficient --- p.53 / Chapter D. --- Precision and detection limit of the proposed spectrophotometric method --- p.54 / Chapter E. --- Interferences studies of the proposed method --- p.56 / Chapter F. --- Spectrophotometric determination of sulphide in water --- p.60 / Chapter G. --- Spectrophotometric determination of sulphide in beers --- p.63 / Chapter H. --- Spectrophotometric determination of sulphide in orange juices --- p.66 / Chapter 4. --- Conclusions --- p.68 / References --- p.70 / Chapter Part II --- Determination of fluoride / General introduction --- p.75 / Spectrophotometric determination of fluoride --- p.78 / Chapter 1. --- Introduction --- p.78 / Chapter A. --- Review of the reported methods for the determination of fluoride --- p.78 / Chapter B. --- General description of the proposed scheme for the spectrophotometric determination of fluoride in animal feeds --- p.84 / Chapter 2. --- Experimental Section --- p.87 / Chapter A. --- Ashing of the animal feed samples --- p.87 / Chapter B. --- Reduction of interferences in the ashed sample solutions using anion exchange resin --- p.89 / Chapter C. --- Preparation of solutions for the calibration graph and the ashed sample solutions for the spectrophotometric measurement --- p.90 / Chapter D. --- Spectrophotometric determination of fluoride in the ashed samples --- p.92 / Chapter E. --- Potentiometric determination of fluoride in the ashed sample solutions by the FISE method as the counter-check method --- p.93 / Chapter 3. --- Results and discussions --- p.94 / Chapter A. --- Ashing conditions of the animal feed samples --- p.94 / Chapter B. --- Removal of the interferences in the ashed sample solutions --- p.99 / Chapter C. --- Construction of the calibration graph for the spectrophotometric determination of fluoride --- p.112 / Chapter D. --- Precision of the spectrophotometric method --- p.113 / Chapter E. --- Spectrophotometric determination of fluoride in animal feeds --- p.114 / Chapter F. --- Potentiometric determination of fluoride in animal feeds by the FISE method as the counter-check method --- p.117 / Chapter 4. --- Conclusions --- p.120 / References --- p.122

Thesis (M.Phil.)--The Chinese University of Hong Kong. / Bibliography: leaf 88.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Mainly comprised of articles written with other members of a research group. "The kinetics of thiocyanate binding to aquocobalamin" by William C. Randall and R.A. Alberty, reprinted from Biochemistry 5, 3189 (1966) inserted between leaves 2 and 8. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

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Made available in DSpace on 2014-06-11T19:29:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-01-15Bitstream added on 2014-06-13T20:18:56Z : No. of bitstreams: 1 catelani_ta_me_araiq_parcial.pdf: 56034 bytes, checksum: e0fec83762961fb2a290c883707606eb (MD5) Bitstreams deleted on 2014-11-14T12:16:58Z: catelani_ta_me_araiq_parcial.pdf,Bitstream added on 2014-11-14T12:17:45Z : No. of bitstreams: 1 000712502.pdf: 601891 bytes, checksum: 8df643c4b32a26b896742e14086cbcb1 (MD5) / A determinação de antibióticos tem sido assunto cada vez mais presente nos estudos de química, seja sua determinação para o controle de qualidade dos medicamentos ou determinação de resíduos em alimentos. O trabalho foi desenvolvido em duas etapas. A primeira parte do trabalho permitiu o desenvolvimento de uma metodologia simples, rápida e de baixo custo, onde se faz uso do procedimento de Análise por Injeção em Fluxo (FIA) com detecção espectrofotométrica para averiguar a presença de sulfaquinoxalina sódica em amostras de três tipos diferentes de medicamentos veterinários. A metodologia foi otimizada por planejamento de experimentos. O reagente cromogênico utilizado foi o pdimetilaminocinamaldeído (p-DAC) que na presença de ácido clorídrico (HCl) e o surfactante Dodecilsulfato de sódio (SDS), forma um produto colorido (l = 560 nm) com a compostos da classe das sulfonamidas (Base de Schiff). A segunda parte do permitiu o desenvolvimento de uma metodologia simples (método de screening), rápida, de baixo custo e acima de tudo limpa para determinação de sulfonamidas em amostras de mel, considerando preceitos da Química Verde e com isso reduzir ao máximo a geração de resíduos químicos e o uso de solventes orgânicos. O procedimento de análise que serviu como base para obtenção dos resultados foi a Análise por Injeção em Fluxo (FIA) com o uso de uma cela de longo caminho óptico (b = 100 cm) para detecção espectrofotométrica, permitindo assim um aumento significativo na sensibilidade do método de screening proposto. O sistema de detecção utilizado foi o espectrofotométrico na região do visível através das medidas de absorbâncias, em um comprimento de onda de l = 560 nm, do produto formado entre o analito (sulfaquinoxalina sódica – SQX, sulfadimetoxina – SDX e sulfatiazol - STZ) e... / The analytical determination of antibiotics has been subject increasingly present in chemistry studies, whether its determination to verify the presence medications (with the purpose of comparison with the label) or determination of residues in foods. The first part of this work presents the development of a simple, fast and low cost method, which makes use of the FIA procedure with UV detection to determine the presence of sodium sulphaquinoxaline in samples of three different types of veterinary medicines. The methodology was developed through statistical analysis, optimizing the chemical parameters (concentration) and physical values that provided the best absorbance at l = 560 nm. The chromogenic reagent used was p-DAC in the presence of HCl and SDS form a colored product with the compounds of the class of sulfonamides (Schiff base). The second part of the study aims to develop a simple methodology (screening method), rapid, inexpensive and above all clean for the determination of sulfonamides in honey samples, considering principles of green chemistry and thereby reduce the maximum generation chemical waste and the use of organic solvents. The analysis procedure that will serve as the basis for obtaining the results is the Flow Injection Analysis (FIA) using a cell along the optical path (b = 100 cm) for spectrophotometric detection, thereby allowing a significant increase in sensitivity of the screening method proposed. The detection system will be in the visible region spectrophotometer by measuring absorbance at a wavelength l = 560 nm, the product formed between the analyte (sodium sulphaquinoxaline - SQX, sulfadimethoxine - SDX and sulfathiazole - STZ) and chromogenic reagent (p-dimethylaminocinnamaldehyde - p-DAC), known as Schiff base. The interest in using this method... (Complete abstract click electronic access below)

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