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D.Phil. / The determination of several physiologically important molecules has been carried out using an oxygen electrode and various oxidase or oxygenase enzymes. The enzymatic reactions are monitored either by measuring the initial rates of oxygen uptake from the medium or by calculating the total amount of oxygen consumed in the reactions. Because of the use of enzymes, the determinations are rapid and sensitive and each one is highly specific. Versatility of analysis can be introduced into the system by suitable choice of the enzyme. Furthermore, the methods are simple, and colour or turbidity does not interfere, thus enabling even whole blood to be used directly as sample material ...

Abstract Dissolved organic matters are important photosensitizer for the photochemical reactions in natural water. In this study, the photochemical reactions sensitized by seawater were collected from Kaoshiung harbor and coastal areas. The steady-state concentrations of singlet oxygen [1O2]ss were determined by using furfuryl alcohol as a trapping agent. PNAP-PYR actinometer were used to measure the integrated intensity incident on the sample during sunlight irradiation. The objectives of this study are : ¡]1¡^ Measure the mean [1O2]ss of seawater in the Kaoshiung sea area. ¡]2¡^ Test the correlation between TOC and [1O2]ss ¡]3¡^ Test the correlation between UV-VIS A370 and [1O2]ss ¡]4¡^ Test the correlation between fluorescence and [1O2]ss According to the experimental results, we have found that sunlight of different seasons have quite an influence to [1O2]ss. Dissolved organic matters play an important role in photochemical reactions in natural waters although the results show non-significant correlation between dissolved organic matters and [1O2]ss. Then we use SPSS to calculate the correlation of [1O2]ss and TOC¡BUV-VIS A370¡Bfluorescence. Only UV-VIS A370 and [1O2]ss is apparently correlated ¡]P¡Õ0.05¡^. We suggest that [1O2]ss can be estimated via the following equation [1O2]ss¡Ñ1015 ¡× 11.81A370¡Ï6.49. On November 2000, the mean [1O2]ss of seawater observed in Da-Lin-Pu outfall area and Tso-Ying outfall area are 6.91 ¡Ñ 10-16 M and 2.13 ¡Ñ 10-16 M respectively.

Thesis (Ph. D.)--California Institute of Technology, 1979. UM #79-09,834. / Advisor names from the Acknowledgements pages of the thesis. Title from home page. Viewed 12/01/2009. Includes bibliographical references.

published_or_final_version / Chemistry / Master / Master of Philosophy

Issued also as Thesis (Ph. D.)--Columbia University. / Bibliography: p. 37-38.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1937. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1972. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Hong Kong, 1997. / Includes bibliographical references (leaf 165).