No description available.

No description available.

Thesis--University of Illinois. / Vita. Includes bibliographical references.

Thesis--University of Illinois. / Vita. Includes bibliography.

Aquatic hypoxia, or low dissolved oxygen, is a growing environmental concern and has detrimental effects on many fishes. Research on fish responses to hypoxia includes whole animal studies as well as organ culture systems. In this thesis, the gulf killifish, Fundulus grandis, was used to determine the interaction between hypoxic exposure and four common euthanasia techniques on selected blood and gill variables and to develop an in vitro gill incubation system. Euthanasia techniques had differential effects on blood and gill, with the common fish anesthetic MS-222 having the greatest effects, but none altered the response to hypoxia. During the development of gill culture, the highest gill viability was measured in isosmotic seawater medium and shorter incubation times. This study provides insight into the applicability of different euthanasia techniques in hypoxia research, as well as preliminary observations on an incubation system for isolated gills.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1995. / Includes bibliographical references (p. 198-202). / The thesis focuses on a large residence by architect Irving Gill: the house for Marie and Chauncey Dwight Clarke in Santa Fe Springs, California (1919-22). The Clarke House was only discovered as a Gill building in 1981; and although praised by a prominent California historian as a project comparable in the strength of its design to Gill's masterpiece Dodge House (1914-16), there has been virtually nothing published on the project. The thesis attempts to collect the known information about the Clarke House; it documents the house through a series of new photographs, and provides a first set of drawings for the project. The Clarke House is set within the context of Gill's oeuvre in order to lay the groundwork for a wider critical interpretation. The thesis seeks a methodological approach which would avoid seeing Gill's work as either a purely regionalist phenomenon, or an example of Gill's proto-(European) modernism. Rather, the thesis adopts a method which could be called an "iconology of materials." A focus on the material context does not imply any obvious mechanistic relation between the properties of reinforced concrete and Gill's architectural forms - indeed, it will be shown that there is no obvious correlation. While Gill has become synonymous with the pioneering of concrete building technology in California, his interest in the material was always tempered by an intensely pragmatic social philosophy, predicated on economy. In proposing a cultural analysis of concrete in Gill's work, the thesis attempts to account for Gill's passion for reinforced concrete and his ambivalence to its structural potential. It analyzes how Gill exploited concrete's plasticity, monolithic quality, color, and surface effects. Comparisons of the Clarke House to several other major residences also built in Los Angeles c. 1920, show that he was not alone in the metaphoric rediscovery of concrete in California. Yet, the thesis argues that Gill's particular mastery of the material, as evidenced in the Clarke House, depended on his distillation of poignant symbolic images in the work. / by Sean Scensor. / M.S.

No description available.

Two aspects of teleost respiration have been emphasised in this investigation. Firstly the gill filaments themselves were observed in order to determine whether or not they played an active role in the ventilation of the gill lamellae. The musculature of the filaments was studied, using visual and electronic methods, and continual muscular activity was noted. Two possible functions of these muscles of the gill filaments have been proposed. Secondly, the brain centres which initiate and maintain the respiratory rhythm were investigated. The neural mechanism was found to be much more complex than had hitherto been suspected in the literature. / Thesis / Doctor of Philosophy (PhD)

No description available.

Thesis (M.C.S.)--Regent College, Vancouver, BC, 1993. / Abstract and vita. Includes bibliographical references (leaves 108-111).