Typescript. / Digitized by Kansas Correctional Industries

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1939. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 87).

Thesis (M.S.)--University of Wisconsin--Madison, 1971. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (doctoral)--Universität Marburg, 1931. / "Lebenslauf." Includes bibliographical references (p. 40-44).

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. [97]-109.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Abstracted in Dissertation abstracts, v. 18 (1958) no. 3, p. 766. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 33-35).

A cytological study of sporogenesis, mature uredospores and hydrated uredospores of Puccinia graminis tritici was made to determine if a definitive nucleolus was present. Electron microscopy has shown that the nuclei in immature uredospores and associated fungal tissue of the uredosorus possess prominent nucleoli. Nucleoli whose average diameter was 1.7 microns were observed in 58 percent of the nuclear sections from immature uredospores. Presence of a nucleolus in ultrathin sections of mature uredospores is established. Nucleoli whose average diameter was 0.5 microns were observed in 6 percent of the nuclear sections from mature uredospores. Nucleoli were not observed in hydrated uredospores which had resumed active metabolism. The reduction in the size of the nucleoli in mature uredospores and absence of nucleoli in hydrated uredospores may indicate that ribosomal RNA synthesis is repressed as uredospores mature. / Land and Food Systems, Faculty of / Graduate

Allocation of blade surface area to meiospore production was quantified for semelparous and iteroparous representatives of the genus Laminaria (Phaeophyta: Laminariales) at each of two sites in Barkley Sound, Vancouver Island, B.C. The annual semelparous sporophyte Laminaria ephemera produced sori between April and July; a maximum mean percentage of 31.7% of total vegetative blade area was devoted to sorus production, and 100% of the individuals were reproductive within at least one sample. The perennial iteroparous sporophyte Laminaria setchellii produced sori throughout the year; a maximum mean percentage of 30.4% of total blade area was devoted to sorus production, and a maximum of 54% of the individuals were reproductive within any sample. These results are discussed in the context of life history evolution. Concentric rings are visible in cross-section of the stipes of Laminaria setchellii. These rings were demonstrated to form annually, and thereby permitted estimation of individual age and of age structure among populations of L. setchellii at two sites in Barkley Sound. Age structures were dissimilar between populations, and showed no evidence of stability. The twelve year age class was most abundant at one site (Wizard Rock), and the two and three year age classes were most abundant at a second site (Execution Bay). / Science, Faculty of / Botany, Department of / Graduate