No description available.

Compared to upland areas and Scotland, the Holocene vegetational history of lowland England is poorly known. This is particularly the case for the region of Holdemess, eastern Yorkshire, where only a low number of poor temporal resolution pollen diagrams have been published, none of which include analysis of microscopic charcoal content. The records are also largely undated and as a result reliable correlation between sites is not possible, and the timings of the key vegetation changes recorded in the data remain unknown. In this study, high resolution pollen and charcoal records were produced from four small (24 ha) infilled basins located within central Holderness. Complementary techniques of percentage loss-on-ignition and pollen preservation analysis were also employed, and a comprehensive radiocarbon-dating programme was undertaken to provide a secure chronological framework. The palaeoecological records produced provide a high temporal resolution reconstruction of the Holocene development of central Holderness, particularly during the Early-Mid Holocene, and allow consideration of the changing roles that ecological interactions, climate, and human influence have played in determining the Holocene vegetational composition of the region. A number of significant landscape-scale disturbances of inferred anthropogenic origin were identified from ca 9290 BP onwards and shown to vary significantly in timing, duration and character between sites. It is proposed that this palaeoecological data can be used to supplement the poor archaeological record of the area. Several key issues including the role of climatic instability in determining vegetational composition during the Early Holocene, the interpretation of incidences of cereal-type pollen, the use of the charcoal record as a proxy indicator of human activity, and the use of pollen preservation analysis as an interpretational tool are also considered.

The phototactic zoospores of Nowakowskiella elegans (Nowak.) Schroeter and Cladochytrium replicatum Karling are similar in their ultrastructure and typical of the revised Chytridiales (Barr, 1980, Can. J. Bot. 58: 2380-2394). For a carbon source both species utilize cellulose, D-cellobiose, D-glucose, D-xylose, and D-mannose. Several sources of organic nitrogen, and inorganic nitrate, and ammonium are utilized. Both species are deficient for thiamine. Germination of the zoospore cyst in both cases is exogenous, and daughter nuclei migrate and divide independently in the developing rhizomycelium. Mitosis is intranuclear. Zoospore discharge in N. elegans is operculate and vesicular, and in C. replicatum inoperculate and vesicular. Resting spores are formed asexually in C. replicatum and sexually in N. elegans. Meiosis in N. elegans is described. Nowakowskiella and Cladochytrium are retained in the family Cladochytriaceae.

Typescript. / Thesis (Ph. D.)--University of Hawaii, 1963. / Bibliography: leaves 44-48. / iv, 48 leaves mount. ill., mount. diagrs., tables

Thesis (Ph. D.)--University of Canterbury, 2007. / Typescript (photocopy). Includes bibliographical references (leaves 170-182). Also available via the World Wide Web.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 71-73.

Thesis (Inaug.-Diss.)--Universität Basel, 1896? / Bibliography: p. 33-34.

Thesis (Ph. D.)--Illinois State University, 1988. / Title from title page screen, viewed September 14, 2005. Dissertation Committee: David F. Weber (chair), Herman E. Brockman, Robert W. Briggs, Alan J. Katz, Glen E. Collier. Includes bibliographical references (leaves 104-111) and abstract. Also available in print.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. Description based on print version record. Includes bibliographical references.