Thesis (Ph. D.)--Université de Paris, 1899.

Thesis (Ph. D.)--Université de Paris, 1899.

Thesis (Ph. D.)--University of Toronto, 2007. / Source: Dissertation Abstracts International, Volume: 68-06, Section: A, page: 2625. Includes bibliographical references.

Thesis (M. Sc.)--University of Hong Kong, 1959. / An aporphine alkaloid, nuciferine, from asiatic lotus cultivated in Hong Kong, by H.R. Arthur and H.T. Cheung, in pocket on end papers. Type-written copy. Includes bibliographical references.

Thesis (M.S.)--Utah State Agricultural College, 1938. / Title from title screen (viewed Aug. 14, 2009). Department: Botany. Includes bibliographical references. Archival copy available in print.

Thesis (M.S.)--University of Wisconsin--Madison, 1961. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 29).

This work is essentially an investigation of non-convective moisture movement as the result of a temperature gradient in hygroscopic porous materials, in particular, cocoa beans. The aim of the research has been to determine experimentally the bulk moisture diffusion coefficient for cocoa, and, by quantifying it, to investigate the contribution of such diffusion to wetting and mould damage that has occurred on the surface of cargoes during shipment from West Africa to Northern Europe.

Studies have been conducted on the calcinogenic plant Trisetum flavescens in order to determine the physiological actions and chemical nature of the toxic substance or substances. An organic soluble substance was extracted and purified and shown to promote intestinal phosphate transport and increase plasma phosphate levels. This factor was shown to influence the movement of phosphate from the serosa to the bloodstream but not direct uptake from the intestinal lumen. This substance was found to be unlike vitamin D3 or its hydroxy - metabolites in that it did not promote intestinal calcium transport, or bone resorption when studied in vitro. This substance did decrease plasma alkaline phosphatase levels in vitamin D3-deficient chicks however. An aqueous soluble extract was partially purified on a Sephadex column and found to promote an increase in plasma phosphate in both vitamin D3-replete and vitamin D3-deficient chicks. The extract was also able to Influence intestinal phosphate transport in a similar manner to the organic solvent soluble phosphataemic factor. As both the aqueous soluble and organic solvent soluble factors were active in vitamin D3-deficient chicks they were presumed to act upon the paracellular route for intestinal phosphate uptake. The aqueous soluble factor differed from the organic solvent soluble one in that its administration produced a dramatic decline in the plasma calcium levels of vitamin Do-deficient chicks. The aqueous soluble factor MBS without effect upon bone cultured in vitro. A second aqueous soluble extract was shown to increase intestinal transport of calcium in chicks with a metabolic deficiency of vitamin D3 caused by the inclusion of strontium in the diet. This substance appears to be able to mimic the actions of 1,25(0H)2cholecalciferol. The potent aqueous soluble phosphataemic factor is not related chemically to vitamin but has the characteristics of an aromatic indole or amine. It is concluded that the actions of these three substances in raising plasma [Ca x Pi] results in calcinosis.

A clearing and staining method using 2 stains, with one acting as a counter-stain for fungi, gave higher estimates of fungal biomass than other staining methods and it correlated well with the agar film technique. Using the method, it was possible to examine the spatial distribution of hyphae on leaves which varied between leaf types and fungal species. Improvements were made to the agar film method by optimising extraction of hyphae from leaf litter and using a tetrazolium staining technique to detect metabolically active hyphae. An indirect method for estimating fungal biomass was developed using ergosterol as a marker. Conversion factors for ergosterol and biovolume to fungal biomass were shown to vary with fungal species, age and growth conditions, but no single parameter was found which could adequately explain this. In field studies on flooded gravel pits biomass was 0.02-6.66/0 leaf dry weight depending on leaf type, biomass method and submersion time. Biomass estimated using clearing and staining was significantly correlated with ergosterol and with the agar film method; the latter gave the highest estimates. In terms of allochthonous litter inputs, fungal biomass represented 0.03-16.22 kg/ha. Studies on a number of the gravel pit lakes demonstrated variation in communities of Ingoldian fungi both between lakes and within a single lake. Correlations were found with magnesium levels and litter inputs, but not with fungal biomass in the litter or cellulose decomposition. In one lake, decomposition of litter, fungal biomass and microbial populations were followed. No differences were found in biomass when animals were excluded although this influenced Ingoldian fungi. Higher numbers of Ingoldian fungi correlated with weight losses and biomass , and a competitive hierarchy was suggested to explain changes in fungal populations during decomposition.

Inaug.-Diss.--Würzburg. / Vita.