No description available.

No description available.

No description available.

No description available.

In wheat grains, mineral nutrients are stored in spherical particles called globoids. Globoids are located within the protein bodies of cells from the aleurone layer, scutellum and embryonic axis of the wheat grain. Composed of phytate, globoids contain an essential source of myo-inositol, P, K, Mg, Ca, Mn, Fe and Zn which are used by the growing seedling during early seedling growth. Changes to the element composition within the globoids from the aleurone, scutellum and embryo axis, during seed set and early seedling growth were examined in two cultivars of wheat through the use of energy dispersive X-ray analysis. During seed set and early seedling growth the composition of the globoids within all tissues changed. In each of the tissues in both cultivars the P levels decreased during seed set and remained relatively constant during early seedling growth. K levels increased during seed set and decreased during early seedling growth. Mg and Ca levels generally decreased during seed set and increased during early seedling growth. Mn and Zn were detected only within globoids within the embryonic axis and no changes were noted for these two elements. Energy dispersive X-ray analysis showed that A.C. Reed and Celtic grains both followed the same general trends during seed set and seedling growth indicating that the differing protein content of the two cultivars had little effect on the timing of mineral nutrient accumulation and utilization within the globoids. Atomic absorption analysis of whole grain tissue for P, K, Mg and Ca revealed that Celtic grains had higher concentrations of P and K while being grown in identical conditions to that of A.C. Reed grains. These results indicate that mineral nutrient levels within the grain seem to be influenced by the cultivar, and possibly the protein content of the particular cultivar. / Thesis / Master of Science (MS)

no abstract provided by author / Master of Science

The general problem examined in this study is that of competition versus administration in the determination of the price of wheat.

This study describes the analysis of orientation measurements of elongated quarts grains in graywackes of turbidite nature of the Normanskill formation of New York and the Quebec Group of Quebec. Definite relationships are demonstrated between the direction of flow, as indicated by the measurement of the flute casts, and the preferred orientation direction of the sand grains. Dimensional orientation analysis of sand grains in thin section can be used to determine the transport direction of the turbidity current where this can not be determined by other means. Size and shape analysis of quartz grains in thin section might be biased depending on how the thin section is cut with respect to the fabric of the rock. / Thesis / Candidate in Philosophy

No description available.

Sigma 3 grain boundaries play a large role in the microstructure of fcc materials in general, and particularly so in grain boundary engineered materials. A recent survey of grain boundary properties revealed that many of these grain boundaries possess very large mobilities, and that these mobilities increase at lower temperature, contrary to typical models of thermallyactivated grain boundary motion. Such boundaries would have a tremendous mobility advantage over other boundaries at low temperature, which may explain some observed instances of abnormal grain growth at low temperature. This work explains the boundary structure and motion mechanism that allows for such mobilities, and explores several of the unique factors that must be considered when simulating the motion of these boundaries. The mobilities of a number of boundaries, both thermally-activated and antithermal, were then calculated over a wide temperature range, and several trends were identified that relate boundary crystallography to thermal behavior and mobility. An explanation of the difference in thermal behavior observed in sigma 3 boundaries is proposed based on differences in their dislocation structure.