Thesis (M.S.)--Oregon State University, 1982. / Typescript (photocopy). Includes bibliographical references (leaves 83-90). Also available online.

The genotype frequencies of one-year-old oyster spat (Crassostrea gigas) from parents of known genotype, are compared to the frequencies expected with Mendelian inheritance. The genotypes are characterized at three enzyme loci, Aspartate amino-transferase (AAT), Phosphohexose isomerase (PHI) and Leucine aminopeptidase (LAP), and a general protein locus. In this study expression of these loci as histochemically stained patterns on a gel following electrophoresis is controlled by two codominant alleles at each locus. Frequencies of the genotypes at all four loci, in all offspring groups investigated, are not statistically different from those expected with Mendelian inheritance, supporting the hypothesis that this is the method of inheritance. It is further concluded that there are no large amounts of selection connected with any of these loci. An additional observation, that there is no statistical difference between genotype ratios of siblings in two different growing areas, is discussed in terms of G. Williams' (1975) "elm-oyster" model. It is suggested that the search for selection at single loci is probably not a generally useful one for the oyster breeder. / Graduation date: 1977

Graduation date: 1978

Thesis (Ph.D.)--Murdoch University, 2008. / Thesis submitted to the Faculty of Health Sciences. Includes bibliographical references (p. 200-209)

Thesis (Ph. D.)--University of Chicago, Dept. of Botany, 1922. / Includes bibliographical references.

Thesis (Ph. D.) in Marine Biology--University of Maine, 2000. / Includes vita. Includes bibliographical references (leaves 76-85).

Thesis (Ph. D.)--University of Hong Kong, 1997. / Includes bibliographical references (leaf 202-256).

The yellow discoloration in canned oysters, which appeared after several months of storage, has been proven to be due to carotenoid pigments which were contained in the liver of the oyster. It was found after making carbon disulfide extractions of the liver and of the discolored tissue from canned oysters obtained from four different areas that the yellow pigments in the discolored tissue and in the livers of these oysters were identical. This conclusion was drawn following ten separate chromatographic analyses of these extracts. Analysis with the spectrograph further showed that the pigments responsible for the major portion of the discoloration was carotene. The absorption bands of this pigment in a carbon disulfide solution were found to lie at 521 and 485 millimicrons. These lines corresponded to those for beta carotene. It was also observed that these carotenoid pigments from the liver diffused slowly through the surrounding tissue and that the time required for the color to reach the surface of the oyster depended upon the thickness of the tissue. In a preliminary test it was also found that higher temperatures in storage tended to hasten the discoloration while samples held at zero degree Fahrenheit inhibited the diffusion of the color to the surface. / Graduation date: 1940

Typescript. / Bibliography: leaves 136-161. / xiv, 161 l illus

Thesis (M.Sc.)--College of William and Mary. / Vita. Includes bibliographical references. Also available via the World Wide Web.