Biological Sciences - Theses, Dissertations, and other Required Graduate Degree Essays

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The western balsam bark beetle, öDöröyöoöcöoöeötöeös öcöoönöföuösöuös Swaine : secondary attraction and biological notes

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1981
Document type: 
Thesis
File(s): 
Senior supervisor: 
John H. Borden
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Thesis) M.Sc.

Predation by the moon snail, Polinices lewisii (Gould), on the littleneck clam, Protothaca staminea (Conrad)

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1980
Document type: 
Thesis
File(s): 
Senior supervisor: 
E.B. Hartwick
Department: 
Science: Department of Biology
Thesis type: 
(Thesis) M.Sc.

Biology of the western black-legged tick, Ixodes pacificus (Cooley and Kohls, 1943) : a potential vector of Lyme disease in south coastal British Columbia

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1992
Document type: 
Thesis
File(s): 
Senior supervisor: 
P. Belton
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Thesis) Master of Pest Management

Visual cover and site selection by mule deer

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1991
Document type: 
Thesis
File(s): 
Senior supervisor: 
A.S. Harestad
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Thesis) M.Sc.

Methylmercury uptake from water and food by aquatic organisms from different trophic levels. --

Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1974
Document type: 
Thesis
File(s): 
Senior supervisor: 
G.H. Geen
Department: 
Science: Department of Biological Sciences
Thesis type: 
Thesis (M.Sc.)

Effects of environmental and physiological factors on the acoustic behavior of Aedes aegypti (L.) (Diptera: Culicidae). --

Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1974
Document type: 
Thesis
File(s): 
Senior supervisor: 
P. Belton
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Dissertation) Ph.D.

A study of the pancreatic islets and zinc toxicity in the rainbow trout, Salmo gairdneri Richardson

Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1980
Document type: 
Thesis
File(s): 
Senior supervisor: 
B.A. McKeown
Department: 
Science: Department of Biological Sciences
Thesis type: 
Thesis (M.Sc.)

Genetic studies on the gene coding for paramyosin in Caenorhabditis elegans unc-15 and the adjacent region

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1979
Document type: 
Thesis
File(s): 
Senior supervisor: 
D.L. Baillie
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Dissertation) Ph.D.

The effects of water temperature on oviposition and other aspects of the life history of Aedes Aegypti (L.) and Culex Pipiens L.

Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1978
Document type: 
Thesis
File(s): 
Senior supervisor: 
P. Belton
Department: 
Science: Department of Biological Sciences
Thesis type: 
Thesis (M.Sc.)

Hydrostatic pressure in relation to the synchronous culture of algae in open and closed systems.

Author: 
Peer reviewed: 
No, item is not peer reviewed.
Date created: 
1968
Abstract: 

Chlorella ellipsoidea cultured using conventional methods under a 14: 10 light-dark regime in Bai j eririck ' s medium at 25?+ 1?with 700 ft-c illumination resulted in synchronous division with an n number of 4. Under identical conditions of light intensity, temperature, culture medium, and light-dark regime but in a closed system which was designs to study the effects of hydrostatic pressure on synchronous algae cultures, synchronous cell division did not occur and the n number was 2 or less at 1 atm. The most significant difference in the culture conditions arises because the concentrations of dissolved gases (mainly CCu and O^) remain relatively constant throughout the growth cycle in the open system while the gases vary in concentration continuously during the cycle in the closed system. In the closed system C>2 increases continuously c?CO-p decreases during the light period; the reverse is true in the dark. Analyses of the rati.os of dry weight, protein content, and cell size showed increases of approximately 2 in the closed system and 4 in the open system. The intent of this study was to determine effects of hydrostatic pressure on the physiology and morphology of algae. Therefore it was essential to develop techniques for successful culture in a closed system. Various modifications of culture conditions were made in attempts (only partially successful) to obtain equal growth in the two systems. 11 The effects of variations in some environmental parameters on the n number, dry weight, protein concentration, and cell size in the open and closed systems were investigated. With varied growing conditions of light intensity (15-700 ft--c), light- dark regimes (14: 10, 16: 8, 18: 6, 6: 18, 8: 16, 10: 14), media (Beijerinck, Burr, Sorokin, Tamiya and Morimura, and Beijerinck's modified with bicarbonate), CC^ concentration (0-100% saturation), and the addition of organic substances (glycolate, ascorbate, dithiothreitol) the n number and the ratios of increase in the other growth criteria were 4 in the open system but never more than 2 in the closed system. The n number and ratios of increase in dry weight, protein content and cell size were 4 in the open system at atmospheric Cu concentration but only 2 or less at high 02 (50 and 95%) concentration. These results indicate that high C>2 is probably responsible for the descrepancies in the n number and the rEitios of increase of the other criteria between the open and closed systems. Photosynthetically evolved 0^ in the closed system during the light period appears to be sufficient to induce this Warburg Effect. It was hypothesized that the Warburg Effect is responsible for the observed differences in increases in the growth criteria in the open and closed systems. Experiments were carried out to determine if photosynthetically evolved 02 was inhibiting cell growth. Using the Biological Oxygen Monitor algal samples were exposed to ? concentrations varying from 0 to 100% saturation at 25?with 700 ft-c Ill illumination. On the basis of these results which have indicated a decrease in the relative rates of O^ evolution at high 02 concentrations, it was concluded that Op evolved in the closed system could be responsible for the inhibition of photosynthesis. Synchronous growth under pressure has not yet been obtained. However, pressure effects on cell division were investigated. The n number was 4 in cells dividing while exposed to pressures of up to 200 atm, but pressures above 335 atm completely inhibited cell division. A possible mutagenic effect of pressure exposure on algal cells was considered.

Document type: 
Thesis
File(s): 
Senior supervisor: 
William Vidaver
Department: 
Science: Department of Biological Sciences
Thesis type: 
(Dissertation) Ph.D.