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Active survival of Verticillium dahliae in soil

Creator:: Martinson, Charlie Anton
Resource Type:: Dissertation
Full Text:: ACKNOW LLEDGEMENTS The author wishes to thank Dr. C. E. Homer for guidance throughout this study and

Contracting nucleolar vacuoles in somatic tobacco cells growing in microcultures

Creator:: Johnson, John Morris
Abstract:: Contracting nucleolar vacuoles are a general and consistent feature of somatic tobacco cells growing in microcultures. Nucleolar vacuoles were studied in cells from callus tissues of two single-cell clones, H-196 and H-239, of hybrid tobacco (Nicotiana tabacum X N. glutinosa). Vacuoles periodically contracted either completely or incompletely, apparently releasing a...
Resource Type:: Dissertation
Full Text:: Cha' man of epart- ent of Botany can o ra ua e c oo e ACKNOWLEDGMENTS The writer wishes to

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

Creator:: West, Neil E.
Abstract:: Montane forest vegetation as it occurs on the east flank of the central Oregon Cascades has provided excellent conditions for a "natural experiment" in the use of various methodologies in studying vegetational distribution. This "experiment" has reflected on some theory and practice for the discipline of plant synecology. Detailed descriptions,...
Resource Type:: Dissertation
Full Text:: individuals, agencies, and institutions, I owe an especial debt of gratitude. To Dr. Kenneth C. Swedberg I

Comparative gibberellin relationships in tall and dwarf peas (Pisum sativum L.)

Creator:: Anderson, James David
Abstract:: Experiments were performed to determine whether a direct correlation exists between the growth rates of tall and dwarf peas grown either in the light or in the dark and endogenous gibberellin (GA) content. Three separate but related experimental approaches were utilized: (1) the determination of possible qualitative and /or quantitative...
Resource Type:: Dissertation
Full Text:: Abstract approved: Thomas C. Moore Experiments were performed to determine whether a direct

Effects of the insecticide dieldrin on benthic algae in laboratory streams

Creator:: Rose, Frederick Louis
Abstract:: The accumulation of dieldrin and its effects on species composition of benthic algal communities were studied in laboratory streams. Effects of dieldrin on photosynthetic and respiratory rates of the blue-green alga Phormidium retzii were determined using a Gilson Differential Respirometer. Dieldrin concentrations ranging from 0.05 to 7.0 ppb were maintained...
Resource Type:: Dissertation
Full Text:: ON BENTHIC ALGAE IN LABORATORY STREAMS Abstract approved: C. David McIntire The accumulation

The effects of ultraviolet irradiation on the photosynthetic apparatus

Creator:: Mantai, Kenneth Edward
Abstract:: The effects of ultraviolet (UV) irradiation on photosynthesis and various partial reactions involving the individual photoreactions of photosynthesis were examined. These reactions included photo-reduction in adapted green algae, Hill reaction, cyclic photophosphorylation, the 520 nm absorbance change and variable-yield fluorescence. The reactions were measured in spinach chloroplasts and isolated chloroplasts...
Resource Type:: Dissertation
Full Text:: . 2. The effects on Hill reaction (cytochrome c reduction) 64 of adding PQ or vitamin K1 to

Anatomical changes in the secondary phloem of grand fir (Abies grandis (Dougl.) Lindl.), induced by the balsam woolly aphid (Adelges piceae Ratz.)

Creator:: Saigo, Roy Hirofumi
Abstract:: The balsam woolly aphid (Adelges piceae Ratz.) feeds by inserting its stylets intra- and intercellularly into the cortex or outer phloem of the true firs. While feeding, the aphid injects into the bark an unknown stimulatory substance which affects the adjacent cortical parenchyma cells, the activity of the vascular cambium...
Resource Type:: Dissertation
Full Text:: . Forest Service for its financing of this project and to Dr. R. G. Mitchell for his personal concern

Distribution of understory species in relation to maximum and minimum tree influence in the montane forest of the Central Oregon Cascades

Creator:: Robinson, Andrew Frederick, Jr.
Abstract:: Twenty sites of uniform topography and soil were select ed in the montane forest found on the East flank of the Central Oregon Cascades. These sites were located along a vegetational gradient composed of five plant communities: Abies/Pachistima, Pinus/Ceanothus, Pinus Arctostaphylos-Purshia, Pinus/Purshia/Festuca, and Juniperus Festuca. An attempt was made to...
Resource Type:: Dissertation
Full Text:: determined by hierarchial classification. 9 Four species which show highest correlation with factor C

Morphology, physiology and pathogenicity of Trichoconis padwickii Ganguly, the cause of Stackburn disease of rice

Creator:: Chuaiprasit, Chalermlarb
Resource Type:: Dissertation
Full Text:: range of 10-34 C and sporulated be- tween 12-32 C. Optimum temperatures for growth were 26-28 C and

Vegetative ecology of a montane mire, Crater Lake National Park, Oregon

Creator:: Seyer, Susan C.
Resource Type:: Masters Thesis
Full Text:: Graduate School Date thesis is presented December 14, 1979 Typed by Susan C. Seyer for Susan Cornelia

ScholarsArchive@OSU

Active survival of Verticillium dahliae in soil

Contracting nucleolar vacuoles in somatic tobacco cells growing in microcultures

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

Comparative gibberellin relationships in tall and dwarf peas (Pisum sativum L.)

Effects of the insecticide dieldrin on benthic algae in laboratory streams

The effects of ultraviolet irradiation on the photosynthetic apparatus

Anatomical changes in the secondary phloem of grand fir (Abies grandis (Dougl.) Lindl.), induced by the balsam woolly aphid (Adelges piceae Ratz.)

Distribution of understory species in relation to maximum and minimum tree influence in the montane forest of the Central Oregon Cascades

Morphology, physiology and pathogenicity of Trichoconis padwickii Ganguly, the cause of Stackburn disease of rice

Vegetative ecology of a montane mire, Crater Lake National Park, Oregon

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