Index Catalog // ScholarsArchive@OSU

The role of ethylene in ectomycorrhiza formation and Fusarium infection of Douglas fir roots

Creator:: Graham, James Herbert
Abstract:: The ectomycorrhizal fungi Cenococcum geophilum, Hebeloma crustuliniforme and Laccaria laccata produced ethylene in vitro in modified Melin-Norkrans liquid medium only if amended with 2.5 to 10 mM methionine; Pisolithus tinctorius failed to produce ethylene unless the cultures were renewed with fresh methionine-amended medium prior to ethylene assay. An additional 19...
Resource Type:: Dissertation
Full Text:: Fusarium Infection of Douglas-Fir Roots AN ABSTRACT OF THE THESIS OF James Herbert Graham, Jr. for the

Racial variation in seedling development of Douglas fir, Pseudotsuga menziesii (Mirb.) Franco

Creator:: Owen, Herbert Elmer, 1925-
Resource Type:: Dissertation
Full Text:: MENZIESII { MIRB.) FRANCO by HERBERT ELMER OWEN, JR. A THESIS submitted to OREGON STATE COLLEGE

Certain factors affecting establishment of the Douglas fir (Pseudotsuga taxifolia (Lamb.) Britt.) seedlings

Creator:: Owen, Herbert Elmer, 1925-
Resource Type:: Masters Thesis
Full Text:: by Herbert Elmer Owen, Jr. A THESIS submitted to OREGON STATE COLLEGE in partial

Variation in metabolism, thallus characteristics, and water relations of three populations of Loboria pulmonaria from western Oregon

Creator:: Neil, Garry Allen
Abstract:: A physio-ecological study of Lobaria pulmonaria (L. ) Hoffm. was done to determine if geographic variation occurred within the species. Lobaria pulmonaria was collected from Table Mountain, Oak Creek, and Lost Prairie, located in the Coast Range, Willamette Valley, and Cascade Range respectively in Western Oregon. During 1971 and 1972...
Resource Type:: Masters Thesis
Full Text:: POPULATIONS OF LOBARIA PULMONARIA FROM WESTERN OREGON Abstract approved: Redacted for Privacy Iona) B

Forest vegetation and soils of terraces and floodplains along the McKenzie River, Oregon

Creator:: Hawk, Glenn M.
Abstract:: A study of the McKenzie River floodplains, terraces and glacial outwash plains was undertaken to classify and describe the vegetation and soils of a previously little studied synecological unit. During the summer of 1971, 54 analytic vegetation and soil plots (stands) were studied. Cover and frequency of all trees, shrubs,...
Resource Type:: Masters Thesis
Full Text:: PrivacyAbstract approved: Dona B. Zobl A study of the McKenzie River floodplains, terraces and glacial outwash

Taxonomy and ecology of Mentzelia mollis Peck and related species

Creator:: Glad, Judith B.
Abstract:: A study was made to clarify the relationships of Mentzelia mollis Peck and two poorly understood taxa of Mentzelia (Loasaceae) to the other members of the genus, its sections, and its subsections, and to describe the general ecology of each taxon. Within the genus, the section Trachyphytum is characterized by...
Resource Type:: Masters Thesis
Full Text:: species AN ABSTRACT OF THE THESIS OF JUDITH B. GLAD for the degree MASTER OF SCIENCE (Name of student

Requirement for the growth and maintenance of Alphanizomenon flos-aquae in culture

Creator:: O'Flaherty, Larrance Michael
Abstract:: Aphanizomenon flos-aquae from Upper Klamath Lake, Oregon was introduced into culture in a precipitate -free medium developed by modification of McLachlan's ASM medium. This medium ASMT No. 8 contained no organic substances other than ethylendiaminetetraacetate (EDTA) and Trishydroxymethylamino methane (Tris), and was developed by modifying the concentrations of certain elements,...
Resource Type:: Masters Thesis
Full Text:: sodium bicarbonate and a 1/25 dilution of Arnon's trace element solutions B and C. Cultures of

Simulation of population changes of western dwarf mistletoe on Ponderosa pine

Creator:: Strand, Mary Ann Sall, 1945-
Abstract:: Western dwarf mistletoe (Arceuthobium campylopodum Engelm. 1. campylopodum) is a parasite of ponderosa pine (Pinus ponderosa Laws. ). The objectives of this investigation are: (a) to formulate a mathematical description of the process of dwarf mistletoe disease spread in a pine forest, (b) to use this description to predict the...
Resource Type:: Dissertation
Full Text:: formulate a mathematical description of the process of dwarf mistletoe disease spread in a pine forest, (b

Degradation of phenolic components of Douglas-fir bark by fungi

Creator:: Ross, William David, 1937-
Resource Type:: Dissertation
Full Text:: -milled sclereid lignin in liquid culture. B. betulina caused darkening of condensed tannins in cultured

Ultrastructure of dormant and germinating conidia of Aspergillus nidulans

Creator:: Florance, E. R.
Abstract:: The cell wall of dry, dormant conidia of Aspergillus nidulans is three-layered. The wall of hydrated conidia is five-layered and the germ tube wall is continuous with the innermost layer. The outermost layer consists of rodlets measuring 10 nm in diameter. Mitochondria and endoplasmic reticulum increase in number and amount,...
Resource Type:: Masters Thesis
Full Text:: Head elf Depar, cT ent of B ny and Plant Pathology Redacted for privacy Dean of Graduate School Date

Characterization of two endopolygalacturonase isozymes produced by Fusarium oxysporum f. sp. lycopersici

Creator:: Strand, Larry L.
Abstract:: Polygalacturonase produced by Fusarium oxysporum f. sp. lycopersici was purified by chromatography on DEAE cellulose, CM cellulose, and hydroxylapatite. Removal of large amounts of carbohydrate by chromatography on hydroxylapatite did not affect heat stability of the enzyme. A large proportion of the remaining carbohydrate appeared to be covalently linked to...
Resource Type:: Dissertation
Full Text:: Stratton for Larry L. Strand ACKNOWLEDGMENTS I wish to thank Helen Gehring for abundant technical

Phenotypic variation in diploid and tetraploid populations of Claytonia perfoliata (s.l.) (Portulacaceae)

Creator:: Miller, John M.
Abstract:: Meiotic chromosome counts from 200 populations of Claytonia (Montia) perfoliata (sensu lato) reveal a polyploid pillar complex based on three morphologically different, chemically distinct, and geographically defined diploids. The basic chromosome number is x=6. Diploid C. perfoliata Willdenow with linear juvenile leaves and deltoid mature basal leaves ranges southeastward from...
Resource Type:: Dissertation
Full Text:: presented March 29, 1978 Typed by Mary Jo Stratton for John M. Miller ACKNOWLEDGEMENTS I wish to convey

Ascocarp development in Anthracobia melaloma

Creator:: Larsen, Harold J.
Abstract:: Cultural and developmental characteristics of a collection of Anthracobia melaloma with a brown hymenium and a barred exterior appearance were examined. It grows well in culture on CM and CMMY agar media and has a growth rate of 17 mm in 18 hours. It is heterothallic and produces asexual multinucleate...
Resource Type:: Masters Thesis
Full Text:: Graduate School Date thesis is presented Typed by Mary Jo Stratton for Harold Julius Larsen, Jr

Non-random labelling of geraniol biosynthesized from ¹⁴Co₂ in Pelargonium graveolens

Creator:: Wuu, Ta-yun
Abstract:: The acyclic monoterpene geraniol was biosynthesized from ¹⁴CO₂ in Pelargonium graveolens (rose geranium) and isolated from the hexane-extractable fraction in five experiments. Experiments 1 and 2 were preliminary experiments in which the total incorporation of label into geranium oil was determined. In experiments 3 and 4a and 4b both incorporation...
Resource Type:: Masters Thesis
Full Text:: School Date thesis is presented Typed by Mary Jo Stratton fo Ta-Yun Wuu ACKNOWLEDGEMENTS I express

Effects of near-ultraviolet radiation on changes in the biochemical composition of Verticillium albo-atrum

Creator:: Madarash, George Russell
Abstract:: This study sought a better understanding of the mechanism of the near-ultraviolet inhibition of microsclerotia and pigment formation in the fungus Verticillium albo-atrum Reinke & Berth. by observing changes which occur in certain major biochemical components: lipids, chitin, RNA, DNA, protein carbohydrates, and pigment. The most important finding was that...
Resource Type:: Masters Thesis
Full Text:: Graduate School Date thesis is presented May 20, 1969 Typed by Mary Jo Stratton for George Russell

Survival of Phytophthora lateralis in an organic matter fraction of the soil

Creator:: Ostrofsky, William Dow
Abstract:: Chamaecyparis lawsoniana, an extremely valuable timber tree species, is highly susceptible to a serious, soil -borne root disease caused by Phytophthora lateralis. Disease outbreaks of epidemic proportions are continually causing high mortality in natural stands of the host tree. Practical control measures rely on an understanding of the many factors...
Resource Type:: Masters Thesis
Full Text:: presented December 12, 1975 Typed by Mary Jo Stratton for William Dow Qstrofsky ACKNOWLEDGEMENTS I wish

Taxonomy and host specificity of the genus Agrobacterium

Creator:: Anderson, Arthur Robert
Abstract:: One hundred seventy-eight Agrobacterium isolates, 120 United States (U.S.), 26 Australian and 32 of miscellaneous origin, were characterized for their reactions to 20 biochemical and physiological tests. Isolate pathogenicity and degree of host specificity, utilization of nopaline and octopine, and sensitivity to agrocin-84 also were determined. The U.S. isolates were...
Resource Type:: Dissertation
Full Text:: , 1977 Typed by Mary Jo Stratton for Arthur Robert Anderson ACKNOWLEDGEMENTS I wish to extend my

Chemical applications for control of armillaria root rot of Ponderosa pine

Creator:: Filip, Gregory M.
Abstract:: Root rot caused by Armillariella mellea creates roughly circular disease centers of infected dead and dying trees in the younggrowth ponderosa pine forest under study. Research objectives concerning chemical control of the disease were: 1) to test the effectiveness of certain chemicals in protecting living pines adjacent to disease centers...
Resource Type:: Dissertation
Full Text:: Graduate School Date thesis is presented March 10, 1976 Typed by Mary Jo Stratton for Gregory M. Filip

An experimental taxonomic study of a northwest American polyploid species, Scrophularia lanceolata pursh

Creator:: Carlbom, Curt Gerald, 1932-
Resource Type:: Masters Thesis
Full Text:: of their F 1 hybrids, (B and C). 18 2 F 1 hybrid of subspecies lanceolata (4- Corvallis) X

The effects of univalent cations on the inductive formation of nitrate reductase

Creator:: Nitsos, Ronald Eugene
Abstract:: An investigation was undertaken to determine whether potassium is indeed necessary for the in vivo synthesis of a specific protein. The effects of univalent cations on the inductive formation of nitrate reductase and on the level of activity of representative non-adaptive enzyme are presented. Cultures of Neurospora crassa were grown...
Resource Type:: Masters Thesis
Full Text:: 2, considerable +> a> •H u a B 600- 400- 200 28 FIG. 1. Comparison of the effects of

Characteristics of the enzyme system responsible for melanin formation in verticillium

Creator:: MacMillan, Paul Carver
Abstract:: This paper describes an attempt to ascertain the enzyme system responsible for melanin formation in a melanin-and-microsclerotia-forming strain of Verticillium albo-atrum Reinke and Berth. Previous work showed that near-UV radiation (3200-400 A⁰) inhibits melanin synthesis and microsclerotia development in this strain and that catechol almost wholly reverses this inhibition. During...
Resource Type:: Masters Thesis
Full Text:: sted below) Distilled'Water (b)'r Ki:r-Po4 Di stilled Water Fe(NO3)3 . 9 }{zo ZnSO4' 7 H2O MnSO4

The genus Trichopezizella

Creator:: Haines, John Haldor, 1938-
Abstract:: A taxonomic study of the genus Trichopezizella Raitviir is presented. T. nidulus var. nidulus, T. horridula, T. barbata, and T. relicina var. relicina are fully described and figured. Three provisional combinations are made: T. nidulus var. hystriculus, T. nidulus var. setigera, and T. relicina var. macrospora. T. onocleae and T....
Resource Type:: Dissertation
Full Text:: thesis is presented Typed by Mary Jo Stratton for ,John.Haldor Haines ACKNOWLEDGMENTS The author

Initiation and spread of footrot of wheat caused by Cercosporella herpotrichoides

Creator:: Rowe, Randall Charles
Abstract:: Footrot of wheat (Cercosporella herpotrichoides Fron) is a major disease of winter wheat in certain areas of the world having a cool, damp winter and early spring climate. In Oregon, it is an economic problem in the higher rainfall wheat-growing areas in the eastern portion of the state. This study...
Resource Type:: Dissertation
Full Text:: of Graduate School Date thesis is presented June 20, 19 Typed by Mary Jo Stratton for Randall

A study on the carotenoids of wild-type and mutant strains of the alga, Scenedesmus obliquus

Creator:: Williams, Janet Lynn
Abstract:: The primary objective of this thesis is to study, characterize and compare four types of Scenedesmus obliquus pigment mutants with the wild-type strain. The specific nature of the carotenoids synthesized in both heterotrophically and myxotrophically-grown cells, Hill reaction activity, photoreduction activity, and total photosynthetic activity of these cells are examined....
Resource Type:: Masters Thesis
Full Text:: thesis is presented Typed by Mary Jo Stratton for Janet Lynn Williams TABLE OF CONTENTS Page I

The developmental cytopathology of Prunus persica Batsch. and P. avium L. infected with X-disease and Albino disease respectively

Creator:: Florance, E. R.
Abstract:: In 1967, Doi et al. proposed the hypothesis that 'yellows type diseases' are caused by mycoplasma. Since then more than 60 yellows diseases have been associated with mycoplasma-like bodies (MLB) (Maramorosch, 1973). The majority of these associations are based upon electron microscopic observations of mycoplasma-like bodies in situ. However, little...
Resource Type:: Dissertation
Full Text:: Stratton for Edwin R. Florance ACKNOWLEDGEMENTS I wish to acknowledge the aid and helpful suggestions

Ascospore discharge and germination in Xanthoria polycarpa

Creator:: Ostrofsky, Andrea
Abstract:: Xanthoria polycarpa is a foliose lichen, commonly found as an epiphyte in the Willamette Valley of western Oregon. This study was undertaken to determine some of the effects of environmental factors on ascospore discharge and germination in X. polycarpa. Ascospores were collected on glass slides suspended above lichen thalli. Abundant...
Resource Type:: Masters Thesis
Full Text:: 0 Date thesis is presented %e' Typed by Mary Jo Stratton for Andrea Ostrofsky THIS THESIS IS

A compound from onion roots inhibitory to Pyrenochaeta terrestris

Creator:: Pfleger, Francis Louis
Abstract:: In vitro tests showed mycelial growth of Pyrenochaeta terrestris was inhibited by root and bulb extracts from the pink root resistant onion cultivar Nebuka, but not by extracts from the susceptible Southport White Globe. The active principle was shown to be fungistatic rather than fungicidal. It is present in both...
Resource Type:: Dissertation
Full Text:: Mary Jo Stratton for Francis Louis Pfleger ACKNOWLEDGMENTS The author wishes to express his sincere

Partial purification and determination of some properties of an aminotransferase of pea (Pisum sativum L.) plants

Creator:: Matheron, Michael Earl
Abstract:: A transaminase (aminotransferase, EC 2. 6. 1) was extracted and purified approximately 148-fold from shoot tips of pea (Pisum sativum L. cv. Alaska) seedlings and some properties of the enzyme were determined. The purification included acetone precipitation followed by column chromatography on hydroxylapatite. With a-ketoglutarate as co-substrate, the acetone precipitated...
Resource Type:: Masters Thesis
Full Text:: Privacy Dean of Graduate SchOol Date thesis is presented /4/-27/72_ Typed by Mary Jo Stratton for

The influence of environment and pathogen variability on the infection of wheat by Puccinia striiformis West

Creator:: Beaver, Richard Gary, 1939-
Abstract:: Race identification of stripe rust (Puccinia striiformis West. ) is influenced by environment, pathogen variability and host age. Isolates of stripe rust were collected in the Pacific Northwest and characterized on two sets of differential varieties; the "Oregon" and the United States. Six of the seven isolates tested on the...
Resource Type:: Dissertation
Full Text:: School Date thesis is presented p--.6)- 7/ Typed by Mary Jo Stratton for Richard Gary Beaver

Effects of cork bark disease on cambial activity and secondary tissues in Abies lasiocarpa (Hook.) Nutt

Creator:: Carr, John Edward, 1943-
Abstract:: Abies lasiocarpa (Hook.) Nutt. (sub-alpine fir) trees of comparable vigor growing in eastern British Columbia were studied in order to determine the effects of cork bark disease on phellogen and vascular cambium activity. Diseased trees form hard deeply fissured rhytidome several inches thick over large areas of the bole when...
Resource Type:: Dissertation
Full Text:: presented Typed by Mary Jo Stratton for John Edward Carr ACKNOWLEDGEMENTS I would like to express my

Light and electron microscopy of chloroplasts in Equisteum gametophytes

Creator:: Hook, Patricia Waynette, 1941-
Abstract:: Spores of Equisetum were germinated and the resulting gametophytes grown to maturity in standard microcultures. Light and electron microscope observations were made of the chloroplasts within the gametophytes. These chloroplasts were found to be oval to dumb-bell shaped organelles possessing organized grana. By means of time-lapse movies they were shown...
Resource Type:: Dissertation
Full Text:: : Redacted for Privacy Associate Professor of Botany Redacted for Privacy Head of partment of B Redacted

Inactivation of Verticillium dahliae in peppermint stems by propane gas flaming

Creator:: McIntyre, John Lee
Abstract:: The fungus Verticillium dahliae Kleb. causes a wilt disease of peppermint, Mentha pipertita L. Propane flaming of peppermint stubble is widely used to control Verticillium wilt in the Willamette Valley of Oregon, but little is known about the temperature required for effective control of the fungus. The purposes of this...
Resource Type:: Masters Thesis
Full Text:: Typed by Mary Jo Stratton for John Lee McIntyre ACKNOWLEDGEMENTS I wish to thank Dr. C. E. Horner

A comparison of the effects of thiourea and formamidine disulfide on the growth of resting tubers of Solanum tuberosum

Creator:: Couey, Harold Melvin
Resource Type:: Masters Thesis
Full Text:: ) Thiourea is a catalyst in the oxidation of suifhydryl compounds by hydrogen peroxide, possibly b virtue

Some macrophytic, intertidal algal associations on the coast of Oregon

Creator:: Gill, Gary Lawlor
Abstract:: Two sampling lines were established in the intertidal region at each of three geographically separate sites on the coast of Oregon. Each sampling line, which was positioned in the zone dominated by the brown alga Hedophyllum sessile, was one meter in height and extended 50 meters horizontally. Information was sought...
Resource Type:: Masters Thesis
Full Text:: Mary Jo Stratton for Gary Lawlor Gill ACKNOWLEDGEMENTS The faculty member with whom I first had

Biology of symbiotic fungi associated with Ambrosia beetles of western United States

Creator:: Roeper, Richard Allen
Abstract:: Eight primary ambrosia fungi, Raffaelea canadensis, R. sulcati, Ambrosiella brunnea, A. ferruginea, A. gnathotrichi, A. hartigii, A. sulcati, and A. sulphurea (Fungi Imperfecti), were found in association with 11 ambrosia beetle species (Scolytidae and Platypodidae). The fungi are reported from new beetle symbionts, new tree hosts, and/or increased geographical distribution....
Resource Type:: Dissertation
Full Text:: -) Typed by Mary Jo Stratton for Richard Allen Roeper ACKNOWLEDGEMENTS I wish to acknowledge the aid

Growth and sporulation of Phytophthora lateralis in vitro as influenced by the chemical and physical environment

Creator:: Englander, Larry
Abstract:: Phytophthora lateralis Tucker and Milbrath, causal agent of a serious fungus root rot of Chamaecyparis lawsoniana, has seriously damaged natural stands in southwestern Oregon forests and affected ornamentals throughout the Pacific Northwest. Progress with an effective control program in the field has been limited by lack of critical knowledge of...
Resource Type:: Dissertation
Full Text:: De6/rtment of B Of any and Plant Pathology Redacted for Privacy Dean of Graduate School Date thesis

Salinity as a factor controlling the distribution of benthic estuarine diatoms

Creator:: Martin, John Varick
Abstract:: A two phase investigation was undertaken in an attempt to determine the effects of variations in salinity on the distribution of benthic estuarine diatoms. The estuary studied was that of the Yaquina River which originates in the Coast Range of western Oregon and discharges into the Pacific Ocean at the...
Resource Type:: Dissertation
Full Text:: of Graduate School Date thesis is presented April 24. 1970 Typed by Mary Jo Stratton for John

Certain ecological aspects of cultivated hill pastures in Kings Valley, Oregon

Creator:: Miller, Bonita June
Resource Type:: Masters Thesis
Full Text:: . To my parents, Mr. and Mrs. Herbert Miller, who have providéd me with material as',istance and

Fruit bud development and gametogenesis in Pistacia vera L

Creator:: Jones, Leo Edward
Resource Type:: Dissertation
Full Text:: . B. K., which grows in the southwestern rec4ons of the United States and in ex- ico. Other well

Some aspects of the autecology of Aphanizomenon flos-aquae Born. et Flah. studied under cultural conditions

Creator:: McLachlan, J. L. (Jack Lamont), 1930-
Resource Type:: Dissertation
Full Text:: organisms (60, p . S) . B. Modern Cultural Procedures 1. General Con s iderations In general, algal

Some factors controlling the establishment and distribution of Quercus agrifolia Nee and Q. engelmannii Greene in certain southern California oak woodlands

Creator:: Snow, Gerald Eldon
Abstract:: The structure of two oak woodland types in the Santa Rosa region of the Santa Ana Mountains of southern California has been described by Zuill (1967). One type called the grass oak woodland (GOW) is composed mainly of Q. engelmannii on hills and slopes. The other type called the dense...
Resource Type:: Dissertation
Full Text:: Graduate School Date thesis is presented August 31, 1972 Typed by Mary Jo Stratton for Gerald Eldon Snow

Variation in, and the effects of vitamins on Verticillium albo-atrum

Creator:: Roth, Jonathan Nicholas
Resource Type:: Dissertation
Full Text:: were glucose - nitrate basal liquid (M), M plus 5 pg of biotin /liter of medium (B), M plus 100 pg

An illustrated key to the ferns of Oregon

Creator:: Pembrook, Helen Patricia O'Donahue
Abstract:: The purpose of the work is to enable students of botany to identify accurately Oregon ferns, both as living plants and as dried specimens. Therefore, it provides vegetative keys to the families, genera and species of the ferns (Class FILICINAE) found in Oregon. Correct names have been determined using the...
Resource Type:: Masters Thesis
Full Text:: (tertiary rachis or axis) 13. Terminal segment B. Blade dissection 14. 1- pinnate 15. Pinnate

The distribution of intertidal diatoms associated with the sediments of Yaquina Estuary, Oregon

Creator:: Amspoker, Michael C.
Abstract:: Sediment samples were collected from eight sampling sites along the Yaquina Estuary, Oregon from Yaquina Bay to Elk City near the head of the estuary. Samples were collected in November 1973, February 1974, May 1974 and August 1974 from two or three intertidal levels depending on the magnitude of the...
Resource Type:: Dissertation
Full Text:: --- \ () o)r Typed by Mary Jo Stratton for Michael Craig Amspoker Redacted for privacy Redacted for

A chemosystematic study of the phylogenetic position of Arabidopsis thaliana (L.) heynh. (Brassicaceae) employing numerical methods

Creator:: Kaplan, Hesh J.
Abstract:: The Brassicaceae, Mustard Family, is a well marked natural family, whose tetramerous flowers, tetradynamous stamens, and distinctive bi- carpellary fruits, clearly distinguish it from related families. It is a large family of some 3, 000 recognized species and over 300 genera. Although numerous attempts have been made over the past...
Resource Type:: Dissertation
Full Text:: presented April 19, 1977 Typed by Mary Jo Stratton for Hesh J. Kaplan ACKNOWLEDGEMENTS I wish to thank

Plant materials for high school biology courses

Creator:: France, Emilie Margaret
Resource Type:: Masters Thesis
Full Text:: ) another large croup of pathogenic fungi causing rots, b].ights, nd v'rioue other Injuries to our cereals

The genus Gautieria Vitt. (hymenogastrales-basidiomycetes)

Creator:: Stewart, E. L.
Abstract:: A taxonomic study of the genus Gautieria Vitt. is presented. Existing type collections were re-examined, fully described and figures. Twenty-six species are recognized. Two provisional subgenera are proposed: Gautieria and Clelandia. Within the subgenus Gautieria, two provisional sections are proposed: Gautieria and Trappea. G. morchellaeformis var. globospora, and G. morchellaeformis...
Resource Type:: Dissertation
Full Text:: b Rodent c Rodent d Rodent e Rodent f Stomach Feces °70 Stomach °7o Feces Stomach Feces Stomach

Structure and development of the bark of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco

Creator:: Grillos, Steve J.
Resource Type:: Dissertation
Full Text:: and structural components: 1. Extractives a. Approximately 9 per cent tannins b. Approximately

Disease cycle and control of peppermint rust caused by Puccinia menthae Pers

Creator:: Horner, C. E. (Chester Ellsworth), 1925-
Resource Type:: Dissertation
Full Text:: prorrntr@ Syp*d b; h,ib Erera CKHO' LEDGEMEUT The author wishes to express his appreciation to Dr

Key to the deciduous woody plants of Northwestern Oregon in winter

Creator:: Packard, Patricia Lois
Resource Type:: Masters Thesis
Full Text:: Major Head of Department of B Chairman of School Graduate Committee Dean of Graduate School Date

Synecological features of a natural headland prairie on the Oregon coast

Creator:: Davidson, Eric Duncan
Abstract:: The study of the vegetation of one of the natural coastal prairies in Oregon was undertaken for the purpose of describing some of its synecological features. Specific objectives of the study were to describe certain plant assemblages in the study area, present phenological relationships on some of the assemblages, and...
Resource Type:: Masters Thesis
Full Text:: presented b.~ l!.l~,2/t'ft.i'1./L 1} / qtb( 1 Typed by Eula Weathers for Eric Duncan Davidson

Man and the land : an ecological history of fire and grazing on eastern Oregon rangelands

Creator:: Shinn, Dean Allison
Abstract:: Ecological and historical information are combined in examining the environmental influence of fire and grazing on rangelands in eastern Oregon through time. Competitive relationships between herbaceous and woody flora in the northern Great Basin are discussed, focusing broadly on the shrubsteppe regions 'of Franklin and Dyrness (1973) but with special...
Resource Type:: Masters Thesis
Full Text:: (Continued) EXHIBITS 63 BIBLIOGRAPHY................. . • 75 APPENDIX A 83 APPENDIX B 87

Factors affecting the germination of seeds of the dwarf mistletoe Arceuthobium campylopodum f. typicum. (Engelm.) Gill

Creator:: Sayre, Richard Martin
Resource Type:: Masters Thesis
Full Text:: of the hypocotyl as for germination. 44 B IBLIOCrRPHY 1. Abbitt1, Della. Las Lorantacess

The partial purification-characterization of bean yellow mosaic virus

Creator:: Chairez, Ruben and Chairez, Ruben, 1942-
Abstract:: Factors limiting effective extraction and purification of bean yellow mosaic virus (BYMV) were investigated. Since the use of published techniques for purifying BYMV resulted in low yields of partially purified virus, an improved method for partial purification of this virus was developed. The following treatments of infectious crude extract decreased...
Resource Type:: Dissertation
Full Text:: monolaurate) and the five cationic surfactants Triton X-45, X-180, X-155, X-100, and B-1456 were obtained

The influence of quantity of inoculum on the severity of verticillium wilt

Creator:: Tolmsoff, Walter John
Resource Type:: Masters Thesis
Full Text:: incited by Verticilliuin albo-atrum which they designated types A, B and C. Foxm A first appeared in the

A contribution toward a bibliography of Oregon botany with notes on the botanical explorers of the state

Creator:: Osborn, Katherine H., 1906-
Resource Type:: Masters Thesis
Full Text:: botanic works and explorations of the North American cont±nent." p.46-92. Judson, K. B. Subject index

An investigation into the ecology and distribution of Kalmiopsis leachiana (Hend.) Rehder

Creator:: Marquis, Robert John
Abstract:: Ecological factors associated with the relictual distribution of the endemic shrub Kalmiopsis leachiana (Ericaceae) were investigated. A prostrate evergreen species with small coriaceous leaves, K. leachiana is restricted to two disjunct populations in the Siskiyou Mountains and southern Cascade Mountains of southwestern Oregon, USA. Exact distributions of individual populations were...
Resource Type:: Masters Thesis
Full Text:: Stratton for Robert John Marquis ACKNOWLEDGEMENTS I would like to express my appreciation here to those

The phytosociology of some vine maple communities in the Marys Peak watershed

Creator:: Anderson, Howard George
Abstract:: A study was undertaken in the Marys Peak watershed with the following objectives. First, a classification of the major plant communities was carried out. Second, some of the ecological features of Acer circinatum that account for its distribution within these communities were determined. The following plant communities are described: Corylus...
Resource Type:: Masters Thesis
Full Text:: Corvallis W. B. 592 44031' 123027' 68.38 39.31 107.92 Philomath 240 44032' 123020' 39.92 29.14 55.18 1

Effects of variations in salinity and temperature on some estuarine macro-algae

Creator:: Kjeldsen, Chris Kelvin
Resource Type:: Dissertation
Full Text:: respiration at 20 C resulting in rates below those at 15 C; b) rates of respiration in creased in reduced

A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

Creator:: Lint, Harold LeRoy
Abstract:: A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
Resource Type:: Dissertation
Full Text:: with parts labeled B. Basal bract types 7 Portions of culms and the upper cataphyll apices of Pacific

Factors influencing development and control of Phytophthora fragariae Hickman, the cause of red stele disease of strawberries

Creator:: Houck, Laurie G., 1928-
Resource Type:: Dissertation
Full Text:: . X100. (b) Hyphae radiating out from a large structure. X100. (c) Small structure. X 100 106 10

Contributions to the plant ecology of the Oregon coastal sand dunes

Creator:: Wiedemann, Alfred M.
Abstract:: Sand dunes are found along the coasts of most of the large land masses of the world. Because of their proximity to man and his activities, the maritime sand dunes of Europe, particularly Germany, France, Holland and Scandinavia, have the longest history of stabilization activities and botanical investigation. There are...
Resource Type:: Dissertation
Full Text:: maritima Scop., and Salsola kali L.; the foredune by an Agropyron junceum (L. ) P. B./Honckenya peploid.es

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