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Filtering by: Creator Oldroyd, H. J. Remove constraint Creator: Oldroyd, H. J. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Decade 1960-1969 Remove constraint Decade: 1960-1969

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  • Physiology of senescence of the shoot apex in Pisum sativum L.

    Creator:
    Ecklund, Paul Richard, 1941-
    Abstract:
    Shoot apex senescence is defined as the collective progressive and deteriorative processes which ultimately terminate the functional life of the shoot apex. Senescence of shoot apices of Pisum sativum L. 'Alaska' as measured by cessation of stem elongation was delayed by removal of flowers and by treatment with gibberellin A₃...
    Resource Type:
    Dissertation
    Full Text:
    also expressed to Drs. H. J. Evans, F. H. Smith and R. R. Becker for their service on my committee

  • Some properties of ribonucleotide reductase in Rhizobium species

    Creator:
    Cowles, Joe Richard, 1941-
    Abstract:
    Ribonucleotide reductase from Rhizobium meliloti has been partially purified and characterized. The enzymatic reduction of ribonucleotides to deoxyribonucleotides is dependent upon B₁₂ coenzyme and dihydrolipoate. B₁₂ coenzyme was more effective than B₁₂ coenzyme analogues in the reductase reaction. The affinity of the R. meliloti reductase system for B₁₂ coenzyme was...
    Resource Type:
    Dissertation
    Full Text:
    J. Reed, Leo W. Parks, and Ronald H. Alvarado, members of my graduate commit- tee, for their

  • Bionomics of the hop cyst nematode, Heterodera humuli Filipjev, 1934 (Nematoda : Heteroderidae)

    Creator:
    Sen, Arun Kumar
    Abstract:
    The hop cyst nematode, Heterodera humuli Filipjev, 1934 was first reported from Europe in 1894, however, very little is known with respect to the biology and economic importance of this pest. Abundant material from Oregon hop yards provided an excellent opportunity to add additional details concerning the bionomics of this...
    Resource Type:
    Dissertation
    Full Text:
    ) Abstract approved: Dr. Harold J. Jensen The hop cyst nematode, Heterodera humuli Filipjev, 1934 was

  • Anatomical studies of Pinus ponderosa Laws : infested by Elytroderma deformans (Weir) Darker

    Creator:
    Wirtz, Felicia Pietrykowski
    Abstract:
    Pine needle blight of Pinus ponderosa Laws. caused by Elytroderma deformans (Weir) Darker is recognized by changes in the needles, in the bark and in the development of the branches. Anatomical studies of the host-parasite relation have been made previously on young pine tissue up to four years of age...
    Resource Type:
    Dissertation
    Full Text:
    Umatilla NF Wallowa -Whitman NF Colville Okanogan NF Wenatchee L. Gill J. H. Faull J. Pernot J

  • The culture and biochemical analysis of some estuarine phytoplankton species

    Creator:
    DeMort, Carole Lyle
    Abstract:
    The biochemical composition of ten species of estuarine phytoplankton was determined. Studies were made of their growth in various culture media and of their relative value as food for oyster larvae. Nine of the species were isolated from Yaquina Bay, Oregon. An attempt was made to select species which commonly...
    Resource Type:
    Dissertation
    Full Text:
    Biochemical Analysis of Some Estuarine Phytoplankton Species Abstract Approved: H. K. Phinney The

  • Benthic algal communities of the Metolius River

    Creator:
    Sherman, Barbara Jane Powell, 1938-
    Abstract:
    Samples of benthic algae were collected from the Metolius River of central Oregon at two-week intervals between April 15, 1967 and March 9, 1968. Species of filamentous algae and diatoms present were recorded for every sampling station on each sampling date. Permanent mounts of diatom frustules were prepared. This sampling...
    Resource Type:
    Dissertation
    Full Text:
    appreciation to my major professor, Doctor H. K. Phinney, for his assistance and encourage- ment during the

  • Comparative wood anatomy of the Fagaceae of Taiwan

    Creator:
    Lee, Chun-shu
    Abstract:
    Many species of the Fagaceae have been variously interpreted on the basis, primarily of external morphological characteristics. The objectives of this study are to elucidate generic and specific characteristics of the wood of Fagaceae and to attempt to obtain evidence regarding taxonomic relationships among some of the species occurring in...
    Resource Type:
    Masters Thesis
    Full Text:
    OF TAIWAN Abstract approved Frank H, Smith Many species of the Fagaceae have been variously

  • 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:
    Frank H. Smith The balsam woolly aphid (Adelges piceae Ratz.) feeds by inserting its stylets intra

  • Comparative anatomical study of three species of Microseris

    Creator:
    Soedjono, Estiti Harti
    Abstract:
    Three growth forms of the genus Microseris, of the tribe Cichorieae, family Compositae, were compared with respect to their anatomical structure. The purpose of this study was to clarify lines of evolutionary specialization in the genus. Two of the three species studied, M. laciniata and M. borealis, are perennials, while...
    Resource Type:
    Dissertation
    Full Text:
    ) (Name) (Degree) (Major) Date thesis is presented__~r:F===..::J~-.u.L___,__.:./-l'f:....;;;~-lfl

  • Seasonal pattern of secondary growth in stems of northern white spruce (Picea glauca (Moench) Voss)

    Creator:
    Gregory, Robert A.
    Abstract:
    Cambial activity in white spruce stems in Alaska was observed from April, 1964 to September, 1965 in over 300 samples taken from 50- to 60-year-old natural stands. Mitotic index was used as a measure of the rate of periclinal division of fusiform cells in the cambial zone. Anticlinal divisions are...
    Resource Type:
    Dissertation
    Full Text:
    ) VOSS)) Abstract approved: Redacted for privacy Frank H. Smitn. Cambial activity in white spruce