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Community profiles of ammonia oxidizers across high-elevation forest-to-meadow transects

Creator:: Mintie, Ann
Abstract:: In recent years considerable interest has been shown in the diversity of ammonia-oxidizing bacteria in soil communities. The majority of the research has been carried out in Northern Europe where soils have received high atmospheric inputs of nitrogen over the past two centuries. In contrast, although much work has been...
Resource Type:: Masters Thesis
Full Text:: Oxidizers Across High-Elevation Forest-to- Peter J. Bottomley In recent years considerable interest has

Episodic dynamics of microbial communities associated with the birth and death of ectomycorrhizal mats in old-growth Douglas-fir stands

Creator:: Blanchard, Joseph H.
Abstract:: Ectomycorrhizal (ECM) fungi of the genera Piloderma and Ramaria form dense hyphal mats in the organic and upper mineral soil layers, respectively, in coniferous forest floors of the Pacific Northwest. Previous studies have determined that fungal mats change the chemical, physical, and biological properties of the soil within. Little information...
Resource Type:: Masters Thesis
Full Text:: : _____________________________________________________________________ Peter J. Bottomley Ectomycorrhizal (ECM) fungi of the genera Piloderma and Ramaria form

Characterization of indigenous Rhizobium leguminosarum bv. trifolii isolated from annual and perennial species of Trifolium

Creator:: Dashti, Narjes Haje
Resource Type:: Masters Thesis
Full Text:: Perennial Species of Trifolium. Abstract approved: Redacted for Privacy Peter J. Bottomley ,/ In previous

Symbiotic and saprophytic characteristics of a soil population of Rhizobium leguminosarum bv. trifolii

Creator:: Yap, Kathryn H. M.
Abstract:: Although much has been learned about the comparative nodulating behavior of simple mixtures of rhizobial strains under non-soil situations, it is unclear how these findings relate to the factors influencing nodulation success by the complex mixtures of strains found within soil-borne rhizobial populations. Information on the structure and physiological behavior...
Resource Type:: Masters Thesis
Full Text:: Redacted for Privacy Abstract approved: Peter J. Bott6mley Although much has been learned about the

Influences of phosphate on the growth and nodulation characteristics of Rhizobium trifolii

Creator:: Leung, Kam-tin
Abstract:: Nodulation success by two indigenous Rhizobium trifolii serogroups, 6 and 36, on subterranean clover (Trifolium subterraneum L.) was affected by the addition of phosphate to Abiqua soil (Ultic Haploxeroll). To understand the impact of phosphorus nutrition on the survival and nodulation characteristics of the two serogroups, studies were carried out...
Resource Type:: Masters Thesis
Full Text:: Nodulation Characteristics of Rhizobium Trifolii Abstract approved: Redacted for privacy Pfber J. Bottomley

Characteristics of bradyrhizobium sp. recovered from Oregon soils

Creator:: Cheng, Hsin-hua
Abstract:: Although the biology of Bradyrhizobium has been studied for almost one hundred years, virtually nothing is known about the ecology and genetic variation in natural soil populations of this genus. The majority of information has been obtained from studies of one species, Bradyrhizobium japonicum, and the diversity within soil populations...
Resource Type:: Masters Thesis
Full Text:: soils. Redacted for Privacy Abstract Approved: Peter J. Bottoy Although the biology of

Growth characteristics of 2,4-dichlorophenoxyacetic acid degrading bacteria recovered from an Oregon soil

Creator:: Phillips, David C.
Resource Type:: Masters Thesis
Full Text:: approved: Peter J. Bottom ley Man-made pesticides have been used extensively in agriculture for about 50

Symbiotic characteristics of Rhizobium leguminosarum bv. trifolii recovered from nodules of field-grown Trifolium subterraneum L.

Creator:: Wanjagi, Francis Ndung'u
Abstract:: In a series of greenhouse experiments, isolates representing serotypically distinct subpopulations of Rhizobium leguminosarum bv. trifolii recovered from root nodules of field-grown subclover Trifolium subterraneum cv. "Nangeela"), were evaluated for their symbiotic effectiveness potential, their effect on regrowth potential of subclover, and for their competitive abilities to form nodules. Isolates...
Resource Type:: Masters Thesis
Full Text:: of Field-grown Trifolium subterraneum L. Abstract Approved: Redacted for Privacy Peter J

Impact of a red clover winter cover crop on carbon and nitrogen mineralization by microorganisms in soil aggregates

Creator:: Ndiaye, Aissatou
Abstract:: Although legumes have been widely studied for their nitrogen-fixing ability, it is uncertain to what extent legume cover crops achieve their nitrogen-fixing potential under the climatic conditions encountered in western Oregon. Furthermore, it is unknown what factors control the proportions of legume cover crop N that are either sequestered into...
Resource Type:: Masters Thesis
Full Text:: professor, Dr Peter J. Bottom ley, thank for his patience, his friendship, his help in the lab analysis

An epifluorescence method for assessing viability of bacteria in soil aggregates

Creator:: Shiozawa, Tracy L.
Resource Type:: Masters Thesis
Full Text:: . 81-106. In: R. W. Weaver, J. S. Angle and P. J. Bottomley (ed.), Methods of Soil Analysis. Part 2

ScholarsArchive@OSU

Community profiles of ammonia oxidizers across high-elevation forest-to-meadow transects

Episodic dynamics of microbial communities associated with the birth and death of ectomycorrhizal mats in old-growth Douglas-fir stands

Characterization of indigenous Rhizobium leguminosarum bv. trifolii isolated from annual and perennial species of Trifolium

Symbiotic and saprophytic characteristics of a soil population of Rhizobium leguminosarum bv. trifolii

Influences of phosphate on the growth and nodulation characteristics of Rhizobium trifolii

Characteristics of bradyrhizobium sp. recovered from Oregon soils

Growth characteristics of 2,4-dichlorophenoxyacetic acid degrading bacteria recovered from an Oregon soil

Symbiotic characteristics of Rhizobium leguminosarum bv. trifolii recovered from nodules of field-grown Trifolium subterraneum L.

Impact of a red clover winter cover crop on carbon and nitrogen mineralization by microorganisms in soil aggregates

An epifluorescence method for assessing viability of bacteria in soil aggregates

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