Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 291 for “"Biology, Botany"”.
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Structure and biological activity of isolates from Anogeissus acuminata.
Structure and biological activity of isolates from Anogeissus acuminata.
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Systematic implications of isozyme number variation in Tribe Brassiceae (Brassicaceae).
Tribe Brassiceae (haploid chromosome number, n=6$-$75) is generally recognized as one of the few natural (monophyletic) groups in the Brassicaceae. Recent molecular analyses, however, have questioned the validity of this subtribal classification and have proposed new generic and subtribal …
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Molecular Genetics on the Genus Glycine: I. Phylogenetic Study of the Subtribe Glycininae. II. Development of a Universal Soybean Genetic Map
During the last decade various soybean genetic linkage maps have been developed based not only on morphological and biochemical traits but also on molecular traits such as RFLP, RAPD, AFLP, and SSR data. None of these, however, has been associated with specific chromosomes of soybean. Therefore, …
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Genomic Organization of Fatty Acid Desaturase-2 (Fad2 ) and Fatty Acid Desaturase-6 (Fad6) ESTs in Maize
Corn oil is primarily composed of palmitic, stearic, oleic, linoleic and linolenic fatty acids. Increased levels of oleic acid may enhance the nutritional and functional value of corn oil. The biochemical pathway for fatty acid biosynthesis indicates that a single enzyme, the delta12 desaturase, …
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An Experimental Assessment of Soil-Based Habitat Partitioning in Understory Palms
Soil nutrient and water availability can shape plant communities by influencing species composition and the functional traits that allow species to regenerate, grow and reproduce. My dissertation research established patterns of understory palm community assembly and functional traits in relation …
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Island Biogeography and Restoration: The Role of Living Fence Islands as Regeneration Foci in the Rehabilitation of Degraded Lands in Honduras
A total of 543 seedlings of 41 species established in islands. Seedling number did not differ among island types, although a trend toward greater density was apparent in artificial islands. Species richness was greater in Gliricidia islands than in Bursera or open pasture islands. Seedlings were …
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Molecular and Physiological Analysis of Putative Amino Acid Transporters in Arabidopsis Thaliana
Amino acids are the currency of nitrogen exchange in plants and their physiological and molecular analysis is essential. The objective of this thesis was to identify and analyze plant amino acid transporters using the model plant Arabidopsis thaliana. A valine resistant T-DNA insertion mutant was …
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Molecular Phylogenetic and Biogeographic Study of the Genus Artemisia (Asteraceae), With an Emphasis on Section Absinthium
Artemisia is the largest genus in the tribe Anthemideae and is composed of ecologically, morphologically, and chemically diverse species found primarily throughout the Northern Hemisphere. Delimitation within Artemisia and among allied genera in subtribe Artemisiinae has been difficult, but …
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Linking Spatial Patterns of Seed Dispersal and Plant Recruitment in a Neotropical Tree, Virola Calophylla (Myristicaceae)
Seed dispersal establishes the initial spatial template upon which demographic processes are played out to produce spatial structure in plant populations. The objective of this investigation was to develop a thorough understanding of the spatial pattern of seed dispersal, the factors affecting it, …
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Evaluation of Diversity in Glycine Soja and Genetic Relationships Within the Subgenus Soja
We conducted research on evaluating and classifying the variation of the leaflet shape and size in the USDA Soybean Germplasm Collection and determining the genetic control of leaflet shape in G. soja. The F 2 progenies of eight G. max x G. soja and G. soja x G. soja crosses indicate at least two …
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Spring Phenology and Trophic Ecology of Trees, Caterpillars, and Migrating Neotropical -Nearctic Songbirds
I investigated the trophic ecology of forest trees, caterpillars, and wood warblers (Parulidae) and vireos (Vireonidae) during spring migration in 2001--2003 at Trelease Woods, a deciduous forest fragment near Urbana, Illinois, USA (40°09'N, 88°10'W). I hypothesized that (1) the …
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Canada Thistle Management Systems for Sustainable and Organic Farms
Additionally, field studies were conducted on populations of USDA landrace and commercial sorghum accessions to evaluate morphological traits, regrowth potential, and suitability for cover cropping and biofuel applications. Canonical variates in Canonical Discriminant Analysis (CDA) indicated that …
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Vegetation Ecology and Fire Effects on Community Structure, Composition, and Diversity in a Barrens Remnant and a Flatwoods in Southern Illinois
Fire effects on composition and diversity at both sites were greatest in the ground-layer vegetation as there were significant increases in species diversity and cover and dramatic changes among dominant species. Most increase in species diversity appears to be from soil seed banks. At GCB the …
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Induction of Increased Ion Absorption in Corn Root Tissue
Made available in DSpace on 2015-05-14T14:57:39Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7121167.PDF: 4772570 bytes, checksum: bc9a007c3e7e212e99c9e1c7465e41e0 (MD5) Previous issue date: 1971
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Effects of Cations and Growth Regulators on Cell Wall Proteins and Polysaccharides of Pea Epicotyls in Relation to Cell Enlargement
Made available in DSpace on 2015-05-14T14:57:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7317271.PDF: 9385978 bytes, checksum: 42d481ca59749d3d579de69a06f8626c (MD5) Previous issue date: 1972
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The Bicarbonate Ion and Photosynthetic Oxygen Evolution
Made available in DSpace on 2015-05-14T14:57:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7511547.PDF: 2794550 bytes, checksum: f66cdd863e1bc04a3001e322e1931def (MD5) Previous issue date: 1974
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Part I. Acetylene Reduction (Nitrogen Fixation) and Metabolic Activities of Soybean Having Various Leaf and Nodule Water Potentials. Part Ii. Limitation of Acetylene Reduction (Nitrogen Fixation) by Photosynthesis in Soybean Having Low Water Potentials
Made available in DSpace on 2015-05-14T14:57:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7514123.PDF: 2516307 bytes, checksum: 43d40b90ff2b137dd124be55c0198660 (MD5) Previous issue date: 1975
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Photosystem Ii Reactions in Thylakoid Membranes
Made available in DSpace on 2015-05-14T14:57:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7514197.PDF: 5579041 bytes, checksum: 153945dd69eae589d5a9fcc6dcac3150 (MD5) Previous issue date: 1975
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Ion Transport and Cell Potentials in Corn Root Tissue
Made available in DSpace on 2015-05-14T15:09:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7616157.PDF: 6478403 bytes, checksum: f42e4c21514669393e00c1a78480f3dc (MD5) Previous issue date: 1976
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