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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 191 for “"poplar"”.
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Transgenic manipulation of polyamine metabolism in poplar
… polyamine and related pathways in transformed poplar cells overexpressing a mouse odc cDNA under the control of 2X 35S CaMV promoter. The transgenic cells (line 2E) showed elevated levels of mouse ornithine decarboxylase enzyme activity, several fold higher amounts of putrescine, a small …
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Evolutionary Genomics of Populus trichocarpa (Western Poplar)
Forest trees are an important pool of biodiversity at the gene, individual and an ecosystem level. This variation is a result of complex environmental interactions, as well as neutral and selective forces acting on populations. Patterns of standing genetic variation are the result of adaption to …
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Peroxyalkanoic cellulose purification of steam exploded yellow poplar
Water and alkali extracted steam exploded yellow poplar fiber (log R₀ 4.25) was purified through a multi-stage process. The initial stage consisted of peralkanoic acid treatment, either formic or acetic acid, at atmospheric pressure. Subsequent bleaching was achieved through treatment with alkaline …
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Flowering Gene Homologs Regulate Seasonal Growth Changes in Poplar
… winter and maximize growth. The genus Populus (poplars) is a model system for identifying the genes and molecular mechanisms that regulate growth and dormancy transitions. Photoperiod and temperature regulate both vegetative and floral phenology. FLOWERING LOCUS T (FT) and FLOWERING LOCUS D (FD) …
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Geology of the Poplar Hill area Giles County, Virginia
The Poplar Hill area lies in the southwest corner of Giles County, Virginia and contains marine sedimentary rocks that range in age from Middle Cambrian to Middle Bilurian. The formations trend northeast in narrow outcrop belts. The summit of Walker Mountain is the southeastern boundary of the area …
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Understanding polyamine metabolism through transgenic manipulation in poplar suspension cultures
… spermidine, and spermine. Suspension cultures of poplar (Populus nigra x maximowiczii), transformed with a mouse ornithine decarboxylase gene (under the control of a 2X 35S CaMV promoter) were used to study the impact of up-regulation of putrescine biosynthesis (and consequent enhanced catabolism) …
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The Missoula Poplar Project: Utilizing Poplars to Enhance Wastewater Treatment
… dormant, unrooted stem cuttings of two hybrid poplar species, Populus deltoides X Populus trichocarpa and Populus deltoides X Populus nigra, and the native Black Cottonwood, Populus balsamifera ssp. trichocarpa. The effects of effluent fertilization on poplar growth, soil and ground water …
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The Missoula Poplar Project: Utilizing Poplars to Enhance Wastewater Treatment
… dormant, unrooted stem cuttings of two hybrid poplar species, Populus deltoides X Populus trichocarpa and Populus deltoides X Populus nigra, and the native Black Cottonwood, Populus balsamifera ssp. trichocarpa. The effects of effluent fertilization on poplar growth, soil and ground water …
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Life cycle analysis of hybrid poplar trees for cellulosic ethanol
… and environmental benefits of cultivating hybrid poplars as a biomass crop for cellulosic ethanol. A "Life Cycle Assessment" (LCA) methodology is used to systematically evaluate the hybrid poplar's energy input and output as well as greenhouse gas (GHG) emissions. The system boundary is divided …
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Practical drying techniques for yellow-poplar S-D-R flitches
The S-D-R (Saw-Dry-Rip) process is a proven method of reducing warp in manufacturing hardwood studs. It has been assumed that its success is partially due to the stress relaxation caused by high-temperature drying. Implementation of this S-D-R process in the Appalachian region has been limited as …
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Functional analysis of Poplar genes regulating flowering and vegetative growth
Poplar (Populus spp. and hybrids) are used for pulp, paper and solid wood products. Furthermore, poplar is being developed as a dedicated biomass crop for biofuels and biomaterials. Thus, methods to accelerate genetic improvement to improve woody biomass yield, quality and optimal growth on …
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Compatible taper and volume equations for yellow-poplar in West Virginia
Yellow-poplar (Liriodendron tulipifera L.) is an important source of raw material for the forest products industry in West Virginia. Accurate taper and volume functions are an important component of most inventory systems for use in estimating upper stem diameter, form, and tree volume. Compatible …
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Experimental investigation of dark fermentation of poplar leaves for biohydrogen production
… of H2 hydrogen production potential of poplar leaves as a substrate for biohydrogen production via dark fermentation, an underexplored area. Through a series of 58 experimental trials, insightful findings were obtained about the hydrogen production process. The Gompertz function is used …
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Economic analysis of thinning alternatives in natural stands of yellow-poplar
… to evaluate thinning alternatives in yellow-poplar stands. The program is written Applesoft BASIC for the APPLE II+ microcomputer with a design which emphasizes flexibility and ease of use. The program consists of two primary segments: growth and yield, and economic evaluation. The growth and …
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Evapotranspiration Measurement and Simulation due to Poplar Trees at a Phytoremediation Site
… was chosen as the remediation strategy. Hybrid poplar trees (1,036) were planted in 1997 within 0.7 acres. The goals of the phytoremediation system are to prevent migration of the contaminant off the site and clean up the contaminant in-situ. This study is focused on quantifying the rate of …
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Cross-Laminated Timber made of Unmodified and Thermally Modified Yellow-Poplar Lumber
… and reduce moisture-related issues. Yellow-poplar (YP), abundant in the Appalachian region, is a promising raw material due to its availability and favorable mechanical properties and incorporating its TMW into CLT outer layers offers a sustainable strategy to improve moisture resistance, …
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A growth and yield prediction model for thinned stands of yellow- poplar
… and cubic-foot volume growth and yield in yellow-poplar stands after a single thinning indicated that a separate set of coefficients was required for stands thinned twice. A joint loss function involving both volume and basal area was used to estimate the coefficients in the system of equations. …
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