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  • Thesis

  • Authors: Fu, Zhe (2006)

  • The code reuse problem is a common software engineering problem in scientific computing. As a prevailing programming language in many scientific fields, Fortran does not provide support to address this problem. One particular reason is that Fortran lacks the support for generic programming. By applying programgeneration techniques, we developed two approaches to address the code reuse problem. The first approach is to design a program generator for the equation-based specification of subroutines that can be generic in the dimensions of arrays, parameter lists, and called subroutines. We apply that approach to a real-world problem in scientific cpmputing, which requires the generic des...

  • 3190911.PDF.jpg
  • Thesis

  • Authors: Park, Eung-Jun (2006)

  • Chilling and freezing temperatures often adversely affect the productivity and quality of horticultural plants. Attempts to enhance cold tolerance through traditional breeding have achieved limited success, mainly due to the complexity of the genetics associated with a plant's response to low temperatures. Recently, the improvement of cold tolerance by genetic engineering has been achieved in many species. Nevertheless, transgenic plants with greater tolerance have been reported in only a few horticultural examples. Their production has led to a new era in improving performance. In this review, we first present recent advances in understanding cold acclimation. We then describe a few...

  • 3190909.PDF.jpg
  • Thesis

  • Authors: Martin, Erin P. (2006)

  • We sought major gradients in epiphytic macrolichen community composition at a landscape scale in the western Oregon Cascades. These gradients form a context for understanding likely effects of forest management, air pollution, and climate change on an important part of the biota. We also compared lichen community composition in different forest age classes to describe lichen colonization, succession, and the association of species with stands of different ages. Variation in lichen community composition was well described by nonmetric multidimensional scaling (NMS) with 83.4% of the variation accounted for. The strongest gradient (rotated to axis 1; r2 = 0.46) was related to climate as...

  • 3190900.PDF.jpg
  • Thesis

  • Authors: Han, Bingnan (2006)

  • CHAPTER TWO Semiplenamides A (1) to G (7), a series of new anandamide-like fatty acid amides, were isolated from a 1999 Papua New Guinea collection of the marine cyanobacterium Lyngbya semiplena. The planar structures of these lipids were determined using standard ID and 2D NMR methods. The relative stereochemistry of the aliphatic portion of the new metabolites was deduced from 1 D NOE data and'H-decoupling experiments, while the absolute stereochemistry of the amino alcohol moieties was assigned by chemical derivatization and chiral GC-MS methods. All of these new metabolites displayed toxicity in the brine shrimp model system, three showed modest potency in displacing radiolabel...

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  • Thesis

  • Authors: Zhang, Wei (2006)

  • As one of the most potent cytotoxic compounds of amphidinolide family, amphidinolide B1 was isolated from a culture of amphidinium genus free-swimming dinoflagellate.l In addition to its intriguing bioactivity, amphidinolide B1 has some attractive structural features including a C13-C15 highly substituted diene, an unusual allyl epoxide moiety, nine stereocenters and 26-membered macrolactone skeleton. Although numerous synthetic efforts toward the total synthesis of amphidinolide B1 have been published, it remains an unconquered target. In our synthetic study, many useful protocols have been developed. To establish the C13-C15 diene, we applied a novel Fleming-type coupling and subse...

  • 3207147.PDF.jpg
  • Thesis

  • Authors: Ding, Pinghai (2006)

  • CHAPTER 3: The accuracy of nondestructive optical methods for chlorophyll (Chl) assessment based on leaf spectral characteristics depends on the wavelengths used for Chl assessment. To determine the optimum wavelengths for Chl assessment (OWchl) using reflectance spectroscopy, almond (Prunus dulcis (Mill.) D.A. Webb `Nonpareil'), poplar (UCC-1, a hybrid of Populus trichocarpa x P. deltoides, Union Camp, Princeton, NJ) and apple (Malus domestica Borkh `Fuji') trees were grown at different rates of nitrogen (N) fertilization to produce leaves with different Chl concentrations. Spectral reflectance of leaf discs was measured using a spectroradiometer (300 nm to 1100 nm at 1 nm intervals)...