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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Ecological And Agricultural Applications Of Synchrotron Ir Microscopy, Ted K. Raab, John P. Vogel
Ecological And Agricultural Applications Of Synchrotron Ir Microscopy, Ted K. Raab, John P. Vogel
Ted K. Raab
The diffraction-limited spot size of synchrotron-based IR microscopes provides cell-specific, spectrochemical imaging of cleared leaf, stem and root tissues of the model genetic organism Arabidopsis thaliana, and mutant plants created either by T-DNA insertional inactivation or chemical mutagenesis. Spectra in the wavelength region from 6 to 12 microns provide chemical and physical information on the cell wall polysaccharides of mutants lacking particular biosynthetic enzymes (‘‘Cellulose synthase-like’’ genes). In parallel experiments, synchrotron IR microscopy delineates the role of Arabidopsis cell wall enzymes as susceptibility factors to the fungus Erysiphe cichoracearum, a causative agent of powdery mildew disease. Three genes, pmr4, pmr5, …
Karst Of Western Cuba: Observations, Geomorphology, And Diagenesis, Larry D. Seale, Limaris R. Soto, Lee J. Florea, Beth Fratesi
Karst Of Western Cuba: Observations, Geomorphology, And Diagenesis, Larry D. Seale, Limaris R. Soto, Lee J. Florea, Beth Fratesi
Lee J Florea, PhD, P.G.
In Cuba, we observed many karst features in a variety of hydrogeologic settings. These hy-drogeologic settings occur in close proximity only because of the complex tectonic history of the is-land. We observed caves within rocks ranging from Pleistocene to Jurassic, and representing a range of diagenetic ages from eogenetic to teloge-netic. Our observations are from the western one-third of the island of Cuba; however, we believe they are representative of hydrogeologic settings found throughout the island.
1d Energy Transport In A Strongly Scattering Laboratory Model, Kasper Van Wijk, Matt M. Haney, John A. Scales
1d Energy Transport In A Strongly Scattering Laboratory Model, Kasper Van Wijk, Matt M. Haney, John A. Scales
Matthew M. Haney
Radiative transfer (RT) theory is often invoked to describe energy propagation in strongly scattering media. Fitting RT to measured wave field intensities is rather different at late times, when the transport is diffusive, than at intermediate times (around one extinction mean free time), when ballistic and diffusive behavior coexist. While there are many examples of late-time RT fits, we describe ultrasonic multiple scattering measurements with RT over the entire range of times—from ballistic to diffusive. In addition to allowing us to retrieve the scattering and absorption mean free paths independently, our results also support theoretical predictions in 1D that suggest …
Determining The Cooling History Of In Situ Lower Oceanic Crust—Atlantis Bank, Sw Indian Ridge, Barbara John, D Foster, J Murphy, M Cheadle, A Baines, C Fanning, P Copeland
Determining The Cooling History Of In Situ Lower Oceanic Crust—Atlantis Bank, Sw Indian Ridge, Barbara John, D Foster, J Murphy, M Cheadle, A Baines, C Fanning, P Copeland
Barbara John
No abstract provided.
Light & Dark: The Hidden Wonders Of Buck Creek, Lee J. Florea
Light & Dark: The Hidden Wonders Of Buck Creek, Lee J. Florea
Lee J Florea, PhD, P.G.
As early morning mists rise from the banks of its supple waters, beams of light penetrate the Buck Creek valley illuminating its beauty. While light illuminates most of the land, there are secret places, nestled within the forest where darkness reigns supreme. Places beyond the touch of the sun, beyond the influence of seasons. Here time is measured not in cycles of light but by the flow of water and fall of rock. These are the caves, conduits for water past and present. Nestled in the hills of south-central Kentucky the caves along Buck Creek provide the lifeblood for a …
Sedimentation And Porosity Enhancement In A Breached Flank Margin Cave, Lee J. Florea, John Mylroie, Adam Price
Sedimentation And Porosity Enhancement In A Breached Flank Margin Cave, Lee J. Florea, John Mylroie, Adam Price
Lee J Florea, PhD, P.G.
No abstract provided.
“Strong Feedbacks Between Hydrology And Sliding Of A Small Alpine Glacier.”, Kelly R. Macgregor, R.S. Anderson, S.P. Anderson, E.D. Waddington, S. O’Neel, C.A. Riihimaki, M.G. Loso
“Strong Feedbacks Between Hydrology And Sliding Of A Small Alpine Glacier.”, Kelly R. Macgregor, R.S. Anderson, S.P. Anderson, E.D. Waddington, S. O’Neel, C.A. Riihimaki, M.G. Loso
Kelly R. MacGregor
No abstract provided.