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Creator | Title | Description | Subject | Date |
| 1 |
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Miller, Joel Steven; Epstein, Arthur J. | Anomalous magnetoresistance in high-temperature organic-based magnetic seminconducting V(TCNE)x films | Anomalous positive magnetoresistance (MR) in high temperature organic-based magnet V(TCNE)x (TCNE=tetracynoethylene) thin films is reported. MR increases linearly with applied magnetic field and shows a maximum at the ferrimagnetic ordering temperature. The suggested roles of oppositely spin pola... | Spin; Ferrimagnetic; Resistance | 2003 |
| 2 |
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Kieda, David B. | Antarctic impulsive transient antenna (ANITA) instrumentation | We will report on the details of the ANITA instrument. This instrument is fundamentally a broadband antenna, which is arrayed and constructed in such a way as to be optimized for the detection and characterization of high-energy neutrino cascades [1]. The requirement to maximize the detector view of... | ANITA; Antarctic Impulsive Transient Antenna; Neutrino; Balloon; Antarctica | 2003 |
| 3 |
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Clayton, Dale H. | Biology, ecology, and evolution of chewing lice | Chewing lice are small, dorsoventrally compressed insects and are parasites of virtually all birds (Fig. 1) and some mammals (Fig. 2). Many chewing lice are host specific, being found on only a single species of host. All chewing lice are permanent ectoparasites and complete their entire life c... | Chewing lice | 2003 |
| 4 |
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Sperry, John S. | Cavitation fatigue - the weakening of cavitation resistance of xylem and its reversibility | Xylem function is essential for the growth and survival of higher land plants. Xylem must not only be efficient under favorable conditions to facilitate high rates of stomatal conductance and carbon uptake, but it should also remain functional under drought conditions, when water potential (Ψ) dro... | Cavitation fatigue; Drought; Pit membrane | 2003 |
| 5 |
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Clayton, Dale H. | Coevolutionary history of ecological replicates: comparing phylogenies of wing and body lice to Columbiform hosts | Phylogenies depict the history of speciation for groups of organisms. Comparing the phylogenies of interacting groups can reveal instances of tandem speciation, or "cospeciation" (Brooks and McLennan, 1991; Hoberg et al., 1997; Paterson and Gray, 1997). Understanding the conditions under which cosp... | Feather lice; Wing lice; Body lice; Cospeciation | 2003 |
| 6 |
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Goller, Franz | Coordination and synergism between visual and vocal display in the brown-headed cowbirds | Sexually selected acoustic signaling is accompanied by visual displays in many birds. The motor integration of visual and vocal displays has not been extensively studied. Brown-headed cowbirds (Molothrus ater) "puff up" prior to song, move their wings during the song and conclude with a bow. The ... | Acoustic signaling; Wing display; Synergistic interaction | 2003 |
| 7 |
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Morse, Michael David | Dispersed fluorsecence spectroscopy of AINi, NiAu, and PtCu | Dispersed fluorescence studies of AlNi, NiAu, and PtCu have been performed, providing spectroscopic information about the ground and low-lying excited electronic states. Vibrational frequencies are reported for the ground X 2?5/2 state of all three molecules. In the case of AlNi, fluorescence to all... | | 2003 |
| 8 |
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Clayton, Dale H. | Ecological basis of coevolutionary history | Macroevolutionary patterns are difficult to interpret because they are the product of a time scale so vast that deterministic and chance events are hard to distinguish. Although the macroevolutionary history of a group can be reconstructed from extant species, determining the ecological context in ... | | 2003 |
| 9 |
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Sperry, John S. | Evolution of water transport and xylem structure | Land plants need water to replace the evaporation that occurs while atmospheric CO2 is diffusing into photosynthetic tissue. The water-for-carbon exchange rate is poor, and evolutionary history indicates a progression of innovations for cheap water transport--beginning in order with capillary sucti... | Cavitation; Vessels; Plants | 2003 |
| 10 |
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Vardeny, Zeev Valentine | Excitons, polarons, and laser action in poly(p-phenylene vinylene) films | We have used a multitude of linear and nonlinear cw optical spectroscopies to study the optical properties of water precursor poly(p-phenylene vinylene) (PPV) thin films. These spectroscopies include absorption, photoluminescence, photoinduced absorption and their respective optically detected magne... | PPV films; Excitons; Laser action; Poly(p-phenylene vinylene) | 2003 |
| 11 |
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Ehleringer, James R.; Cerling, Thure E.; Dearing, Maria-Denise | Experimental study of carbon-isotope fractionation between diet, hair, and feces of mammalian herbivores | The carbon-isotope composition of hair and feces offers a glimpse into the diets of mammalian herbivores. It is particularly useful for determining the relative consumption of browse and graze in tropical environments, as these foods have strongly divergent carbon-isotope compositions. Fecal ?13C v... | Fractionation; Mammalian herbivores; Medicago sativa; Cynodon dactylon | 2003 |
| 12 |
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Goller, Franz | Experimental support for a model of birdsong production | In this work we present an experimental validation of a recently proposed model for the production of birdsongs. We have previously observed that driving the model with simple functions of time, which represent tensions in vocal muscles, produces a wide variety of sounds resembling birdsongs. In th... | Vocal; Muscles; Syrinx | 2003 |
| 13 |
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Clayton, Dale H. | Experimental test of the importance of preen oil in Rock Doves (Columba livia) | Most species of birds have a uropygial gland, also known as a preen gland, which produces oil that birds spread through their plumage when preening. The plumage of waterfowl deprived of uropygial oil becomes brittle and is subject to breakage. | Columba livia; Columbiformes; Preen oil; Ectoparasites; Columbicola columbae; Campanulotes compare; Plumage | 2003 |
| 14 |
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Armentrout, Peter B. | Guided ion beam studies of the reactions of Nin+ (n=2-18) with O2: nickel cluster oxide and dioxide bond energies | The kinetic energy dependences of the reactions of Nin + (n=2 - 18) with O2 are studied in a guided ion beam tandem mass spectrometer. A variety of NimO2+, NimO+, and Nim+ product ions, where m<n, are observed, with the dioxide cluster ions dominating the products for all larger reactant cluster io... | Metal clusters; Nickel oxide; Nickel dioxide; Bond energies; Collision-induced dissociation; Exothermic reactions | 2003 |
| 15 |
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Kieda, David B. | High resolution charge measurements of UH cosmic ray nuclei using a direct imaging Cherenkov ground-based observatory | The accurate determination of the elemental composition of cosmic rays at high energies is expected to provide crucial clues on the origin of these particles. Here we discuss a technique that has become possible through the use of modern ground-based Cherenkov imaging detectors. We combine a measure... | Cherenkov light; Quark star; UH nuclei; Magnetic monopole | 2003 |
| 16 |
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Adler, Frederick R. | How virulent should a parasite be to its vector? | Vector-borne parasites are commonly predicted to be less virulent to the vector than to the definitive host as the parasite gains little by harming its main route of transmission. Here we assess the empirical evidence from systems in which insects are vectors for vertebrate, plant, and invertebrate ... | Parasite virulence; Hosts; Vector-borne parasite | 2003 |
| 17 |
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Bohs, Lynn A. | ITS phylogeny of Balsamorhiza and Wyethia (Asteraceae: Heliantheae) | The relationships among the species of Balsamorhiza and Wyethia (Asteraceae: Heliantheae) were examined using data from the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA. The ITS sequences were obtained from nine species of Balsamorhiza and 14 species of Wyethia as well as se... | Asteraceae; Balsamorhiza; Heliantheae; Internal transcribed spacer; ITS; Molecular phylogeny; Wvethi | 2003 |
| 18 |
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Armentrout, Peter B. | Kinetic energy dependence of association reactions. A new thermokinetic method for large systems | The reactions of bare alkali metal ions (M+5Li+, Na+, or K+) with dimethoxyethane (CH3OCH2CH2OCH3 , (DXE) are studied using guided ion beam tandem mass spectrometry. The bimolecular reaction forms an associative M1(DXE) complex that is long-lived and dissociates back to the reactants. The kinetic en... | Collision-induced dissociation; Association reactions; Bond energies; Dimethoxyethane; Alkali metal ions | 2003 |
| 19 |
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Linton, Matthew J. | Magnitude and mechanisms of disequilibrium between predawn plant and soil water potentials | Predawn plant water potential (Uw, measured with leaf psychrometers) and surrogate measurements made with the pressure chamber (termed Upc here) are used to infer comparative ecological performance, based on the expectation that these plant potentials reflect the wettest soil Uw accessed by roots. T... | Roots; Transpiration; Solutes | 2003 |
| 20 |
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Potts, Wayne K. | Major histocompatibility complex heterozygote superiority during coinfection | Genes of the major histocompatibility complex (MHC) play a critical role in immune recognition, and many alleles confer susceptibility to infectious and autoimmune diseases. How these deleterious alleles persist in populations is controversial. | Pathogen; MHC; Homozygotes | 2003 |
| 21 |
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Potts, Wayne K.; Granger, Donald Lee | Major histocompatibility complex-dependent susceptibility to Cryptococcus neoformans in mice | To evaluate the role of major histocompatibility complex (MHC) genes in the resistance to Cryptococcus neoformans, we conducted infection experiments in MHC-congenic strains of mice. Significant MHC-dependent susceptibility differences were found among homozygotes and heterozygotes. This study is th... | MHC-congenic; Host resistance; Infection | 2003 |
| 22 |
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Capecchi, Mario R. | Mice lacking endothelial ACE: normal blood pressure with elevated angiotensin II | Recently, the concept of local renin-angiotensin systems (RAS) capable of generating angiotensin II apart from the circulation has received considerable attention. To investigate this, we generated ACE 1/3 mice in which one allele of ACE is null and the second allele was engineered to express ACE o... | | 2003 |
| 23 |
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Olivera, Baldomero M. | Novel Conus peptide ligand for K+ channels | Voltage-gated ion channels determine the membrane excitability of cells. Although many Conus peptides that interact with voltage-gated Na+ and Ca2+ channels have been characterized, relatively few have been identified that interact with K+ channels. We describe a novel Conus peptide that intera... | Conus peptides; Conotoxins | 2003 |
| 24 |
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Lupton, John Mark | One and two-photon photocurrents from tunable organic microcavity photodiodes | We have constructed multilayer thin-film organic microcavity photodiodes with the photoactive layer comprised of a spin-coated conjugated polymer and an evaporated C60 layer. The electrodes are designed as semitransparent mirrors which form a resonant cavity structure. The photocurrent spectra show ... | Photocurrents; Microcavity photodiodes; Tunable photodiodes | 2003 |
| 25 |
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Morse, Michael David | Optical spectroscopy of jet-cooled NiSi | The electronic states of gaseous diatomic NiSi have been investigated using the combined techniques of resonant two-photon ionization spectroscopy, dispersed fluorescence spectroscopy, and density functional computations. A single electronic band system, designated as the [8.0]1?X 1?+ system, has be... | | 2003 |
