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Creator | Title | Description | Subject | Date |
501 |
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Ehleringer, James R. | Evaluación de la capacidad estacional de utilizar eventos de preciptación en tres especies de arbustos nativos de Chile con distintos sistemas radiculares | Se evaluó la capacidad estacional de utilizar un evento de precipitación en tres especies arbustivas con diferentes sistemas radiculares (dimórficos: Balbisia peduncularis, Senna cumingii; profundo: Haplopappus parvifolius) en la Quebrada El Romeral, norte-centro de Chile. El sitio posee un clima... | Fuentes de agua; Proporción de isótopos estables; Sistema radicular; Desertificación; Zonas áridas; Chile; Water sources; Stable isotopes ratio; Root system; Arid zone; Balbisia peduncularis; Senna cummingii; Haplopappus parvifolius | 2002 |
502 |
|
Sperry, John S. | Evaluation of Murray's law in Psilotum nudum (Psilotaceae), an analogue of ancestral vascular plants | Previous work has shown that the xylem of seed plants follows Murray's law when conduits do not provide structural support to the plant. Here, compliance with Murray's law was tested in the stem photosynthesizer Psilotum nudum, a seedless vascular plant. Psilotum nudum was chosen because the central... | Conduit furcation number; hydraulic architecture; Murray's law | 2005 |
503 |
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Gondolo, Paolo | Evidence for "sterile neutrino" dark matter? | I show that it may be possible to explain the present evidence for a gamma-ray emission from the galactic halo as due to halo WIMP annihilations. Not only the intensity and spatial pattern of the halo emission can be matched but also the relic density of the candidate WIMP can be in the cosmologica... | Sterile neutrino; WIMP; Weakly interacting massive particles; Annihilations; Z boson; Higgs sector | 1998 |
504 |
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Sokolsky, Pierre | Evidence for 10^18-eV neutral particles from the direction of Cygnus X-3 | Analysis of the cumulative Fly's Eye data reveals an excess of air showers from the direction of Cygnus X-3 at energies above 0.5 x 10^18 eV. No point source has previously been identified at such high energies. The probability of this excess arising as a chance clustering of isotropic cosmic rays i... | Cygnus X-3; Extensive air showers; Neutral particles | 1989-01 |
505 |
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Seger, Jon | Evidence for a cryptic species complex in the ant parasitoid Apocephalus paraponerae (Diptera: Phoridae) | Cryptic species complexes occur in many taxa, in particular in the insect order Diptera. Here we describe a possible new cryptic species complex in the family Phoridae. Three lines of evidence suggest that Apocephalus paraponerae, an ant parasitoid, is actually a complex of at least four genetically... | Host; Sequence; Populations | 2001 |
506 |
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Sokolsky, Pierre; Cassiday, George L. | Evidence for a high-energy cosmic-ray spectrum cutoff | We report a measurement of the ultrahigh-energy cosmic-ray spectrum using an atmospheric fluorescence technique for extensive-air-shower detection. The differential spectrum between 0.1 and 10 EeV (1 EeV = 10^18 eV) is well fitted by a power law with slope 2.94 ±0.02. Above 10 EeV evidence is prese... | Energy spectrum; Extensive air showers; Spectral cutoff | 1985-04 |
507 |
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Vardeny, Zeev Valentine; Raikh, Mikhail E. | Evidence for braggoriton excitations in opal photonic crystals infiltrated with highly polarizable dyes | We studied angle-dependent reflectivity spectra of opal photonic crystals infiltrated with cyanine dye aggregates, which are highly polarizable media with very large Rabi frequency. We show that, at resonance condition between the exciton-polariton of the dye aggregate and the Bragg gap, the Bragg s... | Braggoriton excitations; Opal photonic crystals; Cyanine dye aggregates; Bragg; Photonic band-gap; PBG; Polarizable dyes | 2002 |
508 |
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Kieda, David B. | Evidence for changing of cosmic ray composition between 10(17) and 10(18) eV from multicomponent measurements | The average mass composition of cosmic rays with primary energies between 1017 and 1018 eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the ... | Cosmic rays; Particle energy; Muon array | 2000 |
509 |
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Sokolsky, Pierre | Evidence for changing of cosmic ray composition between 10^17 and 10^18 eV from multicomponent measurements | The average mass composition of cosmic rays with primary energies between 1017 and 1018 eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the... | Extensive air showers; Fluorescence; Energy spectrum; Muon density; Cherenkov light | 2000-05 |
510 |
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Sokolsky, Pierre | Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies | The Utah Fly's Eye detector has revealed a change in the cosmic ray composition which is correlated with structure in the all-particle energy spectrum. The data can be fitted by a simple model of a steep power law spectrum of heavy nuclei which is overtaken at high energies by a flatter spectrum of ... | Energy spectrum; Extensive air showers | 1993-11 |
511 |
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Kieda, David B.; Gaisser, Thomas K.; Sokolsky, Pierre | Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies | The Utah Fly's Eye detector has revealed a change in the cosmic ray composition which is correlated with structure in the all-particle energy spectrum. The data can be fitted by a simple model of a steep power law spectrum of heavy nuclei which is overtaken at high energies by a flatter spectrum o... | Ultrahigh energy cosmic rays; Fly's Eye; Cosmic ray composition; Cosmic ray spectrum | 1993-11 |
512 |
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Ailion, David Charles | Evidence for elastic disorder in the elastically ordered phase of KCN | We have obtained evidence from 1 3C NMR measurements that the CN~ ion in the elastically ordered phase of KCN is misoriented slightly with respect to the orthorhombic b axis. This misorientation varies randomly over the lattice, averaging to zero on a macroscopic scale. The misorientations are mani... | Potassium cyanide; Anisotropy; Orthorhombic crystal; NMR; Nuclear magnetic resonance | 1981 |
513 |
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Carrier, David R. | Evidence for endothermic ancestors of crocodiles at the stem of archosaur evolution | Physiological, anatomical, and developmental features of the crocodilian heart support the paleontological evidence that the ancestors of living crocodilians were active and endothermic, but the lineage reverted to ectothermy when it invaded the aquatic, ambush predator niche. In endotherms, there i... | Endothermy; ectothermy; Archosaur evolution; Archosaurs; Crocodilian heart | 2004 |
514 |
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Vardeny, Zeev Valentine | Evidence for excimer photoexcitations in an ordered ?-conjugated polymer film | We report pressure-dependent transient picosecond and continuous-wave photomodulation studies of disordered and ordered films of 2-methoxy-5-(2-ethylhexyloxy) poly(para-phenylenevinylene). Photoinduced absorption (PA) bands in the disordered film exhibit very weak pressure dependence and are assign... | | 2011 |
515 |
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Williams, Clayton C. | Evidence for internal electric fields in two variant ordered GaInP obtained by scanning capacitance microscopy | Single and two variant ordered GaInP samples are studied in cross section with the scanning capacitance microscope. Our study shows significant differences in the electronic properties of single and two variant GaInP. In unintentionally doped, ordered two variant samples, both n and p-type like do... | GaInP2; Atomic ordering; Internal electric fields; Scanning capacitance microscope | 1996 |
516 |
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Miller, Joel Steven; Epstein, Arthur J. | Evidence for solitons in conducting organic charge-transfer crystals | Magnetic susceptibility of (N-methylphenazinium)x(phenazine)(1-x (tetracyanoquinodimethanide) [(NMP)x(Phen)1-x(TCNQ)] shows the formation of defect states for 0.5<x<0.54. Diffuse x-ray scattering and g-value studies indicate that these defects are solitons formed in the highly correlated quasi-one-... | TCNQ; X-ray scattering | 1982 |
517 |
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Lupton, John Mark | Evidence for temperature-independent triplet diffusion in a ladder-type conjugated polymer | We study the temperature dependence of triplet formation and decay by considering the phosphorescence dynamics in a prototypical conjugated polymer matrix. The dynamics of triplet formation as a function of temperature are unraveled by applying an electric field during optical singlet generation a... | Triplet diffusion; Triplet excitons; Ladder-type conjugated polymers; Temperature dependence | 2006-12 |
518 |
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Beckerle, Mary C. | Evidence for the selective association of a subpopulation of GPIIb-IIIa with the actin cytoskeletons of thrombin-activated platelets | Activation of blood platelets triggers a series of responses leading to the formation and retraction of blood clots. Among these responses is the establishment of integrin-mediated transmembrane connections between extracellular matrix components and the actin cytoskeleton of the platelet. | Actin; GPIIb-IIIa | 1993 |
519 |
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Williams, Clayton C. | Evidence of internal electric fields in GaInP2 by scanning capacitance and near-field scanning optical microscopy | GaInP2 is studied in cross section with the scanning capacitance and near-field scanning optical microscope. Our study shows significant differences in the electronic and optical properties between ordered single- and two-variant GaInP2. In single-variant samples, spatially uniform capacitance signa... | Atomic ordering; transmission electron diffraction; near-field scanning optical microscope | 1997 |
520 |
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Williams, Clayton C. | Evidence of internal fields in two-variant ordered GaInP2 by near-field scanning optical microscopy | GaInP2 is studied in cross section with the scanning capacitance and near-field scanning optical microscope. Our study shows significant differences in the electronic and optical properties between ordered single- and two-variant GaInP2. In single-variant samples, spatially uniform capacitance signa... | Photoluminescence; GaInP2; Microscopy; Electrical fields | 1997 |
521 |
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Vardeny, Zeev Valentine | Evolution of excitons and polarons in polythiophene from femtoseconds to milliseconds | We have studied the photoexcitation dynamics in electrochemically polymerized polythiophene thin films using transient photomodulation spectroscopy measured from 100 fs to 20 ms in the spectral range from 0.25 to 2.2 eV, and by the novel technique of absorption-detected magnetic resonance (ADMR). ... | Femtoseconds; Milliseconds; Photoexcitation dynamics | 1992-07 |
522 |
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Adler, Frederick R. | Evolution of forager responses to inducible defenses | Most theoretical and empirical investigations of inducible defenses have focused on identifying conditions that favor the evolution of inducibility by the prey species. These analyses outline the essential consequences of frequency-dependent benefits of deploying the defense, degrees of predictabili... | Predation; Cues; Phenotypes | 1999 |
523 |
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Seger, Jon | Evolution of individuality by Leo W. Buss | Metazoans seldom reproduce vegetatively; they often die of cancer; and they almost always sequester their germ lines. Plants often reproduce vegetatively, seldom die of cancer, and almost never sequester a germ line. Buss argues that these and many other patterns can all be understood in a unified w... | Cell lines; Hierarchy; Biology | 1988 |
524 |
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Potts, Wayne K. | Evolution of mating preferences and major histocompatibility complex genes | House mice prefer mates genetically dissimilar at the major histocompatibility complex (MHC). The highly polymorphic MHC genes control immunological self/nonself recognition; therefore, this mating preference may function to provide "good genes" for an individual's offspring. However, the evidence ... | Inbreeding; Parasites; Recognition | 1999 |
525 |
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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 |