|
|
Creator | Title | Description | Subject | Date |
| 251 |
 |
Potts, Wayne K. | Fall migration of Golden Eagles in the Wellsville Mountains, Northern Utah, 1976-1979 | Migratory movements of Golden Eagles were investigated in detail as part of a 4-year autumn raptor migration study atop an 8,600-foot ridge in the Wellsville Mountains. In 856 observation hours (161 days) between 6 August and 28 November, 898 Golden Eagles (10% of the oral raptor flight) were counte... | Wellsville Mountains; Golden eagles; Fall migration | 1984 |
| 252 |
 |
Ehleringer, James R. | Orientation and slope preference in barrel cactus (Ferocactus acanthodes) at its northern distribution limit | Microsite distribution and diurnal tissue temperature fluctuations were measured in Ferocactus acanthodes (barrel cactus) at its northern distribution limit in the Beaver Dam Mountains of southwestern Utah. At this location, barrel cacti were limited to south-facing slopes. Orientation (azimuth an... | Ferocactus acanthodes; Barrel cactus; Slope preference | 1984 |
| 253 |
 |
Olivera, Baldomero M.; McIntosh, J. Michael; Gray, William Robert | γ-Carboxyglutamate in a neuroactive toxin | The venom of a fish-hunting cone snail (Conus geographus) contains a novel toxin, the "sleeper" peptide, which induces a sleep-like state in mice when injected intracerebrally. We demonstrate that this peptide contains 5 mol of γ-carboxyglutamate (Gla) in 17 amino acids. The amino acid sequence o... | Conus geographus; Venom; Conotoxins; gamma-Carboxyglutamate; Neurotoxins | 1984 |
| 254 |
 |
Davidson, Diane W. | Dispersal adaptations of some acacia species in the Australian arid zone | Most Australian representatives of the genus Acacia have diaspores with arillate appendages indicative of adaptation for active dispersal by animals. Based on physical and chemical characteristics of these arils and mechanisms of diaspore presentation, a number of arid zone acacias can be distingu... | Acacia; Australian arid zone; Dispersal ecology; Fruit quality; Myrmecochory; Ornithochory; Seed parasitoids; Soil nutrients | 1984 |
| 255 |
 |
Olson, Randall J.; Coldwell, Karin D.; Compton, Bruce J.; Giddings, John C. | Sedimentation field-flow fractionation: a method for studying particulates in cataractous lens | It is shown that the technique of sedimentation field-flow fractionation (sedimentation [sed] FFF) can be used to determine the particle content and particle size distribution of normal and cataractous lenses. A 31-year-old normal human lens, for example, showed a particle content of 1.5% by weight ... | Fractionation; Cataractous Lens; Particulates | 1984 |
| 256 |
 |
Blair, David F. | Electron spin relaxation of CuA and cytochrome a in cytochrome c oxidase: comparison to heme, copper, and sulfur radical complexes | The method of continuous saturation has been used to measure the electron spin relaxation parameter T1T2 at temperatures between 10 and 50 K for a variety of S = % species including: CuA and cytochrome a of cytochrome c oxidase, the type1 copper in several blue copper proteins, the type 2 coppe... | Electron spin relaxation; EPR signals; Sulfur radical complexes | 1984 |
| 257 |
 |
Mattis, Daniel C. | Phonon model of vacancy-interstitial pair formation in solids | Bonds between neighboring atoms in a solid are imperfect harmonic oscillators. Through consideration of the nonlinearities, it is shown that vacancy-interstitial defect pairs can be described in terms of phonon dynamical variables. The effective spring constants are determined by self-consistency... | Harmonic; Potential; Homogeneous | 1984 |
| 258 |
 |
Vardeny, Zeev Valentine | Optical bias control of dispersive relaxations in α-Si:H | Relaxation of the photoinduced ir absorption band in α-Si:H was studied in the microsecond time domain as a function of cw bias illumination. The decays follow a power law t-α where the dispersion parameter a increases with bias illumination. At low temperatures, a increases linearly with the st... | Optical bias control; Dispersive relaxations; a-Si:H; Amorphous silicon | 1984-01 |
| 259 |
|
Vardeny, Zeev Valentine | Optical bias control of dispersive relaxations in α-SI:H | Relaxation of the photoinduced ir absorption band in a-Si:H was studied in the microsecond time domain as a function of cw bias illumination. The decays follow a power law t-a where the dispersion parameter a increases with bias illumination. At low temperatures, a increases linearly with the stead... | Optical bias; Dispersive relaxations; Amorphous silicon; a-Si:H; Photoinduced absorption; Bias-controlled tunneling; Multiple trapping | 1984-01 |
| 260 |
 |
Rogers, Alan R. | Sociobiology of sex and sexes (comment) | A comment on "Sociobiology of sex and sexes" by Marion Blute. | Sociobiology; Sex and sexes | 1984-04 |
| 261 |
 |
Sokolsky, Pierre | Total proton-proton cross section at s1/2=30 TeV | We have measured the proton-air inelastic cross section at s 1/2 = 30 TeV by observing the distribution of extensive-air-shower maxima as a function of atmospheric depth. This distribution has an exponential tail whose slope is λ = 72 ±9 g c m - 2 which implies that σ inel p-air = 530 ± 66 mb. U... | | 1984-04 |
| 262 |
 |
Wu, Yong-Shi | General theory for quantum statistics in two dimensions | Because of complicated topology of the configuration space for indistinguishable particles in two dimensions, Feynman's path-integral formulation allows exotic statistics. All possible quantum statistics in two-space are characterized by an angle parameter 9 which interpolates between bosons and fe... | Homotopy classes | 1984-06 |
| 263 |
 |
Mattis, Daniel C. | Application of tridiagonalization to the many-body problem. II. Finite T | In a previous paper of the same title, we obtained the ground-state energy of a magnetic (Wolff-model) impurity in a nonmagnetic metal. In the present Brief Report, we calculate the impurity's contribution to the density of states and heat capacity of the metal at low temperatures. Here, the Lancz... | Ground-state energy; Tridiagonalization; Magnetic impurity; Nonmagnetic metals; Heat capacity | 1984-06 |
| 264 |
 |
Wu, Yong-Shi | Multiparticle quantum mechanics obeying fractional statistics | We obtain the rule governing many-body wave functions for particles obeying fractional statistics in two (space) dimensions. It generalizes and continuously interpolates the usual symmetrization and antisymmetrization. Quantum mechanics of more than two particles is discussed and some new features a... | Multiparticle quantum mechanics; Fractional statistics | 1984-07 |
| 265 |
 |
Vardeny, Zeev Valentine | Photoinduced absorption spectra in α-GeH and α-Si:H | Measurements of steady-state photoinduced absorption in α-Ge:H and α-Si:H were extended to cover the energy range from 0.25 to 1.9 eV. The subgap photoinduced-absorption bands in both materials are interpreted in terms of four kinds of optical transitions of photogenerated carriers from traps in ... | Photoinduced absorption; in a-GeH; a-Si:H; Amorphous germanium; Amorphous silicon | 1984-07 |
| 266 |
 |
Vardeny, Zeev Valentine | Mechanism for photogeneration of charge carriers in polyacetylene | In light of new experimental observations, a mechanism for the photogeneration of charge carriers in trans-polyacetylene is presented. By way of introduction, we discuss the qualitative changes in the picture of charged-soliton photogeneration that are expected due to the inclusion of electron corre... | Photogeneration; Charge carriers; Photocarriers | 1984-07 |
| 267 |
 |
Vardeny, Zeev Valentine | Coherent phonon generation and detection by picosecond light pulses | Using the picosecond pump and probe technique we have detected oscillations of photoinduced transmission and reflection in thin films of α-As2Te3 and cis-polyacetylene. These oscillations are due to the generation and propagation of coherent acoustic phonons in the film. We discuss the generation ... | a-As2Te3; Cis-polyacetylene; Pump and probe technique | 1984-09 |
| 268 |
 |
Capecchi, Mario R. | Synthesis of an ochre suppressor tRNA gene and expression in mammalian cells. | We have used site-specific mutagenesis to change the anticodon of a Xenopus laevis tyrosine tRNA gene so that it would recognize ochre codons. This tRNA gene is expressed when amplified in monkey cells as part of a SV40 recombinant and efficiently suppresses termination at both the ochre codon separ... | Xenopus; Nucleic Acid Conformation; Kidney; DNA Restriction Enzymes | 1984-11 |
| 269 |
 |
Davidson, Diane W. | Granivory in the Chihuahuan Desert: interactions within and between trophic levels | We investigated the effects of Chihuahuan Desert granivores on three seasonal classes of plant resource species, the effects of these resource classes on one another, and the ways in which interactions through plant resources affect the abundances of seed consumers. At our study site, three seasona... | Annual plant; Ant; Competition; Community; Desert; Ecosystem structure; Experiment; Granivore; Indirect interaction; Rodent; Population cycles; Seed predation | 1985 |
| 270 |
 |
Williams, Clayton C. | High-resolution photothermal laser probe | An advance in photothermal imaging is described. A photothermal laser probe is presented that operates at a frequency of 1 GHz. At this frequency the spacial resolution is limited only by the optical spot size of the probe beam. The photothermal sensitivity of the probe is 1.2 X 10-4 degrees Celsiu... | Laser probes | 1985 |
| 271 |
 |
Ailion, David Charles; Morris, Alan H. | Asymmetric spin echo sequences. a simple new method for obtaining NMR 1H spectral images | The nuclear magnetic resonance (NMR) signal decay produced by reversible tissue-induced dephasing of the magnetization components in the transverse plane (reversible tissue-induced dephasing) was measured and expressed as a function of a new transverse relaxation time T'2 (T2 prime) for samples of ... | Asymmetric spin echo; Signal decay; Chemical shift; Tissue characterization; Lung aeration; Fatty liver | 1985 |
| 272 |
 |
Mattis, Daniel C. | Tricritical point in random-field Ising model | The numerical investigation of the random-field Ising model by Houghton, Khurana, and Seco1 has revealed a number of interesting features concerning the three-dimensional Ising model in a random external field Bt. Earlier, Aharony2 had already found that even in a mean-field approximation the b... | Random external field; Tricritical points; Gaussian distribution | 1985 |
| 273 |
 |
Symko, Orest George | Spin glass behavior of Cd1-xMnxTe below the nearest-neighbor percolation limit | Magnetization measurements down to 10 mK of Cd, _ x Mn, Te for Mn concentrations 0.01<x<0.15 show spin glass behavior. Such behavior is attributed to short-range exchange and dipolar interactions. Both interactions are used to explain the concentration dependence of the spin freezing temperatures fo... | Spin glass behavior; Cd1-xMnxTe | 1985 |
| 274 |
 |
Vardeny, Zeev Valentine | Effect of bias illumination on photoinduced absorption decay in ?-Si:H | Zeldov and Weiser1 proposed a model to explain the influence of optical biasing on the decay of photoinduced absorption (PA) in ?-Si:H at high temperatures observed by Pfost, Vardeny, and Tauc.2 This model differs from the model originally used2 for interpreting the experimental data at temperatures... | Optical biasing; Bias illumination; Photoinduced absorption decay; a-Si:H; Amorphous silicon | 1985 |
| 275 |
 |
Ailion, David Charles | Commensurability and defect-induced phason gaps in incommensurate systems | The phason energy gap has been observed to increase on going from the incommensurate to higher-order commensurate phases in the "devil's staircase" compound [N(CH3)4]2ZnCl4. The gap was determined via the phason-induced 1 4N spin-lattice relaxation contribution, which was obtained from the variati... | Phasons; Commensurate; Incommensurate; Lattices; Modulation | 1985 |
