UScholar Works
 
Filters: Date: "1984" School Or College: "College of Science" Collection: ir_uspace
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CreatorTitleDescriptionSubjectDate
1 Davidson, Diane W.Dispersal adaptations of some acacia species in the Australian arid zoneMost 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 nutrients1984
2 Blair, David F.Electron spin relaxation of CuA and cytochrome a in cytochrome c oxidase: comparison to heme, copper, and sulfur radical complexesThe 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 complexes1984
3 Potts, Wayne K.Fall migration of Golden Eagles in the Wellsville Mountains, Northern Utah, 1976-1979Migratory 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 migration1984
4 Davidson, Diane W.Granivory in a desert ecosystem: experimental evidence for indirect facilitation of ants by rodentsTwo major groups of desert granivores, ants and rodents, coexist as permanent residents of local desert habitats in southwestern North America. At our Sonoran Desert study site, both of the major taxa exhibited short-term increase in density when the other taxon was experimentally removed. Over the...Ants; Arizona; Desert annuals; Facilitation; Granivory; Indirect mutualism; Rodents; Seed predation; Sonoran Desert1984
5 Coley, Phyllis D.Guía de los arboles comunes del Parque Nacional Soberanía, PanamáEsta es una guía con dibujos para las cincuenta especies de árboles más comunes del bosque tropical en los alrededores del Parque Soberanía, Panamá. También se incluyen siete especies de hierbas y cuatro herbáceas grandes que sobresalen en el sotobosque (bosque bajo). Aunque en el área del p...Arboles; Arbustos1984
6 Williams, Clayton C.High resolution photothermal laser probeAt frequencies near 1 GHz, the acoustic wavelength in argon gas becomes half that of visible light, making possible collinear Bragg scattering of laser light by the sound. This acousto-optic interaction has been used to detect photothermally generated acoustic power at the surface of solids. This ne...Photothermal laser probe; Silicon wafer1984
7 Wu, Yong-ShiMassless fermions and Kaluza-Klein theory with torsionA pure Kaluza-Klein theory contains no massless fermion in four-dimensional theory. We investigate the effect of introducing torsion on the internal manifold and find that there are massless fermions. The hope is that given an isometry group the representation to which these fermions belong is fixe...Massless fermions; Four-dimensional theory; Torsion1984
8 Beckerle, Mary C.Microinjected fluorescent polystyrene beads exhibit saltatory motion in tissue culture cellsMicroinjected 0.26-um fluorescent, carboxylated microspheres were found to display classical saltatory motion in tissue culture cells . The movement of a given particle was characterized by a discontinuous velocity distribution and was unaffected by the activity of adjacent particles.Organelles; Microscopy; Proteins1984
9 Ailion, David CharlesMolecular reorientations in the ordered phases of KCN and NaCN studied by NMRWe have measured 13C and 23Na NMR spin-lattice relaxation times as a function of temperature in KCN and NaCN in order to study the head-to-tail reorientations of the CN- molecules in the two low-temperature ordered phases. We have combined our data with those of dielectric-response and ionic-thermal...Spin; Interactions; Fluctuations1984
10 Ehleringer, James R.Orientation and slope preference in barrel cactus (Ferocactus acanthodes) at its northern distribution limitMicrosite 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 preference1984
11 Bastiani, MichaelPathfinding by neuronal growth cones in grasshopper embryo: III. Selective affinity of the G growth cone for the P cells within the A/P fascicleThe growth cone of the G neuron selectively fasciculates upon specific axon bundles in a stereotypic sequence as it navigates through the developing central nervous system of the grasshopper embryo. It turns and extends anteriorly in the contralateral neuropil of the second thoracic ganglion at a s...Axon; Filopodia; Neuropil1984
12 Bastiani, MichaelPathfinding by neuronal growth cones in grasshopper embryos: IV. The effects of ablating the A and P axons upon the behavior of the G growth coneIn the companion paper (Bastiani, M. J., J. A. Raper, and C. S. Goodman (1984) J. Neurosci. 4: 2311-2328), we show that as the G growth cone reaches its choice point and turns anteriorly on the A/P fascicle, its filopodia demonstrate selective affinity for the A/P fascicle as compared to the other a...Labeled pathway; Anterior extension; Fascicle1984
13 Mattis, Daniel C.Phonon model of vacancy-interstitial pair formation in solidsBonds 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; Homogeneous1984
14 Vardeny, Zeev ValentinePhotoconductivity and photoinduced absorption in a-Si:F and a-Si:HThe photoconductivity (PC) and photoinduced absorption (PA) of RF glow discharge a-Si:F and a-Si:H samples is reported. The value of the room temperature PC of a-Si:F is lower by some four orders of magnitude relative to that of a-Si:H, but the PA of a-Si:F is found to be significantly higher than t...Photoinduced absorption; a-Si:F; a-Si:H; RF glow discharge; Spin densities1984
15 Vardeny, Zeev ValentinePhotoinduced absorption spectra in amorphous Si:H and Ge:H and microcrystalline Si:HThe steady state subgap photoinduced absorpotion bands in a-Ge:H and a-Si:H are interpreted in terms of two kinds of optical transitions of photoexcited carriers from traps in the gap into the bands of which one produces absorption and the other produces bleaching. The photoinduced absorption in mic...Photoinduced absorption; Si:H; Ge:H; Amorphous silicon; Amorphous germanium; Microcrystalline silicon1984
16 Vardeny, Zeev ValentinePicosecond optical generation and detection of phonon waves in a-As2Te3Using the pump and probe technique we have observed oscillations of photoinduced transmission in thin films of a-As2Te3. The oscillations have periods of 70-240 ps, depending on sample thickness. We ascribe these to phonon propagation in the films. Thermal expansion and carrier deformation potenti...Picosecond optical generation; a-As2Te3; Pump and probe technique1984
17 Olivera, Baldomero M.Poly(ADP-ribosylation) of DNA topoisomerase I from calf thymusWe demonstrate that the activity of the major DNA topoisomerase I from calf thymus is severely inhibited after modification by purified poly(ADP-ribose) synthetase. Polymeric chains of poly(ADP-ribose) are covalently attached to DNA topoisomerase I. These observations with highly purified enzymes ...ADP-ribosylation; Poly(ADP-ribose) synthetase1984
18 Olivera, Baldomero M.Poly(ADP-ribosylation) of DNA topoisomerase I: a nuclear response to DNA-strand interruptionsDNA in eukaryotic chromosomes is organized differently from prokaryotic DNA. It seems highly probable that mechanistic adjustments have been made in macromolecular DNA metabolism as a consequence of the chromatin structure of the eukaryotic chromosome (Igo-Kemenes et al. 1982)). This paper deals ...Poly(ADP-ribosylation); Poly(ADP-ribose) synthetase; DNA strand interruption1984
19 Olson, Randall J.; Coldwell, Karin D.; Compton, Bruce J.; Giddings, John C.Sedimentation field-flow fractionation: a method for studying particulates in cataractous lensIt 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; Particulates1984
20 Mattis, Daniel C.Three-body bound states on a latticeThe theory of three-body bound states for particles moving on a lattice and interacting with attractive two-body pointlike potentials is presented. The applications are to bosons, fermions (no three-body bound states are found), and magnons. When a three-body bound state forms in three dimensions, i...Particle; Fermions; Ferromagnet1984
21 Armentrout, Peter B.Threshold behavior of endothermic reactions: C+(2P) + H2 → CH+ + HThe reaction C+(2p) + H2 → CH+ + H (1) and its deuterium analog is a model system in ion-molecule chemistry. It is of interest due to its astrophysical significance, because it is an endothermic process, and because the interaction involves several potential energy surfaces. Experimental work ha...Endothermic reactions; Translational energy; Threshold behavior1984
22 Goller, FranzVorkommen und Brut des Bienenfressers (Merops apiaster) in Osttirol (Österreich) (Aves: Meropidae)Synopsis: The first record of Bee-eater for the Eastern Tyrol is imparted by KL1MSCH (1950), three further observations are mentioned. In 1983 a breeding place was discovered near Lavant in about 650 m NN. Feeding adults were watched on the 11th and 12th of August. The breeding place is briefly desc...Merops apiaster; Meropidae; Tyrol1984
23 Mattis, Daniel C.What is the effective mass of an exciton?In the effective-mass approximation, the mass M* of an exciton is just the sum of the electron and hole masses, me*+ mh*. However, the effective-mass approximation is invalid if the forces are strong. Here we derive a plausible formula for the n th bound state of the exciton: Mn*= (me* + mh*) / (...Kinetic; Energy; Electron1984
24 Olivera, Baldomero M.; McIntosh, J. Michael; Gray, William Robertγ-Carboxyglutamate in a neuroactive toxinThe 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; Neurotoxins1984
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