UScholar Works
 
Filters: Date: "1991" School Or College: "College of Science" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Golden, Kenneth M.Arbitrarily slow approach to limiting behaviorABSTRACT. Let f(k, t): RN x [0, oo) -- R be jointly continuous in k and t, with lim(t)--(oo) f(k, t) = F(k) discontinuous for a dense set of k's. It is proven that there exists a dense set T of k's such that, for k e T , |f(k, t) - F(k)| approaches 0 arbitrarily slowly, i.e., roughly speaking, more ...Random; Conductivity; Diffusion1991
2 Golden, Kenneth M.Classical transport in quasiperiodic mediaAbstract. Classical transport coefficients such as the effective conductivity or diffusivity of a quasiperiodic medium were observed [1] to depend discontinuously on the frequencies of the quasiperiodicity. For example, for a one-dimensional medium with a potential V(x) = cosx + coskx , the effecti...Transport; Diffusion; Random1991
3 Olivera, Baldomero M.; Hillyard, David R.ConotoxinsMany successful animal and plant families have developed distinctive biochemical strategies; one of the more unusual examples is found in a group of marine gastropods, the cone snails (Conus) (1). These animals have evolved a specialized biochemistry of small constrained peptides, the conotoxins. Th...Conotoxins1991
4 Bohs, Lynn A.Crossing studies in Cyphomandra (Solanaceae) and their systematic and evolutionary significanceA crossing program involving eight species of Cyphomandra was instituted to elucidate systematic relationships between the taxa and evolutionary mechanisms operating in the genus. The results show that gametophytic self-incompatibility is widespread in Cyphomandra. Pollen tubes were able to reach ...Solanum maternum; Crossing studies1991
5 Bastiani, MichaelDevelopmental expression of REGA-1, a regionally expressed glial antigen in the central nervous system of grasshopper embryosGlial cells are a large component of the developing nervous system, appearing before the onset of axon outgrowth in a variety of developing systems. Their time of appearance and their location in conjunction with developing axon pathways may allow them to define the position of axon pathways.Antibody; Axons; Pathways1991
6 Vardeny, Zeev ValentineFemtosecond dynamics of the nonlinear optical response in polydiethynylsilaneWe have measured the femtosecond dynamics of the nonlinear optical response xc3' in polydiethynylsilane ( C4H2SiBu2)x, a novel class of r-conjugated polymers incorporating Si, using degenerate four-wave mixing and photoinduced absorption techniques. In resonance conditions at 620 nm we found x (3) ...Polydiethynylsilane; Femtosecond dynamics; Nonlinear optical response; Pi-conjugated polymers1991
7 Gesteland, Raymond F.; Atkins, John F.Frameshifting in gene 10 of bacteriophage T7Gene 10 of bacteriophage T7, which encodes the most abundant capsid protein, has two products: a major product, 10A (36 kDa), and a minor product, 10B (41 kDa). 10B is produced by frameshifting into the -1 frame near the end of the 10A coding frame and is incorporated into the capsid. The frameshift...Frameshifting; Bacteriophage T7; RNA, Viral; Gene Expression1991
8 Morse, Michael DavidThe ground state and excited ?-hole states of CuAuResonant two-photon ionization spectroscopy has been applied to jet-cooled diatomic CuAu. Eight band systems have been observed, rotationally resolved, and analyzed. The ground state is X??+ in symmetry, deriving from the 3d??Cu 5d??Au, ?? molecular configuration. Its bond length has been determined...1991
9 Miller, Joel Steven; Epstein, Arthur J.Novel co-operative magnetic properties of decamethylmanganocenium 2,3-dichloro-5,6-dicyanobenzoquinoneide, 3[Mn(C5Me5)2]:+[DDQ].-The electron-transfer salt 3[Mn(C5Me5)2]: + [DDQ].-, isomorphous to orthorhombic [Fe(C5Me5)2].+[DDQ].-, has been prepared. It exhibits a complex field-dependent magnetic phase diagram at low temperatures with evidence for ferromagnetic coupling as well as a low moment state below 4 K for zero-field ...Ferromagnetic; Electron-transfer salt; Powder diffraction1991
10 Symko, Orest George; Vardeny, Zeev ValentineQuasiparticle relaxation in a high-Tc superconductorRecent measurements by Eesley et al. [1] of transient reflectivity in superconducting Tl2Ba2Ca2Cu30io were interpreted as evidence for order-parameter relaxation in the vicinity of Tc, which was analyzed in terms of BCS weak coupling for A(r)/A(0). In this Comment we question this interpretation ...Quasiparticle relaxation; High-tc1991
11 Vardeny, Zeev Valentine; Symko, Orest GeorgeQuasiparticle relaxation in high-Tc superconductorRecent measurements by Eesley et al. [1] of transient reflectivity in superconducting Tl2Ba2Ca2Cu30io were interpreted as evidence for order-parameter relaxation in the vicinity of Tc, which was analyzed in terms of BCS weak coupling for ?(r)/?(0). In this Comment we question this interpretation ...Quasiparticle relaxation1991
12 Morse, Michael DavidResonant two-photon ionization spectroscopy of coinage metal trimers: Cu?Ag, Cu?Au, and CuAgAuThe jet-cooled coinage metal triatomic molecules Cu, Ag, Cu, Au, and CuAgAu have been investigated using resonant two-photon ionization spectroscopy. One band system, labeled as the ?-x system, has been observed for each species, with origin bands at 13 188, 17 217, and 17 470 cm -?, respectively. ...1991
13 Morse, Michael DavidResonant two-photon ionization spectroscopy of jet-cooled Au?A band system of jet-cooled Au, has been located in the near infrared region of the spectrum using resonant two-photon ionization spectroscopy. The origin band is located at 13 354.15 cm-? and the system extends more than 700 cm-? further to the blue. The excited state displays a radiative lifetime...1991
14 Miller, Joel StevenRoom temperature molecular/organic-based magnetThe Du Pont / Ohio State University research team made materials in the laboratory, then tested them for magnetism. To do so, they initially moved a magnet along the outside of a sealed tube containing a small blob of experimental material and an inert gas such as argon or nitrogen. "We've done it...Bis(benzene)vanadium; Vanadium; Tetracyanoethylene; TCNE; Polymeric magnets; Room temperature1991
15 Morse, Michael DavidSpectroscopic studies of jet-cooled AgAu and Au?Resonant two-photon ionization spectroscopy has been applied to the jet-cooled Au? and AgAu molecules. Three new band systems of Au? and two new systems of the poorly characterized AgAu molecule have been observed. Excited state lifetime measurements have been made, and assignments of the excited s...1991
16 Morse, Michael DavidSpectroscopic studies of jet-cooled CuAgResonant two-photon ionization spectroscopy has been applied to jet-cooled diatomic CuAg. Four band systems have been observed, three of which have been rotationally resolved and analyzed. The ground state is X ??+ in symmetry, deriving from the 3d??cu4d??Ag?? molecular configuration. Its bond lengt...1991
17 Vardeny, Zeev ValentineStudies of resonant and preresonant femtosecond degenerate four-wave mixing in unoriented conducting polymersDegenerate four-wave mixing with femtosecond time resolution is used to measure the magnitude and transient response of the third-order nonlinear optical susceptibility x(3) (ω;ω, -ω,ω) at 620 nm in nonoriented conducting polymers including polydiacetylene, polyacetylene, polyaniline, polydieth...Pi-conjugated polymers1991
18 Capecchi, Mario R.; Thomas, Kirk R.Swaying is a mutant allele of the proto-oncogene Wnt-1Mice homozygous for the recessive mutation swaying (SW) are characterized by ataxia and hypertonia, attributed to the malformation of anterior regions of the cerebellum. We show that SW is a deletion of a single base pair from the proto-oncogene Wnf-1. The deletion is predicted to cause premature t...Swaying allele; protooncogene Wnt-1; Mutant genes; Mutant alleles1991
19 Miller, Joel Steven; Epstein, Arthur J.Three-dimensional ordering, spin excitations, and dilution effects in the quasi-1-D ferromagnetic (DMeFc)(TCNE)The linear chain S = (1/2) molecular ferromagnet decamethylferrocenium tetracyanoethanide [(DMeFc) (TCNE)] has been studied by frequency-dependent ac susceptibility experiments. (X')(T) and (X") (T) exhibit maxima in the temperature range of 4.8 - 4.9 K, which corresponds to the transition tempe...Temperature; Transition; Magnetic1991
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