UScholar Works
 
Filters: School Or College: "College of Science" Collection: "ir_uspace" Format: "application/pdf"
126 - 150 of 1,923
Number of results to display per page
CreatorTitleDescriptionSubjectDate
126 Wu, Yong-ShiGround-state degeneracy in the Levin-Wen model for topological phasesWe study the properties of topological phases by calculating the ground-state degeneracy (GSD) of the two-dimensional Levin-Wen (LW) model. Here it is explicitly shown that the GSD depends only on the spatial topology of the system. Then we show that the ground state on a sphere is always nondegener...2012-01-01
127 Golden, Kenneth M.The lsing model and critical behavior of transport in binary composite mediaWe present a general theory for critical behavior of transport in binary composite media. The theory holds for lattice and continuum percolation models in both the static case with real parameters and the quasi-static case (frequency dependent) with complex parameters. Through a direct, analytic cor...2012-01-01
128 Gerton, JordanEffect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphologyWe studied the effect of magnetic doping with Gd atoms on the superconducting properties of amorphous Mo70Ge30 films. We observed that in uniform films deposited on amorphous Ge, the pair-breaking strength per impurity strongly decreases with film thickness initially and saturates at a finite value ...2012-01-01
129 Ehleringer, James R.Bayesian integration of isotope ratio for geographic sourcing of castor beansRecent years have seen an increase in the forensic interest associated with the poison ricin, which is extracted from the seeds of the Ricinus communis plant. Both light element (C, N, O, and H) and strontium (Sr) isotope ratios have previously been used to associate organic material with geographic...2012-01-01
130 Goller, FranzProsthetic Avian vocal organ controlled by a freely behaving bird based on a low dimensional model of the biomechanical peripheryBecause of the parallels found with human language production and acquisition, birdsong is an ideal animal model to study general mechanisms underlying complex, learned motor behavior. The rich and diverse vocalizations of songbirds emerge as a result of the interaction between a pattern generator i...2012-01-01
131 Jorgensen, ErikUNC-41/stonin functions with AP2 to recycle synaptic vesicles in Caenorhabditis elegansThe recycling of synaptic vesicles requires the recovery of vesicle proteins and membrane. Members of the stonin protein family (Drosophila Stoned B, mammalian stonin 2) have been shown to link the synaptic vesicle protein synaptotagmin to the endocytic machinery. Here we characterize the unc-41 gen...2012-01-01
132 Clayton, Dale H.How effective is preening against mobile ectoparasites? An experimental test with pigeons and hippoboscid fliesBirds combat ectoparasites with many defences but the first line of defence is grooming behaviour, which includes preening with the bill and scratching with the feet. Preening has been shown to be very effective against ectoparasites. However, most tests have been with feather lice, which are relati...2012-01-01
133 Lupton, John MarkExciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: electric field effects on exciton and multiexciton statesCdSe/CdS nanocrystal tetrapods are interesting building blocks for excitonic circuits, where the flow of excitation energy is gated by an external stimulus. The physical morphology of the nanoparticle, along with the electronic structure, which favors electron delocalization between the two semicond...2012-01-01
134 Lupton, John MarkSlow hopping and spin dephasing of coulombically bound polaron pairs in an organic semiconductor at room temperaturePolaron pairs are intermediate electronic states that are integral to the optoelectronic conversion process in organic semiconductors. Here, we report on electrically detected spin echoes arising from direct quantum control of polaron pair spins in an organic light-emitting diode at room temperature...2012-01-01
135 Olivera, Baldomero M.Stapling mimics noncovalent interactions of γ-carboxyglutamates in conantokins, peptidic antagonists of N-methyl-D-aspartic acid receptorsBackground: Can dicarba bridges (stapling) replace noncovalent interactions that stabilize helical conformation of neuroactivepeptides? Results: A rational design, synthesis, structural, and functional characterization of stapled conG analogs that target NMDAreceptors is reported. Conclusion: Staple...2012-01-01
136 Lupton, John MarkProbing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scatteringA crucial consideration in organic devices is the role of the interface between a metal electrode and the active polymer material. Here, we use the conjugated polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene] (MEH-PPV) with model gold and silver electrodes to perform surface-enhanc...2012-01-01
137 Loftus, Patrick David; Rosenblatt, Jody; Eisenhoffer Jr., George ThomasInduced pressure promotes extrusion and transient polyp formation in MDCK monolayers to maintain homeostasisIn the human body about 100,000 cells are produced every second by mitosis and a similar number die by apoptosis. What happens if too much death occurs? What happens if too little death occurs? How are dying epithelial cells removed?Extrusion; MDCK monolayers; Polyp formation; Trapeze Interactive Poster2010-03-15
138 Kieda, David B.; Binks, Joshua ThomasGamma-ray emission by the BL Lac Markarian 501Optical astronomy is the study of the heavens as they emit light, or the visible portion of the electromagnetic spectrum. Gamma-ray astronomy is the study of astrophysical sources that emit the most energetic form of electromagnetic radiation (ie: gamma-rays). High Energy gamma-rays are much too f...Markarian 501; Gamma-ray emission; Trapeze Interactive Poster2010-03-15
139 Armentrout, Peter B.Guided ion beam and theoretical studies of sequential bond energies of water to sodium cysteine cationAbsolute bond dissociation energies of water to sodium cysteine (Cys) cations and cysteine to hydrated sodium cations are determined experimentally by collision-induced dissociation of Na+Cys(H2O)x, where x = 1 - 4, complexes with xenon in a guided ion beam mass spectrometer. Experimental results sh...2010-01-01
140 Potts, Wayne K.MHC signaling during social communicationThe major histocompatibility complex (MHC) has been known to play a critical role in immune recognition since the 1950s. It was a surprise, then, in the 1970s when the first report appeared indicating MHC might also function in social signaling. Since this seminal discovery, MHC signaling has been f...2012-01-01
141 Vardeny, Zeev ValentinePhotoexcitation dynamics in polythiophene/fullerene blends for photovoltaic applicationsWe used the transient and steady state photomodulation spectroscopies for studying the photoexcitations dynamics in blends of regio-regular poly(3-hexylthiophene) (RR-P3HT) and fullerene in a broad spectral range from 0.15 to 2.25 eV. We found that both localized polarons and singlet excitons are in...2012-01-01
142 Sekercioglu, CaganIbis questThe day I arrived in Ethiopia, researcher Yilma Dellelegn Abebe of the Ethiopia Wildlife and Natural History Society (EWNHS) was just leaving the capital city, Addis Ababa, to search for three Northern Bald Ibises in a remote, roadless area of the country. These critically endangered birds had been ...2007-01-01
143 Sekercioglu, CaganLandscape constraints on functional diversity of birds and insects in tropical agroecosystemsIn this paper, we analyze databases on bird and insects to assess patterns of functional diversity in human-dominated landscapes in the tropics. Perspective from developed landscapes is essential for understanding remnant natural ecosystems, because most species experience their surroundings at spat...2008-01-01
144 Sekercioglu, CaganForest fragmentation hits insectivorous birds hardHabitats around the world, especially in the tropics, are being fragmented at a rapid rate, causing a tremendous loss of biodiversity[1]. For example, 12% of the approximately 10,000 bird species are threatened with extinction in the next 10 to 100 years, and another 8% are near-threatened[2]. This ...2002-01-01
145 Sekercioglu, CaganThe need to quantify ecosystem services provided by birdsWhat are birds worth-what is their actual dollar value to human society? To most of us in the ornithological community, birds are invaluable. But in these times we need more specific rationales to convince policy makers and business leaders to include bird conservation in land-use and development de...2011-01-01
146 Sekercioglu, CaganCauses and consequences of bird extinctionsIncreased human domination of the planet has caused the declines and extinctions of countless species. Each species has not only intrinsic value, but ecological functions of organisms are also essential for the integrity of ecosystems that allow people to benefit from essential free ecosystem servic...2003-01-01
147 Sekercioglu, CaganPeople skills for the conservation professionalConservation scientists are increasingly becoming aware of the importance of the human aspects of conservation, and in conservation circles, ‘‘social science'' is the word of the day. There is a rapidly growing social science working group in the Society for Conservation Biology and it is hard t...2008-01-01
148 Sekercioglu, CaganChewing lice (phthiraptera) species found on birds along the Aras River, lgdir, Eastern TurkeyChewing lice were sampled from the birds captured and ringed between September-October 2009 at the Aras River (Yukarı Çıyrıklı, Tuzluca, Iğdır) bird ringing station in eastern Turkey. Eighty-one bird specimens of 23 species were examined for lice infestation. All lice collected from the birds...2011-01-01
149 Sekercioglu, CaganChewing lice (phthiraptera) found on songbirds (Passeriformes) in TurkeyObjective: This study was performed to detect chewing lice species found on the songbirds at Lake Kuyucuk bird ringing station in the Kars province located in eastern Turkey. Methods: Chewing lice were collected from songbirds captured between September and October 2009. Fifty-one birds belonging t...2011-01-01
150 Sekercioglu, CaganThe worldwide variation in avian clutch size across species and spaceTraits such as clutch size vary markedly across species and environmental gradients but have usually been investigated from either a comparative or a geographic perspective, respectively. We analyzed the global variation in clutch size across 5,290 bird species, excluding brood parasites and pelagic...2008-01-01
126 - 150 of 1,923