Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"pair formation"”.
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Visualizing Cooper Pair Formation on the Atomic Scale in High Temperature Superconductors
… debated issue is the temperature at which Cooper pairs first form. Do pairs form at the critical temperature Tc or do they form at higher temperatures lacking phase rigidity? To answer the question, we have developed new techniques, based on scanning tunneling microscopy, to visualize the process …
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Molecular Genetic Characterization of the Mating Pair Formation and Vegetative Replication Regions on the Agrobacterium Tumefaciens Ti Plasmid pTiC58
… with the trb genes of RP4, which encode mating pair formation (Mpf) functions essential for conjugation, as well as with other genes from the type IV secretion family. Expression of the Ti trb genes required the traI promoter, TraR, and AAI. Genetic studies showed that non-polar insertion …
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Ion-molecule reaction mass spectrometry and vacuum-ultraviolet negative photoion spectroscopy
… Product anions resulting from unimolecular ion-pair dissociation reactions were detected, and their ion yields recorded in the range 8-35 eV. Absolute cross sections for ion-pair formation and resulting quantum yields are calculated. This vast collection of data is summarised and ion-pair …
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The ion exchange behaviour of some trivalent cations in aqueous monoethanolamine
… groups and counter-ions ; 2) an increase in ion-pair formation, resulting in a decrease in the number of osmotically active ions in the resin phase, and tin accompanying reduction in the osmotic pressure difference between resin and solution phases;3) an increase in association between resin …
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Structural and Electrical Properties of In and C + In implanted Ge, Si, and Si₁ˍₓGeₓ
… atoms occupy a substitutional lattice site. The formation of metallic In precipitates and In-vacancy complexes are apparent for In concentrations greater than 0.6 atomic percent. Electrical measurement results were correlated with the determined structural properties. Aiming to enhance the …
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Structural and Electrical Properties of In and C + In implanted Ge, Si, and Si₁ˍₓGeₓ
… atoms occupy a substitutional lattice site. The formation of metallic In precipitates and In-vacancy complexes are apparent for In concentrations greater than 0.6 atomic percent. Electrical measurement results were correlated with the determined structural properties. Aiming to enhance the …
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Effect of temperature-induced membrane lipid phase transition in recipient cells on conjugation in Escherichia coli K-12
… at the growth temperature of 39.5 C. Neither pair formation nor maintenance of plasmid once stably inherited appear to be affected by the onset of a membrane lipid phase transition. Furthermore, transfer of ³H-thymidine labeled DNA from donor to recipient cell is only minimally affected by the …
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Breeding Behavior and Reproductive Success of Chipping Sparrows in Northwestern Minnesota
… smaller loss in reproductive success. Four pairs raised two broods in one season. Males assumed nearly all care of first brood fledglings, freeing the female to build a second nest. This strategy of parental care may improve the chances of a pair having a second brood.</p><p>Pair …
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Studies of Highly Polar Atomic and Molecular Systems: Quantum Dynamics and the Route to Experimental Investigations
… states of the lithium atom at 447 kV/m. Ion-pair formation from two neutral lithium atoms, one in the 2s ground state and the other in an excited state, is also investigated. The cross section σ(v) for free ion-pairs is calculated for the initial colliding pairs of atomic states located below …
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The sociality, ontogeny, and function of corvid post-conflict affiliation
… with their mate because they are monogamous; the pair-bond being by far the highest quality relationship in the group. My results showed that the social species have third-party affiliation with their mate, while the less social jays have third-party affiliation with anyone. This behaviour became …
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Winter and Spring Ecology of Gray Partridge in East Central South Dakota
… deep snow. In early spring during dispersal, pair formation, and selection of nesting territories, partridge utilized a greater variety of habitat types. Partridge utilized row crops and idle areas for this period in 1980. Birds utilized idle areas in late spring during the nesting period in …
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Mate choice in the Polychaete nereis acuminata : the role of aggression and parental experience
… life cycle. A male and female form a monogamous pair bond, the female lays eggs and dies. The male then fertilises the egg and undertakes sole parental care until the eggs hatch and larvae leave the parental burrow; the male can then reproduce again. This body of work investigated aggression, …
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Breeding and Nesting Behavior and Habitat of the Red-billed Pigeon (Columbia flavirostris) along the Rio Grande River in Texas
… along the Rio Grande River. Courtship and pair formation behaviors were observed during the 2000 and 2001 breeding seasons. Behaviors and vocalizations observed were similar to behaviors described for other pigeon species. Twelve instances of nesting activity were observed during this …
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Vocalizations Of Adult American Kestrels (falco Sparverius): Effect Of Breeding Stage, Sex, And Context On Call Use And Characteristics
… an adult. Chitter calls appear to play a role in pair formation and communication between mates before and after females begin incubating eggs, possibly informing mates of their approach or, as with whine calls, soliciting the approach of a mate. Analysis of how American Kestrels use and vary the …
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Heats of Dissolution of Several Imidazolium-Based Ionic Liquids into Low Dielectric Media
… presence of particularly stable, long-lived ion pairs for several different imidazolium-based ILs dissolved in chloroform, as evidenced in prior research by the presence of two resonance sets in 1H NMR spectra.1 Specifically, it was shown that the variation of experimental conditions such as …
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INVESTIGATIONS OF OXIDE AND SULFIDE BASED LOW DIMENSIONAL NANO STRUCTURES FOR CONDUCTOMETRIC GAS SENSORS, MEMRISTORS AND PHOTODETECTORS
… light in visible range can induce electron-hole pair formation. Furthermore, gas sensing (CO, H2) measurements taken under visible light irradiation imply that photo-activated chemical oxidization on the surface of TiO2 nanowires occurs, which is responsible for the observed measurements. …
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Automated Synthesis of Duplex-Forming Recognition-Encoded Oligomers
… alkyne groups, was synthesised via SPS. Duplex formation in dichloromethane was investigated by using the copper-catalysed azide-alkyne cycloaddition (CuAAC) reaction to trap the species present. LCMS was used to identify the macrocyclic self-complementary duplex as a major product. This …
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Templated synthesis of synthetic oligomers
… homo-oligomers undergo cooperative duplex formation, and hetero 3-mers form sequence-selective duplexes. H-bond templated synthesis of a similar melamine oligomer was attempted in toluene, but the template was inefficient at promoting the formation of sequence-complementary oligomers. The …
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Comparison of transport effects of perfluorinated and hydrocarbon surfactants on environmental co-contaminants
… of environmental pollutants. While much information is known about HCS, little to no information is available for the perfluorinated surfactants (PFSs). The overall objective of this research was to determine the transport effects of PFSs on known environmental contaminants, in comparison …
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Supercritical Fluid Chromatography of Ionic Compounds
… Modification of the stationary phase and ion pairing with the analyte are two possible retention mechanisms being considered. As ion-pair formation was considered to be one of the retention mechanisms, the use of sodium sulfonates as mobile phase additives to elute secondary and quaternary …
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