Cooper Pairs
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Estudo e geração de estados não clássicos em nanocircuitos: propriedades e aplicações / Study and generation of nonclassical states in nanocircuits: properties and aplications
In this work we used an arrangement consisting of Cooper pairs (Cooper Pair Box, CPB) interacting with a nanomechanical Resonator (NR) for various studies: to produce controlable holes in the statistical distribution of excitations of the NR, for resonant and non-resonant cases; to study the evolution of the entropy and the inversion of excitations, includin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2012
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2. Reduced folate carrier 1 (RFC1) is associated with cleft of the lip only
In this report, we have reanalyzed genotyping data in a collection of families from South America based on maternal origin. Genotyping analysis was performed at the Craniofacial Anomalies Research Center at the University of Iowa. These genotypes were derived from genomic DNA samples obtained from blood spots from children born with isolated orofacial clefts
Brazilian Journal of Medical and Biological Research. Publicado em: 2008-08
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3. Impurity resonances and the origin of the pseudo-gap
We study the structure of resonance states localized around nonmagnetic impurities in the CuO2 planes of the cuprate superconductors within a potential scattering formalism. In particular we show that strong quantum interference effects arise between several impurities. This interference can be utilized to distinguish the dwave superconducting state from the
Brazilian Journal of Physics. Publicado em: 2003-12
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4. Theoretical prediction of the fractional ac Josephson effect in p- and d-wave superconductors
For certain orientations of Josephson junctions between two p x-wave or two d-wave superconductors, the subgap Andreev states produce a 4pi-periodic relation between the Josephson current I and the phase difference f: I µ sin( f/2). Consequently, the ac Josephson current has the frac
Brazilian Journal of Physics. Publicado em: 2003-12
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5. Cooper pairing and superconductivity in a spin fluctuation model for high-Tc cuprate superconductors
We study the formation of Cooper pairs in high-Tc cuprate superconductors within a spin uctuation model for doped quantum Heisenberg antiferromagnets. The charge of the dopants (chargons) is associated to quantum skyrmion excitations of the Cu++ antiferromagnetic spin background. We then compute the quantum skyrmion e effective interaction potential as a fun
Brazilian Journal of Physics. Publicado em: 2002-09
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6. VORTEX STATES IN UNCONVENTIONAL SUPERCONDUCTORS / ESTADOS DE VORTICES EM SUPERCONDUTORES NAO-CONVENCIONAIS
The theory of Bardeen, Cooper and Schrieffer (BCS) had great success in explaining most properties of superconducting materials. These materials, where BCS applies, are denominated conventional superconductors. the experimental evidence of unconventional superconductivity in several materials reopened discussions about the phenomenon. While, in conventional
Publicado em: 2002
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7. Independent origins of New Zealand moas and kiwis.
Two groups of flightless ratite birds existed in New Zealand during the Pleistocene: the kiwis and the moas. The latter are now extinct but formerly included 11 species. We have enzymatically amplified and sequenced approximately 400 base pairs of the mitochondrial 12S rRNA gene from bones and soft tissue remains of four species of moas as well as eight othe
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8. Extension of the transcriptional and translational map of the left end of the vaccinia virus genome to 21 kilobase pairs.
Physical, transcriptional, and translational maps of an EcoRI fragment located between 15,800 and 20,600 base pairs from the left end of the vaccinia virus genome were prepared. Major polypeptides with molecular weights of 14,000 (14K polypeptide), 32,000 and 38,000 were synthesized in a reticulocyte cell-free system programmed with immediate early RNA made
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9. Initial recovery of vision after early monocular deprivation in kittens is faster when both eyes are open
A comparison was made of the speed of visual recovery in the deprived eye of kittens after a 6-day period of monocular deprivation imposed at 5–9 weeks of age in two postdeprivation conditions. In one condition, binocular recovery (BR), both eyes were open, whereas in the other condition, reverse lid-suture (RLS), the formerly nondeprived eye was clos
The National Academy of Sciences.
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10. Geometry of a branched DNA structure in solution.
An approximate geometry of a stable, four-way DNA junction has been determined in free solution by applying the technique of transient electric birefringence. The current approach consists of (i) construction of a set of six molecules in which two of the four arms of a synthetic junction are elongated by approximately 9-fold (in each of the six possible two-
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11. Characterization of the yeast KEX1 gene product: a carboxypeptidase involved in processing secreted precursor proteins.
We have identified and partially characterized the Saccharomyces cerevisiae KEX1 gene product, Kex1p, to assess its role in processing secreted protein precursors. Anti-Kex1p antibodies identified a 113-kilodalton protein that was absent in cells in which the KEX1 gene has been disrupted and that was more abundant in cells overexpressing the KEX1 gene. Kex1p
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12. Hybridization selection and cell-free translation of mRNA's encoded within the inverted terminal repetition of the vaccinia virus genome.
Early polypeptides encoded within the 10,000-base pair terminally repeated region of the vaccinia virus genome were mapped by cell-free translation of mRNA that was selected by hybridization to restriction fragments and to separated strands of a recombinant lambda phage. The results, which were confirmed by hybrid arrest of translation, indicated that polype