New Resonances
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Studies about personalization of the head-related transfer function in binaural virtual auditory displays. / Estudos sobre personalização da função de transferência relativa à cabeça em sistemas biaurais de reprodução acústica virtual.
This work presents several proposals associated with the optimal use of head-related transfer functions (HRTF) in virtual auditory spaces presented via headphones. These proposals lead to personalization of the HRTF to particular individuals, using a combination of the structural and morphological modeling techniques. In the context of structural modeling, t
Publicado em: 2006
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14. Vibrational excitations mediated by a electronic Feshbach resonance 2Eg+ in electron scattering by hydrogen molecules / Excitações vibracionais medidas pela ressonancia de Feshbach eletronica 2Eg+ no espalhamento de eletrons por moleculas de hidrogenio
The relationship between Feshbach resonances and electronic excitation is well known in electron scattering by Hydrogen molecules, but still little exploited in the positron scattering case, making interesting, a comparative study. However, before thinking about comparisons, we have to address the question if, in fact, a Feshbach resonance manifests itself i
Publicado em: 2006
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15. Spectroscopy of 6Li using the ³He(7Li, alpha)6Li reaction
The spectroscopic study of unbound states in the 6Li nucleus was performed by measuring the energy spectrum of the alpha-particles emitted from the transfer reaction ³He(7Li, alpha)6Li. The 7Li beam at E Lab = 31.2MeV was produced at the São Paulo Pelletron accelerator. A ³He gas cell was used as target. alpha-Particle spectra were measured from thetaLab
Brazilian Journal of Physics. Publicado em: 2004-09
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16. Interação de neutrinos com campos magneticos rotantes
We investigate the possibility of obtaining neutrino magnetic moment experimental limits through controled experiments of chirality conversion. Because right-handed neutrinos do not interact with matter, a suppression detection related to the initial neutrino flux could give us a value to its magnetic moment, or in the absence of such suppression, new experi
Publicado em: 1997
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17. Duplex-hairpin transitions in DNA: NMR studies on CGCGTATACGCG.
Two dimensional NMR methods have been used to assign proton resonances in the high salt (greater than or equal to 100mM Na+), low temperature duplex form of the self-complementary DNA dodecamer d(CGCGTATACGCG). At low salt (less than or equal to 10mM Na+) and higher temperature marked changes in the two-dimensional spectrum, and in the one-dimensional spectr
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18. Investigation of the Structure of Yeast tRNAPhe by Nuclear Magnetic Resonance: Paramagnetic Rare Earth Ion Probes of Structure
The binding of paramagnetic rare earth ions to yeast tRNAPhe shifts some resonances in the low-field nuclear magnetic resonance spectrum that have been assigned to ring nitrogen protons of specific Watson-Crick base pairs. The changes in the nuclear magnetic resonance spectrum as the tRNA is titrated with Eu3+ indicate that 4 (or 5) Eu3+ ions are tightly bou
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19. Coupled plasmon-waveguide resonators: a new spectroscopic tool for probing proteolipid film structure and properties.
A variant of surface plasmon resonance (SPR) spectroscopy has been developed that involves a coupling of plasmon resonances in a thin metal film and waveguide modes in a dielectric overcoating. This new technique is referred to as coupled plasmon-waveguide resonance (CPWR) spectroscopy. It combines a greatly enhanced sensitivity (due to increased electromagn
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20. Structural analysis of the (dA)10.2(dT)10 triple helix.
The existence of DNA triple helices in vitro has been known for some time. Recent evidence suggesting that DNA triplexes exist in vivo and showing their potential for chemotherapeutic applications has renewed interest in these triple-strand conformations. However, little structural information is currently known about these unusual nucleic acid forms. We hav
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21. Rapid protein fold determination using unassigned NMR data
Experimental structure determination by x-ray crystallography and NMR spectroscopy is slow and time-consuming compared with the rate at which new protein sequences are being identified. NMR spectroscopy has the advantage of rapidly providing the structurally relevant information in the form of unassigned chemical shifts (CSs), intensities of NOESY crosspeaks
National Academy of Sciences.
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22. Assignment of the 13C nuclear magnetic resonance spectrum of a short DNA-duplex with 1H-detected two-dimensional heteronuclear correlation spectroscopy.
Proton-detected 1H-13C heteronuclear correlated spectroscopy [( 1H,13C]-COSY) was used to establish relations between the carbon-13 and proton nuclear magnetic resonance chemical shifts in the hexadeoxynucleoside pentaphosphate d-(GCATGC)2. Using the previously established sequence-specific proton NMR assignments, sequence-specific assignments were thus obta
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23. Identification of Fluoropyrogallols as New Intermediates in Biotransformation of Monofluorophenols in Rhodococcus opacus 1cp
The transformation of monofluorophenols by whole cells of Rhodococcus opacus 1cp was investigated, with special emphasis on the nature of hydroxylated intermediates formed. Thin-layer chromatography, mass spectrum analysis, and 19F nuclear magnetic resonance demonstrated the formation of fluorocatechol and trihydroxyfluorobenzene derivatives from each of thr
American Society for Microbiology.
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24. NMR characterisation of a triple stranded complex formed by homo-purine and homo-pyrimidine DNA strands at 1:1 molar ratio and acidic pH.
Homo-purine (d-TGAGGAAAGAAGGT) and homo-pyrimidine (d-CTCCTTTCTTCC) oligomers have been designed such that they are complementary in parallel orientation. When mixed in a 1:1 molar ratio, the system adopts an antiparallel duplex at neutral pH with three mismatched base pairs. On lowering the pH below 5.5, a new complex is formed. The NMR results show the coe