Browsing by Issue Date, starting with "1999-05"
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- Development of the pectoral, pelvic, dorsal and anal fins in cultured sea breamPublication . Faustino, M.; Power, DeborahThe pectoral fin girdle was the first element of the fins to develop in Sparus aurata. By 3·1mm LN (notochord length) the cleithrum was ossified and the cartilaginous caracoid–scapula was present. The fin was fully developed at 11·6 mm LS (standard length) and by 16·0 mm LS most elements of the fin were ossified. The pelvic fins were the last pair to develop and rudiments of these were first detected at 7·9 mm LS. The pelvic fin and girdle were completely formed and ossified at 16·0 mm LS. The development of dorsal and anal fins began at c. 6·5–7·0 mm LS with the formation of 10 cartilaginous dorsal proximal radials and eight cartilaginous ventral proximal radials. The three cartilaginous predorsals(supraneurals) appeared at 7·7 mm LS and the ossification of dorsal and anal proximal and distal radials began, respectively, at 10·5 mm LS and 11·3 mm LS. Ossified structures in the fins were also classified according to their origin, as being either dermal or endochondral. Finally the chronology of appearance of fin structures in S. aurata was compared with that reported for other Sparidae, Engraulidae and Haemulidae.
- Identification of transthyretin in fish (Sparus aurata) cDNA cloning and characterisationPublication . Santos, Cecilia; Power, DeborahTransthyretin (TTR) has been proposed to have first evolved in reptiles and is one of the three plasma proteins important in the transport of thyroid hormones in higher vertebrates.
- Spherical 2-categories and 4-manifold invariantsPublication . Mackaay, Marco
- Identification of transthyretin in fish (Sparus aurata): cDNA cloning and characterisationPublication . Santos, CRA; Power, DMTransthyretin (TTR) has been proposed to have first evolved in reptiles and is one of the three plasma proteins important in the transport of thyroid hormones in higher vertebrates. A full-length cDNA encoding TTR was isolated from a sea bream (Sparus aurata) liver cDNA library using a homologous TTR cDNA probe generated by RT-PCR. Comparison of the deduced amino acid sequence of sea bream TTR with other published sequences, revealed an overall identity of 47-54%, although the amino acids in the active binding site were almost 100% conserved. Distribution of TTR was studied in sea bream adult tissue by RT-PCR and was detected in liver, brain, pituitary, gills, kidney, intestine and testis although northern blot analysis only revealed TTR in the liver, suggesting that in sea bream, liver is the main source of this protein. TTR was also expressed in larvae from the first day post-hatch (48h post-fertilisation), Analysis of thyroxine (T-4) and triiodo-L-thyronine (T-3) binding to sea bream serum proteins demonstrated that both T-4 and T-3 bind to albumin and TTR. By demonstrating the existence of TTR in teleost fish this study indicates TTR must have evolved in a common fish ancestor of the tetrapod evolutionary line.
- High-performance computing for real-time spectral estimationPublication . Madeira, M. M.; Bellis, S. J.; Beltran, L. A. A.; Gonzalez, J. S.; Nocetti, D. F. G.; Marnane, W. P.; Tokhi, M. O.; Ruano, M. GraçaThis paper presents two separate investigations into the real-time implementation of the modified covariance spectral estimator: one comparing performances on digital signal processors, the TMS320C40, and the recently released ADSP2016x (SHARC); another using application-specific custom circuitry. The advantages and disadvantages of each of these different approaches are reviewed, resulting in the design of a field-programmable gate array/digital signal processor-based high-performance system that combines the hardware and software approaches. In conjunction with pulsed Doppler ultrasound blood-flow detectors, the spectral estimator offers increased sensitivity in the non-invasive detection of arterial disease. (C) 1999 Elsevier Science Ltd. All rights reserved.
- As atitudes dos empresários face a pessoas com deficiênciaPublication . Monteiro, Ileana Pardal; NETO, MARIAAs pessoas com deficiência de acordo com o Secretariado Nacional de Reabilitação (1996) apresentam um índice de desemprego de 51% e possuem um nível de habilitação mais baixo do que a população nacional. Estes números, que são preocupantes, podem por outro lado reflectir uma discriminação social em relação a estas pessoas. A nossa sociedade aparenta hoje uma maior tolerância e flexibilidade ao nível dos valores, não sendo “politicamente correcto” manifestar atitudes de rejeição face a grupos minoritários. Brown (1996) refere que, actualmente, as atitudes preconceituosas não se manifestam do mesmo modo que há alguns anos, contudo, ao nível latente, estas continuam a existir. A presente comunicação baseada num estudo empírico realizado, através de questionário, pretende reflectir sobra a atitude dos empresários de PME´S face a esta realidade. Pretendemos conhecer as atitudes dos empresários, de diferentes sexo, idade, nível habilitacional e de vários sectores de actividade, face à aceitação de pessoas deficientes. Os resultados diferenciam as atitudes dos empresários consoante este se refira à sua empresa ou às empresas dos outros. Verificámos, também, que a formação profissional faz a diferença, bem como o sector de actividade, o nível habilitacional e a idade.