A Web a Três Dimensões

A utilização da Web para a divulgação de produtos e negócios através da Internet já não é novidade, novidade é a Web3D2, uma nova tecnologia concebido para lhe proporcionar inúmeros momentos de interactividade e dinamismo. Pretende-se assim fazer uma pequena abordagem dos objectos 3D na WWW, passando uma visão sobre a Web, identificando algumas as funcionalidades e serviços, a visualização de objecto 3D na Web, os navegadores comuns e os visualizadores que permitem visualizar conteúdos tanto 2D como 3D. Pretende-se desta forma partilhar e dar a conhecer os trabalhos e os avanços conseguidos na criação da das tecnologias Web3D, iniciando com uma contextualização da Web3D, fazendo uma passagem pelos mundos virtuais na Internet criados em Virtual Reality Modeling Language, realçando as dificuldades dessa linguagem na altura e os novos incentivos que deram origem a outras especificação como a X3D. Ainda são identificadas algumas plataformas e ferramentas de tecnologia Web3D, exemplos de algumas áreas onde se aplicam e a perspectiva para o futuro da Web3D centrada na visão do Web3D consortium.

Avistamientos de cetaceos en el mar peruano y su relación con los principales recursos pelágicos crucero BIC Humboldt 9803-05 de Tumbes a Tacna

Se efectuaron 214 avistamientos de cetáceos en 2019 mn observadas durante el Crucero de Evaluación Hidroacústica de Recursos Pelágicos BIC Humboldt 9803-05 de Tumbes a Tacna, desde el 20 de marzo al 07 de mayo de 1998. Se identificó un total de 10 especies entre odontocetos y misticetos: el bufeo Tursiops truncatus (24,3% del total de avistamientos), el delfín común Delphinus delhis (24,3%), el delfín oscuro Lagenorhyncgus obscurus (13,5%), una especie de delfín tropical Stenella sp. (0,5%), la ballena piloto Globicephala sp. (0,5%), el zifio de Cuvier Ziphius cavirostris (0,5%), el cachalote Physeter macrocephalus (2,3%), la ballena jorobada Megaptera novaeangliae (2,3%), la ballena azul Balaenoptera musculus (2,3%) y la ballena de aleta Balaenoptera physalus (0,9%). Los balaenoptéridos constituyeron el 18,46% de los avistamientos y el 3,5% del total de individuos avistados (256 individuos) presentando una distribución más densa en la zona sur. Del total de pequeños cetáceos avistados el 47,4% fueron identificados como delfines comunes, el 31,12% fueron bufeos y el 7,3% fueron delfines oscuros. Concentraciones importantes de cetáceos menores se presentaron frente a Salaverry, entre Huacho y Callao, al sur de Pisco y San Juan y entre Mollendo e Ilo.

Författarinnan Anu Kaipainen 6.6.1968 Grankulla

Kirje

Järjestettäväkö vai ei? / U. Kekkonen

Urho Kekkosen haast.

Investigaciones pesqueras en el mar desarrolladas durante 1962-1974

Muestra los cambios naturales de la población de organismos vivos, cuyo proceso evolutivo y características de agrupación plantean una problemática sui generis y por demás compleja, como el recurso de tipo estático.

Stocks assesment, biomass and fish production in two mediterranean basins (NE Spain)

In order to evaluate the success of the reintroduction of the Eurasian otter (Lutra lutra) in the Empordh wetlands (Parc Natural dels Aiguamolls de I'Empordhà), and the Muga and Fluvih basins, density of fish, biomass and production in the Muga and Fluvia Rivers have been estimated, since fishes represent the principal prey in the otter diet. 12 study sites were selected in order to survey the main flows in both basins. Electrofishing surveys were conducted by blocking off the station with barrier nets, which was performed upon 3 successive catches. The density estimated presents a range of 1,136-1 25 ind .ha' in the Muga basin, 4,49-163 ind.ha' in the Fluvih basin and 3,76-52,2 ind.ha' in the Empordh wetlands. Estimated biomass ranges are 0,616-277,6 g.m2, 8,79-351,2 g.m2, and 5,7-108 g.m-2 respectively. These density anfi biomass ranges are similar to other results obtained from rivers inhabited by the Eurasian otter in NE Spain

Informe estadístico de los recursos hidrobiológicos de la pesca artesanal marina por especies, artes, meses y lugares de desembarque durante el segundo semestre del 2000

Estudia la muestra de la lista de especies desembarcadas por la pesquería artesanal, número de días muestreados, el consolidado de la flota artesanal por lugares de desembarque, el consolidado del estimado mensual de los desembarques de recursos hidrobiológicos por especies, el estimado de los desembarques de especies referido a lugares, el estimado de las desembarques de especies referido a artes y métodos de pesca; t el consolidado del estimado de los desembarques mensuales de especies por lugares referido a artes y método de pesca.

Kansanedustaja Veikko Svinhufvud 29/4 1963

Kirje 29.4.1963

[80 phot. des îles Shetland, Orcades, Skye, Bute et autres îles du nord-ouest de l'Ecosse, par G.W. Wilson, don E. Saisset en 1886]

Donateur : Saisset, E. (18..-18..?)

1st radiometric dating of a paleontologically dated Bathonian level from Georgia (USSR) - Use of the cathodoluminescence for selection of suitable plagioclases

Jurassic volcanic formations interlayered with (ammonite-bearing) sediments are common in the Caucasus area; this situation is of interest for the numerical calibration of the poorly documented Jurassic portion of the time scale. However, following petrographic study on thin sections no whole-rocks can be considered reliable geochronometers due to subsequent alteration; from about 20 samples, two were selected for plagioclase dating; one (V134) is probably early Kimmeridgian in age; the other (V136) is probably located in the Lower Bathonian stage according to diagnostic ammonites. Cathodoluminescence (CTL) study has shown that sample V136 was similar to usual volcanic feldspars (blue to green colour); however, the lack of CTL of the V134 plagioclase is a character common to diagenetic feldspars; consequently, in spite of a good optical preservation, this geo-chronometer cannot give an age representative of the time of emplacement of the lava flow. We have combined CTL observation with microprobe analysis in order to document the poorly known CTL behaviour of volcanic feldspars; cations Ti4+ and Fe2+ play a major role in the CTL colour of plagioclases and are able to document the growing history of these feldspars ; phenocrysts are initially rich in Fe2+ (core of the crystals, green in colour), then richer in Ti toward the exterior; microcrysts are even richer in Ti (blue to bright blue). We have also observed that natural CTL colour was modified resulting from acid ``cleaning'' of the separated feldspars : the initial blue or green colour tends to change to yellow or violet, respectively, after acid treatment probably due to oxydation of Fe2+ toward Fe3+. X-ray and microprobe analyses both indicated that plagioclases from sample V134 was near the sodic end member (albite) suggesting a diagenetic origin in this andesitic basalt; In contrast, sample V136 contains a calcic plagioclase of common composition for a doleritic basalt. The K-Ar conventional technique was applied as a preliminary tool for radiometric analysis. The Kimmeridgian Na-plagioclase sample gave a ``rejuvenated'' (85 Ma) apparent age which confirms a late genesis for the separated plagioclase phase; this interpretation is based on CTL observation, X-ray analysis, and microprobe analysis ; these techniques are able to distinguish samples which have been submitted to diagenetic alteration from those which have not. An age consistent with the stratigraphic location has been obtained from sample V136. This age of 161 +/- 3 (2-sigma) Ma, is the first one available from a sample palaeontologically located with reasonable precision within the mid Jurassic time.

18F-FLT and 125I-IdUrd uptake increase in human tumour cell lines induced by the thymidylate synthase inhibitor FdUrd.

Aim: 5-fluoro-2'-deoxyuridine (FdUrd) depletes the endogenous 5'-deoxythymidine triphosphate (dTTP) pool. We hypothesized whether uptake of exogenous dThd analogues could be favoured through a feedback enhanced salvage pathway and studied the FdUrd effect on cellular uptake of 3'-deoxy-3'-18F-fluorothymidine (18F-FLT) and 5-125I-iodo-2'-deoxyuridine (125I-IdUrd) in different cancer cell lines in parallel. Methods: Cell uptake of 18F-FLT and 125I-IdUrd was studied in 2 human breast, 2 colon cancer and 2 glioblastoma lines. Cells were incubated with/without 1 µmol/l FdUrd for 1 h and, after washing, with 1.2 MBq 18F-FLT or 125I-IdUrd for 0.3 to 2 h. Cell bound 18F-FLT and 125I-IdUrd was counted and expressed in % incubated activity (%IA). Kinetics of 18F-FLT cell uptake and release were studied with/without FdUrd modulation. 2'-3H-methyl-fluorothymidine (2'-3H-FLT) uptake with/without FdUrd pretreatment was tested on U87 spheroids and monolayer cells. Results: Basal uptake at 2 h of 18F-FLT and 125I-IdUrd was in the range of 0.8-1.0 and 0.4-0.6 Bq/cell, respectively. FdUrd pretreatment enhanced 18F-FLT and 125I-IdUrd uptake 1.2-2.1 and 1.7-4.4 fold, respectively, while co-incubation with excess thymidine abrogated all 18F-FLT uptake. FdUrd enhanced 18F-FLT cellular inflow in 2 breast cancer lines by factors of 1.8 and 1.6, respectively, while outflow persisted at a slightly lower rate. 2'-3H-FLT basal uptake was very low while uptake increase after FdUrd was similar in U87 monolayer cells and spheroids. Conclusions: Basal uptake of 18F-FLT was frequently higher than that of 125I-IdUrd but FdUrd induced uptake enhancement was stronger for 125I-IdUrd in five of six cell lines. 18F-FLT outflow from cells might be an explanation for the observed difference with 125I-IdUrd.