Age estimates of Discoaster datums and corresponding isotope stages (Table 2)

High-resolution records (2 7 kyr) of Upper Pliocene Discoaster abundances obtained from six ODP/DSDP sites are assessed independently using oxygen isotope stratigraphy. Four Atlantic Ocean sites (DSDP Sites 552 and 607, and ODP Sites 659 and 662) comprise a transect from 56°N to 1°S and provide a record of latitudinal variations in Diseoaster biogeography. Low-latitude sites in the Atlantic (ODP Site 662), Pacific (ODP Site 677), and Indian (ODP Site 709) oceans provide additional information about variability in Discoaster abundance patterns within the equatorial region. A common chronology, based on the astronomical time scale developed for ODP Site 677, has been established for all the sites. By integrating oxygen isotope data and Discoaster abundance records at each site we are able to independently evaluate the temporal and spatial distribution of D. brouweri and D. triradiatus in the 500 kyr prior to the extinction of the discoasters near the base of the Olduvai subchron. Major decreases in abundance are evident during some of the more intense late Pliocene glacial events. In particular, glacial isotope stages 82, 96, 98 and 100 are associated with distinct abundance minima. At these times, large-scale changes in surface hydrographic conditions appear to have suppressed Discoaster numbers on a global scale. The increase in abundance of D. triradiatus, which precedes the extinction of the discoasters by around 200 kyr, may also be related to the intensification of environmental pressures that accompanied the build-up of Northern Hemisphere ice sheets during the late Pliocene. In spite of contrasting geographic and oceanographic settings, the various D. brouweri and D. triradiatus records are remarkably similar. This demonstrates that the acme and extinction events are excellent biostratigraphic datums. The simultaneous extinction of D. brouweri and D. triradiatus at 1.95 Ma were synchronous events at both a regional scale within the Atlantic, and on a global scale between the three major oceans. However, the start of the D. triradiatus acme appears to have been diachronous, occurring some 40 kyr earlier in the Atlantic than in the Indo-Pacific, and hence the stratigraphic usefulness of this datum is regional rather than global.

Oligocene to Miocene stable isotope record and planktonic foraminifer biostratigraphy of the Sierra Leone Rise

We have integrated Oligocene to lower upper Miocene planktonic foraminifer biostratigraphy with benthic foraminifer (Cibicidoides spp.) stable isotope records for two sites drilled on opposite sides of the Sierra Leone Rise in the eastern equatorial Atlantic Ocean. Deep Sea Drilling Project Site 366 (2853 m present water depth; 2200-2800 m paleodepth) recovered an Oligocene to upper Miocene record with a minor unconformity in the "middle" Oligocene and a condensed middle Miocene section. Ocean Drilling Program Site 667 (3529 m present depth; 3000-3500 m paleodepth) recovered an apparently continuous "middle" Oligocene to lower middle Miocene record and a similar condensed middle Miocene section. The Oligocene to lower Miocene sections were deposited at similar sedimentation rates (~11-16 m/m.y.). Stable isotope stratigraphy proved to be useful in establishing intra- and interbasinal correlations. In addition to the well-known earliest Oligocene and middle Miocene S180 increases, a distinct d18O increase occurred near the Oligocene/Miocene boundary. Carbon isotope variations provide similar potential for improving correlations; for example, a d13C increase occurred near the Oligocene/Miocene boundary in concert with increased d18O values. There was little d13C difference between the western Atlantic and eastern Atlantic basins during the late Oligocene and most of the middle Miocene; in contrast, eastern basin d13C values were slightly lower than those in the western basins during the earliest Oligocene (about 35-33 Ma) and early Miocene (about 22-18 Ma).

Calcareous nannofossil biostratigraphy of ODP Hole 108-667A and DSDP Site 85-574

Detailed quantitative analyses of selected calcareous nannofossil species were used to determine the placement of zonal boundaries. In Hole 667A in the equatorial Atlantic Ocean, Zones CP19 through CN5 were recognized, whereas at Site 574 in the equatorial Pacific Ocean, only the CN4/CN5 boundary could be determined. Boundaries were identified by sharp rises and declines in abundance at the beginnings and ends, respectively, of index fossil ranges. The sharp rise in abundance at the beginning of the range of Triquetrorhabdulus rugosus provided a good datum level in both regions; the same is true for the sharp decline in abundance at the end of the range of Cyclicargolithus floridanus. The last occurrence of Helicosphaera ampliaperta was used to mark the CN3/CN4 boundary in Hole 667A, while at Site 574, H. ampliaperta was absent. The abundance pattern of Triquetrorhabdulus carinatus obtained from Hole 667A makes it impossible to observe a distinct disappearance level. Age/depth plots reveal uniform sedimentation rates at both sites during early Miocene times. At Site 667 in the Atlantic the mean sedimentation rate was 14.90 m/m.y., and at Site 574 in the Pacific it was 16.17 m/m.y. during this same period. One new nannofossil species, Triquetrorhabdulus rioensis, is described; and one species, Triquetrorhabdulus serratus, is recombined.

Friedrich Bergammer (Fritz Glueckselig) standing in the doorway of the gallery store M. Glueckselig & Son; 108 East 57th Street, New York Portraits Men

Digital Image

Sapientia, 1973, Vol. XXVIII, nº 108 (número completo)

Contenido: Un hombre y un mundo sin sentido / Ocostavio N. Derisi – Existencia y cultura / Alberto Caturelli – La cuestión “De aeternitate mundi” : posiciones doctrinales / Omar Argerami – Educación y trascendencia / J. E. Bolzán – Notas y comentarios -- Bibliografía

Diário da Constituinte [gravação de vídeo] : [programa n. 108]

Os Constituintes consideram que é dever do Estado proteger as crianças. João de Deus Antunes (PDT-RS) diz que o menor vai ser um dos mais privilegiados na nova carta constitucional. Pontos fundamentais dos direitos da criança: direito à vida, à saúde, à alimentação e à educação; diireito à assistência social, mesmo que os pais não contribuam para a previdência; proteção aos menores carentes e infratores; legislação especial sobre o trabalho do menor. Wilma Maia (PDS-RN) afirma que a nova Constituição tem de fazer cumprir os princípios de proteção dos menores, a começar pela educação, baseada um uma nova concepção, que ensine as crianças seus direitos e seus deveres. Robson Marinho (PMDB-SP) considera que no texto da nova Constituição estão assegurados os direitos básicos da criança. Mário Covas (PMDB-SP) acompanha as reuniões da Comissão de Sistematização e acredita na compatibilização dos diferentes textos feitos pelas distintas correntes políticas na Assembleia Nacional Constituinte (ANC). Artur da Távola (PMDB-RJ) aprova a permanência dos pontos mantidos no substitutivo da Comissão de Comunicação, especialmente as quatro finalidades da comunicação: cultural, educativa, regionalização da produção cultural e divulgação da cultura nacional. Bernardo Cabral (PMDB-AM), Relator da Comissão de Sistematização, faz balanço dos trabalhos e dos prazos. Na sessão O Povo Pergunta, cidadão quer saber o que está sendo decidido quanto a doação de órgãos. Uldurico Pinto (PMDB-BA) responde que todo cidadão é um doador em potencial, salvo aqueles que a família não permitir. Bernardo Cabral; João de Deus Antunes; Wilma Maia; Robson Marinho; Mário Covas; Fernando Henrique Cardoso; Arthur da Távola; Ulsorico Pinto;

Benthic habitat mapping in the Olympic Coast National Marine Sanctuary: Classification of side scan sonar data from survey HMPR-108-2002-01: Version I

In September 2002, side scan sonar was used to image a portion of the sea floor in the northern OCNMS and was mosaiced at 1-meter pixel resolution using 100 kHz data collected at 300-meter range scale. Video from a remotely-operated vehicle (ROV), bathymetry data, sedimentary samples, and sonar mapping have been integrated to describe geological and biological aspects of habitat and polygon features have been created and attributed with a hierarchical deep-water marine benthic classification scheme (Greene et al. 1999). The data can be used with geographic information system (GIS) software for display, query, and analysis. Textural analysis of the sonar images provided a relatively automated method for delineating substrate into three broad classes representing soft, mixed sediment, and hard bottom. Microhabitat and presence of certain biologic attributes were also populated into the polygon features, but strictly limited to areas where video groundtruthing occurred. Further groundtruthing work in specific areas would improve confidence in the classified habitat map. (PDF contains 22 pages.)

Diário da Constituinte [gravação de vídeo] : [programa n. 667]

Empenho de constituintes no aperfeiçoamento da redação do texto da nova Carta Magna. Inexistência de quorum regimental para realização da sessão. Convocação dos constituintes pelo Presidente Ulysses Guimarães para comparecimento ao plenário.

Production of new superheavy Z=108-114 nuclei with U-238, Pu-244, and Cm-248,Cm-250 targets

Within the framework of the dinuclear system (DNS) model, production cross sections of new superheavy nuclei with charged numbers Z=108-114 are analyzed systematically. Possible combinations based on the actinide nuclides U-238, Pu-244, and Cm-248,Cm-250 with the optimal excitation energies and evaporation channels are pointed out to synthesize new isotopes that lie between the nuclides produced in the cold fusion reactions and the Ca-48-induced fusion reactions experimentally, which are feasible to be constructed experimentally. It is found that the production cross sections of superheavy nuclei decrease drastically with the charged numbers of compound nuclei. Larger mass asymmetries of the entrance channels enhance the cross sections in 2n-5n channels.