(Table T1) Calcium carbonate content of sediments from ODP Leg 172 sites

Visual-domain diffuse reflectance data collected aboard the JOIDES Resolution with the Minolta spectrometer CM-2002 during Ocean Drilling Program Leg 172 have been used to estimate successfully the carbonate content of sediments. Calibration equations were developed for each site and for each lithostratigraphic unit (or subunit at Site 1063) using multiple linear regression on raw as well as pretreated reflectance spectra (i.e., first-order derivation and squaring of raw reflectance spectra) for a total of 4141 direct carbonate measurements. The root-mean-square errors of 4% to 7% are within the range of previous estimates using diffuse reflectance data and are acceptable for the general extensive range of carbonate contents (i.e., 0-70 wt%) that characterize sedimentation at Leg 172 sites.

Uranium, Thorium and Protactinium isotopes of ODP Site 172-1063

Ocean circulation may have undergone reductions and reinvigorations in the past closely tied to regional climate changes. Measurements of 231Pa/230Th ratios in a sediment core from the Bermuda Rise have been interpreted as evidence that the Atlantic Meridional Overturning Circulation (AMOC) was weakened or completely eliminated during a period of catastrophic iceberg discharges (Heinrich-Event 1, H1). Here we present new data from the Bermuda Rise that show further 231Pa/230Th peaks during Heinrich-2 (H2) and Heinrich-3 (H3). Additionally, a tight correlation between diatom abundances (biogenic silica) and 231Pa/230Th is discovered in this core. Our results redirect the interpretation of 231Pa/230Th from the Bermuda Rise as a proxy for ocean circulation towards a proxy that reacts highly sensitive to changes of particle composition and water mass properties.

High-resolution paleomagnetic investigation in the Iceland Basin

Based on discrete samples, we report new high-resolution records of the ~185 kyr Iceland Basin (IB) geomagnetic excursion from Ocean Drilling Project (ODP) Site 1063 on the Bermuda Rise (sedimentation rate 32 cm/kyr) and from ODP Site 983 in the far North Atlantic (sedimentation rate 18 cm/kyr). Two records from Holes 1063A and 1063B are very consistent, and provide the highest resolution of the detailed field behaviour during the IB excursion obtained so far. Inclination records from Holes 983B and 983C in the far North Atlantic are also very consistent, whereas declination anomalies deviate more notably. The pseudo-Thellier (PT) technique was applied along with more conventional palaeointensity proxies (NRM/ARM and NRM/kappa) to recover relative palaeointensity (RPI) estimates from Hole 1063A and Hole 983B. As expected, these proxies indicate that the field intensity generally dropped at both sites during the IB excursion, but also that the history of RPI from the two sites is different. VGPs from Site 1063 indicate that the field at this location experienced some stop-and-go behaviour between patches of intense vertical flux over North America and the tip of South America, areas which coincide fairly well with patches of preferred transitional VGP clustering from reversals and zones of high seismic velocity in the lower mantle. Changes in RPI at this location were generally gradual, possibly due to the proximity of these flux patches, and the first period of VGP-clustering over North America was accompanied by a conspicuous increase in RPI. VGPs from Site 983 track along a different path, and the associated RPI changes are very abrupt and completely synchronous with the onset and termination of the excursion. The differing VGP paths from Sites 1063 and 983 indicate that the global field structure during the IB excursion was not dominated by a single dipole.

Stable carbon isotope ratios of Cibicidoides wuellerstorfi of MIS 2 time slices

The interval of time represented by marine isotope stages 11 and 12 (~360-470 ka) contains what may be the most extreme glacial and interglacial climate conditions of the Late Pleistocene. It has been suggested that sea level rose by ~160 m at the termination of glacial stage 12. This is 30% greater than the sea level rise that followed the most recent glacial maximum. There have been few detailed studies of the unique conditions that existed during the stage 11-12 time period because of the lack of high-quality core material. This problem has been addressed by the collection of high deposition rate cores from sediment drifts in the western North Atlantic during Ocean Drilling Project Leg 172. Benthic foraminiferal d13C data from cores collected between ~4600 and 1800 m were used to reconstruct bathymetric gradients in deep and intermediate water properties for selected time slices during this glacial-interglacial cycle. During glacial stage 12, the deep western North Atlantic was filled by a water mass that was more nutrient-enriched than modern Antarctic Bottom Water. Above 2000 m, a more nutrient-depleted water mass existed during this glacial stage. Such an intermediate water mass has been described for more recent glacial periods and presumably forms in a more proximate region of the North Atlantic. Interglacial stage 11 water mass properties closely resemble those of the present-day western North Atlantic. A nutrient-depleted water mass (d13C of 0.75-1.0 per mil), similar to modern North Atlantic Deep Water existed between 3500 and 2000 m. This was underlain by a water mass with lower d13C values (<0.75 per mil) that probably was derived from a southern source. Using Leg 172 data, along with previously published results from the Atlantic and Pacific oceans, we estimate a mean global d13C change of 0.95 per mil from stage 12 to stage 11. This is twice the whole ocean ?13C change reported for the transition from the last glacial maximum to the Holocene.

Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM

The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today.

SRL 172 (killed Mycobacterium vaccae) in addition to standard chemotherapy improves quality of life without affecting survival, in patients with advanced non-small-cell lung cancer : phase III results

Background: This open-label, randomised phase III study was designed to further investigate the clinical activity and safety of SRL172 (killed Mycobacterium vaccae suspension) with chemotherapy in the treatment of non-small-cell lung cancer (NSCLC). Patients and methods: Patients were randomised to receive platinum-based chemotherapy, consisting of up to six cycles of MVP (mitomycin, vinblastine and cisplatin or carboplatin) with (210 patients) or without (209 patients) monthly SRL172. Results: There was no statistical difference between the two groups in overall survival (primary efficacy end point) over the course of the study (median overall survival of 223 days versus 225 days; P = 0.65). However, a higher proportion of patients were alive at the end of the 15-week treatment phase in the chemotherapy plus SRL172 group (90%), than in the chemotherapy alone group (83%) (P = 0.061). At the end of the treatment phase, the response rate was 37% in the combined group and 33% in the chemotherapy alone group. Patients in the chemotherapy alone group had greater deterioration in their Global Health Status score (-14.3) than patients in the chemotherapy plus SRL172 group (-6.6) (P = 0.02). Conclusion: In this non-placebo controlled trial, SRL172 when added to standard cancer chemotherapy significantly improved patient quality of life without affecting overall survival times. © 2004 European Society for Medical Oncology.

Sapientia, 1989, Vol. XLIV, nº 172 (número completo)

Contenido: Naturaleza del conocimiento humano : el significado de la abstracción en Santo Tomás (II) / Octavio Nicolás Derisi – Nacimiento, vida y transfiguración del filósofo griego / Cesáreo López Salgado – La transformación ockhamista de la teoría de la suposición / Ignacio Miralbell – La noción de lugar en Guillermo de Ockham / Olga L. Larre ; J. E. Bolzán – Notas y comentarios -- Bibliografía

Diário da Constituinte [gravação de vídeo] : [programa n. 172 A]

O chamado Grupo dos Trinta e Dois Constituintes revisou o projeto de Constituição, do Relator Bernardo Cabral (PMDB-AM), e reduziu o texto para duzentos e cinquenta artigos. O Deputado Israel Pinheiro (PMDB-MG) declara que o texto constitucional ficou mais organizado, mais articulado, após a revisão. Não houve preocupação em tocar nos pontos polêmicos do projeto, mas apenas de enxugar o texto original, deixando para a lei ordinária o que não é constitucional. O Senador Virgílio Távora (PDS-CE) considera que foi uma tentativa válida de auxílio. O Deputado Ulysses Guimarães (PMDB-SP), a quem foi entregue a nova versão, considerou que é uma contribuição importante, assim como outras tantas que chegarão. Balanço da primeira semana de entrega das emendas populares a Assembleia Nacional Constituinte (ANC). Representantes de empregados em empresas de telecomunicações de todo o país entregam emenda na qual pedem a manutenção do monopólio estatal nos serviços de telecomunicação e a criação do Conselho Nacional de Comunicação, que garanta a cada brasileiro o direito à informação livre e sem censura. Representantes das cooperativas entregam emenda na qual pedem a auto-gestão dos seus negócios, o ensino do cooperativismo e a isenção de impostos. Roberto Rodrigues, representante das cooperados, diz que quando a cooperativa vende algum insumo para o cooperado, cobrando dele um diferencial referente ao custo operacional da cooperativa, não pode haver incidência de imposto. O Deputado Ivo Vanderlinde (PMDB-SC) considera positivo o fortalecimento do cooperativismo. O Deputado Bernardo Cabral (PMDB-AM) mostra entusiasmo ao receber as emendas populares. Fernando Gabeira, jornalista e escritor, convoca o povo a participar.

Diário da Constituinte [gravação de vídeo] : [programa n. 172]

Parlamentares de todos os partidos procuram o consenso em torno do projeto de Constituição. O Deputado Israel Pinheiro Filho (PMDB-MG) esclarece que a preocupação é encontrar um texto constitucional que seja mais reduzido, mais enxuto, mas que represente a vontade da sociedade brasileira. Pacifistas denunciam a fabricação indiscriminada de armas nucleares, quarenta e dois anos após a Bomba de Hiroshima. O atual projeto de Constituição admite o uso da energia nuclear somente para fins pacíficos. O Deputado Fabio Feldmann (PMDB-SP) esclarece que muitas pessoas defendem a bomba atômica como um instrumento da paz, o que é um claro absurdo. Ele apoia a emenda popular proposta pela Sociedade Brasileira para o Progresso da Ciência (SBPC) que proíbe a bomba atômica brasileira. Sessão Extraordinária da Assembleia Nacional Constituinte (ANC) debateu a Reforma Agrária. O Deputado Roberto Jefferson (PTB-RJ) criticou a esquerda e considera que a distinção entre terras improdutivas e terras inexploradas deve ser feita pela justiça, pois a violência inviabilizará a Reforma Agrária. O Deputado Aldo Arantes (PC do B-GO) afirma que o atual projeto é a expressão da vontade dos latifundiários e propõe limite ao tamanho das propriedades rurais.

双奇核~(172)Re高自旋态实验研究

利用149Sm(27Al,4nγ)172Re反应布居了形变双奇核172Re的高自旋态,用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量,首次建立了172Re由3个转动带构成的高自旋态能级纲图.研究和讨论了3个转动带的结构特征,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11/2 νi13/2,πh9/2 νi13/2和 π1/2-[541] ν1/2-[521].发现前两个转动带在自旋小于18时其转动能级呈现反常的旋称劈裂.

双奇核~(172)Re高自旋态转动带结构实验研究

利用重离子熔合蒸发反应 14 9Sm (2 7Al,4nγ) 172 Re布居了形变双奇核 172 Re的高自旋态 ,用 12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量 ,首次建立了形变双奇核172 Re由 3个转动带构成的高自旋态能级纲图 .研究和讨论了 3个转动带的结构特征 ,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11 2 νi13 2 ,πh9 2 νi13 2 和π1 2 -[5 41] ν1 2 -[5 2 1].发现前两个转动带在自旋小于 18.5时其转动能级呈现反常的旋称劈裂 .