Age models and foraminifer isotopes of four ODP Leg 202 sites

We present benthic isotope stratigraphies for Sites 1236, 1237, 1239, and 1241 that span the late Miocene-Pliocene time interval from 6 to 2.4 Ma. Orbitally tuned timescales were generated for Sites 1237 and 1241 by correlating the high-frequency variations in gamma ray attenuation density, percent sand of the carbonate fraction, and benthic d13C to variations in Earth's orbital parameters. The astronomical timescales for Sites 1237 and 1241 are in agreement with the one from Atlantic Site 925/926 (Ocean Drilling Program Leg 154). The comparison of benthic d18O and d13C records from the east Pacific sites and Atlantic Site 925/926 revealed a surprising clarity of the "41-k.y. signal" in d13C records and a remarkably good correlation between their d13C records. This suggests that the late Miocene-Pliocene amplitudes of obliquity-related d13C cycles reflect a magnitude of global response often larger than that provided by obliquity-related d18O cycles. At Site 1237, the orbitally derived ages of Pliocene magnetic reversal boundaries between the base of Réunion and the top of Thvera confirm astronomical datings of the generally accepted ATNTS2004 timescale, except for the top of Kaena and the base of Sidufjall. Our astronomical age for the top of Kaena is about one obliquity cycle older. The base of Sidufjall appears to be about one precession cycle younger. The age models of Sites 1236 and 1239 were established by correlating their benthic d18O and d13C records directly to the orbitally tuned isotope record of Site 1241.

Diário da Constituinte [gravação de vídeo] : [programa n. 202]

Deputados progressistas da Assembleia Nacional Constituinte (ANC) se unem para apresentar emendas. Divididos em vinte e nove grupos, avaliam o substitutivo do Relator Bernardo Cabral (PMDB-AM). O Deputado Plínio Arruda Sampaio (PT-SP) considera que, se formarem uma base sólida, os progressistas terão melhores condições de negociar com os outros grupos. O Deputado Vivaldo Barbosa (PDT-RJ) informa dos pontos de consenso do grupo. Na Sessão para discussão de emendas populares, o debate dos direitos dos trabalhadores teve com ponto polêmico a estabilidade no emprego. Luiz Carlos Mandelli, representando o movimento pela livre iniciativa, critica a emenda que dá estabilidade ao empregado. O Deputado Mário Lima (PMDB-BA) afirma que os empresários estão cometendo um equívoco muito grande, pois o trabalhador quando tem estabilidade no emprego produz mais e melhor. Outra emenda popular propõe que o serviço de transporte coletivo seja estatizado. Ela foi defendida por João Bosco, Presidente da CONAN (Confederação Nacional das Associações de Moradores), que considera que cabe às prefeituras a gestão, planejamento e operacionalização do transporte coletivo. A CONAN ainda reivindica 25% do orçamento nacional para a construção de casas populares. Dalva Stella Medeiros (Vice-presidente da CONAN) defende que o poder público deve assumir o direito à moradia popular para todos os cidadãos. Na sessão O Povo Pergunta, cidadã gostaria de saber se os constituintes estão pensando em fazer uma Constituição voltada para pequenos interesses ou para os interesses da grande maioria da população. O Deputado Assis Canuto (PFL-RO) responde que há uma tendência de particularizar a Constituição brasileira, mas cabe a sociedade e aos constituintes fazerem uma Constituição para todos os brasileiros.

Generation time and utilization of energy by aquatic bacteria. [Translation from: Trudy Instituta Biologii Vnutrennykh Vodnany 11(14), 198-202, 1966.]

Recent research has shown that the biomass of bacteria in lakes and other water-bodies can attain significant values. The huge production of bacteria is brought about by their great rate of reproduction. In a series of cases their biomass exceeds the biomass of phytoplankton. Therefore in a study of the biological productivity of water bodies it is necessary to calculate the biomass and production not only of the phyto- and zooplankton, but also of bacteria.The authors uses different methods and formulae to to compare the time of one generation of the bacteria.

On a method of determination of chlorophyll in cells of algae collected on a membrane filter. [Translation from: Trudy Instituta Biologii Vnutrennykh Vodnany 11(14), 198-202, 1966.]

The original method, proposed by Yentsch (1957), of determination of chlorophyll directly in the cells, attracts attention by its simplicity. In order to measure the content of chlorophyll by this method, a determined volume of suspension of algae is filtered through a membrane filter. The latter is dried a little, clarified by immersion oil, clamped between two glasses, and spectrophotometrized. Extinction is read off at , wavelengths equal to 670 millimicrons (around the maximum absorption of chlorophyll a in the cell) and 750 millimicrons (correction for non- specific absorption and dispersion of light by particles of the preparation). The method of Yentsch was employed by the authors for determination of chlorophyll-a in samples of phytoplankton. They conclude that in spite of the simplicity and convenience of determination the method must be applied sufficiently carefully. It is more suitable for analysis of cultures of algae, where, non-specific absorption of light is insignificant.