998 resultados para 1ª Lei da Termodinâmica
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Inclui bibliografia.
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Bibliografia
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Oligonucleotides consisting of the isonucleoside repeating unit 2′,5′-anhydro-3′-deoxy-3′-(thymin-1-yl)-d-mannitol (4) were synthesized with the monomeric unit 4 incorporated into oligonucleotides as 1′→4′ linkage 4a (oligomer I) or 6′→4′ linkage 4b (oligomer II). The hybrid properties of the two oligonucleotides I and II with their complementary strands were investigated by thermal denaturation and CD spectra. Oligonucleotide I (4a) formed a stable duplex with d(A)14 with a slightly reduced Tm value of 36.6°C, relative to 38.2°C for the control duplex d(T)14/d(A)14, but oligomer II (4b) failed to hybridize with a DNA complementary single strand. The spectrum of the duplex oligomer I/d(A)14 showed a positive CD band at 217 nm and a negative CD band at 248 nm attributable to a B-like conformation. Molecular modeling showed that in the case of oligomer I the C6′ hydroxy group of each unit could be located in the groove area when hybridized to the DNA single strand, which might contribute additional hydrogen bonding to the stability of duplex formation.
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Discurso proferido por Sarney no programa Conversa ao pé do Rádio.
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Trata-se do caderno de formação de número 1, Introdução à Educação (bloco 1, módulo 1). Reúne as disciplinas 00 (Aula inaugural), 01 (Educação e Sociedade), Eixo Articulador Memória do Professor e 02 (Lei de Diretrizes e Bases - LDB).
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O processo de reforma da lei de direitos autorais brasileira (Lei 9.610/98) teve início em 2007, durante a gestão de Gilberto Gil no Ministério da Cultura, a partir do Fórum Nacional de Direito Autoral, do debate público e da consulta online do anteprojeto de modernização da lei. Desde então, o país presenciou movimentos de avanço e estagnação da reforma, esperando-se que com a nomeação de Juca Ferreira para o Ministério da Cultura em 2015, a reforma da lei entre novamente em pauta. Contudo, existem diversos desafios nesse percurso que serão brevemente analisados neste artigo.
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The chemical index of alteration (CIA) and elemental ratios that are sensitive to chemical weathering, such as Ca/Ti, Na/Ti, Al/Ti, Al/Na, Al/K, and La/Sm, were analyzed for detrital sediments at Ocean Drilling Program Site 1148 from the northern South China Sea to reveal information of chemical weathering in the source regions during the early Miocene. High CIA values of ~80, coupled with high Al/Ti and Al/Na and low Na/Ti and Ca/Ti, are observed for the sediments at ~23 Ma, indicating a high chemical weathering intensity in the north source region, i.e., south China. This was followed by gradual decreases in Al/Ti, Al/Na, La/Sm, and Al/K ratios, as well as the CIA values, and increases in Ca/Ti and Na/Ti ratios. These records together with other paleoclimate proxies, such as black carbon d13C and benthic foraminifer d18O, give reliable information on the climate changes in south China. Our results show that the climate in south China was warm and humid in the early Miocene (~23 Ma) according to the chemical weathering records. The humidity in south China decreased from the early Miocene to Present with several fluctuations centering at approximately 15.7 Ma, 8.4 Ma, and 2.5 Ma, coincident with the global cooling since the middle Miocene. These climate changes implied that the summer east Asian monsoon has dramatically affected south China in the early Miocene, whereas the influence of the summer monsoon on this region has decreased continuously since that time, probably because of the intensification of the winter monsoon. Such an evolution for the east Asian monsoon is different from that for the Indian monsoon.
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"He leído con detención el sumario que se instruye a mi defendido [sargento mayor Desiderio Sandes] por muerte del coronel Desiderio Arenas, sacando en consecuencia que el mayor Sandes ha sido víctima de una tentativa de homicidio."--p. [3]