Potential respiration is a better respiratory predictor than biomass in young Artemia salina

[EN] These experiments test whether respiration can be predicted better from biomass or from potential respiration, a measurement of the mitochondrial and microsomal respiratory electron transport systems. For nearly a century Kleiber's law or a similar precursor have argued the importance of biomass in predicting respiration. In the last decade, a version of the Metabolic Theory of Ecology has elaborated on Kleiber's Law adding emphasis to the importance of biomass in predicting respiration. We argue that Kleiber's law works because biomass packages mitochondria and microsomal electron transport complexes. On a scale of five orders of magnitude we have shown previously that potential respiration predicts respiration aswell as biomass inmarine zooplankton. Here, using cultures of the branchiopod, Artemia salina and on a scale of less than 2 orders of magnitude,we investigated the power of biomass and potential respiration in predicting respiration.We measured biomass, respiration and potential respiration in Artemia grown in different ways and found that potential respiration (Ф) could predict respiration (R), both in μlO2h−1 (R=0.924Φ+0.062, r2=0.976), but biomass (as mg dry mass) could not (R=27.02DM+8.857, r2=0.128). Furthermore the R/Ф ratio appeared independent of age and differences in the food source.

Os Jesuítas nas Américas: "A República dos Guaranis"

[POR] Para este trabalho, elegemos um estudo sobre uma «experiência jesuíta» junto dos Guaranis, que designamos por «A República dos Guaranis». Trata-se de um processo histórico complexo que teve início no século XVII, sob o impacto da Contra-Reforma, e que terminou em pleno século XVIII, quando o Absolutismo, o Racionalismo e a Lei Natural dominavam a Europa. Este trabalho procura compreender como esta realidade sociocultural se relacionou com uma das regiões do Brasil colonial. [EN] This study analyzes a «Jesuit experience» with the Guarani people, also known as the «Guarani’s Republic». The latter is a complex historical venture which began in the 17th century, in the wake of the Counter-Reformation (1545-1648), and ended in the 18th century when Absolutism, Rationalism, and Natural Law dominated Europe. Our aim is thus that of analyzing how this socio-cultural reality was tied with one region of Colonial Brazil (1500-1822).