Espectros eletrônicos de alguns complexos de geometria octaédrica de Ni2+: uma introdução prática à teoria do campo cristalino no curso de graduação

The experiment introduces the undergraduate students to the crystal field theory. The electronic spectra of the octahedral complexes of [Ni(L)n]2+ (L = H2O, dmso, NH3 and en) obtained in the experiment are used to calculate 10Dq and B parameters. The experiment shows how the parameters can be calculated and correlated with the nature of the ligands and the field intensities produced.

Uso de diagrama V modificado como relatório em aulas teórico-práticas de química geral

In this article, we present data from a study in practical classes for General Chemistry. To this end, it was proposed to use a modified V diagram to replace traditional reporting. These reports consist of material commonly prepared in the subject, including introduction, materials and methods, results and discussion and conclusions. From the preparation of the modified V, the students were able to establish relationships between the theoretical and methodological aspects necessary for understanding the objects and events studied. Thus, student learning can be evaluated in light of the Theory of Meaningful Learning.

CASOS INVESTIGATIVOS E A RELAÇÃO COM O SABER: TRAJETÓRIA E PROCESSO DE APRENDIZAGEM DE ESTUDANTES DO ENSINO SUPERIOR NO TOCANTINS

In light of the theory of relationship with know of Bernard Charlot, aiming to understand the unique stories of the subject through a positive lecture, i.e., understanding the reality and the way the subjects read and interpret the world, this article attempts identify how higher education students solve an investigative case and learn the scientific knowledge using this theory. For this, we used narrative as a discourse genre to collect the data of 34 students who participated in the small group activities. After content analysis, the results showed that all groups of students solve the case in a similar way and in three stages, prevailing relations with know with the world, with others and with yourself. However, even if the resolution is similar, chemical learning differs between different groups and differs between the scientific content present in the case. From these results it is possible to identify the effectiveness of learning depends on the epistemic and identity relationships with know of each subject (relationship with yourself) because to learn the student must enter into an intellectual activity (investigative case), stay on it and develop the relationships with known necessary to master the normativity (chemical language).

Towards a Unified Theory of Health-Disease: I. Health as a complex model-object

Theory building is one of the most crucial challenges faced by basic, clinical and population research, which form the scientific foundations of health practices in contemporary societies. The objective of the study is to propose a Unified Theory of Health-Disease as a conceptual tool for modeling health-disease-care in the light of complexity approaches. With this aim, the epistemological basis of theoretical work in the health field and concepts related to complexity theory as concerned to health problems are discussed. Secondly, the concepts of model-object, multi-planes of occurrence, modes of health and disease-illness-sickness complex are introduced and integrated into a unified theoretical framework. Finally, in the light of recent epistemological developments, the concept of Health-Disease-Care Integrals is updated as a complex reference object fit for modeling health-related processes and phenomena.

Synecological comparisons sustained by ecophysiological fingerprinting of intrinsic photosynthetic capacity of plants as assessed by measurements of light response curves

In some literature variations in photosynthetic rates are considered to be of little relevance for individual fitness. This depends among other things on how one defines fitness, i.e. if one takes strictly Darwinian fitness as seed production or if one needs to evaluate particular traits and consider plant establishment. It also matters if one takes the Darwinian "organism individual" as the central entity in evolution ("individual fitness") or the "species individual" in a modified "Structure of Evolutionary Theory" sensu Stephen Jay Gould. A phenotypically expressed trait like photosynthetic rate, even if intra- and interspecific differences may be small, can matter in habitat performance and niche acquisition. Light dependence curves (LCs) of photosynthetic rates are now readily measured under field conditions using miniaturized equipment of pulse amplitude modulated fluorometers. In contrast to actual momentary measurements of quantum yield of photosynthesis under actually prevailing ambient conditions, LC measurements reflect the expressed intrinsic capacity of photosynthesis. In this review we explore the power of LC measurements yielding cardinal points such as maximum apparent electron transport rate of photosystem II (ETRmax) and saturating photosynthetically active radiation (PARsat) in making intra- and interspecific comparisons of plant performance and synecological fingerprinting in ecophysiological studies across species, sites, habitats and ecosystems.

Price movement in the Brazilian land market (1994-2010): an analysis in the light of post-Keynesian theory

ABSTRACT The present study aims to evaluate crop, pasture and forest land prices in Brazil, between 1994 and 2010, in the light of Post-Keynesian theory. The results provide evidence that land, more than just a simple factor of production, must be conceived of as an economic asset. In fact, the price of rural land is determined not only by the expected profitability deriving from agricultural activities but also by the agents' expectations about its future appreciation and liquidity in an economic environment permeated with uncertainty. In this context, as an object of speculation, land has been particularly important as a store of value.