L'Aprenentatge virtual com a una nova forma d'ensenyar i d'aprendre a través de les tecnologies de la informació i la comunicació

Els avenços tecnològics de les àrees de la informació i la comunicació estan propiciant un canvi cultural important que repercuteix directament en el món de l'aprenentatge i de l¿ensenyament. L'aprenentatge instrumental d'aquestes tecnologies de la informació i la comunicació (TIC) a priori i l'aprenentatge a través d'aquestes tecnologies amb la finalitat d'accedir a un major coneixement ha provocat que el procés d'ensenyament i aprenentatge s'estengui al llarg de la vida («Life long learning») de qualsevol persona que, per la seva professió, necessiti actualitzar els seus coneixements. Per això, com es podrà apreciar en el present article, les noves línies d'investigació s¿orienten envers dos tipus d'estudi: optimitzar el disseny dels sistemes d'e-learning i analitzar els aspectes diferencials dels e-learners. A més, en l¿article, se¿ns dóna a conèixer com s'està desenvolupant el camp de l'aprenentatge virtual en aquest moment, en particular en l'àmbit de les universitats europees.

Planilha de validação: uma nova ferramenta para estimar figuras de mérito na validação de métodos analíticos univariados

This work presents the VALIDATION SPREADSHEET, a public domain tool that can be used to evaluate the figures of merit for univariate analytical methods. A real example of BTEX determination in environmental samples is included to illustrate its use. The spreadsheet has been developed for Excel® and Open Office®, and is available on the internet at http//lqta.iqm.unicamp.br.

2-fenilbenzotriazóis (PBTA): uma nova classe de contaminantes ambientais

This work is a literature review of PBTAs, the phenylbenzotriazoles generated from the reduction and chlorination of azo dyes. The PBTAs and the non- chlorinated PBTAs were isolated for the first time from river blue rayon organic extracts that showed high mutagenic activity in the Salmonella/microsome genotoxicity assay. To date, 8 PBTAs have been identified and beside their mutagenic activity in bacteria they cause genotoxic effects in fish and mammalian cell cultures. Due to the large number of textile dyeing facilities in Brazil, studies to determine them in the aquatic environment seem to be relevant.

Avaliação da pós-graduação da área de química na CAPES e a internacionalização das revistas da Sociedade Brasileira de Química: Journal of the Brazilian Chemical Society e Química Nova

This paper discusses of the use of the Impact Factor in the evaluation of chemistry graduate courses by CAPES and the internationalization of the Journal of the Brazilian Chemical Society and Química Nova.

De nova facie orbis Europaei circa saeculum reformationis exorta

Invocatio: Q.F.S.F.Q.

Determinação potenciométrica da concentração micelar crítica de surfactantes: uma nova aplicação metodológica no ensino de Química

The participation of the students in the planning, execution and discussion of experimental results is important for the valuation of the role of them in the construction of the chemical knowledge implicited in the approach between education and research. This work relates either the construction of selective membrane electrodes for surfactants and its application in the potenciometric determination of the critical micellar concentration of the sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (DTAB) surfactants. In adition it´s possible to discuss the potenciometric results in matching with the data valued for the tensiometric and condutimetric traditionally used in the physical-chemistry lessons.

Biodegradação de fenol por uma nova linhagem de A spergillus sp. isolada de um solo contaminado do sul do Brasil

The main goal of this work was to study the biodegradation of phenol in batch mode by a filamentous fungus isolated from a contaminated site in Southern Brazil. A better performance was obtained by previous adaptation of the microorganism to the toxic chemical. A 2³ experimental design was proposed and it could be observed total phenol degradation in 72 h using 500 mg L-1 glucose, inoculum of 20% and agitation of 200 rpm, resulting a biodegradation rate of 3.76 mg L-1 h-1. In relation to phenol tolerance, Aspergillus sp. LEBM2 was able to consume up to 989 ± 15 mg L-1.

Nova experimenta naturam pargasitae illustrantia

Arkit: 1 arkintunnukseton lehti, A4 B2.

De nova facie orbis Europaei circa saeculum reformationis exorta

Invocatio: Q.F.S.F.Q.

Nova experimenta naturam pargasitae illustrantia

Piirrosliite: J[ohannes] v. B[ecke]r sc.

De nova facie orbis Europaei circa saeculum reformationis exorta

Invocatio: Q.F.S.F.Q.

Receptores A3 da adenosina: uma nova abordagem terapêutica no câncer

Cancer is a multi-factorial disease linked with different initiating causes, cofactors and promoters, and several types of cellular damage. Advancing knowledge on the cellular and molecular biology of the processes that regulate cell proliferation, cell differentiation and cellular responses to external signals, has provided a wealth of information about the cancer cell and how it differs from a normal one. These findings make available a number of potential targets for new therapeutic approaches. The Medicinal Chemistry artwork performed so far in the development of selective and potent adenosine receptor A3 ligands, a current cancer target, will be highlighted in this work.

Redes de colaboração científica na área de química no Brasil: um estudo baseado nas coautorias dos artigos da revista Química Nova

In this paper we built three co-authorship networks displaying the acquaintances between countries, universities and authors that have published papers in Quimica Nova from 1995 to 2008. Our research was conducted applying a bibliometric approach to 1782 papers and over 4200 authors. Centrality measures were used and the most significant actors of each network were pointed out. The results using the centrality metrics and the network structures indicated that Quimica Nova resembles a typical scientific community.