A multi-screening approach for marine-derived fungal metabolites and the isolation of cyclodepsipeptides from Beauveria felina

Extracts obtained from 57 marine-derived fungal strains were analyzed by HPLC-PDA, TLC and ¹H NMR. The analyses showed that the growth conditions affected the chemical profile of crude extracts. Furthermore, the majority of fungal strains which produced either bioactive of chemically distinctive crude extracts have been isolated from sediments or marine algae. The chemical investigation of the antimycobacterial and cytotoxic crude extract obtained from two strains of the fungus Beauveria felina have yielded cyclodepsipeptides related to destruxins. The present approach constitutes a valuable tool for the selection of fungal strains that produce chemically interesting or biologically active secondary metabolites.

De vita et meritis Petri Brahe

Arkit: 1 arkintunnukseton lehti, A-B4.

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.

Vita & merita m. Isaaci B. Rothovii

Painovuosi nimekkeestä.

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.

De vita patriarcharum longissima

Arkit: 1 arkintunnukseton lehti, C-D4.

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.

Vita & merita m. Isaaci B. Rothovii

Arkit: 1 arkintunnukseton lehti, 2B-2C4.

Vita & merita m. Isaaci B. Rothovii

Arkit: 2 arkintunnuksetonta lehteä, T-U4.

Vita & merita illustrissimi herois &c. &c. Ded.:ni Thorstani Ståhlhandske

Invocatio: I.N.J.C.

Vita & merita m. Isaaci B. Rothovii

Arkit: 1 arkintunnukseton lehti, Z-2A4.

De nova facie orbis Europaei circa saeculum reformationis exorta

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