The bioassay-guided fractionation of stems from Kielmeyera variabilis, traditionally used in Brazilian folk medicine, yielded assiguxanthone-B (1), kielcorin (4), 2,5-dihydroxybenzoic acid (3), and a mixture of xanthones containing assiguxanthone-B (1) and 1,3,5,6-tetrahydroxy-2-prenylxanthone (2) (1:1 w/w). The xanthone mixture inhibited Staphylococcus aureus and Bacillus subtilis at a concent...

Sir, Erythrokeratodermia variabilis (EKV) is a rare autosomal dominant genodermatosis which is characterized by the coexistence of hyperkeratotic plaques and transient erythematous patches. Irregular, variably shaped erythematous macular patches may enlarge or regress over time. Concurrently, there are persistent, well-demarcated, geographic, hyperkeratotic plaques which are distributed on the ...

Transport of the ammonium analogue [(14)C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH(4)(+) inhibited uptake into the cells and released accumulated methylammonium from the cells. These observations suggest that the main function of ammonium transport in heteroc...

AIMS The objective of this study is to develop kinetic models based on batch experiments describing the growth, CO(2) consumption, and H(2) production of Anabaena variabilis ATCC 29413-U(TM) as functions of irradiance and CO(2) concentration. METHODS AND RESULTS A parametric experimental study is performed for irradiances from 1120 to 16100 lux and for initial CO(2) mole fractions from 0.03 t...

Mirian Fabiola Studart Gurgel Mendes, Dirceu de Campos Valladares Neto, Rosângela Aparecida de Azevedo, Paulo Caramelli I Hospital Madre Teresa, Belo Horizonte/MG, Brazil. II Fundação Nacional do Sono/Clı́nica do Sono, Nova Lima/MG, Brazil. III Secretaria de Estado da Saúde, Sistema de Informações de Efeitos Adversos pós-vacinais, Coordenação de Imunizações, Belo Horizonte/MG, Brazil. IV Faculda...

The paper presents an implementation of EKV MOST model in Matlab environment. Parameter extraction and fitting procedures are briefly sketched.Open source modules for transistor characteristics and additional functions for parameter extraction and fitting are included in a Matlab toolbox. Model parameters are user defined to provide flexibility of design process.The accuracy of simulation resul...