|
|
|
|
|
| Silvestre,Daniel Moreto; Kolb,Rosana Marta; Frei,Fernando; Santos,Catarina dos. |
| We evaluated the phytotoxic effects that the hexane, ethyl acetate and methanol extracts from leaves and branches of the species Turnera ulmifolia L. and Turnera diffusa Willd. ex Schult. (Turneraceae), at concentrations of 1.25, 2.50, 3.75 and 5.00 mg ml-1, have on seed germination and seedling development in cucumber (Cucumis sativus L.). None of the extracts tested prevented germination, although the ethyl acetate extracts of T. diffusa, at 3.75 and 5.00 mg ml-1, reduced the mean germination speed and time to germination. Hexane extracts of both species reduced the main root length, number of secondary roots and hypocotyl length. In the ethyl acetate and methanol extracts, the number of secondary roots and hypocotyl length varied by species and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Cucumis sativus; Germination; Development. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300003 |
| |
|
|
| Oliva Neto,Pedro de; Lima,Fabíola Aliaga de; Silva,Ketrin Cristina da; Silva,Douglas Fernandes da; Carvalho,Ana Flavia Azevedo; Santos,Catarina dos. |
| The purpose of this study was to determine the Minimum Inhibitory Concentration (MIC) of pure or mixed chemicals for Saccharomyces cerevisiae and Lactobacillus fermentum in the samples isolated from distilleries with serious bacterial contamination problems. The biocides, which showed the best results were: 3,4,4' trichlorocarbanilide (TCC), tested at pH 4.0 (MIC = 3.12 mg/l), TCC with benzethonium chloride (CBe) at pH 6.0 (MIC = 3.12 mg/l) and TCC mixed with benzalkonium chloride (CBa) at pH 6.0 (MIC = 1.53 mg /l). If CBa was used in sugar cane milling in 1:1 ratio with TCC, a 8 times reduction of CBa was possible. This formulation also should be tested in fermentation steps since it was more difficult for the bacterium to develop resistance to biocide.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ethanol; Lactic acid bacteria; Saccharomyces cerevisiae; Lactobacillus fermentum. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000300019 |
| |
|
|
|
