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Fluorescein-di-beta-D-galactopyranoside (FDG) was found to be a useful substrate for beta-galactosidase detection by flow cytometry in gram-negative bacteria, since it entered viable cells and gave a(More)
A new liposome system containing spermidine-condensed DNA and negative cone-forming lipids designed to improve gene delivery and expression is described. The compacted nature of condensed DNA forms(More)
Hemicycla laurijona sp. nov. and H. fulgida sp. nov. are described from the laurel forests of La Gomera and Tenerife islands, respectively (Canary Islands). Both species belong to the Helicinae group(More)
Some properties of DNA condensed with spermidine have been compared with the properties of DNA condensed with Co3+(NH3)6 to determine whether condensation of DNA with these trivalent cations protects(More)