Several microemulsion microstructures were identified in the one-phase region of the sodium dodecyl sulfate/1-butanol/ toluene/2.5 wt % NaCl brine system by quasielastic light scattering, conductivity, viscosity, and steady-state fluorescence-probe measurements. At high ratios of water to oil, microemulsions are aqueous solutions of oil-swollen micelles; at low ratios of water to oil, microemulsions are oleic solutions of water-swollen inverted micelles; near the three-phase region, where the microemulsion takes up substantial amounts of both water and oil, the structure is a bicontinuous interpenetrating network of water and oil domains separated by surfactant layers. There is also a large excluded region for droplets where small hydrated surfactant aggregates solvated with alcohol molecules are dispersed in an oleic medium, and a small region, near the 2-phase boundary, where the structure is unknown.
RESUMENSe revisa la distribución de Cestrum mortonianum y se describe e ilustra una variedad de la Sierra de Manantlán. Se discuten las características que la diferencian de C. mortonianum var. mortonianum, C. tomentosum y C. pacificum, las cuales tienen en común la presencia de pubescencia ramificada. Se proporciona una clave para separar las especies de Cestrum de México con este tipo de indumento.Palabras clave: Cestrum, México, Sierra de Manantlán, Solanaceae.
ABSTRACTWe present a review of the geographic distribution of Cestrum mortonianum, as well as a description and an illustration of a new variety from the Sierra de Manantlan. The features that differentiate this variety from C. mortonianum var. mortonianum, and from C. tomentosum and C. pacificum -all of which share the presence of branched pubescence -are also discussed. A key to distinguish the Mexican species of Cestrum whith this indumenta is provided.
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