Liposomes containing magnetic nanoparticles (magnetoliposomes) have been extensively explored for targeted drug delivery. However, the magnetic effect of nanoparticles movement is also an attractive choice for the conduction of signals in communication systems at the nanoscale level because of the simple manipulation and efficient control. Here, we propose a model for the transmission of electrical and luminous signals taking advantage of magnetophoresis. The study involved three steps. Firstly, magnetite was synthesized and incorporated into fusogenic large unilamellar vesicles (LUVs) previously associated with a fluorescent label. Secondly, the fluorescent magnetite-containing LUVs delivered their contents to the giant unilamellar vesicles (GUVs), which were corroborated by magnetophoresis and fluorescence microscopy. In the third step, magnetophoresis of magnetic vesicles was used for the conduction of the luminous signal from a capillary to an optical fibre connected to a fluorescence detector. Also, the magnetophoresis effects on subsequent transmission of the electrochemical signal were demonstrated using magnetite associated with CTAB micelles modified with ferrocene. We glimpse that these magnetic supramolecular systems can be applied in micro- and nanoscale communication systems.
The Condominium of Rural Employers is a model of contracting, and collective management regulated in Brazil in 1999, in order to ensure to rural workers, labor rights and security. The Department of Labor encouraged this model as an alternative to fraudulent cooperatives work. In São Paulo this system of collective registry was well accepted and considered an advance in the "modernization" of labor relations. The union of farmers for the purpose of hiring employees is classified as contract employee staff retreat, called the Rural Pact of Sao Paulo. The Condominium of Rural Employers modified the concept of an employment market for temporary agricultural work, and allowed the contract of employment was longer. The project purpose is to understand why suppliers cane deployed the Condominium of Rural Employers in the State of Sao Paulo. The methodological procedures for the study on the meeting of suppliers Condominiums Employers combined qualitative research with interviews, and observations, as well as bibliographic, and documentary. The expansion of sugar industry in the State gave a twist to the region selected for empirical research, consisting of municipalities of the West, and northwest of the State of Sao Paulo. The Condominium of Rural Employers met sugarcane suppliers, it feasible to increase scale of production, and held various positions as a way of organizing production, and work.
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