Droplet microreactor for reaction monitoring at elevated temperatures and pressure

Recording reaction kinetics in detail and at various reaction conditions can be a time-consuming process. Microdroplets form ideal reaction chambers, suitable for high-throughput studies [1]. We report the fabrication of a microfluidic droplet-based microreactor operating at elevated temperatures (up to 130 °C) and pressures (up to 0.7 MPa), to rapidly study reaction kinetics. As proof-of-principle, the temperature-dependent fluorescence of Rhodamine B in ethanol is monitored [2]. Time-resolved information is obtained by measuring at multiple spots in the microreacto

Templated self-assembly of colloidal nanoparticles controlled by electrostatic nanopatterning on a Si3N4/SiO2/Si electret

Controlled self-assembly of colloidal nanoparticles onto an electrically nanopatterned electret film is presented (see figure; EFM: electrostatic force microscopy). An unprecedented reolution of 30 nm is achieved for both charge patterning and nanoparticle assembly. Furthermore, only a close-packed monolayer of nanoparticles is assembled, allowing better structural control and the possibility of forming hierarchical nanoparticle structures

Estrutura fina do espermatozóide de Mellita quinquiesperforata Leske (Echinodermata) do litoral norte do Brasil Fine structure of the spermatozoon of the Mellita quinquiesperforata (Echinodermata) of the Northern littoral of Brazil

<abstract language="eng">The fine structure of the spermatozoon in the Mellita quinquiesperforata Leske, 1778 was studied. Collected from the Amazon region, were described by light and transmission electron microscopy. The spermatozoon consisted of a acrosome complex, nucleus, four to six mitochondria, two centrioles and flagellum. The acrosome was composed of a acrosome complex, the acrosomal vesicle and the subacrosomal space. The nucleus are composed by dense material. The middle piece contains 4-6 mitochondria which are arranged around the centrioles, the 9p+0, whose axoneme has the classic 9p+2 microtubular construction