An optofluidic router in a low-cost (PDMS) platform for rapid parallel sample analysis

En col·laboració amb la Universitat de Barcelona (UB), la Universitat Autònoma de Barcelona (UAB) i l'Institut de Ciències Fotòniques (ICFO)Optofluidic system for (bio)chemical applications are becoming more demanding in terms of num- ber of control points, number of light sources and readout equipment. So far, most of these sys- tems require several light sources/detectors for suitable performance, increasing their complexity and cost. In this work, we present an easily integrated, fluidically controlled optical router that fa- cilitates coupling of several light sources or detectors. By using PDMS mirrors and phaseguides, the switching liquid is guided and pinned in desired angles, so that the incident light undergoes total internal reflection and can be reflected towards the output channels without any movable parts. The developed router presents ideal performance for lab on a chip applications, achieving switching frequencies between 0.07 ± 0.025 and 4 ± 2 Hz, depending on the flow rate of the switching liquid. The cross-talk levels are at 20 dB from channel output power to static noise level. With the use of parabolic mirrors, channel coupling efficiencies decrease just 2.38 dBm over four channels. The dynamic switching noise reduces the cross-talk levels by 2-5 dB, depending on the incorporation of ink-apertures. The insertion loss of these devices ranges from 17.34 to 25.42 dB. These results prove the viability of the fluidically controlled router in the low-cost PDMS platform. The intended goal of this work has been to simplify and speed up parallel sample analysis with the router integrated into a multiple path photonic component on a single chip. Development on this front is ongoing to rapidly measure methadone concentrations on chip

Lie monads and dualities

We study dualities between Lie algebras and Lie coalgebras, and their respective (co)representations. To allow a study of dualities in an infinite-dimensional setting, we introduce the notions of Lie monads and Lie comonads, as special cases of YB-Lie algebras and YB-Lie coalgebras in additive monoidal categories. We show that (strong) dualities between Lie algebras and Lie coalgebras are closely related to (iso)morphisms between associated Lie monads and Lie comonads. In the case of a duality between two Hopf algebras -in the sense of Takeuchi- we recover a duality between a Lie algebra and a Lie coalgebra -in the sense defined in this note- by computing the primitive and the indecomposables elements, respectively.Comment: 27 pages, v2: some examples added and minor change

Regular expressions cookbook

This cookbook provides more than 100 recipes to help you crunch data and manipulate text with regular expressions. Every programmer can find uses for regular expressions, but their power doesn't come worry-free. Even seasoned users often suffer from poor performance, false positives, false negatives, or perplexing bugs. Regular Expressions Cookbook offers step-by-step instructions for some of the most common tasks involving this tool, with recipes for C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET. With this book, you will: Understand the basics of regular expressions through

High-yield parallel transfer print integration of III-V substrate-illuminated C-band photodiodes on silicon photonic integrated circuits

Transfer printing is an enabling technology for the efficient integration of III-V semiconductor devices on a silicon waveguide circuit. In this paper we discuss the transfer printing of substrate-illuminated III-V C-band photodetectors on a silicon photonic waveguide circuit. The devices were fabricated on an InP substrate, encapsulated and underetched in FeCl3, held in place by photoresist tethers. Using a 2x2 arrayed PDMS stamp with a pitch of 500 mu m in x-direction and 250 mu m in y-direction the photodiodes were transfer printed onto DVS-BCB-coated SOI waveguide circuits interfaced with grating couplers. 83 out of 84 devices were successfully integrated

Micropropagation of marula, Sclerocarya birrea subsp. caffra (Anarcadiaceae) by axillary bud proliferation and random amplified polymorphic DNA (RAPD) analysis of plantlets

The availability of a rapid vegetative amplification procedure of mass-selected superior trees greatly accelerates the development of a new tree species as a crop. This study outlined the protocol for in vitro propagation of marula nodal explants from marula seedlings. Surface sterilized explants were cultured on Murashige and Skoog media (MS) supplemented with 26 combinations of N6-benzyladenine (BA) and kinetin (KN). Shoots were elongated on MS media supplemented with low BA and KN or BA and Gibberellin A3 (GA3) concentrations. Elongated shoots were rooted on half strength MS media supplemented with indolebutyric acid (IBA) at differing concentrations. MS media supplemented with 4.8 µM BA and 2.4 ìM KN resulted in average 2.5 shoots per responding explant. Moderate shoot elongation was achieved on MS media supplemented with 1.2 µM BA plus 1.0 µM KN. Maximum rooting was observed on half- strength MS media supplemented with 10 µM IBA. Marula plants were acclimatized and established in soil in the growth room at an average micropropagation rate of 0.56 per responding nodal explant. The developed protocol has potential for routine micropropagation of elite Sclerocarya birrea subsp. caffra. Randomly amplified polymorphic DNA (RAPD) analysis scoring 1845 markers showed intraclonal genetic stability between explant parent and micropropagated plants.Key words: Anacardiaceae, axillary bud proliferation, marula, randomly amplified polymorphic DNA (RAPD), somaclonal variation

The possibility of positive selection for both F18(+) Escherichia coli and stress resistant pigs opens new perspectives for pig breeding

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