Michal Tencer

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A theoretical mechanism resulting in the prebiotic appearance of enantiopure ribose, which would be needed for the origin of RNA and the “RNA world” is proposed. The mechanism simultaneously explains the emergence of biological homochirality and could answer the question of why nucleic acids are based on ribose rather than another sugar. Cleavage of certain(More)
Macroscopic chiral objects (boats and planes with turned rudders, shoes, etc.) get separated from their mirror-image counterparts by motion in achiral media. However, chiral molecules are not enantio-differentiated without the presence of a chiral environment, which may be due to other chiral molecules in the medium. This article explores the reasons of(More)
In a recent paper Atencio (2012) proposes a mechanism which in the author’s mind could be responsible for a pre-biotic separation of chiral molecules in the absence of a chiral environment. The author provides a thorough hydrodynamic analysis of particle separation in an aquifer based on their chirality. Without getting into the details of this analysis, we(More)
The paper describes methodology of using three independent macroscopic factors affecting molecular orientation to accomplish separation of a racemic mixture without the presence of any other chiral compounds, i. e., absolute enantioselective separation (AES) which is an extension of a concept of applying these factors to absolute asymmetric synthesis. The(More)
A method of depositing small amounts of solution on flat micron scale surface areas on a hydrophilic substrate or die was developed. This method utilizes the capillarity of a flat, high surface free energy guide. Interfacial forces confine the solution between the guide and the substrate surface. The liquid follows the movement of the guide along the(More)
A method for chemically differentiating the surface of a set of small, closely-spaced, lithographically-defined Au features on a die, from another set of similar features intimately inter-dispersed, is described. The key enabler of the method is a standard electronics probe array adapted to carry out electrochemistry on the features. The probe array is used(More)
We describe a method for the selective desorption of thiol self-assembled monolayers from gold surfaces having micrometer-scale separations on a substrate. In an electrolyte solution, the electrical resistance between the adjacent areas can be much lower than the resistance between a surface and the counter electrode. Also, both reductive and oxidative(More)
Electrochemical Differentiation and TOF-SIMS Characterization of Thiol-Coated Gold Features for (Bio)chemical Sensor Applications Michal Tencer, Heng-Yong Nie, and Pierre Berini School of Information Technology and Engineering and Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada MST Consulting, Ottawa, Ontario K2H 8T3, Canada(More)
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to study a number of processes involving thiol-based self-assembled monolayers (SAMs) on nontextured (polycrystalline) gold (Au) films deposited on Si wafers. ToF-SIMS turned out to be a convenient and versatile semiqualitative technique which readily verified electrochemical desorption of a(More)
In this paper the risk associated with deposition of aerosol (‘‘hygroscopic dust”) on printed circuit boards is assessed for different equipment designs and deployment. The amount of deposited dust is related to (1) the total dust availability in a given type of equipment and (2) to the rate of deposition of dust due to different mechanisms. Of these, the(More)
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