Single-celled organisms.

Explica los organismos microscópicos cómo bacterias, protozoos y levaduras. Los estudiantes de entre once y catorce años aprenden la descomposición de los alimentos por las bacterias, la diferencia entre bacterias beneficiosas y patógenas, cómo un virus invade una célula huésped o cómo las levaduras crecen y se multiplican.

Information and communication technology for Edexcel applied AS level single award.

Esta escrito para apoyar las nueva especificación Edexcel AS en las tecnologías de la información y la comunicación (ICT). Su contenido se estructura en tres unidades: la edad de la información; la economía digital; y el trabajador del conocimiento.

Information and communication for AQA applied AS single award.

Esta escrito para ayudar a los profesores y estudiantes en la preparación del curso sobre las tecnologías de la información y de la comunicación (ICT) para las especificaciones AQA AS. Su contenido se estructura en cuatro secciones, la primera trata de las ICT y la sociedad; la segunda sobre las ICT y las organizaciones; la tercera sobre utilización de datos; y la última sobre portfolios.

Information and communication technology for Edexcel applied A2 level single award.

Libro para estudiantes de tecnologías de la información y la comunicación, de enseñanza secundaria - bachillerato, orientado a la consecución del certificado de Edexcel nivel A2. Contiene las unidades 7 a 12 y cubre las siguientes materias: uso de bases de datos, gestión de proyectos TIC, uso de programas multimedia, uso de hojas de cálculo, y personalización de aplicaciones. Incluye proyectos de ejemplo y casos de estudio que permiten al alumno entender cómo planificar, producir, revisar y presentar sus propios porfolios digitales. Cd-rom con material de apoyo.

Si3N4 single-crystal nanowires grown from silicon micro- and nanoparticles near the threshold of passive oxidation

A simple and most promising oxide-assisted catalyst-free method is used to prepare silicon nitride nanowires that give rise to high yield in a short time. After a brief analysis of the state of the art, we reveal the crucial role played by the oxygen partial pressure: when oxygen partial pressure is slightly below the threshold of passive oxidation, a high yield inhibiting the formation of any silica layer covering the nanowires occurs and thanks to the synthesis temperature one can control nanowire dimensions

Charge transfer in DNA: hole charge is confined to a single base pair due to solvation effects

We include solvation effects in tight-binding Hamiltonians for hole states in DNA. The corresponding linear-response parameters are derived from accurate estimates of solvation energy calculated for several hole charge distributions in DNA stacks. Two models are considered: (A) the correction to a diagonal Hamiltonian matrix element depends only on the charge localized on the corresponding site and (B) in addition to this term, the reaction field due to adjacent base pairs is accounted for. We show that both schemes give very similar results. The effects of the polar medium on the hole distribution in DNA are studied. We conclude that the effects of polar surroundings essentially suppress charge delocalization in DNA, and hole states in (GC)n sequences are localized on individual guanines

Single and multiple addition to C60. A computational chemistry study

Des del seu descobriment, a la molècula C60 se li coneixen una varietat de derivats segons el tipus de funcionalització amb propietats fisicoquímiques específiques de gran interès científic. Una sel·lecció de derivats corresponents a addicions simple o múltiple al C60 s'ha considerat en aquest treball d'investigació. L'estudi a nivell de química computacional de diversos tipus d'addició al C60 s'han portat a terme per tal de poder donar resposta a aspectes que experimentalment no s'entenen o són poc clars. Els sistemes estudiats en referència a l'addició simple al C60 han estat en primer lloc els monoiminoful·lerens, C60NR, (de les dues vies proposades per la seva síntesi, anàlisis cinètic i termodinàmic han ajudat a explicar els mecanismes de formació i justificar l'addició a enllaços tipus [5,6]), i en segon lloc els metanoful·lerens i els hidroful·lerens substituits, C60CHR i C60HR, (raons geomètriques, electròniques, energètiques i magnètiques justifiquen el diferent caràcter àcid ente ambdós derivats tenint en compte una sèrie de substituents R amb diferent caràcter electrònic donor/acceptor). Els fluoroful·lerens, C60Fn, i els epoxid ful·lerens, C60On, (anàlisi sistemàtic dels seus patrons d'addició en base a poder justificar la força que els governa han aportat dades complementàries a les poques que existeixen experimentalment al respecte).

Comparison of two single-channel tactile aids for the deaf

This paper reviews a study to compare two commercially available single-channel tactile aids for the deaf.

Observations on the effects of a single-channel cochlear implant on a seven year old

This paper presents observations on the effects of a single-channel cochlear implant on a seven year-old hearing impaired child.

The use of a single channel, two attenuator hearing aid by severely hearing impaired children

This paper examines the results of testing five severely hearing impaired children using a special binaural system with s single amplification channel and two attenuators, allowing presentation of the stimulus materials monaurally or at different relative levels to the two ears.

Pre-empting technical barriers in the Single Market. CEPS Policy Brief No. 277, 11 July 2012

Effective enforcement and compliance with EU law is not just a legal necessity, it is also of economic interest since the potential of the Single Market will be fully exploited. Enforcement barriers generate unjustified costs and hindrances or uncertainty for cross-border business and might deprive consumers from receiving the full benefit of greater choice and/or cheaper offers. The EU has developed several types of enforcement efforts (preventive initiatives, pre-infringement initiatives and formal infringement procedures). More recently, the emphasis has been placed on effective prevention. This CEPS Policy Brief analyses the functioning of one preventive mechanism (the 98/34 Directive) and assesses its potential to detect and prevent technical or other barriers in the course of the last 25 years. Based on an empirical approach, it shows that this amazing mechanism has successfully prevented thousands of new technical barriers from arising in the internal goods market.

Europe's single supervisory mechanism and the long journey towards banking union. Bruegel Policy Contribution 2012/16, 4 October 2012

Problems in the banking system are at the core of the current crisis. The establishment of a banking union is a necessary (though not sufficient) condition for eventual crisis resolution that respects the integrity of the euro. The European Commission’s proposal for the establishment of a Single Supervisory Mechanism and related reform of the European Banking Authority (EBA) do not and cannot create a fully-fledged banking union, but represent a broadly adequate step on the basis of the leaders’ declaration of 29 June 2012 and of the decision to use Article 127(6) of the treaty as legal basis. The proposal rightly endows the European Central Bank (ECB) with broad authority over banks within the supervisory mechanism’s geographical perimeter; however, the status of non-euro area member states willing to participate in this mechanism, and the governance and decision-making processes of the ECB in this respect, call for further elaboration. Further adjustments are also desirable in the proposed reform of the EBA, even though they must probably retain a stopgap character pending the more substantial review planned in 2014.