Das transsexuelle Schneiden als Symptom des zweigeschlechtlichen Weltbildes

Transsexuelle, die sich der geschlechtsangleichenden Operation unterziehen wollen, versuchen, einen seelischen Konflikt körperlich zu beseitigen. Sie privatisieren mit dieser rigiden Ordnung ihres Körpers in die konventionellen Schablonen aber auch das gesellschaftliche Problem der Geschlechterdichotomisierung, funktionieren somit als SymptomträgerInnen und entheben die Normalen bis zu einem gewissen Grad der Konfrontation damit. Je unauffälliger die Transsexualität in Richtung (Trans-)Normalität verschwindet, desto besser können sich die Betroffenen in die Gemeinschaft integrieren. Je auffälliger - transsozial sichtbarer - sie sind, desto geringer ist die soziale Akzeptanz, nicht nur bei Normalen, sondern gerade auch bei den erfolgreich normalisierten zurechtgeschnittenen Transsexuellen. Diese Tendenz zur Anpassung, die einen Operationssog bewirkt, wird durch die öffentlichen Bilder der Medien subtil gefördert aber auch gespiegelt

Voltammetric behaviour of hydrogen peroxide at a silver electrode fabricated from a rewritable digital versatile disc (DVD) and its determination in water samples

In this study we investigated the possibility of applying Ag electrodes manufactured from recordable rewritable digital versatile discs (DVD-RW) for the voltammetric determination of hydrogen peroxide. The calibration plot was linear from 0.087 mM to 3.41 mM hydrogen peroxide with a sensitivity of 58.7 μA mM-1 over this range. A corresponding detection limit of 78.35 μM, based on a signal-to-noise-ratio of 3 was recorded. No interferences were observed by 500 mg L-1 chloride, 50 mg L-1 nitrate, 700 mg L-1 sulphate or 700 mg L-1 carbonate which are found in swimming pool water at these concentrations. Using the multiple standard addition method a percentage recovery of 90.67% with a coefficient of variation of 4.69% (n = 5) was found for a representative swimming pool water concentration of 1.2 mM hydrogen peroxide. Therefore, the performance data suggests that the method is reliable at the concentrations examined in this study and that a rapid, simple, economical and precise method of monitoring hydrogen peroxide in swimming pool and aquaculture applications is possible. © 2013 The Royal Society of Chemistry

Tin Oxide Nanorod Array-Based Electrochemical Hydrogen Peroxide Biosensor

SnO2 nanorod array grown directly on alloy substrate has been employed as the working electrode of H2O2 biosensor. Single-crystalline SnO2 nanorods provide not only low isoelectric point and enough void spaces for facile horseradish peroxidase (HRP) immobilization but also numerous conductive channels for electron transport to and from current collector; thus, leading to direct electrochemistry of HRP. The nanorod array-based biosensor demonstrates high H2O2 sensing performance in terms of excellent sensitivity (379 μA mM−1 cm−2), low detection limit (0.2 μM) and high selectivity with the apparent Michaelis–Menten constant estimated to be as small as 33.9 μM. Our work further demonstrates the advantages of ordered array architecture in electrochemical device application and sheds light on the construction of other high-performance enzymatic biosensors

Measurement Uncertainty Estimation in Amperometric Sensors: A Tutorial Review

This tutorial focuses on measurement uncertainty estimation in amperometric sensors (both for liquid and gas-phase measurements). The main uncertainty sources are reviewed and their contributions are discussed with relation to the principles of operation of the sensors, measurement conditions and properties of the measured samples. The discussion is illustrated by case studies based on the two major approaches for uncertainty evaluation–the ISO GUM modeling approach and the Nordtest approach. This tutorial is expected to be of interest to workers in different fields of science who use measurements with amperometric sensors and need to evaluate the uncertainty of the obtained results but are new to the concept of measurement uncertainty. The tutorial is also expected to be educative in order to make measurement results more accurate

Magnetic Particle-Based Hybrid Platforms for Bioanalytical Sensors

Biomagnetic nano and microparticles platforms have attracted considerable interest in the field of biological sensors due to their interesting physico-chemical properties, high specific surface area, good mechanical stability and opportunities for generating magneto-switchable devices. This review discusses recent advances in the development and characterization of active biomagnetic nanoassemblies, their interaction with biological molecules and their use in bioanalytical sensors