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Oral presentation given at the International Magnetics Conference (INTERMAG Europe 2017), held in Dublin (Ireland) on April 24-28th, 2017., The number of biomedical applications using colloidal magnetic iron oxide nanoparticles has been increasing exponentially over the past few years [1]. Several approaches exist to obtain single-core and multi-core particles but the production of particles with good control of the number of magnetic cores per particle, and the degree of polydispersity of both, particle and core sizes is still a difficult task [2-5]. In addition, the magnetic properties of the nanoparticles may change significantly depending on their aggregation degree (and further agglomeration), which depends to a large extent on the synthesis method [6]. The complexity of the problem of understanding the different magnetic properties of single-core and multi-core nanoparticles underlies the importance of reliable synthesis methods able to reproduce nanoparticle size, shape and structural homogeneity. Here, we present different synthesis strategies in organic, polyol and aqueous media for colloidal single-core and multi-core iron oxide nanoparticles for biomedical applications (Fig. 1). We explore the factors determining the monodispersity in terms of size and shape and the core assembly, and discuss their implication on the resulting structural, colloidal and magnetic properties. We will show that reliable and reproducible analysis methods are also needed to characterize the different magnetic particle systems [7]. For example, in order to compare size parameters precisely determined from different methods and models, it is crucial to establish standardized analysis methods and models to extract reliable parameters from the data, which are necessary both for defining magnetic nanoparticle systems and for quality control during the synthesis of magnetic nanoparticles. Many parameters of the synthesis procedure may have a strong effect on the particles obtained, including temperature, reaction time, reagent concentrations, and stirring conditions. This is one of the reasons why scaling-up of some of these synthesis routes is extremely complicated. Indeed, one of the difficulties that particle synthesis faces is batch-to batch reproducibility. Other important difficulty is the fundamental and pressing need to develop more sustainable protocols, using less toxic reagents in a more efficacious manner.

Fragestellung: Orthopädische Krankheitsbilder treten auffallend häufig bei Patienten mit angeborenen Gefäßschäden, im Sinne der Malformationen auf (Laurian et al. 1996, Loose et al., 2004). Im Rahmen von Voruntersuchungen konnten wir eine spezifisch mit angeborenen Gefäßpathologien[for full text, please go to the a.m. URL], Deutscher Kongress für Orthopädie und Unfallchirurgie; 73. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 95. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 50. Tagung des Berufsverbandes der Fachärzte für Orthopädie

An experimental TV distribution network based on coherent optical systems is being set up as part of a Heinrich-Hertz Institute research project. It is designed for TV distribution on future public optical networks and demonstrates the opportunities for future single-mode optical networks.

A coherent, optical, multichannel television distribution system with 140 Mbit/s CMI-coded, optical FSK modulation, is described. The system is operated over 11 km monomode optical fibres. The transmitter modules are controlled via a polarisation-independent monitoring unit, using optical fibre technology. The superheterodyne receivers are equipped with an optical polarisation-diversity input. A sensitivity of -48.8 dBm is achieved, with an intermediate frequency linewidth of more than 80 MHz. System performance parameters are detected over a time-period of 54 hours.