Cruise Report R.V. Littorina, Cruise No.: L20-11

15.06. - 19.06.2020 Areas of research: Public relations and Aquarium West Shore Port Calls: Grenå DK (15.06. - 18.06.2020, 3 nights) Acquisition of living marine organisms for the public relations division (GEOMAR), the institute´s own aquarium and the Multimar Wattforum (Tönning) in the northern Kattegat

Cruise Report F. K. Littorina L18-05 2018

Areas of research: Public relations and Aquarium West Shore Port Calls: Osterby / Lӕsø DK (15.05. - 16.05.2018) & Grenå DK (16.05. - 17.05.2018

Generation of periodic surface structures on silica fibre surfaces using 405 nm CW diode lasers

Periodic surface structures have been observed on the end surfaces of synthetic silica fibres when they are exposed to long-term irradiation with light from a 405 nm CW diode laser. The surface structures are generated when the laser power is at a level which is three magnitudes of order lower than that of the damage threshold. They exhibit multiple bends, break-ups and bifurcations, unlike interference patterns but rather like the effect caused by short-pulsed laser irradiation on wide band-gap insulators. The detailed investigation undertaken in this work has concluded that the key parameters that contribute to the generation of the surface structures are power density, surface roughness, polarisation direction and the presence of ultraviolet defect centres

Super-resolution imaging of tight and adherens junctions: Challenges and open questions

The tight junction (TJ) and the adherens junction (AJ) bridge the paracellular cleft of epithelial and endothelial cells. In addition to their role as protective barriers against bacteria and their toxins they maintain ion homeostasis, cell polarity, and mechano-sensing. Their functional loss leads to pathological changes such as tissue inflammation, ion imbalance, and cancer. To better understand the consequences of such malfunctions, the junctional nanoarchitecture is of great importance since it remains so far largely unresolved, mainly because of major difficulties in dynamically imaging these structures at sufficient resolution and with molecular precision. The rapid development of super-resolution imaging techniques ranging from structured illumination microscopy (SIM), stimulated emission depletion (STED) microscopy, and single molecule localization microscopy (SMLM) has now enabled molecular imaging of biological specimens from cells to tissues with nanometer resolution. Here we summarize these techniques and their application to the dissection of the nanoscale molecular architecture of TJs and AJs. We propose that super-resolution imaging together with advances in genome engineering and functional analyses approaches will create a leap in our understanding of the composition, assembly, and function of TJs and AJs at the nanoscale and, thereby, enable a mechanistic understanding of their dysfunction in disease

Die geneigten Vokale als Reflexe altpolnischer Laengen im Woerterbuch von Jan Mączyński

Das Lexikon von Jan Mączyński (Lexicon latino-polonicum ex optimis latinae linguae scriptoribus concinnatum - Ioanne Maczynski equite polono interprete, Regiomonti 1564) ist das erste große polnische Wörterbuch, dessen Entstehung in das 16. Jh. fällt, in ein Jahrhundert also, das auf allen Gebieten des geistigen Lebens in Polen Hervorragendes geleistet hat

Wochenbericht L17-12

F.K. Littorina Cruise No.: L17-12 Date of cruise: 10.07. – 14.07.2017 Areas of research: Public relations and Aquarium West Shore Port Calls: Osterby / Lӕsø DK (11.07.-12.07.2017) & Grenå DK (12.07.-13.07.2017

High power 405 nm diode laser fiber-coupled single-mode system with high long-term stability

Fiber-coupled 405 nm diode laser systems are rarely used with fiber output powers higher than 50 mW. A quick degradation of fiber-coupled high power modules with wavelengths in the lower range of the visible spectrum is known for several years. Meanwhile, the typical power of single-mode diode lasers around 400 nm is in the order of 100 to 300 mW, leading to single-mode fiber core power densities in the 1 MW/cm² range. This is three magnitudes of order below the known threshold for optical damage. Our profound investigations on the influence of 405 nm laser light irradiation of single-mode fibers found the growth of periodic surface structures in the form of ripples responsible for the power loss. The ripples are found on the proximal and distal fiber end surfaces, negatively impacting power transmission and beam quality, respectively. Important parameters in the generation of the surface structures are power density, surface roughness and polarization direction. A fiber-coupled high-power 405 nm diode laser system with a high long-term stability will be introduced and described

Die geneigten Vokale als Reflexe altpolnischer Laengen im Woerterbuch von Jan Mączyński

Das Lexikon von Jan Mączyński (Lexicon latino-polonicum ex optimis latinae linguae scriptoribus concinnatum - Ioanne Maczynski equite polono interprete, Regiomonti 1564) ist das erste große polnische Wörterbuch, dessen Entstehung in das 16. Jh. fällt, in ein Jahrhundert also, das auf allen Gebieten des geistigen Lebens in Polen Hervorragendes geleistet hat

F.K. Littorina Cruise No.: L15-08 Cruise Report

Dates of Cruise: 4.5. – 7.5.2015 Areas of Research: Public relations and aquarium west shore Port Calls: Osterby/Laeso (4.5. – 7.5.2015