TY - CONF A1 - Hussels, Maria-Teresa A1 - Gründer, Klaus-Peter A1 - Muschik, Bernd T1 - Vergleichsmessungen mit einem neuen schnellen Bispektralmessplatz zur Charakterisierung fluoreszierender Materialien N2 - Die verbesserte Sichtbarkeit fluoreszierender Materialien erhöht die Sicherheit in vielen Bereichen. Mit der 2-Monochromatoren-Methode können diese bestrahlungsunabhängig charakterisiert werden. In Hinblick auf einen Einsatz im Prüflabor (DIN EN ISO/IEC 17025) werden Vergleichsmessungen mit dem modernisierten Messplatz der BAM unter Nutzung eines Arrayspektrometers präsentiert. T2 - 114. Jahrestagung der deutschen Gesellschaft für angewandte Optik CY - Braunschweig, Germany DA - 21.05.2013 KW - Spektroskopie KW - Photometrie KW - Radiometrie PY - 2013 SN - 1614-8436 N1 - Serientitel: DGaO-Proceedings – Series title: DGaO-Proceedings IS - 114 SP - 1 EP - 2 (Beitrag B19) PB - Deutsche Gesellschaft für angewandte Optik CY - Erlangen AN - OPUS4-28958 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Muschik, Bernd A1 - Hussels, Maria-Teresa A1 - Gründer, Klaus-Peter A1 - Pötschke, Samuel T1 - Spektraloptische Verfahren zur Charakterisierung fluoreszierender Materialien T2 - 39. Jahrestagung der deutschen farbwissenschaftlichen Gesellschaft (DfwG) CY - Ilmenau, Germany DA - 2013-10-08 PY - 2013 AN - OPUS4-29288 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Noack-Schönmann, Steffi A1 - Spagin, Olga A1 - Gründer, Klaus-Peter A1 - Breithaupt, Mathias A1 - Günther, Achim A1 - Muschik, Bernd A1 - Gorbushina, Anna T1 - Sub-aerial biofilms as blockers of solar radiation: spectral properties as tools to charcterise material-relevant microbial growth N2 - Sub-aerial biofilms (SABs) are ubiquitous microbial communities that develop at the interface between hard surfaces and the atmosphere. Inherent SAB 'core-settlers' include phototrophic algae, cyanobacteria, heterotrophic bacteria and microcolonial fungi (MCF). SABs do not simply cover hard surfaces; they interact with them in myriads of ways and bind to the underlying substrate. Secretion of extracellular mucilage aids adhesion, while organic acids and acidic polysaccharides weather the surface. As protection against solar radiation, many members of the SAB consortia produce shielding pigments while the phototrophic inhabitants are laden with photosynthetic pigments. All absorb light of many wavelengths and in addition, the cells themselves scatter light. Both effects change the spectra of incoming radiation (including wavelengths that are converted to electricity by photovoltaic cells) and decrease its intensity. To quantify these effects on SABs as complex entities of organisms and pigments, we measured the spectral properties of model and natural biofilms transferred to glass. Here we show that SABs growing on solar panels and other substrates scatter incident radiation between 250 nm up to 1800 nm and block up to 70% of its transmission. Model biofilms have the advantage that their microbial components can be 'tuned' to resemble natural ones of different compositions thus providing a novel materials-testing tool. KW - Material-colonising microorganisms KW - Microcolonial fungi KW - Glass biodeterioration KW - Solar panels KW - Biofilm-impaired transmittance of radiation PY - 2014 DO - https://doi.org/10.1016/j.ibiod.2013.09.020 SN - 0964-8305 VL - 86 SP - 286 EP - 293 PB - Elsevier CY - Barking AN - OPUS4-30128 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -