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Today, more than 70 million tons of lignin are produced by the pulp and paper industry every year. However, the utilization of lignin as a source for chemical synthesis is still limited due to the complex and heterogeneous lignin structure. The purpose of this study was a selective photodegradation of industrially available kraft lignin in order to obtain appropriate fragments and building block chemicals for further utilization, e.g. polymerization. Thus, kraft lignin obtained from soft wood black liquor by acidification was dissolved in sodium hydroxide and irradiated at a wavelength of 254 nm with and without the presence of titanium dioxide in various concentrations. Analyses of the irradiated products via SEC showed decreasing molar masses and decreasing polydispersity indices over time. At the end of the irradiation period the lignin was depolymerised to form fragments as small as the lignin monomers. TOC analyses showed minimal mineralisation due to the depolymerisation process.
Exosomes derived from human autologous conditioned serum are nanocarriers for IL-6 and TNF-alfa
(2017)
In der Regel werden für die Hundeausbildung lose Explosivstoffe im Grammbereich eingesetzt. Deren Umgang unterliegt jedoch aufgrund des Gefährdungspotenzials und aus rechtlichen Gründen sehr strikten Regeln. Diese können nur mit Schwierigkeiten mit den Erfordernissen der Hundeausbildung in Einklang gebracht werden. Der Umgang mit hoch-brisanten Zündstoffen und Selbstlaboraten (z.B. TATP und HMTD) stellt aufgrund der nochmals erhöhten Gefährlichkeit und zusätzlicher gesetzlicher Regelungen eine spezielle Herausforderung dar. Das Poster beschreibt die EMPK® (Echtstoff-Mikromengen-Prüfkörper), die eine sichere Alternative als Trainingshilfsmittel für Sprengstoffspürhunde darstellen.
Raman-microspectroscopy was used for the non-destructive characterization and differentiation of six different meat spoilage associated microorganisms, namely Brochothrix thermosphacta DSM 20171, Micrococcus luteus, Pseudomonas fluorescens DSM 4358, Escherichia coli Top10 and K12 and Pseudomonas fluorescens DSM 50090. To evaluate and classify the Raman-spectroscopic data at species and strain level an adequate preprocessing and subsequent principal component analysis was used. The same procedure was extended to an independent test data set, which could be successfully assigned to the correct bacterial species and even to the right strain. The evaluation was not only successful in differentiation of gram-positive and gram-negative bacteria but also the discrimination between the different bacterial species and strains was possible. This means that the training data set, the preprocessing method and the evaluation of the data lead to a robust principal component analysis. Even the correct assignment of unknown samples is possible. The results show that Raman-microspectroscopy in combination with an appropriate chemometric treatment can be a good tool for a rapid examination and classification of microbial cultures.