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Universität Hamburg

3 ARTICLES PUBLISHED IN JoVE

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Environment

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
Zhiyong Lin 1,3, Xiaoming Sun 1,2,3,4, Jörn Peckmann 5, Yang Lu 2,3, Harald Strauss 6, Li Xu 2,3, Hongfeng Lu 7, Barbara M.A. Teichert 6
1School of Earth Sciences and Engineering, Sun Yat-sen University, 2School of Marine Sciences, Sun Yat-sen University, 3Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, 4South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, 5Institut für Geologie, Universität Hamburg, 6Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, 7Guangzhou Marine Geological Survey

Analyses of the sulfur isotopic composition (δ34S) of pyrite from methane-bearing sediments have typically focused on bulk samples. Here, we applied secondary ion mass spectroscopy to analyze the δ34S values of various pyrite generations to understand the diagenetic history of pyritization.

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JoVE Journal

Phloem Sap Sampling from Brassica napus for 3D-PAGE of Protein and Ribonucleoprotein Complexes
Steffen Pahlow 1, Anna Ostendorp 1, Lena Krüßel 1, Julia Kehr 1
1Molecular Plant Genetics, Universität Hamburg

Here we present a protocol to analyze the protein composition of large native protein:protein and protein:nucleic acid complexes from oilseed rape (B. napus) phloem exudate using a 3D polyacrylamide gel electrophoresis (PAGE) approach combining blue native (BN) with two denaturing PAGEs followed by mass spectrometric identification.

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JoVE Core

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
Christina Ossig 1,3, Tara Nietzold 2, Bradley West 2, Mariana Bertoni 2, Gerald Falkenberg 1, Christian G. Schroer 1,3, Michael E. Stuckelberger 1
1Deutsches Elektronen-Synchrotron, 2School of Electrical, Computer and Energy Engineering, Arizona State University, 3Department Physik, Universität Hamburg

A setup for X-ray beam induced current measurements at synchrotron beamlines is described. It unveils the nanoscale performance of solar cells and extends the suite of techniques for multi-modal X-ray microscopy. From wiring to signal-to-noise optimization, it is shown how to perform state-of-the-art XBIC measurements at a hard X-ray microprobe.

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