Accedi

Universität Hamburg

3 ARTICLES PUBLISHED IN JoVE

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 Peckmann⁵, Yang Lu^2,3, Harald Strauss⁶, Li Xu^2,3, Hongfeng Lu⁷, Barbara M.A. Teichert⁶

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.

JoVE Journal

Phloem Sap Sampling from Brassica napus for 3D-PAGE of Protein and Ribonucleoprotein Complexes

Steffen Pahlow¹, Anna Ostendorp¹, Lena Krüßel¹, Julia Kehr¹

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.

JoVE Core

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells

Christina Ossig^1,3, Tara Nietzold², Bradley West², Mariana Bertoni², Gerald Falkenberg¹, Christian G. Schroer^1,3, Michael E. Stuckelberger¹

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.