Publications by authors named "Wohlfahrt S"
The design of the so-called "Peltier modulator" is presented. It is a new dual-stage consumable-free thermal modulator for thermal analysis-gas chromatography-mass spectrometry (TA-GC-MS). It requires only electrical power for operation as it facilitates thermo-electric coolers instead of cryogenics for trapping and resistive on-column heating for reinjection.
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- - This research introduces a new ultrafast-cycling gas chromatography module (fast-GC module) for direct-sampling gas chromatography/mass spectrometry (GC-MS) that can complete a temperature cycle in just 30 seconds.
- - The module uses a unique fused silica capillary column stack and a halogen lamp for efficient heating, along with a high airflow blower for quick cooling, making it adaptable to various separation columns and temperature programs.
- - An application of the fast-GC module is demonstrated with thermal analysis coupled to GC-MS, allowing improved gas separation while preserving the online analytical process, overcoming limitations seen in traditional fast-GC systems.
Comprehensive multi-dimensional hyphenation of a thermogravimetry device (i.e. a thermobalance) to gas chromatography and single photon ionization-time-of-flight mass spectrometry (TG-GC×SPI-MS) has been used to investigate two crude oil samples of different geographical origin.
View Article and Find Full Text PDFThe tuatara Sphenodon punctatus, restricted to a few New Zealand offshore islands and now strictly protected, belongs to the Rhynchocephalia, the smallest order of extant reptiles. Earlier light microscopical studies on the retina of this species described photoreceptors with both rod- and cone-like features and the presence of a fovea. A limited amount of retinal material from S.
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