Michael Hassel

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Regeneration experiments in Hydra have shown that lithium long-term treatment apparently causes a transformation of prospective head into foot tissue. Although lithium ions are known to interfere with the PI-PKC signal-transduction system and evidence has been provided that this system plays a role in pattern formation in Hydra, its role in mediating the(More)
Oxidative metabolism of radioactively labeled N-nitrodimethylamine in rats was compared with that of N-nitromethylamine. Within 7 h, 20% of N-nitrodimethylamine was metabolized to CO2 but only 4% of N-nitromethylamine. The poor oxidative metabolism of N-nitromethylamine is also reflected in the blood levels determined after i.v. administration to(More)
Context-aware mobile applications gain more and more influence on our daily life. Since mobile devices are equipped with various sensors to detect their environment, it is possible to receive and process information from beyond application and device borders. Within the development, these context-aware applications have to be verified to assure that they do(More)
The nasal carcinogen N-nitrodimethylamine was reduced to its N-nitroso analogue N-nitrosodimethylamine in vivo. Liver-soluble fraction and brain mitochondria contained enzymes capable of reducing this compound. The activity was only partly inhibited by oxygen; NADPH and NADH served as cosubstrates. N-Nitromethylamine is also carcinogenic and was reduced by(More)
Lacunar lesions are small infarctions in the territory of small penetrating arteries of the brain. Because of their small size these lesions can only in part be detected by CT. Clinical symptoms do not always correspond with the lesions visible in the CT. We studied the somatosensory evoked potentials (SEP), the visual evoked potentials (VEP) and the(More)
N-Nitrodimethylamine (NTDMA) was found to be a carcinogen of the nasal mucosa leading to aesthesioneuroepitheliomas in BDVI rats. N-Nitromethylamine (NTMA), a product of the oxidative metabolism of NTDMA, was also carcinogenic, leading to neurogenic tumours of the lumbar region of the spine. The 100,000 X g supernatant of both liver and nasal mucosa(More)
The need to support a software architect's day-to-day activities through efficient tool support has been highlighted both in research and industry. However, managing enterprises' Architectural Knowledge (AK) to support scenarios such as decision making, what-if analysis, and collaboration during the execution of large industrial projects is still a(More)
The authors report a case-history of lymphangiosarcoma or Stewart-Treves syndrome which occurred in a patient with posttraumatic lymphedema of the arm. He presented two recurrences after surgery which led to the decision of amputation. He is now disease free nine years after this treatment. Initially defined as "lymphangiosarcoma arising in chronic(More)
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