Michael Oberhuber

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Senescent higher plants degrade their chlorophylls (Chls) to polar colorless tetrapyrrolic Chl catabolites, which accumulate in the vacuoles. In extracts from degreened leaves of the tree Cercidiphyllum japonicum an unpolar catabolite of this type was discovered. This tetrapyrrole was named Cj-NCC-2 and was found to be identical with the product of a(More)
In extracts of senescent leaves of spinach (Spinacia oleracea), five colourless compounds with UV/Vis-characteristics of nonfluorescent chlorophyll catabolites (NCCs) were detected and tentatively named So-NCCs. The most abundant polar NCC in the leaves of this vegetable, So-NCC-2, had been isolated earlier and its constitution was determined by(More)
Debugging still is one of the most time consuming phases in programming high performance parallel computers. Parallel debuggers can greatly support users in this process and thus reduce time needed for program development. However, most debuggers either don’t provide easy-to-use interfaces and therefore are rejected by lots of potential users, or are usable(More)
Twenty years ago, the molecular basis for the seasonal disappearance of chlorophyll was still enigmatic. In the meantime, our knowledge on chlorophyll breakdown has grown considerably. As outlined here, it has been possible to decipher the basic transformations involved in natural chlorophyll breakdown by identification of chlorophyll catabolites in higher(More)
In the eld of high performance computing, massively parallel processing systems (MPPs) get more and more important. A rising number of complex applications is parallelized for execution on these machines. Still a signiicant portion of the time needed for parallelization is spent for the process of debugging and performance tuning. A main reason for this(More)
Writing parallel programs eeciently is still a problematic issue due to the lack of a uniform and integrated tool support. A new project at LRR-TUM works towards changing this situation for the most popular programming environment on workstation clusters: for PVM. The Tool-set for PVM will comprise a set of integrated tools, consisting of a debugger, a(More)
The corrinoids from the obligate anaerobe Clostridium cochlearium were extracted as a mixture of Co(beta)-cyano derivatives. From 50 g of frozen cells, approximately 2 mg (1.5 micromol) of B(12) derivatives was obtained as a crystalline sample. Analysis of the corrinoid sample of C. cochlearium by a combination of high-pressure liquid chromatography and(More)