The marine bacterium Halomonas venusta (Deleya venusta) develops a strong odour of fresh peas. Bacteria were cultivated in ZoBell medium with the addition of artificial sea water. Air was purged through the culture vessel and then trapped in a column filled with RP 18 silica gel.1 H-NMR and GC-MS analysis of the adsorbed volatile revealed 2-methoxy-3-(1 0 -methylpropyl)pyrazine (MMPP). The substance was synthesized only in the idiophase. The addition of high amounts of glycine and isoleucine to the ZoBell medium doubled the cell dry weight (1.92 g/l) and raised the yield of MMPP (9.8 mg/l). The presumed intermediate, 2,5-dioxo-3-(1-methylpropyl)piperazine, was found in the cells growing on agar plates.

No abstract

Scenario-aware dataflow is a formalism to model modern dynamic embedded applications whose behaviour is heavily dependent on input data or the operational environment. Key behavioural aspects are the execution times and energy consumption of a system's components. In this paper, we introduce flexible scenario-aware dataflow : a proper generalisation of previous definitions that allows any execution time to be specified as discretely or continuously random or nondeterministic. Additionally, it supports the modelling of abstract costs like the energy usage of components. We give a formal compositional semantics in terms of networks of stochastic timed automata. We have implemented support for analysing performance properties of flexible scenario-aware dataflow graphs via simulation and model checking. A number of reduction techniques are applied to make the underlying state spaces tractable for model checking. We evaluate the scalability and performance of our new model and implementation on standard benchmarks.

Viscum album L., Head Space Analysis, Farnesene (E,E)-α-Farnesene was extracted as the main component of the volatile fraction of male Viscum album L. Male and female flowers of V. album L. growing on different host trees were analysed by solid phase microextraction and by lipophilic extraction.

Pinguisane Sesquiterpenes from the Liverwort Porella navicularis. -From the diethyl ether extract of the title liverwort four novel sesquiterpenes of the pinguisane-type such as (I)-(III) besides five known compounds are isolated. -(BUNGERT, M.; GABLER, J.; ADAM, K.-P.; ZAPP, J.; BECKER, H.; Phytochemistry 49 (1998) 4, 1079-1083; Fachrichtung Pharmakogn. Anal.