BACKGROUND: Lovastatin is known to inhibit its own synthesis in the fungus Aspergillus terreus. Therefore, the use of a fermentation strategy that continuously removes some of the lovastatin produced from the bioreactor can enhance its productivity. This paper reports on the effects of dilution rate and the composition of the feed medium on lovastatin production by A. terreus. RESULTS: The feed...

The rescue robots developed at the International University Bremen (IUB) are semi-autonomous mobile robots providing streams of video and other essential data via wireless connections to human operated basestations, supplemented by various basic and optional behaviors on board of the robots. Due to the limitations of wireless connections and the complexity of rescue operations, the full operati...

‎A gyrogroup is a nonassociative group-like structure modelled on the ‎space of relativistically admissible velocities with a binary ‎operation given by Einstein's velocity addition law‎. ‎In this ‎article‎, ‎we present a few of groups sitting inside a gyrogroup G‎, ‎including the commutator subgyrogroup‎, ‎the left nucleus‎, ‎and the ‎radical of G‎. ‎The normal closure of the commutator subgyr...

In this paper, we consider the hidden subgroup problem (HSP) over the class of semi-direct product groups Zpr ⋊ Zq, for p and q prime. We first present a classification of these groups in five classes. Then, we describe a polynomial-time quantum algorithm solving the HSP over all the groups of one of these classes: the groups of the form Zpr ⋊ Zp, where p is an odd prime. Our algorithm works ev...

Upon reading the detailed summary of the meeting held at the AOC on June 26th, it has become apparent that several very important compromises to the existing VLA operation are believed to be necessary in order to enhance the low frequency performance of the array. The implementation of the low frequency prime focus system would certainly result in such operational concessions. However, there is...

We propose a functorial concurrent semantics for Petri nets extended with read and inhibitor arcs, that we call inhibitor nets. Along the lines of the seminal work of Winskel on safe nets, the truly concurrent semantics is given at a categorical level via a chain of functors leading from the category SW-IN of semi-weighted inhibitor nets to the category Dom of finitary prime algebraic domains. ...

Although WWW browsers such as Netscape already offer some support for operation under low bandwidth connections, this is still unsuited for mobile environments. In contrast to fixed networks, here connection time is usually expensive and thus clients cannot afford long sessions. MobiScape uses the proxy interface present on modern navigation tools. It intercepts the HTTP data flow, compresses i...