We describe a new repressible binary expression system based on the regulatory genes from the Neurospora qa gene cluster. This "Q system" offers attractive features for transgene expression in Drosophila and mammalian cells: low basal expression in the absence of the transcriptional activator QF, high QF-induced expression, and QF repression by its repressor QS. Additionally, feeding flies quin...

In the third paragraph of my paper Generalizations of the Bernoulli polynomials and numbers and corresponding summation formulas, published in this Bulletin, vol. 48 (1942), pp. 567-574, no explicit statement is made of the fact that it is assumed that P and Q as operators on x obey the laws: PF(x+c) ]c=0 = PF(x) ; QF(x+c)]c=0 = QF(x). Also the statement ƒ„(()) = 0, should read fn(0) = 0, n>0.

The formation of a di-nuclear system (DNS) during the capture stage of two heavy nuclei can be regarded as the first step of a fusion process. However, with increasing Z of the reaction partners also their Coulomb repulsion is increasing. This can lead to the decay of the DNS before a compound nucleus is formed (quasi-fission (QF)). The velocity filter SHIP enables a background free identificat...

We present a constructive procedure for extracting polynomial-time realizers from ineffective proofs of Π2theorems in feasible analysis. By ineffective proof we mean a proof which involves the non-computational principle weak König’s lemma WKL, and by feasible analysis we mean Cook and Urquhart’s system CPV plus quantifierfree choice QF-AC. We shall also discuss the relation between the system ...

Bit-precise reasoning is essential in many applications of Satisfiability Modulo Theories (SMT). In recent years, efficient approaches for solving fixed-size bit-vector formulas have been developed. Most of these approaches rely on bit-blasting. In [1], we argued that bit-blasting is not polynomial in general, and then showed that solving quantifier-free bit-vector formulas (QF BV) is NExpTime-...

This paper considers a sequential search model for a target which moves among three boxes according to a moving structure characterized by a Markov transition matrix known to the searcher. We want to derive the search policy which minimizes the expected number Qf looks needed to detect the target. We shall deal with the model for the perfect detection case only. We derive some general propertie...