We present bijections between four classes of combinatorial objects. Two of them, the class of unlabeled (2 + 2)-free posets and a certain class of involutions (or chord diagrams), already appeared in the literature, but were apparently not known to be equinumerous. We present a direct bijection between them. The third class is a family of permutations defined in terms of a new type of pattern....

background: crimean congo hemorrhagic fever virus (cchfv) is a member of the bunyaviridae family and nairovirus genus. it has a negative-sense, single stranded rna genome approximately 19.2 kb, containing the small, medium, and large segments. cchfvs are relatively divergent in their genome sequence and grouped in seven distinct clades based on s-segment sequence analysis and six clades based o...

Human telomeric DNA consists of tandem repeats of the DNA sequence d(GGGTTA). Oligodeoxynucleotide telomere models such as d[A(GGGTTA)(3)GGG] (Tel22) fold in a cation-dependent manner into quadruplex structures consisting of stacked G-quartets linked by d(TTA) loops. NMR has shown that in Na(+) solutions Tel22 forms a "basket" topology of four antiparallel strands; in contrast, Tel22 in K(+) so...

The sequence of 5,839 nucleotides from the adenovirus 2 genome has been determined and includes the regions between coordinates 32-44% and 66-71%. These regions contain the coding sequences for the 52,55K polypeptide, polypeptide IIIa, penton base, and the N terminus of the 100K polypeptide. Several additional unidentified open reading frames are present, including examples which overlap identi...

The complete genome of the English isolate of rat cytomegalovirus (RCMV-E) was determined. RCMV-E has a 202,946-bp genome with noninverting repeats but without terminal repeats. Thus, it differs significantly in size and genomic arrangement from closely related rodent cytomegaloviruses (CMVs). To account for the differences between the rat CMV isolates of Maastricht and England, RCMV-E was clas...

The complete mitochondrial DNA (mtDNA) control region was cloned and sequenced in the musk shrew, Suncus murinus, Insectivora. The general aspect was similar to that found in other mammals. We have found in two locations of this region the presence of arrays of tandem repeats like those in other shrew species. One array was located in the left domain containing the termination-associated sequen...

n = b + a, a ≤ b, a, b ∈ A. n = b + a, a < b, a, b ∈ A. n = b− a, a < b, a, b ∈ A. We say that a sequence of integers A belongs to the class of B2[g] sequences if r(n) ≤ g for any integer n. To find B2[g] sequences as dense as possible is a standard problem in additive number theory ([2],[5],[6],[7]). We define F (N, g) = max{|A|, A ⊂ [1, N ], A ∈ B2[g]}. One is interested in finding precise bo...

F. Gottardo, J. Mir , G.Parladori Advanced Technologies Laboratory via Trento, 30 I-20059 Vimercate (MI), Italy G. L. Sicuranza D.E.E.I., University of Trieste via A. Valerio 10 I-34127 Trieste, Italy ABSTRACT In this paper a new block-based technique for image preltering is proposed, in order to overcome some limits of the MPEG{2 encoding process at low bitrates. The presented scheme performs ...

This paper contains some contributions to the study of the relationship between 2-categories and the homotopy types of their classifying spaces. Mainly, generalizations are given of both Quillen’s Theorem B and Thomason’s Homotopy Colimit Theorem to 2-functors. Mathematical Subject Classification: 18D05, 55P15, 18F25.