Recently, Maschietti [6] constructed several families of (2m− 1, 2m−1− 1, 2m−2− 1) cyclic difference sets from monomial hyperovals. In this correspondence, we consider the binary sequences associated to the difference sets constructed by Maschietti. We give algebraic proof of the fact that these sequences have two-level autocorrelation functions, also we discuss the linear spans of these sequen...

Let B(2m,m) be the set of all bicyclic graphs on 2m(m ≥ 2) vertices with perfect matchings. In this paper, we characterize the bicyclic graphs with minimal number of matchings and maximal number of independent sets in B(2m,m). 2010 Mathematics Subject Classification: 05C69, 05C05

The Daudi cell line is a B-lymphoblastoid line derived from a Burkitt lymphoma. Daudi cells lack cell surface expression of class I HLA molecules despite the presence of intracellular class I heavy chains. They have a defect in the gene encoding beta 2-microglobulin (beta 2m), resulting in lack of translatable mRNA for this protein. It has been thought that this deficiency is responsible for th...

OBJECTIVE Neutrophil elastase accounts for the ability of some fresh rheumatoid synovial fluids to degrade cartilage matrix in vitro. The aim of this study was to determine if enzyme activity could result from depletion of synovial fluid inhibitors or protection of the enzyme from inhibition. METHODS The ability of synovial fluids to inhibit porcine pancreatic elastase was investigated togeth...

A snake-in-the-box code (or snake) of word length n is a simple circuit in an n-dimensional cube Qn , with the additional property that any two non-neighboring words in the circuit differ in at least two positions. To construct such snakes a straightforward, non-recursive method is developed based on special linear codes with minimum distance 4. An extension of this method is used for the const...

*Correspondence: [email protected] Department of Mathematics, Nevşehir Hacı Bektaş Veli University, Nevşehir, Turkey 1 Correction In the publication of this article [1], there are a few errors. (1) Page 4, line 4: The statement 1 (ab)m+1 [α 2m+1 + β2m+1 – (–1)m] – 2 should instead read: 1 (ab)m+1 [α 2m+1 + β2m+1] + (–1)m – 2. (2) Page 4, line 6: The statement ( 1 a )lmlm+1 = 1 (ab)m+1 [α ...

Class I major histocompatibility complex molecules require both beta 2-microglobulin (beta 2m) and peptide for efficient intracellular transport. With the exception of H-2Db and Ld, class I heavy chains have not been detectable at the surface of cells lacking beta 2m. We show that properly conformed class I heavy chains can be detected in a terminally glycosylated form indicative of cell surfac...

In this paper, we establish the following result. Theorem: Ai, the number of codewords of weight i in the secondorder binary Reed-Muller code of length 2m, is given by Ai = 0 unless i = 2m-1 or 2m-1 f 2m+-i, for some j, 0 < j < [m/2], A0 = A2m =l,and Azmj(f+l) (2” 1>(2+l 1) 1*zsn-,-i = 2 1 4-l I ‘(2m-2 i 1)(2”-3 1) . 42 1 . . . 1 (2m-2i+2 _ 1)(2m-Zi+l _ 1) . 1 4’ 1 I , 1 I j I [M4 INTRODUCTION ...

T etraphenylphosphonium tetrathiom etalates, (PPh4)^MS4 (M = M o, W), react with M oO ,(acac)2 (2:1) in boiling acetonitrile in redox processes to give mixed-crystal com pounds (as expected) o f the approxim ate com position (P P h ^ M o ^ O , 9Sg,] (1) and (PPh4)2[Moj 4W, 60 , 3Sg 3] (2), respectively. 1 and 2 were characterized by single crystal X-ray structure analyses. The various anions o ...