1. A protein was demonstrated in mammalian islets of Langerhans that after purification appeared as a single component possessing both cyclic-AMP (adenosine 3':5'-cyclic monophosphate)-binding and cyclic-AMP-dependent protein phosphokinase activities. 2. The protein had an intrinsic association constant for cyclic AMP of 1.15x10(-8)m, which was similar to the K(m) for cyclic AMP (1.11x10(-8)m) ...

The distribution of protein kinases activated specifically by low concentrations of guanosine 3’,5’-monophosphate (cyclic GMP) or adenosine 3’,5’-monophosphate (cyclic AMP) in various tissues and species of Arthropoda was studied. The Arthropoda were found to represent a rich source of cyclic GMP-dependent protein kinases. The relative levels of cyclic GMP-dependent and cyclic AMP-dependent pro...

We derive a general result concerning cyclic orderings of the elements of a matroid. As corollaries we obtain two further results. The first corollary proves a conjecture of Gonçalves [7], stating that the circular arboricity of a matroid is equal to its fractional arboricity. This generalises a well-known result from Nash-Williams on covering graphs by spanning trees, and a result from Edmonds...

Cyclic arcs (defined by Storme and Van Maldghem, [1994]) and pseudocyclic MDS codes are equivalent objects. We survey known results on the existence of cyclic arcs. Some new results on cyclic arcs in PG(2, q) are also given.

background : nonmyeloablative chemotherapy followed by adoptive immunotherapy is an attractive strategy for depleting regulatory t cells in the host. however, its efficacy is transient. here, we aim to investigate whether cyclic chemoim- munotherapy has therapeutic efficacy against cancer. methods :we examined the efficacy of cyclic chemoimmunotherapy with cyclophos- phamide and adoptively tran...

Cyclic guanosine 3’,5’-monophosphate (cyclic GMP) levels were determined in dog thyroid slices using the protein-binding method. [aH]Guanine incorporation into cyclic GMP was also determined by thin layer chromatography. Basal levels of cyclic GMP in dog thyroid slices were usually 10 to 30 pmoles per g wet tissue. These values were at least lo-fold lower than the cyclic adenosine 3’,5’-monopho...

We prove that cyclic languages are the boolean closure of languages called strongly cyclic languages. The result is used to give another proof of the rationality of the zeta function of rational cyclic languages.

We completely characterize possible indices of quasi-cyclic subcodes in a cyclic code for a very broad class of cyclic codes. We present enumeration results for quasi-cyclic subcodes of a fixed index and show that the problem of enumeration is equivalent to enumeration of certain vector subspaces in finite fields. In particular, we present enumeration results for quasi-cyclic subcodes of the si...

For more than four decades, the cyclic nucleotides cyclic AMP (cAMP) and cyclic GMP (cGMP) have been recognized as important signaling molecules within cells. Under normal physiological conditions, cyclic nucleotides regulate a myriad of biological processes such as cell growth and adhesion, energy homeostasis, neuronal signaling, and muscle relaxation. In addition, altered cyclic nucleotide si...

In this paper, we study the structure of cyclic, quasi cyclic, constacyclic codes and their skew codes over the finite ring R. The Gray images of cyclic, quasi cyclic, skew cyclic, skew quasi cyclic and skew constacyclic codes over R are obtained. A necessary and sufficient condition for cyclic (negacyclic) codes over R that contains its dual has been given. The parameters of quantum error corr...