• This review examines critically the evidence bearing on the hypothesis that the positive inotropic effects of catecholamines are mediated by intracellular cyclic adenosine monophosphate (cyclic AMP). The review is selective in several respects. For example, it does not contain extensive discussions about the biochemical actions of cyclic AMP, the enzymes regulating its synthesis and degradati...

The cyclic ordering problem is to recognize whether a collection of cyclically ordered triples of elements of a set T is derived from an arrangement of all the elements of T on a circle. This problem is shown to be NP-complete. A cyclic ordering of a set T = {l,. ., t ) is essentially an arrangement of the elements of T on a circle. A specific definition is as follows (see [4]). Two linear orde...

The compensatory growth, proximate composition and amino acid contents changes of young yellow catfish (Pelteobagrus fulvidraco R.) (1.63-1.69 g) had been investigated using a 45-day cyclic feed deprivation and re-feeding experiment. The control group (S0) was fed daily with live tubificid worms (Limnodrilus hoffmeisteri), while the S1/4, S1/2, and S1/1 groups cyclically experienced one-day of ...

Cyclic di-GMP is a novel second messenger in bacteria that was first described as an allosteric activator of cellulose synthase in Gluconacetobacter xylinus. It is now established that this nucleotide regulates a range of functions including developmental transitions, aggregative behavior, adhesion, biofilm formation and virulence in diverse bacteria. The level of cyclic di-GMP in bacterial cel...

density functional (dft) calculations at m05-2x/aug-cc-pvdz level were used to analyze the interactions between dimethyl sulfoxide (dmso) dimers. the structures obtained have been analyzed with the atoms in molecules (aims) and natural bond orbital (nbo) methodologies. four minima were located on the potential energy surface of the dimers. three types of interactions are observed, ch•••o, ch•••...

Cells of Dictyostelium discoideum respond to extracellular cyclic AMP with marked changes in intracellular cyclic GMP levels and light scattering. In this work, defined temporal increases in cyclic AMP were produced by the continuous addition of cyclic AMP to agitated suspensions of cells; concomitant hydrolysis of cyclic AMP by the cells subsequently established a constant, steady state concen...

We show that every p-fold strictly-cyclic branched covering of a b-bridge link in S 3 admits a p-symmetric Heegaard splitting of genus g = (b − 1)(p − 1). This gives a complete converse to a result of Bir-man and Hilden, and gives an intrinsic characterization of p-symmetric Heegaard splittings as p-fold strictly-cyclic branched coverings of links.

a detailed analysis of the electron-impact-induced fragmentation of 5,8dithiaspiro (3.1) octane and s,9-dithiaspiro 6.5) nonane is presented. the tetradeuteri6-analog of the cyclic dithioketals is prepared as an aid in analysing the fragmentation patterns. it was readily seen that the nature of the fragmentation pathway was governed by the size of the ring containing the two sulfur atoms and th...

expansive soils show swelling and shrinkage behavior when subjected to cyclic wetting and drying. the variation in water content influence the volume change in this kind of soil. these volume changes can cause ground movement which may result in damage to the buildings and structures. to study the behavior, a number of successive wetting-drying cycles were conducted on a statically compacted ex...

We show that every p-fold strictly-cyclic branched covering of a b-bridge link in S 3 admits a p-symmetric Heegaard splitting of genus g = (b−1)(p−1). This gives a complete converse to a result of Birman and Hilden, and gives an intrinsic characterization of p-symmetric Hee-gaard splittings as p-fold strictly-cyclic branched coverings of links.