We study the transition from a silent state to a bursting state by varying the dc stimulus in the Hindmarsh-Rose neuron under quasiperiodic stimulation. For this quasiperiodically forced case, a new type of strange nonchaotic (SN) bursting state is found to occur between the silent state and the chaotic bursting state. This is in contrast to the periodically forced case where the silent state t...

The title compound, [Sn(2)(CH(3)O)(2)Cl(6)(C(3)H(7)NO)(2)], contains two hexa-coordinated Sn(IV) atoms symmetrically bridged by two deprotonated methanol ligands, with an inversion center in the middle of the planar Sn(2)O(2) ring. The other sites of the distorted octa-hedral coordination geometry of the Sn(IV) atom are occupied by three Cl atoms and one O atom from a dimethyl-formamide mol-ecu...

In the title complex, [Sn(CH3)2(C18H11ClN2O2)], the Sn(IV) ion is coordinated by two O atoms and an N atom from a 4-chloro-N'-[(2-oxidonaphthalen-1-yl)methyl-idene]benzohydrazidate ligand and two C atoms from two methyl ligands in a distorted trigonal-bipyramidal geometry [Sn-O = 2.092 (3) and 2.144 (3) Å; Sn-N = 2.160 (4) Å]. The dihedral angle between the naphthalene ring system and the benze...

We establish some identities relating two sequences that are, as explained, related to the Tribonacci sequence. One of these sequences bears the same resemblance to the Tribonacci sequence as the Lucas sequence does to the Fibonacci sequence. Defining a matrix that we call Tribomatrix, which extends the Fibonacci matrix, we see that the other sequence is related to the sum of the determinants o...

The title tetra-nuclear complex mol-ecule, [Sn(4)(C(7)H(7))(8)(C(2)H(2)ClO(2))(4)O(2)], has crystallographically imposed inversion symmetry. Each Sn atom has a distorted trigonal-bipyramidal geometry, with the equatorial plane formed by an oxido O atom and two C atoms of two benzyl anions. The configuration of the complex is stabilized by a pair of C-H⋯O hydrogen bonds. In the crystal, complex ...

The present study comprises a cytoarchitectonic analysis of the human substantia nigra (SN) and ventral tegmental area (VTA); a discussion of their chemoarchitecture and fiber connections (mainly based on tract-tracing studies in primates) preceded by an overview of the wealth of tract-tracing data in rodents; a discussion of the involvement of the SN/VTA complex in Parkinson's disease (PD) and...

BACKGROUND The suprascapular notch (SSN), bridged by the superior transverse scapular ligament (STSL), creates a pathway for the suprascapular nerve (SN). Morphological variations in the SSN region are common and can increase the risk of neuropathy by constricting the space for the nerve. The aim of this study was to establish new objective parameters that take this complex morphology into acco...

In the title polymeric coordination compound, [Sn(CH(3))(3)(C(6)H(5)O(2)Se)](n), the Sn(IV) atom has a distorted trigonal-bipyramidal geometry, with two O atoms of two symmetry-related bridging phenyl-seleninate anions in axial positions and three methyl groups in equatorial positions. In the crystal, the complex exhibits a chain structure parallel to the b axis.

The centrosymmetric title compound, [SnI(4)(C(21)H(21)OP)(2)], is a monomeric complex that displays a nearly octa-hedral coordination of tin(IV), with an Sn-O bond distance of 2.159 (2) Å and an average Sn-I bond distance of 2.79 (3) Å.