Single crystals of the title salt, (C(3)H(10)N(3))(2)[Sn(CH(3))(2)(H(2)O)(4)](SO(4))(2), formed concomitantly with the already known [Sn(CH(3))(3)](2)SO(4)·2H(2)O. In the title structure, the Sn(IV) atom displays a slightly distorted octa-hedral coordination geometry defined by four O water atoms in the equatorial positions and two methyl groups in the axial positions. In the crystal, various O...

determined by the matrix A =(a„fc) of real or complex constants, if the transform S» exists and limn^S„ = L. The matrix A (and method of summability A) is called row-finite if for each n, a„k = 0 for all sufficiently great k; and is called triangular if an* = 0 for k>n. The method A is regular if sn—>L implies Sn-*L. Necessary and sufficient conditions that A be regular are, by the Silverman-To...

Two series of new diorganotin(IV) cycloalkylhydroxamate complexes with different ring sizes (cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl), formulated as the mononuclear [R(2)Sn(HL)(2)] (1:2) (a, R=(n)Bu and Ph) and the polymeric [R(2)SnL](n) (1:1) (b, R=(n)Bu) compounds, were prepared and fully characterized. Single crystal X-ray diffraction for [(n)Bu(2)Sn{C(5)H(9)C(O)NHO}(2)] (3a) dis...

Three experiments explored the issue of selective associations in the observational conditioning of fear. Experiment 1 results indicated that observer rhesus monkeys acquired a fear of snakes through watching videotapes of model monkeys behaving fearfully with snakes. In Experiment 2, observers watched edited videotapes that showed models reacting either fearfully to toy snakes and nonfearfully...

We study the limit distribution of zeros of certain sequences of holomorphic sections of high powers L of a positive holomorphic Hermitian line bundle L over a compact complex manifold M . Our first result concerns ‘random’ sequences of sections. Using the natural probability measure on the space of sequences of orthonormal bases {SN j } of H(M,L ), we show that for almost every sequence {SN j ...

In this paper we study complex representations of the factorpower FP(G,M) of a finite group G acting on a finite set M . This includes the finite monoid FP+(Sn), which can be seen as a kind of a “balanced” generalization of the symmetric group Sn inside the semigroup of all binary relations. We describe all irreducible representations of FP(G,M) and relate them to irreducible representations of...

The enriched semantic network (ESN) has previously been presented as an enhancement of the semantic network (SN) of the UMLS. The ESN's hierarchy is a DAG (Directed Acyclic Graph) structure allowing for multiple parents. The ESN is thus more complex than the SN and can be more difficult to view and comprehend. We have previously introduced the notion of a metaschema for the SN as a compact abst...

The synthesis and characterization of the organotin compounds [(n-C(4)H(9))(2)Sn(cys)] (1), [(C(6)H(5))(2)Sn(cys)] (2), [(C(6)H(5))(3)Sn(Hcys).(H(2)o)] (3), {[(CH(3))(2)Sn(Kcys)(2)].2(H(2)0)} (4), {[(n-C(4)H(9))(2)Sn(Kcys)(2)].2(H(2)0)} (5) and {[(C(6)H(5))(2)Sn(Kcys)(2)].2(H(2)0)} (6) (where H(2)cys = L-cysteine) are reported. The compounds have been characterized by elemental analysis and (1)...

Molecular turnstiles, based on a hinge composed of a Sn-porphyrin bearing coordinating sites at the meso positions and a handle, equipped with a tridentate coordinating pole or its Pd(ii) complex, connected to the porphyrin through Sn-O bonds, offering open (free rotation of the handle around the hinge) and close states (blockage of rotation through binding of Pd(ii)) were designed, prepared an...

The asymmetric unit of the title complex, [Sn(4)(C(4)H(9))(8)(C(11)H(14)NO(2))(4)O(2)], consists of two crystallographically independent half-mol-ecules. The other halves are generated by crystallographic inversion centers. In each tetra-nuclear mol-ecule, both of the two independent Sn atoms are five-coordinated, with distorted trigonal-bipyramidal SnC(2)O(3) geometries. One Sn atom is coordin...