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The construction of maps of social networks is shown based in the Journal of Documentation during the period 1988-2005. The analysis is made by: (i) authors that produce the most within the publication, (ii) authors with the greatest centrality and…

In this work, a novel parallel manipulator is introduced with the purpose of simulating the jerk analysis of the end of the spine. The displacement analysis is presented in a semi-closed form solution whereas the velocity, acceleration and jerk analyses…

Two natural isocordoin derivatives, dihydroisocordoin (1) and flemistrictin B (2), were isolated from the root extract of Lonchocarpus xuul. Both metabolites were identified on the basis of their spectroscopic data and by comparing them with those reported in the literature.

Blumenol A (1), blumenol B (2) and loliolide (3), together with the ubiquitous β-sitosterol, α-amyrin and β-amyrin, were isolated from the organic extract of the leaves of Heliotropium angiospermum. Structural elucidation of the metabolites was carried out by analysis of…

An efficient diastereoselective Michael addition of the commercial potassium O-ethyl dithiocarbonate to Baylis-Hillman adducts in the presence of 9-BBN (9-borabicyclo[3.3.1]nonane) as a Lewis acid is reported. 9-BBN both protected the hydroxyl group and activated the carbonyl of the Michael acceptor.

A broad diverse test set of alkanes and cycloalkanes previously studied with MM4 calculations has had the heats of formation calculated by several different quantum mechanical methods: Hartree-Fock, MP2, and MP4, and also by B3LYP and B3LYP + dispersion energy.…

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