1,720,991 research outputs found
Antileishmanial activity of euplotin C, the sesquiterpene taxonomic marker from maine ciliate Euplotes crassus
No full textAntimicrobial activity of euplotin C, the sesquiterpene taxonomic marker from the marine ciliate Euplotes crassus
No full textInvestigation of chemical and biological properties od euplotin C and its inclusion complex with cyclodextrins
No full textNew terpenoids from protista cell cultures: towards an understanding of their biogenesis
No full textLiquid chromatography – tandem mass spectrometry tecnique : a powerful tool for fast and effective dereplication of protista’s secondary metabolites
No full textA Phylogenetic Perspective of the Secondary Metabolites from Marine Ciliates: a Comparison with rDNA and Multivariate Morphological Analysis
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The hydrolytic route to Co-porphyrin-doped SnO2 gas-sensing materials. Chemical study of Co-porphyrin versus Sn(IV) oxide interactions
No full textSnO2 and SnO2 + Co-porphyrin solids were prepared from SnCl4 in propanol and hydrolyzed to sol. Thermal behavior of samples obtained at 110 degrees C was studied in the 20-600 degrees C interval by thermal analysis coupled with mass spectrometry for identification of released species. The original samples maintain residual Sn-OR, Sn-OH and Sn-Cl groups up to 350 degrees C. The sample doped with 1% Co-porphyrin differs for a significant presence of residual Sn-Cl species, accounting for SnCl4 release in the 300-340 degrees C range. Sn-119 solid state NMR analysis reveals disordered SnO2 species in the sample heated at 250 degrees C and non-uniform SnO6 units in the SnO2 + Co-porphyrin sample at 110 degrees C, due to persistence of Sn-OR and Sn-OH groups. This complexity is lost at 250 degrees C. X-ray diffraction analysis confirms all these data. The sensing efficiency of these materials versus alcohols is ascribed to the presence of an open, incomplete SnO2 structure, which is more pronounced in the Co-porphyrin-doped sample. (c) 2007 Elsevier B.V. All rights reserved
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