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Cyanolipid-rich seed oils from Allophylus natalensis and A. dregeanus
No full textAs a continuation of our study on plants of the Sapindaceae, the chemical composition of the oil extracted from seeds of Allophylus natalensis (Sonder) De Winter and of A. dregeanus (Sonder) De Winter has been investigated. The oil from both species contained approximately equal amounts of TAG and type I cyanolipids (CL), 1-cyano-2-hydroxymethylprop-2-en-1-ol-diesters, with minor amounts of type III CL, 1-cyano-2-hydroxymethylprop-2-en-1-ol-diesters. Structural investigation of the oil components was accomplished by chemical, chromatographic (TLC, CC, GC, and GC-MS), and spectroscopic (IR, NMR) means. GC and GC-MS analysis showed that C-20 FA were dominant in the CL components of the oil from the two species (44-80% vs. 21-26% in TAG), with cis-11-eicosenoic acid (36-46%) and cis 13-eicosenoic acid (paullinic acid, 23-37%) as the major esterified fatty acyl chains in A. natalensis and A. dregeanus, respectively. cis-Vaccenic acid was particularly abundant (11-31%) in the CL from A. dregeanus, whereas eicosanoic acid (10-22%) was also a major component of CL in both species
Characterization of seed oil components from Nephelium lappaceum L
No full textThe chemical composition of the oil extracted from the seeds of Nephelium lappaceum L., commonly known as rambutan, has been investigated. The oil from this plant, similar to other members of the Sapindaceae, typically contained triglycerides (83%) and cyanolipids (17%). The latter consisted of type III cyanolipids, 1-cyano-2-hydroxymethylprop-1-en-3-ol diesters. Structural investigation of the oil components was carried out using chemical, chromatographic and spectroscopic methods. Oleic and arachidic acids were the two dominant esterified fatty acyl chains in both triglycerides and cyanolipids. Eicosenoic acids (cis-vaccenic and paullinic acid) were present in higher amounts in the cyanolipid fraction of the oil
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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