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Morphology of Pegolettia baccharidifolia (A) and P. retrofracta (B), showing the leaves, flower heads and growth form (habit). Photographs: B.–E. van Wyk.
Source publication
The essential oils obtained by hydrodistillation from Pegolettia baccharidifolia Less. and P. retrofracta (Thunb.) Kies were studied for the first time, using GC/MS and GC/FID techniques. A total of 178 components were identified, representing between 85.3% and 100.0% of the total oils. Some differences were observed in the composition of the essen...
Context in source publication
Context 1
... feature and surface appearance of their leaves. The former species can easily be distinguished by the glossy leaf surface se- cretions (hence the vernacular name heuningdou or "honeydew") and the conspicuously dentate leaf margins. P. retrofracta has dull green leaves with a glandular rather than glossy appearance and the margins are entire (Fig. 1). If attention is paid to these diagnostic characters then the two species are unlikely to be ...
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Citations
... [25,26], Origanum tyttanthum [27], and Satureja intermedia [28]. Although the distribution of thymol in the Asteraceae is limited [29], several members of the family have shown relatively high concentrations of thymol in their essential oils, including, for example, Phagnalon sordidum (1.3-11.0%) [30], Tanacetum sinaicum (17.0-18.7%) ...
Abstract: Sustainability has gained prominence as a discipline for academics and professional practitioners. This article presents a bibliographic account and related analysis of research in sustainability between 1990 and 2019. A critical study of different aspects of sustainability requires a multi/interdisciplinary systems approach. Such a study may encompass ecological, economical, and sociological perspectives. For this reason, the bibliometric analysis has covered a wide range of professional disciplines.
183,779 bibliographic entries from SCOPUS were analysed with latent Dirichlet allocation (LDA) to discover different aspects of publications in sustainability. The study showed that all publications can be classified according to 25 topics, showing how sustainability research has evolved and the consequent gaps that need to be filled for the advancement of the research and community of practice. The LDA analysis resulted in creating a topic model that facilitates the automated categorisation of publications regarding sustainability.
Keywords: sustainability; systematic literature survey; text analytics; latent Dirichlet allocation; LDA; topic model; bibliographic analysis.
Sustainability has gained prominence as a discipline for academicsand professional practitioners. This article presents a bibliographic accountand related analysis of research in sustainability between 1990 and 2019. A critical study of different aspects of sustainability requires a multi/interdisciplinary systems approach. Such a study may encompassecological, economical, and sociological perspectives. For this reason, the bibliometric analysis has covered a wide range of professional disciplines.183,779 bibliographic entries from SCOPUS were analysed with latent Dirichlet allocation (LDA) to discover different aspects of publications insustainability. The study showed that all publications can be classified according to 25 topics, showing how sustainability research has evolved andthe consequent gaps that need to be filled for the advancement of the research and community of practice. The LDA analysis resulted in creating a topic-model that facilitates the automated categorisation of publications regarding sustainability