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Pelargonium tomentosum: A potential source of peppermint-scented essential oil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F.-E. Demarne --- , France J. J.A. van der Walt --- Department of Botany, Republic of South AfricaA synopsis of the nomenclature and morphological features of Pelargonium tomentosum Jacq. (2n=44) is presented. The structure of the trichomes is described in detail and the composition of the essential oil is tabulated. The main components of the essential oil... -
The effect of clone type and method of transportation on oil yield from vegetative material of Eriocephalus punctulatus
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.N. Webber --- Department of Livestock and Pasture Science, Republic of South Africa M.L. Magwa --- Electron Microscope Unit, J. van Staden --- Department of Botany, University of Natal Pietermaritzburg, Republic of South AfricaEriocephalus punctulatus, also known as, ‘Kapok Bos’, belongs to the Asteraceae family. It is an attractively scented woody shrub, that reaches a height of about one metre. It produces a highly priced essential oil with a dark blue colour and... -
Morphology and ultrastructure of glandular and nonglandular trichomes on the leaves of Athrixia phylicoides (Asteraceae)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Möller --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, E.S. du Toit --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, P. Soundy --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, J. Olivier --- Department of Environmental Sciences,Athrixia phylicoides is one of many plants from the Asteraceae family used as a traditional herbal medicine. Pharmacological evaluation of leaf extracts confirmed that the plant has anti-inflammatory, antihypertensive, narcotic and analgesic properties. The medicinal properties of plants are often... -
Effect of pH on growth, mineral content and essential oil quality of buchu (Agathosma betulina) grown under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Babalwa Ntwana --- Department of Agronomy, South Africa G André Agenbag --- Department of Agronomy, South Africa Petrus Langenhoven --- , South AfricaBuchu (Agathosma betulina) is a traditional medicinal plant in the Western Cape province of South Africa and the essential oil derived from the leaves is exported in large volumes. The essential oil is not only used for medicinal purposes, but... -
Perceived Challenges in the Self-Management of Essential Hypertension in South African Settings
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karel F.H. Botha --- North-West University, Wynand F. du Plessis --- North-West University,The study investigated the subjective experiences of Essential Hypertension (EH) in a sample of urban white Afrikaans-speaking (n=25) and black Sotho-speaking (n=25) patients. Measures of self-management were obtained and their subjective experience of EH and its self-management was explored during... -
A note on * μ -rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. France-Jackson H.J. Le RouxWe introduce and investigate the concept of * μ -rings which is a generalization of *-rings defined and studied in [4], [5], [6], [7] and [10]. This lets us generalize many important results valid for *-rings and obtain a useful... -
On *-Essential Ideals and Biideals of Rings with Involution
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D.I.C. MendesLet R be a ring with involution *. We describe the structure of R, when R has no proper *-essential *-ideals (*-biideals) and also when R has a *-essential minimal *-biideal. -
On rings generating supernilpotent and special atoms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. France-Jackson N.J. GroenewaldWe study prime rings which generate supernilpotent (respectively special) atoms, that is, atoms of the lattice of all supernilpotent (respectively special) radicals. A prime ring A is called a **-ring if the smallest special class containing A is closed under... -
(Φ, M)–extensions of near-rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mark FaragIn this paper, we define and study a generalization of matrix, polynomial, and group near-rings. New results on ideal essentiality and lying over are obtained. -
On Inessential Elements in Different Banach Algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D. Behrendt H. RaubenheimerIf B is a subalgebra of a Banach algebra A we consider the problem of determining conditions that ensure that an element of B that exhibits a property in B also exhibits this property when viewed as an element of... -
Potential cost savings from generic medicines—protecting the Prescribed Minimum Benefits
Item type: Journal Article • Journal: South African Family Practice • Authors: E Nicolosi --- Department of Therapeutics and Medicines Management, A Gray --- Department of Therapeutics and Medicines Management,Background: South Africa has followed a pro-generic policy since the introduction of the National Drug Policy in 1996. The selection processes in the public and private sectors have, however, remained largely disconnected, and at times contradictory. Medicines provided outside of... -
Primary health eye care: evaluation of the competence of medical students in performing fundoscopy with the direct ophthalmoscope
Item type: Journal Article • Journal: South African Family Practice • Authors: JS Van Velden --- Division of Ophthalmology, South Africa C Cook --- Division of Ophthalmology, South Africa Du Toit N --- Division of Ophthalmology, South Africa L Myer --- School of Public and Family Medicine, University of Cape Town, South AfricaBackground: To evaluate the skill of fifth-year medical students at the University of Cape Town in the performance of fundoscopy at the end of their ophthalmology rotation. -
Exploring a regional pharmaceutical innovation network as a possible solution to the market failure in the innovation of essential medicines for tropical diseases in sub-Saharan Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Thaddeus Manu --- Centre for Commercial Law Studies, UKFrom an economic reasoning perspective, pharmaceutical research and development operates as a pure market activity. This viewpoint suggests innovations are receptive to questions of commerce. It is on this basis the pharmaceutical industry has undervalued the innovation of medicines for... -
Introduction to Anthropology Southern Africa, special edition on ‘Debating Southern African Anthropology’
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Kees (C. S.) van der Waal --- Department of Sociology and Social Anthropology, South Africa Vivienne Ward --- Department of Sociology and Social Anthropology, South AfricaBy challenging anthropologists practising in different southern African contexts to engage in debate, we elicited a rich array of viewpoints and counter-challenges as we gathered articles for this special edition. In this introductory article we set the scene for the... -
Primordialist paranoia, essentialism and South African realities: participating and observing across the ‘anthropological divide’
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Michael de Jongh --- Department of Anthropology and Archaeology,This article interrogates the exigency of some of the current concerns of South African anthropology. The contribution is autobiographical and occasionally anecdotal; personal narrative hence shapes the mode of text development. In considering the current state of the South African... -
Claiming Cape Town: towards a symbolic interpretation of Khoisan activism and land claims
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Rafael Verbuyst --- African Studies Centre Leiden, The NetherlandsCurrent political negotiations in South Africa which explore the possibility of pre-1913 land claims and the recognition of Khoisan traditional authorities have spurred the growth of the “Khoisan revival”: the phenomenon of people identifying as Khoisan and asserting indigenous rights... -
Effect Of Replacing Fish Meal With Blood Meal On Chemical Composition Of Supplement For Nile Tilapia (Oreochromis Niloticus)
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J. G. Kirimi --- State Department of Fisheries, Kenya L. M. Musalia --- Department of Animal Sciences, Kenya J. M. Munguti --- Kenya Marine and Fisheries Research Institute (KMFRI)-Sagana, KenyaThe objective of the work was to evaluate the effect on the nutrient content of replacing fish meal (FM) with blood meal (BM) in fish supplement. Three isonitrogenous diets (35% crude protein) were formulated using FM as the main source... -
More than eating dirt: a review of avian geophagy
Item type: Journal Article • Journal: African Zoology • Authors: Colleen T Downs --- School of Life Sciences, South Africa Ian P Bredin --- School of Life Sciences, South Africa Peter D Wragg --- School of Life Sciences, South AfricaGeophagy, the ingestion of earth varying in particle size from stones to soils rich in clay, is a relatively widespread behaviour across avian taxa. We reviewed its occurrence in birds and its hypothesised adaptive functions in birds. Of the ∼30... -
Seasonal changes of copper and zinc concentrations in browse saltbush (Atriplex canescens (Pursh) Nutt.) from the Algerian arid rangelands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Bouzid Nedjimi --- , AlgeriaThe study aimed to elucidating the seasonal variations of copper (Cu2+) and zinc (Zn2+) contents occurring in Atriplex canescens shrubs, as well as in surrounding soil. Cu and Zn concentrations were determined using X-ray fluorescence (XRF) spectrometry. Data were compared... -
Britain and Brexit: imagining an essentialist sense of “Britishness” and navigating amongst “the British”
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Nigel Rapport --- , United KingdomIn his analysis of the 1956 Hungarian uprising against Soviet control, Georges Devereux argued that social movements exist not because members exhibit attitudinal uniformity but because in the “same” collective act individuals serendipitously find a socially acceptable expression for their... -
Sheep, herbs and blood on the beach: discrepant representations of ritual acts for essentialising and reinforcing difference in contemporary South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Andrew D. Spiegel --- , South AfricaSouth Africa’s 2018/2019 summer holidays were marked by a flurry of media reports describing, some in vivid, graphic detail, the ritual slaughter of a sheep on a popular Cape Town beach by a group of #MustFall activists. Their action was... -
Essentialism in Zoroastrian boundary construction
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Paulina Niechciał --- , PolandThe article explores tensions in contemporary Zoroastrianism, one of the world’s oldest practiced religions, over who a “real” Zoroastrian is, what, for Zoroastrians, constitutes the essence of Zoroastrianism and how constructed collective boundaries may or may not be crossed. Considering... -
Persistent essentialism in Polish nationalist discourse: a Wittgensteinian critique
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Witold Jacorzynski --- , MexicoEssentialism, an erroneous way of thinking that can be traced to classical philosophy, assumes a thing to hold necessary intrinsic characteristics. Such thinking has been commonly employed for a popular understanding of bounded groups of people, establishing imaginary communities and... -
The allure of essentialism and extremist ideologies
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Jonatan Kurzwelly --- , South Africa Hamid Fernana --- , South Africa Muhammad Elvis Ngum --- , South AfricaThis paper examines different reasons that make essentialist thinking, and by extension extremist ideologies based on such logic, attractive to individuals. Drawing from theories of personal and social identities, we examine the benefits derived from adopting an essentialist and reductionist... -
Living excluded from the world: essentialism in development discourse and its percolation into Santomean self-perceptions
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Nicola Soekoe --- , South AfricaUsing an analysis of development discourse in and about São Tomé and Príncipe (STP), this article aims to trace the relationship between sociocultural constructions of difference and socio-economic structures of exclusion in the global development project. Using ethnographic data from... -
Singing about the dark times in the US and India: notes on situated understandings in our age of essentialisms
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Chandana Mathur --- , IrelandIn an age where essentialisms and reductionisms appear to drive the politics of hate in most parts of the world, this essay seeks to explore the insight, hope and room for manoeuvre offered by situated local knowledges. Counterposing the “white... -
Encountering, explaining and refuting essentialism
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Jonatan Kurzwelly --- , South Africa Nigel Rapport --- , United Kingdom Andrew D. Spiegel --- , South AfricaEssentialism manifests itself in a diversity of forms and is used in multiple ways. Yet it is always potentially dangerous — even when it is mobilised strategically and in apparently worthy forms for purposes of overcoming oppressive structures. As the... -
On minimum proper essential extensions in a category
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anthony W. Hager --- Wesleyan University, USA Brian Wynne --- Lehman College, CUNY, USAIn a concrete category A satisfying certain natural conditions, we investigate minimum proper essential extenstions (A-mpee’s) and how this relates to atoms in the complete lattice hoA of hull operators on A (if A # is the category with... -
On the largest regular subring of C(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Adelzadeh --- Shahid Chamran University of ahvaz, Iran F. Azarpanah --- Shahid Chamran University of ahvaz, Iran R. Mohamadian --- Shahid Chamran University of ahvaz, IranWe call a real-valued function f on a topological space X a locally constant if each point x ∈ X has a neighborhood on which f is constant. The set of all locally constant functions f: X → ℝ is... -
Discrete selectivity, shrinking properties, and disjoint local π-bases
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gary Gruenhage --- Auburn University, U.S.A Vladimir V. Tkachuk --- Universidad Autónoma Metropolitana, MexicoUsing binary function spaces, we give an example of a pseudocompact discretely selective topological group. We show that, under PFA, every compact space of countable tightness has a countable disjoint local π-base at every point. If X is a compact... -
“Feeling their way through their cultural roots”: theorising the Khoisan revivalist critique of authenticity from below
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Rafael Verbuyst --- University of Gent, BelgiumAuthenticity is a longstanding concern in Khoisan Studies. Most scholarship has examined how stereotypical, essentialist and static notions of “authentic” Khoisan identity and culture are habitually reproduced and demanded of the Khoisan for economic or political gain. Recent work instead... -
On quotient rings of pointfree function rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Batsile Tlharesakgosi --- University of South Africa, South Africa Sharon Nyokabi Wamugunda --- University of South Africa, South AfricaLet L be a completely regular frame. Associated with each I ∈ βL are two ideals, MI and OI , of the ring of real-valued continuous functions on a frame L. In this paper, we describe the intersection of all...