Robert J. McKenzie

ORCID: 0000-0001-7054-3308
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About
Contact & Profiles
Research Areas
  • Plant Diversity and Evolution
  • Sesquiterpenes and Asteraceae Studies
  • Botany, Ecology, and Taxonomy Studies
  • Botany and Plant Ecology Studies
  • Biological Control of Invasive Species
  • Plant Taxonomy and Phylogenetics
  • Plant and Fungal Species Descriptions
  • Plant and animal studies
  • Ethnobotanical and Medicinal Plants Studies
  • Archaeology and Rock Art Studies
  • Plant Parasitism and Resistance
  • South African History and Culture
  • Ecology and Vegetation Dynamics Studies
  • Conservation, Biodiversity, and Resource Management
  • Plant Toxicity and Pharmacological Properties
  • Botanical Research and Chemistry
  • Pacific and Southeast Asian Studies
  • Botanical Studies and Applications
  • Natural product bioactivities and synthesis
  • Biochemical and Structural Characterization
  • Plant Ecology and Taxonomy Studies
  • Botanical Research and Applications
  • Polysaccharides and Plant Cell Walls
  • Neuroscience and Neuropharmacology Research
  • Seed and Plant Biochemistry

Rhodes University
2010-2025

University of the Free State
2019-2024

Albany Research Institute
2016

University of Washington
1977-2015

University of Canterbury
2003-2015

Selma University
2012

Swinburne University of Technology
2007

Stockholm University
2006

University of Auckland
1992-1997

Hahnemann University Hospital
1991-1995

BACKGROUND: Depressive symptoms are an independent risk factor for outcome in patients with cardiac disease, but their effect on among undergoing coronary artery bypass grafting is not well understood. OBJECTIVES: To determine whether or clinical variables including length of stay, readmission rates, and mortality related to patients' level depressive before after grafting. METHODS: An observational, longitudinal design was used. The Medical Outcomes Study 36-item short-form health survey...

10.4037/ajcc2001.10.1.4 article EN American Journal of Critical Care 2001-01-01

In South Africa conservation is still largely framed in terms of Western scientific values, with a focus on material benefits to local communities, whilst little known about the intangible values people attach nature and biodiversity. We explored cultural, spiritual emotional relationships expressed by Xhosa people, within Maputaland-Pondoland-Albany Hotspot, as well activities that mediate this relationship. A descriptive research approach was applied document emotions, meanings associated...

10.4102/sajs.v108i5/6.880 article EN cc-by South African Journal of Science 2012-05-03

Summary Pollinators are thought to play a key role in driving incipient speciation within the angiosperms. However, mechanisms underlying floral divergence plants with generalist pollination systems, remains understudied. Brunsvigia gregaria displays significant geographical variation traits and visited by diverse pollinator communities. Because pollinators often shared between populations, we investigated whether specific responsible for them. Three distinct ecotypes were identified, each...

10.1111/nph.20373 article EN cc-by-nc-nd New Phytologist 2025-01-10

Abstract The incidence of colorectal cancer is lower in Polynesian populations the South Pacific than European populations. This difference disease may be, at least partly, related to diet. Dietary fiber believed protect against cancer, and one ways it act by adsorbing mutagens that are carcinogenic. Very little known about chemical composition or ability adsorb these dietary fibers from food plants. In contrast plants, which mostly dicotyledons, plants mainly monocotyledons. We isolated...

10.1080/01635589209514175 article EN Nutrition and Cancer 1992-01-01

The cell-wall histochemistry and anatomy of the corm, petiole leaf blade taro [Colocasia esculenta (L.) Schott], an important South Pacific food plant, are described. results discussed in relation to possible protective action cell walls (dietary fibre) against a range diseases, including colorectal cancer. Cell may protect cancer by adsorbing carcinogens, lignified, suberised, possibly cutinised adsorb hydrophobic carcinogens more than lacking these substances. only cells with lignified...

10.1071/bt9920207 article EN Australian Journal of Botany 1992-01-01

Asteraceae are the largest family in southern Africa. Elucidating its origins and radiation region requires well‐supported species‐level phylogenies of lineages. This paper presents a phylogenetic framework for subtribe Arctotidinae, which have eastern African–Australian distribution centered winter‐rainfall South DNA sequence data from five chloroplast fragments ( ndhF , psbA‐trnH rps16 trnS‐trnfM trnT‐trnF ) nuclear ITS were analyzed separately combination using parsimony Bayesian methods....

10.3732/ajb.93.8.1222 article EN American Journal of Botany 2006-08-01

Abstract Expansion by expansive species can have severe ecological, social and economic impacts through the reduction of ecosystem goods services richness. However, expansion may also offer benefits to ecosystems humans, supply (such as firewood, fodder fruits), well potentially offering refugia in heavily used landscapes. Here, we examine effects four dwarf shrub ( Aspalathus subtingens , Dicerothamnus rhinocerotis Pteronia incana Oedera genistifolia ) on plant richness (at point scale),...

10.1002/ldr.2745 article EN Land Degradation and Development 2017-04-29

The FAO defines non-wood forest products (NWFPs) as all biological materials other than wood that are extracted from forests for human use. Drawing on this, an NWFP has been defined the purposes of this book any raw or processed product, excluding wood, is produced indigenous or wild resource found within African dry and woodlands and harvested either domestic consumption or trade. In some instances, may be cultivated sourced modified nonnatural systems (as some edible leafy plants), but...

10.4324/9781849776547-13 article EN 2010-09-23

Wild intergeneric hybrids are recorded among six genera in the New Zealand Gnaphalieae, but little evidence substantiating their identity has been published. In this paper we evaluate of putative between two species Gnaphalieae endemic to Zealand, Anaphalioides bellidioides and Ewartia sinclairii. The occasionally sympatric north-east South Island wild rarely encountered. To test hybridity hypothesis, specimens from nine were collected one site analysed for 76 morphological characters....

10.1111/j.1095-8339.2003.00282.x article EN Botanical Journal of the Linnean Society 2004-05-01

South Africa is currently the world’s third most biodiverse country, with one of highest concentrations threatened biodiversity in world. Emerging research reveals increasing pressure on this many wild resources continuing to be utilised for livelihood purposes even within urban environments. The Rio conventions, particularly CBD, call an integrated approach conservation that incorporates local environmental knowledge and practices. In a bid market itself as globally competitive, Africa’s...

10.1177/0973408212475232 article EN Journal of Education for Sustainable Development 2012-09-01

(1980). Computer Assisted Quantitative Electroretinography I: A Standardized Method. American Journal of EEG Technology: Vol. 20, No. 2, pp. 57-77.

10.1080/00029238.1980.11080009 article EN American Journal of Electroneurodiagnostic Technology 2015-02-10

Arctotis sect. Anomalae was originally circumscribed to include three annual species (A. dregei, A. setosa and sulcocarpa) endemic South Africa. Subsequently, discrimination of dregei sulcocarpa became confused application the names has varied. In this paper, circumscription two is clarified lectotypes designated for both names. The identity less certain. type setosa, likely have been lodged in Berlin-Dahlem herbarium, not traced no duplicates located. However, from description illustration...

10.1016/j.sajb.2010.05.002 article EN cc-by South African Journal of Botany 2010-07-07

Abstract The name Arctotis plantaginea L. was published by Linnaeus in Species plantarum ed. 2, but application of this has been uncertain and no original elements or illustrations can be traced. Consequently, it is still untypified. In early applications the applied to specimens at least five species until Thunberg unequivocally an element currently known as A . semipapposa (DC.) Beauverd. Subsequently, placed a synonym , nomenclatural priority over latter name. order maintain stability, we...

10.1002/tax.574024 article EN Taxon 2008-11-01

In preparation for the treatment of Arctotis L. (Asteraceae) in upcoming Conspectus Trans-Cape Succulent Karoo Flora South Africa, typification names and synonymy nine species that occur within region, are clarified. The author citation A. argentea is corrected from Thunb. to Aiton, lectotype selected. addition, lectotypes designated auriculata Jacq., campanulata DC., var. puberula canescens cineraria cuprea denudata Thunb., diffusa fastuosa flaccida flammea glabrata laevis leucanthemoides...

10.3417/2009031 article EN Novon A Journal for Botanical Nomenclature 2010-09-13
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