Browsing Biological Sciences by Title
Now showing items 668-687 of 733
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A taxonomic reassessment of the subtribe Asciepiadinae (Asclepiadaceae) in Southern Africa : Vol. 2.
(1999)This study extends an earlier M.Sc. research project on the narrow-leaved species of the genus Asclepias L. (30 species) to cover the entire subtribe Asclepiadinae sensu K. Schum. in southern Africa- (182 species in 23 ... -
Taxonomic revision of the Memecylon natalense species-complex in southern Africa.
(2018)iv ABSTRACT Two Memecylon species (M. natalense and M. bachmannii) were previously recognized in southern Africa, and three species of M. section Buxifolia as occurring in Mozambique (M. natalense, M. torrei and M. ... -
A taxonomic revision of the tribe Desmodieae (Leguminosae - Papilionoideae)
(1984)The tribe Desmodieae has a pantropical distribution and is one of the most advanced tribes in the subfamily Papilionoideae. Despite this fact, the tribe was already present in the fossil record of the early Tertiary and ... -
Taxonomic studies in the tribe Justicieae of the family Acanthaceae.
(1985)Unable to copy from pdf. -
The taxonomy and aspects of the ecology of the Ephemeroidea (Insecta: Ephemeroptera) of the Mooi River, KwaZulu-Natal Province, Republic of South Africa.
(2004)The Ephemeroidea or burrowing mayflies are a superfamily of the Ephemeroptera (mayflies) with a worldwide distribution. Recent decades have seen a sharp decline in their abundance globally. Literature reviews of the past ... -
Technique establishment for in vitro selection of drought tolerant sugercane genotypes.
(2015)There is a need to have constant supply of sugarcane varieties adapted to different South African regions. However, the genetic improvement and selection of sugarcane cultivars with superior traits, e.g. drought tolerance, ... -
The effect of developmental status and excision injury on the success of cryopreservation of germplasm from non-orthodox seeds.
(2007)The zygotic germplasm of plant species producing desiccation-sensitive seeds can be conserved in the long-term only by cryopreservation. Usually the embryonic axis is excised from the cotyledons and is used as the explant ... -
Thermal physiology and predicted distribution of Zygogramma bicolorata (Chrysomelidae), a promising agent for the biological control of the invasive weed Parthenium hysterophorus in South Africa.
(2008)Parthenium hysterophorus (Asteraceae), classified as an emerging weed in South Africa, has become abundant throughout large parts of southern and eastern Africa. In South Africa it has invaded areas in KwaZulu-Natal, ... -
Thermoregulation and nocturnal heterothermy in the white-backed mousebird (Colius colius)
(1998)Thermoregulatory patterns, the use of rest-phase heterothermy, the energetic significance of clustering behaviour, and the role of sunning behaviour in thermoregulation were assessed in the white-backed mousebird Colius ... -
Thermoregulation in breeding crowned plovers (Vanellus coronatus)
(2000)Ground-nesting birds nesting in the open have to cope with an extreme thermal environment. Their nests egos and chicks are often located within the boundary layer and are exposed to, direct solar radiation. In preventing ... -
Thermoregulation in free-ranging African-endemic small mammals : the rock elephant shrew, Elephantulus myurus and the lesser bushbaby, Galago moholi.
(2005)Endothermy in birds and mammals is invariably associated with homeothermy. However, homeothermy can only be maintained if sufficient energy is obtained to meet the animals' maintenance budget. In mammals, daily torpor and ... -
Thermoregulatory capacity of arboreal small mammals in the tropics : insights from the past and implications for the future.
(2018)Species are expected to respond to global warming through range shifts that are either poleward or towards higher altitude such that they track the movement of their current thermal niches. This generalized view is ... -
Tissue culture of selected indigenous monocotyledons.
(1988)Components of the South African indigenous flora are disappearing at an alarming rate, due to pressures on land use. The flora is protected by proclamation of reserves and conservation legislation, however these measures ... -
Tissue culture studies on citrus and Welwitschia.
(1972)Part I. IN VITRO CULTURE OF CITRUS EMBRYOS AND NUCELLAR ISOLATES Zygotic embryos of the Ellendale mandarin, a monoembryonic variety of citrus, were cultured on modified basal media of Murashige and Skoog (BM[1]), and ... -
Tissue culture studies on Peperomia clusifolia Hook. and Strongylodon macrobotrys A. Gray.
(1982)Tissue culture studies were carried out on two ornamental plant species, Strongylodon macrobotrys A. Gray and Peperomia clusifolia Hook. Successful in vitro regeneration of plantlets was achieved in the latter species, using ... -
Towards a predictive understanding of savanna vegetation dynamics in the eastern Lowveld of South Africa : with implications for effective management.
(2005)The purpose of this study was to develop and test a predictive understanding of the vegetation dynamics of the Lowveld of South Africa (30°35'E to 30°40'E and 24°00'S to 25°00'S). The study covered about 5000 km2 in ... -
Towards ameliorating some of the stresses associated with the procedural steps involved in the cryopreservation of recalcitrant-seeded germplasm.
(2017)Abstract available in PDF file. -
Towards developing effective decontamination procedures for in vitro culture of embryonic axes excised from recalcitrant seeds.
(2013)Control of seed-associated micro-organisms is vital in reducing losses of plants of economic importance. Recalcitrant seeds being metabolically active and able to be stored only under conditions of high relative humidity ... -
Towards development of a cryopreservation protocol for germplasm of Podocarpus henkelii.
(2012)The trees belonging to the genus Podocarpus, of which only four species are native to South Africa, are renowned for their superior quality timber. Prior to 1880, Podocarpus henkelii, together with P. falcatus and P. ...