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Seisoensveranderinge in die koolhidraatinhoud van jong appelbome
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. J.C. Stassen --- ,Gereelde ontledings van die koolhidraatfraksies in jong appelbome het getoon dat suiker 'n relatief klein gedeelte van die koolhidrate in die boomdele uitmaak, en veral in die wortels voorkom. Stysel akkumuleer in die wortels tot finale blaarval in die winter,... -
Anatomical and compositional changes during fruit development of ‘Galia’ melons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- Department of Agronomy, Republic of South Africa G.A. Agenbag --- Department of Agronomy, Republic of South Africa P. Langenhoven --- Department of Agronomy, Republic of South Africa G. Jacobs --- Department of Horticultural Science, Republic of South Africa E.M. Marais --- Department of Botany, Republic of South Africa‘Galia’ melons were grown under controlled conditions and pruned to bear two fruits with 19 leaves per plant. Leaves and fruits were sampled and analysed at eight different stages. Pericarp cell division and enlargement occurred during the first week after... -
Seasonal variations in carbohydrate content of Carica papaya plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. Allan --- Horticultural Science, Republic of South AfricaMonthly samples were collected of roots, stems, petioles and leaf blades of clonal female ‘Honey Gold’ papaw (Carica papaya L.) plants, in the cool subtropical Pietermaritzburg area, to study any seasonal variations in carbohydrate content of this tropical plant which... -
Etiolation aids rooting of Protea cynaroides cuttings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.C. Wu --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, South Africa E.S. du Toit --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, South Africa C.F. Reinhardt --- Department of Plant Production and Soil Science, Faculty of Natural and Agricultural Sciences, South AfricaThe role that starch content and blanching play in the rooting of Protea cynaroides cuttings was studied. P. cynaroides stems were blanched on the motherplant in the field, which resulted in a higher starch concentration in the cuttings. The relationship... -
Evaluating the Streif index against commercial subjective predictions to determine the harvest date of apples in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elmi Lötze --- Department of Horticultural Science, South Africa Oloff Bergh --- , South AfricaFor the local deciduous fruit industry, which mainly exports fruit, determination of the optimum physiological harvest maturity for apples to ensure high fruit quality after long-term storage is still an important goal. This is performed by a subjective determination based... -
Component dry masses and carbohydrate contents in honeybush I: Cyclopia genistoides
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Wooldridge --- , South Africa ME Joubert --- , South Africa M Booyse --- , South AfricaCyclopia (honeybush), a new and largely unstudied South African horticultural crop, was investigated by carrying out a reconnaissance-level survey of C. genistoides (Cg) populations. Four-year average total dry mass (DM) in plantation-grown Cg cuttings and seedlings, and wild (veld) plants... -
Component dry masses and carbohydrate contents in honeybush II: Cyclopia subternata
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Wooldridge --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa ME Joubert --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa M Booyse --- Agricultural Research Council Biometry Unit, South AfricaA four-year reconnaissance-level survey was carried out in a honeybush (Cyclopia subternata; Cs) population to obtain information concerning this new South African horticultural crop. Average total dry mass (DM) in Cs cuttings under plantation conditions was 2 481 g plant−1,... -
Phenotypic plasticity and local adaptation in two extreme populations of Acacia karroo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Bayonne Mboumba D WardPhenotypic plasticity is the effect of growth variability in response to different environmental conditions. Adaptive phenotypic plasticity is more specific; it is the ability of a single genotype to produce an array of phenotypes depending on the environmental extent. We... -
Evidence-based medicine: Do we need gelatins and starches?
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: AG Parrish --- Department of Internal Medicine,For more than a decade, systematic reviews have questioned the value of colloids in fluid resuscitation. A Cochrane review that was updated in early 2012 found no mortality advantage relative to crystalloids across a range of conditions for gelatins [risk... -
Effect of graded levels of dietary carbohydrate on growth, feed utilisation and intestinal microbial community structure in dusky kob Argyrosomus japonicus fed a pelleted diet
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NC Mabasa --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa A Nel --- Department of Ichthyology and Fisheries Science, South AfricaThe ability to utilise carbohydrates is limited for many predatory marine fishes. Graded levels of dietary carbohydrate (4.1–24.6%) were formulated using pregelatinised maize starch, to determine optimal levels for dusky kob Argyrosomus japonicus, an emerging mariculture finfish for which pelleted... -
Effect of cassava starch on shrinkage characteristics of concrete
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Akindehinde Ayotunde Akindahunsi --- Department of Civil Engineering, Nigeria Wolfram Schmidt --- BAM Federal Institute for Materials Research and Testing, GermanyThe use of starch and its derivatives in concrete as an admixture to modify relevant properties of concrete has been on the increase in recent times. It is known to modify the rheology, affect the hydration kinetics of cement, and... -
Does spring defoliation affect energy reserves in a South African mesic grassland geophyte?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- c/o School of Life Sciences, University of KwaZulu-Natal, South Africa Sindiso Nkuna --- School of Life Sciences, University of KwaZulu-Natal, South AfricaOvergrazing reduces the abundance of mesic grassland forbs, including geophytes. The potential negative effect of spring grazing, aimed at exploiting high-quality grass forage, on energy reserves in underground storage organs (USOs) of a mesic grassland geophyte, Merwilla plumbea (Lindl.) Speta,... -
4. “Make starchy foods part of most meals”: a food-based dietary guideline for South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Vorster HH --- North-West University,A national working group, convened by the Directorate Nutrition in the Department of Health, recently revised the set of South African food-based dietary guidelines (FBDGs). The objective of this technical review paper is to motivate and support the FBDG “Make...