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Relationship between acid saturation and hydrogen activity of soils from different districts in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Bloem --- Department of Agriculture, Conservation and Environment, North West Province, Republic of South AfricaSoil analyses results from six districts in the western maize producing areas of South Africa were used for correlating exchangeable acidity and acid saturation with hydrogen ion activity (pH). From the resulting regression equations, the pH values that corresponded with... -
Effect of timing and concentration of rest breaking agents on budburst in ‘Bing’ sweet cherry under conditions of inadequate winter chilling in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.G. Sheard --- Department of Horticultural Science, South Africa S.D. Johnson --- , South Africa N.C. Cook --- , South AfricaThe effect of timing of various rest breaking agents (RBAs) on vegetative and floral budburst, and production efficiency was investigated on 4-year-old ‘Bing’ sweet cherry trees on ‘Gisela® 5’ rootstock. Two experiments were conducted, near Clarens (28°28’S; 28°19’E, 1860 m.a.s.l)... -
The Structure of Cellulose by Conformational Analysis.
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. Pizzi --- , N. Eaton --- ,Conformational analysis studies on the tertiary structure of cellobiose and methyl-β-cellobioside were carried out by using calculations of Van der Waals, H-bond, electrostatic and torsional energy interactions between the atoms and groups of the molecules. Energy maps in function of... -
The Structure of Cellulose by Conformational Analysis.
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. Pizzi --- Council for Scientific and Industrial Research, South Africa N. Eaton --- Council for Scientific and Industrial Research, South AfricaThe Meyer/Misch and related models were found to be the most energetically stable for the crystalline structure of cellulose I. The cellobioside structure is the monomer of cellulose I as structures having cellobiose as monomer have been proven to be... -
Inducible defences in Acacia sieberiana in response to giraffe browsing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AD Zinn D Ward K KirkmanAcacia trees comprise a principal component of the diet of many African browsers. The resultant browsing pressure has led to the evolution of both physical and chemical responses in Acacia trees. In an observational study, we investigated the physical and... -
Perioperative care of an infant with pyruvate dehydrogenase deficiency
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: E Dewhirst --- Research Fellow, Department of Anaesthesiology and Pain Medicine, S Rehman --- Department of Anaesthesiology and Pain Medicine, JD Tobias --- Chairman, Department of Anaesthesiology and Pain Medicine,The authors present the anaesthetic management of two infants with pyruvate dehydrogenase complex deficiency (PDCD), a rare genetic disorder of carbohydrate metabolism leading to lactic acidosis and neurological impairment. In the first case, a seven-month-old infant, undergoing closed reduction of... -
Identification and molecular characterisation of Colletotrichum species from avocado, citrus and pawpaw in Ghana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Joseph O Honger --- Soil and Irrigation Research Centre, School of Agriculture, College of Basic and Applied Sciences, Ghana Samuel K Offei --- Biotechnology Centre, College of Basic and Applied Sciences, Ghana Kwadwo A Oduro --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, Ghana George T Odamtten --- Botany Department, College of Basic and Applied Sciences, Ghana Seloame T Nyaku --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, GhanaOwing to previous identifications based solely on morphological characteristics, the identity of the causal agents of anthracnose disease of pawpaw and avocado in Ghana is in doubt. In addition, the pathogen has not been identified previously on citrus. In this... -
Physical and hydrological properties of peatland substrates from different hydrogenetic wetland types on the Maputaland Coastal Plain, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Franziska Faul --- Faculty of Earth and Environmental Sciences, Germany Marvin Gabriel --- Faculty of Life Science, Germany Niko Roßkopf --- Faculty of Life Science, Germany Jutta Zeitz --- Faculty of Life Science, Germany Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Sciences, South Africa Mathilde L Pretorius --- Centre for Environmental Management, South Africa Piet-Louis Grundling --- Centre for Environmental Management, South AfricaThe Maputaland Coastal Plain in KwaZulu-Natal province is home to 60% of all peatlands occurring in South Africa. These ecosystems are increasingly threatened by unsustainable agricultural utilisation, a growing population and climate change. The aim of the study was, therefore,... -
Prevalence of succinate dehydrogenase deficiency in paragangliomas and phaeochromocytomas at a tertiary hospital in Cape Town: a retrospective review
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: Cassandra Bruce-Brand --- , South Africa Abraham C van Wyk --- , South Africa -
Physiological response of ryegrass (Lolium spp.) grown at different temperatures to glufosinate ammonium application
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai Mucheri --- , South Africa Petrus J Pieterse --- , South Africa Carl F Reinhardt --- , South Africa Aleysia Kleinert --- , South AfricaEfficacy of glufosinate ammonium is influenced by temperature. However, several studies show variable results. The response of ryegrass (Lolium spp.) to glufosinate ammonium activity at different temperatures was investigated. Ryegrass was grown at 10/15, 15/20, 20/25, and 25/30 °C (night/day)...