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Alachlor-geïhduseerde veranderinge in sekere membrane van Sorghum bicolor (L.) Moench-plante
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. Reinhardt --- Departement Plantproduksie, Republiek van Suid-Afrika P.C. Nel --- Departement Plantproduksie, Republiek van Suid-AfrikaSekere ultrastrukturele veranderinge veroorsaak deur alachlor (α-chloor-2′, 6′-diëtiel-N-metoksimetielasetanilied) in graansorghumplante is ondersoek. Elektronmikro- skoopmikrograwe het aangetoon dat disintegrering van vakuoolmembrane, kernmembrane en omhullingsmembrane van chloroplaste voorgekom het by alachlorbehandelde plante. -
The effect of bendioxide and 2,4-DB on the early growth and leaf development of three soybean (Glycine max (L.) Merr.) cultivars and the control of morning glory (Ipomoea purpurea (L.) Roth.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.L. Greenfield --- Department of Agronomy, Republic of South Africa M.R. Lagesse --- Department of Agronomy, Republic of South AfricaThree soybean (Glycine max (L.) Merr.) cultivars (Edgar, Duiker and Komati) were grown in pots together with morning glory (Ipomoea purpurea (L.) Roth.). Plants were exposed to three levels of bendioxide (0, 0.96 and 1.44 kg a.i. ha−1) in combination... -
Storage root formation at individual nodes of the sweet potato (Ipomoea batatas (L.) Lam)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.P. du Plooy --- , Republic of South Africa A.A. van den Berg --- , Republic of South Africa P.S. Hammes --- Department of Plant Production, Republic of South Africa L.C. Holtzhausen --- Department of Plant Production, Republic of South AfricaLittle or no information is available on the contribution of individual subterranean nodes to the storage root formation in sweet potatoes. Therefore, two field trials were conducted where apical vine cuttings of various cultivars were planted vertically or horizontally, with... -
Effect of temperature, soil moisture content and type of cutting on establishment of sweet potato cuttings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Belehu --- Department of Plant Production and Soil Science, Republic of South Africa P.S. Hammes --- Department of Plant Production and Soil Science, Republic of South AfricaEffective rooting is essential for successful crop establishment from cuttings. The objective of this study was to determine the effect of temperature and soil water content on the root and shoot growth during the early establishment of sweet potato cuttings... -
Field evaluation of Ugandan sweetpotato germplasm for yield, dry matter and disease resistance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. Yada --- , Uganda P. Tukamuhabwa --- Department of Crop Science, Uganda A. Alajo --- , Uganda R.O.M. Mwanga --- , UgandaA total of 946 morphologically distinct accessions of sweet-potato (Ipomoea batatas [L.] Lam) germplasm collected from Uganda were evaluated along with four released cultivars for root yield, dry matter, sweetpotato virus disease (SPVD) and Alternaria bataticola blight disease resistance for... -
NEW ARRENURUS SPECIES (ACARI, HYDRACHNELLAE, ARRENURIDAE) FROM SOUTHERN AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K.O. Viets --- , DeutschlandFive new Arrenurus spp, from Southern Africa are described: A. amoenus sp. nov. from Natal, A. agnewi sp. nov., A. curtipalpus sp. nov., A. pedatus sp. nov. and A. cavatus sp. nov. from Botswana. The species from Natal came from... -
Fish communities along environmental gradients within the Comoé River basin, Côte d'Ivoire
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: StanislasS Yao EssetchiP Kouamélan Tidiani Koné Valentin N'Douba Gooré Bi Frans Ollevier DirkF E Thys van den AudenaerdeEighty-four sites in the Comoé basin (Côte d'Ivoire, West Africa) were sampled to identify fish assemblages and their relationships with some environmental variables. Seventy-six freshwater fish species were collected from 22 families and 44 genera: 11 marine and/or brackish water... -
Analytical detection of parasite infection of Dinophysis norvegica using FISH probes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PS Salomon S Janson L-Å Gisselson E GranéliParasites of the genus Amoebophrya infect several free-living dinoflagellates, including harmful species. Whereas advanced infection can be easily detected, earlier stages of infection are more difficult to establish. rRNA-based fluorescent in situ hybridisation (FISH) probes specific to Amoebophrya sp. infecting... -
Performance of Eucalyptus dunnii as influenced by vegetation control when felled at nine years in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: KM LittleIn 1997, a trial was initiated to determine the impact of eight vegetation control treatments on the growth of Eucalyptus dunnii Maiden at a warm-temperate site in the KwaZulu-Natal Midlands, South Africa. The treatments included a Weedy and Weed-free check,... -
Strength and stiffness capacity utilisation of timber members in roof truss structures
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: C Brand Wessels --- Department of Forest and Wood Science, South Africa Nils-Olaf Petersen --- Department of Forest and Wood Science, South AfricaThe main objective of this study was to determine which property, of the six strength and stiffness properties used in structural timber design, was the most influential in the design of nail-plated roof trusses. Thirty recently completed nail-plated roof truss... -
The potential of young, green finger-jointed Eucalyptus grandis lumber for roof truss manufacturing
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Philip L Crafford --- Department of Forest and Wood Science, South Africa C Brand Wessels --- Department of Forest and Wood Science, South AfricaSouth Africa is a timber-scarce country that will most probably experience a shortage of structural softwood lumber in the near future. In this study the concept of using young, green finger-jointed Eucalyptus grandis lumber was evaluated for possible application in... -
Detection of amoeba-associated Legionella pneumophila in hospital water networks of Johannesburg
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: P Muchesa --- Water and Health Research Centre, Faculty of Health Sciences, South Africa M Leifels --- Department of Hygiene, Social and Environmental Medicine, Germany L Jurzik --- Department of Hygiene, Social and Environmental Medicine, Germany TG Barnard --- Water and Health Research Centre, Faculty of Health Sciences, South Africa C Bartie --- Water and Health Research Centre, Faculty of Health Sciences, South AfricaThe prevalence of free-living amoeba and associated Legionella spp. in hospital water systems may pose a risk of Legionnaires’ disease to immuno-compromised patients. This study investigated the occurrence of amoeba-associated Legionella pneumophila in three South African hospital water systems. A... -
Increased planting density as a means for improving Pinus elliottii lumber stiffness
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gideon M Froneman --- Department of Forest and Wood Science, South Africa C Brand Wessels --- Department of Forest and Wood Science, South AfricaFaster growth and reduced harvesting ages are causing a reduction in the stiffness of lumber from South African grown pine plantations. The objective of this study was to determine whether increased planting densities of Pinus elliottii would result in improved... -
Growth and modulus of elasticity of pine species and hybrids three years after planting in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: O Nilsson --- , Sweden G R Hodge --- , USA L J Frampton --- , USA W S Dvorak --- , USA J Bergh --- , SwedenGrowth data and modulus of elasticity (MOE) of 11 different pine species and hybrids were examined at six sites in three regions in South Africa. Growth traits and three MOE variables were measured at three years of age in order... -
Exponential stability of a laminated beam system with thermoelasticity of type III and distributed delay
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Kassimu Mpungu --- Mountains of the Moon University, UgandaIn this work, we consider a one-dimensional laminated Timoshenko beam system with thermoelasticity of type III and distributed delay. Our concern is to investigate the exponential stability of the vibrations in the system without structural damping. By exploiting the perturbed...