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Importance of rainfall oscillations in agricultural planning
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.L. du Pisani --- ,Evidence seems to indicate that the rainfall in the summer rainfall area of the RSA exhibits an oscillatory nature with a period of 16–20 years. To help maize farmers in planning for a dry or wet cycle the most recent... -
Simultaneous selection for yield and ratooning ability in sugarcane genotypes using analysis of covariance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM Zhou --- , South Africa MD Shoko --- Faculty of Agricultural Sciences, ZimbabweRatooning ability increases sugarcane production economics by reducing frequency of planting. During sugarcane breeding, indirect selection for pest resistance and direct selection for high ratoon yields increases ratooning ability. The objective of this study was to describe the simultaneous screening... -
Influence of salinity and temperature on the larval development of the crown crab, Hymenosoma orbiculare (Crustacea: Brachyura: Hymenosomatidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Isabelle Papadopoulos BrentK Newman DaveS Schoeman TrisH WooldridgeAlthough the crab Hymenosoma orbiculare appears to complete its entire life cycle within estuaries, the salinity and temperature requirements for its successful larval development are not known. The present study therefore evaluated larval response to salinity and temperature in combination... -
Heavy metal pollution levels in water and oysters, Saccostrea cucullata, from Mzinga Creek and Ras Dege mangrove ecosystems, Tanzania
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Augustina Mtanga JohnF MachiwaHeavy metal (cadmium, chromium, copper, mercury, lead and zinc) concentrations in mangrove forests were investigated in water, suspended particulate matter (SPM) and oyster samples from the Mzinga Creek and Ras Dege mangrove stands, Tanzania, using Inductively Coupled Plasma–Atomic Emission Spectroscopy... -
Spatial genetic pattern in an economically beneficial insect, the cyclical African wild silk moth (Gonometa postica)
Item type: Journal Article • Journal: African Zoology • Authors: Timothy C. Bray --- Department of Zoology and Entomology, South AfricaThe African wild silk moth (Gonometa postica) exhibits large inter-annual population size fluctuations in the Kalahari region of southern Africa. Spent cocoons from this species are currently being utilized in a local silk industry. An understanding of the recolonization dynamics... -
IPO market cycles and expansion curse: Evidence from Chinese IPO market
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Yonghong Jin --- Department of Finance, School of Business, China Jianbang Guo --- Department of Finance, School of Business, China Xiaozhou Zhou --- Department of Finance, School of Business, China Sai-Ping Li --- Institute of Physics, Academia Sinica, TaiwanThere are two theories on the relationship between primary and secondary markets for securities. The first states that the expansion of IPO financing leads to a decline in stock prices, i.e. an expansion curse effect. The other states that the... -
Tumour and treatment factors influencing the outcome of chemo-radiation in stage IIB cervical cancer: a single institution experience
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Mtabeni Jemu --- Division of Radiation Oncology, South Africa Leon van Wijk --- Division of Radiation Oncology, South Africa Michelle Parker --- Radiobiology Section, Division of Radiation Oncology, South Africa Glenn Jones --- School of Clinical Medicine and Research, BahamasObjective: This study examined the effects of treatment and tumour factors on the overall survival of patients completing chemo-radiation for stage IIB cervical cancer, to identify modifiable factors that might improve outcome. -
Temperature cycles beneath, and adjacent to, intertidal boulders and associated differences in biotic composition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C van Rensburg --- , South Africa A Robbins --- , South Africa C Griffiths --- , South AfricaThe only previous study on the macrobiota of South African boulder shores showed this assemblage to be more diverse than on nearby rocky platforms, but the drivers of that difference remain unresolved. We recorded water and air temperatures under intertidal... -
A new lower bound on the total domination number of a graph
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Majid Hajian --- Shahrood University of Technology, Iran Michael A. Henning --- University of Johannesburg, South Africa Nader Jafari Rad --- Shahed University, IranA set S of vertices in a graph G is a total dominating set of G if every vertex in G is adjacent to some vertex in S. The total domination number, γt (G), is the minimum cardinality of a...