Browsing by Author "Kandjengo, Lineekela"

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    Cadmium and lead levels in three freshwater fish species from the Zambezi region, Namibia
    (2020) Madzingira, Oscar; Lifumbela, L.Z.; Kandiwa, Erick; Kandjengo, Lineekela; Mushonga, Borden
    Muscle tissue from three-spotted tilapia (Oreochromis andersonii) (n = 11), sharp tooth catfish (Clarias gariepinus) (n = 14) and tigerfish (Hydrocynus vittatus) (n = 12) were sampled from a market in the Zambezi region, Namibia in June 2018 and analysed for cadmium and lead. Cadmium was not detected in the three fish species. Mean lead levels in all three fish species (0.09–0.19 mg kg−1) were below the recommended safe level of 0.3 mg kg−1. Catfish had the highest mean lead concentrations, followed by tigerfish and tilapia in descending order. However, the differences in mean lead concentrations between the three fish species were not statistically significant (ANOVA, p = 0.18). These results show that the fish tested were safe for human consumption with respect to the metals tested. It is recommended that more metals and other contaminants, such as pesticides, be monitored robustly in water, sediment and fish, using the recommended protocols, in order to generate data that can be reliably used for human health risk assessments in the future.
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    The Feeding habits of the Giant African Bullfrog (Anura: Pyxicephalidae: Pyxicephalus Adspersus Tschudi, 1839) of the Cuvelai Drainage System in Northern Namibia
    (University of Namibia, 2014) Okeyo, Daniel O.; Kashea, Martha M.; Kandjengo, Lineekela
    The recorded diet of the giant African bullfrog Pyxicephalus adspersus of the Cuvelai drainage plains (the oshanas) of northern Namibia is presented. Among all the stomach contents; insects accounted for the greatest diversity of the orders recorded. The most abundant prey items to the juvenile frogs come from Orthoptera (20.0%), Lepidoptera (16.0%), Isoptera (15.5%), Coleoptera (12.0%), while to the adult frogs also come from Orthoptera (20.0%) but followed by Coleoptera (11.8%), Odontata (11.0%) and Hemiptera (10.0%) in that hierarchical order. A habit of cannibalism is indicated; tadpoles form the fifth (11.0%) and second (13.1%) most important food item for juvenile and adult frogs, respectively. Diet shift is evident, from ants to tadpoles and beetles as the frogs become larger.
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    Harvesting and consumption of the giant African bullfrog, a delicacy in northern Namibia
    (University of Namibia Press, 2015) Okeyo, Daniel O.; Kandjengo, Lineekela; Kashea, Martha M.
    Namibia covers an area of approximately 800,000 square kilometres and has a human population of about 2.1 million. This gives an average density of about 2.6 people per square kilometre. Most of the people of Namibia belong to one of five main ethnic groups of African origin: the Aawambo, Ovaherero, Kavango, Caprivian, and Damara and Nama peoples. The diet of ethnic Namibians comprises a variety of foods such as millet, sorghum, maize, sweet potatoes, groundnuts and fruits. Millet and maize are staple foods. Fruits are mainly wild and indigenous. Staple foods in northern Namibia are generally accompanied with indigenous vegetables, beef, lamb, mutton or fish. Giant African bullfrogs – locally known as efuma (sing.) or omafuma (pl.) – form a delicacy, especially during the rainy season (Figure 10.1). The Aawambo are not alone in appreciating these frogs (Pyxicephalus adspersus) as a delicacy. Reports exist of others also eating it within Namibia as well as elsewhere in southern Africa. For example, the Nsenga people in the eastern Luangwa Valley (Eastern Province, Zambia) also consume whole bullfrogs, which they locally call kanyama kaliye fupa – the animal without bones. The giant African bullfrog is distributed widely throughout southern and eastern Africa (Figure 10.2) and found in areas of Namibia, Angola, Botswana, South Africa, Zimbabwe, Zambia, Mozambique, Malawi, Tanzania and Kenya (Channing, 1991; Conradie, Branch, Braack, & Manson, 2010; IUCN, 2011). It is reported to occur in the central and northern areas of Namibia (Channing 1991; Griffin, 1997) and is found in considerable numbers on the northern plains, especially during the early rain season.
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    The isolation, structural determination and bioactivity of 1E,3R,4S,5E,7Z-1-bromo 3,4,8-trichloro-7- (dichloromethyl)-3-methylocta-1,5,7-triene from a Namibian Plocamium species
    (University of Namibia, 2016) Knott, Michael G.; Kapewangolo, Petrina T.; Louw, Stefan; Brand, J.; Kandjengo, Lineekela; Ishola, Anthony
    A known compound namely 1E,3R,4S,5E,7Z-1-bromo-3,4,8-trichloro-7- (dichloromethyl)-3-methylocta-1,5,7-triene was isolated from a Namibian Plocamium species for the first time and characterized by means of one and two dimensional Nuclear Magnetic Resonance (NMR) spectroscopic data and Mass Spectrometry (MS) analysis. The compound exhibited minimal inhibition against HIV-1 reverse transcriptase, with a 50% inhibitory concentration of > 1000μM. However, literature reviews indicate that this compound has good cytotoxic in vitro effects.