Faculty of Science
http://hdl.handle.net/10311/16
2017-12-13T03:42:29ZOccurrence of antibiotic-resistant enterococci in some insects from stored food products in Botswana
http://hdl.handle.net/10311/1794
Occurrence of antibiotic-resistant enterococci in some insects from stored food products in Botswana
Allotey, Joseph; Loeto, D.; Moseki, P.; Wale, K.R.; Randome, I.; Kgositlou, M.J.; Morobe, I.C.
The occurrence of antibiotic-resistant enterococci in some insects from stored food products from fourteen geographical areas in Botswana was investigated in the present study. Eleven insect species were identified from a total of 737 stored food products. Oryzaephilus surinamensis was the most predominant. It comprised 65% and 51.1% of the species in food products from households and the selected warehouse respectively; followed by Tribolium castaneum, which comprised 17.1% of the species in stored foods from households and 32.3% of the species in stored food products from the warehouse. There was no significant difference (p<0.05) in the distribution of the insect species from the geographical areas sampled. Sixty-eight per cent (68%) of the total insect numbers harboured Enterococcus species. Enterococcus species were isolated from Prostephanus truncates and Cryptolestes ferrugeneus, obtained from laboratory stored maize cultures. The isolation rate of enterococci was significantly higher (p<0.05) in laboratory stored product insects as compared with insects collected from stored foods sampled from the selected geographical areas. Enterococci showed total resistance to erythromycin, fusidic acid, oxacillin, novobiocin, and penicillin G but were all sensitive to chloramphenicol. This shows the capacity of some stored product insects to carry antibiotic-resistant and potentially pathogenic Enterococcus species. The latter is of public health importance and therefore there is need to monitor the occurrence of Enterococcus species in insects infesting stored products. These insects can act as vectors of pathogenic microorganisms & cause health hazards to consumers if proper pest management strategies are not applied to stored products.
2017-01-01T00:00:00ZOn the Riesz representation theorem and integral operators
http://hdl.handle.net/10311/1770
On the Riesz representation theorem and integral operators
Robdera, Mangatiana A.
We present a Riesz representation theorem in the setting of extended integration theory as introduced in [6]. The result is used to obtain boundedness theorems for integral operators in the more general setting of spaces of vector valued extended integrable functions.
2015-12-14T00:00:00ZFundamental Theorem of Calculus in Topological Vector Spaces
http://hdl.handle.net/10311/1766
Fundamental Theorem of Calculus in Topological Vector Spaces
Robdera, M. A.; Kagiso, D. N.
We extend the notions of integration and differentiation to cover the class of functions taking values in topological vector spaces. We give versions of the Lebesgue-Nikodym Theorem and the Fundamental Theorem of Calculus in such a more general setting.
2017-10-01T00:00:00ZOn cartesian nets and fubini-tonelli type theorem
http://hdl.handle.net/10311/1713
On cartesian nets and fubini-tonelli type theorem
Robdera, Mangatiana A.
The notion of Cartesian net is introduced in order to provide an appropriate setting for the notion of double limit for directed functions defined on Cartesian products of spaces. As an application, we obtain extensions of the Fubini-Tonelli type theorem to the setting of the extended notion of integrability recently introduced.
Original research paper
2017-04-01T00:00:00Z