SEALS Digital commons
Not a member yet
7805 research outputs found
Sort by
Communication Science IV : COMS 4/0
No full textExamination on Communication Science IV : COMS 4/0, December 201
Fluid Mechanics II: FMEC2/0 / EFMEC 2/0
No full textExamination on Fluid Mechanics II: FMEC2/0 / EFMEC 2/0, Nov 201
Applied Strength of Materials 111: STMB3/0
No full textExamination on Applied Strength of Materials 111: STMB3/0, Supp Jan 201
Mechanics of Machines 111: MECA3/0
No full textExamination on Mechanics of Machines 111: MECA3/0, Supp June 201
Public Relations III ( Practical ) : PUBR 3/0
No full textExamination on Accounting for marketers: PUBR 3/0, June 201
Using the larval parasitoid, Agathis bishopi (Nixon) (Hymenoptera: Braconidae), for early detection of false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) infested fruit
No full textThaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is one of the major citrus
pests of economic importance for South Africa’s citrus industry. It is endemic to Africa, and
therefore a phytosanitary pest with zero tolerance by most export markets. The cryptic nature
of T. leucotreta makes visual inspection an inefficient method for detecting neonate larvae in
fruit in the packhouse. Therefore, a more accurate method for sorting infested fruit at the
packhouse, particularly for newly infested fruit could ensure market access. A recent study
showed that fruit infested by T. leucotreta emit a chemical profile different from that of a
healthy fruit. Several studies provide evidence that parasitoids locate their hosts feeding on
fruit by exploiting the novel chemical profiles produced due to host herbivory. The aim of
this study was to evaluate the potential of using the naturally occurring behaviour of a larval
parasitoid Agathis bishopi (Nixon) (Hymenoptera: Braconidae) for detection of T. leucotreta
infested fruit, by determining which compound in infested fruit is attractive to parasitoids. Ytube
olfactometer and flight-tunnel bioassays with healthy and T. leucotreta infested fruit
showed a significantly stronger response of A. bishopi female parasitoids to infested fruit.
Among the volatile compounds associated with T. leucotreta infested fruit, D-limonene
elicited the strongest attraction to A. bishopi female parasitoids. Attraction of mated A.
bishopi female parasitoids to T. leucotreta infested fruit and D-limonene significantly
increased after oviposition experience. Behavioural responses of A. bishopi female
parasitoids that were associated with T. leucotreta infested fruit were investigated to
determine which behaviours are distinct and interpretable. Probing and oviposition
behaviours were the most noticeable and were only elicited on infested fruit when parasitoids
contacted T. leucotreta frass, indicating that chemical compounds in frass are short-range
cues used for final host location. Since production of D-limonene by fruit is elevated due to
herbivory by different pests including mechanical injury on fruit, response of A. bishopi
female parasitoids to compounds in frass offers a more specific and potentially useful
mechanism for development of a detection system for T. leucotreta infested fruit. Chemical
analysis of T. leucotreta frass and conditioning A. bishopi parasitoids to respond
behaviourally to compounds in frass is proposed
IsiXhosa storytelling (iintsomi) as an alternative medium for maternal health education in primary healthcare in the Eastern Cape
No full textThe aim of this study is to explore the introduction of IsiXhosa (iintsomi) as an alternative method in the maternal health education in rural Primary Health Care in the Eastern Cape. An informal preliminary observation of a maternal health lesson by the researcher indicated a further need for maternal health educators to introduce storytelling into the health content themes. To re-inforce the maternal health educator lesson on the causes of teenage pregnancy, lifestyles for pregnant women, causes of miscarriage and termination of pregnancy, the Community Health Workers can undoubtedly use isiXhosa iintsomi in selected clinics and maternal waiting homes. As a readily available resource that cuts across all literacy barriers, iintsomi (isiXhosa) fosters a cross-cultural consultation which enables the healthcare worker to convey messages that make sense to the rural women. While the conventional methods of teaching have a tendency to create tension and lack of participation, use of folktale (iintsomi) have huge potential to bring lesson enjoyment; a meaningful interaction and story sharing by the maternal health educator, the pregnant women and greater community; access to important health messages; and strengthened utilisation of Primary Health Care. The study therefore suggests that there is a place for isiXhosa iintsomi: From the Fireplace into the Workplace
Information Sysytems I: EINS110 (Extended Year I)
No full textExamination on Information Systems I: EINS110 (Extended Year I), Nov 201
Investigating how a peer teaching programme could shape the mathematical experience of the participating tutors
No full textThis case study, involving six Grade 10 learners, investigates how a peer tutoring programme could shape the mathematical experience and disposition of the participating tutors. The study is grounded in an interpretive paradigm and data was collected in four sequential phases. The Mathematics Dispositional Functions Inventory (MDFI) instrument was completed by the tutors prior to commencement of the tutoring programme. The tutoring sessions then took place over a three week period during which time each tutor kept a reflective journal. Semi-structured interviews were then conducted, after which each tutor completed the MDFI instrument again in order to track any potential changes in their mathematical disposition. The study found that the participating tutors showed an improved mathematics disposition after the peer tutoring experience. Not only was the peer tutoring programme an empowering experience for the tutors, it also had a positive influence on both the tutors’ self-confidence as well as their perceived mathematical ability