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Interview at Xonxa

  • Authors: Dargie, Dave , Mlanjeni , Mujekwani , Composer Not Specified
  • Date: 1985
  • Subjects: Folk music , Field recordings , Africa, Sub-Saharan , Africa South Africa Xonxa sa
  • Language: English , isiXhosa
  • Type: sound recordings , field recordings , sound recording-musical
  • Identifier: http://hdl.handle.net/10962/320683 , vital:60364 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DD151-01
  • Description: Dave Dargie interview with Mr Mlanjeni and Mr Mujekwani the Catechist on Dave's interest of history of Xonxa people and their knowledge of Ntsikana's Great hymn
  • Full Text: false
  • Date Issued: 1985

Interview at Ngqoko

Engel en aarde : gedagtes oor "natuur en bo-natuur" by die lees van Sheila Cussons

  • Authors: De Villiers, Johanna Helena
  • Date: 1985
  • Subjects: Cussons, Sheila -- Criticism and interpretation
  • Language: Afrikaans
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:3619 , http://hdl.handle.net/10962/d1006960
  • Description: Hierdie studie is In poging om uit die veelgeskakeerde digwerk van Sheila Cussons een draad te neem en dit deur te volg; in die hoop dat dit 'n Ariadne-draad mag word tot beter besef van die ryk gestruktureerdheid en diepte van haar verwysingsveld, en die betekenis daarvan vir ons tyd. Dis dan primer die beeld van die engel wat nagespeur word, as bonatuurlike wese wat nie tot die vlak van die fisiese inkorporeer nie. (From Ch. 1)
  • Full Text:
  • Date Issued: 1985

A novel adjuvant : polymerised serum albumin beads

  • Authors: Dewar, John Barr
  • Date: 1985
  • Subjects: Antigens , Serum albumin
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4104 , http://hdl.handle.net/10962/d1011146 , Antigens , Serum albumin
  • Description: Lee, T. et al (1981) proposed the encapsulation of hormones such as progesterone into serum albumin beads, such that their in vivo proteolysis would allow a gradual release of hormone at low levels, for extended hormone action. It was proposed, in the Department of Microbiology, Rhodes University, to replace the hormone component of the above bead formulation, with virus as antigen, in the development of a vaccine. Beads optimally crosslinked at 1% final glutaraldehyde concentration, containing Nodamura virus, were shown to promote an adjuvant effect in vivo, analogous to the release of antigen from Freund's Complete Adjuvant (FCA), so that extended immunostimulation resulted. It was shown that soluble antigen promoted a short-lived primary immune response, peaking around day 25 following inoculation. Antigen presented in beads, on the other hand, initially elicited a low humoral response, but this response gradually increased up to a peak around day 110 post inoculation, before decreasing. No apparent adverse side-effects were noted following inoculation of antigen-containing serum albumin beads, compared to necrosis following antigen in FCA inoculation, supporting the proposal of using albumin homotypic for the test inoculee animal, so that the beads would themselves be non-immunogenic and would merely act as a vehicle in the vaccine formulation. The indirect enzyme-linked immunosorbent assay (ELISA) was used to monitor the humoral response to antigen following inoculation. Results showed that covalent crosslinking of albumin in the formation of the beads did not promote immunogenicity on the part of the chemically altered albumin. The ELISA test was used to indicate the kinetics of the IgG response to Nodamura virus when presented in formulations such as: Freely soluble virus or its subunit; soluble intact virus inactivated by treatment with glutaraldehyde; intact virus entrapped in serum albumin beads cross; linked at different percentage final glutaraldehyde concentrations and also virus subunit prepared in albumin beads. The presence of virus-neutral ising antibodies was noted in serum obtained from rabbits inoculated with virus entrapped in albumin beads. Virus infectivity, titrated in mice, showed protection against virus challenge after incubation of virus with serum obtained above.
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  • Date Issued: 1985

Sex ratios of Coccophagus atratus compere (Hymenoptera:Aphelinidae) in relation to host availability

  • Authors: Donaldson, John Sydney
  • Date: 1985
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5632 , http://hdl.handle.net/10962/d1004933
  • Description: The mode of sex determination in most Hymenoptera is that of arrhenotokous parthenogenesis, i.e. females originate from fertilised eggs and males develop parthenogenetically from unfertilised ones. Females can therefore determine the sex of each of their offspring by controlling fertilisation. This has led to much speculation about the factors that govern hymenopteran sex ratios. Many sex ratio theories predict that solitary Hymenoptera should produce male and female offspring in a ratio of 1:1. The limited data available on sex ratios in solitary Hymenoptera does not support this prediction. However, for various reasons, data may not be representative and few detailed studies have been done. The purpose of this study was, therefore, to examine sex ratios of Coccophagus atratus, a solitary hymenopteran parasitoid, to determine whether sex ratios in this species approach 1: 1. C. atratus is a suitable species for sex ratio studies because male and female eggs are deposited in different hosts. The sex of deposited eggs can, therefore, be determined at oviposition. This eliminates any possible effects of differential mortality. Laboratory experiments were designed to determine whether C. atratus females deposit male and female eggs in fixed proportions or in a set sequence. In addition, samples of hosts were collected from the field to assess C. atratus sex ratios under natural conditions. Results show that C. atratus females do not produce sex ratios that approach 1:1 and male and female eggs are not deposited in a set sequence. Sex ratios are variable and appear to be related to the relative abundance of hosts suitable for female development and for male development. These results are discussed in relation to current sex ratio theories.
  • Full Text:
  • Date Issued: 1985

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