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A study of the rabbit eye test system to determine the activity of acidic non-steroidal anti-inflammatory agents

  • Authors: Wiseman, Ian Charles
  • Date: 1977
  • Subjects: Nonsteroidal anti-inflammatory agents , Anti-inflammatory agents
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:3855 , http://hdl.handle.net/10962/d1013276
  • Description: From introduction : "Inflammation per se, has been defined sufficiently to permit a rational approach to the search for drugs that modify this process, but satisfactory animal models for most rheumatoid diseases are not available". (Swingle 1974) In the search for new meaningful procedures for the detection and evaluation of anti-inflammatory drugs, the rabbit eye as a test system was studied.
  • Full Text:
  • Date Issued: 1977

Lona bo mme le bo ntate

Modimo wa rona

Konyana ya Modimo

Die psigopaat as kliënt in die Maatskaplike Werk

  • Authors: Venter, Pieter Viviers
  • Date: 1977
  • Language: Afrikaans
  • Type: Thesis , Masters , MSocSc
  • Identifier: vital:21106 , http://hdl.handle.net/10962/6410
  • Full Text:
  • Date Issued: 1977

Gewestelike verskynsels in die Afrikaanse spreektaal van Oos-Kaapland met spesiale verwysing na Albanie

  • Authors: Van der Mescht, J W F (Johannes Willem Frederik)
  • Date: 1977
  • Subjects: Afrikaans language -- Dialects
  • Language: Afrikaans
  • Type: Thesis , Masters , MA
  • Identifier: vital:3643 , http://hdl.handle.net/10962/d1014568
  • Description: By 'n dialekgeografiese studie van hierdie aard sal dit by uitstek die verstandigste wees om te begin by 'n omgewing waarin die ondersoeker gebore is en grootgeword het. Die omgang van die ondersoek en die uitgestrektheid van die gebied wat hierby betrokke is maak dit egter vir 'n boorling net so moeilik as vir 'n goeie waarnemer uit enige ander spraakgebied wat ook daartoe in staat behoort te wees om bepaalde foniese, leksikale, grammatiese, semantiese en sintaktiese verskynsels, eienaardighede en tendensies in die spreektaal op te merk. My bekendheid en omgang met Afrikaanssprekendes in hierdie streek wil ek nietemin kortliks soos volg aandui: (a) Wat vir hierdie studie as "randgebiede" beskou kan word. Gebore en opgegroei in Willowmore (19 jaar), onderwysopleiding op Graaff-Reinet (3 jaar). Onderwysondervinding In die distrik Steytlerville (2 ½ jaar). (b) Die eintlike ondersoekgebied. Onderwysondervinding in Oos-Londen en omgewing (6 jaar) , Grahamstad (10 ½ jaar) afgesien van talle lisensies in Oos-Londen en Port E1izabeth en besoeke aan omliggende dorpe en distrikte.
  • Full Text:
  • Date Issued: 1977

Colour vision of the citrus psylla Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) in relation to alightment colour preferences

  • Authors: Urban, Alan Joseph
  • Date: 1977
  • Subjects: Trioza , Homoptera , Jumping plant-lice , Color vision
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5885 , http://hdl.handle.net/10962/d1013286
  • Description: The colour vision of adult citrus psylla, Trioza erytreae, was investigated in the laboratory using the behavioural parameters: alightment and walking. Light green flushing leaves (under which the nymphs develop) were significantly preferred, visually, to dark green mature leaves for alightment. Diffuse reflectance spectroscopy showed (when expressed in the parameters of human colour vision) that flush has a very slightly longer dominant wavelength, and roughly double the reflectance and purity. Alightrnent frequency correlated almost equally well with "purity" (as noted by Moericke, 1952 et seq., in "yellow-sensitive" aphids) as with the aphidological colour parameter "long/short ratio" developed by Kennedy et al. (1961). Elucidation of the mechanism underlying the citrus psylla's alightment colour preference was initially attempted with a printed spectrum and several paint series of measured spectral characteristics. It was clear that T.erytreae belongs to the "yellow-sensitive" group of Homoptera, but it was impossible to distinguish which pararneter(s) of colour the psyllids were responding to. Phototactic (walking) response to the individual parameters of colour was therefore measured using a monochromator. The phototactic action spectrum (against wavelength) was tri-modal, with peaks in the yellow-green (YG), blue (B), and ultra= violet (UV). Rate of phototaxis was not influenced by bandwidth (roughly equivalent to purity), but was proportional to intensity (roughly equivalent to reflectance). To investigate the influence of the above three wavelength regions on alightment, use was made of a very simple flight chamber incorporating a target of coloured light. Yellow-green and UV light both independently stimulated alightment . Their effect was additive. Different thresholds indicated distinct YG and UV receptor systems. Blue light alone did not stimulate alightment, and was strongly alightment-inhibitory in combination both with YG and with UV light. On the basis of the above physiological/behavioural findings, a new alightment formula was drawn up for describing the hamopteran's apparent manner of alightment determining integration of surface reflectance. The flush preference and alightment distributions on the series of artificial surfaces were found to correlate slightly more accurately, on average, as well as more consistently, with the new formula than with previously-available colour parameters. These findings are placed in perspective to the literature, and their possible economic relevance is discussed.
  • Full Text:
  • Date Issued: 1977

Hugh Tracey memorial service 4

Hugh Tracey memorial service

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