Vol 38 No 1 (2019) | Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i>

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Published: 2020-03-02

Original Research

Karakterisering van Grubbs-tipe-prekatalisatore met behulp van kernmagnetieseresonansiespektrometrie Characterisation of Grubbs-type precatalysts with nuclear magnetic resonance spectrometry

Frans T I Marx, Daniel P Otto, Christo de Lange, Johannes H L Jordaan, Hermanus C M Vosloo

1-13
- Afrikaans
’n Model om Nylkrokodileiers se volumes mee te skat nadat hulle uitgebroei het A model by which to estimate the volume of Nile crocodile eggs after they have hatched

Johan O Nöthling, Johan A Nöthling, Jan G Myburgh

14-25
Beskrywing, modellering en dok-studies van Plasmodium falciparum kinase PfCDPK4 Characterization, modelling and docking studies of Plasmodium falciparum kinase

Thomas Makungo, Tsepo Tsekoa, Anjo Theron, Dalu Mancama, Teunis van Ree

26-40
- Afrikaans
Geografiese ligging beïnvloed vaginale mikrobiese profiele in Suid-Afrikaanse vroue Vaginal microbiota varies by geographical location in South African women

Katie S Lennard, Smritee Dabee, Shaun L Barnabas, Enock Havyarimana, Anna Blakney, Shameem Jaumdally, Gerrit Botha, Nonhlanhla Mkhize, Linda-Gail Bekker, David Lewis, Glenda Gray, Nicola Mulder, Jo-Ann Passmore, Heather Jaspan

41-49
- Afrikaans
- English
Oopbronintelligensie (OSINT) vir veiligheidsdoeleindes: Die ontwikkeling van ’n dataontledingspyplyn om relevante WhatsAppboodskappe te ontleed Open Source Intelligence (OSINT) for security purposes: Developing a data analysis pipeline to analyse relevant WhatsApp messages

Burgert A Senekal, Eduan Kotzé

50-59
- Afrikaans
’n Algemene oorsig van die makroinvertebraatdiversiteit van die Maricorivier, Noordwes Provinsie, Suid-Afrika A general overview of the macro-invertebrate diversity in the Marico River, North-West Province, South Africa

Mathilde Kemp, Victor Wepener, Cornelius T Wolmarans

60-70
- Afrikaans
Die verband tussen broeilingmassa en eiervolume in die Nylkrokodil (Crocodylus niloticus): Eiers se produktiwiteit varieer The relationship between hatchling mass and egg volume in the Nile crocodile (Crocodylus niloticus): The productivity of eggs varies

Johan O Nöthling, Johan A Nöthling, Jan G Myburgh

71-79
- Afrikaans
- English
Suid-Afrikaanse aandelemarkontwikkeling: Die impak van globalisme en nasionalisme South African stock market development: The impact of globalism and nationalism

Cobus Vermeulen, Fanie Joubert, Jannie Rossouw

80-90
- Afrikaans
Oorsig van faseveranderingsmateriaal vir sub-zero temperatuurtoepassings in verkoelingsvervoer Review on phase change materials for sub-zero temperature application in transport refrigeration

Casey Ndanduleni, Zhongjie Huan

91-100
- Afrikaans
- English
Reduksiepotensiaal van β-diketone: Die effek van elektronskenkende, aromatiese en estersubstituentgroepe Reduction potential of β-diketones: Effect of electron donating, aromatic and ester substituent groups

Jeanet Conradie, Nandisiwe G S Mateyise, Marrigje M Conradie

101-118
- Afrikaans
- English
Substituente en isomeriese effekte op die reduksieen oksidasiepotensiaal van tris(β-diketonato) mangaan(III) komplekse: DFT en MESP analises Substituent and isomeric effects on the reduction and oxidation potential of tris(β-diketonato) manganese (III) complexes: DFT and MESP analysis

Adebayo A Adeniyi, Jeanet Conradie

119-133
- Afrikaans
- English
Chloro-karboniel vastetoestand-wanordebepaling in Vaska tipe komplekse Chloro-carbonyl disorder determination in Vaska-type complexes

Alfred Muller

134-142
- Afrikaans
- English
Poli- en isomorfisme in halogeengesubstitueerde 4-(fenielamino)pent-3-en-2-oon verbindings Poli- and isomorphism in halogen-substituted 4-(phenylamino)pent-3-en-2-one compounds

Zanele G Morerwa, Gertruida J S Venter

143-152
- Afrikaans
- English
Oksidatiewe addisie van jodometaan aan Rh(I)- neokupferraatkomplekse as model vir ’n unieke toepassing van Tolman se beginsels Oxidative addition of iodomethane to Rh(I) neocupferrate complexes as model for a unique application of Tolman’s principles

Johan A Venter

153-167
- Afrikaans
Goederevervoermarksegmente wat potensieel winsgewend deur spoorvervoer bedien kan word Freight transport market segments that can potentially be served profitably by rail transport

Wessel J Pienaar

168-179
- Afrikaans
Waargenome struktuur- en reaktiwiteitsverwantskappe in trans-[PtPh(L)2Cl] tydens die verplasingreaksie van Cl- deur I- na verandering van die fosfien-, arsien- en stibienligande (L)† Structure and reactivity relationships in trans-[PtPh(L)2Cl] as observed from Cl- anation by I- upon interchanging phosphine, arsine and stibine (L) ligands

Stefanus Otto, Orbett T Alexander, Andreas Roodt

180-194
- Afrikaans
- English

Conference Abstracts

Identifikasie en beskrywing van ’n onbekende Spinitectus sp. van Clarias gariepinus ingesamel in die Vaaldam, Suid-Afrika Identification and description of a Spinitectus sp. collected from Clarias gariepinus in the Vaal Dam, South Africa

Lucinda Austin, Q M Dos Santos, A Avenant-Oldewage

195
- PDF
59Co KMR vir die studie van die koördinasie en supramolekulêre chemie van Co(III)- komplekse van N,N-dialkiel-N’-asiel(ariel)tioureas 59Co NMR for the study of the coordination and supramolecular chemistry of Co(III) complexes of N,N-dialkyl-N’-acyl(aroyl)thioureas:

Ilse Barnard, Klaus R Koch

196-197
- PDF
Trouelose oorsprongverifikasie van elektroniese intellektuele eiendom deur middel van blokskakeltegnologie (“blockchain technology”) A blockchain application for the trustless provenance verification of electronic intellectual property

Riaan Bezuidenhout, W Nel, A J Burger

198-199
- PDF
Fluoressensiestudies van bindmiddels wat in kunswerke gebruik word Fluorescence studies on binding mediums used in paintings

Loreley Cairns, Patricia Forbes

200-201
- PDF
Die lewensiklus van Meloidogyne enterolobii en ander termofiliese Suid-Afrikaanse Meloidogyne spesies: ’n Vergelykende studie The life cycle of Meloidogyne enterolobii and other thermophilic South African Meloidogyne species: a comparative study

Raymond L Collett, M S Daneel, H Fourie

202
- PDF
Die invloed van melkureumstikstof op reproduksieparameters van melkkoeie in Suid-Afrika The effect of milk urea nitrogen on reproduction parameters of dairy cows in South Africa

Elandri De Bruyn, E C Webb

203
- PDF
Aanpassing- en hanteringstrategieë van bestaansboere in die Richtersveld, Suid-Afrika Coping and adaptation strategies of subsistence farmers in the Richtersveld, South Africa

Shana Diergaardt, M Dyssel

204
- PDF
Toepassing van benoemde entiteitherkenning op die Woordeboek van Suid-Afrikaanse Plekname Application of named entity recognition on the Dictionary of Southern African Place Names

Christiaan Du Plooy, E Kotzé, J Du Plessis

205
- PDF
Distillasie van tetrafluooretileen, heksafluoorpropileen en oktafluoorsiklobutaan by lae temperature Distillation of tetrafluoroethylene, hexafluoropropylene and octafluorocyclobutane at sub-zero temperatures

Johan Espach, P W Sonnendecker, P L Crouse

206
- PDF
Die verband tussen die teenwoordigheid van die visparasiet Lamproglena clariae op die skerptandbaber (Clarias gariepinus) en die waterkwaliteit en metaalkonsentrasies in die Vaalrivier, Suid-Afrika The presence of the fish parasite Lamproglena clariae infecting the African sharptooth catfish (Clarias gariepinus) in comparison to water quality and metal concentration along the Vaal River, South Africa

Marilie Esterhuyze, A Avenant-Oldewage

207
- PDF
Unieke gedragsfenotipes in die hertmuismodel (deer mouse model) van obsessiewe-kompulsiewe siekte en die reaksie daarvan op serotonergiese en dopamienergiese geneesmiddelbehandeling Unique behavioural phenotypes in the deer mouse model of obsessive-compulsive disorder (OCD) and its response to serotonergic and dopaminergic drug treatment

Arina Fick, B H Harvey, De Wet Wolmarans

208-209
- PDF
Doeltreffende identifikasie van poenskop Bonsmaraen Drakensberger- vleisbeeste met behulp van DNS-tegnologie Efficient identification of polled Bonsmara and Drakensberger beef cattle breeds using DNA technology

Rulien Grobler, C Visser, E Van Marle-Köster

210-211
- PDF
Serpinema- (Nematoda: Camallanidae) parasitering van die varswaterskilpad Rhinoclemmys punctularia uit Frans-Guiana Serpinema (Nematoda: Camallanidae) parasitising of the freshwater turtle Rhinoclemmys punctularia from French Guiana

Florence Harnoster, R Svitin, L H Du Preez

212
- PDF
Die Lyapunov-ongelykheid en konveks-inverteerbare keëls The Lyapunov inequality and convex invertible cones

Alma Naudé, S Ter Horst

213
- PDF
Die geologie van ’n gebied in die Kangogroep The geology of an area in the Cango Group

Ryan Nel, A I Odendaal, G J B Germs, H E Praekelt

214
- PDF
Mikrobiologiese kwaliteit en veiligheid van vars produkte: Rede tot kommer? Microbiological quality and safety of fresh produce: Reason for concern?

Loandri Richter, E M Du Plessis, S Duvenhage, L Korsten

215-216
- PDF
Vergelyking van die parasietgemeenskapsamestelling van Xenopus laevis (Anura: Pipidae) tussen gasheerbevolkings regoor die wêreld Comparison of the parasite communities of Xenopus laevis (Anura: Pipidae) across its global distribution

Anneke L Schoeman, L H Du Preez

217
- PDF
Nuwe gasheerstowwe N,N’-bis(9-sikloheksyl-9-xantheniel)etileendiamien en N,N’-bis(9-sikloheksyl-9- tioxantheniel)etileendiamien: ’n Ondersoek na hul insluitingsvermoë Novel host compounds N,N’-bis(9-cyclohexyl-9-xanthenyl)ethylenediamine and N,N’- bis(9-cyclohexyl-9-thioxanthenyl)ethylenediamine: An investigation of their inclusion ability

Ulrich Senekal, B Barton

218-219
- PDF
Die agentifisering van ’n wiskundige probleemgebied vir metaheuristiese ondersoek deur middel van agent-gebaseerde modellering Agentisation of problem domains for agent-based metaheuristic investigation

J A M Simmons, P H Potgieter

220-221
- PDF
Die oriëntering-bepuntingsprobleem: ’n Verkennende studie The orienteering scoring problem: An exploratory study

Willemien Van Hoepen, E G Jones, C J Swanepoel

222-223
- PDF
n-de-magswortels van H-selftoegevoegde matrikse n-th roots of H-selfadjoint matrices

Madelein Van Straaten, F Theron, D B Janse van Rensburg, G J Groenewald, A C M Ran

224
- PDF
Evaluasie van skoner vertaalgeheues Evaluation of cleaner translation memories

Friedel Wolff, L Pretorius, P Buitelaar

225
- PDF
ʼn Ondersoek na die verwantskap tussen die intestinale mikrobioom en ʼn kompulsiewe gedragsfenotipe in die hertmuismodel (deer mouse model) van obsessiewe-kompulsiewe siekte An investigation into the relationship between the intestinal microbiota and a compulsive phenotype in the deer mouse model of obsessive-compulsive disorder

Isma Scheepers, B H Harvey, S M J Hemmings, S Malan-Müller, D W Wolmarans

226
- PDF
Feromone van die denneboom-pou-oogmot Pheromones of the pine tree emperor moth

L Scheepers, B Slippers, M C Bouwer, E R Rohwer

227
- PDF
Sintese en toepassing van ’n nuwe fluoresserende chemosensor wat ’n triasoolielkumarieneenheid bevat Synthesis and application of a novel fluorescent chemosensor containing a triazolylcoumarin unit

S Schoeman, N Mama

228
- PDF
Sintese van silikonkarbied in ’n mikrogolfplasma Synthesis of silicon carbide in a microwave plasma

Jean Van Laar, I J Van der Walt, H Bissett, J C Barry, P L Crouse

226
- PDF

Reviewer Acknowledgements

Erkenning aan evalueerders

231
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