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AFRIKAANSE OPSOMMING: Garsmout is wêreldwyd die oorheersende roumateriaal vir bier brou. Om die aanvraag van verbruikers te bevredig, word 'n konstante hoë gehalte mout produk vereis. Die kwailiteit van mout word bepaal deur die graad van substraathidrolise gedurende ontkieming, wat dien as fermenteerbare substraat vir alkoholiese fermentasie tydens verbrouing. Dit is dikwels moeilik om ʼn konstante, hoë gehalte, moutproduk te lewer as gevolg van variasie in mout en die swak ontkiemingsvermoë van dormante gars. Hierdie probleem kan oorbrug word met eksterne toevoegings soos chemikalieë en gibberelliensuur, maar dit is nie ʼn gewensde praktyk in die broubedryf nie. Vermouters is gevolglik gedurig op soek na alternatiewe oplossings.
Mikroörganismes produseer diverse ensieme wat kan bydra tot substraathidrolise gedurende ontkieming. Die on...
AFRIKAANSE OPSOMMING: Volledige skeiding van die verbindings in 'n komplekse mengsel is selfs met kapillêre
gaschromatografie nie altyd moontlik nie. Oor die afgelope paar dekades is verskillende
tweedimensionele gaschromatografiese tegnieke ontwikkel om hierdie probleem te bowe
te kom en redelik onlangs is 'n tegniek bekend gestel wat as omvattende
tweedimensionele gaschromatografie bekend staan en wat die piekkapasiteit van 'n
kapillêre gaschromatografiese skeiding teoreties met sowat twee ordegroottes kan
verhoog. Hierdie tegniek berus op die aanwending van die verskillende
skeidingsmeganismes van twee chromatografiese kolomme wat aan mekaar gekoppel
word en waardeur verbeterde skeiding van komplekse mengsels verkry kan word.
Hierdie tegniek kan egter slegs as omvattende tweedimensionele gaschromatografie
beskou word as d...
Full text to be digitised and attached to bibliographic record.
In many industrial fermentation processes, Saccharomyces cerevisiae yeast should ideally meet two partially conflicting demands. During fermentation a high suspended yeast count is of paramount importance to maintain a rapid fermentation rate, whilst efficient flocculation should ideally be initiated only on completion of the primary alcoholic fermentation, so as to enhance product clarification and recovery. Most commercial wine yeast strains are non-flocculent, probably because this trait was counter-selected to avoid fermentation problems. In this study, we assessed molecular strategies to optimise the flocculation behaviour of non-flocculent laboratory and wine yeast strains. For this purpose, the chromosomal copies of three dominant flocculation genes, FLO1, FLO5 and FLO11, of a non-flocculent S. cerevisiae laboratory strain (FY23...
AFRIKAANSE OPSOMMING: geen opsomming
This study project sets out to examine the validity of an idea - an idea to create a
study-abroad programme complemented by combining studies with mission work
for Christian university undergraduates. In support of this idea, this study
researches the overwhelming arguments that would validate the programme.
The study then looks into how the programme can be designed and what its
desired focus should be.
In this study, the author first examines the prominent external forces that justify
the programmes' needs. Two prominent forces include the lack of valued, quality
leadership roles in today's business community, as well as the coming of a more
integrated world where business managers must gain the skills to transact
beyond borders. These two forces become the focal point of the education
component, while the last external is...
ENGLISH ABSTRACT: This study investigates the efforts of stakeholders in a regional innovation system (RIS) to reconstruct the system to enable the development of the nascent biotechnology industry in the Western Cape province of South Africa. Various institutions and organisations played a crucial role in effecting these changes. One of the most important changes involved legislation that altered the role that universities play in bridging the gap between research outputs and reaping commercial benefits from such outputs. Following the logic of the regional innovation system, the study focused on the institutional changes, the mechanisms employed to bridge this gap (from creating spin-off firms, and licensing technologies based on university research, to designing programmes to support the development of bio-entrepreneurs). For a comp...
AFRIKAANSE OPSOMMING: Kruising-simmetrie beskryf ’n verband tussen verstrooiings- en vernietigingsprosesse. Die
afleiding daarvan binne die raamwerk van steuringsteorie is eenvoudig: dit behels bloot die
omruil van ingaande en uitgaande toestande in die Feynman-diagram. In soliton-modelle
is die situasie egter meer ingewikkeld aangesien die verstrooiings- en vernietigingsprosesse
in verskillende topologiese sektore plaasvind wat nie deur kontinue transformasies aan
mekaar gekoppel is nie.
In hierdie tesis word daar van ’n eenvoudige soliton-model gebruik gemaak om hierdie
probleem numeries te ondersoek. Eerstens word die faseverskuiwing van die verstrooiingsproses
van ’n golfpakkie vanaf ’n kinkoplossing asimptoties in die topologiese eenheidssektor
bepaal. Vir hierdie doel word die tydafhanklike bewegingsvergelykings van
die...
Thesis (MEng)--Stellenbosch University, 2015.
