${session.getAttribute("locale")} 5 The development of a cultural family business model of good governance for Greek family businesses in South Africa Wed 30 Mar 2022 14:38:05 SAST ]]> Modeling and measurement of torqued procession in radio pulsars Wed 27 Oct 2021 10:07:08 SAST ]]> Operationally defining sexual orientation : towards the development of a fundamental measure of adolescent sexual responsiveness variations Wed 12 May 2021 23:46:38 SAST ]]> A study of the factors influencing the success of internet marketing in small South African tourism businesses Wed 12 May 2021 23:41:16 SAST ]]> The therapist as a "bad object": the use of countertransference enactment to facilitate communication in therapy Wed 12 May 2021 23:00:39 SAST ]]> Intraspecific comparison of Phanerochaete chrysosporium strains peroxidase production, pollutant degradation and mycelial differentiation 0.05]. These results imply that differences in the biosynthetic pathways for biomass accumulation in sibling strains play a significant role in the intraspecific variation observed in pollutant sensitivity, pollutant degradation, and enzyme production. Categorical analysis of intraspecific differences was assessed according to four criterions. These included growth, extracellular peroxidase activities, tolerance to toxic pollutants and the biodegradation of model pollutants. Sibling strains showing the most variable responses in three or more of the selective criterion were recommended for further studies. These strains include P. chrysosporium ME446, BS 2.52, BS 13, BS 17, BS 18, and BS 24. Interestingly, BS 2.52 (a dikaryotic strain generating from the crossing of two haploid progeny) showed significantly lower degradation capabilities than the wildtype parent strain ME446. The inherited variability observed between sibling strains is to be further explored through proteome and transcriptome analysis and genetic linkage studies aimed at describing the mechanisms or pathways conferring tolerance to or degradation of environmental pollutants. In examining fewer organisms at this next level, the number of replicates examined can be increased and thus the power of detection of experimental procedures improved, enabling the detection of multigenic traits amongst genetically related organisms. Growth was shown to play a significant role in the intraspecific differences detected in pollutant sensitivity and degradation between sibling strains. Little is known about the mechanism of growth and differentiation, or the role of differentiation in regulating the lignolytic activity in this organism. The membrane gradostat bioreactor and a unique plug-flow membrane bioreactor were evaluated as novel tools with which to further explore the relationship between secondary metabolism, pollutant degradation and biofilm development in sibling strains. High yield MnP production at levels as high as 1478.8 U.l-1 was achieved using a laboratory scale membrane gradostat bioreactor. Furthermore, extensive mycelial differentiation and tissue formation are reported for P. chrysosporium in both the membrane gradostat bioreactor and plug-flow membrane bioreactor. Intraspecific differences in the extent of this differentiation were observed in strains ME446, BS 13, BS 17 and BS 26 cultured using the membrane gradostat bioreactor, highlighting the potential of these techniques as a platform for future strain improvement strategies.]]> Wed 12 May 2021 22:17:57 SAST ]]> International relations and change: a Kuhnian interpretation Wed 12 May 2021 20:59:35 SAST ]]> Photophysical and photochemical studies of non-transition metal phthalocyanine derivatives Wed 12 May 2021 20:55:52 SAST ]]> Biology, population dynamics and management of carpenter (Argyrozona argyrozona) an endemic South African reef fish Wed 12 May 2021 20:14:05 SAST ]]> Towards the development of a protocol for the selection of probiotics in marine fish larviculture Wed 12 May 2021 19:26:40 SAST ]]> The assessment and management of bycatch and discards in the South African demersal trawl fishery Wed 12 May 2021 19:16:01 SAST ]]> Environmental policy processes surrounding South Africa's plastic bags regulations : tensions, debates and responses in waste product regulation Wed 12 May 2021 18:33:25 SAST ]]> The early proterozoic Makganyene glacial event in South Africa : its implication in sequence stratigraphy interpretations, paleoenvironmental conditions and iron and manganese ore deposition Wed 12 May 2021 18:14:11 SAST ]]> A history of the direct taxation of the African people of Kenya, 1895-1973 Wed 12 May 2021 18:12:28 SAST ]]> The life history patterns of the polychaete, Terebrasabella heterouncinata, a pest of cultured abalone Wed 12 May 2021 17:50:26 SAST ]]> An investigation into the pharmacological properties of propolis Wed 12 May 2021 17:47:39 SAST ]]> Fishing rights, redistribution and policy : the South African commercial T.A.C. fisheries Wed 12 May 2021 17:39:38 SAST ]]> The biophysical dynamics of the Lower Shire River Floodplain fisheries in Malawi 1, it was asserted that both O. mossambicus and C. gariepinus were mortality-dominated and fairly heavily exploited. However, potential for sustainable exploitation existed since both species showed signs of resilience due short longevity and high rate of natural mortality. Given the limitation of simple exponential models of fish mortality and growth under the situation of seasonal fluctuation of water levels, a simple predictive hydroclimatic- fisheries model was developed. The model predicted the life-history and production parameters fairly accurately (0.53 ≤ r² ≥ 0.98, p ≤ 0.05), and showed that environmental and biological events in the floodplain significantly (0.43 ≤ r² ≥ 0.91, p ≤ 0.05) followed the periodic function of time (day-of-the-year), hence, strongly seasonal. In addition, the flood-pulse preceded all the major biological events, with predicted phase lags established at 55.6º for peak flood, 157.2º, 260.1º, 334.6º and 341.4º for condition factor for O. mossambicus, recruitment, spawning period for O. mossambicus and C. gariepinus, respectively. Therefore, it was recommended that water obstruction on the Shire River must ensure sufficient water flow during the peak flood and spawning period to allow flooding and inundation of the floodplain in order to create habitat favourable for spawning and feeding as well as improve recruitment.]]> Wed 12 May 2021 17:32:49 SAST ]]> Material characterisation of laser formed dual phase steel components Wed 12 May 2021 17:31:11 SAST ]]> Isolation and characterization of a novel thermostable and catalytically efficient laccase from Peniophora sp. strain UD4 Wed 12 May 2021 17:15:50 SAST ]]> Enabling reflexivity and the development of reflexive competence within course processes: a case study of an environmental education professional development course Wed 12 May 2021 16:25:23 SAST ]]> The development of motivational strategies for public sector workers in Kenya Wed 12 May 2021 16:23:56 SAST ]]> Contending issues in South Africa's foreign policy : universalism versus economic national interest : the case of South Africa's arms sales to 'pariah states' 1994-1999 Wed 12 May 2021 15:58:44 SAST ]]> The development of best practice guidelines for the contingency management of health-related absenteeism in the motor manufacturing industry Thu 13 May 2021 10:32:55 SAST ]]> An investigation into the neuroprotective properties of acetylsalicylic acid and acetaminophen Thu 13 May 2021 10:28:35 SAST ]]> Characterization of the hydantoin-hydrolysing system of Pseudomonas putida RU-KM3s Thu 13 May 2021 08:52:34 SAST ]]> An intersubjective perspective on the role of personal therapy in being a psychotherapist Thu 13 May 2021 08:46:54 SAST ]]> Impacts of wildlife and cattle grazing on spider (araneae) biodiversity in a highland savanna ecosystem, in Laikipia, Central Kenya Thu 13 May 2021 07:16:42 SAST ]]> African mead biotechnology and indigenous knowledge systems in iQhilika process development Thu 13 May 2021 07:14:41 SAST ]]> Synthesis and electrocatalytic properties of polymerizable metallophthalocyanines Thu 13 May 2021 07:13:40 SAST ]]> A phenomenological investigation into lecturers' understanding of themselves as assessors at Rhodes University Thu 13 May 2021 06:39:27 SAST ]]> Access to land as a human right the payment of just and equitable compensation for dispossessed land in South Africa Thu 13 May 2021 06:37:43 SAST ]]> The oxidative coupling of phenols using stoichiometric metal oxidants Thu 13 May 2021 06:35:34 SAST ]]> The nature and potential of industrial development within the Southern African Development Community (SADC) and the facilitating role of trade liberalisation and foreign direct investment in selected countries Thu 13 May 2021 05:50:53 SAST ]]> An investigation into the antidepressant activity of hypericum perforatum Thu 13 May 2021 05:42:51 SAST ]]> On the growth and characterisation of AIGaN alloys for optoelectronic applications 0.3. The possibility that Si could become a DX-centre in AlxGa1-xN was then investigated. However, Hall effect measurements showed that the Si activation energy increased in good agreement with the model of a shallow effective mass state donor, with no sudden increase in ED being observed up to x = 0.4. It was then suggested that the increase in the E1 and E2 activation energies, as well as the exciton localisation energies, could be due to the 9 7 valence band crossover, which occurs at roughly the same composition. However, due to the scarcity of reports on the valence band structure in AlxGa1-xN no conclusions could be made at this stage as to the effect of the 9 7 valence band crossover on the PL properties of AlxGa1-xN.]]> Thu 13 May 2021 05:42:11 SAST ]]> Rainfall variability in Southern Africa, its influences on streamflow variations and its relationships with climatic variations Thu 13 May 2021 05:37:21 SAST ]]> Re-inventing educational leadership for school and community transformation: learning from the Educational Leadership Management and Development programme of the University of Fort Hare Thu 13 May 2021 05:33:14 SAST ]]> Fractured solidarities: labour regulation, workplace restructuring, and employment 'flexibility' in Namibia Thu 13 May 2021 05:29:53 SAST ]]> Virtuous living towards an African theology of wisdom in the context of the African renaissance Thu 13 May 2021 04:10:56 SAST ]]> Metalorganic vapour phase epitaxial growth and characterisation of Sb-based semiconductors Thu 13 May 2021 04:10:03 SAST ]]> Supervision : a Foucaultian exploration of institutional and interpersonal power relations between postgraduate supervisors, their students and the university domain Thu 13 May 2021 03:30:24 SAST ]]> The degradation of lignocellulose in a biologically-generated sulphidic environment Thu 13 May 2021 03:09:31 SAST ]]> The status and natural history of pygmy (Kogia breviceps) and dwarf (K. sima) sperm whales off Southern Africa Thu 13 May 2021 02:57:41 SAST ]]> The design and evaluation of a short-term group psychotherapy model for survivors of a first myocardial infarction Thu 13 May 2021 02:51:06 SAST ]]> Ligand isotope vibrational spectroscopic and DFT studies of Pt(II) and Cu(I) complexes Thu 13 May 2021 02:43:41 SAST ]]> The development of an electrochemical process for the production of para-substituted di-hydroxy benzenes Thu 13 May 2021 02:38:45 SAST ]]> A commercial process development for plant food formulation using polyprotic acids from natural extracts as chelating agents 99.9 % certainty) potential in two of the semi-organic mixtures formulated while the organic mixture showed a relatively good growth rate as compared to the control (pure tap water). According to statistical analysis (ANOVA) comparison, two of the semi-organic mixtures performed considerably better than the two commercial samples evaluated. Potential benefits profoundly associated with these nutrient mixtures as compared to similar liquid fertilizer products on the market is that most nutrients are chelated and dissolved in solution. Also, the mixtures contain all necessary nutrients including plant growth substances required for healthier plant growth. The most important socioeconomic impact is the value addition to the technology chain in the citrus industry. The use of fluid fertilizers in significant quantities is less than twenty years old. Nevertheless, growth has been so rapid that in South Africa demand for mixed liquid fertilizer has greatly increased from 90 000 tons NPK & blended micronutrients in 1955 to more than 600 000 per annum tons today (Report 41/2003, Department of Minerals and Energy). The liquid fertilizers market is sparsely specialized with major competitors like Omnia, Kynoch and Foskor supplying more than 50 % of the market demand. Amongst the nutrient mixtures formulated, mixture one is an NPK (1-1-2) based nutrient mixture containing both secondary nutrients (0.5 % Mg & 1.0 % Ca) and seven micronutrients (0.1 % Fe, 0.05 % Cu, 0.05 % Zn, 0.05 % Mn, 0.02 % B, 0.0005 % Mo and 0.0005 % Co). The composition of this mixture offers the formula a potential to be used as a general purpose (all stages of plant growth) fertilization mixture in view of its balanced composition (containing all essential plant nutrients). Mixture two contains essentially the micronutrients and in higher concentrations (0.3 % Fe, 0.3 % Cu, 0.1 % Zn, 0.2 % Mn, 0.02 % B, 0.0005 % Mo and 0.0005 % Co) as compared to mixture one except for boron, molybdenum and cobalt. The concentration of the micronutrients contained in this mixture is adequately high which offers a potential for it to be used in supplementing nutrition in plants with critical micronutrient-deficient symptoms. Mixture three is very similar to mixture two (1.0 % Fe, 0.05 % Cu, 0.05 % Zn, 0.05 Mn, 0.05 % B, 0.0005 % Mo and 0.0005 % Co) except that the concentrations of all seven micronutrients are considerably less than those of contained in mixture two. However, the concentration of iron in this mixture is as high as 1.0 %. The mixture has a potential to be used in high iron-deficient situations. Mixture four is an organic formula with relatively low nutrient concentrations (NPK-0.02-0.02-1, 0.27 % Mg, 0.02 % Ca, 0.008 % Fe, 0.26 % Cu, 0.012 % Zn, 0.009 % Mn). Nevertheless, this mixture is appealing for organically grown crops where the use of chemicals is prohibited by standards. These lemon juice-based nutrient mixtures were further characterized and tested for stability and storability over a period of eight weeks. This study revealed no major change in the physical quality (colour, pH and “salt out” effect). The basic formulation methodology is a two-step procedure that involves filtration of the lemon juice to remove membranous materials, mixing at ambient temperature and stabilization of the nutrient mixtures. However, for the organic nutrient formula mix, filtration follows after extraction of nutrients from plant materials using the lemon juice.]]> Thu 13 May 2021 01:15:13 SAST ]]> The anatomy and distribution of the cyperaceae in the Eastern Cape region of South Africa Thu 13 May 2021 00:20:07 SAST ]]>