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Now showing items 2515-2534 of 4834

Label-free detection of mutations in the HIV genome using a surface plasmon resonance biosensor

Author: Lugongolo, Masixole Y ; Manoto, Sello L ; Maphanga, Charles P ; Ombinda-Lemboumba, Saturnin ; Thobakgale, Setumo L ; Mthunzi-Kufa, Patience Date: Mar 2021 Surface plasmon resonance (SPR) biosensors are optical materials that measure changes in the refractive index as they monitor non-covalent molecular interactions in real time. These utilise a label free analytical approach, which does not ... Read more
Label-free differentiation of human immunodeficiency virus-1 infected from uninfected cells using transmission measurement

Author: Malabi, Rudzani ; Lugongolo, Masixole Y ; Thobakgale, Setumo L ; Manoto, Sello L ; Mthunzi-Kufa, Patience ; Ombinda-Lemboumba, Saturnin Date: Feb 2019 Transmission measurement has been perceived as a potential candidate for label-free investigation of biological material. It is a real-time, label-free and non-invasive optical detection technique that has found wide applications in pharmaceutical ... Read more
LaBO3 (B¼ Fe, Co) nanofibers and their structural, luminescence and gas sensing characteristics

Author: Shingange, Katekani ; Swart, HC ; Mhlongo, Gugu H Date: Feb 2020 Perovskite based oxides provide various compositional combinations between different oxides for tuning gas sensing performances. Herein, we present lanthanum based perovskites (LaFeO3 and LaCoO3) nanofibers (NFs) synthesized through the ... Read more
Laboratory assessment of the influence of the proportion of waste foundry sand on the geotechnical engineering properties of clayey soils

Author: Mgangira, Martin B Date: 2006 Soil improvement can be achieved through mechanical stabilisation using industrial byproducts. Clayey soils were blended with waste foundry sand to examine its influence on the geotechnical engineering properties of the soils. The waste foundry ... Read more
A laboratory based exposure of Microcystis and Oscillatoria cyanobacterial isolates to heterotrophic bacteria

Author: Ndlela, Luyanda L ; Oberholster, Paul J ; Van Wyk, JH ; Cheng, Po Hsun Date: Apr 2019 Biological control of cyanobacteria is a viable means of controlling nuisance bloom occurrences; however the majority of studies done are against Microcystis sp., with a commonly lytic effect caused. Filamentous cyano-bacteria such as ... Read more
Laboratory performance and modelling behaviour of hot-mix asphalt with recycled crushed glass

Author: George, Theresa B ; Anochie-Boateng, Joseph ; Jenkins, KJ Date: Sep 2020 In South Africa research is currently under way to determine the suitability of using locally available recycled crushed glass as a partial fine aggregate substitute in the production of asphalt mixes. This paper characterises the laboratory ... Read more
A Laccase-catalysed one-pot synthesis of aminonaphthoquinones and their anticancer activity

Author: Wellington, Kevin W ; Kolesnikova, NI Date: May 2012 Nuclear monoamination of a 1,4-naphthohydroquinone with primary aromatic amines was catalysed by the commercial laccase, Novozym 51003, from Novozymes to afford aminonaphthoquinones. The synthesis was accomplished by reacting a mixture of the ... Read more
A laccase-catalysed synthesis of triaminated cyclohexa-2,4-dienones from catechol

Author: Wellington, Kevin W ; Govindjee, Varsha P ; Steenkamp, Paul Date: Dec 2018 A commercial laccase, Suberase from Novozymes, catalyses the synthesis of triaminated cyclohexa-2,4-dienones and a methylbenzene-1,2-diol derivative. The primary amine (analine) and the catechol was reacted under mild conditions (40C) in a ... Read more
Laccase-catalyzed C-S and C-C coupling for a one-pot synthesis of 1,4-naphthoquinone sulfides and 1,4-naphthoquinone sulfide dimers

Author: Wellington, Kevin W ; Gordon, GER ; Ndlovu, LA ; Steenkamp, P Date: Jun 2013 Oxidative C-S and C-C bond formation with aryl and alkyl thiols was catalyzed under mild conditions in a reaction vessel open to air at pH 4.5 in the presence of a commercial laccase (Novozym 51003 or Suberase) and a cosolvent (DMF) to afford ... Read more
LAM additive manufacturing: A fundamental review on mechanical properties, common defects, dominant processing variables, and its applications

Author: Sibisi, TH ; Shongwe, MB ; Tshabalala, Lerato C ; Mathoho, Ipfi Date: Aug 2023 A cutting-edge manufacturing technology that uses powder or wire as the feeding material and a high-energy heating source is known as metal additive manufacturing (AM). High-performance components for automotive, aerospace, medical, and energy ... Read more
Land Cover Change Detection Using Autocorrelation Analysis on MODIS Time-Series Data: Detection of New Human Settlements in the Gauteng Province of South Africa

Author: Kleynhans, Waldo ; Salmon, Brian P ; Olivier, JC ; Van den Bergh, Frans ; Wessels, Konrad J ; Grobler, Trienko L ; Steenkamp, Karen C Date: 2012 Autocorrelation Change detection MODIS Timeseries Read more
Land cover change detection using the internal covariance matrix of the extended kalman filter over multiple spectral bands

Author: Salmon, Brian P ; Kleynhans, Waldo ; Van den Bergh, Frans ; Olivier, JC ; Grobler, TL ; Wessels, Konrad J Date: Jun 2013 In this paper, the internal operations of an Extended Kalman Filter is investigated to observe if information can be derived to detect land cover change in a MODerate-resolution Imaging Spectroradiometer (MODIS) time series. The concept is ... Read more
Land cover change in the Kruger to Canyons Biosphere Reserve (1993-2006): a first step towards a conservation plan for the subregion

Author: Coetzer, KL ; Erasmus, BFN ; Witkowski, ETF ; Bachoo, AK Date: Jul 2010 This paper is a first step towards a conservation plan for the Kruger to Canyons Biosphere Reserve (K2C) on the South African Central Lowveld, quantifying the historical land-cover trends (1993-2006). During the analysis period, 36% of the ... Read more
Land tenure conflict and agribusiness development in sub-Saharan Africa

Author: Effossou, KA ; Cho, Moses A Date: Jun 2021 There is a growing demand of land by multinational commercial agribusinesses to meet the increasing demand for food in sub-Saharan Africa (SSA) and the export market. Land tenure system is identified as one of the factors stymieing the growth ... Read more
Land use land cover change and the comparative impact of co-management and government-management on the forest cover in Malawi (1999-2018)

Author: Goede, MF ; Cho, Moses A ; Chirwa, W ; Geldenhuys, CJ Date: Jan 2020 Miombo Woodland is the major Land use/land cover with important ecological functions in Africa. In Malawi, government-management was designed to manage Woodlands. However, when illegal activities continued, Participatory Forest Management ... Read more
Land-cover changes in South Africa 1911-1993

Author: Biggs, R ; Scholes, RJ Date: Sep 2002 The area under cultivation in South Africa more than tripled during the twentieth century, while plantation area increased more than tenfold. These land covers now constitute 12% and 1.5%, respectively, of the country's surface area. This ... Read more
Land-cover separability analysis of MODIS time-series data using a combined simple harmonic oscillator and a mean reverting stochastic process

Author: Grobler, TL ; Ackermann, ER ; Olivier, JC ; Van Zyl, AJ ; Kleynhans, W Date: Jun 2012 It is proposed that the time series extracted from moderate resolution imaging spectroradiometer satellite data be modeled as a simple harmonic oscillator with additive colored noise. The colored noise ismodeled with an Ornstein–Uhlenbeck ... Read more
Landsat-8 based coastal ecosystem mapping in South Africa using random forest classification in Google Earth Engine

Author: Bessinger, M ; Lück-Vogel, Melanie ; Skowno, A ; Conrad, F Date: Nov 2022 Coastlines worldwide are home to an increasing number of people and are subject to many pressures. This, combined with natural dynamics and hazards, often results in the degradation of coastal and marine ecosystems and infrastructure. Therefore, ... Read more
Landscape and opportunities for active pharmaceutical ingredient manufacturing in developing African economies

Author: Riley, DL ; Strydom, I ; Chikwamba, Rachel K ; Panayides, Jenny-Lee Date: 2019 Africa is one of the world's fastest growing economies, with South Africa having the fifth highest worldwide pharmaceutical expenditure per capita. In recent years, several companies have considered regional pharmaceutical production but have ... Read more
Landscape fragmentation in South Coast Renosterveld, South Africa, in relation to rainfall and topography

Author: Kemper, J ; Cowling, RM ; Richardson, DM ; Forsyth, GG ; McKelly, DH Date: Apr 2000 The South Coast Renosterveld has been fragmented extensively by agriculture. The extent of this fragmentation in terms of overall habitat loss, fragment sizes and fragment numbers has not been described previously, thereby limiting the ... Read more

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