Browsing Natural and Agricultural Sciences by Title
Now showing items 2206-2225 of 2708
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A radio and near-infrared study of 6.7 GHz methanol maser sources
(North-West University, 2004)The 6.7 GHz 51 - 60 A+ methanol maser transition was discovered relatively recently, in 1991. The exact nature of these masers is not known to date, but it seems likely that they are closely associated with high mass stars ... -
Radioactive soil contamination from the coastal towns of Walvis Bay and Swakopmund in the vicinity of uranium mine sites of Erongo region, Namibia
(North-West University (South Africa), 2015)Radioactive soil contamination is one of the major causes of external gamma rays exposure in many places including the coastal towns of Walvis Bay and Swakopmund in the Erongo region of Namibia. Gamma radiation emitted ... -
Radioecological modelling of naturally occuring radiation at the Morupule-B Coal Thermal Power Station.
(North-West University (South Africa), 2020)The study was performed around the Morupule-B Coal Power Station in the central district of Botswana. A total of 99 water, soil, coal, bottom ash as well as fly ash samples were collected from the study area. Coal, bottom ... -
Radiometric risk assessment of naturally occurring radioactive materials in the proposed radioactive waste storage area of Pilikwe, Botswana
(North-West University (South Africa), 2021)Determination of natural occurring radioactive material concentrations followed by the radiological risk assessment were conducted for the radioactive waste storage facility to be constructed at Pilikwe village of Central ... -
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Radionuclide and heavy metal contamination of drinking water sources in the Wonderfonteinspruit catchment, South Africa
(North-West University (South Africa), 2012)The Wonderfonteinspruit (WFS) catchment is home to thousands of people, amongst them a significant number of informal settlement inhabitants, which largely rely on the Wonderfonteinspruit for domestic consumption on a daily ... -
Radionuclides and heavy metals concentrations in particulate matter around uranium and gold mining towns of Erongo region, Namibia
(North-West University (South Africa), 2020)The aim of the study was to measure the activity concentrations of naturally occurring radioactive materials (NORM) and these are: 226Ra, 210Pb , 238U, 232Th and 40K and levels of toxic heavy metals in particulate matter ... -
Radionuclides and toxic elements transfer from the Princess Dump to the surrounding vegetation in Roodepoort South Africa : potential radiological and toxicological impact on humans
(North-West University (South Africa), 2014)South Africa is a mining country, and one of the leading gold mining countries in the world. Mining activities tend to bring other minerals and elements to the surface in addition to the desired mineral. In gold mining, ... -
RAPD Delineation of Native Bacillus spp. and Analyses of Their Biocontrol Effect on Tomato Fusarium Wilt
(North-West University, 2013)Tomato (Lycopersicon esculentum mill) is a very important vegetable crop and easily susceptible to fungal diseases such as Fusarium wilt which is caused by Fusarium solani. The use of biocontrol can be used to ameliorate ... -
Re-assessment and optimisation of an organic acid extraction method for automation
(North-West University (South Africa), Potchefstroom Campus, 2017)Sample preparation is a necessary prerequisite for GC/MS analysis of urinary organic acids for clinical diagnosis of inborn errors of metabolism (IEM). The sample clean-up step in the analytical process poses a challenge. ... -
Re-defining the aspects of transport safety regulations (TS-R-1) for the transport of bulk material
(North-West University (South Africa), 2006)Transport of radioactive material is an essential activity worldwide. Both safety and security during transport are matters of international importance. The IAEA Safety Standard (ST-R-1) has been adopted worldwide for ... -
Reactions of phloroglucinols with radical species, a theoretical study in different media
(North-West University (South Africa), 2020)A theoretical study on the reactions of phloroglucinol (FG) and phloroacetophenone (THAP) with •OH and •OOH has been performed through hydrogen atom transfer (HAT), single electron transfer-proton transfer (SET-PT), ... -
Reactive molecular dynamics simulations of the surface interactions between atomic oxygen and poly(2,5)benzimidazole carbon nanotube composite
(North-West University (South Africa), 2023)The low Earth orbit (LEO) environment is home to many species, of which atomic oxygen (AO )is the most abundant. AO is formed via the photo-disassociation of molecular oxygen by solar radiation. In the LEO environment, AO ... -
Reclaiming nature in cities : an economic valuation approach across the socio-economic gradient in Potchefstroom
(North-West University (South Africa), 2021)Nature is essential to urban quality of life, yet urban green spaces (UGSs) are continuously competing with other land-uses with explicit monetary contributions to the city economy. Indeed, the economic benefits delivered ... -
The recombinant expression and enzymatic charaterisation of human ACSM2 ligase.
(North-West University (South Africa), 2023-10)Glycine conjugation is a highly conserved Phase 2 biotransformation reaction for xenobiotic carboxylic acids such as benzoate, salicylate, and medium-chain fatty acids. The glycine conjugation pathway can be saturated by ... -
Recombinant expression and functional characterisation of a putative clathrin assembly protein from arabidopsis thaliana
(North-West University (South Africa), 2015)The need to develop agricultural crops with persistent resistance to the vagaries of climate change has led plant biotechnologists to strategically focus on those plant molecules involved in the maintenance and sustenance ... -
Recombinant expression and functional characterization of a fusion F-box protein from A. thaliana
(North-West University (South Africa), 2012)Adenylate cyclases (A Cs) are enzymes that are capable of converting adenine-5'-triphosphate (ATP) to cyclic 3', 5'-adenosine monophosphate (cAMP). It has been found that cAMP has an important role in cell signalling and ... -
Recombinant expression and functional characterization of a G3-family protein from Arabidopsis thaliana
(North-West University (South Africa), 2016)Adenylate cyclases (ACs) are a diverse group of enzymes, which catalyze the formation of 3ʹ,5ʹ cyclic adenosine monophosphate (cAMP) from adenosine 5ʹ-triphophate (ATP). Cyclic AMP is a key secondary messenger known to be ... -
Recombinant expression and functional characterization of a novel toll interleukin receptor nucleotide-binding site leucine-rich repeat protein from arabidopsis thaliana
(North-West University (South Africa), 2012)The presence of adenylate cyclases in higher plants has generally been questioned. A BLAST search of the Arabidopsis genome using a 14-amino acid motif with specificity for ATP binding bioinformatically identified the ... -
Recombinant expression and functional characterization of a putative pentatrico-peptide protein from Arabidopsis thaliana
(North-West University (South Africa), 2012)Food security appears to be heavily dependent on the development of crop plants with increased resistance to both biotic and abiotic stresses such as pathogen infections and droughts respectively. Plant biotechnology has ...