Faculty of Natural Sciences: Recent submissions
Now showing items 581-600 of 2629
-
Nitrogen plasma treatment of zno and tio2 nanowire arrays for polymer photovoltaic applicationS
(ScienceDirect, 2019)This work reports on a simple, yet unique approach to improving the opto-electronic properties of vertically-aligned arrays of rutile TiO2 and Wurzite ZnO nanowires by means of controlled nitrogen doping during exposure ... -
Cold-pressing and vacuum arc melting of γ-tial based alloys
(ScienceDirect, 2019)eta (β) solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al, Ti-48Al-2Nb, Ti-48Al-2Nb-0.7Cr alloys have been cold pressed and vacuum arc melted. The Al loss was due to compaction method used prior to the ... -
Green tea (Camellia sinensis) aqueous extract improved human spermatozoa functions in vitro
(ResearchGate, 2022)Background: Idiopathic causes of infertility is associated with oxidative stress. Antioxidants are known to scavenge the excessive production of reactive oxygen species (ROS). Green tea (Camellia sinensis) contains polyphenols ... -
Epizootic ulcerative syndrome – first report of evidence from South Africa's largest and premier conservation area, the Kruger National Park
(ScienceDirect, 2019)This study reports on the first evidence of genomic material of the causative agent for epizootic ulcerative syndrome (EUS), Aphanomyces invadans, from fish in the Limpopo River system and the Kruger National Park, South ... -
Genetic landscape of the mitochondrial DNA control region in South African populations
(ScienceDirect, 2019)A high-quality dataset of the mitochondrial DNA control region sequences was generated with Sanger and next-generation sequencing. The study was aimed at characterizing the maternal genetic ancestry and analyzing the ... -
Neighbourhood operators: additivity, idempotency and convergence
(Springerlink, 2019)We define and discuss the notions of additivity and idempotency for neighbourhood and interior operators. We then propose an order-theoretic description of the notion of convergence that was introduced by D. Holgate and ... -
Automation of human semen analysis using a novel artificial intelligence optical microscopic technology
(Wiley Online Library, 2019)Current semen analysis still commonly depends on a manual microscopy method in clinical laboratories worldwide. However, some of the major disadvantages of this technique are that it is labour‐intensive, subjective, ... -
Mn nanoparticles encapsulated within mesoporous helical n-doped carbon nanotubes as highly active air cathode for zinc–air batterie
(Wiley Online Library, 2019)The practical application of clean energy conversion and storage technologies, such as fuel cells and metal–air batteries, have been significantly impeded by the high cost and scarcity of precious metal catalysts used for ... -
Forensic science international: genetics supplement series
(ScienceDirect, 2019)We have designed a buffer for preservation of DNA in biological material at room temperature. In this work we evaluated the integrity of DNA from saliva, stored for 4 years and blood stored for 4 months at room temperature. ... -
An in vitro study on the combination effect of metformin and n-acetyl cysteine against hyperglycaemia-induced cardiac damage
(MDPI - Publisher of Open Access Journals, 2019)Chronic hyperglycaemia is a major risk factor for diabetes-induced cardiovascular dysfunction. In a hyperglycaemic state, excess production of reactive oxygen species (ROS), coupled with decreased levels of glutathione, ... -
First record of the water mold achlya bisexualis (saprolegniaceae) isolated from ornamental fish in south africa
(American fisheries society, 2019)The order Saprolegniales (Class Oomycota) is a group of fungus-like eukaryotic microorganisms that have been associated with infections in fish and fish eggs. Infections with microorganisms from this order are clearly ... -
Synthesis, substitution kinetics, DNA/BSA binding and cytotoxicity of tridentate N^E^N (E = NH, O, S) pyrazolyl palladium(II) complexes
(SpringerLink, 2022)The pincer complexes, [Pd(L1)Cl]BF4 (PdL1), [Pd(L2)Cl]BF4 (PdL2), [Pd(L3)Cl]BF4 (PdL3), [Pd(L4)Cl]BF4 (PdL4) were prepared by reacting the corresponding ligands, 2,6-bis[(1H-pyrazol-1-yl)methyl]pyridine (L1), bis[2-(1H-p ... -
Ancient mitogenomics clarifies radiation of extinct mascarene giant tortoises (cylindraspis spp.)
(scientific reports, 2019)The five extinct giant tortoises of the genus Cylindraspis belong to the most iconic species of the enigmatic fauna of the Mascarene Islands that went largely extinct after the discovery of the islands. To resolve the ... -
Strength estimation of evaporitic rocks using different testing methods
(SpringLink, 2019)Rock strength is defined as the limit of the ability of a rock to resist stress or deformation without breaking. Testing methods recommended by ISRM (International Society of Rock Mechanics) and ASTM (American Standards ... -
Shale-gas potential from Cretaceous succession in South Africa’s orange basin: insights from integrated geochemical evaluations
(Taylor & Francis, 2022)Shale sediments were collected from four Cretaceous stratigraphic units across four explorations well locations in South Africa’s Orange Basin and analysed to determine organic-matter characteristics, such as amount, ... -
Exogenous p-coumaric acid improves salvia hispanica l. Seedling shoot growth
(MDPI Open Access Journals, 2019)p-Coumaric acid (p-CA) belongs to a family of natural esters of hydroxycinnamic acid compounds that have been shown to modulate plant growth and metabolism. In this study, we investigated the effect of exogenous p-CA on ... -
Crystal structure, hirshfeld surface analysis and dft studies of 5-(adamantan-1-yl)-3-[(4-chlorobenzyl)sulfanyl]-4-methyl-4h-1,2,4-triazole, a potential 11β-hsd1 inhibitor
(Scientific Reports, 2019)5-(Adamantan-1-yl)-3-[(4-chlorobenzyl)sulfanyl]-4-methyl-4H-1,2,4-triazole (4) was identified as a potential 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) inhibitor and this paper describes the in-depth structural ... -
Comparing galaxy clustering in horizon-agn simulated light-cone mocks and video observations
(Oxford academic, 2019)Hydrodynamical cosmological simulations have recently made great advances in reproducing galaxy mass assembly over cosmic time – as often quantified from the comparison of their predicted stellar mass functions to observed ... -
Mergers, starbursts, and quenching in the SIMBA simulation
(Oxford Academic, 2019)We use the SIMBAcosmological galaxy formation simulation to investigate the relationship between major mergers (4:1), starbursts, and galaxy quenching. Mergers are identified via sudden jumps in stellar mass M∗ well above ... -
Community healthcare mesh network engineering in white space frequencies
(Institute of Electrical and Electronics Engineers, 2019)The transition from analog to digital television has availed new spectrum called white space, which can be used to boost the capacity of wireless networks on an opportunistic basis. One sector in which there is a need to ...