Browsing by Author "Du Plessis, J.L."
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Assessing a portable, real‐time display handheld meter with UV‐A and UV‐B sensors for potential application in personal sun exposure studies
Du Preez, D.J.; Du Plessis, J.L.; Wright, C.Y. (Wiley, 2018)Background Observing accurate real‐time measurements of solar ultraviolet radiation (UVR) levels is important since personal excess sun exposure is associated with skin cancers. Handheld measurement devices may be helpful ... -
Assessment of the occupational exposure to cobalt at a base metal refinery
De Jager, Anri (2015)Objectives: The objectives for this study were (i) to assess the respiratory exposure of base metal refinery workers to cobalt sulphate; (ii) to assess the dermal exposure of these workers to cobalt sulphate; (iii) to ... -
Characterisation of nickel in platinum refining process dust
Nortjé, Renier Louw (North-West University (South Africa) , Potchefstroom Campus, 2016)Objectives: The objective of this mini-dissertation was to determine the physical (particle size) and chemical (species) form of the nickel present in airborne particulate matter at a precious metals smelter. Methods: After ... -
Comparing South African occupational exposure limits for pesticides, metals, dusts and fibres with those of developed countries
Viljoen, Jason Peter (2014)The ever-changing industrial processes which are becoming more globalised as well as the merging of markets in different economies, led to an increased focus on the health and safety of workers in the industries and the ... -
Comparison of airborne particulate exposure in two platinum refining process areas
Selenati-Dreyer, Zoe (North-West University, 2010)The aims and objectives: The aims and objectives of this study were to characterize and compare the airborne particulate matter in the tankhouse and crusher areas of a base metal refinery sampled with two separate methods, ... -
Comparison of South African short-term and ceiling
Maponya, Evelyn Raesetja (North-West University (South Africa) , Potchefstroom Campus, 2015)Occupational exposure limits (OELs) are established with the purpose of regulating exposure to hazardous chemical substance (HCSs) in the workplace. However, the effectiveness of controlling such risks is largely dependent ... -
Dermal and respiratory exposure to cobalt salts in a packaging area of a base metal refinery
Van der Westhuizen, Lélani (North-West University, 2010)Cobalt is a commonly known sensitiser in industrial settings and has been classified by the IARC as a possible group (2B) human carcinogen. Workers at a South African base metal refinery are potentially exposed to cobalt ... -
Dermal and respiratory exposure to nickel in a packaging section of a base metal refinery
Claassens, Hendrik Johannes (2013)Nickel is one of the most commonly known sensitisers and has been classified by the International Agency for Research on Cancer (IARC) as a possible carcinogen to humans (group 2B). Workers at a South African base metal ... -
Dermal exposure and changes in skin barrier function of base metal refinery workers co-exposed to cobalt and nickel
Du Plessis, J.L.; Eloff, F.C.; Engelbrecht, S.; Laubscher, P.J.; Van Aarde, M.N.; Franken, A. (The South African Society of Occupational Medicin, 2013)Refi nery workers are exposed to many metals, including cobalt and nickel, both of which are skin sensitisers, causing allergic contact dermatitis. Dermal exposure, and changes in skin barrier function [skin hydration, ... -
Dermal exposure and skin barrier function of petrochemical workers exposed to polycyclic aromatic hydrocarbons
Linde, Stephanus Johannes Lourens. (North-West University, 2012)Aims and Objectives ? The aim of this study was the following: (1) to assess the dermal exposure of workers to PAH‘s during an entire eight hour work shift; (2) to assess the short term dermal exposure of workers to PAH‘s ... -
Dermal exposure and skin barrier function of workers exposed to copper sulphate at a chemical industry
Steynberg, Christa (2013)Copper exposure is known to be a rare cause of skin irritation and allergic reactions and according to our knowledge occupational dermal exposure to copper sulphate has not yet been characterised. As a result, the objectives ... -
Dermal exposure and surface contamination associated with the use of a cobalt-chrome alloy during additive manufacturing
Paulse, Lynicka Marie (North-West University (South-Africa), 2023)Introduction: Additive Manufacturing (AM) is a layered-based technology that is used to manufacture three-dimensional products from computer-aided design. AM offers many advantages over traditional methods of manufacturing ... -
Dermal exposure to arsenic and lead at a base metals refinery
Stofberg, B. (North-West University (South Africa), 2020)Background: South Africa is the world’s most prominent supplier of platinum group metals. The refining of platinum group metals consists of three main processes namely: smelting, base metal refining and precious metals ... -
Dermal exposure to platinum group metals at a precious metal refinery : a pilot study
Barnard, Marilize (2014)Background: Workers in a platinum group metals (PGMs) refinery are potentially exposed to various precious metals (iridium, osmium, palladium, platinum, rhodium and ruthenium) and their metal-salt compounds which may cause ... -
Development of a framework to assist with risk mitigation in a procurement environment
Brits, Yvette (North-West University, 2007) -
DNA damage and repair capacity in hairdressers exposed to chemical products: a pilot study
Eloff, F.C.; Preston, R.; Pretorius, P.J.; Du Plessis, J.L.; Laubscher, P.J.; Van Aarde, M.N.; Van der Westhuizen, F.H.; Franken, A. (SASOM, 2013)Hairdressers are exposed to numerous hazardous chemical substances, some of which are known or suspected allergens, carcinogens or organic solvents. The objectives of this study were to compare DNA damage and DNA repair ... -
DNA damage and repair detected by the comet assay in lymphocytes of African petrol attendants : a pilot study
Keretetse, Goitsemang Salvation (North-West University, 2007)Petrol attendants are exposed to petrol volatile organic compounds (VOCs) which may have genotoxic and carcinogenic effects. The single cell gel electrophoresis assay (comet assay) is a method highly sensitive to DNA damage ... -
DNA damage and repair detected by the comet assay in lymphocytes of African petrol attendants: a pilot study
Keretetse, G.S.; Laubscher, P.J.; Du Plessis, J.L.; Pretorius, P.J.; Van der Westhuizen, F.H.; Van Deventer, E.; Van Dyk, E.; Eloff, F.C.; Van Aarde, M.N.; Du Plessis, L.H. (Oxford Univ Press, 2008)Petrol attendants are exposed to petrol volatile organic compounds (VOCs) which may have genotoxic and carcinogenic effects. The single-cell gel electrophoresis assay (comet assay) is a method highly sensitive to DNA damage ... -
Electrophysiological effects of fractions isolated from the venom of Parabuthus granulatus on calcium channels in cardiac myocytes
Du Plessis, Lissinda Hester (North-West University, 2004)Scorpion toxins specific for Na+ and K+ channels, have been studied extensively but relatively little has been done on Ca2+ channel toxins. Toxins in the venom of only two South African scorpions P. transvaalicus and P. ... -
Emissions of and exposure to hazardous chemical substances from selected additive manufacturing technologies
Du Preez, Sonette (North-West University (South-Africa), 2019)Background: Additive Manufacturing (AM) is the process of joining feedstock materials one layer at a time in order to produce objects from a three dimensional (3D) computer aided design (CAD). Powder bed fusion (PBF) and ...