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Regression analysis in analytical chemistry. Determination and validation of linear and quadratic regression dependencies

NaudeII ILECO Africa (Pty) Ltd., Kempton Park, Johannesburg, South Africa IIDepartment of Chemistry, University of Pretoria, Hatfield, Pretoria, 0083, South Africa     ABSTRACT Several off-the

Chemistry students

The main objective of the study was to test chemistry students' competence, in the first, second and final years of their BSc course, in some basic problem-solving strategies. Five strategies were ... Chemistry, Heinemann, London, 1982.         [ Links ] 6 J.D. Bransford and B.S. Stein. The Ideal Problem Solver, W.H. Freeman and Co., New York, USA, 1997.         [ Links ] 7 H.S. Fogler and S.E. LeBlanc

Foundation-phase children's causal reasoning in astronomy, biology, chemistry and physics

of Basic Education 2011). Topics from the domains of biology, chemistry, physics and astronomy are therefore formally taught in this phase, expecting children to learn through language, pictures and ... spontaneous development, based on some ad hoc instruction. Some concepts from biology are taught in the foundation phase, but very few concepts from chemistry, physics or astronomy are included in the general

Provisional clinical chemistry parameters in the African Sharptooth catfish (Clarias gariepinus)

baseline clinical chemistry must be defined. Existing data are scarce, and the objective of this work was therefore to establish clinical chemistry parameters for C. gariepinus. Blood was collected from male ... and a number of clinical chemistry parameters were determined. Plasma protein values, but particularly those of plasma albumin, were found to be very low, approximately half the value for dogs, but

An inquiry-based practical curriculum for organic chemistry as preparation for industry and postgraduate research

This paper describes the development of a new practical curriculum for third-year organic chemistry to replace the recipe-based approach typically used in undergraduate teaching laboratories. The new ... . MathabatheII; Marietjie PotgieterI IDepartment of Chemistry, University of Pretoria, South Africa IIDepartment of Science, Mathematics and Technology Education, University of Pretoria, South Africa

Grade 12 achievement rating scales in the new National Senior Certificate as indication of preparedness for tertiary chemistry

There has been much discussion on the impact of the new curricula for Grades 10-12 on the preparedness for tertiary studies of the 2009 cohort in subjects such as mathematics, chemistry and physics ... DavidowitzII IDepartment of Chemistry, University of Pretoria, South Africa IIDepartment of Chemistry, University of Cape Town, South Africa     ABSTRACT There has been much discussion on the impact

Natural products research in South Africa: End of an era on land or the beginning of an endless opportunity in the sea?

South African organic chemistry is deeply rooted in a rich history of natural product chemistry research with the secondary metabolites emanating from South Africa's unique floral kingdoms dominating ... 13: Chemistry in the Marine Environment, (R.E. Hester and R.M. Harrison, eds.), The Royal Society of Chemistry, Cambridge, 2000, pp. 55-79.         [ Links ] 18 M.T. Davies-Coleman, Bioactive natural

Great South African molecules: the case for mycothiol

South Africa has one of the oldest chemical societies in the world and has a long history of natural products, synthetic, and medicinal chemistry yet the visibility of molecules discovered or ... inhibition studies. This review aims to illuminate the scope of research in mycothiol chemistry for the purpose of promoting multidisciplinary investigations related to this South African molecule. Keywords

Teaching, Learning, and Employing Analytical Frameworks as Performance: Analysis of a Quantitative Literacy Event in Applied Mechanics

use this anecdotal example to argue that the application of analytical frameworks is inherently performative in nature, and propose the need for a meta-frame for understanding teaching, learning, and ... : quantitative literacy ,   teaching and learning ,   performativity ,   higher education ,   multimodal social semiotics ,   analytical frameworks   How to Cite: Simpson, Z., & Prince, R. (2018

Potentiometric determination of free chloride in cement paste - An alternative method for low-budget laboratories

has been developed to analyze free chloride in the pore water extracted from cement paste.16 The accuracy and reliability of this analytical technique has been checked against a certified reference ... ; R.I. McCrindleIV; J.H. PotgieterV IDepartment of Chemical & Metallurgical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, 0001 South Africa IIDivision of Chemistry

Organic Acid Metabolism and the Impact of Fermentation Practices on Wine Acidity: A Review

have been made in understanding the biochemistry, ecology, physiology and molecular biology of the various yeast strains involved in wine production, and how these yeasts affect wine chemistry and wine ... years (Son et al., 2009; Van Dorsten et al., 2009; Cuadros et al., 2010; Orellana et al., 2014). Cuadros et al. (2010) provided data demonstrating that unbiased and objective analytical chemistry, in

Tannins and anthocyanins: From their origin to wine analysis - A review

the flavonoid biosynthetic pathway, the translocation thereof from leaves to berries, different methods to extract anthocyanins and tannins from wine and, in the end, the different analytical methods ... conclude with a discussion of the different analytical methods that can be used for the determination of proanthocyanidins and anthocyanins. If a berry from any red cultivar is squeezed, it will be noticed

Characterization of pulverized Marula seed husk and its potential for the sequestration of methylene blue from aqueous solution

potential use of an agricultural waste (Marula seed husk) to decontaminate methylene blue (MB) from aqueous solution. The effect of change in water chemistry was also examined. The influence of basic ... collections:Environmental and Energy Chemistry Abstract Dyes are ranked as an important class of pollutants which affect the aesthetic property of the environment when present even in very low concentrations. This study was

Use of the Chemcatcher® passive sampler and time-of-flight mass spectrometry to screen for emerging pollutants in rivers in Gauteng Province of South Africa

). Passive sampling techniques for monitoring pollutants in water. TrAC, Trends in Analytical Chemistry, 24(10), 845–868.  https://doi.org/10.1016/j.trac.2005.06.006.CrossRefGoogle Scholar Wanda, E. M. M ... analytical column (2.1 i.d. × 100 mm length, 2.2 μm particle size, Thermo Fisher Scientific, Dreieich, Germany) and a Waters VanGuard, Acquity UPLC BEH C18 1.7 μm particle size, (Dublin, Ireland), guard column

Reflections on clinical practice whilst developing a portfolio of evidence: Perceptions of undergraduate nursing students in the Western Cape, South Africa

BACKGROUND: In order to develop clinical judgement, nurses should be encouraged to become analytical and critical thinkers. Development of a portfolio of evidence (PoE) of reflection on clinical ... analytical and critical thinking amongst nursing students. Students' perceptions of the process are important in order to encourage their reflective practice. PoE compilation at a school of nursing at a

Intellectual skills needed for the effective learning and application of chemical knowledge

the results of a study that was done to test first year university students' competence in some types of intellectual skills that are important in chemistry. The skills tested include language skills ... . Chem. Educ., 2008, 85, 381-385.         [ Links ] 8 H.P. Drummond, Students' Competence in the Intellectual Skills and Strategies Needed for Learning South African Matriculation Chemistry Effectively

'Everything is Plastic': The Faith of Unity Movement and the Making of a Post-Catholic Religion in Uganda

religious participation in a contemporary, technology-saturated society. Based on an ethnographic investigation of a new religious movement in Uganda, this essay mobilizes some of the analytical concepts ... history of American religions, some of his analytical tools for understanding these movements could enable the present enterprise of understanding a new religious movement in Africa that has achieved both

An initial assessment of naproxen, ibuprofen and diclofenac in Ladysmith water resources in South Africa using molecularly imprinted solid-phase extraction followed by high performance liquid chromatography-photodiode array detection

characterized with differential scanning calorimetry, X-ray diffraction and zeta potential. The analytical method detection limits for naproxen, ibuprofen and diclofenac in wastewater treatment plant effluent ... Apparatus The analytical standards that were used as templates in MIP synthesis were naproxen (98 %), ibuprofen (>98 %) and diclofenac sodium salt, all purchased from Sigma-Aldrich (Steinheim, Germany). In

Antimicrobial susceptibility profile of uropathogens in Maluti Adventist Hospital patients, 2011

were screened through chemistry and microscopy, then positive urine samples were cultured. The isolated uropathogens underwent antimicrobial susceptibility testing and inclusion continued until 200 ... , Lesotho METHODS: This was a prospective cross-sectional study using consecutive sampling of patients with clinical symptoms of UTI. Midstream urine samples were screened through chemistry and microscopy

Methyl iodide oxidative addition to rhodium(I) complexes: A DFT and NMR study of [Rh(FcCOCHCOCf3)(CO)(pph3)] and the rhodium(III) reaction products

. Conradie; Jeanet Conradie* Department of Chemistry, University of the Free State, Bloemfontein, 9301 South Africa     ABSTRACT A theoretical (DFT) study of the equilibrium geometry of the possible ... .         [ Links ] 52 G.A. Zhurko and D.A. Zhurko, Chem Craft, Version 1.5 (build 275), 2007 (www.chemcraftprog.com).         [ Links ] 53 D.A. Skoog, D.M. West and F.J. Holler, Fundamentals of Analytical