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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

Structure of coordination complexes: The synergy between NMR spectroscopy and computational chemistry

Illustrative examples of how NMR spectroscopy and computational chemistry data can be used in synergy to gain information on structure, coordination mode, bonding, symmetry and isomeric distribution ... . Malenfant, J. Naud, W.W. Ogilvie, J. O'Meara, P.W. White and C. Yoakima, Bioorganic & Medicinal Chemistry, 2007, 15, 2690.         [ Links ] 4 R. Annunziata, L. Raimondi, G.M. Nano, G. Palmisano and S

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

Reverse transcription recombinase polymerase amplification assay for rapid detection of canine associated rabies virus in Africa

, we describe the developed of a reverse transcription recombinase polymerase amplification assay for the detection of rabies virus. The analytical sensitivity of this assay was determined to be 562 RNA ... ) that was verified with calculation of the second derivative. RT-RPA assay characteristics. The analytical sensitivity of the RT-RPA assay was determined by testing serially diluted in vitro transcribed

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

Morbidity after surgical management of cervical cancer in low and middle income countries: A systematic review and meta-analysis

-effects meta-analytical models were used to calculate pooled estimates of surgical complications including blood transfusions, ureteric, bladder, bowel, vascular and nerve injury, fistulae and

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


Pedro de Montes de Oca, 2060, San José, Costa Rica ABSTRACT Despite the widespread notion amongst chemistry educators that the laboratory is essential to learn chemistry, it is often a ... a subject of debate for much of college chemistry education history. Already in 1929, Havighurst1 put forth his visionary proposal of shifting away from a curriculum and instructional approach that

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

Concepción de la identidad química en estudiantes y profesores de química: Parte I - La identidad química como base del concepto macroscópico de sustancia

The value of the concept of substance, both in its theoretical and phenomenological constructions, should be considered in the learning of chemistry. The central idea of chemical identity is defined ...   Chemistry students' and professors' conceptions of chemical identity: Part I – Chemical identity as the basis of the macroscopic concept of substance   Hannah Sevian,¹* Courtney Ngai,¹ Gabriela Szteinberg

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

QuEChERS Method Development for Bio-monitoring of low molecular weight polycyclic aromatic hydrocarbons in South African carp fish using hplc-fluorescence: an initial assessment

Matrix components in the analysis of polycyclic aromatic hydrocarbons (PAHs) in fish require analytical methods with high selectivity and sensitivity. A quick, easy, cheap, effective, rugged and safe ... assessment     Afolake Olufunmilola OduntanI; Nikita Tawanda TavengwaI; Ewa CukrowskaI; Sabelo Dalton MhlangaII; Luke ChimukaI, * IMolecular Sciences Institute, School of Chemistry, University of