Soil-induced oxidation and subsequent polymerization of aromatic amines is an important pathway for reducing the mobility of amines in soils and their hazard potential in the environment. This study assesses the hypothesis that manganese(III/IV) oxides/hydroxides play a significant role in the oxidation of aromatic amines in whole soils. Aromatic amines including alpha-naphthylamine, p-methoxya...

Aliphatic primary amines are industrial chemicals with a wide variety of applications. For the determination of these substances, HPLC has recently been used; it has several advantages over other analytical methods, including high selectivity and sensitivity. On the other hand, an electrochemiluminescence (ECL) method has been developed as a highly sensitive method for HPLC detection.)-3 Howeve...

How to cite this article: Padayachee, P., Boshoff, H., Olivier, W., & Harding, A. (2011). A blended learning Grade 12 intervention using DVD technology to enhance the teaching and learning of mathematics. Pythagoras, 32(1), Art. #24, 8 pages. http://dx.doi.org/10.4102/ pythagoras.v32i1.24 This article describes the experiences and mathematics performance of Grade 12 learners selected to partici...

As Computer-Assisted Language Learning (CALL) has taken an important role in foreign language teaching and learning, not only is concrete data about the usefulness of technologymediated environments for these purposes necessary, but also how the learning process is improved in such environments when learner training for CALL. The objective of this paper is to present an investigation which soug...

Utilization of hemicelluloses from biomass energy is an important approach to explore renewable resources. A convenient, quick, and inexpensive method for the preparation of blended films from quaternized hemicelluloses (QH) and carboxymethyl cellulose (CMC) was introduced into this study. QH and CMC solution were first mixed to form homogeneous suspension, and then were dried under vacuum to f...

Effects of chemical compositions changes of blended-cement pastes (BCPCCC) on some strength gains of blended cement mortars (BCMSG) were monitored in order to gain a better understanding for developments of hydration and strength of blended cements. Blended cements (BC) were prepared by blending of 5% gypsum and 6%, 20%, 21%, and 35% marble powder (MP) or 6%, 20%, 21%, and 35% brick powder (BP)...

The effect of processing (homogenization, lyophilization, acid-extraction) meat products on iron uptake from meat combined with uncooked iron-fortified cereal was evaluated using an in vitro digestion/Caco-2 cell model. Beef was cooked, blended to create smaller meat particles, and combined with electrolytic iron-fortified infant rice cereal. Chicken liver was cooked and blended, lyophilized, o...

The combustion and emission characteristics of ethyl levulinate (EL)– diesel blended fuels were investigated using engine bench tests. Blended fuels properties, including the kinematic viscosity (KV), density, EL proportions, oxygen content, cetane number (CN), and lower heating value (LHV) were considered. The combustion and emission characteristics of brake-specific fuel consumption (BSFC), a...

BACKGROUND Blended behavior change interventions combine therapeutic guidance with online care. This new way of delivering health care is supposed to stimulate patients with chronic somatic disorders in taking an active role in their disease management. However, knowledge about the effectiveness of blended behavior change interventions and how they should be composed is scattered. OBJECTIVE T...