Voeding en fisieke welstand as deel van die skoolkurrikulum : 'n intervensie in 'n onderwysopleidingprogram : oorspronklike navorsing : voedsel
Authors: Josef J. De Beer and Ben-Erik Van Wyk
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32, pp 1 –6 (2013) http://dx.doi.org/10.4102/satnt.v32i1.771
Hierdie artikel beskryf onderwysstudente se deelname aan simulasiespele tydens 'n ekskursie. Daar word gekyk na hoe die Verenigde Nasies se agt millennium-ontwikkelingsdoelwitte betrek kan word in die opleidingskurrikulum vir onderwysers. In die besonder word daar gefokus op aktiwiteite wat gerig is om voornemende onderwysers meer sensitief te maak vir die MIV en VIGS-pandemie en voedselsekuriteit. Die navorsers werk vanuit 'n nieu-Vygotskiaanse vertrekpunt wat bekend staan as aktiwiteitsteorie, waarbinne hulle simulasiespele as die primêre werktuig vir studente se deelname beskou. Die studente neem deel in 'n homo ludens-modus (dié van die spelende mens, volgens Huizinga 1955) as 'n vorm van beliggaamde betekenisgewing. Deur van aktiwiteitsteorie as 'n lens gebruik te maak, word daar voorgestel dat die ekskursiekurrikulum belofte inhou vir die leerproses van studente aangaande sake rakende MIV- en VIGS-opvoeding, armoede en voedselsekuriteit.
Nutrition and physical well-being in the school curriculum: An intervention in a teachers' education programme.
This article describes education students' engagement in simulation games during an excursion. The focus is on how the United Nations' eight millennium development goals could be addressed in teacher education programmes. The authors specifically look at activities that aim to sensitize teachers about HIV and AIDS and food security. They view learning from a neo-Vygotskian perspective known as activity theory, which rates simulation games as the primary strategy for learner involvement. The students become homo ludens (playing human, Huizinga 1955), and this facilitates embodied meaning-making. From this position it is suggested that the particular curriculum holds some promise for exploring HIV and AIDS education, poverty and food security.
Vergelyking van die uitwerking van sedentêre en aktiewe werkomgewings op algehele welstand : oorspronklike navorsing : voedsel
Authors: Lee-Anne Naicker, Peet Du Toit, Evangeline Nortje, Michael Kleynhans, Ronel Ferreira and Gerda Gericke
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32, pp 1 –6 (2013) http://dx.doi.org/10.4102/satnt.v32i1.768
Die begrip welstand het oor die afgelope dekades verander na gelang die lewenstyl van die samelewing met tegnologiese vooruitgang tred gehou het. Die hedendaagse siening is dat welstand in die eerste plek die verantwoordelikheid van die individu self is en bepaal word deur die beoefening van gedrag wat gesondheid bevorder. Daar is verskeie faktore wat bydra tot gesondheid in die sin van 'n individu se gevoel van algehele welstand op die lang termyn. Een van die belangrikstes daarvan is fisieke aktiwiteit, en daar is aansienlike navorsing gedoen om die voordele van 'n fisiek aktiewe lewenstyl te ondersoek. Hierdie navorsingsoorsig gaan van die veronderstelling uit dat die mees akkurate metode om dié voordele te peil, is om 'n aktiewe met 'n sedentêre lewenstyl te vergelyk. Die doel van die oorsig is om die begrip 'algehele welstand' te verduidelik en om die voordele van 'n werkomgewing wat fisieke aktiwiteit toelaat en die nadele van 'n omgewing waarin daar hoofsaaklik gesit word uit te lig wanneer dit op die bereiking van algehele welstand aankom.
The influence of sedentary and active work environments on wellness.
The concept of wellness has changed over the decades with the ever-changing lifestyle of society as it adapts to technological advances. The contemporary view is that wellness is the primary responsibility of the individual and is accomplished by practising health-promoting behaviour. There are various factors that contribute to wellness in the sense of an individual's long-term sense of overall well-being. One of the most essential factors is physical activity, and there is a large body of research that explores the benefits of a physically active lifestyle. This article is based on the assumption that the most accurate way to measure these benefits are to compare an active with a sedentary lifestyle. The purpose of this review is to clarify the concept of wellness and highlight the benefits of a physically active working environment as opposed to the disadvantages of a sedentary environment in attaining overall wellbeing.
Menings van lewenswetenskap-onderwysers oor geneties gewysigde gewasse en die daarstelling van 'n wetenskaplike etiek : oorspronklike navorsing : voedsel
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32, pp 1 –5 (2013) http://dx.doi.org/10.4102/satnt.v32i1.757
Die gebruik van geneties gewysigde gewasse om hongersnood in veral arm lande die hoof te bied is uiters kontroversieel en kan maatskaplike, ekonomiese en politieke implikasies hê. Lewenswetenskap-onderwysers kan aan die kwessie aandag gee, en deur hul onderrig gebalanseerde inligting aan leerders en aan die gemeenskap deurgee. Nogtans moet onderrig nie bloot op kennisoordrag fokus nie; pogings moet ook aangewend word om veral leerders bewus te maak van die aard en impak van geneties gewysigde gewasse en die ontwikkeling van 'n wetenskaplike etiek. Die klem verskuif daarna om leerders uit alle bevolkingsgroepe te betrek en hulle te bemagtig om deur kritiese en reflektiewe denke weldeurdagte besluite te neem. Leerders moet derhalwe die geleentheid gebied word om 'n wetenskaplike etiek te ontwikkel wat hulle in staat stel om kontroversiële kwessies, soos die gebruik van geneties gewysigde gewasse, te kan beredeneer. Bepaalde aanwysers wat tydens onderhoude met lewenswetenskap-onderwysers geïdentifiseer is, word in die artikel bespreek.
Opinions of Life Sciences teachers on genetically modified foods.
The use of genetically modified crops, especially in countries where poverty is rife, is extremely controversial and can have social, economical and political implications. Life Sciences teachers can address this issue and provide learners and communities with balanced information. However, teaching should not only focus on supplying balanced information, but efforts should also be made to make learners, especially, aware of the nature and impact of genetically modified crops and the development of scientific ethics. The focus then shifts to empowering learners from a broad social background to make well-reasoned decisions through critical and reflective thought. Learners should, therefore, get the opportunity to develop scientific ethics in order to debate various controversial issues such as the use of genetically modified crops. Specific indicators that were identified during interviews with Life Sciences teachers are discussed in this article.
Produksie van nanokalsiumfosfaat ondersteuning met unieke oppervlak- en chemiese eienskappe vir die bevordering van sel-aktiwiteit in been : referaatopsomming
Authors: I. Wepener and A. Joubert
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.852
Nano-calciumphosphate generation with novel surface and chemical features for improvement of cell activity in bone repair and replacement.
Ideal biomaterial for bone replacement implanted should be resorbed by osteoclasts, while osteoblastic activity deposits new bone. Electrospun biphasic nanobioceramic scaffolds were synthesized for in vitro testing, contributing to bone tissue engineering.
In vitro sel seintransduksie van 2-metoksiëstradiol-bis-sulfamaat in 'n borsepiteel adenokarsinoom sellyn en 'n nie-kankeragtige borsepiteel sellyn : referaatopsomming
Authors: M.H. Visagie and A.M. Joubert
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.851
In vitro cell signaling events of 2-methoxyestradiol-bis-sulphamate in a breast adenocarcinoma- and a non-tumorigenic breast epithelial cell line.
2-Methoxyestradiol-bis-sulphamate shows therapeutic potential, however, the exact mechanism of action remains elusive. Data obtained from this study contributes to the embedded scientific knowledge regarding the signalling mechanism exerted by 2-methoxyestradiol-bis-sulphamate.
Die eerste Arachnida opname in die Noord-Wes Provinsie : die Kgaswane Bergreservaat : referaatopsomming
Authors: A. Van den Berg, A.S. Dippenaar-Schoeman and S. Mathebula
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.850
The first arachnid survey from the North-West Province: The Kgaswane Mountain Reserve.
Spiders have been collected monthly over a period of four years from the Kgaswane Mountain Reserve. The aim of this study was to compile the first species list of the spiders of the reserve and it contributes to our knowledge of the spider's diversity of the North-West Province.
Indusering van die fenielpropanoïd-weg in koringplante na begassing met SO2 in open-top groeikamers (OTCs) : referaatopsomming
Authors: L. Snyders and J.M. Berner
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.849
Induction of the phenylpropanoid pathway in wheat plants after fumigation with SO2 in open-top chambers (OTCs).
Wheat plants were planted in open-top chambers and fumigated with 0 ppb, 50 ppb, 150 ppb en 300 ppb SO2. Increases in SO2 resulted in the increase of phenylalanine ammonia-lyase (PAL) activity and total phenolic acid content.
Histologie as 'n biomerker om die effek van besoedeling op twee visspesies in die Hartbeespoortdam te bestudeer : voorlopige resultate : referaatopsomming
Authors: N.N. Sikhakhane, J.C. Van Dyk and G.M. Pieterse
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.848
Histology as a biomarker to determine the effect of pollution on two fish species from the Hartebeespoort Dam: Prelimanary results.
The aim of the study was to determine the type and severity of histological alterations in selected target organs of Clarias gariepinus and Cyprinus carpio. The results of this study indicate that there are macroscopic and histological alterations in the target organs of both the selected species from the Hartebeespoort Dam.
Termietvretende spinnekoppe van die Cederberg Wilderness Area (Araneidae: Ammoxenidae) : referaatopsomming
Authors: S.L. Seshothela, A.S. Dippenaar-Schoeman and T. Bird
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.847
Termite eating spiders of the Cedarberg Wilderness Area (Araneae: Ammoxenidae).
Spiders were sampled with 680 pit traps in the Cedarberg Wilderness Area during 2004. The Ammoxenidae was the most dominant family represented by five species of which three are new to science.
Strukturele skade veroorsaak deur SO2 gas op die blare van koring (Triticum aestivum) : referaatopsomming
Authors: K.J. Radojevic, E.P.J. Kleynhans and A. Jordaan
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.846
Structural damage caused by SO2, on leaves of wheat (Triticum aestivum).
The effect of SO2 on wheat is not fully known. Wheat was exposed to different concentrations of SO2. There was clear structural damage in epidermal cells. It was clear that SO2 has a significant impact on cell structure.
Ex situ monitoring van Frithia humilis Burgoyne : 'n kontrolo studio vir 'n translokasie projek : referaatopsomming
Authors: T. Orlekowsky, J. Viviers, E. Kruger and S.J. Siebert
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.845
Ex situ monitoring of Frithia humilis Burgoyne: A control study for a translocation project.
Frithia humilis was listed on the South Africa Red Data List as endangered in 2009. This is due to pressures exerted on its limited habitat by mining activities and climate change. Only nine localities still exist and are associated with felsite and underlying coal deposits. When the locality of a sub-population of 4000 plants became threatened by coal mining activities, the plants were translocated to suitable habitats. Approximately 1000 plants were distributed to botanical gardens for ex situ conservation purposes, which included the garden of the North-West University. The purpose of the monitoring project was to determine and compare the survival rate of ex situ material with that of in situ populations. Thus far it has been established that ex situ populations are more stable, although the in situ population numbers show better fecundity.
Die genus Helicotylenchus in die grasveld bioom van Suid-Afrika : referaatopsomming
Authors: A.S. Schoeman and L.R. Tiedt
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.843
The genus Helicotylenchus in the grassland biome of South Africa.
The genus Helicotylenchus is widespread in South Africa with 25 of the 33 Helicotylenchus species in the grassland biome. With 23 species reported from uncultivated areas, 14 species from crop plants and 10 species from the grasses grown on sports fields, Helicotylenchus is ideally suited for a study on the impact of cultivation on nematode diversity.
Die effek van sport visie oefeninge op die visuele vaardighede van studente : referaatopsomming
Authors: A.F. Mahomed, M. Kleynhans, C. Govender and P.J. Du Toit
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.842
The effect of sports vision exercises on the visual skills of university students.
Stress is an important factor which most students must deal with and is known to adversely affect the ability to perform visual skills effectively. The results showed an improvement in all tests in both the control and experimental groups. The experimental group showed a greater improvement in tracking, sequencing, visualisation and the reflex test. The study clearly showed that correct sports vision training can improve certain visual skills and lead to an enhancement of motor learning and performance. Sports vision exercises are therefore an efficient method of improving visual skills and possibly minimising any deficits caused by stress.
'n Evaluasie van embrio eienskappe om die mees geskikte embrio te selekteer vir oorplasing deur die gebruik van 'n puntestelsel : referaatopsomming
Authors: P. Maharaj and C. Huyser
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.841
An evaluation of embryo characteristic score to select the most favorable embryo for transfer.
The need for establishing a greater knowledge of embryo quality variables is needed. Thus constructing reliable scoring systems is becoming increasingly more evident. This may result in selection of the appropriate embryo and reducing the number of embryos transferred.
Die bestudering van lang termyn lae-nagtemperatuur op koue-sensitiewe sojaboon (Glycine max) genotipe en die herstel proses : referaatopsomming
Authors: E. Kriel, M. De Beer, M.M. Minaar and C.C.W. Scheepers
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.840
Effects of cold stress and the recovery thereafter on soybean (Glycine max) plants.
The study of long-term low night temperatures on cold sensitive soybean plants and the recovery process was monitored using Chlorophyll a fluorescent and photosynthetic gas exchange measurements.
Identifisering van 'n sianoprokarioot deur middel van polifasiese benadering : referaatopsomming
Authors: E. Heystek, N.J.J. Niemand and S. Bamard
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.839
Identification of a cyanoprocaryote using a poliphasic approach.
Identification of a bloom forming cyanoprocaryote with the aid of morphological characteristics and l6SrDNA gene sequenced fragments. The DNA sequences of the organism, which was identified as Oscillatoria limosa previously, showed high similarity with that of Phormidium autumnale.
Vergelyking van Kardio Stres Indeks tussen universiteit studente en 'n fisies meer aktiewe populasie : referaatopsomming
Authors: E. Henning, M. Kleynhans and P.J. Du Toit
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.838
Results obtained from the study indicate that the Cardio Stress Index (CSI) readings of both male and female university students were significantly higher (p < 0.05) than that of the training population. University students were found to have a 50.31% population risk, whilst 31.50% of the recruit population indicated risk.
Afname in die fotosintese vermoë van koringplante na begassing met SO2 in open-top groeikamers : referaatopsomming
Authors: J. Du Plessis, L. Henning and J.M. Berner
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.836
Decline in the photosynthetic capability of wheat plants after fumigation with SO2 in open-top chambers.
Treating the wheat with 150 ppb and higher of SO2 lead to the reduction in the photosynthetic capability of the wheat. The inability of the electron transport system to transfer electrons was most seriously affected.
Calvatia Fr. (Fungi, Lycoperdaceae) in suider-Afrika : 50 jaar na Bottomley : referaatopsomming
Authors: J.C. Coetzee and A.E. Van Wyk
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32, pp 1 –2 (2013) http://dx.doi.org/10.4102/satnt.v32i1.835
Calvatia Fr. (Fungi, Lycoperdaceae) in southern Africa: 50 Years after Bottomley.
A taxonomic revision of the Calvatia complex in southern Africa, following a comparative morphological approach, has led to the adoption of a broad generic concept comprising thirteen species. Conservation of Calvatia against the older names Omalycus and Lanopila has been proposed.
Die identifikasie en verifikasie van optimale hervestigingsgebiede vir die bromvoël in die Limpopo-provinsie, Suid-Afrika : referaatopsomming
Authors: H.C. Coetzee, D. Cilliers, F. Jerling and L. Van Rensburg
Source: Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 32 (2013) http://dx.doi.org/10.4102/satnt.v32i1.834
The identification and verification of optimal re-introduction sites for the southern ground hornbill in the Limpopo Province, South Africa.
The aim of this study is to identify optimal re-introduction sites for the southern ground-hornbill Bucorvus leadbeateri by compiling a habitat profile based on the results of an Environmental Niche Factor Analysis, mapping similar areas with the help of GIS and verifying the identified areas in terms of biophysical en social indicators.