1,721,045 research outputs found
Leaping Forward Without Losing Sight of the Past: A Collective Reflection on the Future of Mobile Learning
No full textThis paper presents the viewpoints of six international scholars who reflect on how they see mobile learning (ML) becoming its future self by reflecting on its past. Each scholar reflects on ML learning into the future with an eye to the evolving nature of ML theory, alternative philosophical perspectives, associated pedagogy and practice, design and research practices and methods in ML, and emerging technologies relevant to ML. Along the way, they explore the potential impact - both positive and negative of adoption and non-adoption of ML in education and life-long learning settings
Evaluation of the lecithin/sphingomyelin ratio and the foam test as tests of fetal lung maturity
No full textThe original publication is available at http://www.samj.org.zaCITATION: Van der Merwe, H. J. & Cranna, E. J. 1978. Evaluering van die lesitien isfingomielien verhouding en die skuimtoets as fetale longmaturiteitstoetse. South African Medical Journal, 53:54-57.The lecithin/sphingomyelin (L/S) ratio and the foam test to determine fetal lung maturity in order to prevent hyaline membrane disease (HMD) were used in 800 patients. The incidence of HMD in all neonates diminished from 3,25% in 1971, when the lung maturity test was not done, to 2,12% in 1975, the 4th year that such determinations were done. In the same period the incidence of respiratory distress syndrome (RDS) increased from 3,68% to 4,31%. Only 1% of fetuses in whom lung maturity was determined during the period 1972-1975 developed HMD. This reduced incidence of HMD is considered to be the result of prenatal determination of fetal lung maturity. No correlation was found between fetal lung maturity and length of gestation or physical condition of the neonate. The foam test results were compared with the L/S ratio, and a false positive figure of 8,3% and a false negative figure of 27,1% were found. It is recommended that the foam test be used for screening and the L/S determination be done only if the foam test is negative in high-risk patients.Publisher’s versio
Poverty and a practical ministry of liberation and development within the context of the traditional Venda concept of man
No full textThesis (M. A. (Biblical Studies)) -- University of the North, 1989Refer to the documen
Amino acid requirements of South African Mutton Merino lambs 3. Duodenal and whole empty body essential amino acid profile
No full textCITATION: Ferreira, A. V., Van Der Merwe, H. J. & Loest, C. A. 1999. Amino acid requirements of South African Mutton Merino lambs 3. Duodenal and whole empty body essential amino acid profile. South African Journal of Animal Sciences, 29(1):40-47.The original publication is available at https://www.sasas.co.za/The duodenal and whole empty body essential amino acid (EAA) profile of South African Mutton Merino lambs fed a standard growth diet was investigated. The data of 20 lambs were used. With the exception of phenylalanine, significant (p < 0.05) differences between the EAA concentrations of the duodenal digesta and whole empty body occurred. From the chemical score, it was concluded that the duodenal digesta was first-limiting in histidine and second-limiting in methionine, followed by threonine and arginine for the whole empty body growth of South African Mutton Merino ram lambs fed a standard diet high in rumen degradable protein. A calculated essential amino acid composition for the correction of imbalances in duodenal digesta was as follows (%): 11.21 arginine; 14.53 histidine; 8.17 isoleucine; 9.97 leucine; 8.64 lysine; 13.87 methionine; 9.97 phenylalanine; 12.54 threonine and 11.11 valine.https://www.sasas.co.za/journals/amino-acid-requirements-of-south-african-muttton-merino-lambs-3-duodenal-and-whole-empty-body-essential-amino-acid-profile/Publisher's versio
Die verhoudingsvraagstuk in polisiëring
No full textHierdie ondersoek het betrekking op die verhoudingsvraagstuk in polisiëring. Die bevindinge is gebaseer op inligting wat deur middel van 'n vraelys ingesamel is. Vir hierdie doel is 718 respondente (Blankes, Kleurlinge en Asiërs) binne die munisipale dorpsgebied van Pietersburg ewekansig geselekteer om te bepaal wat die mening van 'n verteenwoordigende aantal respondente in Pietersburg is. Die opname van die gegewens is gedurende Desember 1979 en Januarie 1980 deur ondersoeker persoonlik en 'n aantal veldwerkers (Asiërs, Blankes en Kleurlinge) gedoen. Die doel met die ondersoek was primêr om die aard van bestaande verhoudinge tussen die Suid-Afrikaanse Polisie en die publiek volgens die mening van 'n ondersoekgroep te bepaal en om moontlike verhoudingversteurende faktore te identifiseer. Die ondersoekresultate weerspieël uiteraard slegs die menings van die inwoners van Pietersburg en veralgemenings is gevaarlik. Bepaalde hipoteses wat met die oog op die ondersoekgebied geformuleer is, is getoets en dit blyk volgens die bevindinge dat bestaande verhoudinge huidig in die polisiëringsproses geskend word. Verskeie faktore wat stremmend kan inwerk op die handhawing van gesonde onderlinge verhoudinge, is geidentifiseer
Die verhoudingsvraagstuk in polisiering
Get PDFHierdie ondersoek het betrekking op die verhoudingsvraagstuk in polisiëring. Die bevindinge is gebaseer op inligting wat deur middel van 'n vraelys ingesamel is. Vir hierdie doel is 718 respondente (Blankes, Kleurlinge en Asiërs) binne die munisipale dorpsgebied van Pietersburg ewekansig geselekteer om te bepaal wat die mening van 'n verteenwoordigende aantal respondente in Pietersburg is. Die opname van die gegewens is gedurende Desember 1979 en Januarie 1980 deur ondersoeker persoonlik en 'n aantal veldwerkers (Asiërs, Blankes en Kleurlinge) gedoen. Die doel met die ondersoek was primêr om die aard van bestaande verhoudinge tussen die Suid-Afrikaanse Polisie en die publiek volgens die mening van 'n ondersoekgroep te bepaal en om moontlike verhoudingversteurende faktore te identifiseer. Die ondersoekresultate weerspieël uiteraard slegs die menings van die inwoners van Pietersburg en veralgemenings is gevaarlik. Bepaalde hipoteses wat met die oog op die ondersoekgebied geformuleer is, is getoets en dit blyk volgens die bevindinge dat bestaande verhoudinge huidig in die polisiëringsproses geskend word. Verskeie faktore wat stremmend kan inwerk op die handhawing van gesonde onderlinge verhoudinge, is geidentifiseer
Physical form of maize grain in finishing rations of ram lambs
No full textEnglish: The effect of whole (WMG), ground (GMG) and fine (FMG) maize grain in finishing
rations for lambs containing 20 and 40% lucerne hay respectively was investigated.
Thirty 3-month-old SA Mutton Merino lambs were randomly allocated to 6 treatments of
5 animals each. A digestibility and production study was carried out (60 lambs in total).
All lambs were kept in individual pens for the duration of the various studies.
The dry matter intake (DMI) of the lambs in the digestibility study consuming the ration
with WMG was significantly (P=0.0052) lower than those fed FMG. Processing of maize
grain resulted a significant (P<0.05) reduction in the apparent digestibility of dry matter,
crude protein, acid detergent fibre and gross energy as well as digestible crude protein
and metabolisable energy (ME).
In contrast with DMI (P>0.05) the apparent digestibility of dry matter, crude protein and
gross energy were significantly (P<0.05) decreased with an increase in roughage level to
40%. Acid detergent fibre digestibility showed no statistical significant (P>0.05)
differences between dietary roughage levels. Lucerne hay level did not influence
(P>0.05) the ME-content of the finishing rations within a specific physical form.
Physical form of maize grain in finishing rations for lambs did not significantly (P>0.05)
influence DMI, feed conversion and carcass characteristics. The inclusion of FMG in a
finishing ration with 40% lucerne hay resulted in a significant (P=0.0013) lower MEintake.
A significantly (P<0.05) poorer weight gain and energy efficiency were observed
for lambs fed WMG in the ration.
The inclusion of 20 and 40% lucerne hay in finishing rations of lambs did not
significantly (P>0.05) influence DMI, ME-intake and weight gain as well as feed and
energy efficiency. A higher (P<0.05) carcass weight and dressing percentage occurred
when 20% compared to 40% lucerne hay was included in the lamb-finishing ration.
It was concluded that the physical form of maize grain in finishing rations has no
influence on the performance of lambs. Accordingly no physical form x roughage
level (20 to 40% lucerne hay) interaction exists in finishing rations for lambs.Afrikaans: Die effek van heel (HMG), gruis (GMG) en fyn (FMG) mieliegraan in die
afrondrantsoene vir lammers, bevattende 20 en 40% lusernhooi onderskeidelik, is
ondersoek. Dertig 3 maande oud SA Vleismerino lammers is ewekansig ingedeel in 6
behandelings met 5 diere elk. 'n Vertering- sowel as 'n produksiestudie is uitgevoer
(60 lammers in totaal). Alle lammers is gehuisves in individuele kratte gedurende die
onderskeie studies.
Die droëmateriaalinname (DMI) van die lammers in die verteringstudie wat die
rantsoen met HMG gevoer is, was betekenisvol (P=0.0052) laer as die van die FMG
rantsoene. Prosessering van mieliegraan het 'n betekenisvolle (P<0.05) verlaging in
skynbare verteerbaarheid van droëmateriaal, ruproteïen, suurbestande vesel en brutoenergie
sowel as verteerbare ruproteïen en metaboliseerbare energie (ME)
teweeggebring.
In teenstelling met DMI (P>0.05), het die skynbare verteerbaarheid van
droëmateriaal, ruproteïen en bruto-energie betekenisvol (P<0.05) verlaag 'n die
verhoging van die ruvoerpeil na 40%. Verteerbaarheid van suurbestande vesel het
geen statistiese betekenisvolle (P>0.05) verskille tussen ruvoerpeile getoon nie.
Lusernhooi het nie die ME-inhoud van afrondrantsoene binne 'n spesifieke fisiese
vorm betekenisvol (P>0.05) beïnvloed nie.
Fisiese vorm van mieliegraan in afrondrantsoene vir lammers het nie DMI,
voeromset, en karkaseienskappe betekenisvol (P>0.05) beïnvloed nie. Die insluiting
van FMG in 'n afrondrantsoen met 40% lusernhooi het 'n betekenisvolle (P<0.05) laer
ME-inname tot gevolg gehad. 'n Betekenisvolle (P<0.05) swakker massatoename en
energie-omset is waargeneem by lammers wat die HMG rantsoene ontvang het.
Die insluiting van 20 en 40% lusernhooi in afrondrantsoene van lammers het nie
DMI, ME-inname en massatoename sowel as voer- en energie-omset betekenisvol
(P>0.05) beïnvloed nie. 'n Hoër (P<0.05) karkasmassa en uitslagpersentasie het
voorgekom wanneer 20% in vergelyking met 40% lusernhooi in afrondingsrantsoene
vir lammers ingesluit is.
Daar is tot die slotsom gekom dat die fisiese vorm van mieliegraan in afrondrantsoene
geen invloed op die prestasie van lammers gehad het nie. Dienooreenkomstig het
geen fisiese vorm x ruvoerpeil (20 na 40% lusernhooi) interaksie voorgekom in
afrondrantsoene vir lammers nie
Voedingstelsels vir die produksie van kalfsvleis vanaf suiwelbulkalwers
No full textAfrikaans: 1. Die doel van hierdie studie was om die effek van vloeistoftipe (melk versus melksurrogaat) voor speen en verskillende kragvoer- tot ruvoerverhoudings vanaf ongeveer drie maande ouderdom op die biologiese en ekonomiese doeltreffendheid van kalfsvleisproduksie met die oog op verhoogde rooivleisproduksie te ondersoek.
2. Twee-en-dertig Friesbulkalwers (geboortemassas gemiddeld 36 kg) is in 'n ewekansige blokontwerp, met vier behandelings en agt herhalings per behandeling, ingedeel.
3. Die kalwers is aan die volgende voedingstelsels onderwerp:
(1) 46 dae volmelk en 'n 80% kragvoerrantsoen vanaf 83 dae ouderdom.
(2) 46 dae melksurrogaat en 'n 60% kragvoerrantsoen vanaf 83 dae ouderdom.
(3) 46 dae melksurrogaat en 'n 70% kragvoerrantsoen vanaf 83 dae ouderdom.
(4) 46 dae melksurrogaat en 'n 80% kragvoerrantsoen vanaf 83 dae ouderdom.
'n Kalfaanvangsmeel is vanaf die eerste dag tot 82 dae ouderdom ad lib. aan alle proefdiere verskaf.
4. Daar is van lusern, gemaal deur 'n 50 mm sif, in die onderskeie rantsoene gebruik gemaak. Berekende ruproteïeninhoud van die aanvangsmeel was 19% en dié van die kragvoermengsels 14% gewees.
5. Proefkalwers is op gemiddeld 152 dae ouderdom geslag (5 maande) en karkasdata is ingesamel.
6. Die vier swaarste proefdiere uit elke groep is op +/- 120 dae ouderdom aan 'n verteringstudie onderwerp. Die skynbare verteerbaarheid van droëmateriaal, organiese materiaal, ruproteïen, suuronoplosbare vesel en bruto energie het nie-betekenisvol (P > 0,05) met 'n toename in kragvoerinhoud van die rantsoen, toegeneem. Die skynbaar verteerbare ruproteïen (%) en energie-inhoud (MJ/kg) van die 60%-, 70%- en 80% kragvoeorrantsoene was onderskeidelik 7,51 en 10,62; 8,33 en 11,40; 8,22
en 12,90. Verteerbare ruproteïeninname van die 80% kragvoerrantsoen was betekenisvol (P < 0,05) hoër as dié van die kragvoerrantsoen. Eweneens was verteerbare energie-inname hoogs betekenisvol (P < 0,01) hoër by die 80% as by die 60 en 70% kragvoerrantsoene.
7. Geen betekenisvolle (P > 0,05) verskille in massatoename, DM-inname of doeltreffendheid van voeromsetting (DVV) het as gevolg van vloeistoftipe voorgekom nie. Massatoename en DVV voor speen, asook in die totale proeftydperk was egter nie-betekenisvol (P > 0,05) beter vir die volmelk as vir die melksurrogaatgroep. Kalwers wat volmelk in vergelyking met melksurrogaat voor speen ontvang het, het ook 'n nie-betekenisvolle (P > 0,05) hoër karkasmassa getoon.
8. Totale massatoename vir die 70 en 80% kragvoerrantsoen was hoogsbetekenisvol (P 0,05) verskille ten opsigte van
DM-inname of DVV het tussen die onderskeie kragvoermengsels voorgekom nie. DVV was egter nie-betekenisvol (P > 0,05) beter by kalwers wat die rantsoen met 80% kragvoer ontvang het. Dit wil voorkom asof kalwers wat hierdie kragvoermengsel ontvang het beter biologiese resultate gelewer het. Daar is 'n nie-betekenisvolle (P > 0,05) swaarder karkasmassa met 'n verhoging van die kragvoerinhoud in die rantsoen gevind.
9. Uit die ekonomiese evaluasie het dit geblyk dat melksurrogaat in vergelyking met volmelkvoeding voor speen tot hoër bruto inkomstes aanleiding gegee het. Die mees ekonomiese resultate is verkry met die
voedingstelsel waar melksurrogaat voor speen (+/- 46 dae), 'n aanvangsmeel (80% kragvoer) tot 82 dae ouderdom en 'n 80% kragvoermengsel vanaf 83 dae tot bemarking (152 dae) verskaf is.
10. Daar is tot die slotsom gekom dat kalfsvleis wel lonend geproduseer kan word. Verdere navorsing is egter nodig ten einde sekere leemtes uit te skakel. Die grootste probleem is waarskynlik die feit dat geen
superkarkasse geproduseer kon word nie. Verdere nayorsing is nodig om die laatrypheid en gevolglik swak vetneerlegging van Frieskalwers op 'n jong ouderdom die hoof te bied.WNNR (SNO)Rumevit
In-house mentoring and school leadership : perceptions of well-performing primary school principals
Get PDFPublished ArticleA growing scholarship links good leadership with in-house mentoring. This article looks at how well-performing school leaders benefitted from the inhouse mentoring they received. The author reports on a qualitative investigation based on in-depth individual interviews with six primary school leaders from Gauteng, KwaZulu-Natal, Limpopo and Northwest Provence who were purposefully selected based on their receiving a national award for excellence in leadership. These awards were made by the Department of Basic Education in the category 'Excellence in primary school leadership'. The findings show that in-house mentoring benefitted participants holistically through behavioural, knowledge and skills acquisition. Behavioural acquisition included being humble and empathetic towards constructive work performance. Knowledge and skills acquisition related to sustaining the standard of teaching of core subjects, relying on committee input in a relational leadership approach and ensuring a dedicated teacher corps and positive parent involvement. The findings contribute to the discourse on inhouse mentoring for improved school leadership practice
Comprehensive survey of the distribution of colour and phenolics of different red grape wine vineyard blocks from the Robertson area in South Africa
Get PDFCITATION: Van der Merwe, H., Nieuwoudt, H. H., De Beer, D. & Du Toit, W. J. 2012. Comprehensive survey of the distribution of colour and phenolics of different red grape wine vineyard blocks from the Robertson area in South Africa. South African Journal of Enology and Viticulture, 33(1):58-71, doi:10.21548/33-1-1307.The original publication is available at http://www.journals.ac.za/index.php/sajevColour and phenolic content of red grapes are two of the most important constituents required to produce
a quality red wine. In the Robertson grape growing area, difficulty is sometimes experienced with colour
development of grapes. This is especially linked to location and most probably greatly influenced by
season. Forty four vineyard blocks of the cultivars Pinotage, Merlot, Cabernet Sauvignon and Shiraz,
were studied over 3 seasons primarily to focus on colour and phenolic content, but secondly on total
soluble solids, titratable acidity and pH of the grapes. High performance liquid chromatography and
spectrophotometric methods were used to determine various colour and phenolic parameters present at
harvest. This data was used to indicate how colour and phenolic constitution of a part of the Robertson
grape growing area was distributed in relation to various factors, such as cultivar and season. GPS points
were used to map data for the blocks visually. Results showed variable colour and phenolic content for
these grapes based on blocks and phenolic compounds investigated. Shiraz displayed a wider distribution
of certain phenolic compounds over the three seasons than the other 3 cultivars. Seasonality had a great
influence on these results, with outlying blocks being identified.http://www.journals.ac.za/index.php/sajev/article/view/1307Publisher's versio
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