Die geborgenheid van die onderwyser as voorwaarde vir opvoedende skoolonderwys

Teacher security as a pre-condition for adding pedagogical value to teaching in schools Since 1994 the new political dispensation in South Africa has led to several disruptions in the education system. Teachers have not escaped the effects of this disruption, and many teachers manifest symptoms of insecure behaviour. Because of their insecurity, many teachers are unable to add pedagogical value to their teaching efforts. The disruption they are currently experiencing is, however, by no means more radical or acute than in other periods in South African history. A number of guidelines are offered by means of which (teachers’ perceptions of) teacher security can be improved. This is done on the premise that strengthening teacher security and safety will not only enable teachers to understand their divine calling as well as the nature of pedagogical involvement with learners, but will indeed motivate them to also apply pedagogical principles and insight in actual classroom practice

Disease patterns in Transkei and Ciskei

In 1972 disease patterns in selected representative areas of Transkei and Ciskei were surveyed. Some of the findings are presented

Performatiwiteit en die hedendaagse skool(hoof)

Performativity and the modern school (principal) Based on observations in the field of education management science, including the results of a recent empirical survey, we concluded that schools and their principals have become inundated with the demands for performativity, i.e. the demand to achieve in measurable terms as well as submit to the cult of efficiency and effectiveness. After briefly considering recent developments and changes in schools and in the work of school principals, we refer to the findings of the empirical survey. This is followed by a discussion of three key objections to performativity in schools and in the work of principals, namely the reductionism that it presupposes, its non-pedagogical tendencies and its negative effects on the school as a societal relationship. The discussion is conducted within a Christian-reformational frame of reference

Onderwys-/opleidingsvoorsiening en ekonomiese aanvraag

Education/training and economic demand Education systems and their output appear to be out of step with the demands of the economy in many countries, including South Africa. Massive education investment and expansion seem to have resulted, especially in developing countries, in schooled unemployment rather than economic development, modernisation and full employment. A historicalcomparative overview reveals how economically successful countries such as the United Kingdom, the United States of America, Germany, and (until recently) the new economic giants of South-East Asia and the Far East, succeeded in aligning education and training with the economy. In conclusion the implications of their strategies for South Africa are explored. A combination of the British and Singaporean models is recommended for South Africa. A warning is, however, sounded throughout that economic systems that do not adhere to the principles of human stewardship and responsible management should not be supported by education and training in their present forms. Those involved in education and training should rather call for reform of the systems that they are expected to support

A study on the function of some subcellular systems of the sheep myocardium during gousiekte. II. The contractile protein system

Two groups of Merino sheep were intoxicated separately and at different times with "gousiektebossie" (Pachystigma pygmaeum) until definite symptoms of heart failure were auscultated. Cardiectomy was carried out and some ventricular muscle from I group was stored in 50% glycerol at -20⁰C for about 4 months. Natural actomyosin (n-actomyosin) was subsequently extracted and tested for magnesium, calcium and adenosine triphosphate (ATP)-dependent adenosine triphosphatase (ATP-ase) activity as well as for superprecipitation characteristics. Muscle strips were taken from the other group and stored for 2 weeks in 50% glycerol at -20⁰C, where after it was analysed for an isometric tension-calcium response. The data showed no difference between gousiekte and control sheep in the sensitivity of the contractile system to the activating effect of calcium ions with respect to isometric tension development. A significant reduction of the magnesium dependent ATP-ase was found for gousiekte n-actomyosin in either the presence or absence of calcium ions. A depressed sensitivity for this enzyme to increasing concentrations of ATP in comparison to controls was also found ([ATP] < 1mM, [MgC1₂] = 1mM). No significant difference could be detected in the sensitivity of the n-actomyosin:ATP-ase system to magnesium. n-Actomyosin:ATP-ase of gousiekte hearts revealed a depressed sensitivity to calcium ions. Gousiekte n-actomyosin also showed a significant depression in the rate of superprecipitation with a concomitant increase in the duration of the clearing phase. We conclude from these observations that a definite biochemical lesion is induced in the contractile proteins of heart muscle obtained from sheep intoxicated with "gousiektebossie" at the stage of cardiac failure. This condition is characterized by abnormal superprecipitation characteristics and a depressed n-actomyosin:ATP-ase activity, showing a reduced sensitivity to the activating effect of calcium ions.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

A study on the function of some subcellular systems of the sheep myocardium during gousiekte. I. The energy production system

In order to determine the status of the energy production system of the heart during cardiac failure of sheep with gousiekte, observations were made of the heart tissue levels of adenosine triphosphate (ATP), creatine phosphate (CrP), inorganic phosphate, reduced nicotine adenine dinucleotide (NADH) and lactate. Some measurements on oxidative phosphorylation were also made. A significant decrease in ATP and CrP levels coincided with a simultaneous rise in the ATP:CrP ratio and lactate levels in gousiekte hearts. No significant deviations in inorganic phosphate and NADH levels could be demonstrated. These abnormalities were accompanied by a decreased uptake of oxygen by isolated mitochondria of gousiekte hearts. There was a marked increase in the anaerobic state of the hearts of dying gousiekte sheep, while the values of NADH and the ATP:CrP ratio at a presymptomatic stage indicated a possible early derangement in the energy metabolism of sheep fed the toxic material. No hypertrophy could be detected for the failing ventricles of gousiekte sheep after being corrected for a significant amount of oedema found in the heart tissue of these animals. It was concluded that the depressed ATP and CrP levels in the heart tissue of gousiekte sheep during cardiac failure could at least in part, be attributed to a depressed aerobic energy production. It is not possible, however, to state whether this is a primary or a secondary response due to intoxication and also whether it could be seen as a cause or effect of cardiac failure.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

Observation of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 with H.E.S.S. and MAGIC in May 2016

The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behavior, and is one of only a few FSRQs detected at very high energy (VHE, E >100 GeV) -rays. VHE -ray observations with H.E.S.S. and MAGIC during late May and early June 2016 resulted in the detection of an unprecedented flare, which reveals for the first time VHE -ray intranight variability in this source. While a common variability timescale of 1.5 hr is found, there is a significant deviation near the end of the flare with a timescale of ∼ 20 min marking the cessation of the event. The peak flux is nearly two orders of magnitude above the low-level emission. For the first time, curvature is detected in the VHE -ray spectrum of PKS 1510-089, which is fully explained through absorption by the extragalactic background light. Optical R-band observations with ATOM reveal a counterpart of the -ray flare, even though the detailed flux evolution differs from the VHE lightcurve. Interestingly, a steep flux decrease is observed at the same time as the cessation of the VHE flare. In the high energy (HE, E >100 MeV) -ray band only a moderate flux increase is observed with Fermi-LAT, while the HE -ray spectrum significantly hardens up to a photon index of 1.6. A search for broad-line region (BLR) absorption features in the -ray spectrum indicates that the emission region is located outside of the BLR. Radio VLBI observations reveal a fast moving knot interacting with a standing jet feature around the time of the flare. As the standing feature is located ∼ 50 pc from the black hole, the emission region of the flare may have been located at a significant distance from the black hole. If this correlation is indeed true, VHE rays have been produced far down the jet where turbulent plasma crosses a standing shock.Accepted manuscrip