https://commons.ufh.ac.za/vital/access/manager/Index en-us 5 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:56689 Wed 21 Sep 2022 10:14:11 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7169 Wed 12 May 2021 23:26:21 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11021 Wed 12 May 2021 23:21:21 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3520 Wed 12 May 2021 23:17:45 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3344 Wed 12 May 2021 23:14:06 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:818 Wed 12 May 2021 22:21:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:932 Wed 12 May 2021 20:36:41 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4761 Wed 12 May 2021 20:35:41 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5337 Wed 12 May 2021 20:26:41 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5081 Wed 12 May 2021 20:19:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10984 Wed 12 May 2021 20:12:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5694 0.05) between the results of the two methods of analysis, although direct observations appeared to be a superior method for assessing the diet of giraffe. The diet of giraffe in the Eastern Cape Province was similar to that within their native range with a deciduous species from the genus Acacia (Acacia karroo) being the most important component of the diet. However, giraffe in the Eastern Cape Province consumed more evergreen plant species than those within their native range. The relative lack of deciduous species in the Eastern Cape Province provides a likely explanation for such a result. Seasonal variation in the consumption of the most important species in the diet was evident and this was attributed to the deciduous nature of A. karroo and the seasonal growth of new shoots which were more palatable. The vegetation of the areas most commonly utilised by giraffe at each site was sampled using the point-centred-quarter method and the results related to the frequency of each species in the diet to calculate preference indices. Giraffe preference was strongest for A. karroo and this was attributed to the highly favourable chemical composition of the species. The browse utilisation of giraffe at each site was determined using the twig-length method and intake rates for the three most important species in the diet calculated using a pre-existing regression equation. Male giraffe fed at a higher rate than females. This was probably due to males adopting a “time-minimising” strategy to their feeding in order to allow more time for reproductive pursuits. Giraffe browse utilisation was highest where giraffe density was highest. However, several species were more heavily browsed than others even when giraffe density was low, suggesting that giraffe are capable of negatively affecting the indigenous flora of the province. I conclude that giraffe numbers should be reduced relative to property size in the Eastern Cape Province and that research into the impact of not only giraffe but the combined effects of giraffe and other extralimital herbivores on the indigenous flora and fauna be continued.]]> Wed 12 May 2021 20:07:54 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10863 Wed 12 May 2021 20:02:50 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10128 Wed 12 May 2021 19:52:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3032 Wed 12 May 2021 19:51:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1812 Wed 12 May 2021 19:50:37 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11032 0.8, and one with 0.2 < d < 0.8. At the end of the three-month duration of the study, the experimental group indicated better performances at the end of the study than at the start, thereby confirming the positive and lasting effect of the water-based intervention programme. Therefore, the use of a water-based programme in improving motor proficiency is supported. However, implementation of the programme over a longer period is recommended.]]> Wed 12 May 2021 19:40:49 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7172 Wed 12 May 2021 19:34:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:8541 Wed 12 May 2021 19:23:35 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5914 Wed 12 May 2021 19:23:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11095 Wed 12 May 2021 19:15:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11004 Wed 12 May 2021 19:09:14 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1750 Wed 12 May 2021 19:07:15 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10868 Wed 12 May 2021 18:56:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3921 Wed 12 May 2021 18:42:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4132 50%). In the current study, the specific activities of a range of extracellular hydrolytic enzymes (L-alanine aminopeptidase, L-leucine aminopeptidase, arylsulphatase, α-glucosidase, β- glucosidase, protease and lipase) were monitored in a sulfide gradient within a biosulphidogenic RSBR. Data obtained indicated that the specific enzymatic activities increased with the depth of the RSBR and also correlated with a number of the physicochemical parameters including sulfide, alkalinity and sulfate. The activities of α- glucosidase and β-glucosidase were higher than that of the other enzymes studied. Lipase activity was relatively low and studies conducted on the enzyme-enzyme interaction using specific enzyme inhibitors indicated that lipases were probably being digested by the proteases. Further studies to determine the impact of sulfide on the enzymes, showed an increase in the enzyme activity with increasing sulfide concentration. Possible direct affects were investigated by looking for changes in the Michaelis constant (Km) and the maximal velocity (Vmax) of the crude enzymes with varying sulfide concentrations (250, 400 and 500 mg/l) using natural and synthetic substrates. The results showed no significant difference in both the Km and the Vmax for any of the hydrolytic enzymes except for the protease. The latter showed a statistically significant increase in the Km with increasing sulfide concentration. Although this indicated a direct interaction, this difference was not large enough to be of biochemical significance and was consequently not solely responsible for the enhanced hydrolysis observed in the RSBR. Investigation into the floc characteristics indicated that the biosulphidogenic RSBR flocs were generally small in size and became more dendritic with the depth of the RSBR. Based on the above data, the previously proposed descriptive models of enhanced hydrolysis of particulate organic matter in a biosulphidogenic RSBR has been revised. It is thought that the effect of sulfide on the hydrolysis step is primarily indirect and that the reduction in floc size and alteration of the floc shape to a more dendritic form is central to the success of the process.]]> Wed 12 May 2021 18:32:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10869 Wed 12 May 2021 18:27:33 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:809 Wed 12 May 2021 18:26:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35440 Wed 12 May 2021 17:57:51 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11040 Wed 12 May 2021 17:37:18 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11035 Wed 12 May 2021 17:18:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4093 Wed 12 May 2021 17:08:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:9489 Wed 12 May 2021 16:48:15 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7170 Wed 12 May 2021 16:47:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7032 Wed 12 May 2021 16:19:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3431 Wed 12 May 2021 16:05:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10859 Wed 12 May 2021 16:05:41 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11016 Wed 12 May 2021 16:02:51 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10803 Wed 12 May 2021 15:56:33 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1027 Wed 12 May 2021 15:51:15 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:40276 Wed 12 May 2021 14:51:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6568 Wed 08 May 2024 17:43:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3672 Tue 31 Aug 2021 09:50:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:63008 Tue 28 Mar 2023 12:31:56 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:63006 Tue 28 Mar 2023 12:24:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:63004 Tue 28 Mar 2023 12:24:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:63002 Tue 28 Mar 2023 12:18:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:62996 Tue 28 Mar 2023 12:04:17 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:62987 Tue 28 Mar 2023 11:28:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:62973 Tue 28 Mar 2023 10:18:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:56629 cyclohexenol > trans-cyclohexanediol > cyclohexene oxide > cyclohexene hydroperoxide. The mechanism for the formation of these products involves both singlet oxygen and radicals (Type II and Type I mechanisms, respectively). The catalyst degraded slowly when low light intensities were employed. The product yields were found to depend on the light intensity, the nature of solvent, irradiation time and the rate of photodegradation of the catalyst.]]> Tue 20 Sep 2022 12:50:11 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:56628 Tue 20 Sep 2022 12:48:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:40073 Tue 14 May 2024 06:35:51 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6834 Thu 25 Apr 2024 15:47:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7072 Thu 16 May 2024 08:36:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7073 Thu 16 May 2024 07:04:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6680 Thu 13 May 2021 15:38:36 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10997 Thu 13 May 2021 12:13:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5317 Thu 13 May 2021 08:56:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4870 Thu 13 May 2021 08:52:49 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11029 0.05) were observed between the experimental techniques for: block time, force-time measures during block time, sprint times, sprint velocity and acceleratio n measures at intervals up to 50m. Significant differences (p<0.05) were however observed between reaction times for the experimental techniques. Slower reaction times are most likely due to increased upper body pretension, resulting from the increased hip elevation seen for these techniques. The results indicate that increased hip elevation may have delayed the initiation of the relevant motor response required to affect an optimal sprint start. Technique 1 resulted in the shortest reaction times, shortest block times, fastest sprint times and greatest sprint velocities for all four techniques. This result was possibly due to the athlete’s experience with, and repeated use of, this technique. The experimental techniques therefore provided no added advantage over the subject’s preferred starting technique and did not significantly optimise sprint starting performance. The results show that modification of the front knee angle had no significant influence on sprint starting performance and sprint running ve locity or acceleration patterns up to 50m. Using Pearson’s Correlation Coefficient to determine the strongest correlations between isokinetic knee strength and sprint starting performance, analysis revealed that the strongest relationships were found between sprint starting performance expressed as acceleration and isokinetic knee strength expressed as relative peak torque and absolute peak torque. For Technique 1 the strongest correlation was found between acceleration (30m - 40m) and relative peak torque as measured at a test speed of 240°/s (r = 0.62). For the remaining experimental techniques, the strongest correlation was found between acceleration (10m - 20m) and relative peak torque as measured at a test speed of 60°/s (r = 0.53) for Technique 2, between acceleration (40m - 50m) and peak torque measured at a test speed of 60°/s (r = 0.72) for Technique 3, and between acceleration (0m - 5m) and peak torque as measured at a test speed of 240°/s (r = 0.71) for Technique 4. These results suggest that isokinetic muscle strength does not correlate strongly with sprint starting performance and that additional factors, such as neuromuscular organisation and muscle fibre typing, possibly make a greater contribution to optimal sprint starting performance.]]> Thu 13 May 2021 08:47:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6575 Thu 13 May 2021 08:25:42 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10978 Thu 13 May 2021 08:18:25 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5917 Thu 13 May 2021 08:10:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1566 Thu 13 May 2021 08:04:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6183 Thu 13 May 2021 07:32:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5271 Thu 13 May 2021 07:23:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3063 Thu 13 May 2021 06:36:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5796 Thu 13 May 2021 06:35:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11059 Thu 13 May 2021 06:18:02 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:2201 Thu 13 May 2021 06:06:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10864 Thu 13 May 2021 05:40:32 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:826 Thu 13 May 2021 05:32:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1938 Thu 13 May 2021 04:36:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11036 Thu 13 May 2021 04:17:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11085 Thu 13 May 2021 04:09:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4450 Thu 13 May 2021 03:23:18 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11064 Thu 13 May 2021 03:21:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:1695 Thu 13 May 2021 03:09:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4387 Thu 13 May 2021 02:35:39 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:8499 Thu 13 May 2021 02:31:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:10585 Thu 13 May 2021 01:41:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7040 Thu 13 May 2021 01:40:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:5330 Thu 13 May 2021 01:25:24 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6177 Thu 13 May 2021 00:57:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11031 Thu 13 May 2021 00:55:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11088 Thu 13 May 2021 00:28:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:11024 Thu 13 May 2021 00:27:46 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6494 Thu 11 Aug 2022 07:05:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37940 Thu 09 May 2024 07:01:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6098 Sat 24 Jun 2023 13:42:04 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:2196 Mon 15 Nov 2021 11:58:20 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38682 Mon 14 Aug 2023 11:50:13 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6734 Mon 13 May 2024 13:14:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:72904 Mon 03 Jun 2024 09:54:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6847 Mon 03 Apr 2023 12:03:35 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6904 Fri 26 Apr 2024 12:36:02 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:43729 10% of the stem below 2 m) coppiced (resprouted). However, individuals that had been affected by regular fires, or repeatedly harvested, appeared prone to a fungal disease and had high percentage mortality. The populations occurring on private land appeared the most vigorous. Habitat in one protected area had been reduced through the construction of a dam. In another, small W. salutaris populations exhibited a shrubby growth form, probably due to frequent fires. Our current knowledge for this species supports a global IUCN status of EN A4acd. Plant conservation needs to become a higher priority both within and outside protected areas. Commercially harvested populations should be better managed through improved harvesting techniques and monitoring. Cultivation levels urgently need to be increased. Further research should be conducted on factors limiting regeneration, including the most appropriate fire regime.]]> Fri 10 May 2024 15:53:06 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:43730 Fri 10 May 2024 15:52:27 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6650 Fri 10 May 2024 14:09:51 SAST ]]>