101 results on '"Nel, W."'
Search Results
2. Spatial assessment of drought severity in Cape Town area, South Africa
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Orimoloye, I.R., Ololade, O.O., Mazinyo, S.P., Kalumba, A.M., Ekundayo, O.Y., Busayo, E.T., Akinsanola, A.A., and Nel, W.
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- 2019
- Full Text
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3. EVALUATING OPPORTUNITIES FOR FURTHER DEVELOPING THE MEDICAL TECHNOLOGY INDUSTRY IN SOUTH AFRICA: A PRODUCT SPACE ANALYSIS.
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Nel, W. and Bam, W.
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MEDICAL technology , *NEW product development - Abstract
Despite recent gains, South Africa is yet to fully develop its economic potential in the medical technologies industry. Yet it remains uncertain which parts of the extended medical technologies industry South Africa should prioritise. This paper uses the input-output product space (IO-PS) methodology to identify key areas in the medical technologies industry that are likely to unlock the industry’s potential in South Africa. The analysis involved using a hierarchical mapping of the industry as input to the IO-PS analysis. Thereafter, the outputs of the methodology were analysed and interpreted. The most promising products for further development under various scenarios were identified. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Rock mass loss on a nunatak in Western Dronning Maud Land, Antarctica
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Hedding, D.W., Hansen, C. D., Nel, W., Loubser, M., Le Roux, J. J., and Meiklejohn, K. I.
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- 2016
5. Maturation of the adolescent brain
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Arain M, Haque M, Johal L, Mathur P, Nel W, Rais A, Sandhu R, and Sharma S
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Mariam Arain, Maliha Haque, Lina Johal, Puja Mathur, Wynand Nel, Afsha Rais, Ranbir Sandhu, Sushil Sharma Saint James School of Medicine, Kralendijk, Bonaire, The Netherlands Abstract: Adolescence is the developmental epoch during which children become adults – intellectually, physically, hormonally, and socially. Adolescence is a tumultuous time, full of changes and transformations. The pubertal transition to adulthood involves both gonadal and behavioral maturation. Magnetic resonance imaging studies have discovered that myelinogenesis, required for proper insulation and efficient neurocybernetics, continues from childhood and the brain's region-specific neurocircuitry remains structurally and functionally vulnerable to impulsive sex, food, and sleep habits. The maturation of the adolescent brain is also influenced by heredity, environment, and sex hormones (estrogen, progesterone, and testosterone), which play a crucial role in myelination. Furthermore, glutamatergic neurotransmission predominates, whereas gamma-aminobutyric acid neurotransmission remains under construction, and this might be responsible for immature and impulsive behavior and neurobehavioral excitement during adolescent life. The adolescent population is highly vulnerable to driving under the influence of alcohol and social maladjustments due to an immature limbic system and prefrontal cortex. Synaptic plasticity and the release of neurotransmitters may also be influenced by environmental neurotoxins and drugs of abuse including cigarettes, caffeine, and alcohol during adolescence. Adolescents may become involved with offensive crimes, irresponsible behavior, unprotected sex, juvenile courts, or even prison. According to a report by the Centers for Disease Control and Prevention, the major cause of death among the teenage population is due to injury and violence related to sex and substance abuse. Prenatal neglect, cigarette smoking, and alcohol consumption may also significantly impact maturation of the adolescent brain. Pharmacological interventions to regulate adolescent behavior have been attempted with limited success. Since several factors, including age, sex, disease, nutritional status, and substance abuse have a significant impact on the maturation of the adolescent brain, we have highlighted the influence of these clinically significant and socially important aspects in this report. Keywords: myelinogenesis, neurocircuitry, molecular imaging, drug addiction, behavior, social adjustment
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- 2013
6. Clinical significance of metallothioneins in cell therapy and nanomedicine
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Sharma S, Rais A, Sandhu R, Nel W, and Ebadi M
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Medicine (General) ,R5-920 - Abstract
Sushil Sharma,1 Afsha Rais,1 Ranbir Sandhu,1 Wynand Nel,1 Manuchair Ebadi21Saint James School of Medicine, Bonaire, The Netherlands; 2Department of Pharmacology, Physiology, and Therapeutics, Center of Excellence in Neuroscience, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND, USAAbstract: Mammalian metallothioneins (MTs) are low molecular weight (6–7 kDa) cysteine-rich proteins that are specifically induced by metal nanoparticles (NPs). MT induction in cell therapy may provide better protection by serving as antioxidant, anti-inflammatory, antiapoptotic agents, and by augmenting zinc-mediated transcriptional regulation of genes involved in cell proliferation and differentiation. Liposome-encapsulated MT-1 promoter has been used extensively to induce growth hormone or other genes in culture and gene-manipulated animals. MTs are induced as a defensive mechanism in chronic inflammatory conditions including neurodegenerative diseases, cardiovascular diseases, cancer, and infections, hence can serve as early and sensitive biomarkers of environmental safety and effectiveness of newly developed NPs for clinical applications. Microarray analysis has indicated that MTs are significantly induced in drug resistant cancers and during radiation treatment. Nutritional stress and environmental toxins (eg, kainic acid and domoic acid) induce MTs and aggregation of multilamellar electron-dense membrane stacks (Charnoly body) due to mitochondrial degeneration. MTs enhance mitochondrial bioenergetics of reduced nicotinamide adenine dinucleotide–ubiquinone oxidoreductase (complex-1), a rate-limiting enzyme complex involved in the oxidative phosphorylation. Monoamine oxidase-B inhibitors (eg, selegiline) inhibit α-synuclein nitration, implicated in Lewy body formation, and inhibit 1-methyl 4-phenylpyridinium and 3-morpholinosydnonimine-induced apoptosis in cultured human dopaminergic neurons and mesencephalic fetal stem cells. MTs as free radical scavengers inhibit Charnoly body formation and neurodegenerative α-synucleinopathies, hence Charnoly body formation and α-synuclein index may be used as early and sensitive biomarkers to assess NP effectiveness and toxicity to discover better drug delivery and surgical interventions. Furthermore, pharmacological interventions augmenting MTs may facilitate the theranostic potential of NP-labeled cells and other therapeutic agents. These unique characteristics of MTs might be helpful in the synthesis, characterization, and functionalization of emerging NPs for theranostic applications. This report highlights the clinical significance of MTs and their versatility as early, sensitive biomarkers in cell-based therapy and nanomedicine.Keywords: metallothioneins, free radicals, Charnoly body, α-synuclein index, nanomedicine, toxicity, stem cells, theranostics
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- 2013
7. Fusarium chuoi Crous, Osieck, Jurjevi, Boers, Iperen, Starink-Willemse, Dima, Balashov, Bulgakov, Johnston, Morozova, Pinruan, Sommai, Alvarado, Decock, Lebel, McMullan-Fisher, Moreno, Shivas, Zhao, Abdollahzadeh, Abrinbana, Ageev, Akhmetova, Alexandrova, Altés, Amaral, Angelini, Antonín, Arenas, Asselman, Badali, Baghela, Bañares, Barreto, Baseia, Bellanger, Berraf-Tebbal, Biketova, Bukharova, Burgess, Cabero, Câmara, Cano-Lira, Ceryngier, Chávez, Cowan, Lima, Oliveira, Denman, Dang, Dovana, Duarte, Eichmeier, Erhard, Esteve-Raventós, Fellin, Ferisin, Ferreira, Ferrer, Finy, Gaya, Geering, Gil-Durán, Glässnerová, Glushakova, Gramaje, Guard, Guarnizo, Haelewaters, Halling, Hill, Hirooka, Hubka, Iliushin, Ivanova, Ivanushkina, Jangsantear, Justo, Kachalkin, Kato, Khamsuntorn, Kirtsideli, Knapp, Kochkina, Koukol, Kovács, Kruse, Kumar, Kušan, Læssøe, Larsson, Lebeuf, Levicán, Loizides, Marinho, Luangsa-ard, Lukina, Magaña-Dueñas, Maggs-Kölling, Malysheva, Malysheva, Martín, Martín, Matočec, McTaggart, Mehrabi-Koushki, Mešić, Miller, Mironova, Moreau, Morte, Müller, Nagy, Nanu, Navarro-Ródenas, Nel, Nguyen, Nóbrega, Noordeloos, Olariaga, Overton, Ozerskaya, Palani, Pancorbo, Papp, Pawłowska, Pham, Phosri, Popov, Portugal, Pošta, Reschke, Reul, Ricci, Rodríguez, Romanowski, Ruchikachorn, Saar, Safi, Sakolrak, Salzmann, Sandoval-Denis, Sangwichein, Sanhueza, Sato, Sastoque, Senn-Irlet, Shibata, Siepe, Somrithipol, Spetik, Sridhar, Stchigel, Stuskova, Suwannasai, Tan, Thangavel, Tiago, Tiwari, Tkalčec, Tomashevskaya, Tonegawa, Tran, Tran, Trovão, Trubitsyn, Wyk, Vieira, Vila, Visagie, Vizzini, Volobuev, Vu, Wangsawat, Yaguchi, Ercole, Ferreira, Souza, Vieira & Groenewald, 2021, sp. nov
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Crous, P. W., Osieck, E. R., Jurjevi, ��, Boers, J., Van Iperen, A. L., Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Pinruan, U., Sommai, S., Alvarado, P., Decock, C. A., Lebel, T., McMullan-Fisher, S., Moreno, G., Shivas, R. G., Zhao, L., Abdollahzadeh, J., Abrinbana, M., Ageev, D. V., Akhmetova, G., Alexandrova, A. V., Alt��s, A., Amaral, A. G. G., Angelini, C., Anton��n, V., Arenas, F., Asselman, P., Badali, F., Baghela, A., Ba��ares, A., Barreto, R. W., Baseia, I. G., Bellanger, J. - M., Berraf-Tebbal, A., Biketova, A. Yu., Bukharova, N. V., Burgess, T. I., Cabero, J., C��mara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Ch��vez, R., Cowan, D. A., de Lima, A. F., Oliveira, R. L., Denman, S., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, A., Erhard, A., Esteve-Ravent��s, F., Fellin, A., Ferisin, G., Ferreira, R. J., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Gil-Dur��n, C., Gl��ssnerov��, K., Glushakova, A. M., Gramaje, D., Guard, F. E., Guarnizo, A. L., Haelewaters, D., Halling, R. E., Hill, R., Hirooka, Y., Hubka, V., Iliushin, V. A., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., Kachalkin, A. V., Kato, S., Khamsuntorn, P., Kirtsideli, I. Y., Knapp, D. G., Kochkina, G. A., Koukol, O., Kov��cs, G. M., Kruse, J., Kumar, T. K. A., Ku��an, I., L��ss��e, T., Larsson, E., Lebeuf, R., Levic��n, G., Loizides, M., Marinho, P., Luangsa-ard, J. J., Lukina, E. G., Maga��a-Due��as, V., Maggs-K��lling, G., Malysheva, E. F., Malysheva, V. F., Mart��n, B., Mart��n, M. P., Mato��ec, N., McTaggart, A. R., Mehrabi-Koushki, M., Me��i��, A., Miller, A. N., Mironova, P., Moreau, P. - A., Morte, A., M��ller, K., Nagy, L. G., Nanu, S., Navarro-R��denas, A., Nel, W. J., Nguyen, T. H., N��brega, T. F., Noordeloos, M. E., Olariaga, I., Overton, B. E., Ozerskaya, S. M., Palani, P., Pancorbo, F., Papp, V., Paw��owska, J., Pham, T. Q., Phosri, C., Popov, E. S., Portugal, A., Po��ta, A., Reschke, K., Reul, M., Ricci, G. M., Rodr��guez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Shibata, A., Siepe, K., Somrithipol, S., Spetik, M., Sridhar, P., Stchigel, A. M., Stuskova, K., Suwannasai, N., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., Tkal��ec, Z., Tomashevskaya, M. A., Tonegawa, C., Tran, H. X., Tran, N. T., Trov��o, J., Trubitsyn, V. E., Van Wyk, J., Vieira, W. A. S., Vila, J., Visagie, C. M., Vizzini, A., Volobuev, S. V., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., de Souza, A. P., Vieira, B. S., and Groenewald, J. Z.
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Ascomycota ,Fusarium ,Sordariomycetes ,Hypocreales ,Fungi ,Nectriaceae ,Biodiversity ,Fusarium chuoi ,Taxonomy - Abstract
Fusarium chuoi R. Hill, Gaya, D.T. Vu, Sand.-Den. & Crous, sp. nov. Etymology. From chu���i, Vietnamese vernacular name for Musa spp., from which the ex-type strain was isolated. Classification ��� Nectriaceae, Hypocreales, Sordariomycetes. On SNA and CLA, sporulation abundant from aerial conidiophores and sporodochia. Aerial conidiophores erect or prostrate, copiously branching laterally and sympodially, giving rise to macro-, and rarely, microconidia; aerial conidiogenous cells mono- and polyphialidic, subulate to subcylindrical, smooth- and thin-walled, proliferating sympodially, 6.5���40.5 �� 2.5���4 ��m, with apical flared collarette and periclinal thickening; aerial conidia of two types: microconidia often produced on prostrate conidiophores, rarely on aerial mycelium, aggregating in false heads, ellipsoidal, subcylindrical to slightly falcate, 0 ���1-septate, 8���15 �� 2���29.5 ��m; macroconidia fusiform to falcate, straight to apically dorsiventrally curved, apex curved to pointed, base obtuse to papillate, 1���3-septate, smooth- and thin-walled; 1-septate conidia: (14���)18���27.5(���29.5) �� (2.5���)3���4 ��m (av. 22.8 �� 3.2 ��m); 2-septate conidia: 26���28.5 �� 3���4 ��m (av. 27.4 �� 3.6 ��m); 3-septate conidia: (28���)31.5���43(���50.5) �� 3���4 ��m (av. 37.3 �� 3.5 ��m). Sporodochia saffron, luteous to ochreous coloured (Rayner 1970), formed abundantly on the agar surface and carnation leaves under nuv. Conidiophores in sporodochia, densely and irregularly branched, bearing apical whorls of 2 ��� 4 monophialides; sporodochial monophialides subcylindrical, 10���26 �� 2.5���4.5 ��m, smooth- and thin-walled, with a distinct apical collarette. Sporodochial conidia (macroconidia) falcate, almost straight to gently curved, tapering at both ends, apex curved to blunt, base poorly- to well-developed foot-shaped, 1���6-septate, hyaline, smooth- and thin-walled; 1-septate conidia: (14.5���)15���20.5(���24) �� 3���4.5 ��m (av. 17.9 �� 3.9 ��m); 2-septate conidia: 21.5���32 �� 3���4.5 ��m (av. 26.4 �� 3.5 ��m); 3-septate conidia: (33���)43���61(���71.5) �� (3���)4���5 ��m (av. 51.8 �� 4.2 ��m); 4-septate conidia: (50.5���)55���69(���74.5) �� 3.5���5 ��m (av. 62.3 �� 4.2 ��m); 5-septate conidia: 54 �� 4.5 ��m (rare); 6-septate conidia: (49.5���)56.5���71(���73) �� (3.5���)4���4.5(���5) ��m (av. 63.8 �� 4.3 ��m). Chlamydospores not observed. Culture characteristics ��� Colonies on potato dextrose agar (PDA) and oatmeal agar (OA) growing in the dark at 24 �� C covering and entire 9 cm Petri dish in 7 d. Colony surface peach to vinaceous, flat, velvety to felty with abundant floccose aerial mycelium forming concentric rings; colony margins undulate. Reverse flesh to salmon with diffuse coral to brick pigment throughout the medium. Typus. VIETNAM, H�� Tĩnh Province, H����ng S��n District,S��n Kim commune, N18��25'37.38" E105��12'53.95", inside seed of Musa itinerans (Musaceae), 9 Nov. 2014, D.M. Thu, L.T. Phong & T.T. Duong, isol. R. Hill (holotype CBS H-24901,culture ex-type CBS 148464; ITS, LSU, cmdA, rpb1, rpb2, tef1 and tub2 sequences GenBank OK586454, OK586452, OK626304, OK626306, OK626302, OK626308 and OK626310, MycoBank MB 841865). Colour illustrations. Flowers, fruits, leaves and seeds of Musa itinerans (background photo by D. T. Vu); from top to bottom and left to right: colony on PDA after 14 d at 24 �� C in darkness (left = obverse,right = reverse), sporodochia formed on CLA,aerial conidiophore,aerial conidiogenous cells,aerial conidia, sporodochial conidia. Scale bars: black = 20 ��m, white = 10 ��m. Additional material examined. VIETNAM, Ngh��� An Province, Con Cu��ng District, Ch��u Kh�� commune, N19��1'48.73" E104��43'31.97", inside seed of M. itinerans, 18 Nov. 2014, L.T. Phong, V.V. Tung & T.T. Duong, isol. R. Hill (culture CBS 148465; ITS, LSU, cmdA, rpb1, rpb2, tef1 and tub2 sequences GenBank OK586455, OK586453, OK626305, OK626307, OK626303, OK626309 and OK626311). Notes ��� Fusarium chuoi resides in the Asian clade of the Fusarium fujikuroi species complex (FFSC: O���Donnell et al. 1998, Yilmaz et al. 2021, Crous et al. 2021b). Based on nucleotide searches using the Fusarium Pairwise ID engine on the Fusarioid-ID database (www.fusarium.org, Crous et al. 2021) the closest hit using the ITS sequence was Fusarium siculi (strain CBS 142422; identities = 449/450 (99 %), no gaps). The closest hit using the LSU sequence was F. siculi (strain CBS 142422; identities = 804/805 (99 %), no gaps). Closest hit using the cmdA sequence was Fusarium fractiflexum (strain NRRL 28852; identities = 426/434 (98 %), no gaps). Closest hit using the rpb1 sequence was F. fujikuroi (strain NRRL 13566; identities = 687/702 (98 %), no gaps). Closest hit using the rpb2 sequence was Fusarium globosum (strain CBS 428.97; identities = 856/867 (98 %), no gaps). Closest hit using the tef1 sequence was F. fractiflexum (strain NRRL 28852; identities = 619/643 (96 %), 2 gaps (0.3 %)). The phylogenetic results, however, showed that F. chuoi is not directly related to any of the previously described species of FFSC (see Suppl. material FP1353), clustering as the second basal-most species of that clade after F. sacchari. Asian Fusarium spp. in the FFSC are characterised by mono-and polyphialides producing oval to ellipsoid, rarely pyriform to globose (i.e., F. annulatum, F. fujikuroi and F. globosum) microconidia organized in chains or false heads; 3���5-septate sporodochial conidia and lacking chlamydospores. The elaborate, profusely branched aerial conidiophores of F. chuoi are comparable to those of F. concentricum, F. lumajangense, F. mangiferae and F. sacchari, all the latter species producing oval, ellipsoidal to allantoid microconidia on false heads.Aerial conidiophores of F. chuoi, however, mostly produce macroconidia, while microconidia grouped on false heads are restricted to short, mostly unbranched and prostrate conidiophores formed on the surface on the culture media. Several Asian species of the FFSC have been reported from Musa spp. i.e., F. annulatum, F. concentricum, F. fujikuroi, F. lumajangense and F. sacchari (Leslie & Summerell 2006, Maryani et al. 2019, Farr & Rossman 2021). The two strains representing F. chuoi were isolated as endophytes from asymptomatic seeds of wild banana (Musa itinerans), which had been collected predispersal and stored in the Millennium Seed Bank for ~2.5 years at -20 �� C prior to isolation. Supplementary material FP1353 Phylogenetic tree., Published as part of Crous, P. W., Osieck, E. R., Jurjevi, ��, Boers, J., Van Iperen, A. L., Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Pinruan, U., Sommai, S., Alvarado, P., Decock, C. A., Lebel, T., McMullan-Fisher, S., Moreno, G., Shivas, R. G., Zhao, L., Abdollahzadeh, J., Abrinbana, M., Ageev, D. V., Akhmetova, G., Alexandrova, A. V., Alt��s, A., Amaral, A. G. G., Angelini, C., Anton��n, V., Arenas, F., Asselman, P., Badali, F., Baghela, A., Ba��ares, A., Barreto, R. W., Baseia, I. G., Bellanger, J. - M., Berraf-Tebbal, A., Biketova, A. Yu., Bukharova, N. V., Burgess, T. I., Cabero, J., C��mara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Ch��vez, R., Cowan, D. A., de Lima, A. F., Oliveira, R. L., Denman, S., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, A., Erhard, A., Esteve-Ravent��s, F., Fellin, A., Ferisin, G., Ferreira, R. J., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Gil-Dur��n, C., Gl��ssnerov��, K., Glushakova, A. M., Gramaje, D., Guard, F. E., Guarnizo, A. L., Haelewaters, D., Halling, R. E., Hill, R., Hirooka, Y., Hubka, V., Iliushin, V. A., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., Kachalkin, A. V., Kato, S., Khamsuntorn, P., Kirtsideli, I. Y., Knapp, D. G., Kochkina, G. A., Koukol, O., Kov��cs, G. M., Kruse, J., Kumar, T. K. A., Ku��an, I., L��ss��e, T., Larsson, E., Lebeuf, R., Levic��n, G., Loizides, M., Marinho, P., Luangsa-ard, J. J., Lukina, E. G., Maga��a-Due��as, V., Maggs-K��lling, G., Malysheva, E. F., Malysheva, V. F., Mart��n, B., Mart��n, M. P., Mato��ec, N., McTaggart, A. R., Mehrabi-Koushki, M., Me��i��, A., Miller, A. N., Mironova, P., Moreau, P. - A., Morte, A., M��ller, K., Nagy, L. G., Nanu, S., Navarro-R��denas, A., Nel, W. J., Nguyen, T. H., N��brega, T. F., Noordeloos, M. E., Olariaga, I., Overton, B. E., Ozerskaya, S. M., Palani, P., Pancorbo, F., Papp, V., Paw��owska, J., Pham, T. Q., Phosri, C., Popov, E. S., Portugal, A., Po��ta, A., Reschke, K., Reul, M., Ricci, G. M., Rodr��guez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Shibata, A., Siepe, K., Somrithipol, S., Spetik, M., Sridhar, P., Stchigel, A. M., Stuskova, K., Suwannasai, N., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., Tkal��ec, Z., Tomashevskaya, M. A., Tonegawa, C., Tran, H. X., Tran, N. T., Trov��o, J., Trubitsyn, V. E., Van Wyk, J., Vieira, W. A. S., Vila, J., Visagie, C. M., Vizzini, A., Volobuev, S. V., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., de Souza, A. P., Vieira, B. S. & Groenewald, J. Z., 2021, Fusarium chuoi R. Hill, Gaya, D. T. Vu, Sand. - Den. & Crous, R. Hill, Gaya, D. T. Vu, Sand. - Den. & Crous sp. nov., pp. 310-311 in Fungal Planet 47 (1) on page 311, DOI: 10.5281/zenodo.5856199, {"references":["Rayner RW. 1970. A Mycological Colour Chart. Commonwealth Mycological Institute, Kew and British Mycological Society.","O'Donnell K, Cigelnik E, Nirenberg H. 1998. Molecular systematics and phylogeography of the Gibberella fujikuroi species complex. Mycologia 90: 465 - 493.","Yilmaz N, Sandoval-Denis M, Lombard L, et al. 2021. Redefining species limits in the Fusarium fujikuroi species complex. Persoonia 46: 129 - 162.","Crous PW, Lombard L, Sandoval-Denis M, et al. 2021 b. Fusarium: more than a node or a foot-shaped basal cell. Studies in Mycology 98: 100116.","Crous PW, Cowan DA, Maggs-Kolling G, et al. 2021 a. Fungal Planet descrip- tion sheets: 1182 - 1283. Persoonia 46: 313 - 528.","Leslie JF, Summerell BA. 2006. The Fusarium laboratory manual. Blackwell Publishing, Ames.","Maryani N, Sandoval-Denis M, Lombard L, et al. 2019. New endemic Fusarium species hitch-hiking with pathogenic Fusarium strains causing Panama disease in small-holder banana plots in Indonesia. Persoonia 43: 48 - 69."]}
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- 2021
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8. ‘n Ondersteunende stelsel vir die toets van konsensus-algoritmes
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Bothma, JDP, primary, Nel, W, additional, and Fouché, RC, additional
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- 2022
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9. Fungal Planet description sheets:1284-1382
- Author
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Crous, P. W., Osieck, E. R., Jurjevi, Z., Boers, J., Van Iperen, A. L., Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Pinruan, U., Sommai, S., Alvarado, P., Decock, C. A., Lebel, T., McMullan-Fisher, S., Moreno, G., Shivas, R. G., Zhao, L., Abdollahzadeh, J., Abrinbana, M., Ageev, D., Akhmetova, G., Alexandrova, A. V., Altes, A., Amaral, A. G. G., Angelini, C., Antonin, V., Arenas, F., Asselman, P., Badali, F., Baghela, A., Bañares, Á., Barreto, R. W., Baseia, I. G., Bellanger, J.-M., Berraf-Tebbal, A., Biketova, A. Yu., Bukharova, N. V., Burgess, T. I., Cabero, J., Camara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Chávez, R., Cowan, D. A., de Lima, A. F., Oliveira, R. L., Denman, S., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, A., Erhard, A., Esteve-Raventos, F., Fellin, A., Ferisin, G., Ferreira, R. J., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Gil-Duran, C., Glässnerová, K., Glushakova, A. M., Gramaje, D., Guard, F. E., Guarnizo, A. L., Haelewaters, D., Halling, R. E., Hill, R., Hirooka, Y., Hubka, V., Iliushin, V. A., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., Kachalkin, A. V., Kato, S., Khamsuntorn, P., Kirtsideli, I. Y., Knapp, D. G., Kochkina, G. A., Koukol, O., Kovacs, G. M., Kruse, J., Kumar, T. K. A., Kusan, I., Læssøe, T., Larsson, E., Lebeuf, R., Levican, G., Loizides, M., Marinho, P., Luangsa-ard, J. J., Lukina, E. G., Magana-Duenas, V., Maggs-Kölling, G., Malysheva, E. F., Malysheva, V. F., Martin, B., Martin, M. P., Matocec, N., McTaggart, A. R., Mehrabi-Koushki, M., Mesic, A., Miller, A. N., Mironova, P., Moreau, P.-A., Morte, A., Müller, K., Nagy, L. G., Nanu, S., Navarro-Rodenas, A., Nel, W. J., Nguyen, T. H., Nobrega, T. F., Noordeloos, M. E., Olariaga, I., Overton, B. E., Ozerskaya, S. M., Palani, P., Pancorbo, F., Papp, V., Pawlowska, J., Pham, T. Q., Phosri, C., Popov, E. S., Portugal, A., Posta, A., Reschke, K., Reul, M., Ricci, G. M., Rodriguez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Shibata, A., Siepe, K., Somrithipol, S., Spetik, M., Sridhar, P., Stchigel, A. M., Stuskova, K., Suwannasai, N., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., Tkalcec, Z., Tomashevskaya, M. A., Tonegawa, C., Tran, H. X., Tran, N. T., Trovao, J., Trubitsyn, V. E., Van Wyk, J., Vieira, W. A. S., Vila, J., Visagie, C. M., Vizzini, A., Volobuev, S. V., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., de Souza, A. P., Vieira, B. S., Groenewald, J. Z., Crous, P. W., Osieck, E. R., Jurjevi, Z., Boers, J., Van Iperen, A. L., Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Pinruan, U., Sommai, S., Alvarado, P., Decock, C. A., Lebel, T., McMullan-Fisher, S., Moreno, G., Shivas, R. G., Zhao, L., Abdollahzadeh, J., Abrinbana, M., Ageev, D., Akhmetova, G., Alexandrova, A. V., Altes, A., Amaral, A. G. G., Angelini, C., Antonin, V., Arenas, F., Asselman, P., Badali, F., Baghela, A., Bañares, Á., Barreto, R. W., Baseia, I. G., Bellanger, J.-M., Berraf-Tebbal, A., Biketova, A. Yu., Bukharova, N. V., Burgess, T. I., Cabero, J., Camara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Chávez, R., Cowan, D. A., de Lima, A. F., Oliveira, R. L., Denman, S., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, A., Erhard, A., Esteve-Raventos, F., Fellin, A., Ferisin, G., Ferreira, R. J., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Gil-Duran, C., Glässnerová, K., Glushakova, A. M., Gramaje, D., Guard, F. E., Guarnizo, A. L., Haelewaters, D., Halling, R. E., Hill, R., Hirooka, Y., Hubka, V., Iliushin, V. A., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., Kachalkin, A. V., Kato, S., Khamsuntorn, P., Kirtsideli, I. Y., Knapp, D. G., Kochkina, G. A., Koukol, O., Kovacs, G. M., Kruse, J., Kumar, T. K. A., Kusan, I., Læssøe, T., Larsson, E., Lebeuf, R., Levican, G., Loizides, M., Marinho, P., Luangsa-ard, J. J., Lukina, E. G., Magana-Duenas, V., Maggs-Kölling, G., Malysheva, E. F., Malysheva, V. F., Martin, B., Martin, M. P., Matocec, N., McTaggart, A. R., Mehrabi-Koushki, M., Mesic, A., Miller, A. N., Mironova, P., Moreau, P.-A., Morte, A., Müller, K., Nagy, L. G., Nanu, S., Navarro-Rodenas, A., Nel, W. J., Nguyen, T. H., Nobrega, T. F., Noordeloos, M. E., Olariaga, I., Overton, B. E., Ozerskaya, S. M., Palani, P., Pancorbo, F., Papp, V., Pawlowska, J., Pham, T. Q., Phosri, C., Popov, E. S., Portugal, A., Posta, A., Reschke, K., Reul, M., Ricci, G. M., Rodriguez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Shibata, A., Siepe, K., Somrithipol, S., Spetik, M., Sridhar, P., Stchigel, A. M., Stuskova, K., Suwannasai, N., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., Tkalcec, Z., Tomashevskaya, M. A., Tonegawa, C., Tran, H. X., Tran, N. T., Trovao, J., Trubitsyn, V. E., Van Wyk, J., Vieira, W. A. S., Vila, J., Visagie, C. M., Vizzini, A., Volobuev, S. V., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., de Souza, A. P., Vieira, B. S., and Groenewald, J. Z.
- Abstract
Novel species of fungi described in this study include those from various countries as follows: Antartica , Cladosporium austrolitorale from coastal sea sand. Australia , Austroboletus yourkae on soil, Crepidotus innuopur- pureus on dead wood, Curvularia stenotaphri from roots and leaves of Stenotaphrum secundatum and Thecaphora stajsicii from capsules of Oxalis radicosa. Belgium , Paraxerochrysium coryli (incl. Paraxerochrysium gen. nov.) from Corylus avellana. Brazil , Calvatia nordestina on soil, Didymella tabebuiicola from leaf spots on Tabebuia aurea, Fusarium subflagellisporum from hypertrophied floral and vegetative branches of Mangifera indica and Microdochium maculosum from living leaves of Digitaria insularis. Canada , Cuphophyllus bondii from a grassland. Croatia , Mollisia inferiseptata from a rotten Laurus nobilis trunk. Cyprus , Amanita exilis on calcareous soil. Czech Republic , Cytospora hippophaicola from wood of symptomatic Vaccinium corymbosum. Denmark , Lasiosphaeria deviata on pieces of wood and herbaceous debris. Dominican Republic , Calocybella goethei among grass on a lawn. France (Corsica) , Inocybe corsica on wet ground. France (French Guiana) , Trechispora patawaensis on decayed branch of unknown angiosperm tree and Trechispora subregularis on decayed log of unknown angiosperm tree. Germany , Paramicrothecium sambuci (incl. Paramicrothecium gen. nov.) on dead stems of Sambucus nigra. India , Aureobasidium microtermitis from the gut of a Microtermes sp. termite, Laccaria diospyricola on soil and Phylloporia tamilnadensis on branches of Catunaregam spinosa. Iran , Pythium serotinoosporum from soil under Prunus dulcis. Italy , Pluteus brunneovenosus on twigs of broadleaved trees on the ground. Japan , Heterophoma rehmanniae on leaves of Rehmannia glutinosa f. hueichingensis. Kazakhstan , Murispora kazachstanica from healthy roots of Triticum aestivum. Namibia , Caespitomonium euphorbiae (incl. Caespitomonium gen. nov.) from stems of an Eup
- Published
- 2021
10. Fungal Planet description sheets: 1284-1382
- Author
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Ministry of Business, Innovation, and Employment (New Zealand), Ministry of Health of the Czech Republic, Japan Society for the Promotion of Science, Charles University (Czech Republic), European Commission, Fundação para a Ciência e a Tecnologia (Portugal), Ministério da Ciência, Tecnologia e Ensino Superior (Portugal), Research Foundation - Flanders, Russian Science Foundation, Lomonosov Moscow State University, Kerala State Council for Science, Technology and Environment, Universidad de Alcalá, Ministry of Innovation and Technology (Hungary), National Research, Development and Innovation Office (Hungary), Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología, Conocimiento e Innovación (Chile), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Estonian Research Council, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Swedish Taxonomy Initiative, Australian Biological Resources Study, Croatian Science Foundation, Fundación Séneca, National Science Foundation (US), New York Botanical Garden, National Science Centre (Poland), Russian Academy of Sciences, Crous, P. W., Osieck, E. R., Jurjević, Željko, Boers, J., Iperen, A. L. van, Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Barreto, R. W., Baseia, I. G., Miller, A. N., Bellanger, J.-M., Berraf-Tebbal, Akila, Biketova, A. Yu., Malysheva, V. F, Bukharova, N. V., Burgess, T. I., Cabero, J., Navarro-Ródenas, A., Câmara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Mironova, P., Chávez, R., Cowan, D. A., Lima, A. F. de, Oliveira, R. L., Martín, B., Denman, S., Nel, W. J., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, Ales, Pinruan, U., Erhard, A., Esteve-Raventós, F., Fellin, A., Ferisin, G., Ferreira, Renato Juciano, Zhao, L., Martín, María P., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Moreau, Pierre-Arthur, Gil-Durán, C., Glässnerová, K., Glushakova, A. M., Gramaje, David, Nguyen, T. H., Guard, F. E., Guarnizo, A.L., Matočec, N., Haelewaters, D., Halling, R. E., Hill, R., Morte, A., Hirooka, Y., Hubka, V., Iliushin, V. A., Nóbrega, T. F., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., McTaggart, Alistair R., Kachalkin, A.V., Kato, S., Müller, K., Khamsuntorn, P., Kirtsideli, I. Y., Noordeloos, M. E., Knapp, D. G., Kochkina, G. A., Koukol, O., Kovács, G. M., Kruse, J., Kumar, T. K. A., Mehrabi-Koushki, M., Kušan, I., Nagy, L. G., Læssøe, T., Sommai, S., Larsson, E., Lebeuf, R., Levicán, G., Loizides, M., Marinho, P., Luangsa-Ard, J. J., Lukina, E. G., Magaña-Dueñas, V., Mešić, A., Nanu, S., Olariaga, I., Maggs-Kölling, G., Overton, B. E., Ozerskaya, S. M., Angelini, C., Palani, P., Pancorbo, F., Papp, V., Abdollahzadeh, J., Pawłowska, J., Pham, T. Q., Phosri, C., Popov, E. S., Alvarado, P., Portugal, A., Antonín, V., Pošta, A., Reschke, K., Reul, M., Ricci, G. M., Abrinbana, M., Rodríguez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Malysheva, E. F., Decock, Cony A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Ageev, D. V., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Arenas, F., Shibata, A., Siepe, K., Lebel, T., Somrithipol, S., Spetik, M., Sridhar, P., Akhmetova, G., Stchigel, A. M., Stuskova, Katerina, Suwannasai, N., Asselman, P., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., McMullan-Fisher, S., Tkalčec, Z., Tomashevskaya, M. A., Alexandrova, A. V., Tonegawa, C., Tran, H. X., Badali, F., Tran, N. T., Trovão, J., Trubitsyn, V. E., Wyk, J. van, Vieira, Willie A. S., Vila, J., Moreno, G., Visagie, C. M., Altés, A., Vizzini, Alfredo, Baghela, A., Volobuev, S. W., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., Souza, A. P. de, Vieira, B. S., Shivas, R. G., Amaral, A. G. G., Bañares, Ángel, Groenewald, J. Z., Ministry of Business, Innovation, and Employment (New Zealand), Ministry of Health of the Czech Republic, Japan Society for the Promotion of Science, Charles University (Czech Republic), European Commission, Fundação para a Ciência e a Tecnologia (Portugal), Ministério da Ciência, Tecnologia e Ensino Superior (Portugal), Research Foundation - Flanders, Russian Science Foundation, Lomonosov Moscow State University, Kerala State Council for Science, Technology and Environment, Universidad de Alcalá, Ministry of Innovation and Technology (Hungary), National Research, Development and Innovation Office (Hungary), Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología, Conocimiento e Innovación (Chile), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Estonian Research Council, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Swedish Taxonomy Initiative, Australian Biological Resources Study, Croatian Science Foundation, Fundación Séneca, National Science Foundation (US), New York Botanical Garden, National Science Centre (Poland), Russian Academy of Sciences, Crous, P. W., Osieck, E. R., Jurjević, Željko, Boers, J., Iperen, A. L. van, Starink-Willemse, M., Dima, B., Balashov, S., Bulgakov, T. S., Johnston, P. R., Morozova, O. V., Barreto, R. W., Baseia, I. G., Miller, A. N., Bellanger, J.-M., Berraf-Tebbal, Akila, Biketova, A. Yu., Malysheva, V. F, Bukharova, N. V., Burgess, T. I., Cabero, J., Navarro-Ródenas, A., Câmara, M. P. S., Cano-Lira, J. F., Ceryngier, P., Mironova, P., Chávez, R., Cowan, D. A., Lima, A. F. de, Oliveira, R. L., Martín, B., Denman, S., Nel, W. J., Dang, Q. N., Dovana, F., Duarte, I. G., Eichmeier, Ales, Pinruan, U., Erhard, A., Esteve-Raventós, F., Fellin, A., Ferisin, G., Ferreira, Renato Juciano, Zhao, L., Martín, María P., Ferrer, A., Finy, P., Gaya, E., Geering, A. D. W., Moreau, Pierre-Arthur, Gil-Durán, C., Glässnerová, K., Glushakova, A. M., Gramaje, David, Nguyen, T. H., Guard, F. E., Guarnizo, A.L., Matočec, N., Haelewaters, D., Halling, R. E., Hill, R., Morte, A., Hirooka, Y., Hubka, V., Iliushin, V. A., Nóbrega, T. F., Ivanova, D. D., Ivanushkina, N. E., Jangsantear, P., Justo, A., McTaggart, Alistair R., Kachalkin, A.V., Kato, S., Müller, K., Khamsuntorn, P., Kirtsideli, I. Y., Noordeloos, M. E., Knapp, D. G., Kochkina, G. A., Koukol, O., Kovács, G. M., Kruse, J., Kumar, T. K. A., Mehrabi-Koushki, M., Kušan, I., Nagy, L. G., Læssøe, T., Sommai, S., Larsson, E., Lebeuf, R., Levicán, G., Loizides, M., Marinho, P., Luangsa-Ard, J. J., Lukina, E. G., Magaña-Dueñas, V., Mešić, A., Nanu, S., Olariaga, I., Maggs-Kölling, G., Overton, B. E., Ozerskaya, S. M., Angelini, C., Palani, P., Pancorbo, F., Papp, V., Abdollahzadeh, J., Pawłowska, J., Pham, T. Q., Phosri, C., Popov, E. S., Alvarado, P., Portugal, A., Antonín, V., Pošta, A., Reschke, K., Reul, M., Ricci, G. M., Abrinbana, M., Rodríguez, A., Romanowski, J., Ruchikachorn, N., Saar, I., Safi, A., Malysheva, E. F., Decock, Cony A., Sakolrak, B., Salzmann, F., Sandoval-Denis, M., Sangwichein, E., Ageev, D. V., Sanhueza, L., Sato, T., Sastoque, A., Senn-Irlet, B., Arenas, F., Shibata, A., Siepe, K., Lebel, T., Somrithipol, S., Spetik, M., Sridhar, P., Akhmetova, G., Stchigel, A. M., Stuskova, Katerina, Suwannasai, N., Asselman, P., Tan, Y. P., Thangavel, R., Tiago, I., Tiwari, S., McMullan-Fisher, S., Tkalčec, Z., Tomashevskaya, M. A., Alexandrova, A. V., Tonegawa, C., Tran, H. X., Badali, F., Tran, N. T., Trovão, J., Trubitsyn, V. E., Wyk, J. van, Vieira, Willie A. S., Vila, J., Moreno, G., Visagie, C. M., Altés, A., Vizzini, Alfredo, Baghela, A., Volobuev, S. W., Vu, D. T., Wangsawat, N., Yaguchi, T., Ercole, E., Ferreira, B. W., Souza, A. P. de, Vieira, B. S., Shivas, R. G., Amaral, A. G. G., Bañares, Ángel, and Groenewald, J. Z.
- Abstract
Novel species of fungi described in this study include those from various countries as follows: Antartica, Cladosporium austrolitorale from coastal sea sand. Australia, Austroboletus yourkae on soil, Crepidotus innuopurpureus on dead wood, Curvularia stenotaphri from roots and leaves of Stenotaphrum secundatum and Thecaphora stajsicii from capsules of Oxalis radicosa. Belgium, Paraxerochrysium coryli (incl. Paraxerochrysium gen. nov.) from Corylus avellana. Brazil, Calvatia nordestina on soil, Didymella tabebuiicola from leaf spots on Tabebuia aurea, Fusarium subflagellisporum from hypertrophied floral and vegetative branches of Mangifera indica and Microdochium maculosum from living leaves of Digitaria insularis. Canada, Cuphophyllus bondii fromagrassland. Croatia, Mollisia inferiseptata from a rotten Laurus nobilis trunk. Cyprus, Amanita exilis oncalcareoussoil. Czech Republic, Cytospora hippophaicola from wood of symptomatic Vaccinium corymbosum. Denmark, Lasiosphaeria deviata on pieces of wood and herbaceousdebris. Dominican Republic, Calocybella goethei among grass on a lawn. France (Corsica) , Inocybe corsica onwetground. France (French Guiana) , Trechispora patawaensis on decayed branch of unknown angiosperm tree and Trechispora subregularis on decayed log of unknown angiosperm tree. [...]
- Published
- 2021
11. Trouelose oorsprongverifikasie van elektroniese intellektuele eiendom deur middel van blokskakeltegnologie (“blockchain technology”)
- Author
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Bezuidenhout, R, primary, Nel, W, additional, and Burger, AJ, additional
- Published
- 2020
- Full Text
- View/download PDF
12. Ellisras Longitudinal Study 2017: association of hypertension with increasing levels of adiposity in 10- to 14-year-old boys and girls in the Eastern Cape (ELS 31)
- Author
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Benedicta N. Nkeh-Chungag, Charlotte Mungho Tata, Nel W, Constance R Sewani-Rusike, and Anye Chungag
- Subjects
Male ,Longitudinal study ,Pediatric Obesity ,Adolescent ,Blood Pressure ,Prehypertension ,South Africa ,Sex Factors ,Risk Factors ,Cape ,medicine ,Prevalence ,Humans ,Child ,Adiposity ,business.industry ,Cardiovascular Topics ,Age Factors ,General Medicine ,Anthropometry ,medicine.disease ,Obesity ,Health Surveys ,Blood pressure ,Cross-Sectional Studies ,Hypertension ,Female ,Cardiology and Cardiovascular Medicine ,business ,Demography - Abstract
OBJECTIVES: Previous studies suggest a strong relationship between obesity and hypertension. This study aimed at evaluating the prevalence of hypertension and pre-hypertension in 10- to 14-year-old boys and girls in the Eastern Cape Province of South Africa and to determine the association between blood pressure parameters and selected measures of adiposity. METHODS: A cross-sectional, school-based study of 540 10- to14-year-old children from seven schools in the Eastern Cape Province was carried out. Anthropometry and blood pressure parameters were determined. RESULTS: All measures of adiposity and blood pressure were significantly higher in the girls (p < 0.05). The prevalence of hypertension and pre-hypertension was over 20 and 12%, respectively. Systolic blood pressure and pulse pressure were associated (r > 0.27; p < 0.05) with increasing levels of adiposity. CONCLUSION: This study highlights the importance of weightcontrol strategies for the prevention of hypertension in these adolescents and later on in life.
- Published
- 2019
13. Theories of change steering transformation at the UFS: a conceptual analysis
- Author
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Makae, Pule Isaac, Nel, W., Keet, A., Makae, Pule Isaac, Nel, W., and Keet, A.
- Abstract
The historically white universities, particularly the Afrikaans-speaking in South Africa were seen to be determined not to transform. However, at the dawn of democracy, there seem to be eagerness to change. This was prompted by the National Education Policy Investigation (NEPI, 1992) and the National Commission of Higher Education (NCHE, 1996) that resulted in the increased participation of black students who were previously excluded from the historically white campuses. Due to the increase of black students a great number of challenges emerged, e.g. the revision of the curricula, teaching approaches and the universities’ autonomy. As a historically white university, the UFS had to follow the new democratic government instruction of transformation which was accelerated at beginning of the 20’s. In order to trace the transformation initiatives at the UFS, a number of relevant documents was consulted, e.g. 1) Education policy documents on higher education, i.e. The Constitution of the RSA, NEPI-1992, NCHE-1997, Education White Paper 3-1997, National Plan For Higher Education-2001, Guidelines for Mergers and Incorporations-2003, the UFS Ministerial Reports on Transformation and Social Cohesion and the Elimination of Discrimination in Public Higher Education Institutions (2008), The Oversight Committee on university transformation-2013 and Higher Education South Africa (HESA) presentations to the Portfolio Committee on Higher Education-2014. 2) Research articles advocating change in South African Education sector, 3) Academic and research articles advocating transformation at the UFS and 4) the Annual Reports of the UFS to the Minister of Higher Education & Training. Meta-Analysis was performed on both the results of the survey that aimed at determining the perceptions and experiences of students and staff regarding race and ethnic issues at the UFS in 2010 (Louw, Jooste and Makae, 2011) and the results from the Perception Audit commissioned by the UFS in February 2014
- Published
- 2019
14. Patients’ preference for general or regional anaesthesia for caesarean deliveries at a district hospital, Free State, South Africa
- Author
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Hanekom, J, primary, Hattingh, R, additional, Nel, W, additional, Thirion, K, additional, Willemse, C, additional, Joubert, G, additional, Boltman, C, additional, and Botes, J, additional
- Published
- 2019
- Full Text
- View/download PDF
15. Ellisras Longitudinal Study 2017: association of hypertension with increasing levels of adiposity in 10- to 14-year-old boys and girls in the Eastern Cape (ELS 31)
- Author
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Chungag, A, primary, Tata, CM, additional, Sewani-Rusike, CR, additional, Nel, W, additional, and Nkeh-Chungag, BN, additional
- Published
- 2019
- Full Text
- View/download PDF
16. Black root rot: a long known but little understood disease
- Author
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Nel, W. J., primary, Duong, T. A., additional, Beer, Z. W., additional, and Wingfield, M. J., additional
- Published
- 2019
- Full Text
- View/download PDF
17. Observations on daily rainfall events in the KwaZulu-Natal Drakensberg
- Author
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Nel, W, primary
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- 2019
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- View/download PDF
18. 'n Evaluasie van gedragsterapie by die behandeling van funksioneel disfonie by kinders
- Author
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Nel, W. G., primary
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- 2018
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19. A new genus and species for the globally important, multihost root pathogen Thielaviopsis basicola
- Author
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Nel, W. J., primary, Duong, T. A., additional, Wingfield, B. D., additional, Wingfield, M. J., additional, and de Beer, Z. W., additional
- Published
- 2017
- Full Text
- View/download PDF
20. Intersectoral collaboration for consolidating support for learners displaying inappropriate behaviour
- Author
-
Mathe, Stenene Michael, Tshelane, M. D., Nel, W. N., Mathe, Stenene Michael, Tshelane, M. D., and Nel, W. N.
- Abstract
The aim of this study was to formulate a framework for consolidating support for learners who display inappropriate behaviour, in order to enhance learner attainment. Participants in this study acted as co-researchers according to the PALAR methodology. This study used a seven-chapter approach to investigating the possibility of providing learners with consolidated support, which required a joint effort by the relevant stakeholders to a) validate the need for formulating the envisaged framework; b) identify the main components necessary for the implementation of the framework; c) anticipate possible threats that may impede the successful implementation of the framework; d) explore the conditions conducive to the sustainability of the framework; and e) to monitor the application of the framework. Seemingly, the abolishment of corporal punishment and the promulgation of legislation that safeguards the well-being of children have led to an escalation of inappropriate behaviour by learners. So, through Ubuntu, as the foundation on which the framework was based, integrated support, which was driven by participatory action learning and action research, was proposed, to ensure that we all take responsibility and accept the challenge of building a humane and caring society by responding to the research question. I used literature to develop constructs that act as organising principles that guide the study to achieve its objectives. Data generated were analysed through the use of critical discourse analysis as advocated by Van Dijk. It was because of the tenets of Ubuntu that the study proposed strong collaboration, based on sound relationships, between stakeholders. Learners displaying inappropriate behaviour were provided with constructive behavioural support programmes, which were within the confines of pieces of legislation, to positively reinforce the exhibition of appropriate behaviour. Therefore, a framework that emphasises collaborative, multi-sectoral support to fac
- Published
- 2017
21. The contribution of the institute for reconciliation and social justice to transformation at the University of the Free State
- Author
-
Vanneste, Lien, Nel, W. N., Vanneste, Lien, and Nel, W. N.
- Abstract
This dissertation reviews the contribution of the Institute for Reconciliation and Social Justice to transformation at the University of the Free State. A qualitative research approach was followed and entailed official document analysis and in-depth interviews. Sixteen key informants were selected and interviewed. The data was thematically analysed so that patterns could be identified. The key findings of this study were: The IRSJ is a strategic unit in the process of pursuing institutional transformation within the UFS. Facilitating the transformation process at UFS equals a higher cognitive legitimate institution because its organisational activities become more in line with the recommendations of the higher education sector as well as the wider social system. Transformation represents a novel idea that needs to be introduced within UFS’ institutional walls. This is not an easy task, but the IRSJ is doing a progressive and productive job by using strategic reframing strategies such as the critical conversations. The IRSJ completes a challenging task of strategically reframing the novel idea of transformation in order to gather more support for this greater goal. They do this by helping people better understand the importance of transformation. This topic is so sensitive and challenging to comprehend that a safe space such as the IRSJ is vital in achieving a transformed institution. Once the UFS will have achieved its transformation goals, it will become a more cognitive legitimate institution that is more accepted by the wider social system.
- Published
- 2017
22. Retreating rights: Human rights, pre-theoretical praxes and student activism in South African universities
- Author
-
Keet, A., primary, Nel, W., additional, and Sattarzadeh, S., additional
- Published
- 2017
- Full Text
- View/download PDF
23. A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
- Author
-
RAISED Consortium, Bentley, J, Cofaigh, O, Anderson, B, Conway, H., Davies, B, Graham, C, Hillenbrand, D, Hodgson, A, Jamieson, R, Larter, D, Mackintosh, A, Smith, A, Verleyen, E., Ackert, P, Bart, J, Berg, S, Brunstein, D, Canals, M, Colhoun, A, Crosta, X, Dickens, A, Domack, E, Dowdeswell, A, Dunbar, R, Ehrmann, W, Evans, J, Favier, V, Fink, D, Fogwill, J, Glasser, F, Gohl, K, Golledge, R, Goodwin, I, Gore, B, Greenwood, L, Hall, L, Hall, K, Hedding, W, Hein, S, Hocking, P, Jakobsson, M, Johnson, S, Jomelli, V, Jones, S, Klages, P, Kristoffersen, Y, Kuhn, G, Leventer, A, Licht, K, Lilly, K, Lindow, J, Livingstone, J, Masse, G, McGlone, S, McKay, M, Melles, M, Miura, H, Mulvaney, R., Nel, W, Nitsche, O, O'Brien, E, Post, L, Roberts, J, Saunders, M, Selkirk, M, Simms, R, Spiegel, C, Stolldorf, D, Sugden, E, van der Putten, N., van Ommen, T, Verfaillie, D, Vyverman, W., Wagner, B, White, A, Witus, E, and Zwartz, D
- Abstract
A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.
- Published
- 2014
24. Model of facilitation of emotional intelligence to promote wholeness of neophyte critical care nurses in South Africa
- Author
-
Towell, Amanda, Nel, W. E., Muller, A., Towell, Amanda, Nel, W. E., and Muller, A.
- Abstract
This study was undertaken in order to develop a model of facilitation of emotional intel- ligence to promote wholeness in neophyte critical care nurses in South Africa. A theory- generative, explorative, descriptive, contextual research design was used. The model was developed utilising the four steps of theory generation as proposed by Dickoff, James, and Wiedenbach (1968), Chinn and Kramer (2011) and Walker and Avant (2011). Step one dealt with the empirical phase in which the concepts were distilled. The facilitation of inherent affective and mental resourcefulness and resilience was the main concept of the model. Step two comprised the definition and classification of central and related concepts. Step three provides a description of the model. The model operates in three phases namely the dependent phase, partially dependent phase and the independent phase. Step four entailed the description of guidelines for operationalizing the model. During the three phases of the model a new nurse who starts to work in critical care moves from a latent ability to develop an inherent affective and mental resourcefulness and resilience to a state of developing an inherent affective and mental resourcefulness and resilience. This model provides a structured framework for the facilitation of emotional intelligence (EI) to pro- mote wholeness in nurses who commence to work in critical care units.
- Published
- 2015
25. A new genus and species for the globally important, multihost root pathogen <italic>Thielaviopsis basicola</italic>.
- Author
-
Nel, W. J., Wingfield, M. J., de Beer, Z. W., Duong, T. A., and Wingfield, B. D.
- Subjects
- *
FUNGI imperfecti , *THIELAVIOPSIS basicola , *PHYLOGENY , *TAXONOMY , *NUCLEOTIDE sequence - Abstract
The plant pathogenic asexual fungus
Thielaviopsis basicola (Ascomycota) causes black root rot on many important agricultural and ornamental plant species. Since its first description in 1850, this species has had a tumultuous taxonomic history, being classified in many different genera. Thus far, DNA‐based techniques have not played a significant role in identification ofT. basicola and have been used only to confirm its placement in the Microascales. This investigation reconsidered the phylogenetic placement ofT. basicola , using DNA sequence data for six different gene regions. It included 41 isolates identified asT. basicola from 13 geographical locations worldwide. Phylogenetic analyses showed that these isolates grouped in a well‐supported lineage distinct from other genera in the Ceratocystidaceae, here described asBerkeleyomyces gen. nov. The data also provided robust evidence that isolates ofT. basicola include a cryptic sister species. As a result, this report provides a new combination asB. basicola comb. nov. and introduces a new species asB. rouxiae sp. nov. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
26. Conversations among Black staff members at a historically White Afrikaans university campus on issues of race, social justice and reconciliation
- Author
-
Nel, W
- Subjects
Black staff, historically White Afrikaans university, race, social justice, reconciliation, critical discourse approach, transformative resistance - Abstract
In an ethnographically designed study, guided by a critical community psychology framework, Black staff members at a historically White Afrikaans university campus conducted email conversations relating to issues of race, social justice and reconciliation. The conversations were initiated by the author (Black) who mainly used prompts found in the local institutional context to elicit responses from colleagues. A critical discourse approach to thematic analysis of the email conversations was followed. The main findings are: Compared to the potential number of respondents (32 Black staff members or 18% of all faculty staff), very few colleagues (9 or 28% of Black staff members) responded via email to the invitations but, when met in person, all expressed strong views on the topics or prompts used in the initialising emails. The critical discourse approach revealed clear psychopolitical awareness and strong discourses of fear, powerlessness and bitterness, as well as a discourse of non-engagement. These discourses appeared in all three domains of analysis: local, institutional and societal. Theoretical explication is sought mainly in resistance theory for the discourse of non-engagement and the scarcity of responses located in the local domain. Transformative resistance is suggested so that alternative discourses are inculcated, at least, in faculties of education at some historically White Afrikaans university campuses.
- Published
- 2012
27. Gastritis and gastropathy: more than meets the eye
- Author
-
Nel, W
- Abstract
This paper discusses the different types of gastritides and gastropathies, focusing on their wide range of aetiologies.
- Published
- 2012
28. Model of facilitation of emotional intelligence to promote wholeness of neophyte critical care nurses in South Africa
- Author
-
Towell, A., primary, Nel, W. E., additional, and Muller, A., additional
- Published
- 2015
- Full Text
- View/download PDF
29. A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
- Author
-
Bentley, MJ, Ocofaigh, C, Anderson, JB, Conway, H, Davies, B, Graham, AGC, Hillenbrand, CD, Hodgson, DA, Jamieson, SSR, Larter, RD, Mackintosh, A, Smith, JA, Verleyen, E, Ackert, RP, Bart, PJ, Berg, S, Brunstein, D, Canals, M, Colhoun, EA, Crosta, X, Dickens, WA, Domack, E, Dowdeswell, JA, Dunbar, R, Ehrmann, W, Evans, J, Favier, V, Fink, D, Fogwill, CJ, Glasser, NF, Gohl, K, Golledge, NR, Goodwin, I, Gore, DB, Greenwood, SL, Hall, BL, Hall, K, Hedding, DW, Hein, AS, Hocking, EP, Jakobsson, M, Johnson, JS, Jomelli, V, Jones, RS, Klages, JP, Kristoffersen, Y, Kuhn, G, Leventer, A, Licht, K, Lilly, K, Lindow, J, Livingstone, SJ, Massé, G, McGlone, MS, McKay, RM, Melles, M, Miura, H, Mulvaney, R, Nel, W, Nitsche, FO, O'Brien, PE, Post, AL, Roberts, SJ, Saunders, KM, Selkirk, PM, Simms, AR, Spiegel, C, Stolldorf, TD, Sugden, DE, van der Putten, N, van Ommen, T, Verfaillie, D, Vyverman, W, Wagner, B, White, DA, Witus, AE, Zwartz, D, Bentley, MJ, Ocofaigh, C, Anderson, JB, Conway, H, Davies, B, Graham, AGC, Hillenbrand, CD, Hodgson, DA, Jamieson, SSR, Larter, RD, Mackintosh, A, Smith, JA, Verleyen, E, Ackert, RP, Bart, PJ, Berg, S, Brunstein, D, Canals, M, Colhoun, EA, Crosta, X, Dickens, WA, Domack, E, Dowdeswell, JA, Dunbar, R, Ehrmann, W, Evans, J, Favier, V, Fink, D, Fogwill, CJ, Glasser, NF, Gohl, K, Golledge, NR, Goodwin, I, Gore, DB, Greenwood, SL, Hall, BL, Hall, K, Hedding, DW, Hein, AS, Hocking, EP, Jakobsson, M, Johnson, JS, Jomelli, V, Jones, RS, Klages, JP, Kristoffersen, Y, Kuhn, G, Leventer, A, Licht, K, Lilly, K, Lindow, J, Livingstone, SJ, Massé, G, McGlone, MS, McKay, RM, Melles, M, Miura, H, Mulvaney, R, Nel, W, Nitsche, FO, O'Brien, PE, Post, AL, Roberts, SJ, Saunders, KM, Selkirk, PM, Simms, AR, Spiegel, C, Stolldorf, TD, Sugden, DE, van der Putten, N, van Ommen, T, Verfaillie, D, Vyverman, W, Wagner, B, White, DA, Witus, AE, and Zwartz, D
- Abstract
A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20ka, 15ka, 10ka and 5ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse 1a. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorit. © 2014 The Authors.
- Published
- 2014
30. Short communication First rainfall data from the KZN Drakensberg escarpment edge (2002 and 2003)
- Author
-
Nel, W and Sumner, PD
- Abstract
Rainfall measured on the KwaZulu-Natal Drakensberg escarpment, the first from above 2 800m a.s.l., are presented from two locations. Total rainfall at the top of Sani Pass (2 850 m a.s.l.) in the southern Drakensberg was 742 mm in 2002, while the January months of 2002 and 2003 averaged 109 mm. Rainfall on Sentinel Peak (3 165 m a.s.l.) in the northern KZN Drakensberg during 2003 totalled 765 mm and 145 mm was measured in January 2003. Recorded rainfall was marginally lower than, but within 6% of, rainfall recorded at adjacent lower altitude Drakensberg stations over the same period. The number of rain days increased marginally with altitude and the data suggest that even though the amount of rainfall on the escarpment is similar to that at lower altitude, the frequency of rainfall events is higher on the escarpment. Although 2002 and 2003 were dryer than normal years in the region, comparisons between these data and prior estimations, where rainfall was expected to range between 1 500 and 2 000 mm/a, shows that totals for the summit of the escarpment could have been over-estimated in the past. Measurement of rainfall is ongoing. Water SA Vol.31 (3) 2005: pp.399-402
- Published
- 2007
31. AN ANALYST'S GUIDE TO SECTOR-SPECIFIC OPTIMAL PEER GROUP VARIABLES AND MULTIPLES IN THE SOUTH AFRICAN MARKET.
- Author
-
NEL, W. S. and LE ROUX, N. J.
- Subjects
VALUE chains ,FINANCE literature ,SOUTH African economy, 1991- ,EMERGING markets ,BUSINESS valuation - Abstract
In this study a market-based approach was adopted to investigate the valuation performance of 16 multiples over 28 sectors in the South African market. The market-based approach facilitates/enables an evaluation of the ability of multiplesbased modeling to approximate actual share prices on the JSE Securities Exchange. In addition, this study employs principal component analysis-based biplots and correlation monoplots to illustrate the relative valuation performance amongst all 16 multiples over all 28 sectors. The evidence suggests the following: Firstly, none of the peer group variables offered evidence to suggest that they were the optimal choice across all 28 sectors, which implies that the optimal choice of peer group variable is sector-specific, i.e. each of the 28 sectors may have a different optimal peer group variable. Secondly, the superior valuation performance of multiples whose peer groups were based on a combination of valuation fundamentals, as suggested in the finance literature, does not hold on a per sector basis. Thirdly, it was established which multiples, whose construction was based on an optimal peer group variable, performed the most accurate equity valuations in each of the 28 sectors in the South African market. Lastly, to this end, a sector value chain was subsequently created, which ranked each of the 16 multiples according to the valuation precision they exhibited in each of the 28 sectors. The sector value chain, which reflects substantial potential precision gains, ranging from 43.27% to 218.33%, also presents a synopsis of the sector-specific optimal peer group variables to be used in each of the 28 sectors, and provides an empirical guide to analysts in this respect. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
32. Sacrocolpopexy - a report on 262 consecutive operations
- Author
-
Lindeque, B G and Nel, W S
- Abstract
Objectives. This report analyses the outcome and complications of 262 consecutive sacrocolpopexy procedures for the repair of vaginal vault prolapse and enterocele. Methods. From March 1994 to February 2001, 262 patients underwent surgical repair using a standardised retroperitoneal technique. Initially dura mater strips were used and from the 19th patient onwards, Gore-tex soft tissue patch was used to suspend the vaginal apex to the anterior sacral ligament. Halban-type occluding sutures were placed in the pouch of Douglas. All patients were followed up and the minimum duration of follow-up was 16 months. Results. Vaginal vault prolapse was successfully managed in 259 of 262 patients giving a success rate of 98.8%. In addition, 4 patients had a repeat enterocele that required surgical repair. The overall surgical complication rate was low. Erosion of the patch through the vaginal vault occurred in 10 patients, necessitating removal of the patch. Prolapse did not recur in any of these patients. Conclusion. Abdominal sacrocolpopexy is a very successful and safe surgical management of vaginal vault prolapse. (South African Medical Journal: 2002 92(12): 982-985)
- Published
- 2002
33. The influence of constrained fossil fuel emissions scenarios on climate and water resource projections
- Author
-
Ward, J. D., primary, Werner, A. D., additional, Nel, W. P., additional, and Beecham, S., additional
- Published
- 2011
- Full Text
- View/download PDF
34. Short communication: Effect of altitude on erosive characteristics of concurrent rainfall events in the KwaZulu-Natal Drakensberg
- Author
-
Nel, W, primary, Reynhardt, D, additional, and Sumner, P, additional
- Published
- 2010
- Full Text
- View/download PDF
35. AN EMERGING MARKET PERSPECTIVE ON KEY VALUE DRIVERS IN THE VALUATION OF CROSS-BORDER TRANSACTIONS INTO SOUTH AFRICA.
- Author
-
NEL, W. S., BRUWER, B. W., and LE ROUX, N. J.
- Subjects
VALUE engineering ,SUPPLY & demand ,EMERGING markets ,FOREIGN investments ,INTERNATIONAL markets - Abstract
This paper investigates the valuation performance of 16 individual value drivers, from five different value driver categories, in relation to the South African equity market for the period 2001-2010. The research results revealed, among other findings, that headline earnings is by far the most accurate value driver and that, contrary to popular belief, earnings before interest, tax, depreciation and amortization and earnings before interest and tax are only fourth and fifth best alternatives. The evidence also suggests that, when employing multiples to perform equity valuations, a careful selection of value drivers could increase valuation accuracy by as much as 50.03%. [ABSTRACT FROM AUTHOR]
- Published
- 2014
36. Post-operative ventilatory nursing regime of research coronary artery bypass graft patients
- Author
-
Potgieter, H, primary, Uys, H, additional, and Nel, W E, additional
- Published
- 1999
- Full Text
- View/download PDF
37. Factors in decision-making concerning life support therapy
- Author
-
Burger, G, primary, Botes, A C, additional, and Nel, W E, additional
- Published
- 1999
- Full Text
- View/download PDF
38. Gastritis and gastropathy: More than meets the eye.
- Author
-
Nel, W.
- Subjects
- *
GASTRITIS , *ETIOLOGY of diseases , *PATHOLOGY , *GASTROINTESTINAL system , *HELICOBACTER pylori - Abstract
The article discusses the different types of gastritides and gastropathies and their wide range of etiologies. The reason for the poor correlation between the clinical presentation and pathology in the upper gastrointestinal tract is presented. The difference between acute gastritis and chronic gastritis is explained. The types of gastritis and gastropathy discussed include among others acute hemorrhagic gastritis, helicobacter pylori gastritis, autoimmune gastritis and lymphocytic gastritis.
- Published
- 2013
39. Effect of altitude on erosive characteristics of concurrent rainfall events in the northern KwaZulu-Natal Drakensberg.
- Author
-
Nel, W., Reynhardt, D. A., and Sumner, P. D.
- Subjects
- *
RAINFALL , *ALTITUDES , *FOOTHILLS , *NATIONAL parks & reserves , *METEOROLOGICAL precipitation , *SYNOPTIC climatology , *WINTER - Abstract
High-resolution rainfall data from two stations in the northern KwaZulu-Natal Drakensberg provide insight into the effect of altitude on individual rainfall event characteristics. The effect of altitude on the duration and erosivity (rainfall intensity and kinetic energy) of concurrent rainfall on the escarpment and in the foothills is analysed using 5-min interval data for the calendar year 2003. A cumulative total of 229 rainfall events, measured at the Royal Natal National Park station (1 392 m a.m.s.l.) and a temporary station on the escarpment at Sentinel Peak (3 165 m a.m.s.l.), were considered, of which 79 rainfall events were found to fall concurrently at the two stations. The data indicate that the concurrent events generate rainfall for longer on the escarpment, but that the amount of rain produced as well as the intensity at which it falls is less than that in the foothills, both in summer and winter. The escarpment appears to limit erosivity, with only 11 events meeting the set criteria for erosivity in the foothills but failing to meet the same criteria on the escarpment. This decrease in erosivity contrasts with previous models for the Drakensberg that demonstrate higher erosivity in the upper reaches, but concurs with studies in mountainous regions elsewhere which found that erosivity decreases with altitude. It is tentatively suggested that the difference in rainfall characteristics could be related to the sources of precipitation and the manner in which the escarpment zone affects the formation and distribution of rainfall. The paper also highlights the need for further research into the association between rainfall structure and synoptic conditions and the effect that the escarpment has on modifying large-scale rainproducing systems in the KwaZulu-Natal Drakensberg. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
40. Selecting Suitable Coherent Processing Time Window Lengths for Ground-Based ISAR Imaging of Cooperative Sea Vessels.
- Author
-
Gaffar, M. Y. Abdul, Nel, W. A. J., and Inggs, M. R.
- Subjects
- *
IMAGE processing , *SYNTHETIC aperture radar , *COHERENT radar , *IMAGING systems , *ROTATIONAL motion , *RADAR cross sections , *ALGORITHMS , *SHIPS - Abstract
Inverse synthetic aperture radar (ISAR) imaging of sea vessels is a challenging task because their 3-D rotational motion over the coherent processing interval (CPI) often lead to blurred images. The selection of the duration of the CPI, also known as the coherent processing time window length (CPTWL), is critical because it should be short enough to limit the blurring caused by the 3-D rotational motion and long enough to ensure that the desired cross-range resolution is obtained. This paper proposes an algorithm, referred to as the motion-aided CPTWL selector (MACS) algorithm, which selects suitable CPTWLs for ISAR imaging of cooperative sea vessels. The suggested CPTWLs may be used to obtain motion-compensated ISAR images that have the desired medium cross-range resolution and limited blurring due to 3-D rotational motion. The proposed algorithm applied to measured motion data of three different classes of sea vessels: a yacht, a fishing trawler, and a survey vessel. Results show that longer CPTWLs are needed for larger vessels in order to obtain ISAR images with the desired cross-range resolution. The effectiveness of the CPTWLs, suggested by the MACS algorithm, is shown using measured radar data. The suggested CPTWLs may also be used to select an effective initial CPTWL for Martorella/Berizzi's optimum imaging selection algorithm when it is applied to measured radar data of small vessels. Lastly, the proposed technique offers significant computational savings for radar cross section measurement applications where a few high-quality ISAR images are desired from long radar recordings. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
41. Intensity, energy and erosivity attributes of rainstorms in the KwaZulu-Natal Drakensberg, South Africa.
- Author
-
Nel, W. and Sumner, P. D.
- Subjects
- *
RAINFALL frequencies , *RAINSTORMS , *RAINFALL , *NATURAL disasters , *EROSION - Abstract
Rainfall intensity, kinetic energy and erosivity were analysed for 106 erosive storm events at five locations in the KwaZulu-Natal Drakensberg, from late 2001 to early in 2006. The stations cover an altitudinal range of 1060 m to 3165 m a.s.l. and provide the first detailed rainstorm data for the Drakensberg area. Erosive storm events, defined as total rainfall exceeding 12.5 mm and a maximum 5-minute intensity greater than 25mmh-1, are found to vary in duration and depth (total rainfall) with the distribution biased towards shorter, shallower storms. Erosive rainstorms are almost exclusively a summer phenomenon and the attributes of these storms (rainfall intensity, kinetic energy and erosivity) are positively correlated with rainfall depth, but not with storm duration. Inter-station similarities exist with respect to rainfall depths and mean kinetic energy from individual storm events. Altitudinal trends are, however, evident for storm maximum intensity, depths of erosive storms and cumulative kinetic energy. Together with frequency of erosive events and extent of collective erosive effects, all these rainfall attributes decrease with station altitude. Dissimilarities in cumulative kinetic energy and cumulative erosivity can be explained by the lack of erosive events during early and late summer on the escarpment and by significant erosive rains during this period at lower altitudes in the foothills. [ABSTRACT FROM AUTHOR]
- Published
- 2007
42. Intrusions of sub-Antarctic water across the Subtropical Convergence south of Africa.
- Author
-
Nel, W., Holnes, S., and Meiklejohn, K.I.
- Subjects
- *
IGNEOUS intrusions , *CONVERGENCE (Meteorology) - Abstract
The contents of the Cape Basin of the South Atlantic Ocean, southwest of Cape Town, is a melange of water types from a number of different sources. One of the least studied of these water types comes from intrusions of sub-Antarctic water that are associated with the spawning of Agulhas rings. An analysis of a variety of data on the region shows that these intrusions originate along a latitude of 40°S, but only between longitudes of 8° and 22°E. In extreme cases they can extend equatorward beyond the southern tip of Africa. Intrusions take place at least five times per year. Their distinct surface expressions are shown to be but outcrops of water masses that usually are found at greater depths. These vertical perturbations may extend to depths exceeding 1500 m. [ABSTRACT FROM AUTHOR]
- Published
- 2003
43. The percentage of aneuploid cells is significantly correlated with survival in accurately staged patients with stage 1 resected squamous cell lung cancer and long-term follow up
- Author
-
Roland G. J. R. A. Vanderschueren, Conny Stroet-Van Galen, E.C.M. Wisse-Brekelmans, Peter C. Van Bodegom, Jan P. A. Baak, Nel W. Schipper, and S. S. Wagenaar
- Subjects
Oncology ,Cancer Research ,medicine.medical_specialty ,Pathology ,Lung ,business.industry ,Respiratory disease ,Cytogenetics ,Aneuploidy ,Disease ,medicine.disease ,medicine.anatomical_structure ,Mediastinal lymph node ,Internal medicine ,Medicine ,Stage (cooking) ,business ,Lung cancer - Abstract
Previous studies have shown that ploidy is an important prognostic determinant in lung cancer, but in those studies followup was restricted to three years, while patients with Stage 1, 2 and 3 disease and with different histological subtypes were included. Theoretically, these factors could have influenced the findings, especially since aneuploidy strongly correlated with the stage of disease. Because of this, tumor ploidy was studied in surgically resected stage 1 (T1/2, N0M0) squamous cell lung cancer patients with a minimal followup of 6 years. All patients were accurately staged by mediastinal lymph node mapping. Fifty-two from a group of 1539 patients with lung cancer diagnosed between 1980 and 1986 inclusive, fulfilled these criteria. Of these tumors, 23 (44%) were diploid with a 6-year survival of 53% and 29 (56%) were aneuploid with a 6-year survival of 48%. Although diploidy tended to be associated with local relapse of the tumor and aneuploidy with distant metastases, the difference was not significant and neither showed a survival advantage. However, within the aneuploid tumors, there was a significant correlation between the percentage of aneuploid cells and survival, defined as event-free or time to death. Seventeen patients with a percentage of more than 10 had a worse outcome (12 died, 6 years survival 35%), than to the other 12 patients with less than 10% aneuploid cells (2 died, 6-year survival 78%) (Mantel-Cox = 6.04, P = 0.01). This implies that in patients with accurately staged and histologically proven Stage 1 squamous cell lung cancer and long-term follow up, DNA content classified as diploid and aneuploid is not a prognostic factor for survival, but the percentage of aneuploid tumor cells is correlated with the prognosis.
- Published
- 1989
44. Improve economics with GTL integration into oil sands operations.
- Author
-
SALEHI, E., SAVE, S., NEL, W., and ALMQUIST, G.
- Subjects
OIL sands industry ,SHALE gas industry ,GAS prices ,PROFITABILITY ,CETANE number - Abstract
The article discusses the need for integrating Gas to Liquid (GTL) fuel industry with oil sands industry, the future of the GTL industry with developments in shale gas production and change in oil and natural gas prices in North America. The authors mention that oil to gas price ratio determines GTL profitability. They further discuss the economic viability of GTL technology and the environmental benefits of the ultra-clean diesel with high-cetane number produced.
- Published
- 2015
45. Analytical approximations of surface fields induced on convex scatters by exteriorly incident scalar fields
- Author
-
Nel, W J F and Du Plessis, N M
- Subjects
Mathematics and Applied Mathematics - Abstract
The boundary value problems for the Helmholtz equation give rise to boundary integral equations for the unknown surface field or its normal derivative. These integral equations involve the Helmholtz surface potentials in the form of weakly singular surface integrals. This thesis is based on a method of parameterisation of the surface integrals which removes the weak singularities provided that the surface satisfies certain convexity conditions. Firstly this method of parameterisation is applied to investigate the properties of the Helmholtz surface potentials on convex surface elements, and some new proofs are given. The theory is then applied to the boundary integral equations which arise when a scalar field is incident on a bounded scatterer. The surface integrals in these integral equations are Helmholtz potentials and can be regularised by suitable parameterisation. It is assumed that the unknoWn density function is an analytical function on the boundary of the scatterer, and can therefore be expanded as a Taylor series at any point of the surface. If this expansion is substituted into the regularised integral equation and if the operations of integration and summation are formally interchanged, then the end result is a partial differential equation of infinite order involving only the field coordinates and having analytical coefficients. However, if the Taylor expansions are truncated then partial differential equations of finite orders result. The view is taken that analytical solutions of such differential equations of finite orders can serve as _approximations for the surface field or its normal derivative provided that suitable initial conditions are imposed to ensure uniqueness. On the other hand the general solution of such a differential equation can serve as a local approximation at any point on the surface. Some basic properties of the differential equations and their solutions, called analytical approximations, are discussed and the theory is then applied to the problem of acoustic scattering from a sound hard sphere.
- Published
- 1989
46. Model of facilitation of emotional intelligence to promote wholeness of neophyte critical care nurses in South Africa
- Author
-
Towell, Amanda, Nel, W. E., Muller, A., Towell, Amanda, Nel, W. E., and Muller, A.
- Abstract
Towell, A., Nel, W. E., & Muller, A. (2015), Model of facilitation of emotional intelligence to promote wholeness of neophyte critical care nurses in South Africa. Health SA Gesondheid, 20, 1-10. Available here
47. Flame Ionization Detector for Gas Chromatography
- Author
-
HARLEY, J., primary, NEL, W., additional, and PRETORIUS, V., additional
- Published
- 1958
- Full Text
- View/download PDF
48. Viability of GTL for the North American gas market.
- Author
-
SALEHI, E., NEL, W., and SAVE, S.
- Subjects
- *
GAS industry , *HORIZONTAL gas well drilling , *HYDRAULIC fracturing , *SHALE gas - Abstract
The article examines the viability of gas-to-liquids (GTL) process for the gas market in North America. It discusses the condition of the gas market wherein the developments in horizontal drilling and hydraulic fracturing have expanded producers ability to recover oil and natural gas from shale plays. It offers information on shale gas, the challenges in monetizing gas resources, and heat removal.
- Published
- 2013
49. Global rainfall erosivity assessment based on high-temporal resolution rainfall records
- Author
-
Bofu Yu, Mark A. Nearing, Victoria Naipal, Yoav Levi, Katrin Meusburger, Paulo Tarso Sanches de Oliveira, Mohsen Zabihi, Cristiano Ballabio, Christian Birkel, N. Chattopadhyay, Andrey V. Gorobets, Seyed Hamidreza Sadeghi, Andreas Klik, Chiyuan Miao, Panos Panagos, Jinren Ni, Carlos A. Bonilla, Martino Boni, Werner Nel, Nazzareno Diodato, Pasquale Borrelli, Kristof Van Oost, Gennady A. Larionov, Sergey F. Krasnov, Jae E. Yang, Mohamed Meddi, Zeinab Hazbavi, Hassan Al Dashti, Natalia Hoyos, Gunay Erpul, Kyoung Jae Lim, European Commission - Joint Research Centre [Ispra] (JRC), University of Basel (Unibas), Griffith University [Brisbane], Universität für Bodenkultur Wien = University of Natural Resources and Life [Vienne, Autriche] (BOKU), Kangwon National University, College of Environmental Sciences and Engineering [Peking], Peking University [Beijing], College of Global Change and Earth System Science (GCESS), Beijing Normal University (BNU), India Meteorological Department, Partenaires INRAE, Tarbiat Modares University [Tehran], MSU Faculty of Geography [Moscow], Lomonosov Moscow State University (MSU), Israel Meteorological Service, Ankara University, Universidad de Costa Rica (UCR), Universidad del Norte, Barranquilla, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Universidade Federal de Mato Grosso do Sul (UFMS), Departamento de Ingenierıa Hidraulica y Ambiental, Pontificia Universidad Católica de Chile (UC), Université Saâd Dahlab Blida 1 (UB1), University of Fort Hare, Department of Meteorology [koweit], Met European Research Observatory (MetEROBS), Université Catholique de Louvain = Catholic University of Louvain (UCL), USDA Agricultural Research Service [Maricopa, AZ] (USDA), United States Department of Agriculture (USDA), University of Natural Resources and Life Sciences [Wien] (BOKU), Université médicale de Vienne, Autriche, University of Costa Rica, Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université de Saâd Dahlab [Blida] (USDB ), UCL - SST/ELI/ELIC - Earth & Climate, Panagos, P., Borrelli, P., Meusburger, K., Yu, B., Klik, A., Lim, K. J., Yang, J. E., Ni, J., Miao, C., Chattopadhyay, N., Sadeghi, S. H., Hazbavi, Z., Zabihi, M., Larionov, G. A., Krasnov, S. F., Gorobets, A. V., Levi, Y., Erpul, G., Birkel, C., Hoyos, N., Naipal, V., Oliveira, P. T. S., Bonilla, C. A., Meddi, M., Nel, W., Al Dashti, H., Boni, M., Diodato, N., Van Oost, K., Nearing, M., and Ballabio, C.
- Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,Multidisciplinary ,010504 meteorology & atmospheric sciences ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,Cold climate ,Science ,010501 environmental sciences ,15. Life on land ,01 natural sciences ,Article ,13. Climate action ,Kriging ,Soil retrogression and degradation ,Tropical climate ,East africa ,Temperate climate ,Environmental science ,High temporal resolution ,Medicine ,South east asia ,Physical geography ,0105 earth and related environmental sciences - Abstract
The exposure of the Earth’s surface to the energetic input of rainfall is one of the key factors controlling water erosion. While water erosion is identified as the most serious cause of soil degradation globally, global patterns of rainfall erosivity remain poorly quantified and estimates have large uncertainties. This hampers the implementation of effective soil degradation mitigation and restoration strategies. Quantifying rainfall erosivity is challenging as it requires high temporal resolution(−1 h−1 yr−1, with the highest values in South America and the Caribbean countries, Central east Africa and South east Asia. The lowest values are mainly found in Canada, the Russian Federation, Northern Europe, Northern Africa and the Middle East. The tropical climate zone has the highest mean rainfall erosivity followed by the temperate whereas the lowest mean was estimated in the cold climate zone.
- Published
- 2017
50. Ground-based ISAR imaging of cooperative and non-cooperative sea vessels with 3-D rotational motion
- Author
-
Gaffar, Mohammed Yunus Abdul, Inggs, Michael, and Nel, W A J
- Subjects
Electrical Engineering - Abstract
Includes bibliographical references (leaves 175-188)., Inverse Synthetic Aperture Radar (ISAR) images of sea vessels are a rich source of information for radar cross section (RCS) measurement and ship classification. However, ISAR imaging of sea vessels is a challenging task because the 3-D rotational motion of such vessels often gives rise to blurring. Blurry ISAR images are not desirable because they lead to inaccurate parameter estimation, which reduces the probability of correct classification. The objective of this thesis is to explain how 3-D rotational motion causes blurring in ISAR imagery and to develop effective techniques for imaging cooperative and non-cooperative sea vessels for RCS measurement and ship-classification purposes respectively. Much research has been done to investigate the effect of 3-D rotational motion on an ISAR image under the assumption that an object's axis of rotation is constant over the coherent processing interval (CPI). In this thesis, a new quaternion-based system model is proposed to characterise the amount of blurring in an ISAR image when a sea vessel possesses 3-D rotational motion over a CPI. Simulations were done to characterise the migration of a scatterer through Doppler cells due to the time-varying nature of the Doppler generating axis of rotation. Simulation results with realistic 3-D rotational motion show substantial blurring in the cross-range dimension of the resulting ISAR image, and this blurring is attributed to the time-varying nature of the angle of the Doppler generating axis of rotation and the object's rotation rate over the CPI.
- Published
- 2009
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