Institution
University of South Africa
Education•Pretoria, South Africa•
About: University of South Africa is a education organization based out in Pretoria, South Africa. It is known for research contribution in the topics: Context (language use) & Population. The organization has 8478 authors who have published 19960 publications receiving 237688 citations. The organization is also known as: Unisa.
Papers published on a yearly basis
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TL;DR: The fact that exogenous application of ABA to plant roots caused the same effect as lumichrome on leaf stomatal functioning suggests molecular cross-talk in plant response to environmental stimuli.
Abstract: Lumichrome and riboflavin are novel molecules from rhizobial exudates that stimulate plant growth. Reported studies have revealed major developmental changes elicited by lumichrome at very low nanomolar concentrations (5 nM) in plants, which include early initiation of trifoliate leaves, expansion of unifoliate and trifoliate leaves, increased stem elongation and leaf area, and consequently greater biomass accumulation in monocots and dicots. But higher lumichrome concentration (50 nM) depressed root development and reduced growth of unifoliate and second trifoliate leaves. While the mechanisms remain unknown, it is possible that lumichrome released by rhizobia induced the biosynthesis of classical phytohormones that caused the observed developmental changes in plants. We also showed in earlier studies that applying either 10 nM lumichrome, 10 nM ABA, or 10 ml of infective rhizobial cells (0.2 OD600) to roots of monocots and dicots for 44 h produced identical effects, which included decreased stomatal conductance and leaf transpiration in Bambara groundnut, soybean, and maize, increased stomatal conductance and transpiration in cowpea and lupin, and elevated root respiration in maize (19% by rhizobia and 20% by lumichrome). Greater extracellular exudation of lumichrome, riboflavin and indole acetic acid by N2-fixing rhizobia over non-fixing bacteria is perceived to be an indication of their role as symbiotic signals. This is evidenced by the increased concentration of lumichrome and riboflavin in the xylem sap of cowpea and soybean plants inoculated with infective rhizobia. In fact, greater xylem concentration of lumichrome in soybean and its correspondingly increased accumulation in leaves was found to result in dramatic developmental changes than in cowpea. Furthermore, lumichrome and riboflavin secreted by soil rhizobia are also known to function as (i) ecological cues for sensing environmental stress, (ii) growth factors for microbes, plants, and humans, (iii) signals for stomatal functioning in land plants, and (iv) protectants/elicitors of plant defense. The fact that exogenous application of ABA to plant roots caused the same effect as lumichrome on leaf stomatal functioning suggests molecular cross-talk in plant response to environmental stimuli.
61 citations
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TL;DR: In this paper, the effect of ICT on female economic participation in sub-Saharan Africa over the period 2004-2014 is assessed. And the authors show that enhancing ICT beyond certain thresholds is necessary for ICT to mitigate inequality in order to enhance gender economic participation.
61 citations
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TL;DR: Oral nutritional supplementation is more effective compared to nutrition education in improving nutritional status in patients with Alzheimer's disease.
Abstract: Background
Weight loss in patients with Alzheimer's disease (AD) is a common clinical manifestation that may have clinical significance.
61 citations
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TL;DR: The authors explored the relationship between the employability and career support satisfaction and emotional intelligence of a convenience sample of predominantly black (N = 590) South African adolescents (mean age 17, males 43, females 57%).
Abstract: This study explored the relationship between the employability and career support satisfaction and emotional intelligence of a convenience sample of predominantly black (N = 590) South African adolescents (mean age 17, males 43%, females 57%). Data were collected using the South African Employability Inventory (Beukes, 2009) and the Assessing Emotions Scale (Schutte, Malouff, & Bhullar, 2007). A survey design and quantitative statistical procedures were used to achieve the research objective. Multiple regression analyses indicated that emotional intelligence contributes significantly to explaining the proportion of variance in the participants' employability scores. Emotional intelligence and employability were also significantly related to the participants' satisfaction with the career preparation support they received. The findings may be used to inform career services for young adults preparing for the world of work.
61 citations
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TL;DR: Anti-biofilm studies confirmed that TB MSN effectively inhibits biofilm formation and production of extracellular polymeric substances by P. aeruginosa and S. aureus.
Abstract: In the present study, the antimicrobial and antibiofilm efficacy of toluidine blue (TB) encapsulated in mesoporous silica nanoparticles (MSN) was investigated against Pseudomonas aeruginosa and Sta...
61 citations
Authors
Showing all 8743 results
Name | H-index | Papers | Citations |
---|---|---|---|
Alvaro Avezum | 93 | 279 | 48888 |
Jordan J. Louviere | 93 | 356 | 38739 |
Jürgen Eckert | 92 | 1368 | 42119 |
Simon Henry Connell | 83 | 506 | 25147 |
Elina Hyppönen | 81 | 258 | 33011 |
David Wilkinson | 80 | 631 | 27578 |
Béla Bollobás | 78 | 566 | 34767 |
Richard A. Matzner | 72 | 317 | 16389 |
Tim Olds | 71 | 412 | 21758 |
Nicolin Govender | 71 | 412 | 18740 |
Paul A. Webley | 70 | 374 | 18633 |
Dusan Losic | 70 | 398 | 16550 |
Alexander Shapiro | 70 | 252 | 26450 |
Kerin O'Dea | 69 | 359 | 16435 |
Shrikant I. Bangdiwala | 68 | 359 | 21650 |