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Acacia Karoo - Adelaide (South Arica)

- Pringle,Thomas (1789-1834)

Authors: Pringle,Thomas (1789-1834)
Date: 1822
Subjects: Acacia karroo -- South Africa -- Adelaide , Trees -- South Africa
Language: English
Type: mixed material , essay
Identifier: http://hdl.handle.net/10962/109175 , vital:33082
Description: Transcript: "1822 Thomas Pringle, 1835 April. In The Koonap River Valley, Adelaide, E.Cape. p.126. "Among the mimosa trees (i.e. thorntrees) sprinkled over the meadows, or lower bottoms, the traces of their (i.e. elephant) operations were not less apparent. Immense numbers of these trees had been torn out of the ground and placed in an inverted position in order to enable the animals to browse at their ease on their juicy roots which form a favourite part of their food. I observed that, in numerous instances, when the trees were of considerable size, The elephant had employed one of his tusks, exactly as he would use a crowbar, thrusting it under The roots to loosen their hold on The earth before he attempted to tear them up with his proboscis, many of the larger mimosas had resisted all their efforts, and, indeed, it is only after rains that they can successfully attempt the operation."
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What is a co-operative?

- Crankshaw, Paul

Authors: Crankshaw, Paul
Date: [Date of publication not identified]
Subjects: Cooperative societies -- South Africa , Producer cooperatives -- South Africa , Consumer cooperatives -- South Africa
Language: English
Type: text , book
Identifier: http://hdl.handle.net/10962/75688 , vital:30448
Description: The word ‘co-operative’ means to work together for a common goal. A co-operative is a group of people who together own and control an organisation or a business for the benefit of its members. A co-operative is democratic, and so the members of the co-operative are responsible to each other. They work for themselves; and together they decide how to run the co-operative and how to share the profits. , This booklet was put together by members of Cope, with the help of Paul Crankshaw (editing and layout), Leslie Lawson (photographs and interviews) and Sue Beattie (drawings)
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(Ferrocenylpyrazolyl)zinc(II) benzoates as catalysts for the ring opening polymerization of ε-caprolactone

- Obuah, Collins, Lochee, Yemanlall, Jordaan, Johan H L, Otto, Daniel P, Nyokong, Tebello, Darkwa, James

Authors: Obuah, Collins , Lochee, Yemanlall , Jordaan, Johan H L , Otto, Daniel P , Nyokong, Tebello , Darkwa, James
Language: English
Type: Article
Identifier: vital:7264 , http://hdl.handle.net/10962/d1020273
Description: The reaction of Zn(OAc)2 and C6H5COOH or 3,5-NO2-C6H3COOH with 3-ferrocenylpyrazolyl-methylenepyridine (L1), 3-ferrocenyl-5-methylpyrazolyl-methylenepyridine (L2), 3-ferrocenylpyrazolyl-ethylamine (L3) and 3-ferrocenyl-5-pyrazolyl-ethylamine (L4) afford the corresponding complexes [Zn(C6H5COO)2(L1)] (1), [Zn(C6H5COO)2(L2)] (2), [Zn(3,5-NO2-C6H3COO)2(L1)] (3), [Zn(3,5-NO2-C6H3COO)2(L2)] (4), [Zn(C6H5COO)2(L3)] (5), [Zn(C6H5COO)2(L4)] (6), [Zn(3,5-NO2-C6H3COO)2(L3)] (7) and [Zn(3,5-NO2-C6H3COO)2(L4)] (8). These complexes behave as catalysts for the ring opening polymerization of ɛ-caprolactone to produce polymers with molecular weight that range from 1480 to 7080 g mol−1 and exhibited moderate to broad PDIs. Evidence of these complexes acting as catalysts was obtained from both the polymerization data and kinetic studies. The polymerization data show that variation of the [CL]/[C] from 100 to 800 produced PCL with relatively the same molecular weight indicative of a catalyst behavior. The appearance of induction period in kinetic plots strengthens the fact that these complexes are catalysts rather than initiators. MALDI-TOF MS and 1H NMR data show di-hydroxy end groups, which support the coordination mechanism rather than insertion mechanism. To understand the broad PDIs obtained for some of the polymer, the electronic properties of the zinc complexes were investigated using cyclic voltammetry. The results show that the zinc complexes containing amine based ligands are highly electrophilic therefore making them unstable, hence the broad PDIs observed for zinc complexes containing amine based ligands. Among the eight complexes investigated, complex 7 is the most active catalyst with kp value of 1.18 × 10−7 h−1 mol−1 at 110 °C. , Original publication is available at http://dx.doi.org/10.1016/j.poly.2015.02.007
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2009/2010 CEO (Celebrating excellence in organisations) Most Influential Women in Business and Government (MIW) in the Education and Teaching Sector

- Rhodes University

Authors: Rhodes University
Subjects: Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7178 , http://hdl.handle.net/10962/d1006184 , Nyokong, Tebello
Description: Professor Tebello Nyokong was awarded the 2009/2010 CEO (Celebrating excellence in organisations) Most Influential Women in Business and Government (MIW) in the Education and Teaching Sector and was named as a runner-up in the Quality of Life category of the Department of Science and Technology's (DST) 2009 Distinguished Woman Scientist Award. Holding a DST/NRF South African Research Chairs Initiative Chair in Medicinal Chemistry and Nanotechnology, she is also the Director of the DST/Mintek Nanotechnology Innovation Centre (NIC) for Sensors. Her pioneering research into photodynamic therapy to harness light for cancer therapy and the early detection of human diseases and environmental clean-up continues to draw attention for more reasons than are immediately apparent.
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