121 research outputs found
Corrigendum for: Patorani local knowledge system in fisheries resources conservation education in Galesong District South Sulawesi
No full textWe sincerely express our apology for the changes in the author list in the article entitled Patorani local knowledge system in fisheries resources conservation education in Galesong District South Sulawesi. This article was published on DOI: 10.17977/um017v28i12023p52-63, with the authors list consisting of Hasriyanti, Rusdi, Alonge Titus Adeyemi, Michel E. D. Chaves, and Erman Syarif. However, Michel E. D. Chaves issue a complaint regarding his involvement during the research and paper completion. He did not agree to the inclusion of his name in the author list. We have contacted the corresponding author for confirmation. Besides, the co-author has also confirmed the mistake in the writing of one of the author’s names, Alonge Titus Adeyemi, which should be Titus Adeyemi Alonge. The corresponding author has submitted a letter of author contribution signed by Hasriyanti, Rusdi, Titus Adeyemi Alonge, and Erman Syarif. The original article has been revised, and reasonable effort should be made to remove all references to this article
Portraits for an eagle: a festschrift in honour of Femi Osofisan
No full textTo mark the 60th birthday of Femi Osofisan, this unique collection of essays by friends and critics pays tribute to his many achievements as a director, teacher, essayist, novelist, poet, critic and one of the foremost playwrights from Africa. The essays provide an important insight into the man,his work and his valuable contributions to theatre and literature in Africa.
Femi Osofisan has taught, directed and had his plays performed in several countries including Australia, Canada, Germany, Ghana, Sierra Leone, Jamaica, Lesotho, Sri Lanka, United Kingdom and the USA. Author of more than fifty plays, two books for junior readers, four works of fiction, four collections of poetry anf four volumes of essays, Osofisan also has popular columns in a number of Nigerian newspapers. Currently the President of the Nigerian Centre of International PEN and a Patron of the Pan-African Writers' Association, he has been the President of the Association of Nigerian Authors. Osofisan is currently a Professor of Drama at the University of Ibadan, Nigeria.
Portraits For An Eagle is a definitive tribute to a man of the theatre. Contributors include fellow writers, distinguished academics and critics like Biodun Jeyifo, James Gibbs, Olu Obafemi, Barbara Goff and Martin Banham
Adebiyi etal: absorption of shortwave radiation by North African dust
No full textThe codes and datasets contained here are for the paper with the information below
Titled: "North African dust absorbs substantially less solar radiation than estimated by climate models and remote-sensing retrievals"
Author: Adeyemi A. Adebiyi, Yue Huang, Bjørn H. Samset and Jasper F. Kok
Please see the ReadMe.txt for additional details.
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Corresponding Authors:
Adeyemi Adebiyi
Email: [email protected];
Department of Life and Environmental Sciences,
University of California-Merced,
5200 North Lake Road Merced, CA 95343
Portraits for an eagle: a festschrift in honour of Femi Osofisan
No full textTo mark the 60th birthday of Femi Osofisan, this unique collection of essays by friends and critics pays tribute to his many achievements as a director, teacher, essayist, novelist, poet, critic and one of the foremost playwrights from Africa. The essays provide an important insight into the man,his work and his valuable contributions to theatre and literature in Africa.
Femi Osofisan has taught, directed and had his plays performed in several countries including Australia, Canada, Germany, Ghana, Sierra Leone, Jamaica, Lesotho, Sri Lanka, United Kingdom and the USA. Author of more than fifty plays, two books for junior readers, four works of fiction, four collections of poetry anf four volumes of essays, Osofisan also has popular columns in a number of Nigerian newspapers. Currently the President of the Nigerian Centre of International PEN and a Patron of the Pan-African Writers' Association, he has been the President of the Association of Nigerian Authors. Osofisan is currently a Professor of Drama at the University of Ibadan, Nigeria.
Portraits For An Eagle is a definitive tribute to a man of the theatre. Contributors include fellow writers, distinguished academics and critics like Biodun Jeyifo, James Gibbs, Olu Obafemi, Barbara Goff and Martin Banham
Synthesis, characterization and antimicrobial studies of organotin(IV) complexes of N-methyl-N-phenyldithiocarbamate
No full textOrganotin(IV) dithiocarbamate complexes have shown a large spectrum of biological activities, which includes antioxidants, anti-inflammatory, antimicrobial, antituberculosis, anticancer and antiviral. In this report, organotin(IV) dithiocarbamate complexes derived from N-methyl-N-phenyldithiocarbamate (L) and organotin have been synthesized. The complexes which were represented as C4H9(Cl)SnL2 (1), C6H5(Cl)SnL2 (2), (CH3)2SnL2 (3), (C4H9)2SnL2 (4) and (C6H5)2SnL2 (5), were characterized by spectroscopic techniques (FTIR, 1H, 13C and 119Sn NMR), elemental and thermal analyses (TGA and DTG). The structures of complexes (3) and (4) were further established by X-ray single crystal diffraction. The structures, in both complexes, gave a distorted octahedral geometry around the tin center. This is due to the longer bond length of one of the SnS bonds within the complexes compared to others, and also the electronic and steric demands caused by the alkyl substituents on the tin atom. The complexes exhibited varied antimicrobial activity against S. Aureus, B. cerues, K. pneumonia, P. aeruginosa, E. coli, C. albican and A. flavus. Complex 5 displayed the best antimicrobial activities compared to the other organotin complexes, and this could be attributed to the planar phenyl group attached to the tin center causing an increase in the lipophilicity of the complex through the lipid bilayer of the bacteria organism
Changing Minds: Towards Water-Based Architecture and Public Space for the Future Urban Archipelago
No full textThis blog contribution supports the Urban Archipelago expo at Nieuwe Instituut (NI) in Rotterdam, designed to consist of four elements: a map, a view, a model, and a series of films that depicted a future of living with water, as well as a booklet that documented student work. The expo has been part of the Water Cities Rotterdam, which opened with the work of Kunlé Adeyemi (NLÉ) on 13 May 2023.History, Form & AestheticsUrban Desig
Organotin(IV) Dithiocarbamate Complexes: Chemistry and Biological Activity
No full textSignificant attention has been given to organotin(IV) dithiocabamate compounds in recent times. This is due to their ability to stabilize specific stereochemistry in their complexes, and their diverse application in agriculture, biology, catalysis and as single source precursors for tin sulfide nanoparticles. These complexes have good coordination chemistry, stability and diverse molecular structures which, thus, prompt their wide range of biological activities. Their unique stereo-electronic properties underline their relevance in the area of medicinal chemistry. Organotin(IV) dithiocabamate compounds owe their functionalities and usefulness to the individual properties of the organotin(IV) and the dithiocarbamate moieties present within the molecule. These individual properties create a synergy of action in the hybrid complex, prompting an enhanced biological activity. In this review, we discuss the chemistry of organotin(IV) dithiocarbamate complexes that accounts for their relevance in biology and medicine
Synthesis characterization and in vitro studies of some transition metal complexes of artesunate and chloroquine diphosphate antimalarial drugs
No full textMSc (Chemistry)See the attached abstract belo
In Vitro Cytotoxicity and Antioxidant Studies of Dovyallis caffra-Mediated Cassiterite (SnO2) Nanoparticles
No full textMany medicinal plants found in Africa, such as Dovyallis caffra, have been reported to contain various bioactive compounds, which have been found to reduce metal salts into their corresponding metal-based nanoparticles. In this paper, the evaluation of synthesis, characterization, and biological properties of Dovyallis caffra-mediated cassiterite (SnO2) nanoparticles was carried out. The physicochemical properties of the synthesized material were investigated using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The characterization studies revealed that the material possessed a single tetragonal cassiterite SnO2 phase, having a cluster-like foam appearance and an irregular spherical morphology with diameters ranging from 6.57 to 34.03 nm. The biological screening revealed that the prepared cassiterite (SnO2) nanoparticles exhibited cytotoxicity against the MCF-7 breast cancer cells, with an IC50 value of 62.33 µg mL−1, better than the standard drug 5-fluorouracil, with an IC50 value of 71.21 µg mL−1. The radical scavenging potential of the nanoparticles, using the DPPH assay, showed that it possessed a slightly better activity than ascorbic acid, a common antioxidant. These results suggest that the Dovyallis caffra-mediated cassiterite (SnO2) nanoparticles possess the potential to simultaneously generate and scavenge excess ROS, which in turn results in the exhibition of good cytotoxicity and antioxidant properties
Synthesis, characterization and biological studies of some organotin-dithiocarbamate complexes
No full textPhD (Chemistry), North-West University, Mafikeng Campus, 2019Organotin(IV)dithiocarbamate owe their functionality and usefulness to the individual attributes of the organotin and the dithiocarbamate moieties. The synergy exhibited by these moieties has resulted in the enhanced biological activity of the hybrid molecule. This thesis reports the synthesis, characterization and evaluation of the biological properties (including antimicrobial, antioxidant an~ anticancer activities) of series of organotin(IV) dithiocarbamate complexes. Organotin(IV) chlorides of various alky and aryl groups [RnSnCl4_n] (n = 1, 2; R = CH3, C4H9, C6Hs) were utilized, while the dithiocarbamate ligands [-S2CNRR'] (R= H, CH3, C2H5, C4H9,
C3Hs and R'= C6Hs, C6Hs-CH2, CH3-C6Hs, C2Hs-C6Hs, C3Hs) were constituted of different alkyl, allyl and aryl substituents, resulting in array of compounds with different stereochemistry. All the complexes were characterized using spectroscopic techniques (FTIR, 1H and 13C and 119Sn NMR) and elemental analysis, and a few of them were further characterized by single crystal X-ray diffraction. The thermal decomposition properties of the complexes were studied using thermogravimetric analyser, and they displayed varying decomposition patterns to give tin sulfide residue of different phases. The antimicrobial properties of the complexes were studied using some gram positive bacteria (Bacillus cereus and Staphylococcus aureus), gram negative bacteria (Escherichia coli, Klebsiella pneumonia and Pseudomonas aeruginosa) and some fungi
(Candida albicans and Aspergillus jlavus). They showed great potential as antimicrobial agents better than their respective ligands, and compared favorably with other standard drugs used as control. The complexes also exhibited potentials as antioxidant agents from the study carried out using 2,2-diphenyl-l-picrylhydrazyl (DPPH) and reducing power assays methods. Furthermore, the preliminary in vitro cytotoxicity activity study of the complexes was tested against tumor cell line human cervix carcinoma (HeLa). Activity ranged from very good to moderate, for all tested complexes. These complexes could be useful lead compounds m antibiotic, antioxidant and anticancer studies.Doctora
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