scholarly journals Rapid radiation of angraecoids (Orchidaceae, Angraecinae) in tropical Africa characterised by multiple karyotypic shifts under major environmental instability

2021 ◽  
Vol 159 ◽  
pp. 107105
Author(s):  
João N.M. Farminhão ◽  
Simon Verlynde ◽  
Esra Kaymak ◽  
Vincent Droissart ◽  
Murielle Simo-Droissart ◽  
...  
Keyword(s):  
Tropical Africa ◽  
Rapid Radiation ◽  
Environmental Instability

Drug Abuse in Schools

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Geoffrey Karimi Njogu
Keyword(s):  
Drug Abuse ◽  
Critical Analysis ◽  
Participant Observation ◽  
Not Given ◽  
Final Solution ◽  
Tropical Africa ◽  
Major Threat ◽  
Decisive Action ◽  
Drug Challenge ◽  
Opening Up

The article sets out to unveil the challenge of drugs in Njega and Kamuiru secondary schools of Kenya. With drug challenge becoming the single major threat to the entire education system in tropical Africa, the sampling of the two schools will help in opening up the matter for decisive action by the relevant stakeholders. Methodologically, the article begins by theorizing the issues regarding drug menace as it wonders: Why do teens engage in this vice? What are the practical effects of drug abuse? And more importantly, what can we do to arrest the challenge? Even though the article has not given the final solution on how it can comprehensively be tackled, it has however opened up possibilities that can lead to the final onslaught. The materials in this article are gathered via oral interviews, some selected readings, participant observation especially through visiting the specific sites, and through critical analysis.

Islam and Colonial Rule in Lagos

1995 ◽  
Vol 12 (1) ◽  
pp. 66-80
Author(s):  
Olakunle A. Lawal
Keyword(s):  
Twentieth Century ◽  
Colonial Rule ◽  
Muslim Community ◽  
Tropical Africa ◽  
Southwestern Nigeria ◽  
Urban Settlement ◽  
Islam And Politics ◽  
British Rule ◽  
History Of ◽  
Process Of Urbanization

IntroductionThis essay provides an explanation of the dynamics of the interactionbetween Islam and politics by placing emphasis on the role played byMuslims in the collision of traditionalism and British rule as colonialismtook root in Lagos. The focus is on the development of a political schismwithin the nascent Muslim community of metropolitan Lagos at the startof the twentieth century up until the end of the 1940s. It highlights therole of Islam in an emerging urban settlement experiencing rapid transformationfrom a purely rural and traditional center into a colonial urbancenter. The essay is located within the broader issues of urban change andtransition in twentieth-century tropical Africa. Three major developments(viz: the central mosque crisis, the Eleko affair, and the Oluwa land case)are used as the vehicles through which the objectives of the essay areachieved.The introduction of Islam into Lagos has been studied by T. G. O.Gbadamosi as part of the history of Islam in southwestern Nigeria. Thisepic study does not pay specific attention to Lagos, devoted as it is to thegrowth of Islam in a far-flung territory like the whole of modem southwesternNigeria. His contribution to a collection of essays on the historyof Lagos curiously leaves out Islam’s phenomenal impact on Lagosianpolitics during the first half of the twentieth century. In an attempt to fillthis gap, Hakeem Danmole’s essay also stops short of appreciating the fundamentallink between the process of urbanization, symbolized in this caseby colonial rule, and the vanguard role played by Muslims in the inevitableclash of tradition and colonial rule in Lagos between 1900 and 1950.

UJI AKTIVITAS ANTIOKSIDAN FRAKSI N-HEKSAN DAUN AFRIKA (Vernonia amygdalina Del.) DENGAN METODE DPPH

2020 ◽  
Vol 5 (2) ◽  
pp. 250-257
Author(s):  
Nurul Fatimah ◽  
◽  
Reksi Sundu
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Free Radicals ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Hexane Fraction ◽  
Phytochemical Screening ◽  
Vernonia Amygdalina ◽  
Tropical Africa ◽  
Ic50 Value

Free radicals and reactive species are widely believed to contribute to the development of several diseases by causing oxidative stress and eventually oxidative. Vernonia amygdalina (Astereacea) is a small shrub or tree between 1 and 5m high growing throughout tropical Africa. Plants are generally known as bitter leaves is well cultivated and is a general market for merchandise in several countries. The purpose of this study was to determine the antioxidant activity of hexane fraction from ethanol extract od Frican leaves (Vernonia amygdalina Del.). The method used in this study was the DPPH (1,1-Diphenil-2-Picrylhydrazyl) method. The result of phytochemical screening showed that ethanolic extract of African leaves contained a composition of secondary metabolites of alkaloids, flavonoids, tannins, steroids/triterpenoids and saponins. The antioxidant activity of the extract of n-hexane fraction was classified as very weak with an IC50 value of 317.98 ppm.

Study of Ethno-Botanical Flora of Dakingari, Kebbi State Nigeria, West Tropical Africa

2016 ◽  
Vol 2 (5) ◽  
pp. 22
Author(s):  
Dharmendra Singh
Keyword(s):  
Indigenous Knowledge ◽  
Tropical Africa ◽  
Questionnaire Method ◽  
West Tropical Africa

The present research is an attempt to study the ethno-botanical flora of Dakingari, Kebbi State, Nigeria. The study was conducted from July 2014 to June 2015 villages of Dakingari. The used of questionnaire method was used for obtaining information of the indigenous knowledge of plants that are used traditionally. The results were spreads in about 31 families, 45 genera and 53 species of angiospermic families. They are Amaranthaceae 2 species, Anacardiaceae 3species, Annonaceae 1 species, Asclepiadaceae 2 species, Asteraceae (Compositae) 2 species, Balanitaceae 1 species, Bombacaceae 1 species, Caesalpinaceae 7 species, Caricaceae 1 species, Capparaceae 1 species, Combretaceae 4 species, Convolvulaceae 1 species, Cucurbitaceae 1 species, Ebenaceae 1 species, Euphorbiaceae  4 species,  Lilliaceae 1 species, Malvaceae 2 species, Meliaceae 1 species, Mimosaceae 2 species,  Musaceae 1 species, Moringaceae 1 species, Mrytaceae  2 species,  Nymphaeceae 1 species, Olacaceae 1 species,  Pediliaceae 2 species, Poaceae 2 species, Rubiaceae 2 species, Sapindaceae 1 species, Sapotaceae 1 species, Sterculiaceae 1 species and Verbanaceae 1 species.

The Politics of Agriculture in Tropical Africa

1985 ◽  
Vol 63 (5) ◽  
pp. 1134
Author(s):  
Jennifer Seymour Whitaker ◽  
Jonathan Barker
Keyword(s):  
Tropical Africa

Phylogeny of hymenolepidids (Cestoda: Cyclophyllidea) from mammals: sequences of 18S rRNA and COI genes confirm major clades revealed by the 28S rRNA analyses

2021 ◽  
Vol 95 ◽  
Author(s):  
B. Neov ◽  
G.P. Vasileva ◽  
G. Radoslavov ◽  
P. Hristov ◽  
D.T.J. Littlewood ◽  
...  
Keyword(s):  
Ribosomal Rna ◽  
18S Rrna ◽  
Phylogenetic Analyses ◽  
The Other ◽  
Rrna Genes ◽  
Host Switching ◽  
28S Rrna ◽  
Mitochondrial Cytochrome ◽  
Rapid Radiation ◽  
18S Rrna Genes

Abstract The aim of the study is to test a hypothesis for the phylogenetic relationships among mammalian hymenolepidid tapeworms, based on partial (D1–D3) nuclear 28S ribosomal RNA (rRNA) genes, by estimating new molecular phylogenies for the group based on partial mitochondrial cytochrome c oxidase I (COI) and nuclear 18S rRNA genes, as well as a combined analysis using all three genes. New sequences of COI and 18S rRNA genes were obtained for Coronacanthus integrus, C. magnihamatus, C. omissus, C. vassilevi, Ditestolepis diaphana, Lineolepis scutigera, Spasskylepis ovaluteri, Staphylocystis tiara, S. furcata, S. uncinata, Vaucherilepis trichophorus and Neoskrjabinolepis sp. The phylogenetic analyses confirmed the major clades identified by Haukisalmi et al. (Zoologica Scripta 39: 631–641, 2010): Ditestolepis clade, Hymenolepis clade, Rodentolepis clade and Arostrilepis clade. While the Ditestolepis clade is associated with soricids, the structure of the other three clades suggests multiple evolutionary events of host switching between shrews and rodents. Two of the present analyses (18S rRNA and COI genes) show that the basal relationships of the four mammalian clades are branching at the same polytomy with several hymenolepidids from birds (both terrestrial and aquatic). This may indicate a rapid radiation of the group, with multiple events of colonizations of mammalian hosts by avian parasites.

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