van der Maesen J.,Wageningen University |
Walters G.M.,Missouri Botanical Garden |
Walters G.M.,University College London |
Walters G.M.,Institute Of Pharmacopee Et Of Medecine Traditionnelle
Plant Ecology and Evolution | Year: 2011
Background - On-going botanical research in Gabon continues to yield species new to science, in this case a new member of the leguminous genus Eriosema. Material and methods - Normal practices of herbarium taxonomy have been applied; material is present in LBV, MO, and WAG. Key results - A new species, Eriosema batekense Maesen & G.M.Walters, is described and illustrated. The stems of the new species are not as thin as in E. youngii. The tubers are narrow-spindly and straight, vertical in the soil, not napiform as in E. youngii. Another similar species, E. linifolium, is more robust with thicker stems and rootstock. E. batekense occurs on the Batéké Plateaux in Gabon, and has also been collected from the nearby Bafuru Plateau in Congo-Brazzaville. It is restricted to Kalahari sands. The species is assessed to be of Least Concern according to the IUCN criteria. © 2011 National Botanic Garden of Belgium and Royal Botanical Society of Belgium.
Anthony N.M.,University of New Orleans |
Mickala P.,Universite des Sciences et Techniques de Masuku |
Abernethy K.A.,University of Stirling |
Atteke C.,Universite des Sciences et Techniques de Masuku |
And 31 more authors.
Conservation Genetics Resources | Year: 2012
A five-day international workshop was recently convened at the Université des Sciences et Techniques de Masuku in Gabon to enhance international collaboration among Central African, US and European scientists, conservation professionals and policy makers. The overall aims of the workshop were to: (1) discuss emerging priorities in biodiversity and conservation genetics research across Central Africa, and (2) create new networking opportunities among workshop participants. Here we provide a brief overview of the meeting, outline the major recommendations that emerged from it, and provide information on new networking opportunities through the meeting web site. © 2011 Springer Science+Business Media B.V.
Walters G.,Institute Of Pharmacopee Et Of Medecine Traditionnelle |
Ngagnia Ndjabounda E.,Universite des Sciences et Techniques de Masuku |
Ikabanga D.,Universite des Sciences et Techniques de Masuku |
Biteau J.P.,Jardi Gab |
And 8 more authors.
ORYX | Year: 2015
Urban development is an increasing threat to the integrity of formerly remote protected areas, in some cases resulting in their downgrading, downsizing or degazetting. One-quarter of previously remote protected areas are now within 17 km of a city and thus face the threat of urbanization. Here we describe a case of avoided downgrading, downsizing and degazetting of a protected area in the Mondah forest of Gabon, north of Libreville. Since its creation in 1934 the Forêt Classée de la Mondah has been downsized regularly, losing 40% of its area over 80 years. During this time the forest surrounding the Forêt Classée was subject to usage for urban and peri-urban needs, including agriculture, sand extraction, collection of medicinal plants, ceremonies, and housing construction. In 2010 the area was threatened with further downsizing. The presence of narrowly endemic plant species in the area was suspected, and mapping and evaluation of these species was proposed in an effort to maintain the protected area boundaries. Botanical field work, including ex situ conservation measures and participant observation in nearby forest communities, was conducted; 24 endemic species, all threatened by urbanization, were evaluated using the criteria for the IUCN Red List of Threatened Species. The borders of the protected area were maintained because of its role in maintaining irreplaceable habitat for threatened species. The area was renamed Raponda Walker Arboretum in 2012. Copyright © Fauna & Flora International 2015
Aworet-Samseny R.R.R.,Institute Of Pharmacopee Et Of Medecine Traditionnelle |
Souza A.,Institute Of Pharmacopee Et Of Medecine Traditionnelle |
Kpahe F.,University Of Cocody |
Konate K.,University of Ouagadougou |
Datte J.Y.,University Of Cocody
BMC Complementary and Alternative Medicine | Year: 2011
Background: Dichrostachys cinerea (L.) Wight et Arn. (Mimosaceae) is largely used in ethno-medically across Africa, and mainly employed for the treatment of asthma in Ivory Coast and Gabon. The paper analyses the relaxation induced by the methanolic extract of D. cinerea (Edici) in the guinea-pig trachea preparations (GPTPs). Purpose: This study aimed to bring out the scientific basis to the use of this plant leading to the validation of this phytomedicine.Method: The aorta obtained from guinea-pigs was immediately placed in a Mac Ewen solution. Experiments were performed in preparations suspended between two L-shaped stainless steel hooks in a 10 ml organ bath containing Mac Ewen solution. The isometric contractile force of the aorta strips of guinea-pig were recorded by using a strain gauge. The different drugs were directly administered into the organ bath and the magnitude of GPTPs was evaluated.Results: Phytochemical analysis of the methanolic extract of Dichrostachys cinerea (Edici) using chemical methods revealed the presence of flavenoids, tannins, sterols, triterpenes and polyphenols. Pharmacological studies performed in GPTPs show that of Dichrostachys cinerea (0.1 mg/ml - 2 mg/ml) evoked a broncho-constriction in GPTPs. Whereas, at concentration up to 2 mg/ml, Edici induced a significant dose-dependent relaxation in the GPTPs. KCl-, ACh- or histamine-evoked contractions of isolated trachea was significantly inhibited by increasing concentrations of Edici (3.5-10 mg/ml). Edici (10 mg/ml) as well as promethazine (0.25 mg/ml) significantly inhibited contractions induced by increasing concentrations of histamine (1×10-7-1×10-4mg/ml). In the presence of atropine at a concentration of 10-6mg/ml, contractile response curve (CRC) evoked by ACh (1×10-5-1×10-2mg/ml) was significantly abolished in concentration-dependent manner. Edici did not significantly reduced ACh evoked contraction (10-5-10-2mg/ml).Conclusion: These observations suggest that Edici could act through two mechanisms: firstly by activation of β-adrenergic or histaminergic receptors; and secondly muscarinic receptors may not be greatly involved, that justifying the use of the extract in traditional Medicine in Africa. © 2011 Aworet-Samseny et al; licensee BioMed Central Ltd.