Biodiversité végétale et vitesse de la régénération de la forêt classée de Sanaimbo (Côte d’Ivoire)

Nous analysons l’impact de l’agriculture traditionnelle sur la diversité végétale dans une forêt semi-décidue afrotropicale non soumise à des perturbations naturelles majeures. Les assemblages d’espèces et les attributs structurels de la diversité sont décrits le long d’une chronoséquence sur 30 ans de champs abandonnés, comparativement aux communautés de forêts « primaires » et de forêts coupées sélectivement. Seulement 6,3% des espèces inventoriées dans les forêts anciennes n’ont pas été observées dans les jachères, alors que 12,3% des espèces sont propres aux jachères. Lorsque la forêt ancienne sur sol ferrallitique est prise comme référence, les analyses de régression linéaire montrent que cette forêt peut recouvrer la structure et la fonction au cours de la quatrième décennie de recolonisation, et la composition spécifique une décennie plus tard. L’invasion précoce des champs par Chromolaena odorata (L.) R. King & H. Robinson. ne semble pas altérer durablement la succession secondaire. Les espèces s’assemblent en communautés végétales discrètes le long du gradient successionnel, en fonction de leurs exigences en lumière, suggérant une partition des niches écologiques.Mots clés : Biodiversité végétale, successions secondaires, indices de diversit

The effects and toxicity of cathinones from the users' perspectives: A qualitative study.

OBJECTIVE: The objective of this study is to explore the users' perspectives regarding the effects and toxicity of cathinones. METHODS: A systematic search of Internet discussion forums yielded 303 threads relevant to the research objectives. The threads were analysed by conventional content analysis where concepts were developed from codes and themes. RESULTS: The study identified 3 main themes in relation to cathinone use, effects, and toxicity. The first theme considered the modalities of intake of cathinones in relation to the derivative taken (mainly mephedrone, 3-methylmethcathinone, and methylenedioxypyrovalerone), route of administration (eyeballing, insufflation, smoking, intravenous, oral, rectal, and sublingual), multidrug use, and purity of the cathinone derivative. The second theme characterised the main effects of cathinones, that is, increased energy, euphoria, and empathogenic. Toxic effects were reported regarding the nervous system (anxiety, hallucinations, nervousness, and paranoia), cardiovascular system (angina, myocardial infarction, and tachycardia), skin (discolouration, itching, and allergy), and renal system (difficulty in urination). Drug-drug interactions were also reported including multiple drug use between cathinones, stimulants, depressants, and hallucinogens. CONCLUSIONS: The Internet discussion forums provide useful sources of information regarding the effects and toxicity of cathinones, which can be taken into account when assessing the safety of drugs

WQ assessment of water treatment plants using environmental and statistical indicators within Baghdad City

The primary task that is facing most developing countries is the untreated disposal of wastewater into the water bodies. In order to meet the water needs of future generations, the integrated water resources should be managed within a sustainable method. This study illustrates the assessment and judgment of the suitability of Tigris River for drinking purposes using water quality index (WQI) and the selection of the mostly significant water quality WQ parameters that affect Tigris River deterioration using Artificial Neural Network (ANN). Along with Baghdad city, nine stations of Tigris River were assessed for fourteen physicochemical parameters. Results, Tigris River, was classified (poor – polluted) according to the Weighted arithmetic WQI (WA-WQI) with turbidity and Total dissolved solids (TDS) are the most parameter affecting on the WQ

Photocatalytic degradation efficiency of azo dye in aqueous phase using different photo catalysts

The new azo dye [4-(4-hydroxy-2-methylnaphthyl)diazenyl]benzoic acid was synthesized by the reaction of 2-methyl-1-naphthol with p-amino benzoic acid. The photcatalytic degradation of azo dye has been investigated by using zinc oxide and cadmium sulfide. This degradation was carried out by the irradiation of aqueous suspended solutions containing different concentrations of this dye using 0.11 g/100 mL of metal oxide (semiconductors) ZnO and CdS. A mercury lamp 125 W in a Pyrex photoreaction cell of 100 mL at room temperature was used as an irradiation source. The effect of the catalyst on the photocatalytic degradation of the prepared dye was studied via several experiments at different conditions, where they involve the effect of the catalyst mass and the effect of the dye concentrations. The irradiated solutions were studied using UV-Vis spectrophotometer. It has been the performance of photocatalytic system that using ZnO was observed to be better than cadmium sulfide system for degrade the azo compound from its aqueous solution.                     KEY WORDS: Photocatalytic, Degradation, Semiconductors, Zinc oxide; Cadmium sulphide, Azo dye   Bull. Chem. Soc. Ethiop. 2020, 34(3), 463-469. DOI: https://dx.doi.org/10.4314/bcse.v34i3.