Impact des effluents d'un complexe agro-industriel sucrier sur la distribution des mollusques dulçaquicoles à Mbandjock (Cameroun)

Des prospections malacologiques ont été entreprises dans la zone sucrière de Mbandjock (Cameroun). La distribution des mollusques est discutée suivant les types d'habitat. L'incidence des effluents du complexe agroindustriel (Sosucam) sur la faune malacologique est évaluée. En général, un faible degré de pollution est favorable à la faune malacologique alors qu'une forte pollution lui est nuisible. La présence de #Bulinus #globosus est mise en évidence. Ce mollusque, hôte intermédiaire de #Schistosoma #haematobium était absent lors des prospections antérieures. L'extension de #Bulinus #globosus dans la localité devrait faire l'objet d'une surveillance à long terme. (Résumé d'auteur

Impact des effluents d'un complexe agro-industriel sucrier sur la distribution des mollusques dulçaquicoles à Mbandjock (Cameroun)

Des prospections malacologiques ont été entreprises dans la zone sucrière de Mbandjock (Cameroun). La distribution des mollusques est discutée suivant les types d'habitat. L'incidence des effluents du complexe agroindustriel (Sosucam) sur la faune malacologique est évaluée. En général, un faible degré de pollution est favorable à la faune malacologique alors qu'une forte pollution lui est nuisible. La présence de #Bulinus #globosus est mise en évidence. Ce mollusque, hôte intermédiaire de #Schistosoma #haematobium était absent lors des prospections antérieures. L'extension de #Bulinus #globosus dans la localité devrait faire l'objet d'une surveillance à long terme. (Résumé d'auteur

Toxicity Assessment of Atrazine and Related Triazine Compounds in the Microtox Assay, and Computational Modeling for Their Structure-Activity Relationship

The triazines are a group of chemically similar herbicides including atrazine, cyanazine, and propazine, primarily used to control broadleaf weeds. About 64 to 80 million lbs of atrazine alone are used each year in the United States, making it one of the two most widely used pesticides in the country. All triazines are somewhat persistent in water and mobile in soil. They are among the most frequently detected pesticides in groundwater. They are considered as possible human carcinogens (Group C) based on an increase in mammary gland tumors in female laboratory animals. In this research, we performed the Microtox Assay to investigate the acute toxicity of a significant number of triazines including atrazine, atraton, ametryne, bladex, prometryne, and propazine, and some of their degradation products including atrazine desethyl, atrazine deisopropyl, and didealkyled triazine. Tests were carried out as described by Azur Environmental [1]. The procedure measured the relative acute toxicity of triazines, producing data for the calculation of triazine concentrations effecting 50% reduction in bioluminescence (EC50s). Quantitative structure-activity relationships (QSAR) were examined based on the molecular properties obtained from quantum mechanical predictions performed for each compound. Toxicity tests yielded EC50 values of 39.87, 273.20, 226.80, 36.96, 81.86, 82.68, 12.74, 11.80, and 78.50 mg/L for atrazine, propazine, prometryne, atraton, atrazine desethyl, atrazine deisopropyl, didealkylated triazine, ametryne, and bladex, respectively; indicating that ametryne was the most toxic chemical while propazine was the least toxic. QSAR evaluation resulted in a coefficient of determination (r2) of 0.86, indicating a good value of toxicity prediction based on the chemical structures/properties of tested triazines

Toxicity Assessment of Atrazine and Related Triazine Compounds in the Microtox Assay, and Computational Modeling for Their Structure-Activity Relationship

The triazines are a group of chemically similar herbicides including atrazine, cyanazine, and propazine, primarily used to control broadleaf weeds. About 64 to 80 million lbs of atrazine alone are used each year in the United States, making it one of the two most widely used pesticides in the country. All triazines are somewhat persistent in water and mobile in soil. They are among the most frequently detected pesticides in groundwater. They are considered as possible human carcinogens (Group C) based on an increase in mammary gland tumors in female laboratory animals. In this research, we performed the Microtox Assay to investigate the acute toxicity of a significant number of triazines including atrazine, atraton, ametryne, bladex, prometryne, and propazine, and some of their degradation products including atrazine desethyl, atrazine deisopropyl, and didealkyled triazine. Tests were carried out as described by Azur Environmental [1]. The procedure measured the relative acute toxicity of triazines, producing data for the calculation of triazine concentrations effecting 50% reduction in bioluminescence (EC50s). Quantitative structure-activity relationships (QSAR) were examined based on the molecular properties obtained from quantum mechanical predictions performed for each compound. Toxicity tests yielded EC50 values of 39.87, 273.20, 226.80, 36.96, 81.86, 82.68, 12.74, 11.80, and 78.50 mg/L for atrazine, propazine, prometryne, atraton, atrazine desethyl, atrazine deisopropyl, didealkylated triazine, ametryne, and bladex, respectively; indicating that ametryne was the most toxic chemical while propazine was the least toxic. QSAR evaluation resulted in a coefficient of determination (r2) of 0.86, indicating a good value of toxicity prediction based on the chemical structures/properties of tested triazines