Lake M'bakré, on the West African coast, south of Abidjan, is facing the consequences of eutrophication and recent developments in its surroundings. To assess the physico-chemical quality of its waters, the monitoring of physico-chemical parameters was carried out between June 2013 and March 2014. The results of the analyses show that its waters are neutral to alkaline, well oxygenated, not very mineralised, warm all year round, benefit from a good water quality and are little affected by the poor development of its surroundings. The lake's waters are not affected by the nutrient salts measured and these parameters remain below international standards.

The aim of this study was to investigate whether and how teachers’ perceptions of social-emotional climate in their schools influenced the outcome variables – teachers’ professional commitment – and to examine the pathways of this relationships with satisfaction at work as mediator variable. The sample included 265 secondary school teachers from Yaoundé, Cameroon. Participants completed a questionnaire about the teacher’s commitment, perceived school climate, and satisfaction at work. A mediation analysis was used to examine a mediatory model of the variables. Satisfaction at work mediated the relationship between school organizational climate and teachers’ professional commitment. School organizational climate was considered as the determinant for teachers’ professional commitment, with satisfaction at work playing a key role. In conclusion, the result findings of this study can contribute to all types of schools and school administrators. This is because by understanding school climate influence, school administrators and teachers will be able to work towards fostering education excellence at present and for the future.

With the resulting one from analysis of the data of this study whose objective is to make an inventory of fixtures of the management of solid waste of care of health at the general hospital of reference of Wangata for an evaluation of the effectiveness of the whole of the system finally making it possible to estimate if the construction of the furnace with incineration entered within the framework of a management systemic and planned for a solution total and durable, it arises however that the system of management is not effective, and that the construction of the furnace with incineration was only one emergency intervention with an only aim of eliminating the wild discharges and the unpleasant odors. There is not a plan of management, nor program, less still a clear policy as regards management of waste in this hospital. 96,7% of personnel are not formed, not sorted waste, not of budget allocated with the management of waste.