1. University Institute of Technology, University of Douala, Douala, Cameroon
2. Department of Microbiology, University of Yaoundé I, Yaoundé, Cameroon
3. Department of Food and Chemical Engineering, Vasile Alecsandri University of Bacau, Bacau, Romania
4. University of Bucharest, Faculty of Psychology and Educational Sciences, Bucharest, Romania
5. Department of Mechanical and Environmental Engineering, Vasile Alecsandri University of Bacau, Bacau, Romania
6. Department of Biology, Ecology and Environment Protection, Vasile Alecsandri University of Bacau, Bacau, Romania