The study on the characteristics of growth and condition factor K of Clarias jaensis was made in the floodplain of Mbô in Cameroon according to site, season, sex and size class. To assess the structure and dynamics of the population of C. Jaensis, in order to reduce mismanagement of fishing, 230 fish caught by "hawk" type gill nets, hooks and baited traps were collected monthly in three sites (Menoua, Nkam and flooded ponds) among fishermen between November 2016 and September 2017. The measurements and weighings of the total and standard lengths, then the total weight and eviscerated weight of the specimens ranged from 12.00 to 52.00 cm and 10.50 to 47, 50 cm respectively; Between 9.99 to 1165.59 g and 8.65 to 1119, 80 g. Overall, this species has a positive allometry growth. However, it showed seasonal variations. Thus, in the dry season, it passes from positive allometry to negative allometry regardless of sex and state of maturity, then isometry growth in the Nkam River to allometry positive in Menoua and flooded ponds. Condition factor K varied between 1.05 and 1.17 regardless of the factor considered. However no significant differences were observed. In view of these results, C. Jaensis could be considered as potential candidate for aquaculture

This work presents the results of palynological analysis of the Albo-Cenomanian interval of two wells located on the Abidjan margin in the offshore sedimentary basin of Côte d'Ivoire. It aims to reconstruct deposition environments during this interval coinciding with the oceanic anoxic event (EAO1) recorded in the Atlantic. After classical chemical attacks with strong acids, the palynomorphs extracted from 114 cuttings samples were identified and counted. The results show that out of 9786 registered palynomorphs 5108 belong to the Y-3M well and 4678 to the Y-4M well. Quantitative analysis of spore groups, pollen grains (Classopollis, Ephedripites, Araucariacites), elateres and dinocysts revealed a predominantly continental (littoro-deltaic) depositional environment with marine incursions. This sedimentation occurred under a predominantly arid to semi-arid palaeoclimate under relatively humid conditions in some places. These palynological quantitative approaches will help to refine the deposit environment of the Albian in Ivory Coast.

Cyanobacteria Arthrospira platensis var Toliarensis is a food source with high nutritional qualities due to the diversity and richness of its constituents. However, its production in a synthetic medium is very expensive given the high requirements in mineral elements of this micro-algae. The present study conducted at the Spirulina Production Pilot Unit of the Institute of Fisheries and aquatic Sciences of the University of Douala at Yabassi aimed to evaluate the effect of the different doses Manihot esculenta Crantz (Casava) and Laportea aestuans leaves extracts on biomass production and nutritional characteristics of postharvest dry biomass of Arthrospira platensis. To achieve this objective, 11 experimental culture substrates were developed, 10 of which were based on extract of Manihot esculenta leaves at different doses (10 g / l, 20 g / l, 30 g / l, 40 g / l, 50 g / l) and based on extract of Laportea aestuans doses (at the same doses are respectively 10 g / l, 20 g / l, 30 g / l, 40 g / l, 50 g / l) and 1 referential medium ( Modified Jourdan medium). ). All the media previously prepared were subsequently seeded with 5 ml / l of a strain of Arthrospira platensis for each respective medium. A daily check of the physicochemical parameters was carried out, as well as weekly harvests in order to evaluate the productivity of each culture medium. A characterization of nutritional parameters (quantification of proteins, carbohydrates, lipids, phycocyanin and moisture) of post harvest biomasses from different media was made later. A comparative analysis of dry biomass obtained from different experimental culture media based on Manihot esculenta leaf extract at different doses (10 g / l, 20 g / l, 30 g / l, 40 g / l, 50 g / l l) and those with the extract of Laportea aestuans doses (respectively at doses of 10 g / l, 20 g / l, 30 g / l, 40 g / l, 50 g / l) compared to the reference medium of Jourdan shows a significant difference (P˂ 0.05) between treatments. The culture medium at a dose of 50 g / l of Laportea aestuans (M11) had a significantly greater effect on biomass production than all other experimental media with an average biomass of 5.65 ± 0.32 g / l. These results are also reflected in the better nutritional profile of post-harvest biomass from this environment, particularly their protein content (an average of 55.44 ± 0.38%) and carbohydrate (an average value of 33.93 ± 5.45%) in lipid (9.97 ± 1.11) in moisture (16.30 ± 4.66%) but also in phycocyanin (11.66 ± 2.97%) compared to other experimental media.

The National Science and Technology Museum creates an “Online to Onsite visitor behavior system”(OOVBS) into ”Explore IoT Exhibition”. The system is installed in all interactive units, through app, beacon technology and program for capturing personal experience during a museum visit. Besides, we adopted Stephen Bitgood’s behavior observation scale: the degree of involvement, the state of operations, the degree of reading, and the content of discussion into this interactive unit as criteria for evaluation. We will be able to retrieve visitors’ data that included basic information, comments and feedback, as well as comprehensive performance of visitor behavior via this system, by starting and operating interactive units with the corresponding identifiers of the applications demonstrated at the exhibition that they download. This article presents an “online to onsite” exhibition mode of intelligent museum to access learning behavior of visitors and build data analysis.Through the actual implementation of a visitor database for the exhibition, audiences’ visiting behavior and learning mode can be documented and evaluated. If the concept of a ‘museum group’ system can be developed in the future to integrate all museum audiences’ information, it will have an impact on the museum’s exhibitions, education, and operations.

Cette observation mise à la portée des lecteurs, émane d’une observation faite dans les lieux ou s’exploitent artisanalement les minerais du cuivre au Lualaba et dont la motivation majeure n’est autre que de montrer comment se crée des nouveaux territoires socio-économiques. Cette étude a été menée dans la province du Lualaba principalement dans les territoires de Mutshatsha, Lubudi et Kolwezi. Ainsi, les autorités locales et provinciales devraient considérer ces territoires socio-économiques comme sources des gains pour organiser une structure du marché selon le modèle et organiser la cohabitation des anciens occupants avec les nouveaux (ceux qui sont venu des autres contrées et cités d’autres province) pour l’exploitation du cuivre dans ces territoires. A ce jour, plusieurs territoires sont nés (non encore encadré) et pas connu de l’administration Territoriales.