Journal of the Cameroon academy of sciences最新文献

{"title":"Field management of Taro (Colocasia esculenta (L.) Schott) leaf blight via fungicidal spray of foliage","authors":"T. Mbi, Godswill Ntsomboh-Ntsefong, L. B. Tonfack, E. Youmbi","doi":"10.4314/JCAS.V16I3.2","DOIUrl":"https://doi.org/10.4314/JCAS.V16I3.2","url":null,"abstract":"Taro leaf blight (TLB) epidemic hit Cameroon for the first time in 2009. Since then, the disease is persistent and its typical devastating legacy is threatening Taro (Colocasia esculenta) in the North and South West Regions of Cameroon. This study was initiated with the objective to determine the potentials of some fungicides to control TLB. The experimental design was completely randomized with a 3x15x2 factorial, including 3 treatments: T1 (Callomil plus72WP), T2 (Mancoxyl plus 720WP) and T3, 1:1 ratio T1 + T2 all applied at concentrations of 4g/L; 15 repetitions and 2 planting seasons (dry season i.e. October 2014 – March 2015 and rainy season i.e. April-October 2015). Disease incidence and disease severity were used to evaluate the disease progression while corm yield was used to appraise the economic injury. The results revealed disease incidence of 0% during the dry season and 18.2%, 27.3% and 100%, for T1, T2 and T3 and control during rainy season respectively. Disease severity was 75% in control and only 1% for the different treatments. Corm yield in the rainy season was 17.4kg, 15.08kg, 14.27kg and 5.89kg for T1, T2, T3 and control respectively. This study suggests that TLB epidemic can effectively be managed by foliage spray with Metalaxyl containing fungicides at a weekly dosage of 4g/ L.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124271707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative effects of charred bamboo and its ash on the growth of Entandrophragma angolense (welw.) C dc seedlings","authors":"A. Aderounmu, I. Asinwa, J. O. Omolewa, J. Ishola","doi":"10.4314/JCAS.V16I3.1","DOIUrl":"https://doi.org/10.4314/JCAS.V16I3.1","url":null,"abstract":"Entandrophragma angolense is relatively slow growing species and its growth needs to be enhanced by soil nutrients amendment. Uniformed two weeks old seedlings of E. angolense were transplanted into the polythene pots filled with 2kg of degraded soil and mixed with different levels of biochar and ash produced from bamboo. A 2 x 7 factorial experiment was laid out in Completely Randomized Design (CRD) with four replications to assess the effects of charred bamboo and its ash on the stem girth, leaf area, leaf production and shoot height of E. angolense. The germination data were subjected to descriptive statistics and analysis of variance (ANOVA). There were significant differences (p<0.05) among the treatments in leaf area and shoot height while there were no significant differences (p>0.05) among the treatments in stem girth, leaf production and interactions among levels of biochar and ash. On stem girth, leaf production and shoot height, T6 (15g of bio char + 15g of ash + degraded soil) had the highest mean value of 4.27 mm, 4.59 and 37.55cm respectively while T2 (30g of bio char + 0g of ash + degraded soil) had the highest leaf area (73.31cm2). The biochar and ash from bamboo had significant effects on the growth and development of E. angolense seedlings on degraded soil.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114972130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The utilisation of satellite imagery and community perceptions to assess the impacts of sea encroachment in the West Coast of Cameroon at Limbe","authors":"M. Wantim, Wase Albright Mokosa, Louis Jitiz, S. Ayonghe","doi":"10.4314/JCAS.V16I3.3","DOIUrl":"https://doi.org/10.4314/JCAS.V16I3.3","url":null,"abstract":"Coastal erosion associated to sea encroachment is a major problem at the West Coast of Limbe, specifically in the Debundscha Fishing Port (DFP). This study sought to assess the physical vulnerability of the West Coast of Limbe to coastal erosion associated to sea encroachment. This was achieved by assessing: i) the physical vulnerability of the West Coast to coastal erosion; ii) land cover changes and iii) community perception at DFP to sea encroachment and coastal erosion in the past 30 years. Three variables: rock type, adjacent land use and coastal protection were used to assess the vulnerability of the West Coast to coastal erosion. Landcover / coastal changes were assessed from satellite images from 1986 to 2018. Semi-structural interviews were used to acquire knowledge on the population’s perception and impact of the studied hazards. A cost benefit approach was used to weigh the potentials of these localities to adapt to coastal erosion. The DFP and Idenau Beach were identified as major hotspots of coastal erosion with an annual rate of >100 m2. Landcover changes showed a net increase in water levels inland and into settlements. The population is knowledgeable and is aware of the risk of sea encroachment and coastal erosion. The physical, socio-economic and health effects were: destruction of mangroves; relocation; malaria, typhoid and abdominal illnesses respectively. Coping strategies included the use of sandbags, building on higher grounds and on embankments. Cost benefit analysis ranked vegetative cover as the best option environmentally and financially viable to reduce coastal erosion from sea encroachment at the West Coast.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132018125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wildlife collections of Royal Palace Museums in The West Region of Cameroon with a Focus on wildlife conservation","authors":"Mohamed Mounir Mfonden Poumie, Peter Coals, F. Meutchieye, Olivier Miantsia Fokam","doi":"10.4314/JCAS.V16I3.5","DOIUrl":"https://doi.org/10.4314/JCAS.V16I3.5","url":null,"abstract":"The royal palace museums of the Grassfields’ Kingdoms of West Region of Cameroon are well recognized for the preservation of culturally significant objects and practices. To date, the role of palace museums in wildlife conservation has received little consideration. Herein, a preliminary study into the animalbased artefacts of palace museums from a wildlife conservation perspective is presented. A total of 11 chiefdom palace museums in the West Region of Cameroon were surveyed and the animal species represented in their exhibitions recorded. Parts of 32 different animal species, including locally extinct large mammals such as lion, cheetah, chimpanzee, and elephant were found. The primary purpose for inclusion of specimens in palace museums was for preservation of culture. However, potential wildlife conservation focused uses to which palace museums may also put their collections are discussed herein.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127217561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The thermal dehydroxylation of kaolinite using thermogravimetric analysis and Controlled rate thermal analysis","authors":"J. Mbey, Cyrill Joël Ngally Sabouang, Thomas B. Makon, S. Coulibaly, Sakéo Kong","doi":"10.4314/JCAS.V16I3.4","DOIUrl":"https://doi.org/10.4314/JCAS.V16I3.4","url":null,"abstract":"The aim of this work was to identify parameters that could influence the conversion of kaolinite into metakaolinite. To this end, the dehydroxylation of four kaolinites, using controlled rate thermal analysis (CRTA) and thermogravimetric analysis (TGA), was investigated. X-ray diffraction (XRD) and Fourier transform infra-red (FTIR) were used to confirm the kaolinitic nature of the samples. Their crystallinity was evaluated using the Hinckley index from the XRD patterns and transmission electron microscopy (TEM) was used for morphological observation of the clay platelets. The thermal analyses of the samples indicate, for all samples, low defects as revealed by the low amount of adsorbed water on the clay surface. The dehydroxylation temperature from both techniques was influenced by the sample crystallinity and particle size. It was observed from both techniques that increase crystallinity resulted in high dehydroxylation temperature. Also, the influence of the clay platelets size on the dehydroxylation temperature, is proposed. All the results indicate that crystallinity and particle size are parameters that could be used to control the temperature for the conversion of kaolinite to metakaolinite.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of mineral and organic absorbent during the discoloration of avocado oil by comparing with olive oil","authors":"O. Ngomo, J. Sieliechi, E. Dongo","doi":"10.4314/JCAS.V16I2.4","DOIUrl":"https://doi.org/10.4314/JCAS.V16I2.4","url":null,"abstract":"Avocado is a versatile and valuable product. Its oil is comparable to olive oil in terms of nutritional quality. It can also be used in cosmetics, in particular, in soaps, shampoos and lotions. Despite all these important attributes that avocado has, it is highly perishable and coupled with the lack of farm-to-market roads, a lot of it is lost after harvest during the peak season. The introduction of methods that will transform avocado to products with a long shelf life and added value will go a long way to solving the problem of post-harvest losses and poverty. One of these methods is the production of avocado oil. In addition, in order to reduce the colour of the pigments without altering their quality, discoloration tests were carried out by adsorption on bleaching grounds (a montmorillonite, a kaolinite and activated carbon). The colour intensities of the oils before and after adsorption were determined using two complementary methods: a UV-Vis spectrophotometer and a Konica Minolta spectrophotometer CM-5. The UV-Vis spectrophotometer show that the activated carbon has a best fixing capacity of the pigments; According to the Colorimetric parameters (CIE-Lab) the coordinates L* a* b* that showed brightness (L*) of the avocado oil was half of the olive oil (41.13±0.02 vs 84.85±0.02). The activated carbon was better in fixing the red (a*) (4.99±0.01vs 15.73±0.01 before adsorption) and yellow (b*) (63.71±0.09 vs 70.07±0.09 before adsorption) pigments, while the other two adsorbents have very little influence on the red colour of avocado oil. \u0000ResumeL’avocat est un produit versatile et de grande valeur. Son huile est comparable a huile d’olive en terme de qualite nutritionnelle ; elle peut egalement etre utilisee en cosmetique en occurrence dans les savons, champoings et lotions. En pleine saison, l’on fait face a une abondance des avocats dans les zones de production qui sont tres souvent enclavees ; c’est ainsi que face aux difficultes de transport et les routes peu praticables pour l’importation, l’on se retrouve en train de perdre de tres importantes quantites d’avocats apres les recoltes. Or la production d’huile d’avocats permettrait de reduire les pertes post recolte, reduirait le chomage et permettrait de lutter contre la pauvrete apres la vente des huiles extraites. De plus, dans le but de reduire les pigments colores, des tests de decolorations effectues par adsorption sur des terres decolorantes (une montmorillonite en provenance de Maroua, une kaolinite en provenance de Douala et le charbon actif) sont effectues. Les couleurs des huiles mesurees avant et apres adsorption a l’aide deux appareils complementaires : Le spectrophotometre UV-Vis et du Konica Minolta spectrophotometre CM-5 montrent. Les analyses spectrophotometriques UV-Vis montrent que c’est le charbon active qui presente la meilleure adsorption des pigments ; D’apres les coordonnees L*a*b*, la clarte de l’huile d’avocat est pratiquement la moitie de celle de l’huile d’olive","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134359709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An assessment of the potability of groundwater from boreholes based on microbial quality and physical properties: case of Buea and Tiko Subdivisions, South West Region of Cameroon","authors":"Helen Epouse Azise Ayimele, Melisa Bijingisi, S. Ayonghe","doi":"10.4314/JCAS.V16I2.6","DOIUrl":"https://doi.org/10.4314/JCAS.V16I2.6","url":null,"abstract":"Groundwater from boreholes, though generally considered as potable water, is vulnerable to both microbial pollution and unsuitable physical characteristics. An assessment of the microbial quality and the physical properties of groundwater from boreholes was accordingly carried out in Buea and Tiko subdivisions to determine these parameters. In particular, the presence of coliform bacteria and an eventual isolation of E. coli and Salmonella spp which are faecal indicator organisms were carried out. A total of 46 samples were collected from 29 randomly selected boreholes and their physical parameters (temperature, pH, EC, TDS and turbidity), and microbial content analyzed. Physical parameters were measured in-situ using portable field devices while total coliform count and isolation of faecal coliforms (E. coli and Salmonella spp) were determined using standard microbiological methods with reagents, Violet Red Bile Agar, Mackonkey Agar and Salmonella Shigella Agar respectively. The results indicated that the physical characteristics of the water (pH range 4.9-8.4; EC range 90µS/cm-233µS/cm; TDS range 61 mg/L-1630 mg/L; Turbidity range 0.44NTU-59.80NTU) were within WHO guidelines for potability except for the turbidity with barely two samples that fell within the acceptable range of 1.5NTU. Total coliform counts ranged from 1x100CFU/ml to 3x103CFU/ml and 72.41% of the samples exceeded the WHO recommended 0.0 CFU/100 ml. E. coli was isolated in 76.47 % while Salmonella spp was isolated in 82.35% of the samples. This pioneer study on groundwater quality from boreholes in the study area reveals that the water is vulnerable to bacteriological pollution and therefore not potable. This necessitates awareness creation of the community on the regular disinfection of groundwater from boreholes. \u0000RESUMELes eaux souterraines des forages, bien que generalement considerees comme de l’eau potable, sont vulnerables a la fois a la pollution microbienne et a des caracteristiques physiques inappropriees. Une evaluation de la qualite microbienne et des proprietes physiques des eaux souterraines des forages a donc ete realisee dans les departements de Buea et Tiko pour determiner ces parametres. En particulier, la presence de bacteries coliformes et un eventuel isolement d’E. Coli et l’espece de Salmonella qui sont des organismes indicateurs de contamination fecale ont ete realises. Au total, 46 echantillons ont ete preleves dans 29 forages selectionnes au hasard et leurs parametres physiques (temperature, pH, CE, TDS et turbidite) et leur contenu microbien ont ete analyses. Les parametres physiques ont ete mesures sur place a l’aide d’appareils de terrain portables, tandis que le nombre total de coliformes et l’isolement des coliformes fecaux (E. coli et Salmonella spp) ont ete determines a l’aide de methodes microbiologiques standard avec des reactifs, la gelose violette rouge, la gelose Mackonkey et la gelose Salmonella Shigella respectivement. Les resultats ont ind","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122016777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Défis et enjeux de la gouvernance locale au Cameroun à l’ère de la décentralisation : cas de la ville de Garoua","authors":"Simon Pierre Petnga Nyamen","doi":"10.4314/JCAS.V16I2.7","DOIUrl":"https://doi.org/10.4314/JCAS.V16I2.7","url":null,"abstract":"ResumeLe Decret N°2007/115 du 23 avril 2007 portant creation de nouveaux Arrondissements au sein de certains Departements du Cameroun traduit a priori la volonte du Gouvernement d’insuffler une dynamique nouvelle a son processus de decentralisation. A partir du cas de la ville de Garoua, ce travail traite des defis et enjeux de la gouvernance locale dans un contexte d’acceleration du processus de decentralisation en vue d’un developpement maitrise. Pour ce faire, des echanges avec vingt-six informateurs issus de l’administration publique et privee, douze chefs de quartier et trente des plus anciens habitants de Garoua ont ete mene. En plus, on a eu recours a une centaine d’informateurs et guides, qui ont permis de caracteriser trois cent cinquante-cinq marqueurs spatiaux de la dynamique urbaine de la localite. Les resultats de cette etude revelent que les defis et enjeux actuels de la gouvernance locale sont de trois ordres : reglementaire, financier et fonctionnel. Pour ce qui est du premier ordre, le probleme des villes camerounaises, est le non-respect de la reglementation en vigueur, et surtout l’omnipresence de la corruption. Le deuxieme ordre est celui de l’incapacite des municipalites a collecter les recettes ce qui ne limite leur investissement qu’a des ouvrages de tres faible impact social et economique. Sur le plan fonctionnel, la decentralisation a favorise la multiplication d’acteurs aux aspirations tres souvent divergentes, mais aussi une confusion voire une ignorance des roles. Au terme de cette etude, avec l’adoption de comportements legaux, il est recommande aux administrations locales de s’ouvrir au Systeme d’Information Geographique (SIG) qui dispose des methodes, techniques et outils permettant de gerer efficacement la donnee spatiale et par consequent le territoire. De plus, le processus de creation de ce systeme utilise pour la collecte, le stockage, l’analyse, la modelisation, la gestion, l’affichage et la representation de l’information spatiale, est une excellente aubaine pour la mise en oeuvre d’un cadre de concertation qui integre a differentes echelles, la representativite, les competences et les objectifs respectifs de toutes les parties prenantes a la gouvernance locale. \u0000AbstractDecree N°2007/115 of April 23, 2007 creating new subdivisions within some Divisions of Cameroon demonstrates the will of the Government to improve its decentralization process. Based on the case of the city of Garoua, this work deals with the challenges and issues of local governance, in a context of accelerating the decentralization process with a view to controlled development. To this end, exchanges with twenty-six informants from the public and private administration, twelve chiefdom leaders and thirty of the oldest inhabitants of Garoua were conducted. In addition, about one hundred informants and guides were used, who allowed to characterize three hundred and fifty-five spatial markers of the dynamics of the city. The results revealed t","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125885143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical weathering intensity and rare earth elements release from a chlorite schist profile in a humid tropical area, Bengbis, Southern Cameroon","authors":"V. L. Onana, Estelle Ndome Effoudou, Sylvie Désirée Noa Tang, V. Kabeyene, G. Ekodeck","doi":"10.4314/JCAS.V16I2.5","DOIUrl":"https://doi.org/10.4314/JCAS.V16I2.5","url":null,"abstract":"ResumeUn profil d’alteration developpe sur chloritoschistes de la zone de Bengbis (Sud Cameroun) a ete choisi pour quantifier l’intensite de l’alteration et comprendre le comportement des terres rares. Les valeurs de l’indice d’alteration mafique combinees aux diagrammes ternaires du systeme Al – Fe – Mg – Ca – Na – K montrent que l’hydrolyse des feldspaths est proportionnelle a celle des mineraux mafiques (pertes en Mg), bien que l’hydrolyse des plagioclases (Ca, Na) soit plus intense que celle des mineraux ferromagnesiens. Les materiaux d’alteration etudies sont localises dans le domaine de la kaolinitisation, a l’exception des materiaux nodulaires qui sont legerement latritiss. La modification du comportement du Mg dans le milieu d’alteration s’exprime par les faibles valeurs du rapport Ca/Mg. Le potassium et Be sont lessives dans le sol en association avec Mg. L’ordre de mobilite des elements dans l’environnement d’alteration etudie est : Ca ≈ Na > Fe2+ ≈ Sr > Mg ≈ Co > Mn > Li > Ba > Rb > P > Cd > Ni > Si > Be > K > Sn. Les enrichissements en K, Cs et Be dans les saprolites sont lies a la presence d’illite. L’accumulation en Cs dans le sol est due a la presence de kaolinite. Le systeme le plus stable dans le milieu d’alteration etudie est : Hf – Nb – W – U. Les saprolites, les materiaux nodulaires et les materiaux argileux meubles superficiels sont appauvris en terres rares par rapport a la roche mere. Les terres rares presentent trois types de comportement le long du profil d’alteration, comme l’indiquent les valeurs du rapport (La/Yb)N ((La/Yb)N 1). Les terres rares legeres et les terres rares moyennes s’accumulent dans les materiaux d’alteration pour des valeurs de pH comprises entre 5,5 et 5,6 et pour celles de Eh variant entre +60 et +70mV. L’ordre de mobilite de ces elements dans ces materiaux est le suivant : terres rares moyennes > terres rares lourdes terres rares legeres. Ce fait est contre-intuitif, car les terres lourdes sont plus mobiles dans les environnemenst supergenes que les terres rares legeres. L’adsorption ou la co-precipitation de ces terres rares sur les oxydes de fer peut principalement controler la concentration de ces elements dans le profil d’alteration. Les faibles anomalies en Ce dans les materiaux d’alteration de la zone de Bengbis, dues au changement de Ce3+ en Ce4+, sont probablement dues a la presence de faibles quantites de rhabdophane. Les materiaux d’alteration etudies presentent un fractionnement en Gd (Gd/Gd* ~0.70 – 0.84) dues a une intense lixiviation. Ce fait a rarement ete signale dans un environnement d’alteration lateritique. Il semble qu’une partie de la distribution et de la remobilisation du gadolinium soit controlee par des mineraux mafiques dans les materiaux d’alteration etudies. La distribution et la mobilisation des terres rares sont donc controlees par (1) l’adsorption ou la coprecipitation dans les mineraux mafiques et Fe, (2) et legerement par les mineraux contenant des terres rares tels","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123905163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation de la gestion des déchets solides hospitaliers: cas de l’hôpital Jamôt de Yaoundé et de l’hôpital de district de Biyem-Assi","authors":"Severin Mbog Mbog, Jacob Bidias, Olivier T Sosso Mayi, Dieudonné Bitondo, Innocent Ndoh Mbue","doi":"10.4314/JCAS.V16I2.1","DOIUrl":"https://doi.org/10.4314/JCAS.V16I2.1","url":null,"abstract":"ResumeL’objectif general de cet etude est d’ameliorer la gestion des dechets solides au sein de l’Hopital de district de Biyem-Assi et a l’hopital Jamot de Yaounde. La demarche methodologique menee de juillet 2012 a septembre 2013e adoptee, a consiste a des entretiens et des observations directes et l’administration des questionnaires semi-structures. Cette methodologie a permis de realiser l’etude en trois phases la recherche documentaire, la collecte et le traitement des donnees:Les resultats obtenus font ressortir deux grandes categories de dechets : les dechets assimilables aux ordures menageres (DAOM); les dechets d’activites de soins a risques (DASRI), 24,46 % est assimilable aux (DAOM) et 75,54 % (DASRI) a l’Hopital Jamot de Yaounde. Tandis qu’a l’Hopital de District de Biyem-Assi 86,23 % est assimilable aux (DAOM) et 13,77 % (DASRI). Par contre l’appreciation de l’efficacite du systeme de gestion des dechets solides revele qu’a l’HJY apres des interviews demontre que le systeme est mauvais: tandis qu’a l’HDB, le systeme est plus pris en charge par le personnel. Au vu des observations et constats faites, une amelioration du systeme de gestion des dechets solides et l’accroissement de la sensibilisation du personnel et des usagers sur les modes de gestion des dechets solides s’imposent. \u0000AbstractThe general objective of this study is to improve the management of the solid waste within Biyem-AssiDistrict Hospital and the Jamot Hospital , Yaounde.The work was carried out from July 2012 to September 2013,and consisted to interviews and the direct observations and the administration of semi-structured questionnaires. This methodology permitted us to achieve the survey in three phases: the documentary research, the collection and the treatment of the data:The results obtained revealed two big categories of garbage taken out again: the garbage assimilated to the household waste (HhW); hospital waste (HoW). About 24, 46 % was assimilated to (HhW) and 75, 54 % (HoW) in the Yaounde Jamot Hospital. While to the hospital of District of Biyem-Assi 86, 23 % is assimilated to them (HhW) and 13, 77% (DHoW). On the other hand the appreciation of the efficiency of the system of management of the solid waste reveals that to the HJY after interviews demonstrates that the system is bad: while to the HDB, the system is taken more in charge by the staff. Within sight of the observations and reports made, an improvement of the system of management of the strong garbage and the growth of the sensitization of the staff and users on the fashions of management of the strong garbage impose themselves.","PeriodicalId":383706,"journal":{"name":"Journal of the Cameroon academy of sciences","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128730537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}