Journal articles on the topic 'T – Cameroon'
To see the other types of publications on this topic, follow the link: T – Cameroon.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'T – Cameroon.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Bordoni, Arnaldo. "New data on the Afrotropical Xantholinini (Coleoptera, Staphylinidae). New genus and new species of Uganda, Tanzania, Cameroon, and Gabon." Fragmenta Faunistica 64, no. 1 (May 24, 2022): 1–11. http://dx.doi.org/10.3161/00159301ff2021.64.1.001.
Full textAbstract:
Kalinzulinus gen. nov. and Kalinzulinus minutus sp. nov. from Uganda are described and illustrated. The following new species are also described and illustrated: Thyreocephalus tanzanicus sp. nov. related to T. mocquerysi (Fauvel, 1903), Agaporina tanzanica sp. nov. fromTanzania, Chaetocinus gabonicus sp. nov. from Gabon, related to C. asymetricus Bordoni, 2016 from Gabon, and Chaetocinus jokoensis sp. nov. from Cameroon, related to C. persalsus Bordoni, 2016 from Cameroon and Congo. The male of Nudobius quadriceps Cameron, 1929 is described and figured for the first time.
2
Dinissia, Jérémie, Lucien Tatchum Tcheunteu, Abba Maimouna, Hawaou, Habib Alium, Dieudonné Nwaga, and Clautide Megueni. "Diagnostique de production de l’oignon dans la partie Septentrionale du Cameroun." International Journal of Biological and Chemical Sciences 15, no. 3 (September 7, 2021): 923–35. http://dx.doi.org/10.4314/ijbcs.v15i3.7.
Full textAbstract:
Oignon (Allium cepa L.) est une culture maraîchère présentant un atout économique important pour les paysans Camerounais. Cette étude visait à faire un diagnostic de production de l’oignon dans la partie Septentrionale du Cameroun afin de développer des stratégies d’amélioration durable de cette filière. Une enquête a été menée pour déterminer le profil des acteurs de la filière oignon, les variétés cultivées, les techniques culturales ainsi que les contraintes de production. Les enquêtes s’étaient déroulées en 2017 auprès des acteurs de la filière oignon. L’échantillonnage était constitué de 60 personnes dans chacune des trois régions du Grand Nord Cameroun, soit un échantillonnage global de 180 personnes. Les résultats montrent que la plupart des acteurs sont des producteurs et sont 1,47 fois plus nombreux que les commerçants. 04 variétés d’oignon sont cultivées : Goudami, Chagari, Belami et violet de Galmi. La variété Goudami avait un rendement en bulbe élevé (10 à 35 t/ha), une durée de conservation des bulbes plus importante et est la plus cultivée. La quasi-totalité (69%) des producteurs utilise les engrais chimiques pour améliorer le rendement de cette culture. Ces informations serviront de base de données dans le programme de perfectionnement de la filière oignon au Cameroun.
English title: Diagnosis of onion production in the Northern Part of Cameroon
Onion (Allium cepa L.) is a market garden crop that is a major economic asset for Cameroonian farmers. This study aimed at diagnosing onion production in the Northern part of Cameroon in order to develop strategies for onion sustainable improvement. A survey was conducted to determine the actors profile relative to onion sector, varieties grown, crop techniques as well as production constraints. The surveys were conducted in 2017 among actors of onion sector. The sample consisted of 60 people in each of the three regions of Far North Cameroon, for an overall sample of 180 people. The results shown that most of the actors are producers, they are 1.47 folds greater than traders. Four onion varieties are grown in the Northern part of Cameroon: Goudami, Chagari, Belami and Galmi violet. The Goudami variety presents high bulb yield (10 to 35 t/ha) and longer bulb shelf life, and is the most widely cultivated. Almost all (69%) of the producers use chemical fertilizers to improve onion growth. This information will be used as a database to improve the performance of onion sector in Cameroon.
3
Mewounko, Augustin, Roger Darman Djoulde, Alain Christian Misse, Oumarou Yakouba, Simon Djakba Basga, Philémon Kaouvon, and Charles Amele Njoumoui. "Contraintes de production du riz pluvial dans la Région de l’Est – Cameroun." Cameroon Journal of Experimental Biology 16, no. 1 (January 26, 2023): 53–60. http://dx.doi.org/10.4314/cajeb.v16i1.7.
Full textAbstract:
Le riz est une céréale cultivée et consommée partout en Afrique. Au Cameroun, il est cultivé en système irrigué, pluvial et bas fond. Sa production par an estimée à 360 000 t, est très inférieure à la demande estimée à environ 800 000 t de paddy. L’Est – Cameroun présente des riches potentialités favorables à la riziculture pluviale, qui reste cependant faiblement pratiquée. Pour cette étude, l’objectif est d’identifier les causes qui freinent la pratique de la riziculture dans cette région potentiellement favorable. Des bassins de productions du riz ont été identifiés par la Délégation Régionale de l’Agriculture et de Développement Rural de l’Est (DRADERE) et la Station Polyvalente de Recherche Agricole de Bertoua (SPRAB) dans les départements de la Kadey, de Lom et Djerem et du Haut Nyong. Ainsi 200 producteurs ont été enquêtés dans 25 villages afin d’identifier les facteurs qui limitent la pratique de la riziculture dans cette région. Il ressort que le rendement moyen régional est de 1,7 t/ha, alors qu’ils sont de 2,2 t/ha dans la Kadey, 1,6 t/ha dans le Lom et Djerem et de 1,2 t/ha dans le Haut Nyong. Les contraintes telles que la baisse de fertilité des sols, les oiseaux ravageurs, la qualité de semence, le traitement post - récolte (TPR), la non maitrise de l’itinéraire technique (ITK), les maladies, les insectes ravageurs, le stress hydrique et la destruction par les hérissons ont été révélées dans tous les trois départements. Cependant, la baisse de fertilité des sols, les oiseaux ravageurs et le traitement post - récolte sont identifiées comme contraintes principales alors que la destruction des hérissons et le déficit hydrique sont des contraintes mineures. Pour réussir la riziculture à l’Est-Cameroun, il faudrait tenir compte de toutes ces contraintes de production qui peuvent compromettre le rendement.
Abstract
Rice is a cereal grown and consumed everywhere in Africa. In Cameroon, it is grown in irrigated, rainy and lowland system. Its production per year estimated at 360 000 t is much inferior to the estimated demand for about 800,000t of paddy. East - Cameroon has rich potential favorable to upland rice cultivation, which is however weakly practiced. For this study, the objective is to identify the causes that hinder the practice of rice growing in this potentially favorable region. Rice production pools have been identified by the Regional Delegation of Agriculture and Rural Development of Bertoua (RDARDB) and Bertoua Polyvalent Agricultural Research Station (BPARS) in the Kadey division, Lom and Djerem division and Haut Nyong division. Thus 200 producers have been administered questionnaire in 25 villages to identify the factors that limit the practice of rice growing in this region. This study shows that the regional means is 1,7 t/ha, meanwhile in the Kadey Division we have 2,2 t/ha, in the LOM and Djerem Division we have 1,6 t/ha and 1,2 t/ha in Haut Nyong Division. Several constraints have been revealed in the tree divisions, such as: low soil fertility, bird’s damages, seed quality, post-harvest treatment, no mastery of farming technique, diseases, pests, water stress, and hedgehog destruction. However, low soil fertility, bird’s damages and the post - harvest treatment (PHT) are primarily identified, whereas hedgehog destruction and water stress are minor. To succeed rice cultivation in East - Cameroon, it is better to be aware of constraints which could lower the yield.
4
Mana, Djibrilla, Souare Konsala, and Ibrahima Adamou. "Diversité et importance socio-économique des Loranthaceae parasites des plantes ligneuses des Monts Mandara dans la Région de l’Extrême-Nord, Cameroun." International Journal of Biological and Chemical Sciences 15, no. 2 (June 22, 2021): 578–93. http://dx.doi.org/10.4314/ijbcs.v15i2.16.
Full textAbstract:
Les Loranthaceae constituent des ressources précieuses pour les populations locales africaines. Cependant, peu d’ethnies connaissent l’importance socio-économique des Loranthaceae de par le manque d’études ethnobotaniques sur ces espèces. Afin de contribuer à la valorisation et à la gestion durable des Loranthaceae parasites des plantes ligneuses, une approche associant deux méthodes a été adoptée. L’une, basée sur des relevés de surface et l’autre sur une enquête ethnobotanique relative aux connaissances locales des Loranthaceae dans 9 Arrondissements de la Région de l’Extrême-Nord du Cameroun. Au total, 4 genres (Agelanthus, Globimetula, Phragmanthera et Tapinanthus) et 7 espèces parasites (Agelanthus dodoneifolius, Globimetula braunii, Phragmanthera capitata, Tapinanthus bangwensis, T. belvisii, T. globiferus et T. ophiodes) ont été inventoriés et identifiés dans les Monts Mandara. Il ressort aussi que ces espèces parasites sont utilisées en pharmacopée dans des recettes médicinales et magico-religieuses (45,56%), pour traiter des infertilités (32,70%) et des troubles mentaux (32,36%). Les résultats ont aussi montré que Mangifera indica (35,74%) et Senna singueana (34,41%) sont les hôtes des parasites les plus sollicités. Aussi ont-ils révélé que la commercialisation des Loranthaceae constitue une source de revenu économique et une ressource importante en pharmacopée pour les populations locales des Monts Mandara. Ces résultats pourraient servir de référence pour la recherche de stratégies d’exploitation et de conservation durable de cette diversité végétale.Mots clés : Loranthaceae, Espèces parasites, pharmacopée, Monts Mandara, Cameroun.
English Title: Diversity and socio-economic importance of Loranthaceae parasites of woody plants of Mandara Mountains in the Far-North Region, Cameroon
Loranthaceae are valuable resources for local African populations. However, few ethnic groups know the socio-economic importance of Loranthaceae due to the lack of ethnobotanical studies on these species. In order to contribute to the enhancement and sustainable management of Loranthaceae parasites of woody plants, an approach combining two methods was adopted. One, based on surface surveys and the other on an ethnobotanical survey relating to local knowledge of Loranthaceae in 9 Subdivisions of the Far North Region of Cameroon. In total, 4 genera (Agelanthus, Globimetula, Phragmanthera and Tapinanthus) and 7 parasitic species (Agelanthus dodoneifolius, Globimetula braunii, Phragmanthera capitata, Tapinanthus bangwensis, T. belvisii, T. globiferus and T. ophiodes) have been inventoried on the Mandara Mountains. It also appears that these parasitic species are used in pharmacopoeia in medicinal and magico-religious recipes (45.56%), to treat infertility (32.70%) and mental disorders (32.36%). The results also showed that Mangifera indica (35.74%) and Senna singueana (34.41%) are the hosts of most solicited parasites. They also revealed that the commercialisation of Loranthaceae constitutes a source of economic income and an important resource in pharmacopoeia for the local populations of the Mandara Mountains. These results could serve as a reference of strategies for the sustainable exploitation and conservation of this plant diversity.Keywords: Loranthaceae, parasitic species, pharmacopoeia, Mandara mountains, Cameroon.
5
Gorochov, A. V. "Taxonomic studies on the cricket subfamilies Pteroplistinae, Phaloriinae and Cacoplistinae (Orthoptera: Gryllidae) from the Old World." Zoosystematica Rossica 27, no. 1 (June 25, 2018): 40–76. http://dx.doi.org/10.31610/zsr/2018.27.1.40.
Full textAbstract:
A new material on the subfamilies Pteroplistinae, Phaloriinae and Cacoplistinae from the Indo-Malayan and Afrotropical regions of the Old World is considered. Nineteen new taxa of these subfamilies are described: Pteroplistes malaccanus sp. nov. from Malacca, P. borneoensis sabahi subsp. nov. from Borneo, Tramlapiola? bugiamap sp. nov. from Vietnam [Pteroplistinae]; Trellius (Zatrellius) kinabalu sp. nov., T. (Z.) crocker sp. nov. and T. (Z.) tawau sp. nov. from Borneo, T. (Neotrellius) logunovi sp. nov. and T. (N.) simulator sp. nov. from Vietnam, Borneloria spinosa gen. et sp. nov. and B. moorei occidentalis subsp. nov. from Borneo, Phaloria (Papuloria) multa sp. nov. from Sulawesi and a nearest island [Phaloriinae: Phaloriini]; Subtiloria semota sp. nov. and S. succinea korup subsp. nov. from Cameroon, Schizotrypus conradti nigericus subsp. nov. from Nigeria, Afrophaloria malawi sp. nov. from Malawi, A. dja sp. nov. from Cameroon [Phaloriinae: Subtiloriini]; Homoeogryllus ambo sp. nov. from Ethiopia, H. reticulatus limbe subsp. nov. from Cameroon [Cacoplistinae: Homoeogryllini]. New data on distribution of some other species are also given.
6
Mamia, Grace Florentine, Bita Gael Atangana, Sartrien Tagueu Kante, Romeo Martial Tchoffo-Fobasso, Arnol Auvaker Zebaze Tiofack, Herman Parfait Awono-Ambene, Gustave Simo, and Jean Arthur Mbida Mbida. "Human Africa Trypanosomiasis in Littoral Region of Cameroon: an Updated With First Evidence on the Circulation of Trypanosoma Brucei Gambiense in Manoka Island." International Journal of Scientific Research and Management 10, no. 10 (October 28, 2022): 721–30. http://dx.doi.org/10.18535/ijsrm/v10i10.mp03.
Full textAbstract:
Aims: A survey on Human African Trypanosomiasis (HAT) is essential for prevention and preparedness for epidemics. The objective of this study is to assess the circulation of human trypanosomes and their vectors across quiescent HAT foci of the Littoral Region of Cameroon.
Methodology: A descriptive study on the presence of Trypanosoma brucei gambiense and its potential vectors was carried out in Youpwe, Yabassi, Sodiko, Manoka island and Cape-Cameroon Island from February to April 2022.Tsetse flies collected from the five selected locations using pyramidal traps, were first classified by species according to their morphology, then by sub-species with Polymerase Chain Reaction Diagnostic (PCR-Diag). Trypanosoma species and sub-species were subsequently identified and genotyped using a Nested PCR.
Results: Glossina palpalis palpalis was the unique tsetse subspecies recorded across the five locations. The tsetse infection rate by Trypanosoma ssp. varied between 5.35% in Cape-island and 35.71% in Manoka island. Three Trypanosoma species were detected: T. brucei s.l. 32/500 (6.4%), T. congolense 15/500 (3.0%), and T. vivax 8/500 (1.6%). The sub-species T. b. gambiense responsible for HAT was detected in tsetse flies from Manoka (2/150: 1.33%), whereas T. congolense consisted of T. congolense “forest” and T. congolense “savannah” types.
Conclusion: The presence of T. b. gambiense and T. congolense sub-species in Manoka and nearby suggests residual circulation of human and animal trypanosomes in quiescent HAT foci of the littoral region of Cameroon.
7
Sintasath, David M., Nathan D. Wolfe, Matthew LeBreton, Hongwei Jia, Albert D. Garcia, Joseph Le Doux Diffo, Ubald Tamoufe, et al. "Simian T-Lymphotropic Virus Diversity among Nonhuman Primates, Cameroon." Emerging Infectious Diseases 15, no. 2 (February 2009): 175–84. http://dx.doi.org/10.3201/eid1502.080584.
Full text
8
Achiri, Tange, Oben Tabi, Tawung Leke, Manju Bi, Divine Nsobinenyui, Lendzemo Tatah, and Khumbah Njualem. "Influence of Tuber Seed Size on Susceptibility of Cipira Potato Variety to Aphid (Myzus persicae), and Potato Blight and Bacterial Wilt Diseases." Fundamental and Applied Agriculture 9, no. 2 (2024): 80. http://dx.doi.org/10.5455/faa.173907.
Full textAbstract:
Potato (Solanum tuberosum L.) is one of the most important tuber crops in the world and it is fourth among food crops after rice, wheat and maize. Potato is widely cultivated for its cheap source of carbohydrates, vitamins as well as minerals. In Cameroon, where potato provide a livelihood for most producers, especially in the Western highland, production is challenged by unavailability of appropriate seeds of local varieties or Cameroon improve varieties. Many decades ago, Cipira was released by the Institute of Agricultural Research for Development, Bambui, North West Region, Cameroon as an improved resistant variety. The current study evaluated the performance of Cipira considering seed sizes. Four seed sizes (20mm, 25mm, 30mm and 35mm diameter) were evaluated in a randomized complete block trial in Bambili in 2022 and 2023. Green peach aphid incidence was inversely related to tuber seed sizes (P < 0.05). Aphid population abundance was higher from plants with larger diameter. Late blight and bacterial wilt incidence and disease severity index was significantly higher for plants of smaller tuber seed size. Productivity was 8.06 t ha-1, 6.2 t ha-1, 5.7 t ha-1 and 5.8 t ha-1 from 35mm, 30mm, 25mm and 20mm tuber seed sizes, respectively in 2022. The yield in 2023 was 8.9 t ha-1, 7.8 t ha-1, 7.1 t ha-1, and 6.3 t ha-1, from 35mm, 30mm, 25mm and 20mm, respectively. For improved yield and reduced pest and diseases incidences, Cipira at 30 mm and 35 mm seed sizes are recommended.
9
Mama, Ndam, Tanyi Pamela Nyugha, Awemu Jonah Wayih, and Gildas Dohba Dinga. "Government Spending and Economic Growth: Keynes or Wagner for Cameroon? ARDL/T-Y-VAR Approach." Law and Economy 1, no. 3 (October 2022): 74–85. http://dx.doi.org/10.56397/le.2022.10.08.
Full textAbstract:
This study had as primordial objective, to empirically investigate the nature of the link between government expenditure and economic growth in Cameroon from 1977-2018. To realise this objective, data were collected from the World Bank World Development Indicators and the ARDL technique was employed to examine the short and long run effects of government expenditure on economic growth in Cameroon. Then the VAR model, following the Toda-Yamamoto (1995) specification which is an ameliorated version of the traditional VAR model developed by Sims (1980) and Granger (1969) were employed to examine the nature of the link between the variables. The outcome from the ARDL model indicates that there is short run significant negative effect of government expenditure on economic growth while in the long run, there is a positive and insignificant effect. The result from the VAR model shows that there is a unidirectional causal relationship from growth to government expenditure. This result supports the Wagner’s law of expanding state activities for Cameroon. The findings suggest that instead of involving in increased spending as a means to guarantee sustainable growth, government should focus on policies that would create the enabling environment for growth to thrive like control of corruption and reforms in the financial sector to attract more private investment and the strengthening of state institutions.
10
Abah, Samuel, Silas Lendzele Sevidzem, Alexandre Michel Njan Nloga, Archile Paguem, Abdoulmoumini Mamoudou, Jacques François Mavoungou, and Andre Zoli. "“Silent” circulation of Trypanosoma spp. in Tabanids (Diptera: Tabanidae) and Cattle in a Tsetse free Range land of Ngaoundere (Adamawa-Cameroon)." International Journal of Biological and Chemical Sciences 14, no. 7 (December 7, 2020): 2611–18. http://dx.doi.org/10.4314/ijbcs.v14i7.19.
Full textAbstract:
The Adamawa region falls within the tsetse belt of Cameroon but harbours isolated pockets of tsetse free range lands like Ngaoundere. There is no report on the occurrence of tsetse and bovine trypanosomosis in Ngaoundere. To provide information on this subject, two Vavoua traps were used to trap vectors of bovine trypanosomiasis and at the same time, blood was collected from cattle. Genomic DNA was extracted from buffy coat of cattle blood (n=42) and biting flies (n=53). The nested PCR was used to screen the samples for Trypanosoma spp. During the 14 days of trapping in November and December 2017 in Ngaoundere, 127 flies were documented and classified under two taxa: Tabanidae and Stomoxyini. Three Trypanosoma spp. DNA was isolated from tabanid (18.9%) samples and identified as T. theileri, T. vivax and T. evansi and two of them that is T. theileri (4%) and T. vivax (3%) were also detected in cattle (7%). There was no case of trypanosome DNA isolated from all the screened Stomoxyini. This result indicates the “silent” transmission of T. theileri and T. vivax by tabanids in the absence of glossines in Ngaoundere.Keywords: Trypanosomes, tabanids, stomoxyini, PCR, Ngaoundere, Adamawa-Cameroon.
11
Abang, Albert Fomumbod, Samuel Nanga Nanga, Apollin Fotso Kuate, Christiant Kouebou, Christopher Suh, Cargele Masso, May-Guri Saethre, and Komi Kouma Mokpokpo Fiaboe. "Natural Enemies of Fall Armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) in Different Agro-Ecologies." Insects 12, no. 6 (May 31, 2021): 509. http://dx.doi.org/10.3390/insects12060509.
Full textAbstract:
Fall armyworm (FAW) Spodoptera frugiperda (J.E. Smith) and southern armyworm (SAW) Spodoptera eridania (Stoll) have become major threats to crops in Africa since 2016. African governments adopted emergency actions around chemical insecticides, with limited efforts to assess the richness or roles of indigenous natural enemies. Field surveys and laboratory studies were conducted to identify and assess the performance of parasitoids associated with spodopterans in Cameroon. FAW was the most abundant spodopteran pest. Telenomus remus (Nixon), Trichogramma chilonis (Ishi), Charops sp. (Szépligeti), Coccygidium luteum (Cameron), Cotesia icipe (Fernandez & Fiaboe), and Cotesia sesamiae (Cameron) are the first records in the country on spodopterans. Telenomus remus, T. chilonis, C. icipe, and Charops sp. were obtained from both FAW and SAW; C. luteum and C. sesamiae from FAW. The distribution of spodopterans, their endoparasitoids, and parasitism rates varied with host, season and location. In the laboratory, T. remus showed significantly higher parasitism on FAW than SAW, and significant differences in the development parameters between the two host eggs, with shorter development time on FAW. It induced significant non-reproductive mortality on FAW but not on SAW. Developmental parameters showed that C. icipe has a shorter development time compared to other larval parasitoids. Implications for conservative and augmentative biocontrol are discussed.
12
Corbet, Sylvie, Michaela C. Müller-Trutwin, Pierre Versmisse, Severine Delarue, Ahidjo Ayouba, John Lewis, Soren Brunak, et al. "env Sequences of Simian Immunodeficiency Viruses from Chimpanzees in Cameroon Are Strongly Related to Those of Human Immunodeficiency Virus Group N from the Same Geographic Area." Journal of Virology 74, no. 1 (January 1, 2000): 529–34. http://dx.doi.org/10.1128/jvi.74.1.529-534.2000.
Full textAbstract:
ABSTRACT Human immunodeficiency virus type 1 (HIV-1) group N from Cameroon is phylogenetically close, in env, to the simian immunodeficiency virus (SIV) cpz-gab from Gabon and SIVcpz-US of unknown geographic origin. We screened 29 wild-born Cameroonian chimpanzees and found that three (Cam3, Cam4, and Cam5) were positive for HIV-1 by Western blotting. Mitochondrial DNA sequence analysis demonstrated that Cam3 and Cam5 belonged to Pan troglodytes troglodytes and that Cam4 belonged to P. t. vellerosus. Genetic analyses of the viruses together with serological data demonstrated that at least one of the two P. t. troglodytes chimpanzees (Cam5) was infected in the wild, and revealed a horizontal transmission between Cam3 and Cam4. These data confirm that P. t. troglodytes is a natural host for HIV-1-related viruses. Furthermore, they show that SIVcpz can be transmitted in captivity, from one chimpanzee subspecies to another. All three SIVcpz-cam viruses clustered with HIV-1 N inenv. The full Cam3 SIVcpz genome sequence showed a very close phylogenetic relationship with SIVcpz-US, a virus identified in aP. t. troglodytes chimpanzee captured nearly 40 years earlier. Like SIVcpz-US, SIVcpz-cam3 was closely related to HIV-1 N inenv, but not in pol, supporting the hypothesis that HIV-1 N results from a recombination event. SIVcpz from chimpanzees born in the wild in Cameroon are thus strongly related inenv to HIV-1 N from Cameroon, demonstrating the geographic coincidence of these human and simian viruses and providing a further strong argument in favor of the origin of HIV-1 being in chimpanzees.
13
Tchuifon Tchuifon, Donald Raoul, Hui-Zhen Fu, and Yuh-Shan Ho. "Cameroon publications in the Science Citation Index Expanded: Bibliometric analysis." Revista de Biología Tropical 65, no. 4 (September 19, 2017): 1582. http://dx.doi.org/10.15517/rbt.v65i4.27101.
Full textAbstract:
Cameroon is one of the six countries of Central Africa with more than 20 000 000 residents. To characterize the Cameroon research performance, Cameroonians publications in the Science Citation Index Expanded during the period of 1936-2015, indexed in the Thomson Reuters SCI-EXPANDED database, were studied in this work. All documents of that period with Cameroon in the address field were included in the study. The document type, language, trend and collaborations were analyzed, as well as the output of different subject categories. Performances of countries, institutions and authors, including total, single, collaborative, first author, and corresponding author publications were also analyzed. Articles were analyzed by the scientific output and research performances of individuals, institutions and collaborative countries with Cameroon. Analyses included 8 457 articles (85 % of 10 591 Cameroonian publications). These bibliometric analyses of Cameroonian publications provided interesting insights concerning authors, institutions and collaboration patterns. Results showed that research in Cameroon was highly dependent on foreign collaborations, and the international collaboration was responsible for the increasing number of publications over the years. It was found that the articles with either first authors or corresponding authors from outside Cameroon got more citations than the others, and that the articles without any international collaboration had lower citations. The number of articles indexed by SCI-EXPANDED has seen an increase in terms of Cameroonian articles that is considerably greater that the increase in number of all articles in SCI-EXPANDED. Articles were more frequent than other types of publication and they were mostly in English. The University of Yaoundé I ranked top one in inter-institutionally collaborative articles, the rank of the total inter-institutionally collaborative articles, and the rank of first author articles and corresponding author articles. The University of Yaoundé I also was in an absolute leading position from 1970s to 2015, followed far away by the other institutions. The categories of tropical medicine, plant sciences, environmental and occupational public health, and infectious diseases, represented the largest number of published articles. Even though physics and chemistry dominated the ranking of the top 20 best Cameroonian authors, an independent mathematics article was the most cited, with 60 citations in 2015 to a Cameroonian author. The top three productive researchers were T. C. Kofane, B. T. Ngadjui, P. Woafo, all from University of Yaoundé I. France and the USA dominated the ranking of countries with strong scientific collaboration with Cameroon.
14
Ndzomo Ngono, Jean-Philippe, Serges Tchatchouang, Mireille Victorine Noah Tsanga, Earnest Njih Tabah, Albert Tchualeu, Kingsley Asiedu, Lorenzo Giacani, Sara Eyangoh, and Tania Crucitti. "Ulcerative skin lesions among children in Cameroon: It is not always Yaws." PLOS Neglected Tropical Diseases 15, no. 2 (February 16, 2021): e0009180. http://dx.doi.org/10.1371/journal.pntd.0009180.
Full textAbstract:
Outbreaks of yaws-like ulcerative skin lesions in children are frequently reported in tropical and sub-tropical countries. The origin of these lesions might be primarily traumatic or infectious; in the latter case, Treponema pallidum subspecies pertenue, the yaws agent, and Haemophilus ducreyi, the agent of chancroid, are two of the pathogens commonly associated with the aetiology of skin ulcers. In this work, we investigated the presence of T. p. pertenue and H. ducreyi DNA in skin ulcers in children living in yaws-endemic regions in Cameroon. Skin lesion swabs were collected from children presenting with yaws-suspected skin lesions during three outbreaks, two of which occurred in 2017 and one in 2019. DNA extracted from the swabs was used to amplify three target genes: the human β2-microglobulin gene to confirm proper sample collection and DNA extraction, the polA gene, highly conserved among all subspecies of T. pallidum, and the hddA gene of H. ducreyi. A fourth target, the tprL gene was used to differentiate T. p. pertenue from the other agents of human treponematoses in polA-positive samples. A total of 112 samples were analysed in this study. One sample, negative for β2-microglobulin, was excluded from further analysis. T. p. pertenue was only detected in the samples collected during the first 2017 outbreak (12/74, 16.2%). In contrast, H. ducreyi DNA could be amplified from samples from all three outbreaks (outbreak 1: 27/74, 36.5%; outbreak 2: 17/24, 70.8%; outbreak 3: 11/13, 84.6%). Our results show that H. ducreyi was more frequently associated to skin lesions in the examined children than T. p. pertenue, but also that yaws is still present in Cameroon. These findings strongly advocate for a continuous effort to determine the aetiology of ulcerative skin lesions during these recurring outbreaks, and to inform the planned mass treatment campaigns to eliminate yaws in Cameroon.
15
Norgrove, L., and S. Hauser. "Leaf properties, litter fall, and nutrient inputs of Terminalia ivorensis at different tree stand densities in a tropical timber - food crop multistrata system." Canadian Journal of Forest Research 30, no. 9 (September 1, 2000): 1400–1409. http://dx.doi.org/10.1139/x00-063.
Full textAbstract:
Tree litter fall was monitored for 2 years in two Terminalia ivorensis A. Chev. plantations in the humid tropics of southern Cameroon. The plantations were 6 and 17 years old when they were each thinned to two timber stand densities (TSD) and understorey food crops were introduced. Leaf litter was the predominant litter fraction in all treatments. Treatment means of specific leaf area for T. ivorensis ranged from 83.7 to 100.7 cm2·g-1. Litter-fall production, leaf area per tree, and leaf area index for T. ivorensis were all higher in year 2 than in year 1. There was near complete defoliation of the T. ivorensis stand by Epicerura sp. (Lepidoptera: Notodontidae) caterpillars in the month just before the start of litter-fall sampling. This is the first report of an Epicerura sp. from Cameroon. Terminalia ivorensis leaf litter production per tree, specific leaf area, and leaf litter nutrient concentrations showed few significant differences between TSD treatments. This lack of response suggests that T. ivorensis is a suitable species for growing at stand densities lower than is normal silvicultural practice in association with food crops.
16
Sagnia, Bertrand, Francis Ateba Ndongo, Suzie Ndiang Moyo Tetang, Judith Ndongo Torimiro, Cristiana Cairo, Irenée Domkam, Geraldine Agbor, et al. "Reference Values of Lymphocyte Subsets in Healthy, HIV-Negative Children in Cameroon." Clinical and Vaccine Immunology 18, no. 5 (March 16, 2011): 790–95. http://dx.doi.org/10.1128/cvi.00483-10.
Full textAbstract:
ABSTRACTLymphocyte subset reference values used to monitor infectious diseases, including HIV/AIDS, tuberculosis, malaria, or other immunological disorders in healthy children in Cameroon, are lacking. Values for Caucasian cohorts are already being utilized for clinical decisions but could be inappropriate for African populations. We report here the immunological profile for children aged from birth through 6 years in Cameroon and also compare our values to data from other African and Caucasian populations. In a cohort of 352 healthy children, aged 0 to 6 years, the relative and absolute numbers of T-cell subsets, B cells, and NK lymphocytes were determined from peripheral blood collected in EDTA tubes. Samples were stained with BD Multitest reagents in Trucount tubes and analyzed by using CellQuest-Pro and FlowJo software. We evaluated about 23 different lymphocyte subsets in which the absolute number and percentage values differed significantly (P< 0.05) with age and peaked between 6 and 12 months. B-cell values were higher compared to reported values from developed countries. Differences in activated and differentiated T cells were observed in subjects between 1 and 6 years of age. The absolute CD8+T-cell count and the CD4+/CD8+ratio seem to depend on gender. Normal lymphocyte subsets values among children from Cameroon differ from reported values in Caucasian and some African populations. The differences observed could be due to genetic and environmental factors coupled with the methodology used. These values could be used as initial national reference guidelines as more data are assembled.
17
Demgne Bemmo, Gaddielle Leslie, Mariette Anoumaa, Christelle Mbakop Nya, and Gabriel Kanmegne. "Peasants’ perceptions on the uses and exploitation of <i>Tetracarpidium conophorum</i> (Mull. Arg.) Hutch & Dalziel in Cameroon." Cameroon Journal of Experimental Biology 18, no. 01 (June 30, 2024): 07–13. http://dx.doi.org/10.4314/cajeb.v18i01.2.
Full textAbstract:
Tetracarpidium conophorum (Mull. Arg.) Hutch & Dalziel, a vine of the Euphorbiaceae family, is one of the numerous useful plant species of the tropical forests, and is still exploited in the wild. The objective of this study was to understand peasants’ perceptions on the provisioning ecosystem services and the cultivation practice of T. conophorum in Cameroon, with a view to determining the suitability of this species for participatory domestication. The methodological approach consisted of ethnobotanical surveys carried out among 252 people spread across three agroecological zones of Cameroon, as well as field observations. The results showed that 100% of respondents know the species that they exploit for three categories of use, with a broad consensus for food use (Cs = 1), followed by energy use (Cs = 0, 92) and medicinal use (Cs = 0.17). The exploitation of the species provides income which is considered very important by 69% of respondents. The most common harvesting method in the study areas is fruit picking, which is practiced by 100% of respondents. A regressive trend in the dynamics of the T. conophorum population is perceived by 44% of respondents. According to 92% of respondents, cultivation habits of the species are almost non-existent due to the difficulty they experience in regenerating it (51% of respondents), the long duration of the vegetative growth phase (36%) and the uncertainty of fruits production (13%). All the interviewees (100%) expressed their desire to adopt the cultivation of the species if appropriate methods for propagating productive individuals were provided to them. This study shows that T. conophorum is conducive to participatory domestication in Cameroon.
18
Veloso, A. C. R., H. F. Lopes, L. F. X. Santos, V. S. Martins Júnior, S. A. Fonseca, T. A. X. Santos, A. D. Matias, R. T. Careli, E. R. Duarte, and T. G. S. Braz. "Elephant grass silage inoculated with cellulolytic fungi isolated from rumen." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 75, no. 5 (October 2023): 981–92. http://dx.doi.org/10.1590/1678-4162-12984.
Full textAbstract:
ABSTRACT The objective was to evaluate the inoculation with Aspergillus terreus and/or Trichoderma longibrachiatum on fermentation, chemical and microbiological composition of elephant grass ‘Cameroon’ silage (Cenchrus purpureus). Treatments were A. terreus at 105 colony forming units (CFU)/g (AT15), T. longibrachiatum at 105 CFU/g (TL20), a mixture of both at 105 CFU/g (MIX), and a control group without inoculation (CONTR). The design was completely randomized with seven replicates. The MIX silage was most stable, while CONTR, AT15, and TL20, had lower dry matter losses. There was no effect of inoculation in the chemical composition of silages. Only MIX silage (4.40) had pH above the minimum of 4.2 for humid grass silage and above the control (4.05). Bacteria from Diplococcus genus was identified at the opening of TL20 and CONTR silages. After air exposure, the population of rods, Lactobacillus, and total lactic acid bacteria was higher in theTL20 and MIX. The inclusion of a T. longibrachiatum and A. terreus mixture increases dry mater loss and silage pH. T. longibrachiatum was more efficient in maintaining populations of total lactic acid bacteria after opening; therefore, this strain has potential as an additive for elephant grass ‘Cameroon’ silage.
19
Junie, Tchouankam Klorane, Mbog Michel Bertrand, Bayiga ElieConstant, Tassongwa Bernard, NgonNgon Gilbert François, Apouamoun Yiagnigni Roland, Kenfack JeanVictor, and Etame Jacques. "Economic Potential of Gold in Batouri (Eastern Cameroon)." Earth Science Research 9, no. 2 (May 6, 2020): 21. http://dx.doi.org/10.5539/esr.v9n2p21.
Full textAbstract:
The aim of this work is the valorization of the economic potential of gold in the Batouri region. The study is undertaken on five sites of which two alluvials (Djengo and Mongonam localities) made up of flat and river gold, two eluvials (Kambele and Bote) containing gold of veins in quarries, and one semi mechanized exploitation (METALICON) working on the two previous types. Laboratory works consist of traditional melting, determination of the various grades of gold through densimetry and spectrometry analysis and refining using the Miller Chloration method. The main results from these analyses are: i) recovery concentration is low, (about 0.5 g/t) for the traditional mining and higher with the semi mechanization (1.5-2 g/t). Densimetry and spectrometry analyses show that gold of semi mechanized sites has an average grade of about 24 carats, 22 carats and 20 for alluvial and eluvial gold respectively. ii) For 26 kg of gold refined, a weight of 16.681 kg is obtained at a cost of 4 051 946 (four million fifty one thousand and nine hundred forty six) CFA F. Spectrometry analyses reveal the presence of silver and copper impurities, elements that can still be valorized through the presence of a gold refining unit. Hence, the absence of a gold refining unit in our country leads to poor transformation of its ores and loss of devices.
20
Iyob, Ruth. "VICTOR T. LE VINE." PS: Political Science & Politics 43, no. 04 (October 2010): 804–5. http://dx.doi.org/10.1017/s1049096510001472.
Full textAbstract:
Victor T. Le Vine, professor emeritus of political science, analyst, and commentator, died on May 7, 2010, after a brief illness. Le Vine, an only son, was born in Berlin in 1928. His family fled Nazi Germany and lived in France until they immigrated to the United States in 1938. A polyglot, fluent in French, German, and Russian, he was a rigorous researcher, a dedicated teacher, and an encyclopedic repository of classical works in politics, history, literature, and music. He mentored hundreds of graduate and undergraduate students in his 47 years as an academic and was known for using his multilingual skills and photographic memory to make every class lecture come alive—at times accompanying them with his vivid newspaper clippings that he collected from his travels. In his classroom, the politics of the postcolonial world were peppered with vignettes of his experiences as a participant observer in the heyday of Africa's decolonization. He shared with his students the emergence of the political systems of diverse countries such as Benin, Cameroon, Cyprus, the Czech Republic, Eritrea, Ghana, France, Israel, the PRC, Rwanda, Saudi Arabia, Turkey, and Zaire (DRC).
21
Nankam, Roland Chimi, Justin Kouamo, Armelle Prudence Kouengoua Kouengoua, Grace Jedida Toukem Tchinze, Müller Fotsac Dzousse, Sandra Vanessa Gapgueu, Ranyl Nguena Guefack Noumedem, and Ferdinand Ngoula. "Seroprevalence and Risk Factors Associated with Toxoplasma gondii and Chlamydophila abortus Infection in Domestic Small Ruminants in Cameroon." Parasitologia 2, no. 3 (July 5, 2022): 198–205. http://dx.doi.org/10.3390/parasitologia2030017.
Full textAbstract:
Toxoplasmosis and chlamydiosis remain among the primary causes of abortion and fetal loss in small ruminants. Consequently, they are a source of considerable economic losses for farmers. The objectives of this study were to determine the seroprevalence and highlight the risk factors associated with Toxoplasma gondii and Chlamydophila abortus infection in small ruminants in Cameroon. A cross-sectional study was conducted in 200 small ruminant farms during a period from April to October 2021. A total of 1061 small ruminants were sampled, and the sera obtained were analyzed using the indirect ruminant multi-species ELISA test for specific IgG antibody detection for T. gondii and C. abortus at the National Veterinary Laboratory. A questionnaire was constructed to collect information about flock management and risk factors possibly associated with T. gondii and C. abortus infection in goats and sheep. Overall, 329 small ruminants tested positive for T. gondii-specific IgG antibodies and 45 for C. abortus-specific IgG antibodies with a seroprevalence of 31.1% (95% CI: 28.2–33.8) for T. gondii and 4.2% (95% CI: 3.0–5.5) for C. abortus, respectively. However, a significant co-infection of 1.8% (95% CI: 0.37–3.3) was obtained between T. gondii and C. abortus (p = 0.02). Linear regression model analysis revealed that, the seroprevalence of T. gondii at the flock level was significantly correlated with the region (0.22 CI: 0.17; 0.26) the breeding objectives (0.36 CI: 0.17; 0.56) the level of hygiene (0.11 CI: 0.01; 0.21) and presence abortions (0.55 CI: 0.46; 0.64) on the farms and that of C. abortus was significantly correlated with the regions (0.01 CI: 0.00–0.02) and degree of abortion on the farms (−0.26 CI: −039; −0.14). At the individual level, a significant correlation was observed between the seroprevalence of T. gondii and region (−0.09 CI: −0.14; −0.04), species (0.07 CI: 0.01–0.14), sex (−0.11 CI: −0.18; −0.03), age (0.08 CI: 0.04–0.12) and physiological status (0.21 CI: 0.18; 0.24). For C. abortus seroprevalence, a significant correlation was observed with the regions (0.02 CI: 0.00; 0.03) and breed (0.01 CI: 0.01; 0.02) of small ruminants reared in the northern regions of Cameroon. These results could be used to implement efficient management measures to prevent and control T. gondii and C. abortus infection in goats and sheep in Cameroon.
22
Mana, Djibrilla, Haiwa Gilbert, Kengne Olivier Clovis, Souare Konsala, and Ibrahima Adamou. "ASSESSMENT OF INFESTATION AND DISTRIBUTION OF LORANTHACEAE ON WOODY PLANTS OF THE MANDARA MOUNTAINS OF THE FAR NORTH REGION, CAMEROON." International Journal of Advanced Research 12, no. 04 (April 30, 2024): 1128–41. http://dx.doi.org/10.21474/ijar01/18653.
Full textAbstract:
Loranthaceae are a permanent danger to many woody plant species. The present study was carried out with the aim of evaluating the degree of parasitism of Loranthaceae on woody species of the Mandara Mountains in the Far North Region of Cameroon. A methodological approach based on surface surveys was adopted. On the hills, the species of Loranthaceae encountered and the host plants have been identified. The botanical inventory revealed a floristic composition of 73 species of phorophytes distributed in 43 genera and 24 families. These phorophytes are parasitized by 7 species of Loranthaceae (Agelanthus dodoneifolius, Globimetula braunii, Phragmanthera capitata, Tapinanthus bangwensis, T. belvisii, T. globiferus and T. ophiodes), distributed in 4 genera (Agelanthus, Globimetula, Agmanthera and Tapinanthus). T. globiferus and A. dodoneifolius are the most abundant ubiquitous Loranthaceae species of the 7 parasitic species inventoried and identified on the Mandara Mountains. The average parasite rate of the inventoried phorophytes is 27.35% andthe average infestation intensity is 4.07 tufts / plant. This rate and the intensity of infestation vary among plant families. The distribution of Loranthaceae tufts follows an ascending curve. Parasitism of woody plants by Loranthaceae species therefore represents a considerable threat to phorophytes. It would therefore be wise to explore the means of combating Loranthaceae, for the conservation of plant biodiversity which integrates sustainable development in the Far North Region, Cameroon.
23
Tsozué, Désiré, Nérine Mabelle Moudjie Noubissie, Estelle Lionelle Tamto Mamdem, Simon Djakba Basga, and Dieudonne Lucien Bitom Oyono. "Effects of environmental factors and soil properties on soil organic carbon stock in a natural dry tropical area of Cameroon." SOIL 7, no. 2 (October 11, 2021): 677–91. http://dx.doi.org/10.5194/soil-7-677-2021.
Full textAbstract:
Abstract. Research carried out on soil organic carbon stock (SOCS) in the Sudano-Sahelian region of Cameroon is very rare. The few existing studies are mostly available in reports and concern in most cases carbon stocks in plant biomass. In order to contribute to the documentation on soils in this part of the country, the present work was designed to evaluate the SOCS in the main soil types and the influence of environmental factors and soil properties on these stocks under the natural dry tropical area of the Sudano-Sahelian zone of Cameroon. The study was undertaken in four sites, including three natural forest reserves (Laf, Zamai, Kosohon) and one national park (Mozogo), located at different latitudes. Three replicates were collected at each site, giving rise to three sampling points chosen per site, from 0 to 75 cm depth, for the determination of SOCS. At each sampling point, soils were sampled using depth increments of 25 cm from the surface. The studied area is covered by Haplic Vertisols, Dystric Arenosols, Dystric Leptosols and Dystric Planosols. Total SOCS (T-SOCS) content, which refers to a depth of 75 cm, decreases with increasing latitude, with 249±26.26 Mg ha−1 in Vertisols at Laf forest reserve most southerly located, 199±8.00 Mg ha−1 in Arenosols at Zamai forest reserve, 166±16.63 Mg ha−1 in Leptosols at Kosohon forest reserve and 161±8.88 Mg ha−1 in Planosols at Mozogo national park most northerly located, regardless of the altitude. No significant correlation was noted between T-SOCS and the altitude. A good correlation was noted between precipitation which decreases with increasing latitude and T-SOCS, indicating the importance of climate in the distribution of T-SOCS in the study area, which directly influences the productivity of the vegetation. More than 60 % of the SOCS was stored below the first 25 cm from the soil surface, a peculiarity of SOCS in drylands. The SOCS in the Sudano-Sahelian area of Cameroon is mainly influenced by climate and vegetation.
24
Ngomeni, Arlende Flore, Emmanuel Lucien Nomo Bidzanga, Marie Louise Avana, Martin Ngankam Tchamba, Cédric Djomo Chimi, and Cédric Djomo Chimi. "Potentiel de séquestration du carbone des agroforêts à base de caféier robusta (Coffea canephora var. robusta) dans les bassins de production du Cameroun." International Journal of Biological and Chemical Sciences 15, no. 6 (February 23, 2022): 2652–64. http://dx.doi.org/10.4314/ijbcs.v15i6.31.
Full textAbstract:
Une étude en vue d’évaluer le potentiel de séquestration du carbone des Agroforêts à base de Caféiers Robusta (ACR) a été menée dans quatre sites contrastés par leurs caractéristiques biophysiques et socioéconomiques, et appartenant à trois bassins de production du café au Cameroun. L’approche méthodologique a porté sur la collecte des données d’inventaires dans 120 ACR de différents âges (30 par site); lesquelles ont permis d’estimer le potentiel de séquestration du carbone de façon non-destructive en utilisant les équations allométriques. Le potentiel de séquestration du carbone évalués ont varié significativement entre les sites, de 67,84±45,41 t C.ha-1 à Ayos à 41,94±15,50 t C.ha-1 à Nkongsamba. Globalement, ces potentiels de séquestration du carbone diminuaient suivant le gradient d’anthropisation des sites d’étude. Les ACR des classes d’âge (années) de [30-45[et de [45-60[ont eu les potentiels de séquestration du carbone les plus élevés pour les Espèces associées (EA) et les caféiers respectivement. Le potentiel de séquestration du carbone des EA endogènes (19,46 t C.ha-1 ) était plus élevé que celui des EA introduites (6,32 t C.ha-1). Ces résultats montrent que la contribution des ACR dans les mécanismes d’atténuation des effets du changement climatique est une évidence qu’il faudrait capitaliser.
English title: Carbon sequestration potential of robusta coffee agroforests (Coffea canephora var. robusta) in production basins of Cameroon
A study to assess the carbon sequestration potential of Robusta coffee Agroforests (RCAs) was carried out in four sites, contrasted by their biophysical and socio-economic characteristics, and belonging to three coffee production basins in Cameroon. The methodological approach involves the collection of inventory from 120 RCAs of different ages, (30 per site), which allowed no-destructive estimation of carbon stocks using. The assessed carbon sequestration potentials evaluated varied significantly between sites, from 67.84 ± 45.41 Mg C.ha-1 in Ayos to 41.94 ± 15.50 Mg C.ha-1 in Nkongsamba. Overall, these carbon sequestration potentials decreased along the anthropization gradient of the study sites. RCAs of the [30-45[ and [45-60 [age classes (years) had the highest carbon sequestration potentials for associated species (Eas) and coffee trees respectively. The potential of carbon sequestration of the endogenous EA (19.46 Mg C.ha -1 ) was higher than that of the introduced EA (6.32 Mg C.ha -1). These results show that the contribution of RCAs in climate change mitigation mechanisms is evident and should be capitalized upon.
25
Breteler, F. J. "THECACORIS, INCLUDING CYATHOGYNE (PHYLLANTHACEAE), IN WEST AFRICA: GENERIC DELIMITATION, DESCRIPTION OF A NEW SPECIES, AND A SYNOPSIS OF ALL WEST AFRICAN SPECIES." Edinburgh Journal of Botany 68, no. 3 (October 18, 2011): 343–50. http://dx.doi.org/10.1017/s096042861100028x.
Full textAbstract:
The separation of Thecacoris and Cyathogyne (Phyllanthaceae, formerly Euphorbiaceae) is discussed and it is concluded that they should remain united. A separation of the continental forest species (except Thecacoris viridis (Müll.Arg.) Leandri ex G.L.Webster) awaits molecular investigation. Thecacoris micrantha sp. nov. is described and illustrated. Thecacoris grandifolia (Pax & K.Hoffm.) Govaerts from Cameroon is neotypified. Thecacoris membranacea Pax and T. annobonae Pax & K.Hoffm. are lectotypified and placed in synonymy under T. stenopetala (Müll.Arg.) Müll.Arg. and T. trichogyne Müll.Arg., respectively. Thecacoris manniana (Müll.Arg.) Müll.Arg. is united with T. stenopetala under the latter name. A key to and a synopsis of the West African species is provided.
26
Anchimbe, Eric A. "The Roots of the Anglophone Problem: Language and Politics in Cameroon." Current History 117, no. 799 (May 1, 2018): 169–74. http://dx.doi.org/10.1525/curh.2018.117.799.169.
Full text
27
Tarawali, G., and E. T. Pamo. "A Case for On-farm Trials of Fodder Banks on the Adamawa Plateau in Cameroon." Experimental Agriculture 28, no. 2 (April 1992): 229–35. http://dx.doi.org/10.1017/s0014479700019669.
Full textAbstract:
SUMMARYThe poor quality of the natural vegetation in the dry season affects both animal productivity and the lives of the pastoral community in the Adamawa Plateau of Cameroon but may be improved by introduction of the forage legume Stylosanthes guianensis. When used in a ‘fodder bank’ system, Stylosanthes grew to an average plant height of 1.41 m, had a dry matter productivity of 5.5 t ha−1 and comprised 93.4% of the pasture's botanical composition at the end of the growing season, indicating that fodder banks have considerable potential to enhance animal and crop production in Cameroon. Complementary studies conducted in Nigeria on the yield benefits of cropping leguminous pastures support the feasibility of using fodder banks as a means of improving the livelihoods of small scale farmers.
28
Grebennikov, Vasily V. "Sky islands of the Cameroon Volcanic Line support the westernmost clade of five new Typoderus weevils (Coleoptera: Curculionidae: Molytinae)." Arthropod Systematics & Phylogeny 79 (April 20, 2021): 57–74. http://dx.doi.org/10.3897/asp.79.e66021.
Full textAbstract:
Abstract The weevil genus Typoderus is for the first time reported west of the Congo basin. Analysis of 2,136 aligned positions from one mitochondrial and two nuclear fragments revealed a moderately supported clade of five new Cameroonian species: T. amphionsp. nov. (Mt. Oku), T. canthussp. nov. (Mt. Oku), T. clytiussp. nov. (Mt. Cameroon), T. iphitussp. nov. (Mt. Kupe) and T. telamonsp. nov. (Mt. Kupe). Molecular clock analysis of 20 DNA barcode fragments using a fixed substitution rate estimated divergences within this clade to be during the Middle to Late Miocene (10.5–5.4 million years ago, MYA), which pre-dates the onset of the Pliocene-Pleistocene global climatic fluctuations and corresponding cycles of African forest size fluctuation. Such relatively old dates are unexpected and might reflect four unavoidable shortcomings of the temporal analysis: 1. undersampled ingroup, 2. scarcity of comparative temporal data for other animal clades from the Cameroon Volcanic Line, 3. oversimplification of a fixed-rate molecular clock approach using a single maternally-inherited protein-coding marker and 4. possible overestimation of comparatively old ages when using largely saturated mitochondrial sequences. Two obscure weevil species from the Republic of the Congo are hypothesized to belong to the genus Typoderus: T. distinctus (Hoffmann, 1968) comb. nov. (from Anchonidium subgenus Neoanchonidium) and T. baloghi (Hoffmann, 1968) comb. nov. (from Anchonidium subgenus Subanchonidium). Three genus-group names are newly synonymized under Typoderus: Entypoderus Voss, 1965 syn. nov. (the only non-nominative subgenus of Typoderus), Neoanchonidium Hoffmann, 1968 syn. nov. (subgenus of Anchonidium) and Subanchonidium Hoffmann, 1968 syn. nov. (subgenus of Anchonidium). Habitus images and other supplementary information of all sequenced specimens are available online at dx.doi.org/10.5883/DS-VGDS005 and dx.doi.org/10.5883/DS-VGDS006.
29
Payne, Vincent Khan, Tsonang Tassongwa Florence Cécile, Yamssi Cedric, Noumedem Anangmo Christelle Nadia, and Ouaba José. "Risk Factors Associated with Prevalence of Candida albicans, Gardnerella vaginalis, and Trichomonas vaginalis among Women at the District Hospital of Dschang, West Region, Cameroon." International Journal of Microbiology 2020 (August 5, 2020): 1–6. http://dx.doi.org/10.1155/2020/8841709.
Full textAbstract:
Background. Vaginal or genitourinary infections are a major cause of morbidity, sterility, and increase in the vulnerability to cancers and HIV/AIDS infection. The aim of this study was to determine the prevalence of vaginal infections of C. albicans, G. vaginalis, and T. vaginalis among women in the locality of Dschang, West Region of Cameroon. Method. A prospective study was carried out in the District Hospital of Dschang. After obtaining informed consent, one thousand and one (1001) samples of vaginal swabs were collected. Biological diagnosis was carried out on fresh samples, Gram stained, and then cultivated in Sabouraud agar in a Petri dish, in order to isolate and identify the various infectious agents. Results. Five hundred and twenty-five (525) women were diagnosed positive, hosting at least one of these microorganisms, making an overall prevalence of 52.44%. Two hundred and fifty-six (256) women (25.57%) were infected with C. albicans, and 171 (17.08%) with G. vaginalis. Ninety-five (9.49%) were infected with both C. albicans and G. vaginalis, 2 (0.20%) with C. albicans and T. vaginalis, and 1 (0.1%) with G. vaginalis and T. vaginalis. Conclusion. Drastic measures should be taken in order to improve life styles to regress the frequency of these infections. Results obtained in this study, will help to educate and shed more light on the prevalence of vaginal infections in the West Region of Cameroon.
30
Njiokou, F., G. Simo, S. W. Nkinin, C. Laveissière, and S. Herder. "Infection rate of Trypanosoma brucei s.l., T. vivax, T. congolense “forest type”, and T. simiae in small wild vertebrates in south Cameroon." Acta Tropica 92, no. 2 (October 2004): 139–46. http://dx.doi.org/10.1016/j.actatropica.2004.04.011.
Full text
31
Kamga, R., C. Kouamé, and E. Akyeampong. "Vegetable consumption patterns in Yaounde, Cameroon." African Journal of Food, Agriculture, Nutrition and Development 13, no. 57 (April 25, 2013): 7399–414. http://dx.doi.org/10.18697/ajfand.57.11190.
Full textAbstract:
A survey was conducted in August and September 2008 in Yaoundé, Cameroon to assess vegetable consumption attitudes, constraints and factors that stimulate households’ consumption. Stratified sample based on district size, socioeconomic status and ethnics groups were used. Three hundred households were interviewed using a questionnaire and t here were four times as many women as men in the sample. Data were analyzed using SNAP. More than 80% of the respondents were educated at the secondary (54%) and tertiary (30%) levels. The respondents were generally the wife (35%) or children (30%), and sometimes the husband (20%). More than 50% of the respondents were landlords living in their own homes and the rest were tenant s. On average, the population of Yaoundé consumed vegetables frequently ( 2 to 4 times per week ). Tomato, onion, carrot, and chili pepper were the most preferred exotic vegetables while bitter leaf (>80%) and okra (>70%), were the most preferred traditional vegetables. Attitudes towards vegetables varied according to socio economic and ethnic group. Main constraints to vegetable consumption were preparation time for respondents in the upper class (30%) and social taboos (amaranth is an ominous crop and can cause impotency in men; okra can inhibit the traditional treatment of some diseases) for the middle and lower classes. Freshness, wholesomeness, and color of the fruit or leaves determined the decision to purchase vegetables. Diversification of diet which is good for health , the preference of family members, and taste were the main reasons for consuming vegetables. Taste, degree of sliminess (okra), and smell after cooking were f actors that increased satisfaction during consumption. Two- thirds of the respondents knew the benefits of vegetable consumption but their knowledge was not specific and is influenced by social taboos. Willingness to pay for processed traditional vegetables was higher among respondents in the upper income class (56.9%) than the lower (45.8%) and middle (37.1%) classes. The study revealed a need to further promote the consumption vegetables and inform consumers of their nutritional benefits.
32
Engel, Michael S. "A new species of Thyreus from northern Cameroon (Hymenoptera: Apidae)." Journal of Melittology, no. 42 (December 8, 2014): 1. http://dx.doi.org/10.17161/jom.v0i42.4815.
Full textAbstract:
A new species of the cleptoparasitic bee genus Thyreus Panzer (Apinae: Melectini) is described and figured from two females captured near Garoua in northern Cameroon. Thyreus garouensis Engel, new species, is distinguished from other African Thyreus with pallid pastel blue pubescence. The species is most similar to T. scotaspis (Vachal), but can be distinguished on the basis of its pattern of coloration/pubescence and form of the mesoscutellum.
33
Abange, William Baiye, Celine Nguefeu Nkenfou, Hortense Gonsu Kamga, Clement Assob Nguedia, Nelly Kamgaing, Catherine Lozupone, Samuel Martin Sosso, et al. "Intestinal Parasites Infections among HIV Infected Children Under Antiretrovirals Treatment in Yaounde, Cameroon." Journal of Tropical Pediatrics 66, no. 2 (July 20, 2019): 178–86. http://dx.doi.org/10.1093/tropej/fmz048.
Full textAbstract:
Abstract Background Intestinal parasitic infections are among the most common communicable diseases worldwide, particularly in developing countries. Human immunodeficiency virus (HIV) causes dysregulation of the immune system through the depletion of CD4+ T lymphocytes which gives rise to opportunistic infections. Methodology A cross-sectional study was conducted from January to October 2018. Stool and blood samples were collected from participants aged 1 to 19. Stool samples were analyzed for intestinal parasites. Blood samples were analyzed for HIV and CD4 + T cell counts. Results Out of 214 children enrolled, 119 (55.6%) were HIV infected and 95 (44.4%) were HIV non-infected. All infected children were on antiretroviral treatment (ART). The prevalence of intestinal parasites was 20.2% in HIV infected and 15.8% in non-infected children. Among the 119 HIV infected children, 33 (27.7%) of them had a CD4+ T cell count less than 500 cells/mm3, and amongst them 5.9% had CD4+ T cell count less than 200 cells/mm3. Among HIV infected children, Cryptosporidium spp. was frequently detected, 7/119 (5.9%), followed by Giardia lamblia 5/119 (4.2%) then Blastocystis hominis 3/119 (2.5%) and Entamoeba coli 3/119 (2.5%). Participants on ART and prophylactic co-trimoxazole for >10 years had little or no parasite infestation. Conclusions Although ART treatment in combination with prophylactic co-trimoxazole reduces the risk of parasitic infection, 20.2% of HIV infected children harbored intestinal parasites including Cryptosporidium spp. Stool analysis may be routinely carried out in order to treat detected cases of opportunistic parasites and such improve more on the life quality of HIV infected children.
34
Awoh, Rogers A., Halle G. Ekane, Anastase Dzudie, Egbe O. Thomas, Adebola Adedimeji, and Assob N. Jules. "Implications of the human immunodeficiency virus test and treat strategy on antiretroviral treatment uptake and retention outcomes in Cameroon." International Journal Of Community Medicine And Public Health 6, no. 11 (October 24, 2019): 4716. http://dx.doi.org/10.18203/2394-6040.ijcmph20195045.
Full textAbstract:
Background: Success of the human immunodeficiency virus (HIV) test-and-treat (T&T) strategy requires high antiretroviral (ART) uptake and retention. However, low ART uptake and retention continue to be reported in ART programs. This study assessed ART uptake and retention outcomes of the HIV T&T strategy in three HIV clinics in Cameroon.Methods: A retrospective chart review was done for 423 patients who initiated HIV care within a period of three months prior to the implementation of the HIV T&T strategy, and for another 423 patients who initiated HIV care within a three-month period following the HIV T&T strategy implementation. For each group, sociodemographic, ART uptake and retention data were collected. Chi square and Student T tests were used to test for differences proportions and means between the two groups at p <0.05 and 95% confidence interval.Results: The mean ages (years) in the pre-T&T and the T&T groups were 39.73 and 39.72, and the proportion of female were 65.85% and 65.08% respectively. ART uptake proportion was higher amongst those enrolled under the T&T strategy (98.08% vs 95.39%, p=0.02). A greater proportion of the patients in the T&T group initiated ART within 2 weeks following HIV diagnosis (55.84% vs 48.17%, p=0.03). However, ART retention at 24th month was lower in the T&T group (78.83% vs. 85.79%, p=0.01).Conclusions: The findings suggest that the T&T strategy is associated with higher ART uptake, earlier ART initiation, and lower ART retention. This underscores a need for strategies to improve ART retention under the HIV T&T guidelines.
35
Valliere, Dave. "The comparative state of entrepreneurial intent in Cameroon." Journal of Entrepreneurship in Emerging Economies 7, no. 3 (September 7, 2015): 241–55. http://dx.doi.org/10.1108/jeee-03-2015-0022.
Full textAbstract:
Purpose – This paper aims to report on the level of entrepreneurial intent (EI) in southwestern Cameroon, by developing and using a novel scale that avoids the problems of construct confounds that exist with most EI scales currently in the literature. This scale is also used to measure EI in Canada, as a comparative example of the Western countries typical of previous EI research, to demonstrate the stability of the scale across different cultures. Design/methodology/approach – Data are collected by survey of random participants in Jamaica and Canada. Factor analysis is used to refine the choice of scale elements from this survey. Nested structural equation modelling is then used to confirm the construct validity and to demonstrate construct stability across the two populations. The population scores are then compared by t-test. Findings – A novel ten-item scale is developed and is shown to have a stable factor structure across the two populations. Using this measure, it can be newly seen that, contrary to the expectations for low entrepreneurial prevalence and intention expressed in the literature, there is actually no significant EI deficit in Cameroon. Research limitations/implications – Previous measures of EI in the literature have been seriously confounded by adjacent constructs in the same nomological net, such as beliefs, attitudes and expectations for future behaviours. The research approach taken here demonstrates how these confounds may have led to erroneous conclusions about EI in Cameroon and potentially in other countries. The major limitation of this study is the small sample size, which should be reinforced by replication or extension in future studies. Originality/value – The development of a scale free of construct confounds represents an important step in the refinement of accurate measurement of this foundational construct in entrepreneurship research. This is underscored by the finding that EI in Cameroon may have been misreported in early research due to confounded measurement.
36
Tiokeng, Bertine, Kevine Matane Sob, Roger Tsobou, Benjamine Anguessin, Lacatuce Tene Kenne, Victor François Nguetsop, and Pierre-Marie Mapongmetsem. "Characterization and Carbon Sequestration Potential of Sacred Forests in the Western Highlands Cameroon." Journal of Global Ecology and Environment 19, no. 4 (December 31, 2023): 52–66. http://dx.doi.org/10.56557/jogee/2023/v19i48617.
Full textAbstract:
Cameroon has a diversity of forest ecosystems, including sacred forests that have been preserved until now by traditional laws. The aim of this study was to characterize the vegetation of two sacred forests in the Western Highlands and to estimate the quantities of carbon stored by these forests. The inventories were carried out in 24 quadrats measuring 30 m x 30 m installed in the Bansoa and Baloum forests according to their surface area. Individuals with a diameter of 10 cm or more at breast height (1.30 m from the ground) were measured. Phytodiversity was assessed using the Shannon and Simpson indixes. The quantities of carbon stored by the sacred forests were obtained using allometric equations developed by other researchers and appropriate to the tropical zone. Overall, 50 species in 31 genera and 25 families were recorded. The diversity index values are low. They range from 1.47 to 2.52 bits per plot for the Shannon index, and from 0.70 to 0.91 for the Simpson index. Markhamia lutea and Cola acuminata are the most frequent and abundant species in the study area. The densities of individuals per hectare are 368 individuals/ha at Bansoa and 416 individuals/ha at Baloum and the basal area varies from 32.37 m2/ha to 38.44 m2/ha. The shrub layer dominates in both forests. Of the species recorded, 03 are Vulnerable and 02 are Endangered. Carbon sequestration was 286.84 t C/ha at Baloum and 232.44 t C/ha at Bansoa, with CO2 uptake of 1052.12 t CO2/ha and 853.55 t CO2 /ha respectively. The results of this study show that despite their small size, sacred forests play a significant role in the conservation of plant diversity and also help to reduce greenhouse gases in nature.
37
Ngimanang, Achamoh. "MICROFINANCE SERVICES AND THE GROWTH OF SMALL AND MEDIUM SIZE ENTERPRISES: EVIDENCE FROM THE COMMUNITY CREDIT COMPANY IN THE DOUALA MUNICIPALITY, CAMEROON." International Journal of Business Strategies 5, no. 1 (October 20, 2020): 27–50. http://dx.doi.org/10.47672/ijbs.591.
Full textAbstract:
Purpose: This paper assesses the role of microfinance services on the growth of small and medium size enterprises in Douala, Cameroon.
Methodology: The paper adopts a mixture of Survey Research and a causal research design. Data were collected mainly through likert scaling questionnaires administered effectively to 57 customers of CCC Plc selected at random. Multiple regression analysis and product moment correlation techniques were used with associated statistical tests (Pearsons, student- t, and ANOVA or F tests).
Findings: Considering three business growth enhancing microfinance services: loans, savings and assistance, it was found that loans granted by MFI and Saving service are paramount for the likelihood of SMEs in Cameroon. The effects of saving and loans were positive and highly significant in contributing to the profitability as well as return on assets of the small enterprises. Assistance given by MFIs had positive relation but was not very significant as there are not actually put in place given that Most MFI are profit outfits.
Unique contribution to theory, practice and policy: Important recommendations emanated from the results. One of such proposal is that the cost and conditions of savings and lending by MFIs should be relaxed as an instrumental strategy to foster the growth of SMEs.
Keywords: Microfinance services, growth of SMEs, regression analysis, Cameroon
38
MORLAIS, I., P. GREBAUT, J. M. BODO, S. DJOHA, and G. CUNY. "Characterization of trypanosome infections by polymerase chain reaction (PCR) amplification in wild tsetse flies in Cameroon." Parasitology 116, no. 6 (June 1998): 547–54. http://dx.doi.org/10.1017/s0031182098002625.
Full textAbstract:
The polymerase chain reaction (PCR) method was used to characterize trypanosome infections in tsetse flies from 3 sleeping sickness foci in Cameroon. The predominant tsetse species found was Glossina palpalis palpalis. An average infection rate of 12·1% was revealed by microscopical examination of 888 non-teneral tsetse flies. PCR amplification analyses for trypanosome identification were carried out on 467 flies, with primer sets specific for Trypanosoma (Trypanozoon) brucei s.l., T. (Duttonella) vivax, T. (Nannomonas) simiae and forest type T. (Nannomonas) congolense. Of 467 flies 93 were positive by microscopical analysis while PCR succeeded in identifying 89 positive flies. Of the PCR-positive flies 34 (38·2%) were negative by microscopical examination. PCR amplification, when compared to the parasitological technique, gave a higher estimate of infection rate of trypanosomes in natural tsetse populations. The PCR technique did, however, fail to identify 40·9% (38/93) of the parasitologically positive flies. The reasons for this failure are discussed. The overall prevalence of mixed infections, assessed by PCR, was 37·1%; the majority (72·7%) involved T. brucei and forest type T. congolense.
39
Nerrienet, Eric, Mario L. Santiago, Yacouba Foupouapouognigni, Elizabeth Bailes, Nicolas I. Mundy, Bernadette Njinku, Anfumbom Kfutwah, et al. "Simian Immunodeficiency Virus Infection in Wild-Caught Chimpanzees from Cameroon." Journal of Virology 79, no. 2 (January 15, 2005): 1312–19. http://dx.doi.org/10.1128/jvi.79.2.1312-1319.2005.
Full textAbstract:
ABSTRACT Simian immunodeficiency viruses (SIVcpz) infecting chimpanzees (Pan troglodytes) in west central Africa are the closest relatives to all major variants of human immunodeficiency virus type 1 ([HIV-1]; groups M, N and O), and have thus been implicated as the source of the human infections; however, information concerning the prevalence, geographic distribution, and subspecies association of SIVcpz still remains limited. In this study, we tested 71 wild-caught chimpanzees from Cameroon for evidence of SIVcpz infection. Thirty-nine of these were of the central subspecies (Pan troglodytes troglodytes), and 32 were of the Nigerian subspecies (Pan troglodytes vellerosus), as determined by mitochondrial DNA analysis. Serological analysis determined that one P. t. troglodytes ape (CAM13) harbored serum antibodies that cross-reacted strongly with HIV-1 antigens; all other apes were seronegative. To characterize the newly identified virus, 14 partially overlapping viral fragments were amplified from fecal virion RNA and concatenated to yield a complete SIVcpz genome (9,284 bp). Phylogenetic analyses revealed that SIVcpzCAM13 fell well within the radiation of the SIVcpzPtt group of viruses, as part of a clade including all other SIVcpzPtt strains as well as HIV-1 groups M and N. However, SIVcpzCAM13 clustered most closely with SIVcpzGAB1 from Gabon rather than with SIVcpzCAM3 and SIVcpzCAM5 from Cameroon, indicating the existence of divergent SIVcpzPtt lineages within the same geographic region. These data, together with evidence of recombination among ancestral SIVcpzPtt lineages, indicate long-standing endemic infection of central chimpanzees and reaffirm a west central African origin of HIV-1. Whether P. t. vellerosus apes are naturally infected with SIVcpz requires further study.
40
Nédélec, A., D. Minyem, and P. Barbey. "High-P—high-T anatexis of Archaean tonalitic grey gneisses: the Eseka migmatites, Cameroon." Precambrian Research 62, no. 3 (June 1993): 191–205. http://dx.doi.org/10.1016/0301-9268(93)90021-s.
Full text
41
Nkemnkeng, Francoline Jong, Mendi Grace Anjah, Walter Ndam Tacham, Christiana Ngyete Nyikob Mbogue, Junior Baudoin Wouokoue Taffo, and Victor-François Nguetsop. "Population distribution, conservation status and vulnerability of Ternstroemia cameroonensis Cheek. in the Lebialem Highlands, Cameroon." International Journal of Current Research in Biosciences and Plant Biology 8, no. 2 (February 6, 2021): 1–10. http://dx.doi.org/10.20546/ijcrbp.2021.802.001.
Full textAbstract:
The study was conducted in the Lebialem Highlands with the aim to assess the population distribution, sustainability and conservation status of Ternstroemia cameroonensis in its natural habitat. A total of 25 circular plots of 10 m diameter were established around T. cameroonensis and all species as well as threat to their sustainability evaluated. Data were collected, entered into excel and various percentages calculated while diameter at breast height of T. cameroonensis and three companion species where analysed in STATGRAPHICS XVII.II and the mean separated. The results revealed that T. cameroonensis is found in six localities, mostly between 1500 m to 2500 m above sea level. The three companion species were Aguaria saliciflora, Cyathea camerooniana and Draceana mannii. The most exploitable individuals were at Agocham (64%) while the least at Fossimondi (25%). The highest percentage of dead stems was recorded in Magha (42.85). Among the exploited stems, 33.33% showed a completely dead crown, whereas 10% regular and healthy. The main part of the species exploited w the bark (100%) and in case the stem gets dry it is exploited as fuel wood. T. cameroonensis was shown to be more vulnerable in Montane forests (2.8) than gallery forest (2.6).
42
Isidor, Fuh Suh, and Eric Len Kibinkiri. "Blended Learning and Professional Development of Student-Teachers in the English- Speaking Regions of Cameroon." Journal of Education and Teaching Methods 2, no. 2 (June 12, 2023): 1–19. http://dx.doi.org/10.58425/jetm.v2i2.164.
Full textAbstract:
Aim: This study examined blended learning and the professional development of student-teachers in the two English-speaking regions of Cameroon, within the context of the socio-political crisis and the COVID-19 pandemic.
Methods: The argument for this study anchored on Vygotsky’s Social Constructivism Theory, Tchombe’s Mediated Mutual Reciprocity Theory, Harasim’s Online Collaborative Learning Theory, Garrison’s Self-directed Learning Model, and Pavlov’s Classical Conditioning Theory. A cross-sectional survey research design, with a quantitative approach for data collection was used. A sample of 288 student-teachers, derived using two probability (proportionate stratified and simple random) sampling techniques and one non-probability (purposive) sampling technique, participated in this study. A 39-item self-designed structured blended learning questionnaire for student teachers was used to collect data. The data obtained were analyzed using both descriptive and inferential statistics. The Principal Component Analysis and Ordinary Least Squares Regression Model were used to test the specific null hypotheses.
Results: Findings showed that, teacher-directed learning has a positive but insignificant influence on student-teachers’ professional development (Coef. .0009534; P>t=0.988), distance learning has a negative but significant influence on student-teachers’ professional development (Coef. -.1169*; P>t=0.072), self-directed learning (Coef. .1985***; P>t=0.002 and flipped learning (Coef. .23711***; P>t=0.000) both have a positive and significant influence on student-teachers’ professional development.
Conclusion: The study conclude that blended learning has a significant influence on the professional development of student teachers in the English-speaking regions of Cameroon.
Recommendation: The study recommend that the blended learning strategy with relevant objectives and content be provided in the training of student-teachers, as well as the training of teacher-trainers on the didactics of the blended learning model integrating information and communication technologies.
43
Ngoh Dooh, Jules Patrice, Abdoul Nourou Kone Nsangou, Serge Bertrand Mboussi, Alain Heu, Zaina Todou Amawissa, Dany Brice Tchoupou Tsouala, Paulin Sinama, Eloa Sesseumaga, and Zachee Ambang. "Red rust disease occurring in some fruits species in Cameroon." EUREKA: Life Sciences, no. 5 (November 16, 2022): 3–10. http://dx.doi.org/10.21303/2504-5695.2022.002674.
Full textAbstract:
The knowledge of the red rust disease remains limited in Cameroon, with a view to developing a control method. This work consisted in studying red rust on some fruit species such as Annona muricata (soursop), Dacryodes edulis (safou), Psidium guajava (guava) and Theobroma cacao (cocoa).
Diseased leaves were collected in the field in the Maham site, in west region of Cameroon.The symptomatology of disease (colour, number and diameter of lesions) was studied. Coefficient of variation ( %) was calculated. The incidence and severity of the disease was assessed in the different orchards surveyed. The measurement of the different structures of the thallus (length, width of sporangia and sporangiophores) was carried out using a microscope with a micrometer.
The disease is characterized by circular orange to orange-brown spots on the upper surfaces and rarely on the lower surface. Number of lesions, varied from 245–510 respectively with D. edulis and T cacao. Lesion diameters varied from 0.1−1 cm, 0.1−7 cm, 0.1−1.5 cm in safou (African pear), guava and soursop respectively. The length and width of sporangiophores varied from 280.5−714×10.2−25.5 µm for A. muricata, 408−612×15.3−25.5 µm for Dacryodes edulis, 433.3−663×15.3−20.4 µm for P. guajava and 484.5−612×20.4−35.7 µm for T. cacao. The number of sporangiophores varied from 1 to 11 at the maximum threshold. But, number of sporangia was the same in the four species, 1−9. The pathogenicity test was negative.
The data measurements show that the specie observed is Cephaleurus virescens which is a parasitic alga.
The data obtained are a basis for the development of an integrated control strategy against this emerging disease
44
Ngeve, J. M. "Evaluation of the performance of sweet potato genotypes by joint regression analysis." Journal of Agricultural Science 117, no. 2 (October 1991): 171–76. http://dx.doi.org/10.1017/s0021859600065254.
Full textAbstract:
SUMMARYTwo experiments, each involving a set of six sweet potato clones, the first set developed in sites differing in altitude, and the second in sites differing in soil type, were done at three locations in 4 years in Cameroon. Data obtained were subjected to analyses of variance to determine the presence of genotype × environment (G × E) interactions, and to joint regression analyses to measure the performance of clones across environments. The first experiment produced higher yields and contained more stable clones than the second. In both experiments, mean yields were almost twice as high in 1984 (21·1 t/ha) as in each of the other years (c. 11·0 t/ha), and highest at Nyombe (18·0 t/ha). In Expt 1, the G × E interaction mainly concerned interaction with location, whereas in Expt 2 it concerned interaction with years.Clones 1611 (Expt 1) and 048 (Expt 2) yielded above average and gave linear regressions significantly above unity (b > 1·0) for most traits, indicating specific adaptation to high-yielding environments and hence below average stability. Clones 1112, 1639 and TIbl (Expt I) yielded above average and had regression slopes equal to unity (b = 1·0), indicating average stability and thus general adaptability. Clones TIb2 (Expt 1) and 1487 (Expt 2) produced below average yields (b < 1·0), indicating specific adaptation to low-yielding environments. Since sweet potato is grown mainly for human consumption in Cameroon, a preferred clone must have stable marketable yields. Only clones 1112, TIbl and 1639 could be considered desirable for release to growers.
45
Flisser, Ana, Charles G. Gauci, André Zoli, Joel Martinez-Ocaña, Adriana Garza-Rodriguez, Jose Luis Dominguez-Alpizar, Pablo Maravilla, et al. "Induction of Protection against Porcine Cysticercosis by Vaccination with Recombinant Oncosphere Antigens." Infection and Immunity 72, no. 9 (September 2004): 5292–97. http://dx.doi.org/10.1128/iai.72.9.5292-5297.2004.
Full textAbstract:
ABSTRACT Two recombinant Taenia solium oncosphere antigens, designated TSOL18 and TSOL45-1A, were investigated as vaccines to prevent transmission of the zoonotic disease cysticercosis through pigs. Both antigens were effective in inducing very high levels of protection (up to 100%) in three independent vaccine trials in pigs against experimental challenge infection with T. solium eggs, which were undertaken in Mexico and Cameroon. This is the highest level of protection that has been achieved against T. solium infection in pigs by vaccination with a defined antigen. TSOL18 and TSOL45-1A provide the basis for development of a highly effective practical vaccine that could assist in the control and, potentially, the eradication of human neurocysticercosis.
46
Park, Kyu-Tek. "Six New Species of the Family Lecithoceridae (Lepidoptera) from Ghana." International Journal of Zoology and Animal Biology 6, no. 1 (2023): 1–12. http://dx.doi.org/10.23880/izab-16000438.
Full textAbstract:
The family Lecithoceridae is still one of the poorly known groups in the Afrotropical Region. In Ghana, only eight species of the family have been known so far. In this article, six new species of Lecithoceridae are described from Ghana: four species of the subfamily Lecithocerinae: Lecithocera minutiella Park, sp. nov.; Homaloxestis dallastai Park, sp. nov.; H. nuriana Park, sp. nov., and Pectinimura bongoensis Park, sp. nov.; and two species of the subfamily Torodorinae: Thubdora laticucullusa Park, sp. nov. and T. nubidiella Park, sp. nov. In addition, T. ambliodes Park, 2018 which was described from Cameroon is reported for the first time from Ghana. Images of adults and the genitalia of all known species are provided.
47
Scholte, R., A. Same-Ekobo, R. Slootweg, L. Bont, and A. M. Polderman. "The contribution of existing health facilities to the control of urinary schistosomiasis in northern Cameroon." Acta Tropica 60, no. 2 (October 1995): 109–17. http://dx.doi.org/10.1016/0001-706x(95)00114-t.
Full text
48
Farikou, Oumarou, Gustave Simo, Flobert Njiokou, Ginette Irma Kamé Ngassé, Martin Achiri Fru, and Anne Geiger. "Trypanosome Infections and Anemia in Cattle Returning from Transhumance in Tsetse-Infested Areas of Cameroon." Microorganisms 11, no. 3 (March 9, 2023): 712. http://dx.doi.org/10.3390/microorganisms11030712.
Full textAbstract:
The objective of this work was to assess the anemic status and the use of an immunological test and PCR-based methods to determine the infection rates of trypanosomes species. Transhumance aims to provide cattle with greener pastures and greater water resources than in the Djerem region during the dry season. Two criteria were used to assess the health status of the animals, the prevalence of trypanosomiasis and the level of anemia. In addition, we have evaluated the effectiveness, in trypanosomiasis detection, of the Very Diag Kit (CEVA Santé animale), a Rapid diagnosis test (RDT) based on immunological identification of T. congolense s.l. and T. vivax, responsible for AAT. Four trypanosome species (Trypanosoma congolense savannah type (Tcs), T. congolense forest type (Tcf), T. brucei s.l. (Tbr) and T. vivax (Tvx)) were identified in cattle sampled in four villages. The overall infection rate determined by PCR (68.6%) was much higher than those generally reported in cattle from the Adamawa region (35 to 50%). Infections (including mixed infections) by Tc s.l. (Tcs + Tcf) were predominant (45.7%). The infection rates were also determined using the Very Diag Kit allowing us to identify Tc s.l. and Tvx in the field in less than 20 min. This method provided, for the global infection, a higher rate (76.5%) than that determined by PCR (68.6%), although it is supposed to be less sensitive than PCR. Tc s.l. infection rate (37.8%) was similar to that (38.8%) determined by PCR (Tcs + Tcf single infections). In contrast, the prevalence of Tvx single infections measured by RDT (18%) was nearly two-fold higher than that (9.4%) measured by PCR. Thus, further comparative analyses seem to be needed in order to more accurately assess the sensitivity and specificity of the Very Diag test under our conditions of use on blood samples. The mean PCVs in trypanosome-infected as well as in uninfected cattle were below 25%, the threshold below which an animal is considered anemic. Our study shows that cattle return from transhumance in poor health. It raises questions about its real benefit, especially since the herds are themselves likely to become vectors of trypanosomiasis and possibly of other diseases. At least, effective measures have to be undertaken to treat all cattle coming back from transhumance.
49
TETSOPGANG, Samuel, Masaki ENAMI, and Emmanuel NJONFANG. "Emplacement P-T conditions of Pan-African biotite-amphibole granitoids in the Nkambe area, Cameroon." Journal of Mineralogical and Petrological Sciences 106, no. 6 (2011): 306–19. http://dx.doi.org/10.2465/jmps.110308.
Full text
50
Machuca, A., O. Wood, S. Lee, S. Daniel, M. Rios, N. D. Wolfe, J. K. Carr, et al. "Seroprevalence of Human T Cell Leukemia Virus in HIV Antibody-Negative Populations in Rural Cameroon." Clinical Infectious Diseases 40, no. 11 (June 1, 2005): 1673–76. http://dx.doi.org/10.1086/429910.
Full text