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Relevant bibliographies by topics / Douala (Cameroun) – Plans

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Journal articles

Academic literature on the topic 'Douala (Cameroun) – Plans'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Douala (Cameroun) – Plans"

1

Emmanuel, Mpondo, and Dibong Didier. "Medicinal plant knowledge of ethnic groups in Douala town, Cameroon." American Journal of Food and Nutrition 1, no. 4 (2011): 178–84. http://dx.doi.org/10.5251/ajfn.2011.1.4.178.184.

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2

Emmanuel, Mpondo. "Traditional Knowledge on Medicinal Plants Use by Ethnic Communities in Douala, Cameroon." European Journal of Medicinal Plants 2, no. 2 (2012): 159–76. http://dx.doi.org/10.9734/ejmp/2012/878.

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3

Mbiaké, R., E. Mfoumou, A. Beya Wakata, et al. "Atmospheric Dispersion Modeling of the Emissions from the Logbaba Thermal Power Plant, Douala-Cameroon." Open Journal of Air Pollution 06, no. 04 (2017): 117–34. http://dx.doi.org/10.4236/ojap.2017.64010.

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4

Betti, Jean Lagarde, Pascal Eric Billong Fils, Prisca Toffon, et al. "Quantitative Ethobotany of Gnetum africanum Welw. (Gnetaceae) in Massoumboum, Littoral Region of Cameroon." Journal of Plant Studies 8, no. 2 (2019): 19. http://dx.doi.org/10.5539/jps.v8n2p19.

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Gnetum africanum Welw. is a plant specie of Central and West Africa, a Non Timber Forest Product (NTFP) with high nutritional, medicinal and economic value. In Cameroon, its leaves are recognized by the forestry administration as a special product. Strong demand combined with destructive harvesting techniques has resulted in its rarity in its distribution area. The objective of this work is to characterize the harvesting and trade of G. africanaum, and to assess its abundance (density and structure) in order to appreciate the economic value of the Lehman agroforest system (ALM) based in Massoumboum, a village located at 30 Km of Douala town, the economical capital of Cameroon. An ethnobotanical survey was conducted among harvesters and sellers of G. africanum in the ALM and in adjacent markets. An inventory of G. africanum stems and leaves was carried out at an overall sampling rate of 9.52%. The study revealed that, harvesting of G. africanum is freely done by women, youngers and elders. They start their activity early in the morning and convey their products to markets located in the periphery and inside the city of Douala. The price of the gramme is too high in the periphery than in the city, averaging 0.58 CFA franc. This price is high in the dry season due to the scarcity of other agricultural vegetables. The inventories conducted revealed densities of 6 191 stems/ha and 119&nbsp;548 leaves/ha, with the high density of leaves obtained in less perturbed plots. The combination of field data (forest inventories) with those obtained in the markets (trade data), what we call &laquo;&nbsp;quantitative ethnobotany&nbsp;&raquo;, allowed us to appreciate the temporal economic value (EV) of the ALM. This EV ranges from 500&nbsp;000 - 700&nbsp;000 CFA franc, for an average value of 37 059.9 CFA franc /ha. If well managed, G. africanum can contribute not only to the economy of the women-harvesters, but also to the economy of the ALM. The glaring development challenge of the background of what precedes is the development of non-detriment findings (NDF) for G. africanum in Cameroon. These consist of setting tools which aims to sustain the resource and trade such as the delimitation of Gnetum Allocation Units (GAU), as well as the development and implementation of simple management plans (SMPs).

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5

Fondong, V. N., J. S. Pita, M. E. C. Rey, A. de Kochko, R. N. Beachy, and C. M. Fauquet. "Evidence of synergism between African cassava mosaic virus and a new double-recombinant geminivirus infecting cassava in Cameroon." Microbiology 81, no. 1 (2000): 287–97. http://dx.doi.org/10.1099/0022-1317-81-1-287.

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Stem cuttings were collected in Cameroon from cassava plants displaying cassava mosaic disease (CMD) symptoms. The nature of the viruses present was determined by using the PCR with primers specific for the coat protein (CP) genes of African cassava mosaic virus (ACMV) and East African cassava mosaic virus (EACMV). All samples were infected by ACMV and eight of the 50 samples were infected by both ACMV and an EACMV-like virus. The complete nucleotide sequences of DNA-A and -B of representative ACMV and EACMV-like viruses were determined. The DNA-A component of the EACMV-like virus contained evidence of recombination in the AC2–AC3 region and DNA-B also contained evidence of recombination in BC1. However, both components retained gene arrangements typical of bipartite begomoviruses. When Nicotiana benthamiana plants were doubly inoculated with these Cameroon isolates of ACMV and EACMV (ACMV/CM, EACMV/CM) by using sap from cassava plants or infectious clones, the symptoms were more severe than for plants inoculated with either virus alone. Southern blot analysis of viral DNAs from infected plants showed that there were significantly higher levels of accumulation of both ACMV/CM components and, to a lesser extent, of EACMV/CM components in mixed-infected plants than in singly infected plants. These results strongly suggest the occurrence of a synergistic interaction between the two viruses.

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6

Chellappan, Padmanabhan, Ramachandran Vanitharani, and Claude M. Fauquet. "Short Interfering RNA Accumulation Correlates with Host Recovery in DNA Virus-Infected Hosts, and Gene Silencing Targets Specific Viral Sequences." Journal of Virology 78, no. 14 (2004): 7465–77. http://dx.doi.org/10.1128/jvi.78.14.7465-7477.2004.

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ABSTRACT Viruses are both inducers and targets of posttranscriptional gene silencing (PTGS), a natural defense mechanism in plants. Here we report molecular evidence of the ability of single-stranded DNA (ssDNA) viruses to induce PTGS in infected plants irrespective of the severity of or recovery from the symptoms. Our results reveal that five distinct species of cassava-infecting geminiviruses were capable of triggering PTGS by producing two classes of virus-specific short interfering RNAs (siRNAs) of 21 to 26 nucleotides in two plant hosts, tobacco (Nicotiana benthamiana) and cassava (Manihot esculenta, Crantz). However, the efficacy of virus-induced PTGS varied depending on the intrinsic features of the virus and its interaction with the plant host. We found that symptom recovery over time in plants infected with the isolates of African cassava mosaic virus (ACMV-[CM]) or Sri Lankan cassava mosaic virus was associated with a much higher level of virus-derived siRNA accumulation compared to plants infected with viruses that do not show symptom recovery. Furthermore, we determined that the C terminus of AC1 that overlaps with the N terminus of AC2 early viral genes involved in virus replication were the primary targets for ACMV-[CM]-induced PTGS, whereas the C terminus of BC1 was targeted for the East African cassava mosaic Cameroon virus. In addition, our results reveal the possibility for double-stranded RNA formation during transcription in ssDNA viruses, which explains in part how these viruses can trigger PTGS in plants.

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7

Nicole Liliane, Maffo Maffo, Zapfack Louis, Youmbi Emmanuel, Dibong Siegfried Didier, Ntsomboh-Ntsefong Godswill, and Nanfack Arsel D’Estaing. "Heavy Metal Concentrations in Some Common Medicinal Plants from Different Geographical Locations in Douala, Cameroon." International Journal of Current Research in Biosciences and Plant Biology 3, no. 12 (2016): 10–23. http://dx.doi.org/10.20546/ijcrbp.2016.312.002.

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8

Din, N. "Inventory and Identification of Plants Used in the Treatment of Diabetes in Douala Town (Cameroon)." European Journal of Medicinal Plants 1, no. 3 (2011): 60–73. http://dx.doi.org/10.9734/ejmp/2011/273.

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9

Newbery, D. McC, J. S. Gartlan, D. B. McKey, and P. G. Waterman. "The influence of drainage and soil phosphorus on the vegetation of Douala-Edea Forest Reserve, Cameroun." Vegetatio 65, no. 3 (1986): 149–62. http://dx.doi.org/10.1007/bf00044815.

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10

Chen, Kegui, Behnam Khatabi, and Vincent N. Fondong. "The AC4 Protein of a Cassava Geminivirus Is Required for Virus Infection." Molecular Plant-Microbe Interactions® 32, no. 7 (2019): 865–75. http://dx.doi.org/10.1094/mpmi-12-18-0354-r.

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Geminiviruses (family Geminiviridae) are among the most devastating plant viruses worldwide, causing severe damage in crops of economic and subsistence importance. These viruses have very compact genomes and many of the encoded proteins are multifunctional. Here, we investigated the role of the East African cassava mosaic Cameroon virus (EACMCV) AC4 on virus infectivity in Nicotiana benthamiana. Results showed that plants inoculated with EACMCV containing a knockout mutation in an AC4 open reading frame displayed symptoms 2 to 3 days later than plants inoculated with wild-type virus, and these plants recovered from infection, whereas plants inoculated with the wild-type virus did not. Curiously, when an additional mutation was made in the knockout mutant, the resulting double mutant virus completely failed to cause any apparent symptoms. Interestingly, the role of AC4 on virus infectivity appeared to be dependent on an encoded N-myristoylation motif that mediates cell membrane binding. We previously showed that EACMCV containing the AC4T38I mutant produced virus progeny characterized by second-site mutations and reversion to wild-type virus. These results were confirmed in this study using additional mutations. Together, these results show involvement of EACMCV AC4 in virus infectivity; they also suggest a role for the combined action of mutation and selection, under prevailing environmental conditions, on begomovirus genetic variation and diversity.

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