Log in

Relevant bibliographies by topics / Upper Niger / Journal articles

To see the other types of publications on this topic, follow the link: Upper Niger.

Journal articles on the topic 'Upper Niger'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Upper Niger.'

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

Person, A. K., S. M. Chudgar, B. L. Norton, B. C. Tong, and J. E. Stout. "Aspergillus niger: an unusual cause of invasive pulmonary aspergillosis." Journal of Medical Microbiology 59, no. 7 (July 1, 2010): 834–38. http://dx.doi.org/10.1099/jmm.0.018309-0.

Full text

Abstract:

Infections due to Aspergillus species cause significant morbidity and mortality. Most are attributed to Aspergillus fumigatus, followed by Aspergillus flavus and Aspergillus terreus. Aspergillus niger is a mould that is rarely reported as a cause of pneumonia. A 72-year-old female with chronic obstructive pulmonary disease and temporal arteritis being treated with steroids long term presented with haemoptysis and pleuritic chest pain. Chest radiography revealed areas of heterogeneous consolidation with cavitation in the right upper lobe of the lung. Induced bacterial sputum cultures, and acid-fast smears and cultures were negative. Fungal sputum cultures grew A. niger. The patient clinically improved on a combination therapy of empiric antibacterials and voriconazole, followed by voriconazole monotherapy. After 4 weeks of voriconazole therapy, however, repeat chest computed tomography scanning showed a significant progression of the infection and near-complete necrosis of the right upper lobe of the lung. Serum voriconazole levels were low–normal (1.0 μg ml−1, normal range for the assay 0.5–6.0 μg ml−1). A. niger was again recovered from bronchoalveolar lavage specimens. A right upper lobectomy was performed, and lung tissue cultures grew A. niger. Furthermore, the lung histopathology showed acute and organizing pneumonia, fungal hyphae and oxalate crystallosis, confirming the diagnosis of invasive A. niger infection. A. niger, unlike A. fumigatus and A. flavus, is less commonly considered a cause of invasive aspergillosis (IA). The finding of calcium oxalate crystals in histopathology specimens is classic for A. niger infection and can be helpful in making a diagnosis even in the absence of conidia. Therapeutic drug monitoring may be useful in optimizing the treatment of IA given the wide variations in the oral bioavailability of voriconazole.

APA, Harvard, Vancouver, ISO, and other styles

2

CRESPI, V. "Preliminary study on the fishery resources of the River Niger in the Upper Niger National Park, Guinea." Fisheries Management and Ecology 5, no. 3 (March 1998): 201–8. http://dx.doi.org/10.1046/j.1365-2400.1998.00093.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Thompson, Julian R., Cédric L. R. Laizé, Michael C. Acreman, Andrew Crawley, and Daniel G. Kingston. "Impacts of climate change on environmental flows in West Africa's Upper Niger Basin and the Inner Niger Delta." Hydrology Research 52, no. 4 (July 9, 2021): 958–74. http://dx.doi.org/10.2166/nh.2021.041.

Full text

Abstract:

Abstract Modified water regimes due to climate change are likely to be a major cause of freshwater ecosystem alteration. General Circulation Model (GCM)-related uncertainty in environmental flows at 12 gauging stations in the Upper Niger Basin and flooding within the Inner Niger Delta is assessed using the Ecological Risk due to the Flow Alteration method and a hydrological model forced with projections from 12 GCM groups for RCP 4.5 in the 2050s and 2080s. Risk varies between GCM groups and stations. It increases into the future and is larger for changes in low flows compared to high flows. For the ensemble mean, a small minority of GCM groups projects no risk for high flows in the 2050s (low risk otherwise). This reverses for the 2080s. For low flows, no risk is limited to three stations in the 2050s and one station in the 2080s, the other experience either low or medium risk. There is greater consistency in the risk of change in flood extent, especially in the dry season (medium risk for all groups and the ensemble mean). Some (low or medium) risk of change in peak annual inundation is projected for most groups. Changing flood patterns have implications for wetland ecology and ecosystem services.

APA, Harvard, Vancouver, ISO, and other styles

4

Okoli, Chucks. "The Hydrometeorology of Niger River Basin." Advanced Materials Research 824 (September 2013): 613–29. http://dx.doi.org/10.4028/www.scientific.net/amr.824.613.

Full text

Abstract:

This paper examines the mean annual cycle of rainfall and general circulation features over the Niger River Basin consisting of mainly West Africa and Central Africa regions. Rainfall is examined using a 1400-station archive compiled by earlier workers. Other circulation features are examined using the NCEPNCAR reanalysis dataset. Important features of the reanalysis zonal wind field are shown to compare well with the seasonal evolution described by the radiosonde observations. In addition to the well-known African easterly jet (AEJ) of the Northern Hemisphere, the seasonal evolution of its Southern Hemisphere counterpart is also described. Thermal wind calculations show that although the southern jet is weaker, its existence is also due to a local reversal of the surface temperature gradient. In the upper troposphere, a strong semiannual cycle is shown in the 200-mb easterlies and a feature like the tropical easterly jet (TEJ) is evident south of the equator in January and February. The paper describes the movement of the rainbelt between central and West Africa. An asymmetry in the northward and southward migration of the rainbelt is evident. The paper discusses the influence that the jets may have on rainfall and possible feedback effects of rainfall on the jets. Evidence suggests that the midtropospheric jets influence the development of the rainy season, but also that the rainfall affects the surface temperature gradient and in turn the jets. In the Northern Hemisphere, east of 200E, the axis of the TEJ is located so that it may promote convection by increasing upper-level divergence. However, west of 100E and in the Southern Hemisphere, the location of the TEJ is consistent with the suggestion that it is the equatorward outflow of convection that produces the TEJ. The paper notes that rainfall and river flow is largely influenced by groundwater base flow, and a return to sustained river flow requires replenishment of the aquifers, which is possible only with cumulative raining years. The paper confirms that there is correlation between the decrease in rainfall and low river flows.

APA, Harvard, Vancouver, ISO, and other styles

5

Gervais, Raymond R. "Archival Documents on Upper Volta: Here, There, and Everywhere." History in Africa 20 (1993): 379–84. http://dx.doi.org/10.2307/3171983.

Full text

Abstract:

Fluctuations of colonial policies toward territorial integrity were not without effects, first on the people of these colonies and then on the organization of their own administration. A case in point is the tortuous history of colonial administration in Upper Volta (now Burkina Faso). Created in 1919 out of the oversized Haut-Sénégal-Niger—which extended from the Sénégal river to lake Chad—in order to rationalize the administration Upper Volta survived as an autonomous colony until January 1933, when it was officially dismembered. The northwestern part (i.e., Ouahigouya) was ceded to the French Sudan, the central and southwestern regions (Mosi and Bobo) to Côte d'Ivoire, and a small portion of the eastern portion (Fada N'Gourma) to Niger. After harsh negotiations the colony of Upper Volta was recreated in 1947. Researchers who have worked on this part of the French empire know that every adjustment brought to the administrative arrangement also caused personnel and documents to be displaced to the new centers—Abidjan, Niamey, or Bamako.This institutional constraint on the organization of complete sets of archival documents for the study of the region's past has been strengthened by a well-known post-independence symptom: bureaucratic plethora. Indeed Burkina Faso is probably the only country in the world to possess more archivists than organized archives. The Direction des archives, with its dozen archivists in the 1980s, had not produced a single inventory of what could be found in the capital (Ouagadougou) or in the regions, although important work had been done by individual archivists appointed to specific Ministries or by expatriate researchers.

APA, Harvard, Vancouver, ISO, and other styles

6

Liu, Bang, Guangya Zhang, Fengjun Mao, Jiguo Liu, and Mingsheng Lü. "GEOCHEMISTRY AND ORIGIN OF UPPER CRETACEOUS OILS FROM THE TERMIT BASIN, NIGER." Journal of Petroleum Geology 40, no. 2 (March 17, 2017): 195–207. http://dx.doi.org/10.1111/jpg.12672.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Thompson, Julian R., Andrew Crawley, and Daniel G. Kingston. "Future river flows and flood extent in the Upper Niger and Inner Niger Delta: GCM-related uncertainty using the CMIP5 ensemble." Hydrological Sciences Journal 62, no. 14 (October 12, 2017): 2239–65. http://dx.doi.org/10.1080/02626667.2017.1383608.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Bang, Lunkun Wan, Fengjun Mao, Jiguo Liu, Mingsheng Lü, and Yuhua Wang. "HYDROCARBON POTENTIAL OF UPPER CRETACEOUS MARINE SOURCE ROCKS IN THE TERMIT BASIN, NIGER." Journal of Petroleum Geology 38, no. 2 (March 20, 2015): 157–75. http://dx.doi.org/10.1111/jpg.12604.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Iten, Heyo Van, Moussa Konate, and Yahaya Moussa. "Conulariids of the Upper Talak Formation (Mississippian, Visean) of northern Niger (West Africa)." Journal of Paleontology 82, no. 1 (January 2008): 192–96. http://dx.doi.org/10.1666/06-083.1.

Full text

Abstract:

Conulariids of West Africa have received relatively little detailed attention in the literature on this widespread extinct group of marine cnidarians. Recently, however, Babcock et al. (1995) described two new species, Paraconularia feldmanni and P. sahara, from the upper part of the Mississippian (Visean) Talak Shale Formation in the Tim Mersoi Basin of northern Niger. This was the first report of the genus Paraconularia Sinclair, 1940 from Africa as well as the first assignment of Carboniferous conulariids from that continent to the species level. Since then two of the present authors have collected 24 additional conulariid specimens from the Talak Formation in the same area that yielded the two specimens described by Babcock et al. (1995). Like the previously described material, most of the new specimens, described below, have been worn or weathered to such an extent that it is difficult to identify them to the species level. In some cases, moreover, identification to the genus level is problematical, but this may ultimately be due to the fact that currently recognized conulariid genera (e.g., Moore and Harrington, 1956b) have been defined phenetically, rather than on the basis of prior analysis of the phylogenetic relationships among conulariid species. This means that at least some currently recognized conulariid genera may have been defined by similarities that are primitive or analogous.

APA, Harvard, Vancouver, ISO, and other styles

10

Munier, S., A. Polebistki, C. Brown, G. Belaud, and D. P. Lettenmaier. "SWOT data assimilation for operational reservoir management on the upper Niger River Basin." Water Resources Research 51, no. 1 (January 2015): 554–75. http://dx.doi.org/10.1002/2014wr016157.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Arimoro, Francis O., and Robert B. Ikomi. "Ecological integrity of upper Warri River, Niger Delta using aquatic insects as bioindicators." Ecological Indicators 9, no. 3 (May 2009): 455–61. http://dx.doi.org/10.1016/j.ecolind.2008.06.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

de la Croix, Kévin. "Social and migratory impacts of collective seine fishing on the upper Niger River." African Identities 19, no. 3 (July 3, 2021): 304–21. http://dx.doi.org/10.1080/14725843.2021.1938509.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Akana, Tombra, and Olubunmi Adeigbe. "Channel characteristics and planform dynamics of the lower Niger River, Niger Delta Basin (1985–2015)." Geology, Geophysics and Environment 45, no. 4 (January 25, 2020): 291. http://dx.doi.org/10.7494/geol.2019.45.4.291.

Full text

Abstract:

This study used repeat satellite imagery and Geographic Information System analysis to assess the plan-form dynamics along the length of the lower Niger River Valley from Onitsha city to the coast between 1985 and 2015. The aim is to understand the altered dynamics and its plausible causes in this data-poor region. Analyses revealed that the Niger River has undergone change corresponding to enhanced instability in terms of an increased rate of erosion. In the study area, a change was observed from 3.7% of deposition in the first 10 years (1985–1995) to 3.9% of erosion in the next 10 years (1995–2005) and 4.7% of erosion in the last 10 years (2005–2015). Total erosion over the 30-year period (1985–2015) in the delta was calculated on 4.8%. The river channel has migrated toward the east in the upper and lower reaches while the mid-section of the channel is migrating towards the west. The east river bank is observed to be more unstable compared to west bank line through the study period. The maximum shifts identified were 3.35 km of deposition in 10 years (1985–1995), 3.31 km of erosion in the next 10 years (1995–2005), and another substantial erosional shift of 3.35 km in the next 10 years (2005–2015). Avulsion rates gradually moved from −42.1 m ∙ year−1 (1985–2005, segment F) to 100.2 m ∙ year−1 (1985–1995, segment D), large deposition in the first 10 years. Total avulsion rates of the delta in the last 30 years (1985–2015) has pointed on erosion (−2.2 m ∙ year−1). The altered dynamics observed would likely threaten the future of the frag-ile lower river system environment and raise concerns for operators with infrastructure within the Niger Delta.

APA, Harvard, Vancouver, ISO, and other styles

14

George, Awoteinm Dateme Isaiah, and Jasper Freeborn Nestor Abowei. "The Recruitment Pattern of Liza falcipinnis from Elechi Creek, Upper Bonny, Niger Delta, Nigeria." OALib 05, no. 04 (2018): 1–11. http://dx.doi.org/10.4236/oalib.1104457.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Ali, Moumouni, Ibrahim Wagani, and Mohammed S. Chaanda. "Geochemistry and Mineralogy of the Upper Cretaceous-Paleocene Marine Series, Iullemmeden Basin, Niger Republic." Journal of Geoscience and Environment Protection 07, no. 12 (2019): 1–19. http://dx.doi.org/10.4236/gep.2019.712001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Lingham-Soliar, Theagarten. "A new mosasaurPluridens walkerifrom the Upper Cretaceous, Maastrichtian of the Iullemmeden Basin, southwest Niger." Journal of Vertebrate Paleontology 18, no. 4 (December 28, 1998): 709–17. http://dx.doi.org/10.1080/02724634.1998.10011100.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Damiani, ROss, Christian A. Sidor, J. Sébastien Steyer, Roger M. H. Smith, Hans C. E. Larsson, Abdoulaye Maga, and Oumarou Ide. "The vertebrate fauna of the Upper Permian of Niger. V. The primitive temnospondylSaharastega moradiensis." Journal of Vertebrate Paleontology 26, no. 3 (September 11, 2006): 559–72. http://dx.doi.org/10.1080/02724634.2006.10010015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Uehara, Satiko, Marcia Regina Franzolin, Flávio César Viani, Soledad Chiesa, Aricelma Pinheiro França, and Claudete Rodrigues Paula. "Activity of Tri-N-Butyl Tin maleate in carpets against Staphylococcus aureus and Aspergillus niger, verified through two methodologies: Inhibition Halo (HZ) and Inhibition Surface (Print)." Revista do Instituto de Medicina Tropical de São Paulo 50, no. 3 (June 2008): 191–94. http://dx.doi.org/10.1590/s0036-46652008000300011.

Full text

Abstract:

The aim of the present study was to verify the activity of the Tri-N-Butyl Tin maleate compound against Staphylococcus aureus and Aspergillus niger, after its industrial application in 40 samples of carpets of different materials (polypropylene, polyester, polyamide and wool). The qualitative assays were performed through two methodologies: Inhibition Halo (HZ) and Inhibition of Surface (Print). The carpet with the product inhibited 100% of bacterial (Staphylococcus aureus) and fungi (Aspergillus niger) growth, under the conditions of this study. The microbial inhibition was higher in upper portion of carpets. The methodologies employed appear to be adequate to test the bactericide and fungicide activities of the Tri-N-Butyl Tin maleate. The print methodology confirmed the results obtained by the inhibition zone assay. Further studies using the same methodologies are needed to confirm our results.

APA, Harvard, Vancouver, ISO, and other styles

19

Tobih, Francis. "Occurrence and seasonal variation of heteroligus meles billb (Coleoptera: Dynastidae) in upper Niger Delta, Nigeria." Agriculture and Biology Journal of North America 2, no. 5 (May 2011): 826–31. http://dx.doi.org/10.5251/abjna.2011.2.5.826.831.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Tobih, F. O. "Occurrence and Seasonal Variation of Heteroligus Meles Billb (Coleoptera: Dynastidae) in Upper Niger Delta, Nigeria." Agricultural Journal 6, no. 3 (March 1, 2011): 106–9. http://dx.doi.org/10.3923/aj.2011.106.109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Oden, Michael I., and Emmanuel M. Iroka. "Numerical Dynamic Analysis of the Upper Miocene in the Niger Delta Basin from 3d Seismics." Journal of Geography, Environment and Earth Science International 17, no. 4 (October 25, 2018): 1–19. http://dx.doi.org/10.9734/jgeesi/2018/39458.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

E.I, Seiyaboh,. "Impact of Dredging on the Fisheries of Igbedi Creek, Upper Nun River, Niger Delta, Nigeria." IOSR Journal Of Environmental Science, Toxicology And Food Technology 7, no. 5 (2013): 38–44. http://dx.doi.org/10.9790/2402-0753844.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Ziegler, Stefan, Gerhard Nikolaus, and Rainer Hutterer. "High mammalian diversity in the newly established National Park of Upper Niger, Republic of Guinea." Oryx 36, no. 1 (January 2002): 73–80. http://dx.doi.org/10.1017/s003060530200011x.

Full text

Abstract:

This paper presents the results of a mammal survey conducted between 1995 and 1997 in the newly established National Park of Upper Niger in the Republic of Guinea, West Africa. Ninety-four species of mammals were recorded in the park area and its environs; 19 of these species were newly recorded or confirmed for Guinea. The fauna of the park includes about 50% of the known mammalian diversity of the country. Among the species found are West African endemics such as the Gambian mongoose Mungos gambianus. The park, although situated in the Guinea savannah belt, includes some remnant forest, which harbours tropical forest mammals such as Thomas's galago Galagoides cf. thomasi, hump-nosed mouse Hybomys planifrons, soft-furred rat Praomys rostratus and flying squirrel Anomalurops sp.. This National Park is a high priority area for the conservation of the vertebrate diversity of West Africa.

APA, Harvard, Vancouver, ISO, and other styles

24

Gayet, Mireille, François J. Meunier, and Christa Werner. "Strange polypteriformes from the Upper Cretaceous of In Becetem (Niger) and Wadi Milk Formation (Sudan)." Geobios 30 (January 1997): 249–55. http://dx.doi.org/10.1016/s0016-6995(97)80030-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Okiemute, Tobih Francis. "Occurrence and Seasonal Variation of Heteroligus meles Billb (Coleoptera: Dynastidae) in Upper Niger Delta, Nigeria." Environmental Research Journal 5, no. 3 (March 1, 2011): 136–39. http://dx.doi.org/10.3923/erj.2011.136.139.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Oluwasegun, Adebayo H. "Flood risk and vulnerability mapping of settlements within upper and lower Niger river basin, Nigeria." Ethiopian Journal of Environmental Studies and Management 9, no. 1 (January 12, 2017): 815. http://dx.doi.org/10.4314/ejesm.v9i1.2s.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Sproson, Eleanor L., Kelly M. Thomas, Laurie C. Lau, Philip G. Harries, Peter H. Howarth, and Rami J. Salib. "Common airborne fungi induce species-specific effects on upper airway inflammatory and remodelling responses." Rhinology journal 54, no. 1 (March 1, 2016): 51–55. http://dx.doi.org/10.4193/rhino14.278.

Full text

Abstract:

Objective: Whilst the exact cause of chronic rhinosinusitis (CRS) remains elusive, it is clear that both inflammation and remodelling are key disease processes. Environmental fungi have been linked to airway inflammation in CRS; however, their role in the pathogenesis of this condition remains controversial. The current consensus suggests that whilst fungi may not be directly causative, it is likely that CRS patients have deficits in their innate and potentially acquired immunity, which in turn may modify their ability to react to fungi. This study used a nasal polyp explant tissue stimulation model to study the inflammatory and remodelling responses related to challenge with common airborne fungal species. Methods: Ex vivo nasal polyp tissue from six well phenotyped CRSwNP patients undergoing functional endoscopic sinus surgery was stimulated with 1, 10 and 100 μg/ml of Alternaria alternata, Aspergillus niger, Cladosporium sphaerospermum and Penicillium notatum and compared with unchallenged polyp tissue as control. Enzyme-linked immunosorbent assay (ELISA) was used to measure the levels of pro-inflammatory cytokines interleukin-6 (IL-6), granulocyte macrophage colony stimulating factor (GM-CSF) and tumour necrosis factor-α (TNF-α); and pro-remodelling cytokines transforming growth factor-b1 (TGF-b1), and basic fibroblast growth factor (bFGF) in the polyp supernatant. Results: Aspergillus niger stimulation increased pro-inflammatory cytokines TNF-α, GM-CSF and IL-6 whilst having little effect on the remodelling cytokines bFGF and TGF-b1. In contrast, stimulation with Cladosporium sphaerospermum, Alternaria alternata and Penicillium notatum reduced pro-inflammatory cytokines TNF-α and IL-6, but induced a dose-dependent increase in remodelling cytokines TGF-b1 and bFGF. Conclusions: This study shows that common airborne fungi induce species-specific effects on the upper airway inflammatory and remodelling responses. These findings provide further immunological evidence of a disease-modifying role for fungi in CRS.

APA, Harvard, Vancouver, ISO, and other styles

28

FUJIKAWA, HIROSHI, SATOSHI MOROZUMI, GLEN H. SMERAGE, and ARTHUR A. TEIXEIRA. "Comparison of Capillary and Test Tube Procedures for Analysis of Thermal Inactivation Kinetics of Mold Spores." Journal of Food Protection 63, no. 10 (October 1, 2000): 1404–9. http://dx.doi.org/10.4315/0362-028x-63.10.1404.

Full text

Abstract:

Characteristics of capillary and test tube procedures for thermal inactivation kinetic analysis of microbial cells were studied for mold spores. During heating, capillaries were submerged in a water bath and test tubes were held with their caps positioned above the level of the heating medium. Thermal inactivation curves of Aspergillus niger spores in capillaries at around 60°C consisted of a shoulder and a fast linear decline, whereas curves in test tubes consisted of a shoulder, a fast linear decline, and a horizontal tail. There were no significant differences in values of the rate and the delay of fast declines in curves between the procedures. Some experiments were done to clarify the cause for tailing with test tubes. There were no tails with test tubes whose inner walls were not contaminated by A. niger spores, suggesting that tails arise from A. niger spores contaminating the inner walls of test tubes. Temperature of the inner wall at the level of a heating medium was lower than that of the medium. Further, there were no tails for test tubes submerged in the heating medium. These results showed that the reason for survival of contaminants on the upper wall of test tubes was that cells were not subjected to sufficient inactivation temperature. Finally, thermal inactivation curves of A. niger spores in capillaries at various constant temperatures were studied. Curves consisted of a shoulder and a fast linear decline at 57°C and above, whereas curves at below 57°C consisted of a shoulder, a fast linear decline, and a sloping tail.

APA, Harvard, Vancouver, ISO, and other styles

29

Portis-Winner, Irene. "Jean Rouch: The semiotics of ethnographic film." Sign Systems Studies 41, no. 2/3 (November 7, 2013): 230–40. http://dx.doi.org/10.12697/sss.2013.41.2-3.06.

Full text

Abstract:

Jean Rouch (1917–2004) is considered to be the greatest ethnographic filmmaker in the world. His films, which focus primarily on the Songhay of the Upper Niger in Africa, have fundamentally changed the spirit, goals, and methods of ethnographic filmmaking. I ask how Rouch established contact with those he filmed, how his invented semio-ethnic terms and his understanding of twoness and the other informed his practice, and in what sense his films were “shared anthropology” (his term).

APA, Harvard, Vancouver, ISO, and other styles

30

A.D., Achimota, Joseph O.T., Payou T.O., Cameroon O.P., and Williams P.A. "Spatial Variability of Selected Soil Properties of the Lower Niger River Floodplains in Bayelsa State, Nigeria." African Journal of Agriculture and Food Science 4, no. 3 (July 20, 2021): 14–27. http://dx.doi.org/10.52589/ajafs-6rmaxnlv.

Full text

Abstract:

Owing to the influence of topography on soil properties, studies on the variability of soil properties become imperative. This study assessed spatial variability of some selected soil properties in three physiographic units: upper slope, lower slope and recent alluvial soils on channels of present active river in two locations in Bayelsa State. In each unit, one representative soil profile was dug, soil samples collected from generic horizons and analyzed. The results showed varying degree of spatial variability in physical and chemical characteristics, flooding, the source of parent materials and degree of hydromorphism; being the major determining factors. Among the soil separates, clay was highly variable in two physiographic units while sand and silt showed moderate variability. Organic C was moderately to highly variable (CV=20.13 – 112.77%), while total N (36.53 – 90.01%) and available P (41.49 – 58.71%) were highly variable in all the mapping units. Calcium was moderately variable (CV=26.85%) in the upper slope, and highly variable in the middle slope (CV=43.17%) and moderately variable (CV=28.93%) in recent alluvial soils in the channel of the present active river of Elemebiri and in Trofani soils; low (CV=10.01%) in the upper slope, highly variable (CV=41.33%) in the middle slope and moderately variable (CV=22.08%) recent alluvial soils in the channel of the present active river while Mg (CV=66.79 – 80.29%) and K (CV=39.27 – 101.53%) were highly variable in the different physiographic units of the two locations. Flooding, wetness and soil fertility are major constraints to agricultural intensification that requires attention.

APA, Harvard, Vancouver, ISO, and other styles

31

FengJun, MAO, LIU Bang, LIU JiGuo, JIANG Hong, YUAN ShengQiang, ZHENG FengYun, LI ZaoHong, and WANG YuHua. "The reservoir characteristics and controlling factors of the Upper Cretaceous sandstones in the Termit Basin, Niger." Acta Petrologica Sinica 35, no. 4 (2019): 1257–68. http://dx.doi.org/10.18654/1000-0569/2019.04.18.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

E.I, Seiyaboh,. "Impact of Dredging on the Water Quality of Igbedi Creek, Upper Nun River, Niger Delta, Nigeria." IOSR Journal Of Environmental Science, Toxicology And Food Technology 7, no. 5 (2013): 51–56. http://dx.doi.org/10.9790/2402-0755156.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Davies, Onome Augustina, and Obih Alex Ugwumba. "Effects of Tide on Zooplankton Community of a Tributary of Upper Bonny Estuary, Niger Delta, Nigeria." International Journal of Scientific Research in Knowledge 1, no. 9 (September 1, 2013): 325–42. http://dx.doi.org/10.12983/ijsrk-2013-p325-342.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Smiley, Tara M., Christian A. Sidor, Abdoulaye Maga, and Oumarou Ide. "The vertebrate fauna of the Upper Permian of Niger. VI. First evidence of a gorgonopsian therapsid." Journal of Vertebrate Paleontology 28, no. 2 (June 12, 2008): 543–47. http://dx.doi.org/10.1671/0272-4634(2008)28[543:tvfotu]2.0.co;2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Mathey, Bernard, Kadi Alzouma, Jacques Lang, Christian Meister, Didier Néraudeau, and André Pascal. "Unusual faunal associations during Upper Cenomanian-Lower Turonian floodings on the Niger ramp (central West Africa)." Palaeogeography, Palaeoclimatology, Palaeoecology 119, no. 1-2 (December 1995): 63–75. http://dx.doi.org/10.1016/0031-0182(95)00060-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Moslen, Miebaka, and Erema R. Daka. "Attributes of the Subtidal Macrobenthos of Azuabie Creek in the upper Bonny Estuary, Niger Delta, Nigeria." Research Journal of Environmental and Earth Sciences 6, no. 3 (March 20, 2014): 143–55. http://dx.doi.org/10.19026/rjees.6.5753.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Vetter, T., S. Huang, V. Aich, T. Yang, X. Wang, V. Krysanova, and F. Hattermann. "Multi-model climate impact assessment and intercomparison for three large-scale river basins on three continents." Earth System Dynamics Discussions 5, no. 2 (July 4, 2014): 849–900. http://dx.doi.org/10.5194/esdd-5-849-2014.

Full text

Abstract:

Abstract. Climate change impacts on hydrological processes should be simulated for river basins using validated models and multiple climate scenarios in order to provide reliable results for stakeholders. In the last 10–15 years climate impact assessment was performed for many river basins worldwide using different climate scenarios and models. Nevertheless, the results are hardly comparable and do not allow to create a full picture of impacts and uncertainties. Therefore, a systematic intercomparison of impacts is suggested, which should be done for representative regions using state-of-the-art models. Our study is intended as a step in this direction. The impact assessment presented here was performed for three river basins on three continents: Rhine in Europe, Upper Niger in Africa and Upper Yellow in Asia. For that, climate scenarios from five GCMs and three hydrological models: HBV, SWIM and VIC, were used. Four "Representative Concentration Pathways" (RCPs) covering a range of emissions and land-use change projections were included. The objectives were to analyze and compare climate impacts on future trends considering three runoff quantiles: Q90, Q50 and Q10 and on seasonal water discharge, and to evaluate uncertainties from different sources. The results allow drawing some robust conclusions, but uncertainties are large and shared differently between sources in the studied basins. The robust results in terms of trend direction and slope and changes in seasonal dynamics could be found for the Rhine basin regardless which hydrological model or forcing GCM is used. For the Niger River scenarios from climate models are the largest uncertainty source, providing large discrepancies in precipitation, and therefore clear projections are difficult to do. For the Upper Yellow basin, both the hydrological models and climate models contribute to uncertainty in the impacts, though an increase in high flows in future is a robust outcome assured by all three hydrological models.

APA, Harvard, Vancouver, ISO, and other styles

38

Dutra, E., F. Di Giuseppe, F. Wetterhall, and F. Pappenberger. "Seasonal forecasts of drought indices in African basins." Hydrology and Earth System Sciences Discussions 9, no. 9 (September 28, 2012): 11093–129. http://dx.doi.org/10.5194/hessd-9-11093-2012.

Full text

Abstract:

Abstract. Vast parts of Africa rely on the rainy season for livestock and agriculture. Droughts can have a severe impact in these areas which often have a very low resilience and limited capabilities to mitigate their effects. This paper tries to assess the predictive capabilities of an integrated drought monitoring and forecasting system based on the Standard precipitation index (SPI). The system is firstly constructed by temporally extending near real-time precipitation fields (ECMWF ERA-Interim reanalysis and the Climate Anomaly Monitoring System-Outgoing Longwave Radiation Precipitation Index, CAMS-OPI) with forecasted fields as provided by the ECMWF seasonal forecasting system and then is evaluated over four basins in Africa: the Blue Nile, Limpopo, Upper Niger, and Upper Zambezi. There are significant differences in the quality of the precipitation between the datasets depending on the catchments, and a general statement regarding the best product is difficult to make. All the datasets show similar patterns in the South and North West Africa, while there is a low correlation in the tropical region which makes it difficult to define ground truth and choose an adequate product for monitoring. The Seasonal forecasts have a higher reliability and skill in the Blue Nile, Limpopo and Upper Niger in comparison with the Zambezi. This skill and reliability depends strongly on the SPI time-scale, and more skill is observed at larger time-scales. The ECMWF seasonal forecasts have predictive skill which is higher than using climatology for most regions. In regions where no reliable near real-time data is available, the seasonal forecast can be used for monitoring (first month of forecast). Furthermore, poor quality precipitation monitoring products can reduce the potential skill of SPI seasonal forecasts in two to four months lead time.

APA, Harvard, Vancouver, ISO, and other styles

39

Harmon, Stephen A. "The Malian National Archives at Kuluba: Access and Applicability." History in Africa 19 (1992): 441–44. http://dx.doi.org/10.2307/3172012.

Full text

Abstract:

The Malian National Archives are located at Kuluba, an administrative suburb of Bamako. The collection is remarkable because of its vast scope. While for the post-independence period only materials from the Republic of Mali are included, for the colonial period the collection includes documents from what was then called the French Sudan, of which Bamako was the capital. At various times the French Sudan comprised, besides all of modern Mali, portions of Mauritania, all of Burkina Faso, and for brief periods portions of Senegal, Guinea, Ivory Coast, and Benin. In addition, documents from the military department of Niger (now Republic of Niger) also came into Kuluba.Among the documents one might not expect to find at Kuluba is a collection from the southeastern portions of Mauritania, including territory that at one time formed parts of the cercles of Kayes, Nioro, and Timbuktu, as well as the entire cercle of Nema. These districts, comprising the modern Mauritanian centers of Walata, Timbedra, and Aiun el-Arms, an area of nearly 300,000 square kilometers, were removed from the Sudan and appended to Mauritania in 1945. Many documents from what is today the nation of Burkina Faso are also found at Kuluba. All of what was later to be called Upper Volta was part of the Sudan until 1914, when it was made a separate colony. In 1932 the cercles of Wahiguya and Tugan were reattached to the Sudan, and again removed in 1947 when Upper Volta was reconstituted.

APA, Harvard, Vancouver, ISO, and other styles

40

Saito, Koshi. "Potential Competency of Glucose Oxidase for Modification of Flower Colour in Carthamus tinctorius." Zeitschrift für Naturforschung C 47, no. 3-4 (April 1, 1992): 205–8. http://dx.doi.org/10.1515/znc-1992-3-407.

Full text

Abstract:

Abstract Glucose was found to be a potential stimulator of carthamin formation in triturated florets of C. tinctorius. At a 10 mM glucose level, carthamin-producing activity was raised from 3.2- fold (upper) to 2.0-fold (lower) level compared with the control having no sugar. Glucose oxidase (β-D-glucose: oxygen 1-oxidoreductase, EC 1.1.3.4) from Aspergillus niger could catalyze the conversion of precarthamin to carthamin, indicative of flower colour modification in C. tinctorius. For optimum reaction, precarthamin, β-D-glucose, and oxygen were required. No manganese enhanced the catalytic enzyme process.

APA, Harvard, Vancouver, ISO, and other styles

41

Seidou, Ousmane, Fatoumata Maiga, Claudia Ringler, Spela Kalcic, and Luca Ferrini. "Challenges and Opportunities in the Operationalization of the Water-Environment-Energy-Food (WE2F) Nexus: Case Study of the Upper Niger Basin and Inner Niger Delta, West Africa." E3S Web of Conferences 183 (2020): 02001. http://dx.doi.org/10.1051/e3sconf/202018302001.

Full text

Abstract:

The ever-increasing demand for water, food, and energy is putting unsustainable pressure on natural resources worldwide, often leading to environmental degradation that, in turn, affect water, food, and energy security. The recognition of the complex interlinkages between multiple sectors has led to the creation of various holistic approaches to environmental decision making such as Integrated Natural Resources Management (INRM), Integrated Water Resources Management (IWRM), Virtual Water (VW), Water Footprint (WF) and lately the Food-EnergyEnvironment-Water nexus (WE2F). All these approaches aim to increase resource use efficiency and promote sustainability by increasing the cooperation between traditionally disjoint sectors, and mainly differ by the number and relative weights of the sectors included in their framework. They also suffer from the same face and the same barriers for implementation, some of which may never be fully overcome. The paper discusses the benefits of adopting a WE2F nexus approach in the Upper Niger Basin (UNB) and the Inner Niger Delta (IND), but also the multiple difficulties associated with its practical implementation. IWRM/WE2F initiatives in the UNB/IND such as the BAMGIRE project piloted by Wetlands International and funded by the Dutch Embassy in Mali to secure livelihoods and biodiversity in a changing environment, is taken as an example of partial success in the use of a nexus approach to watershed management. It was shown there are multiple barriers to the operational implementation of the WE2F. However, while a full understanding of all interlinkage between sectors may never be possible, data collection, scientific research and model development can improve our ability to understand the complex system in which we live, and hence take better decisions

APA, Harvard, Vancouver, ISO, and other styles

42

Abudu, Emmanuel K., Ivy N. Umanah, Memphin D. Ekpo, Emmanuel B. Etuk, Ifeanyi A. Onwuezobe, and Agility Obi-Ihesie. "A giant ectopic hidradenoma papilliferum in a Niger delta region of Nigeria." Rare Tumors 3, no. 4 (November 1, 2011): 155–57. http://dx.doi.org/10.4081/rt.2011.e50.

Full text

Abstract:

Hidradenoma papilliferum is a known example of adnexal skin tumours with apocrine differentiation. It is a rare benign tumour which tends to arise from areas with rich concentration of aporine glands such as anogenital region, vulval, perineal, axillae, and periumbilical areas. In this report, the tumour was found in the upper outer quadrant of left breast, being one of the ectopic sites for this tumour. Contrary to most reports where male preponderance was popular for ectopic hidradenoma papilliferum, the patient in this report is a 71-year-old female. Considering the location of this tumour in this report, the likely histopathological differential diagnoses such as tubular apocrine adenoma, clear cell (apocrine) adenoma, lipoma, intraductal papilloma and papillary carcinoma of the breast should be considered for exclusion. This is the first reported case of a giant ectopic hidradenoma papilliferum of the breast in a Niger Delta region of Nigeria which also highlights the role of fine needle aspiration and cytology in the diagnosis of breast lesions.

APA, Harvard, Vancouver, ISO, and other styles

43

A. Olatunji, Olubusayo, Edward A. Okosun, Usman S. Onoduku, and Yahya B. Alkali. "Lithological attributes of hd-001 well, shallow offshore, Niger delta basin, Nigeria." International Journal of Advanced Geosciences 9, no. 1 (December 25, 2020): 5. http://dx.doi.org/10.14419/ijag.v9i1.31226.

Full text

Abstract:

Lithological analysis was carried out on 96 ditch cuttings samples from HD-001 well located within the shallow offshore Niger delta basin, Nigeria. Three lithofacies sequences were delineated by the integration of wireline logs textural/lithologic attritudes and the distribution of index accessory minerals. They are transitional paralic, paralic and marine paralic sequences. The lithologic, textural and wireline log data indicate that the entire interval studied in the HD-001 well belongs to the Agbada Formation. The Formation is made up of alternating sand and shale units which suggests rapid shoreline progradation. The grain size increases from essentially fine to medium-grained at the basal part of the well to dominantly coarser grain at the upper part. The index accessories recognize shallow marine to coastal deltaic settings environment of deposition. Sand bodies which represent sub-environments within those settings are deposited in sequences. Each sequence begins with a transgressive phase followed by significant regressions.

APA, Harvard, Vancouver, ISO, and other styles

44

Uzukwu, P. U., T. G. Leton, and N. A. Jamabo. "Survey of the Physical Characteristics of the Upper Reach of the New Calaber River, Niger Delta, Nigeria." Trends in Applied Sciences Research 9, no. 9 (September 1, 2014): 494–502. http://dx.doi.org/10.3923/tasr.2014.494.502.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

A.N, Asadu,, and Ofuyah W. N. "Miospore Biozonation and age characterization of Upper Miocene - Pliocene sediments in well X, deep offshore Niger delta." IOSR Journal of Applied Geology and Geophysics 05, no. 03 (May 2017): 06–13. http://dx.doi.org/10.9790/0990-0503010613.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Lai, Hongfei, Meijun Li, Jiguo Liu, Fengjun Mao, Hong Xiao, Wenxiang He, and Lu Yang. "Organic geochemical characteristics and depositional models of Upper Cretaceous marine source rocks in the Termit Basin, Niger." Palaeogeography, Palaeoclimatology, Palaeoecology 495 (April 2018): 292–308. http://dx.doi.org/10.1016/j.palaeo.2018.01.024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Boeglin, Jean-Loup, and Jean-Luc Probst. "Physical and chemical weathering rates and CO2 consumption in a tropical lateritic environment: the upper Niger basin." Chemical Geology 148, no. 3-4 (June 1998): 137–56. http://dx.doi.org/10.1016/s0009-2541(98)00025-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Picouet, Cécile, Benoît Hingray, and Jean Claude Olivry. "Modelling the suspended sediment dynamics of a large tropical river: the Upper Niger river basin at Banankoro." Hydrological Processes 23, no. 22 (October 30, 2009): 3193–200. http://dx.doi.org/10.1002/hyp.7398.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Tsuji, Linda A., Christian A. Sidor, J. Sébastien Steyer, Roger M. H. Smith, Neil J. Tabor, and Oumarou Ide. "The vertebrate fauna of the Upper Permian of Niger—VII. Cranial anatomy and relationships ofBunostegos akokanensis(Pareiasauria)." Journal of Vertebrate Paleontology 33, no. 4 (July 2013): 747–63. http://dx.doi.org/10.1080/02724634.2013.739537.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Turner, Morgan L., Linda A. Tsuji, Oumarou Ide, and Christian A. Sidor. "The vertebrate fauna of the upper Permian of Niger—IX. The appendicular skeleton ofBunostegos akokanensis(Parareptilia: Pareiasauria)." Journal of Vertebrate Paleontology 35, no. 6 (September 11, 2015): e994746. http://dx.doi.org/10.1080/02724634.2014.994746.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!