Luanda, Angola

Agostinho Neto University
Luanda, Angola

The Agostinho Neto University is a public Angolan university based in the capital, Luanda. Until 2009, it had campuses in all major Angolan cities. In the academic year 2005–06, 68 licensing courses were ministered by Agostinho Neto University: 18 in Bachelor’s and 15 in Master’s degrees, involving areas of scientific knowledge in the faculties, institutes and higher learning schools. It is one of seven public universities in Angola. Until 2009 the Agostinho Neto University was the only public university, but that year it was split up and its campuses outside Luanda were transformed into six autonomous universities, in Benguela, Cabinda, Huambo, Lubango, Malange and Uíge. Today "Universidade Agostinho Neto" is reduced to the status of one regional university among others, confined to the Luanda and Bengo provinces, but even so it is the largest university in Angola. While until 2000 its only competitor had been the Catholic University of Angola, it faces at this stage the competition of about a dozen private universities. Wikipedia.

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Livramento F.,Agostinho Neto University | Rangel I.M.,Instituto Nacional Of Investigacao Pesqueira
Toxicon | Year: 2010

The presence of ASP toxins in Luanda Bay, an area 2700 km apart from the closest record of this type of toxicity and with a different hydrographic regime, was studied. Two outbreaks were confirmed by LC/MS/MS with presence of domoic acid and some isomers both, in plankton and in three of the most important bivalve species from the area. Domoic acid levels in the studied bivalves were below the regulatory limits for most countries and the first estimations indicate that they depurated the toxin quickly. It is, therefore, unlikely that any intoxication would have taken place by consumption of these bivalve species. Notwithstanding, the relatively high annual frequency of the blooms together with possibility that other bivalve species could retain this compound more strongly, suggest that this kind of intoxication might pose a significant risk in Angola. © 2009 Elsevier Ltd. All rights reserved.

An annotated catalogue of the species and subspecies of tiger beetles (Coleoptera: Carabidae, Cicindelinae) hitherto known from Angola is given. A total of 89 forms (74 species and 15 subspecies) is recorded from this southwestern country of Africa. Within this assemblage there are 31 endemic forms (33.3%). Some species are represented by only the holotype specimen (some without locality) or the type series. Others were recorded based on a single specimen. Records for six species previously unknow from Angola are given: Foveodromica sp. n. 1, Foveodromica sp. n. 2, Ophryodera rufo-marginata bradshawi Péringuey, 1888, Elliptica muata parallelestriata (W. Horn, 1923), Lophyra differens (W. Horn, 1892) and Myriochila jucunda (Péringuey, 1892). A historical review, as well as some considerations on the distribution and conservation status of these beetles in Angola are also presented. Copyright © 2013 Magnolia Press.

Bello G.,Instituto Oswaldo Cruz FIOCRUZ | Afonso J.M.,Instituto Oswaldo Cruz FIOCRUZ | Afonso J.M.,Agostinho Neto University | Morgado M.G.,Instituto Oswaldo Cruz FIOCRUZ
Infection, Genetics and Evolution | Year: 2012

The HIV-1 subtype F1 is exceptionally prevalent in Angola, Brazil and Romania. The epidemiological context in which the spread of HIV occurred was highly variable from one country to another, mainly due to the existence of a long-term civil war in Angola and the contamination of a large number of children in Romania. Here we apply phylogenetic and Bayesian coalescent-based methods to reconstruct the phylodynamic patterns of HIV-1 subtype F1 in such different epidemiological settings. The phylogenetic analyses of HIV-1 subtype F1 pol sequences sampled worldwide confirmed that most sequences from Angola, Brazil and Romania segregated in country-specific monophyletic groups, while most subtype F1 sequences from Romanian children branched as a monophyletic sub-cluster (Romania-CH) nested within sequences from adults. The inferred time of the most recent common ancestor of the different subtype F1 clades were as follow: Angola=1983 (1978-1989), Brazil=1977 (1972-1981), Romania adults=1980 (1973-1987), and Romania-CH=1985 (1978-1989). All subtype F1 clades showed a demographic history best explained by a model of logistic population growth. Although the expansion phase of subtype F1 epidemic in Angola (mid 1980s to early 2000s) overlaps with the civil war period (1975-2002), the mean estimated growth rate of the Angolan F1 clade (0.49year -1) was not exceptionally high, but quite similar to that estimated for the Brazilian (0.69year -1) and Romanian adult (0.36year -1) subtype F1 clades. The Romania-CH subtype F1 lineage, by contrast, displayed a short and explosive dissemination phase, with a median growth rate (2.47year -1) much higher than that estimated for adult populations. This result supports the idea that the AIDS epidemic that affected the Romanian children was mainly caused by the spread of the HIV through highly efficient parenteral transmission networks, unlike adult populations where HIV is predominantly transmitted through sexual route. © 2012 Elsevier B.V.

Guiraud M.,University of Burgundy | Buta-Neto A.,Agostinho Neto University | Quesne D.,University of Burgundy
Marine and Petroleum Geology | Year: 2010

We analyse tectonic and sedimentary field and subsurface data for the Angola onshore margin together with free-air gravity anomaly data for the offshore margin. This enables us to characterize the mode of syn-rift tectonism inherited from the Precambrian and its impact on the segmentation of the Angola margin. We illustrate that segmentation by the progressive transition from the Benguela transform-rifted margin segment to the oblique-rifted South Kwanza and orthogonal-rifted North Kwanza margin segments. The spatial variation in the intensity of post-rift uplift is demonstrated by the study of a set of geomorphic markers detected in the post-rift succession of the coastal Benguela and Kwanza Basins: Upper Cretaceous to Cenozoic uplifted palaeodeltas, erosional unconformities, palaeovalleys, Quaternary marine terraces and perched Gilbert deltas. The onshore Benguela transform margin has a distinctive, mainly progradational stratigraphic architecture with long-term sedimentary gaps and high-elevation marine terraces resulting from moderate Upper Cretaceous-Cenozoic to major Quaternary uplifting (i.e. 775-1775 mm/ky or m/Ma). By contrast, repeated synchronous episodes of minor Cenozoic to Quaternary uplift occurred along the orthogonal-rifted North Kwanza segment with its Cenozoic aggradational architecture, short-term sedimentary gaps and low-elevation Pleistocene terraces. Margin style likewise governs spatial variations in the volume of offshore sediment dispersed in the associated deep-sea fans. Along the low-lying North Kwanza margin, sedimentation of the broad Cenozoic to Pleistocene Kwanza submarine fan was probably governed by the width of the Kwanza interior palaeodrainage basin combined with the wet tropical Neogene climate. Along the high-rising Benguela margin, the small size of the Benguela deep-sea fan is related to the interplay between moderate continental sediment dispersal from long-lived small catchments and a warm, very arid Neogene climate. However, the driving forces behind the epeirogenic post-rift uplift of the Angola coastal bulge remain a matter of speculation. © 2010 Elsevier Ltd.

Josens G.,Roosevelt University | Soki K.,Agostinho Neto University
Insectes Sociaux | Year: 2010

This article provides a meta-analysis of quantitative data available in literature regarding the relation between termite numbers and the volume of their mounds for 24 species belonging to 13 genera. The leading question behind this analysis is: "how do the respiratory gas exchanges regulate the size of termite mounds?" This question is answered through the analysis of the log-log regression between the volume of the mound and the number of inhabitants. The most confident data support the hypothesis of a respiratory regulation that can be achieved through a relation between the termite numbers and (1) the volume of their mounds (slope of the regression near 1, Noditermes), (2) the surface of the outer walls of their mounds (slope of the regression near 0.67, Termitinae and Nasutitermes) or (3) a compromise between the surface of the outer walls of their mounds and some linear structures of their nests (slope of the regression between 0.67 and 0.33, Trinervitermes and Macrotermes). The way this is achieved is linked with the architecture of the mound. A confident relation was found between the number of individuals and the epigeal volume of their mounds for 18 species for which the most reliable data were provided. Three more accurate models are proposed for estimating the termite population based on the nest material and architecture and on the size of the termites. © International Union for the Study of Social Insects (IUSSI) 2010.

Melgarejo J.C.,University of Barcelona | Costanzo A.,National University of Ireland | Bambi A.C.J.M.,Agostinho Neto University | Goncalves A.O.,Agostinho Neto University | Neto A.B.,Agostinho Neto University
Lithos | Year: 2012

The Tchivira carbonatites contain several pyrochlore generations. Rare pyrochlore crystals, close to the fluorcalciopyrochlore end member composition, occur as primary magmatic crystals and are replaced due to subsolidus hydrothermal processes. These produced leaching of Na in the A position, balanced by F removal from the Y position. Interaction of oxydizing hydrothermal fluids with carbonatites and host rocks produced a sequence of hydrothermal alterations with zonal distribution. From the host rock to the centre of the carbonatite intrusion, the succession of alteration types distinguished consists of fenitization, fluoritization/silicification, ankeritization and dolomitization. In addition, veins with vugs infilled by druse quartz, carbonates and fluorite are also common. Distinct pyrochlore compositions are characteristic for each altered unit. Plumbopyrochlore and Ba-rich kenopyrochlore occur in the fenites and in the fluoritized-silicified areas; Ba-rich kenopyrochlore is also found in the ankeritized areas and Sr-rich kenopyrochlore appears as rare crystals in the dolomitized areas. Sr-, Ba- and Pb-pyrochlores and Nb-rich rutile replace earlier pyrochlore generations and are present as inclusions in quartz and fluorite or as veinlets in fluoritized/silicified carbonatite. Minerals associated with Sr-, Ba- and Pb-pyrochlores include hematite, strontianite, barite and REE-fluocarbonates and phosphates, indicating oxidising conditions for mineral precipitation. Nb-rich rutile, gorceixite, Ba-rich K-feldspar and late Ba-poor K-feldspar can also occur in fenites and fluoritized rocks. Their presence implies that the composition of the altered host rock also affects the composition of the hydrothermal minerals. Textural evidences indicate that pyrochlore and these minerals are produced by precipitation from hydrothermal fluids and the distribution of the different pyrochlore types suggests that the nature of the hydrothermal fluid controls their composition. Finally, the replacement of pyrochlore crystals by goethite, as well as the occurrence of Nb-rich goethite and Fe-Mn oxyhydroxides, indicates that Nb can be also transported by supergenic fluids. In synthesis, the role of subsolidus processes is a key factor for the distribution of Nb-bearing minerals in carbonatites. © 2012 Elsevier B.V.

Bambi A.C.J.M.,Agostinho Neto University | Costanzo A.,National University of Ireland | Goncalves A.O.,Agostinho Neto University | Melgarejo J.C.,University of Barcelona
Mineralogical Magazine | Year: 2012

Three Angolan carbonatites were selected to evaluate the change in composition of pyrochlores during magmatic evolution: the Tchivira carbonatites occur in a plutonic complex, the Bonga carbonatites represent hypabyssal carbonatites and the Catanda carbonatites are volcanic in origin. In Tchivira pyrochlore, zoning is poorly developed; fluorine is dominant at the Y site; chemical zoning may arise as a result of substitutions for Nb in the B site; and the rare earth element (REE), U, Th and large-ion lithophile element (LILE) contents are very low. Pyrochlores from Bonga show oscillatory zonation; the F and Na contents are lower than those in the pyrochlores from Tchivira; and as substitution of Na at the A site increases, the Th, U, REE contents and inferred vacancies also increase. Pyrochlores from Catanda display complex textures. They generally have a rounded corroded core, which is mantled by two or three later generations. The core composition is similar to the Bonga pyrochlores. The rims are enriched in Zr, Ta, Th, Ce and U, but depleted in F and Na. In pyrochlores from the Angolan carbonatites, the F and Na contents decrease from plutonic to volcanic settings and there is enrichment of Th, U and REE in the A site and Ta and Zr in the B site. Zoning may be explained by changes in the activity of F, due to the crystallization of fluorite or apatite in the plutonic and hypabyssal carbonatites, or to volatile exsolution in the volcanic carbonatites. © 2012 Mineralogical Society.

Moral J.,ETSIAM | Jurado-Bello J.,ETSIAM | Sanchez M.I.,ETSIAM | Oliveira R.D.,Agostinho Neto University | Trapero A.,ETSIAM
Phytopathology | Year: 2012

The influence of temperature, wetness duration, and planting density on infection of olive fruit by Colletotrichum acutatum and C. simmondsii was examined in laboratory and field experiments. Detached olive fruit of 'Arbequina', 'Hojiblanca', and 'Picual' were inoculated with conidia of several isolates of the pathogen and kept at constant temperatures of 5 to 35°C in humid chambers. Similarly, potted plants and stem cuttings with fruit were inoculated and subjected to wetness periods of 0 to 48 h. Infection occurred at 10 to 25°C, and disease severity was greater and the mean latent period was shorter at 17 to 20°C. Overall, C. acutatum was more virulent than C. simmondsii at temperatures <25°C. When temperature was not a limiting factor, disease severity increased with the wetness period from 0 to 48 h. Disease severity was modeled as a function of temperature and wetness duration; two critical fruit incidence thresholds were defined as 5 and 20%, with wetness durations of 1.0 and 12.2 h at the optimum temperature. In the field, anthracnose epidemics progressed faster in a super-high-density planting (1,904 olive trees/ha) than in the high-density plantings (204 to 816 olive trees/ha) and caused severe epidemics in the super-high-density planting even with the moderately resistant Arbequina. Data in this study will be useful for the development of a forecasting system for olive anthracnose epidemics. © 2012 The American Phytopathological Society.

Pinto F.J.,Agostinho Neto University
Advances in Intelligent Systems and Computing | Year: 2016

This work describes the structure and the operation of a basic genetic algorithm. The studies show that the genetics algorithms (GAs) always offer an answer that tends to be the best over time, satisfied with knowledge on the problem, we can improve the function of evaluation that was always search of inside the current population those solutions that possess the best characteristic and tries to combine them of form to generate solutions still better and the process is repeated until we have obtained a solution for our problem. The (GA) go in the scene to resolve those problems whose exact algorithms are extremely slow or unable to obtain a solution. © Springer International Publishing Switzerland 2016.

Calado M.P.,Agostinho Neto University | Ramos A.,Agostinho Neto University
2016 IST-Africa Conference, IST-Africa 2016 | Year: 2016

Information systems have introduced efficient ways to improve the quality of life of citizens in several areas, including health. The use of computers in this area has been spreading into new ways that enable the optimization of provided healthcare services. In Angola there still is an incipient use of Information Systems applied to Healthcare. It was identified the lack of an efficient way to access Medical Emergency Services in Angola. We present a web-based information system to guide and manage this access, responding to the need of improvement and optimization of the access to emergency services, enabling health authorities a greater degree of knowledge about patients referred to them and a more balanced use of its resources. Our system encourages coordination and collaboration among providers of healthcare services, providing a feature of triage and referral of users according to the diagnosis and hospital availability. Some aspects of this system are highlighted. © 2016 IIMC.

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