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Sample records for testing freshwater lago

  1. Testing freshwater Lago Mare dispersal theory on the phylogeny relationships of iberian cyprinid genera Chondrostoma and Squalius (Cypriniformes, Cyprinidae

    Directory of Open Access Journals (Sweden)

    Carmona, José Ambrosio

    2003-12-01

    Full Text Available A phylogeny of the species in the genera Chondrostoma and Squalius was constructed based on the complete mitochondrial cytochrome b gene (1140pb. The molecular phylogeny was used to test the effect of the Mediterranean Lago Mare dispersal theory on the processes of divergence and speciation of European freshwater fishes. Phylogenetic relationships among Squalius samples and the molecular clock revealed that the ancestor of the current Iberian Squalius species inhabited a wide geographic area in the central and southwestern part of the former Iberian Peninsula during the Miocene before the Lago Mare phase. Similarly, the four main Iberian lineages of the genus Chondrostoma originated in the Middle-Upper Miocene. Hence, the Lago Mare phase of the Mediterranean Sea seems to have been a too recent paleogeographic event to have had any major impact on the dispersion of Squalius and Chondrostoma species. However, the reduction of the water-bodies during the Tortonian and Messinian may have intensified the isolation of populations. The Operational Biogeographic Units recovered from the Squalius and Chondrostoma phylogenies also reject the Lago Mare dispersal theory and support the idea that the differentiation processes were due to both the formation of the current hydrographical basin during the Plio-Pleistocene as well as to an earlier endorrheism event that occurred prior to hydrographical configuration.Realizamos una filogenia de los géneros Chondrostoma y Squalius mediante el estudio de la secuencia completa del gen mitocondrial citocromo b (1140pb. La filogenia molecular fue usada para comprobar el efecto que la teoría de dispersión del Mediterráneo Lago Mare ha tenido sobre los procesos de divergencia y especiación en los peces de agua dulce europeos. Las relaciones filogenéticas entre las muestras de Squalius y la aplicación del reloj molecular pusieron de manifiesto que el ancestro de las actuales especies ibéricas de Squalius habitaba

  2. Freshwater Treatment and Test Facility

    Data.gov (United States)

    Federal Laboratory Consortium — The Freshwater Treatment and Test Facility, located at SANGB, has direct year-round access to water from Lake St. Clair and has a State of Michigan approved National...

  3. First evidence of "paralytic shellfish toxins" and cylindrospermopsin in a Mexican freshwater system, Lago Catemaco, and apparent bioaccumulation of the toxins in "tegogolo" snails (Pomacea patula catemacensis).

    Science.gov (United States)

    Berry, John P; Lind, Owen

    2010-05-01

    Exposure to cyanobacterial toxins in freshwater systems, including both direct (e.g., drinking water) and indirect (e.g., bioaccumulation in food webs) routes, is emerging as a potentially significant threat to human health. We investigated cyanobacterial toxins, specifically cylindrospermopsin (CYN), the microcystins (MCYST) and the "paralytic shellfish toxins" (PST), in Lago Catemaco (Veracruz, Mexico). Lago Catemaco is a tropical lake dominated by Cylindrospermopsis, specifically identified as Cylindrospermopsis catemaco and Cylindrospermopsis philippinensis, and characterized by an abundant, endemic species of snail (Pomacea patula catemacensis), known as "tegogolos," that is both consumed locally and commercially important. Samples of water, including dissolved and particulate fractions, as well as extracts of tegogolos, were screened using highly specific and sensitive ELISA. ELISA identified CYN and PST at low concentrations in only one sample of seston; however, both toxins were detected at appreciable quantities in tegogolos. Calculated bioaccumulation factors (BAF) support bioaccumulation of both toxins in tegogolos. The presence of CYN in the phytoplankton was further confirmed by HPLC-UV and LC-MS, following concentration and extraction of algal cells, but the toxin could not be confirmed by these methods in tegogolos. These data represent the first published evidence for CYN and the PST in Lago Catemaco and, indeed, for any freshwater system in Mexico. Identification of the apparent bioaccumulation of these toxins in tegogolos may suggest the need to further our understanding of the transfer of cyanobacterial toxins in freshwater food webs as it relates to human health. Copyright 2009 Elsevier Ltd. All rights reserved.

  4. Freshwater algae of the Nevada Test Site

    International Nuclear Information System (INIS)

    Taylor, W.D.; Giles, K.R.

    1979-06-01

    Fifty-two species of freshwater algae were identified in samples collected from the eight known natural springs of the Nevada Test Site. Although several species were widespread, 29 species were site specific. Diatoms provided the greatest variety of species at each spring. Three-fifths of all algal species encountered were diatoms. Well-developed mats of filamentous green algae (Chlorophyta) were common in many of the water tanks associated with the springs and accounted for most of the algal biomass. Major nutrients were adequate, if not abundant, in most spring waters - growth being limited primarily by light and physical habitat. There was some evidence of cesium-137 bioconcentration by algae at several of the springs

  5. Freshwater algae of the Nevada Test Site

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, W.D.; Giles, K.R.

    1979-06-01

    Fifty-two species of freshwater algae were identified in samples collected from the eight known natural springs of the Nevada Test Site. Although several species were widespread, 29 species were site specific. Diatoms provided the greatest variety of species at each spring. Three-fifths of all algal species encountered were diatoms. Well-developed mats of filamentous green algae (Chlorophyta) were common in many of the water tanks associated with the springs and accounted for most of the algal biomass. Major nutrients were adequate, if not abundant, in most spring waters - growth being limited primarily by light and physical habitat. There was some evidence of cesium-137 bioconcentration by algae at several of the springs.

  6. A New Toxicity Test Using the Freshwater Copepod Cyclops vernalis.

    Science.gov (United States)

    Marus, Emma M; Elphick, James R; Bailey, Howard C

    2015-09-01

    The cladocerans Ceriodaphnia dubia and Daphnia magna are widely used in environmental toxicity testing and the test methodologies for these species are well developed. However, copepods are a much more abundant contributor to zooplankton in many lakes, but they are not routinely used in toxicity tests. Therefore, we propose toxicity test methods for the freshwater copepod, Cyclops vernalis assessing effects on its survival and growth. A case study is presented in which the proposed test was performed with a range of concentrations of total dissolved solids (TDS) and used as part of a test battery to develop a site-specific water quality objective. C. vernalis was less sensitive to TDS compared to D. magna and C. dubia, but similarly sensitive to an alga, a diatom, a rotifer, a chironomid, and two fish species. No adverse effects were observed on survival or growth of C. vernalis at TDS concentrations up to 1500 mg/L.

  7. Freshwater Fish Sublethal Tests: A Review of the Sublethal Tests

    Science.gov (United States)

    Pressure on animal testing has traditionally been the purview of mammalian toxicological science, but in the past few years, more attention is given also to environmental safety. As with higher vertebrate animal alternatives, balance between reduce animal use without impairing o...

  8. Dose-Time Effect of Crude Oil and Hydro-test Effluent on Freshwater ...

    African Journals Online (AJOL)

    This work was undertaken to investigate the dose-time effect of crude oil and hydro-test effluent on freshwater and brackish water habitats. The species used for the acute toxicity were freshwater fish, Tilapia guineenis (fry) and a brackish water shrimp, Palaemonetes africanus. Test results indicated that the brackish water ...

  9. Freshwater toxicity testing using rehydrated Philodina sp. (Rotifera) as test animals.

    Science.gov (United States)

    Snell, Terry W; Johnston, Rachel K; Matthews, Amelia B

    2017-10-01

    Rotifers have become widely used in aquatic toxicology as a rapid screening test for toxicity. The commercial availability of diapausing embryos (cysts) have facilitated their popularity because test animals can be obtained without having to master the details of culturing. Other rotifer species have life stages capable of surviving desiccation and also could be used in non-culture systems for toxicity assessment. In this article, we describe a system for toxicity testing in freshwater based on rehydrating desiccated bdelloid rotifers in the genus Philodina. These animals can remain in this anhydrobiotic state for more than one year and then rehydrate within hours to provide animals for toxicity tests. We describe three endpoints: a 1.5 h ingestion test, a 24 h mortality test, and a five day reproductive test. The latter test requires feeding and a method using a dried commercial product is explained. Using desiccated rotifers and dried food in toxicity tests make this system especially attractive because of its flexibility and low threshold of biological expertise required to execute the tests. The use of the Philodina toxicity test is illustrated with four metals: copper, lead, mercury and cadmium. Reproduction generally was the most sensitive endpoint, with EC50s of 0.33, 0.44, 0.60, and 0.12 mg/L, respectively. Ingestion was a close second with EC50s of 0.13, 1.64, 0.64, and 6.26 mg/L, respectively. © 2017 Wiley Periodicals, Inc.

  10. Freshwater shrimps as sensitive test species for the risk assessment of pesticides in the tropics.

    Science.gov (United States)

    Daam, Michiel A; Rico, Andreu

    2016-08-17

    The aquatic risk assessment of pesticides in tropical areas has often been disputed to rely on toxicity data generated from tests performed with temperate species. Given the differences in ecosystem structure between temperate and tropical ecosystems, test species other than those used in temperate regions have been proposed as surrogates for tropical aquatic effect assessments. Freshwater shrimps, for example are important components of tropical freshwater ecosystems, both in terms of their role in ecosystem functioning and their economic value. In the present study, available toxicity data of (tropical and sub-tropical) freshwater shrimps for insecticides and fungicides were compiled and compared with those available for Daphnia magna and other aquatic invertebrates. Freshwater shrimps appeared to be especially sensitive to GABA-gated chloride channel antagonist and sodium channel modulator insecticides. However, shrimp taxa showed a moderate and low sensitivity to acetylcholinesterase inhibiting insecticides and fungicides respectively. Implications for the use of freshwater shrimps in tropical pesticide effect assessments and research needs are discussed.

  11. El lago de tota

    OpenAIRE

    Borrero H., José I.

    2012-01-01

    Puesto que el lago de Tola constituye hoy en día la única fuente de abastecimiento de agua para nuestra máxima industria nacional, como es Acerías de Paz del Río, porque esta industria depende en un ciento por ciento del lago de Tota para su desarrollo actual y ensanches futuros, según concepto de sus directivas además por ser este un lugar de incomparable belleza al cual debe dársele la importancia que merece, se ha resuelto escribir estas líneas, en las cuales el lector encontrará esbozados...

  12. Lagos Historical Review

    African Journals Online (AJOL)

    The Lagos Historical Review is an international and interdisciplinary journal publishing papers with a historical focus. The journal generates and participates in debates to advance the discipline of history and promote its relevance to development. The journal aims to serve the academic community with a bias towards ...

  13. Lagos Notes and Records

    African Journals Online (AJOL)

    Lagos Notes and Records is an annual, interdisciplinary journal of the humanities. It is devoted to the publication of well-researched articles in all the subjects in the Arts, Social Sciences, and Law. In addition to original articles, the journal publishes review articles, brief accounts of work in progress, notes and comments on ...

  14. El Lago de Tota

    Directory of Open Access Journals (Sweden)

    Borrero H. José I.

    1963-06-01

    Full Text Available Puesto que el lago de Tola constituye hoy en día la única fuente de abastecimiento de agua para nuestra máxima industria nacional, como es Acerías de Paz del Río, porque esta industria depende en un ciento por ciento del lago de Tota para su desarrollo actual y ensanches futuros, según concepto de sus directivas además por ser este un lugar de incomparable belleza al cual debe dársele la importancia que merece, se ha resuelto escribir estas líneas, en las cuales el lector encontrará esbozados en la forma más sucinta posible una serie de hechos que a no dudar todos hemos observado al visitar el lago. No se pretende que este pequeño escrito abarque todo el problema que es de por sí muy vasto y que posiblemente ha sido tratado ya antes con mayor propiedad, pero sí se espera que produzca en cada uno de los lectores una reacción que sea lo suficientemente grande para que logre convertirlos en admiradores de Tota por consiguiente en sus perennes defensores. No tratamos tampoco de inculpar a nadie y menos a ninguna de las entidades nacionales responsables de la conservación de nuestros recursos naturales, sino simplemente de alertar a todos los directivos de esas entidades para que de común acuerdo logremos salvar el Lago de Tota.

  15. Toxicity tests based on predator-prey and competitive interactions between freshwater macroinvertebrates

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, E.J.; Blockwell, S.J.; Pascoe, D. [Univ. of Wales Coll. of Cardiff (United Kingdom)

    1994-12-31

    Simple multi-species toxicity tests based on the predation of Daphnia magna Straus by Hydra oligactis (Pallas) and competition between Gammarus pulex (L.) and Asellus aquaticus (L.) were used to determine the effects of three reference chemicals. Criteria examined included functional responses; time to first captures; handling times (predator/prey systems) and co-existence and growth. The tests which proved most practicable and sensitive (lowest observed effects 0.1, 21, and 80 {micro}g/l for lindane, copper and 3,4 dichloroaniline, respectively) were: (1) predator-prey tests: determining changes in the size-structure of predated D. magna populations and (2) competition tests: measuring the feeding rate of G. pulex competing with A. aquaticus, using a bioassay based on the time-response analysis of the consumption of Artemia salina eggs. The concentration of a chemical which affected particular response criteria was fond to depend on the test system employed. Results of the tests indicated that effects were often not dose-related and that a given criterion could be variously affected by different test concentrations. The complex pattern of responses may be explained in terms of the differential sensitivity of the interacting species and perhaps subtle alteration in strategies. The sensitivity of the bioassay endpoints is compared to those of a range of single species tests, and their value for predicting the impact pollutants may have upon natural freshwater ecosystems is discussed.

  16. Acute sensitivity of freshwater mollusks and commonly tested invertebrates to select chemicals with different toxic models of action

    Science.gov (United States)

    Previous studies indicate that freshwater mollusks are more sensitive than commonly tested organisms to some chemicals, such as copper and ammonia. Nevertheless, mollusks are generally under-represented in toxicity databases. Studies are needed to generate data with which to comp...

  17. The Seis Lagos Carbonatite Complex

    International Nuclear Information System (INIS)

    Issler, R.S.; Silva, G.G. da.

    1980-01-01

    The Seis Lagos Carbonatite Complex located about 840 Km from Manaus, on the northwestern part of the Estado do Amazonas, Brazil is described. Geological reconnaissance mapping by Radam Project/DNPM, of the southwestern portion of the Guianes Craton, determined three circular features arranged in a north-south trend and outcroping as thick lateritic radioactive hills surrounded by gneisses and mignatites of the peneplained Guianense Complex. Results of core drilling samples analysis of the Seis Lagos Carbonatite Complex are compared with some igneous rocks and limestones of the world on the basis of abundance of their minor and trace elements. Log-log variation diagram of strontium and barium in carbonatite and limestone, exemplifield by South Africa and Angola carbonatites, are compared with the Seis Lagos Carbonatite Complex. The Seis Lagos Carbonatite Complex belongs to the siderite-soevite type. (E.G.) [pt

  18. A new tropical algal test to assess the toxicity of metals in freshwaters. Supervising Scientists Report 133

    International Nuclear Information System (INIS)

    Franklin, N.; Stauber, J.; Markich, S.; Lim, R.

    1998-01-01

    Copper (Cu) and uranium (U) are of potential ecotoxicological concern to tropical Australian freshwater biota as a result of mining impacts. No local data on the toxicity of these metals to tropical freshwater algae are currently available. The aim of this study was to develop a toxicity test for an Australian tropical freshwater alga that can be added to the suite of tests currently available for tropical freshwater invertebrates and fish. This toxicity test was used to investigate the toxicity of Cu and U to the alga Chlorella sp (new species) in a synthetic softwater and to specifically determine the effect of pH on metal toxicity over the range typically found in soft fresh surface waters in tropical northern Australia. A growth inhibition toxicity test was successfully developed for this alga, which was isolated from Kakadu National Park, Northern Territory, prior to conducting the toxicity testing. Key environmental parameters including light, temperature and nutrients were optimised to obtain acceptable algal growth rates over 72 hours. HEPES buffer (2 mM at pH 6.5) was found to be a suitable and practical option for pH control that could be incorporated in the test protocol for Chlorella sp. The results obtained in this study confirmed a lack of toxic effects by HEPES on the algae, as well as negligible complexation with both Cu and U. Adequate pH control (ie -1 ) than U (13 μg L -1 ), and more sensitive than other Australian tropical freshwater species, with an order of sensitivity: Alga ≥Crustacea > Cnidaria > Mollusca > Chordata. The toxicity of Cu and U was highly pH-dependent. Copper concentrations needed to inhibit growth by 50% (72 h EC 50 ) increased from 1.5 to 35 μg Cu L -1 as the pH decreased from 6.5 to 5.7. The 72 h EC 50 for U increased from 44 to 78 μg U L -1 over the same pH range. Decreased toxicity at pH 5.7 was due to lower concentrations of cell-bound and intracellular Cu and U compared to that at pH 6.5. These results are explained

  19. National Biodiversity Assessment – Testing the integrity of our freshwater ecosystems

    CSIR Research Space (South Africa)

    Van Deventer, Heidi

    2016-08-01

    Full Text Available is planned at various conferences and meetings. A temporary web map viewer (http://gsdi.geoportal. csir.co.za/projects/national-biodiversity-assessment-of-2018) has also been created to allow people to view the freshwater ecosystem types and provide...

  20. Fatty acid composition and amino acid profile of two freshwater ...

    African Journals Online (AJOL)

    The proximate, fatty and amino acids composition of two commercially important freshwater fish species Clarias gariepinus and Tilapia zillii. purchased from local fishermen in two landing sites in Lagos State, Nigeria were determined. Live specimens of C. gariepinus were purchased while samples of T. zillii were stored in ...

  1. Colonial land policies in Lagos | Davies | Lagos Historical Review

    African Journals Online (AJOL)

    Land policies in colonial Lagos were variegated. They alternated between freehold at inception of colonialism in 1861, and customary tenure at the beginning of the twentieth century and later coalesced into a combination of both. The variegated nature of the colonial government's land policies created a lot of confusion in ...

  2. Assessment of Social Anxiety among Adolescents in Lagos Metropolis

    African Journals Online (AJOL)

    The main objective of this study was to assess the prevalence of social anxiety among adolescents in Lagos metropolis. The following hypotheses were formulated and tested to achieve the objective: (1) Female participants will have significantly higher scores in measures of SAS than male participants. (2) There will be ...

  3. Performance of small and medium enterprises in Lagos state: the ...

    African Journals Online (AJOL)

    The main aim of this study is to examine the impact of finance on the performance of small and medium enterprises in Lagos State. The research design adopted for this study is survey research design. Data analysis and hypotheses test from 250 SME owners and operators using Pearson correlation and regression ...

  4. Evaluation of measles vaccine cold chain in Lagos State, Nigeria ...

    African Journals Online (AJOL)

    The National (level 1), State (L2), and Local government vaccine cold stores (L3) as well as some vaccination centres (L4) were physically inspected in Lagos State, Nigeria and the potency of the live-attenuated measles vaccine was tested. Both the L1 and L2 storage facilities were formally adequately equipped and ...

  5. Freshwater Macroinvertebrates.

    Science.gov (United States)

    Nalepa, T. F.

    1978-01-01

    Presents a literature review of freshwater biology particularly freshwater macroinvertebrates and their effect on water pollution, covering publications of 1976-77. A list of 158 references is also presented. (HM)

  6. Lagos Journal of Library and Information Science: Contact

    African Journals Online (AJOL)

    Principal Contact. Adebambo Oduwole (Ph.D) Editor-in-Chief Lagos State University Library, Ojo, Lagos Lagos Journal of Library and Information Science. University of Lagos Library, Akoka-Yaba, Lagos Nigeria. Alternative Email: nlalagos@outlook.com. Email: bambose26@yahoo.com ...

  7. the Lagos State of Nigeria

    African Journals Online (AJOL)

    were obtained from the records of events in the Register of the Lagos Mainland, Epe and Badagry Local Governments. For the primary source, two hundred question- naires, making 34.48 per cent of the number of elements in the secondary data were distributed to respondents in both rural and urban areas of the state.

  8. Turtles: Freshwater

    Science.gov (United States)

    Gibbons, J. Whitfield; Lovich, Jeffrey E.; Bowden, R.M.

    2017-01-01

    With their iconic shells, turtles are morphologically distinct in being the only extant or extinct vertebrate animals to have their shoulders and hips inside their rib cages. By the time an asteroid hit the earth 65.5 million years ago, causing the extinction of dinosaurs, turtles were already an ancient lineage that was 70% through their evolutionary history to date. The remarkable evolutionary success of turtles over 220 million years is due to a combination of both conservative and effective life history traits and an essentially unchanging morphology that withstood the test of time. However, the life history traits of many species make them particularly susceptible to overharvest and habitat destruction in the modern world, and a majority of the world’s species face serious conservation challenges with several extinctions documented in modern times. The global plight of turtles is underscored by the fact that the percentage of imperiled species exceeds that of even the critically endangered primates.Freshwater turtles, with over 260 recognized species, have become a focus on a worldwide scale for many conservation issues. This article is a synthesis of a diverse body of information on the general biology of freshwater turtles, with particular emphasis on the extensive research on ecology, life history, and behavior that has been accomplished in the last half century. Much of the research has been applicable to the aforementioned conservation challenges. The studies presented include a combination of laboratory and field experiments and observational studies on this intriguing group of animals.

  9. Lago Amazonas: fact or fancy?

    International Nuclear Information System (INIS)

    Tuomisto, H.; Ruokolainen, K.

    1992-01-01

    It has been suggested that a huge lake, Lago Amazonas, covered a large part of the Amazon basin until as recently as two thousand years ago. According to this hypothesis, the topmost sediments in western Amazonia are almost universally young deposit of lacustrine and deltaic origin. The hypothesis has gained some attention among biologists because of its implications for biological phenomena in Amazonia, especially bio geography and bio diversity. According to the available geological data, however, Amazonia is geologically far more complex than assumed by the lake hypothesis. This paper discussed the weaknesses of the Lago Amazonas hypothesis, and indicate alternative explanations of the surface geology that are based on tectonically controlled fluvial deposition. Some aspects of radiocarbon dating method are also presented. (author)

  10. Freshwater Fungal Infections

    Directory of Open Access Journals (Sweden)

    Dennis J. Baumgardner

    2017-01-01

    Full Text Available Fungal infections as a result of freshwater exposure or trauma are fortunately rare. Etiologic agents are varied, but commonly include filamentous fungi and Candida. This narrative review describes various sources of potential freshwater fungal exposure and the diseases that may result, including fungal keratitis, acute otitis externa and tinea pedis, as well as rare deep soft tissue or bone infections and pulmonary or central nervous system infections following traumatic freshwater exposure during natural disasters or near-drowning episodes. Fungal etiology should be suspected in appropriate scenarios when bacterial cultures or molecular tests are normal or when the infection worsens or fails to resolve with appropriate antibacterial therapy.

  11. Preparation and characterization of nickel-spiked freshwater sediments for toxicity tests: toward more environmentally realistic nickel partitioning.

    Science.gov (United States)

    Brumbaugh, William G; Besser, John M; Ingersoll, Christopher G; May, Thomas W; Ivey, Chris D; Schlekat, Christian E; Garman, Emily Rogevich

    2013-11-01

    Two spiking methods were compared and nickel (Ni) partitioning was evaluated during a series of toxicity tests with 8 different freshwater sediments having a range of physicochemical characteristics. A 2-step spiking approach with immediate pH adjustment by addition of NaOH at a 2:1 molar ratio to the spiked Ni was effective in producing consistent pH and other chemical characteristics across a range of Ni spiking levels. When Ni was spiked into sediment having a high acid-volatile sulfide and organic matter content, a total equilibration period of at least 10 wk was needed to stabilize Ni partitioning. However, highest spiking levels evidently exceeded sediment binding capacities; therefore, a 7-d equilibration in toxicity test chambers and 8 volume-additions/d of aerobic overlying water were used to avoid unrealistic Ni partitioning during toxicity testing. The 7-d pretest equilibration allowed excess spiked Ni and other ions from pH adjustment to diffuse from sediment porewater and promoted development of an environmentally relevant, 0.5- to 1-cm oxic/suboxic sediment layer in the test chambers. Among the 8 different spiked sediments, the logarithm of sediment/porewater distribution coefficient values (log Kd ) for Ni during the toxicity tests ranged from 3.5 to 4.5. These Kd values closely match the range of values reported for various field Ni-contaminated sediments, indicating that testing conditions with our spiked sediments were environmentally realistic. © 2013 SETAC.

  12. Ectopic Pregnancy: Lagos University Teaching Hospital Experience ...

    African Journals Online (AJOL)

    Ectopic pregnancy remains one of the commonest gynaecological emergencies in developing countries. In a retrospective study of ectopic pregnancy carried out at Lagos University Teaching Hospital (LUTH), Lagos, Nigeria, over a five year period, 272 cases were managed with an incidence of 43.8/1000 deliveries.

  13. Variability of sediment-contact tests in freshwater sediments with low-level anthropogenic contamination - Determination of toxicity thresholds

    Energy Technology Data Exchange (ETDEWEB)

    Hoess, S., E-mail: hoess@ecossa.d [Ecossa, Giselastr. 6, 82319 Starnberg (Germany); Institute of Biodiversity - Network (IBN), Dreikronengasse 2, 93047 Regensburg (Germany); Ahlf, W., E-mail: ahlf@tu-harburg.d [Institute of Environmental Technology and Energy Economics, Technical University Hamburg-Harburg, Eissendorfer Str. 40, 21071 Hamburg (Germany); Fahnenstich, C. [Institute of Environmental Technology and Energy Economics, Technical University Hamburg-Harburg, Eissendorfer Str. 40, 21071 Hamburg (Germany); Gilberg, D., E-mail: d-gilberg@ect.d [ECT Oekotoxikologie, Boettgerstr. 2-14, 65439 Floersheim (Germany); Hollert, H., E-mail: henner.hollert@bio5.rwth-aachen.d [Department of Ecosystem Analysis, Institute for Environmental Research (Biology 5), RWTH Aachen University, Worringerweg 1, 52074 Aachen (Germany); Melbye, K. [Dr. Fintelmann and Dr. Meyer, Mendelssohnstr. 15D, 22761 Hamburg (Germany); Meller, M., E-mail: m-meller@ecotox-consult.d [ECT Oekotoxikologie, Boettgerstr. 2-14, 65439 Floersheim (Germany); Hammers-Wirtz, M., E-mail: hammers-wirtz@gaiac.rwth-aachen.d [Research Institute for Ecosystem Analysis and Assessment (gaiac), RWTH Aachen University, Worringerweg 1, 52056 Aachen (Germany); Heininger, P., E-mail: heininger@bafg.d [Federal Institute of Hydrology (BfG), Am Mainzer Tor 1, 56070 Koblenz (Germany); Neumann-Hensel, H., E-mail: hensel@fintelmann-meyer.d [Dr. Fintelmann and Dr. Meyer, Mendelssohnstr. 15D, 22761 Hamburg (Germany); Ottermanns, R., E-mail: ottermanns@bio5.rwth-aachen.d [Chair for Environmental Biology and Chemodynamics, Institute for Environmental Research (Biology 5), RWTH Aachen University, Worringerweg 1, 52074 Aachen (Germany); Ratte, H.-T., E-mail: toni.ratte@bio5.rwth-aachen.d [Chair for Environmental Biology and Chemodynamics, Institute for Environmental Research (Biology 5), RWTH Aachen University, Worringerweg 1, 52074 Aachen (Germany)

    2010-09-15

    Freshwater sediments with low levels of anthropogenic contamination and a broad range of geochemical properties were investigated using various sediment-contact tests in order to study the natural variability and to define toxicity thresholds for the various toxicity endpoints. Tests were performed with bacteria (Arthrobacter globiformis), yeast (Saccharomyces cerevisiae), nematodes (Caenorhabditis elegans), oligochaetes (Lumbriculus variegatus), higher plants (Myriophyllum aquaticum), and the eggs of zebrafish (Danio rerio). The variability in the response of some of the contact tests could be explained by particle size distribution and organic content. Only for two native sediments could a pollution effect not be excluded. Based on the minimal detectable difference (MDD) and the maximal tolerable inhibition (MTI), toxicity thresholds (% inhibition compared to the control) were derived for each toxicity parameter: >20% for plant growth and fish-egg survival, >25% for nematode growth and oligochaete reproduction, >50% for nematode reproduction and >60% for bacterial enzyme activity. - Sediment-contact tests require toxicity thresholds based on their variability in native sediments with low-level contamination.

  14. A rapid phenol toxicity test based on photosynthesis and movement of the freshwater flagellate, Euglena agilis Carter.

    Science.gov (United States)

    Kottuparambil, Sreejith; Kim, Youn-Jung; Choi, Hoon; Kim, Mi-Sung; Park, Areum; Park, Jihae; Shin, Woongghi; Han, Taejun

    2014-10-01

    Phenol, a monosubstituted aromatic hydrocarbon with various commercial uses, is a major organic constituent in industrial wastewaters. The ecotoxic action of phenol for aquatic environment is well known. In this study, rapid phenol toxicity tests (1h) were developed based on chlorophyll a (Chl a) fluorescence and the movement parameters of the freshwater flagellate, Euglena agilis Carter. Phenol significantly reduced the maximum quantum yield (Fv/Fm) of photosystem II (PS II) and the maximum photosynthetic electron transport rate (rETRmax) with median effective concentration (EC50) values of 8.94 and 4.67 mM, respectively. Phenol reduced the motility and triggered change in the swimming velocity of the test organism. Among the parameters tested, velocity was the most sensitive biomarker with an EC50 of 3.17 mM. The EC50 values for Fv/Fm, motility, and velocity appear to overlap the permitted levels of phenol. In conclusion, the photosynthesis and movement of E. agilis can be fast and sensitive risk assessment parameters for the evaluation of phenol toxicity in municipal and industrial effluents. Copyright © 2014 Elsevier B.V. All rights reserved.

  15. Intra- and interlaboratory variability in acute toxicity tests with glochidia and juveniles of freshwater mussels (Unionidae)

    Science.gov (United States)

    Wang, N.; Augspurger, T.; Barnhart, M.C.; Bidwell, Joseph R.; Cope, W.G.; Dwyer, F.J.; Geis, S.; Greer, I.E.; Ingersoll, C.G.; Kane, C.M.; May, T.W.; Neves, R.J.; Newton, T.J.; Roberts, A.D.; Whites, D.W.

    2007-01-01

    The present study evaluated the performance and variability in acute toxicity tests with glochidia and newly transformed juvenile mussels using the standard methods outlined in American Society for Testing and Materials (ASTM). Multiple 48-h toxicity tests with glochidia and 96-h tests with juvenile mussels were conducted within a single laboratory and among five laboratories. All tests met the test acceptability requirements (e.g., ???90% control survival). Intralaboratory tests were conducted over two consecutive mussel-spawning seasons with mucket (Actinonaias ligamentina) or fatmucket (Lampsilis siliquoidea) using copper, ammonia, or chlorine as a toxicant. For the glochidia of both species, the variability of intralaboratory median effective concentrations (EC50s) for the three toxicants, expressed as the coefficient of variation (CV), ranged from 14 to 27% in 24-h exposures and from 13 to 36% in 48-h exposures. The intralaboratory CV of copper EC50s for juvenile fatmucket was 24% in 48-h exposures and 13% in 96-h exposures. Interlaboratory tests were conducted with fatmucket glochidia and juveniles by five laboratories using copper as a toxicant. The interlaboratory CV of copper EC50s for glochidia was 13% in 24-h exposures and 24% in 48-h exposures, and the interlaboratory CV for juveniles was 22% in 48-h exposures and 42% in 96-h exposures. The high completion success and the overall low variability in test results indicate that the test methods have acceptable precision and can be performed routinely. ?? 2007 SETAC.

  16. the Lagos Lagoon

    African Journals Online (AJOL)

    komla

    slight variations, Hg was found to be most toxic of the test metal compounds followed by Cd, Cu, Zn and Pb in a decreasing order of toxicity ... Due to the high risk of biological damage posed by heavy metals from ... environmental safe limits or as the basis of sediment for 5-6 days to allow them standards aimed at protecting ...

  17. Toxicity of sediments from lead-zinc mining areas to juvenile freshwater mussels (Lampsilis siliquoidea) compared to standard test organisms

    Science.gov (United States)

    Besser, John M.; Ingersoll, Christopher G.; Brumbaugh, William G.; Kemble, Nile E.; May, Thomas W.; Wang, Ning; MacDonald, Donald D.; Roberts, Andrew D.

    2015-01-01

    Sediment toxicity tests compared chronic effects on survival, growth, and biomass of juvenile freshwater mussels (28-d exposures with Lampsilis siliquoidea) to the responses of standard test organisms—amphipods (28-d exposures with Hyalella azteca) and midges (10-d exposures with Chironomus dilutus)—in sediments from 2 lead–zinc mining areas: the Tri-State Mining District and Southeast Missouri Mining District. Mussel tests were conducted in sediments sieved to <0.25 mm to facilitate recovery of juvenile mussels (2–4 mo old). Sediments were contaminated primarily with lead, zinc, and cadmium, with greater zinc and cadmium concentrations in Tri-State sediments and greater lead concentrations in southeast Missouri sediments. The frequency of highly toxic responses (reduced 10% or more relative to reference sites) in Tri-State sediments was greatest for amphipod survival (25% of samples), midge biomass (20%), and mussel survival (14%). In southeast Missouri sediments, the frequency of highly toxic samples was greatest for mussel biomass (25%) and amphipod biomass (13%). Thresholds for metal toxicity to mussels, expressed as hazard quotients based on probable effect concentrations, were lower for southeast Missouri sediments than for Tri-State sediments. Southeast Missouri sites with toxic sediments had 2 or fewer live mussel taxa in a concurrent mussel population survey, compared with 7 to 26 taxa at reference sites. These results demonstrate that sediment toxicity tests with juvenile mussels can be conducted reliably by modifying existing standard methods; that the sensitivity of mussels to metals can be similar to or greater than standard test organisms; and that responses of mussels in laboratory toxicity tests are consistent with effects on wild mussel populations.

  18. The impact of anthropogenic pollution on limnological characteristics of a subtropical highland reservoir “Lago de Guadalupe”, Mexico

    Directory of Open Access Journals (Sweden)

    Sepulveda-Jauregui A.

    2013-08-01

    Full Text Available “Lago de Guadalupe” is an important freshwater ecosystem located in the northern part of the metropolitan area surrounding Mexico City, under high demographic pressure. It receives approximately 15 hm3·y-1 of untreated municipal wastewater from the surrounding municipalities. In order to develop a comparative assessment of the pollution effect over the limnological characteristics of Lago de Guadalupe, this lake was characterised from February 2006 to July 2009, and the results were compared with those obtained from a non-polluted lake “Lago el Llano” located in the same drainage area. Lago de Guadalupe was hypereutrophic with anoxic conditions throughout most of the water column. In contrast, Lago el Llano was mesotrophic with high dissolved oxygen concentrations throughout the entire water column with a clinograde profile. Both reservoirs had a monomictic mixing regime. The longitudinal zonation of physicochemical and biological variables were investigated in order to better understand the processes controlling the water quality across the reservoir during its residence time. This study shows the impact of anthropogenic pollution on the limnological characteristics of a subtropical reservoir and confirms that under adequate management schemes, namely avoiding pollution and wastewater discharges, subtropical reservoirs can be prevented from developing eutrophic conditions.

  19. A rapid phenol toxicity test based on photosynthesis and movement of the freshwater flagellate, Euglena agilis Carter

    International Nuclear Information System (INIS)

    Kottuparambil, Sreejith; Kim, Youn-Jung; Choi, Hoon; Kim, Mi-Sung; Park, Areum; Park, Jihae; Shin, Woongghi; Han, Taejun

    2014-01-01

    Highlights: • Rapid phenol toxicity tests (1 h) were developed based on Chl a fluorescence and the movement parameters of Euglena agilis. • Phenol significantly reduced F v /F m of PS II and rETRmax with EC50 values of 8.94 and 4.67 mM, respectively. • Among the movement parameters tested, velocity was the most sensitive biomarker with an EC50 of 3.17 mM. • The EC50 values for F v /F m , motility, and velocity appear to overlap the environmental permissible levels of phenol. - Abstract: Phenol, a monosubstituted aromatic hydrocarbon with various commercial uses, is a major organic constituent in industrial wastewaters. The ecotoxic action of phenol for aquatic environment is well known. In this study, rapid phenol toxicity tests (1 h) were developed based on chlorophyll a (Chl a) fluorescence and the movement parameters of the freshwater flagellate, Euglena agilis Carter. Phenol significantly reduced the maximum quantum yield (F v /F m ) of photosystem II (PS II) and the maximum photosynthetic electron transport rate (rETR max ) with median effective concentration (EC 50 ) values of 8.94 and 4.67 mM, respectively. Phenol reduced the motility and triggered change in the swimming velocity of the test organism. Among the parameters tested, velocity was the most sensitive biomarker with an EC 50 of 3.17 mM. The EC 50 values for F v /F m , motility, and velocity appear to overlap the permitted levels of phenol. In conclusion, the photosynthesis and movement of E. agilis can be fast and sensitive risk assessment parameters for the evaluation of phenol toxicity in municipal and industrial effluents

  20. A rapid phenol toxicity test based on photosynthesis and movement of the freshwater flagellate, Euglena agilis Carter

    Energy Technology Data Exchange (ETDEWEB)

    Kottuparambil, Sreejith [Institute of Green Environmental Research Center, Incheon National University, Incheon 406 840 (Korea, Republic of); Kim, Youn-Jung [Institute of Green Environmental Research Center, Incheon National University, Incheon 406 840 (Korea, Republic of); Department of Marine Science, Incheon National University, Incheon 406 840 (Korea, Republic of); Green-Pioneer (Ltd.), Incheon National University, Incheon 406 840 (Korea, Republic of); Choi, Hoon; Kim, Mi-Sung; Park, Areum; Park, Jihae [Institute of Green Environmental Research Center, Incheon National University, Incheon 406 840 (Korea, Republic of); Shin, Woongghi [Department of Biology, Chungnam University, Daejeon 306 764 (Korea, Republic of); Han, Taejun, E-mail: hanalgae@hanmail.net [Institute of Green Environmental Research Center, Incheon National University, Incheon 406 840 (Korea, Republic of); Department of Marine Science, Incheon National University, Incheon 406 840 (Korea, Republic of); Green-Pioneer (Ltd.), Incheon National University, Incheon 406 840 (Korea, Republic of)

    2014-10-15

    Highlights: • Rapid phenol toxicity tests (1 h) were developed based on Chl a fluorescence and the movement parameters of Euglena agilis. • Phenol significantly reduced F{sub v}/F{sub m} of PS II and rETRmax with EC50 values of 8.94 and 4.67 mM, respectively. • Among the movement parameters tested, velocity was the most sensitive biomarker with an EC50 of 3.17 mM. • The EC50 values for F{sub v}/F{sub m}, motility, and velocity appear to overlap the environmental permissible levels of phenol. - Abstract: Phenol, a monosubstituted aromatic hydrocarbon with various commercial uses, is a major organic constituent in industrial wastewaters. The ecotoxic action of phenol for aquatic environment is well known. In this study, rapid phenol toxicity tests (1 h) were developed based on chlorophyll a (Chl a) fluorescence and the movement parameters of the freshwater flagellate, Euglena agilis Carter. Phenol significantly reduced the maximum quantum yield (F{sub v}/F{sub m}) of photosystem II (PS II) and the maximum photosynthetic electron transport rate (rETR{sub max}) with median effective concentration (EC{sub 50}) values of 8.94 and 4.67 mM, respectively. Phenol reduced the motility and triggered change in the swimming velocity of the test organism. Among the parameters tested, velocity was the most sensitive biomarker with an EC{sub 50} of 3.17 mM. The EC{sub 50} values for F{sub v}/F{sub m}, motility, and velocity appear to overlap the permitted levels of phenol. In conclusion, the photosynthesis and movement of E. agilis can be fast and sensitive risk assessment parameters for the evaluation of phenol toxicity in municipal and industrial effluents.

  1. Dose-Time Effect of Crude Oil and Hydro-test Effluent on Freshwater ...

    African Journals Online (AJOL)

    The project therefore has provided a learning tool and a platform in evaluating the concentrations of the chemical and the duration of exposure required to produce the criterion effect. Moreover, test results validated the age long theory that 'the most important factor that determines the effect of any substance is the dose-time ...

  2. Results of Shipboard Approval Tests of Ballast Water Treatment Systems in Freshwater

    Science.gov (United States)

    2014-11-01

    standard. Concentrations of regulated organisms < 10 µm in minimum dimension (E. coli and Enterococcus spp.) were already below the discharge limit... enterococcus spp. *Tanks 3P and 4P were treated during Test Cycles 2 and 3... Enterococcus spp. (TCs 1 – 3 only) Core Time integrated from 19 L carboy 3 900 to 1000 mL Core (matrix blank) Time integrated from 19 L carboy 1

  3. Testing phylogenetic hypotheses of the subgenera of the freshwater crayfish genus Cambarus (Decapoda: Cambaridae.

    Directory of Open Access Journals (Sweden)

    Jesse W Breinholt

    Full Text Available The genus Cambarus is one of three most species rich crayfish genera in the Northern Hemisphere. The genus has its center of diversity in the Southern Appalachians of the United States and has been divided into 12 subgenera. Using Cambarus we test the correspondence of subgeneric designations based on morphology used in traditional crayfish taxonomy to the underlying evolutionary history for these crayfish. We further test for significant correlation and explanatory power of geographic distance, taxonomic model, and a habitat model to estimated phylogenetic distance with multiple variable regression.We use three mitochondrial and one nuclear gene regions to estimate the phylogenetic relationships for species within the genus Cambarus and test evolutionary hypotheses of relationships and associated morphological and biogeographical hypotheses. Our resulting phylogeny indicates that the genus Cambarus is polyphyletic, however we fail to reject the monophyly of Cambarus with a topology test. The majority of the Cambarus subgenera are rejected as monophyletic, suggesting the morphological characters used to define those taxa are subject to convergent evolution. While we found incongruence between taxonomy and estimated phylogenetic relationships, a multiple model regression analysis indicates that taxonomy had more explanatory power of genetic relationships than either habitat or geographic distance.We find convergent evolution has impacted the morphological features used to delimit Cambarus subgenera. Studies of the crayfish genus Orconectes have shown gonopod morphology used to delimit subgenera is also affected by convergent evolution. This suggests that morphological diagnoses based on traditional crayfish taxonomy might be confounded by convergent evolution across the cambarids and has little utility in diagnosing relationships or defining natural groups. We further suggest that convergent morphological evolution appears to be a common

  4. Biomedical Science Technologists in Lagos Universities: Meeting ...

    African Journals Online (AJOL)

    Biomedical Science Technologists in Lagos Universities: Meeting Modern Standards in Biomedical Research. ... biomedical techniques. SOTA biomedical science needs adequate financial investment for the scientific resources as well as stable civic infrastructure, thus these public institutions need more of such provisions.

  5. Auditing Autopsies: Lagos University Teaching Hospital Experience ...

    African Journals Online (AJOL)

    antemortem diagnosis) with autopsies (post-mortem diagnosis) on patients managed at Lagos University Teaching Hospital (LUTH) between October 1999 and November, 2000. In the study period, a total of 1843 deaths were registered out of which ...

  6. Behavioral pattern of commercial public transport passengers in Lagos metropolis

    Directory of Open Access Journals (Sweden)

    Oluwaseyi Joseph Afolabi

    2017-05-01

    Full Text Available This study examined the travel behavior of commercial public transport passengers in Lagos State, Nigeria. The descriptive research survey was used in order to assess the opinions of the respondents using the questionnaire. A total of 84 samples were used as representative population, while two null hypotheses were formulated and tested using the Pearson Product Moment Correlation Coefficient at 0.05 level of significant. The results that were obtained indicated that a positive correlation exists between frequency of   travel and commuters income in Lagos Metropolis and also that a positive correlation exists between frequency of travel and distance covered by commuters in Lagos Metropolis. Secondary data was also sourced to serve as complement to the primary data, thus allowing for a robust research. Descriptive statistical tools such as percentages were also adopted to present the socio-economic characteristics in the area. Findings showed that about 57% of sampled population are male, 62 % are civil servants, 48% of respondents travel for business purposes. Also, that majority of the respondents (50% said that the commercial public transport is highly prone to accident, while about 64% of the respondents commute on daily basis. It was established that lack of transport infrastructure coupled with poor road maintenance were seen as the leading causes of inaccessibility of the area.

  7. Uterine rupture at Lagos University Teaching Hospital

    OpenAIRE

    Omololu Adegbola; Adesumbo Kanyinsola Odeseye

    2017-01-01

    Background: Uterine rupture remains a major life-threatening obstetric disaster encountered in many developing countries and is associated with a high maternal and perinatal mortality and morbidity. Objectives: The objective of this study was to determine the incidence, associated risk factors, trend, clinical presentation, management as well as maternal and fetal outcome of uterine rupture at the Lagos University Teaching Hospital (LUTH), Lagos, Nigeria. Materials and Methods: This was a ret...

  8. Ecotoxicological assessment of the pharmaceutical compound Triclosan to freshwater invertebrates with emphasis to spiked sediment tests

    International Nuclear Information System (INIS)

    Pusceddu, Fabio Hermes

    2009-01-01

    The increasing of Pharmaceutical and Personal Care Products (PPCPs) occurrence in the aquatic environment cause adverse effects on the human health and aquatic communities. The environmental risk of the PPCPs associated with the possibility of synergic effects between PCPPs and the increase of the use of synthetic organic compounds, unchained a great concern on the toxic potential to biota aquatic. Triclosan (5-chloro-2-(2,4-dichlorophenoxy)-phenol) is a pharmaceutical compound widely used due your antibacterial mechanism effect, found in at least 932 products such as shampoos, toilet soaps, deodorants, lotions, toothpaste, detergents, socks and underwear, among others. Currently, studies about the Triclosan toxicity in the water and, mainly in the sediment, are poorly. We have the knowledge that the photodegradation of this product results into dichlorodibenzo-p-dioxin, and now it has great discussion on environmental agencies, like EPA, about the release or restriction of this product. The aim of this work is to assess the effects of Triclosan on mortality of insect larvae Chironomus xanthus and mortality and reproduction inhibition of microcrustacea Ceriodaphnia dubia exposed to Triclosan spiked sediments based on standard methods EPA and OECD. The EC50;96H obtained on acute toxicity tests with C. xanthus was 45,26 mg.Kg -1 . The chronic toxicity tests with C. dubia using spiked sediments were performed following the procedure in Burton and MacPherson (1995). A no-observed-effect concentrations and lowest-observed-effect concentration were 5,78 e 6,94 mg.Kg -1 , respectively. (author)

  9. Lagos bat virus transmission in an Eidolon helvum bat colony, Ghana.

    Science.gov (United States)

    Freuling, Conrad M; Binger, Tabea; Beer, Martin; Adu-Sarkodie, Yaw; Schatz, Juliane; Fischer, Melina; Hanke, Dennis; Hoffmann, Bernd; Höper, Dirk; Mettenleiter, Thomas C; Oppong, Samual K; Drosten, Christian; Müller, Thomas

    2015-12-02

    A brain sample of a straw-coloured fruit bat (Eidolon helvum) from Ghana without evident signs of disease tested positive by generic Lyssavirus RT-PCR and direct antigen staining. Sequence analysis confirmed the presence of a Lagos bat virus belonging to phylogenetic lineage A. Virus neutralization tests using the isolate with sera from the same group of bats yielded neutralizing antibodies in 74% of 567 animals. No cross-neutralization was observed against a different Lagos bat virus (lineage B). Copyright © 2015 Elsevier B.V. All rights reserved.

  10. Lagos Journal of Library and Information Science: About this journal

    African Journals Online (AJOL)

    Lagos Journal of Library and Information Science: About this journal. Journal Home > Lagos Journal of Library and Information Science: About this journal. Log in or Register to get access to full text downloads.

  11. Lagos Journal of Library and Information Science: Site Map

    African Journals Online (AJOL)

    Lagos Journal of Library and Information Science: Site Map. Journal Home > About the Journal > Lagos Journal of Library and Information Science: Site Map. Log in or Register to get access to full text downloads.

  12. Lagos Journal of Library and Information Science: Journal ...

    African Journals Online (AJOL)

    Lagos Journal of Library and Information Science: Journal Sponsorship. Journal Home > About the Journal > Lagos Journal of Library and Information Science: Journal Sponsorship. Log in or Register to get access to full text downloads.

  13. Incidence of Congenital Malaria at Delivery in Lagos. | Oluwole ...

    African Journals Online (AJOL)

    To determine the incidence of congenital malaria at delivery in Lagos, Nigeria. Thick smears were prepared from maternal, umbilical cord, placental blood and neonatal blood of five hundred consenting consecutive women at the time of delivery at the Lagos University Teaching Hospital (LUTH) and Lagos Island Maternity ...

  14. The Pattern Of Neurological Admissions At The Lagos University ...

    African Journals Online (AJOL)

    Objective: To determine the profile of neurological admissions at the Lagos University Teaching Hospital Methods: Neurological admission at the Lagos University Teaching Hospital, Lagos, Nigeria between 1995 and 1999 were reviewed using medical records. Result: Neurological admissions accounted for 19.635 of total ...

  15. LAGO: The Latin American giant observatory

    Science.gov (United States)

    Sidelnik, Iván; Asorey, Hernán; LAGO Collaboration

    2017-12-01

    The Latin American Giant Observatory (LAGO) is an extended cosmic ray observatory composed of a network of water-Cherenkov detectors (WCD) spanning over different sites located at significantly different altitudes (from sea level up to more than 5000 m a.s.l.) and latitudes across Latin America, covering a wide range of geomagnetic rigidity cut-offs and atmospheric absorption/reaction levels. The LAGO WCD is simple and robust, and incorporates several integrated devices to allow time synchronization, autonomous operation, on board data analysis, as well as remote control and automated data transfer. This detection network is designed to make detailed measurements of the temporal evolution of the radiation flux coming from outer space at ground level. LAGO is mainly oriented to perform basic research in three areas: high energy phenomena, space weather and atmospheric radiation at ground level. It is an observatory designed, built and operated by the LAGO Collaboration, a non-centralized collaborative union of more than 30 institutions from ten countries. In this paper we describe the scientific and academic goals of the LAGO project - illustrating its present status with some recent results - and outline its future perspectives.

  16. Different processes lead to similar patterns: a test of codivergence and the role of sea level and climate changes in shaping a southern temperate freshwater assemblage

    Science.gov (United States)

    2011-01-01

    Background Understanding how freshwater assemblages have been formed and maintained is a fundamental goal in evolutionary and ecological disciplines. Here we use a historical approach to test the hypothesis of codivergence in three clades of the Chilean freshwater species assemblage. Molecular studies of freshwater crabs (Aegla: Aeglidae: Anomura) and catfish (Trichomycterus arealatus: Trichomycteridae: Teleostei) exhibited similar levels of genetic divergences of mitochondrial lineages between species of crabs and phylogroups of the catfish, suggesting a shared evolutionary history among the three clades in this species assemblage. Results A phylogeny was constructed for Trichomycterus areolatus under the following best-fit molecular models of evolution GTR + I + R, HKY + I, and HKY for cytochrome b, growth hormone, and rag 1 respectively. A GTR + I + R model provided the best fit for both 28S and mitochondrial loci and was used to construct both Aegla phylogenies. Three different diversification models were observed and the three groups arose during different time periods, from 2.25 to 5.05 million years ago (Ma). Cladogenesis within Trichomycterus areolatus was initiated roughly 2.25 Ma (Late Pliocene - Early Pleistocene) some 1.7 - 2.8 million years after the basal divergences observed in both Aegla clades. These results reject the hypothesis of codivergence. Conclusions The similar genetic distances between terminal sister-lineages observed in these select taxa from the freshwater Chilean species assemblage were formed by different processes occurring over the last ~5.0 Ma. Dramatic changes in historic sea levels documented in the region appear to have independently shaped the evolutionary history of each group. Our study illustrates the important role that history plays in shaping a species assemblage and argues against assuming similar patterns equal a shared evolutionary history. PMID:22118288

  17. Different processes lead to similar patterns: a test of codivergence and the role of sea level and climate changes in shaping a southern temperate freshwater assemblage

    Directory of Open Access Journals (Sweden)

    Barber Brian R

    2011-11-01

    Full Text Available Abstract Background Understanding how freshwater assemblages have been formed and maintained is a fundamental goal in evolutionary and ecological disciplines. Here we use a historical approach to test the hypothesis of codivergence in three clades of the Chilean freshwater species assemblage. Molecular studies of freshwater crabs (Aegla: Aeglidae: Anomura and catfish (Trichomycterus arealatus: Trichomycteridae: Teleostei exhibited similar levels of genetic divergences of mitochondrial lineages between species of crabs and phylogroups of the catfish, suggesting a shared evolutionary history among the three clades in this species assemblage. Results A phylogeny was constructed for Trichomycterus areolatus under the following best-fit molecular models of evolution GTR + I + R, HKY + I, and HKY for cytochrome b, growth hormone, and rag 1 respectively. A GTR + I + R model provided the best fit for both 28S and mitochondrial loci and was used to construct both Aegla phylogenies. Three different diversification models were observed and the three groups arose during different time periods, from 2.25 to 5.05 million years ago (Ma. Cladogenesis within Trichomycterus areolatus was initiated roughly 2.25 Ma (Late Pliocene - Early Pleistocene some 1.7 - 2.8 million years after the basal divergences observed in both Aegla clades. These results reject the hypothesis of codivergence. Conclusions The similar genetic distances between terminal sister-lineages observed in these select taxa from the freshwater Chilean species assemblage were formed by different processes occurring over the last ~5.0 Ma. Dramatic changes in historic sea levels documented in the region appear to have independently shaped the evolutionary history of each group. Our study illustrates the important role that history plays in shaping a species assemblage and argues against assuming similar patterns equal a shared evolutionary history.

  18. Urban-Rural Temperature Differences in Lagos

    Directory of Open Access Journals (Sweden)

    Vincent N. Ojeh

    2016-05-01

    Full Text Available In this study, the hourly air temperature differences between City hall (urban and Okoafo (rural in Lagos, Nigeria, were calculated using one year of meteorological observations, from June 2014 to May 2015. The two sites considered for this work were carefully selected to represent their climate zones. The city core, City hall, is within the Local Climate Zone (LCZ 2 (Compact midrise while the rural location, Okoafo, falls within LCZ B (Scattered Trees in the south-western part on the outskirt of the city. This study is one of very few to investigate urban temperature conditions in Lagos, the largest city in Africa and one of the most rapidly urbanizing megacities in the world; findings show that maximum nocturnal UHI magnitudes in Lagos can exceed 7 °C during the dry season, and during the rainy season, wet soils in the rural environment supersede regional wind speed as the dominant control over UHI magnitude.

  19. Noise-Induced Hearing Loss in Laundry Workers in Lagos | Elias ...

    African Journals Online (AJOL)

    The noise levels and the effects of occupational noise exposure were determined in the students' hostels, administrative offices and the laundry department of Lagos University Teaching Hospital (LUTH). All 40 test subjects and 54 control had comprehensive otological screening and fulfilled other inclusion criteria.

  20. Ocular findings seen among the staff of an institution in Lagos, Nigeria

    African Journals Online (AJOL)

    Background:The degree to which ocular morbidity affects workers productivity in the developing countries has not been studied adequately. A federal government research institute based in Lagos introduced an annual health screen for all its workers, which included eye tests. This provided an opportunity to study the ...

  1. MICROORGANISMS ASSOCIATED WITH COMMERCIAL MOTORCYCLE HELMETS IN LAGOS METROPOLIS

    Directory of Open Access Journals (Sweden)

    Aniekpeno Elijah

    2012-04-01

    Full Text Available Microorganisms associated with commercial motorcycle helmets were investigated in the commercial city of Lagos, Nigeria. 300 motorcycle helmets were randomly collected from different commercial motor cyclists in two densely populated areas of Lagos: Yaba College of Technology (YABATECH and Lagos University Teaching Hospital (LUTH main gates respectively. Two sterile swabs moistened with sterile water were rotated over the inner surface of each helmet and cultured on MacConkey Agar and Nutrient Agar for bacterial growth and Sabouraud Dextrose Agar for fungi growth. The plates for bacteria growth were incubated aerobically at 37 ºC for 48 h, while plates for fungi at 28 ºC for 2 weeks. Biochemical tests were used to identify bacteria; while, cultural characteristics were used for fungi identification. The microorganisms consistently common to the samples investigated in the two locations were similar and included (with respective frequency of occurrence for both location: Staphylococcus aureus (80%; 7%, Pseudomonas aeruginosa (75%; 12%, Staphylococcus epidermis (60%; 8%, Enterobacter aerogenes (52%; 27%, Escherichia coli (40%; 13%, Bacillus spp (37%; 10%, Aspergillus spp (82%; 7%, Candida spp (55%; 22%, Rhizopus spp (40%; 27%, and Penicilium spp (35%; 12%. The motorcycle helmets collected at YABATECH had higher microbial colonization than LUTH irrespective of the isolates. This trend was similar for bacterial and fungi. Results showed that helmets could serve as vehicles for transmission of pathogens. Good hygiene practice (GHP and regular cleaning of motor cycle helmets with sterilants is strongly advocated in order to reduce the incidence of microbial transmission and its associated infection.

  2. Automated acquisition: principles and practice | Ezomo | Lagos ...

    African Journals Online (AJOL)

    No Abstract. Lagos Journal of Library and Information Science Vol. 1(2) 2003: 120-124. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. Article Metrics. Metrics Loading ... Metrics powered by PLOS ALM · http://dx.doi.org/10.4314/ljlis.v1i2.35486 · AJOL African Journals ...

  3. Lagos Journal of Library and Information Science

    African Journals Online (AJOL)

    Lagos Journal of Library and Information Science (LJLIS) aims to publish articles, short communications and conference reports which will: raise the level of awareness within the international library and information community of the potential for change and innovation; assist policy and decision-making in the medium term ...

  4. SITUACIÓN ACTUAL DEL ENTORNO DEL LAGO ARENAL

    OpenAIRE

    Araya García, Anabelle

    2013-01-01

    Los lagos y las lagunas son ecosistemas que pueden ser naturales o artificiales. El lago Arenal es un ejemplo de un ecosistema artificial que tiene múltiples y variados usos. Los lagos son susceptibles de sufrir modificaciones tanto por procesos naturales como por los inducidos por el hombre o antrópicos. En este estudio se procedió a evaluar el estado ambiental del lago Arenal y a señalar, clasificar y describir los principales problemas encontrados en el sitio. Se ofrecen además algunas con...

  5. Uterine rupture at Lagos University Teaching Hospital

    Directory of Open Access Journals (Sweden)

    Omololu Adegbola

    2017-01-01

    Full Text Available Background: Uterine rupture remains a major life-threatening obstetric disaster encountered in many developing countries and is associated with a high maternal and perinatal mortality and morbidity. Objectives: The objective of this study was to determine the incidence, associated risk factors, trend, clinical presentation, management as well as maternal and fetal outcome of uterine rupture at the Lagos University Teaching Hospital (LUTH, Lagos, Nigeria. Materials and Methods: This was a retrospective study of patients with uterine rupture at the LUTH, Idi-Araba, Lagos, Nigeria, from June 1, 2005 to May 31, 2013. The case records of patients in this period were retrieved from the medical health records department. The relevant data of sociodemographic characteristics, clinical presentation, management as well as maternal and perinatal outcome were collated using a structured questionnaire. Results: Of the 13,138 deliveries during the study period, there were eighty cases of uterine rupture giving a hospital incidence of 6.1/1000 deliveries. Patients with parities of 1 (28.36% and 2 (38.81% were identified to be at higher risk of uterine rupture. Previous caesarean section (46.28%, obstructed labor (26.87%, and injudicious use of oxytocin (16.42% were the common associated factors. Rupture along previous anterior scar was the most common site affected in 32.84%; repair with bilateral tubal ligation was the surgical procedure in most of the cases (47.76%. The case fatality rate for ruptured uterus was 11.94% for the mothers and the perinatal mortality rate of 791/1000 babies. Conclusion: Uterine rupture is a major cause of maternal and perinatal death in Lagos, Nigeria.

  6. Automated acquisition: principles and practice | Ezomo | Lagos ...

    African Journals Online (AJOL)

    No Abstract. Lagos Journal of Library and Information Science Vol. 1(2) 2003: 120-124. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/ljlis.v1i2.35486 · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians ...

  7. The Effect of Manpower Planning and Development in Lagos State (Nigeria Civil Service Performance

    Directory of Open Access Journals (Sweden)

    Chinyeaka J. Igbokwe-Ibeto

    2015-12-01

    Full Text Available The study examined effects of manpower planning and development in Lagos state civil service performance. Lagos state civil service is the greatest asset of the state in its quest for socio-economic development. The primary question that was explored is whether the nature of manpower planning and development curriculum in Lagos state civil service has effect on the service performance and the attainment of state objective. The study relied on primary and secondary data, and multiple stage sampling technique was used to select the sample population. The data collected was presented in frequency bar chart and simple percentage. Pearson’s Product Moment Correlation Coefficient (PPMC statistical tool was used to test the hypotheses. Findings of the study show that the nature of manpower planning and development curriculum has a positive effect on the Lagos state civil performance. It also reveals that the manpower planning and development has a positive effect on the attainment of Lagos state objective. To achieve better performance in the service, it should among others, improve on the current manpower planning strategy and continue to update its manpower development curriculum in line with the global best practices. Given the pivotal role that technology plays in the 21st century, the service should avail itself the windows of opportunities that information technology provides in its drive to enhance employees’ skills, knowledge and abilities that will invariably improve the service performance. Yet, the service should imbibe the prescripts of New PublicManagement theory (NPM, and that goals and targets should be defined and measurable as indicators of organizational performance.

  8. Breastfeeding practices of mothers of young children in Lagos, Nigeria

    African Journals Online (AJOL)

    Objective: To determine the breastfeeding practices (prevalence, initiation and exclusivity) of mothers of young children in Lagos. Methods: This was a communitybased, cross-sectional study carried out in 2010 in two Local Government Areas of Lagos State. Structured, intervieweradministered questionnaires were ...

  9. User education in tertiary institution in Nigeria | Osagie | Lagos ...

    African Journals Online (AJOL)

    A survey of library users from University of Lagos, Lagos State Polytechnic and Adeniran Ogunsanya College of Education was conducted between April and May, 2002 for their assessment of the User Education Programme. There were 300 respondents, 100 from each of three academic institutions. The criticisms ...

  10. The Politics of Urban Policies in Lagos, 1914 - 1960 | Davies ...

    African Journals Online (AJOL)

    Viewed from this perspective then, urban politics deals with the policies of urban government. Some studies on urbanisation in colonial Lagos, in the period under study have discussed urban policies among others, within the context of the advantages or benefits that Lagos derived from them. These studies argue that ...

  11. Perception of teenagers towards physical abuse in Lagos State ...

    African Journals Online (AJOL)

    This is a cross sectional survey research, which provided a quantitative investigation on the perception of teenagers towards physical abuse in Lagos State, Nigeria. Three hundred teenagers from secondary schools in Badagry division of Lagos State were purposively selected for this study. These secondary teenagers are ...

  12. Presentation and Management of Uterine Fibroids at the Lagos ...

    African Journals Online (AJOL)

    To review the clinical presentation and management of uterine fibroids at the Lagos University Teaching Hospital, Idi-Araba, Lagos. women with uterine fibroids that presented at the Gynaecological outpatient clinic were followed up till surgery and data on sociodemographic profile, parity, presenting signs and symptoms, ...

  13. Prevalence And Intensity Of Ectoparasites Of Livestock In Lagos ...

    African Journals Online (AJOL)

    ... intensity of livestock ectoparasites was highest in Mushin and Badagry areas. Health education was carried out as a strategy to control the prevalence of ectoparasites in Lagos areas. There was compliance to the health interventions. Keywords: kEctoparasites, Lagos, Ticks, Lice, prevalence, intensity. The Zoologist Vol.

  14. WIDENING THE TAX NET: LESSONS FROM LAGOS STATE ...

    African Journals Online (AJOL)

    Prof

    Abstract. Pressure is on governments all over the world to increase revenue through taxation in order to provide better services within their jurisdictions. This study attempts to access the Lagos state's revenue performance under the internally generated revenue scheme. Lagos state total revenue data was collected from ...

  15. The Receptivity of Prospective University Candidates in Lagos ...

    African Journals Online (AJOL)

    This study explored the receptivity of prospective university candidates in Lagos State, Nigeria, to distance learning. The study population comprised 1155 secondary school leavers enrolled in the Joint Admissions and Matriculation Board (JAMB) coaching centres in Lagos Mainland. The study was carried out in two ...

  16. Limb deformities: the Lagos, Nigeria experience | Adewole | Sahel ...

    African Journals Online (AJOL)

    Background: Individuals with various forms and degrees of limb deformities are common on the streets of Lagos, Nigeria. State-sponsored screening and surgical correction of the deformities were carried out in Lagos between June 2004 and May 2006. A report on the pattern of limb deformities is presented. Methods: This ...

  17. Glomus tumours of the Hand in Lagos, Nigeria

    African Journals Online (AJOL)

    DELL

    2Morbid Anatomy Department , College of Medicine , University of Lagos , P M B 12003 Surulere,. Lagos, Nigeria ... Though first described by Wood in 1812, it was Masson that accurately described the histopathology .... Glomus tumor- is an uncommon vascular tumour which is said to occur at any age , at any anatomical.

  18. Circulating Adipokine levels in Type 2 Diabetes Mellitus in Lagos ...

    African Journals Online (AJOL)

    Objective: This study was undertaken with the aim of investigating adipokine levels in the Type 2 Diabetes Mellitus. Methods: This is a cross sectional study conducted in Lagos University Teaching Hospital (LUTH), a-700 bed tertiary hospital centre in Lagos, Nigeria. 53 diabetic subjects and 27 non-diabetic controls with ...

  19. Building Collapse In Lagos State: Causes And Recommendations ...

    African Journals Online (AJOL)

    On Tuesday July 18th 2006 at 7.30 pm there was tears, sorrow and blood at Obute meta in Lagos as a four storey building housing thirty six flats and twenty five lock up shop collapsed killing atleast fifty seven people including children and pregnant women. In the recent past, Lagos had witnessed geometrical leap in the ...

  20. Widening the tax net: Lessons from Lagos State, Nigeria | Abiola ...

    African Journals Online (AJOL)

    Pressure is on governments all over the world to increase revenue through taxation in order to provide better services within their jurisdictions. This study attempts to access the Lagos state's revenue performance under the internally generated revenue scheme. Lagos state total revenue data was collected from 2009 to ...

  1. Autopsy findings in sickle cell disease patients in Lagos State ...

    African Journals Online (AJOL)

    Autopsy findings in sickle cell disease patients in Lagos State University Teaching Hospital, Ikeja, Lagos, Nigeria. ... The study showed that the most common cause of sudden death was anemia-related (50%) while 21% were due to acute infections, 18.4 % were due to cardiovascular events and 4.6% were due to ...

  2. Inventory of fisheries and fishes of the Lagos Lagoon, Lagos, Nigeria

    African Journals Online (AJOL)

    The systematic literature of fishes and fisheries in Lagos Lagoon is scattered, hence there is need for a comprehensive documentation of the diverse fish species that ... artisanal fishery, points to environmental degradation and possible changes in water quality with biological consequences for the biota in this environment.

  3. Freshwater Fish Communities

    Science.gov (United States)

    Freshwater fish are ecologically important in stream ecosystems, and they provide people with significant food, recreation, and conservation value as biological indicator of freshwater streams. Historically, the streams and rivers of southern New England supported moderately dive...

  4. Exploring Freshwater Science

    Indian Academy of Sciences (India)

    hydrological modifications on freshwater fish communities ... transformation on eco-hydrology. Freshwater ecosystems and associated habitats harbor incred- ible biodiversity. They offer various ecosystem services and sustain human livelihoods. However, due to ... complete their life cycle exclusively in the freshwater ...

  5. Tropical Freshwater Biology

    African Journals Online (AJOL)

    Tropical Freshwater Biology promotes the publication of scientific contributions in the field of freshwater biology in the tropical and subtropical regions of the world. One issue is published annually but this number may be increased. Original research papers and short communications on any aspect of tropical freshwater ...

  6. Murciélagos: nuestros vecinos

    OpenAIRE

    Lutz, María Ayelén; Merino, Mariano Lisandro

    2011-01-01

    Los murciélagos son los únicos mamíferos voladores y hay una gran diversidad de especies. Son esenciales para la ecología: los frugívoros, por ejemplo, colaboran en la regeneración de los bosques y los insectívoros controlan las poblaciones de insectos plagas. Se adaptan a diferentes hábitats y algunos incluso viven en ciudades. Tadarida brasiliensis es una especie insectívora que suele utilizar construcciones humanas como refugio. ¿Cómo protegerlo y a la vez evitar problemas de con...

  7. Malacofauna límnica da área de influência do lago da usina hidrelétrica de Serra da Mesa, Goiás, Brasil.: I. Estudo qualitativo Freshwater molluscs of the lake of Serra da Mesa dam, Goiás, Brazil.: I. Qualitative study

    Directory of Open Access Journals (Sweden)

    Silvana C. Thiengo

    2005-12-01

    conditions unique to particular projects, necessitate studies in each particular locality in order that appropriate preventive measures can be implemented. The increasing number of dams being built throughout Brazil is a problematic issue because these dams not only create conditions suitable for the establishment of the vector molluscs but also lead to increased permanent human settlement and tourism. The World Health Organization, as well as the Brazilian National Health Foundation, recommend a number of actions to prevent the establishment of schistosomiasis foci, including monitoring mollusc populations. This paper focuses on our work at Serra da Mesa dam, Goiás, where qualitative and quantitative surveys of the freshwater mollusc fauna have been undertaken during the period of 1997 to 2004, aiming mainly to investigate the occurrence and distribution of species of medical importance. Twenty-eight species, belonging to nine families, were found. In addition to documenting new records in the state this paper gives details of the distribution of the two species of medical importance, Biomphalaria straminea (Dunker, 1848 and Lymnaea columella Say, 1817, as well as the invasive freshwater species Corbicula fluminea (Müller, 1774 and Melanoides tuberculatus (Müller, 1774.

  8. Micronucleus test in erythrocytes of Barbus plebejus (Teleostei, Pisces) from two natural environments: a bioassay for the in situ detection of mutagens in freshwater.

    Science.gov (United States)

    Minissi, S; Ciccotti, E; Rizzoni, M

    1996-04-06

    Erythrocyte micronucleus frequencies in wild fish from two riverine environments and in fish reproduced and reared under controlled conditions (control group) were compared, with the aim to evaluate the suitability of the MN test for the in situ detection of mutagens in freshwaters. Fish were caught in different months in two rivers of central Italy which have different pollution levels. As indicator species, the barbel (Barbus plebejus) was chosen because of its ecological significance. Blood samplings were performed on wild fish immediately after capture and repeated at different time intervals on the same individuals, which were maintained in controlled conditions after capture. A total of 10,000 erythrocytes per specimen were scored. No significant differences in micronucleus frequencies were observed between the control group and fish from the unpolluted river (Mignone). A significantly higher frequency of micronuclei was observed in fish caught in the polluted river (Tiber), in comparison to both the controls and the Mignone river fish. No significant seasonal differences were observed. Barbels examined 50 and 100 days after capture presented a remarkable decrease in micronucleus frequency in comparison with the frequency observed in barbels at capture. The micronucleus test in fish erythrocytes was shown to be a sensitive bioassay for detecting mutagenic pollution in fresh water environments.

  9. Conceptualising megacities and megaslums in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Olayinka Akanle

    2017-09-01

    Full Text Available Burgeoning megacities is one of the fascinating realities of the 21st century global development. A huge chunk of individuals across the cosmos continue to crave for expansion of megacity space. Thus, living in a megacity is nothing short of psychosocial nirvana of many in the 21st century. With the growing appetite for increase in the number of megacities emanates issues of conterminous slumhood, gentrification, poverty, increasing crime rate and general hazards for lives and property. It is pertinent not to view megacity as an isolated phenomenon without considering its indelible flipside – megaslum. This article is devoted to intense analysis of pros and cons of the emergence of megacities using secondary data that were analysed in a triangulated manner. Pictorial data further complemented both theoretical and statistical information related in the work. Thus, using Lagos as an example, this article engaged the use of sociological imagination to x-ray how survival of megacities depends on a number of factors without which megacity becomes unsustainable. It is from this standpoint that the authors made useful recommendations to stakeholders in order to make Lagos megacity, and the likes, sustainable.

  10. Testing of Models for Predicting the Behaviour of Radionuclides in Freshwater Systems and Coastal Areas. Report of the Aquatic Working Group of EMRAS Theme 1

    International Nuclear Information System (INIS)

    2012-01-01

    During last decades a number of projects have been launched to validate models for predicting the behaviour of radioactive substances in the environment. Such projects took advantage from the great deal of experimental data gathered, following the accidental introduction of radionuclides into the environment (the accident at the Chernobyl power plant was the most obvious example), to assess the contamination levels of components of the ecosystem and of the human food chain. These projects stimulated intensive efforts for improving the reliability of the models aimed at predicting the migration of 137 Cs in lakes and of 137 Cs and 90 Sr in rivers. However, there are few examples of similar extensive model validation studies for other aquatic systems, such as coastal waters, or for other long lived radionuclides of potential radiological importance for freshwater systems. The validation of models for predicting the behaviour of radionuclides in the freshwater environment and coastal areas was the object of the EMRAS working group on testing of models for predicting the behaviour of radionuclides in freshwater systems and coastal areas. Five scenarios have been considered: (1) Wash-off of 90 Sr and 137 Cs deposits from the Pripyat floodplain (Ukraine). Modellers were asked to predict the time dependent water contamination of Pripyat River following the inundation of the river floodplain heavily contaminated following the Chernobyl accident. Available input data were the deposits of radionuclides in the floodplain, the time dependent contamination of water in the river entering the floodplain, the water fluxes and several other morphological, meteorological and hydrological data. Concentrations of radionuclides in the water of the River Prypiat down-stream of the floodplain were supplied to assess the performances of the models. (2) Radionuclide discharge from the Dnieper River (Ukraine) into its estuary in the Black Sea. Modellers were asked to predict the time

  11. Evaluation of groundwater resource of Amuwo-Odofin, Lagos State ...

    African Journals Online (AJOL)

    Odofin, Lagos State, Nigeria was carried out. The Direct Current Electrical Resistivity method of geophysical prospecting using the Schlumberger electrode configuration was adopted. The curve types obtained from the field data were 6 – layer ...

  12. Analysis of Fallopian Tubes seen in the Lagos State University ...

    African Journals Online (AJOL)

    , Ikeja, Lagos, Nigeria:- An Histopathological Survey. ... CONCLUSION: Tubal pregnancy is the commonest indication for sending fallopian tubes to the laboratories for analysis in 63.9% of cases. Malignant tumours of the fallopian tubes and ...

  13. FACTORS RESPONSIBLE FOR EXTRAMARITAL AFFAIRS AS PERCEIVED BY MARRIED ADULTS IN LAGOS, NIGERIA

    Directory of Open Access Journals (Sweden)

    Maureen Ogwokhademhe

    2013-07-01

    Full Text Available The study investigates factors responsible for extramarital affairs as perceived by married adults in Lagos metropolis. Extramarital affair has been described by many authors and scholars and has been identified as one of the causes of marital problem. Descriptive survey method was employed for this study and the population is all married adults in Lagos metropolis. A total number of 200 respondents were randomly selected in Lagos metropolis and a self developed instrument titled “Factors Responsible for Extramarital Affairs Questionnaire” (FAREAQ was used to collect relevant data from the respondents. Collected data were analyzed with both descriptive and inferential statistics. Descriptive static was employed for the personal data and research question and inferential statistic was used to analyze the hypotheses generated for the study. All hypotheses were tested at 0.05 alpha level. The major finding of the study revealed that “sex related factor” was perceived by married adults in Lagos metropolis to be the highest factor responsible for extramarital affair. Gender, age, religion and educational qualification of the factors responsible for extra marital affairs while family type of the respondents did not influence their perception. Implications of the findings to guidance and counselling therefore is that counselling (Guidance services should be extended to families so as to educate parents on the effects of extramarital affair on marriage and on the children and also for counsellors to emphasize the effectiveness of “sex” in marital relationship. Based on the findings of the study, it was therefore recommended that counsellors should organize continuously on the mass media enlightenment programme on the various factors responsible for extramarital affairs so that couples can learn and work on themselves to secure their marriage.

  14. Utilization of Oral Health Care Services by University Undergraduates in Lagos, Nigeria.

    Science.gov (United States)

    Makanjuola, J O; Uti, O G; Sofola, O O

    2015-01-01

    Data on the utilization of the available oral health facilities by university undergraduates is scarce in Nigeria. To determine the level of utilization of oral health care services and to identify the barriers to seeking treatment among University of Lagos students. A cross-sectional survey was carried out among University of Lagos undergraduates. Systematic sampling was used to select participants after randomly selecting a male and female hostel. Self-administered questionnaires were distributed to participants and collected immediately. The data was analyzed using Epi info version 6.04 software. Statistical significance was evaluated with chi square test and p-value undergraduate education, and the faculty of these students and their level of utilization of oral health care services. A high proportion of respondents that had attended the dental clinic went for dental checkup (33.6%) and extractions (30.9%).The major barriers to receiving dental treatment was a lack of perceived need for dental treatment (53.1%) followed by lack of time (27.1%), fear/anxiety (18.2%) and cost of treatment (18.2%). The low level of utilization among the undergraduates in Lagos, Nigeria shows that there is need for greater oral health awareness among the students, thereby increasing the use of oral health care facilities.

  15. Methods for preparing synthetic freshwaters.

    Science.gov (United States)

    Smith, E J; Davison, W; Hamilton-Taylor, J

    2002-03-01

    Synthetic solutions that emulate the major ion compositions of natural waters are useful in experiments aimed at understanding biogeochemical processes. Standard recipes exist for preparing synthetic analogues of seawater, with its relatively constant composition, but, due to the diversity of freshwaters, a range of compositions and recipes is required. Generic protocols are developed for preparing synthetic freshwaters of any desired composition. The major problems encountered in preparing hard and soft waters include dissolving sparingly soluble calcium carbonate, ensuring that the ionic components of each concentrated stock solution cannot form an insoluble salt and dealing with the supersaturation of calcium carbonate in many hard waters. For acidic waters the poor solubility of aluminium salts requires attention. These problems are overcome by preparing concentrated stock solutions according to carefully designed reaction paths that were tested using a combination of experiment and equilibrium modeling. These stock solutions must then be added in a prescribed order to prepare a final solution that is brought into equilibrium with the atmosphere. The example calculations for preparing hard, soft and acidic freshwater surrogates with major ion compositions the same as published analyses, are presented in a generalized fashion that should allow preparation of any synthetic freshwater according to its known analysis.

  16. Archives: Tropical Freshwater Biology

    African Journals Online (AJOL)

    Items 1 - 23 of 23 ... Archives: Tropical Freshwater Biology. Journal Home > Archives: Tropical Freshwater Biology. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register · Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives. 1 - 23 of 23 Items ...

  17. The freshwater biodiversity crisis

    African Journals Online (AJOL)

    group of native fishes, the cyprinids, still persist in many of the country's freshwaters. This paper combines review of ... Key words/phrases: Deforestation, Ethiopia, fish diversity, freshwater ecosystems, introduced species ...... Stomach pH, feeding rhythm and ingestion rate in Oreo- chromis niloticus L. (Pisces: Cichlidae) in ...

  18. Design and analysis of a natural-gradient ground-water tracer test in a freshwater tidal wetland, West Branch Canal Creek, Aberdeen Proving Ground, Maryland

    Science.gov (United States)

    Olsen, Lisa D.; Tenbus, Frederick J.

    2005-01-01

    A natural-gradient ground-water tracer test was designed and conducted in a tidal freshwater wetland at West Branch Canal Creek, Aberdeen Proving Ground, Maryland. The objectives of the test were to characterize solute transport at the site, obtain data to more accurately determine the ground-water velocity in the upper wetland sediments, and to compare a conservative, ionic tracer (bromide) to a volatile tracer (sulfur hexafluoride) to ascertain whether volatilization could be an important process in attenuating volatile organic compounds in the ground water. The tracer test was conducted within the upper peat unit of a layer of wetland sediments that also includes a lower clayey unit; the combined layer overlies an aquifer. The area selected for the test was thought to have an above-average rate of ground-water discharge based on ground-water head distributions and near-surface detections of volatile organic compounds measured in previous studies. Because ground-water velocities in the wetland sediments were expected to be slow compared to the underlying aquifer, the test was designed to be conducted on a small scale. Ninety-seven ?-inch-diameter inverted-screen stainless-steel piezometers were installed in a cylindrical array within approximately 25 cubic feet (2.3 cubic meters) of wetland sediments, in an area with a vertically upward hydraulic gradient. Fluorescein dye was used to qualitatively evaluate the hydrologic integrity of the tracer array before the start of the tracer test, including verifying the absence of hydraulic short-circuiting due to nonnatural vertical conduits potentially created during piezometer installation. Bromide and sulfur hexafluoride tracers (0.139 liter of solution containing 100,000 milligrams per liter of bromide ion and 23.3 milligrams per liter of sulfur hexafluoride) were co-injected and monitored to generate a dataset that could be used to evaluate solute transport in three dimensions. Piezometers were sampled 2 to 15 times

  19. Factors influencing CD4 cell count in HIV-positive pregnant women in a secondary health center in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Akinbami AA

    2015-04-01

    Full Text Available Akinsegun A Akinbami,1 Abidoye Gbadegesin,2 Sarah O Ajibola,3 Ebele I Uche,1 Adedoyin O Dosunmu,1 Adewumi Adediran,4 Adekunle Sobande2 1Department of Haematology and Blood Transfusion, 2Department Of Obstetrics and Gynaecology, College of Medicine, Lagos State University, Ikeja, Lagos, Nigeria; 3Department of Haematology and Immunology, Ben-Carson School of Medicine, Babcock University, Ilisan, Ogun State, Nigeria; 4Department of Haematology and Blood Transfusion, Faculty of Clinical Sciences, College of Medicine, University of Lagos, Lagos, Nigeria Background: Immunity in pregnancy is physiologically compromised, and this may affect CD4 count levels. It is well-established that several factors affect CD4 count level in pregnancy. This study aimed to determine the mean and reference range of CD4 count in human immunodeficiency virus (HIV-positive pregnant women in Lagos, Nigeria. Methods: A retrospective study was carried out at antenatal clinics of the Maternal and Child Center of a secondary health center in Lagos State, Nigeria. Records of HIV-positive pregnant women at various gestational ages, including CD4+ cell count at booking, packed cell volume (PCV at booking and labor, gestational age at delivery, and infant weight and sex were retrieved. The descriptive data was given as mean ± standard deviation (SD. Pearson's chi-squared test and correlation were used for analytical assessment. Results: Data were retrieved for a total of 143 patients. The mean age was 31.15±3.78 years. The mean PCV was 31.01%±3.79% at booking and 30.49%±4.80% during labor. The mean CD4 count was 413.87±212.09 cells/µL, with a range of 40 to 1,252 cells/µL. The mean infant weight was 3.05±0.45 kg, with a range of 2 to 5 kg. Age of the mother, gestational age, and PCV at booking were not statistically significantly associated with CD4 count. Conclusion: Maternal age, gestational age, and PCV at booking had no significant effects on CD4+ cell count levels in

  20. TEMPOROMANDIBULAR PAIN DYSFUNCTION SYNDROME IN PATIENTS ATTENDING LAGOS UNIVERSITY TEACHING HOSPITAL, LAGOS, NIGERIA.

    Science.gov (United States)

    Eweka, O M; Ogundana, O M; Agbelusi, G A

    2016-01-01

    Temporomandibular joint pain dysfunction syndrome (TMJPDS) is the most common temporomandibular disorder. This condition presents with symptoms of pain, restricted jaw movement and joint noise. Other symptoms include otalgia, headache, neck pain and trismus. To determine the pattern of Temporomandibular joint pain dysfunction syndrome patients managed at the Lagos University Teaching Hospital, Lagos, Nigeria. A descriptive study of patients with signs and symptoms of Temporomandibular joint pain dysfunction syndrome attending the Oral Medicine Clinic of Lagos University Teaching Hospital. Twenty-one patients with Temporomandibular joint pain dysfunction syndrome were enrolled into the study, out of which 10(48%) were females and 11(52%) were males. The age range was 23-81years with a mean of 45.2 ± 18.9 years. Majority of the patients 20(95.2%) complained of pain around the joint, in the pre-auricular region, in the muscles of mastication and the ear. While 7(35%) complained of clicking sounds, 10(47.6%) complained of pain on mouth opening and during mastication only. In all 5(23.8%) had impaired movement of the jaws, mouth opening was normal in 18(85.7%) but reduced in 3(14.3%) patients. Over half of patients 12(57%) experienced clicking sounds, there was tenderness around the temporomandibular joint in 16(76.2%) cases, pain in the ear of 7(33.3%) patients and 13(61.9%) people presented with tenderness of the muscles of mastication. Conservative management of all the cases resulted in resolution of the symptoms. Temporomandibular joint pain dysfunction syndrome has diverse clinical presentation and though distressing, it responds to prompt and effective conservative management.

  1. Exploring Freshwater Science

    Indian Academy of Sciences (India)

    Freshwater ecosystems and associated habitats harbor incrediblebiodiversity. They offer various ecosystem services andsustain human livelihoods. However, due to increasing developmentalpressure and rising water demand, these systemsare under huge threat. As a result, many aquatic species arefeared to become ...

  2. Evaluación de la contaminación en el lago Titicaca

    OpenAIRE

    Ministerio de Agricultura; Instituto Nacional de Recursos Naturales. Dirección General de Áreas Naturales Protegidas

    1996-01-01

    Contiene una relación de informes relacionados a la contaminación del lago Titicaca, tales como: Evaluación de la contaminación en el lago Titicaca y Evaluación ambiental del problema de contaminación que afecta al lago Titicaca (ambos de de setiembre de 1996), Informe sobre la grave contaminación ambiental que está afectando el lago Titicaca (marzo de 1996) y el Plan para descontaminar las aguas del lago Titicaca, Bahía Interior de Puno (julio de 1996).

  3. Usefulness of Routine Antibacterial Susceptibility Testing Results for ...

    African Journals Online (AJOL)

    The objective was to evaluate the usefulness and reliability of routine antibacterial susceptibility testing data in antibacterial resistance surveillance in Lagos Metropolis. The antibacterial susceptibility testing results of 3,961 clinical isolates of bacteria from four highly rated hospitals in Lagos metropolis were collated and ...

  4. Freshwater and fish

    International Nuclear Information System (INIS)

    Saxen, R.

    1997-01-01

    Severe radioactive contamination of the freshwater environment could have serious consequences for both drinking water and fish. Most of the Nordic countries have an abundance of freshwater lakes and rivers. Finland alone has about 56,000 lakes, each with a surface area of 1 hectare or more. Nearly 10% of Finland's surface is covered with lakes and rivers. In Sweden, about 9% of the surface area is freshwater, in Norway about 5%, and in Denmark only about 2%. Freshwater plays a minor role in Iceland, but even there numerous rivers discharge from the volcanic soils to the Ocean. Cs-137 and 90 Sr are likely to be the most important radionuclides with respect to long term radioactive contamination of freshwater. If radioactive deposition occurs in the absence of snow and ice radionuclides will contaminate the surface water directly and may rapidly enter the aquatic food chain. Fish which eat contaminated plankton become contaminated almost immediately. Deposition during summer increases the transfer for radionuclides to fish since fish metabolism is faster during the warm season. During the cold period, fish metabolism is slow and thus uptake and excretion of radiocaesium are also slow. (EG)

  5. Freshwater Megafauna: Flagships for Freshwater Biodiversity under Threat.

    Science.gov (United States)

    Carrizo, Savrina F; Jähnig, Sonja C; Bremerich, Vanessa; Freyhof, Jörg; Harrison, Ian; He, Fengzhi; Langhans, Simone D; Tockner, Klement; Zarfl, Christiane; Darwall, William

    2017-10-01

    Freshwater biodiversity is highly threatened and is decreasing more rapidly than its terrestrial or marine counterparts; however, freshwaters receive less attention and conservation investment than other ecosystems do. The diverse group of freshwater megafauna, including iconic species such as sturgeons, river dolphins, and turtles, could, if promoted, provide a valuable tool to raise awareness and funding for conservation. We found that freshwater megafauna inhabit every continent except Antarctica, with South America, Central Africa, and South and Southeast Asia being particularly species rich. Freshwater megafauna co-occur with up to 93% of mapped overall freshwater biodiversity. Fifty-eight percent of the 132 megafauna species included in the study are threatened, with 84% of their collective range falling outside of protected areas. Of all threatened freshwater species, 83% are found within the megafauna range, revealing the megafauna's capacity as flagship and umbrella species for fostering freshwater conservation.

  6. DNA barcoding of South Africa's ornamental freshwater fish – are ...

    African Journals Online (AJOL)

    DNA barcoding of South Africa's ornamental freshwater fish – are the names reliable? ... African Journal of Aquatic Science ... Because its effective implementation requires accurate identification, the aim of the present study was to test whether DNA barcoding is a useful tool to identify freshwater fishes in the South African ...

  7. Geophysical study of saline water intrusion in Lagos municipality

    African Journals Online (AJOL)

    aghomotsegin

    Saline water intrusion presently constitutes serious concerns in the Lagos municipality just like many other coastal cities, thus necessitating its intervallic study. The present study involving 52 borehole logs (consisting of natural gamma and electrical resistivity components) was aimed at delineating intruded and vulnerable ...

  8. Bacteriology of sachet water sold in Lagos, Nigeria | Egwari | East ...

    African Journals Online (AJOL)

    Objectives: To investigate the health risks associated with methods of hawking of sachet water in the streets of Lagos. Design: Eight brands of sachet water were collected from four different receptacles; unopen packs from factory, pail and wheelbarrow containing ice-blocks as coolants, and domestic refrigerators. Bacterial ...

  9. Department of Estate Management, University of Lagos, Akoka ...

    African Journals Online (AJOL)

    USER

    2015-02-13

    Feb 13, 2015 ... most critical issues that determined land accessibility among urban crop farmers in the Lagos metropolis were in the following ... Thus, availability and usability were not the most critical issues in urban crop farming. Also, publicly-owned lands .... have lost their paid jobs. The ubiquity of urban farming has ...

  10. Comparative Study of Teenage Pregnancy in Lagos State University ...

    African Journals Online (AJOL)

    This informed a comparative study of the obstetric performance of primiparous teenagers and nonteenage primiparas within a two-year period (1st January, 2006-31st December, 2007) in Lagos State University Teaching Hospital,Ikeja. Fifty six(56) case notes of teenagers who delivered in this hospital were available for ...

  11. Ectopic Pregnancy in Lagos State University Teaching Hospital ...

    African Journals Online (AJOL)

    We set out to determine the socio-demographic factors,pattern of presentation and management of ectopic pregnancy in a University Teaching Hospital in Lagos, Nigeria. A retrospective descriptive analysis of all cases of ectopic pregnancy over a 2-year period was carried out. The case notes were retrieved from the ...

  12. A Visionary of the Lagos Muslim Community: Mustapha Adamu ...

    African Journals Online (AJOL)

    While such biographies cut across religio-cultural boundaries, it seems clear that biographies on Muslim personalities, most especially at the local level, deserve more attention. This is why this study is on Mustapha Adamu Animashaun, who influenced the lives of Muslims and non-Muslims alike in Lagos during the first half ...

  13. Cost of Care Among Patients With Pulmonary Tuberculosis in Lagos ...

    African Journals Online (AJOL)

    Tuberculosis (TB) is a global health challenge. Currently it is the 7th leading cause of death worldwide, and Nigeria ranks fourth amongst 22 high-burden countries for the disease. This study sought to appraise the direct and indirect costs borne by TB patients attending the Chest Clinics at the Lagos State University ...

  14. Evaluation of polybrominated diphenyl ethers in sediment of Lagos ...

    African Journals Online (AJOL)

    These highly hazardous organic pollutants of concern are persistent, can bioaccumulate and biomagnify in aquatic organism especially fish, and there appears to be no clear strategy for managing them. In this study, levels of polybrominated diphenyl ethers were determined in sediments collected from Lagos lagoon with ...

  15. Breastfeeding practices of mothers of young children in Lagos, Nigeria

    African Journals Online (AJOL)

    PROF. EZECHUKWU

    2013-06-23

    Jun 23, 2013 ... ing birth weight, method of delivery, birth order, and the use of pacifiers.13,14. This study therefore, examines breast-feeding practices among mothers in Lagos state Nigeria, specifically breastfeeding prevalence, initiation and exclusivity. The result will be useful to health educators, policy makers and other ...

  16. Attitude and Perceptions of Clinicians in Lagos to Autopsy Practice ...

    African Journals Online (AJOL)

    Using pretested questionnaire instrument, a cross sectional survey of clinicians working in the Lagos University Teaching Hospital to obtain their attitudes and perception towards autopsy practice. 230 questionnaires were administered and the response rate was 80.7% . 41.5% of respondents often requested for autopsy.

  17. Urban agriculture in metropolitan Lagos: An inventory of potential ...

    African Journals Online (AJOL)

    However, the benefit of urban farming is hinged on availability of productive land and water resources for this economic group. In Lagos, the land ownership system ... Keywords: Ecological carrying capacity, ecological city (eco-city), ecological footprint, urban agriculture, urban planning. Eastern Africa Journal of Rural ...

  18. The Artists of the Universal Studios of Art, Lagos, Nigeria

    African Journals Online (AJOL)

    Nneka Umera-Okeke

    Art flourished with the contributions of, mostly, schools, workshops and studios spread around the country. The Universal Studios of Art, Lagos happened to be a stakeholder to the growth of art professionalism for more than fifteen years. The studios accommodated sculpture, painting, metal design, graphics and ceramics.

  19. 236 Effective Social Work Practice in Lagos: An Emerging

    African Journals Online (AJOL)

    User

    2010-10-17

    Oct 17, 2010 ... Ayangunna, James A. - Department of Social Work, Faculty of Education,. University of Ibadan, Ibadan, ... health, mental health, care for the aged, informal education, social planning and development. .... Islamic and other faiths who have not always managed to co-exist peacefully. (Collier, 2007). Lagos, as ...

  20. Scintigraphic analysis of thyroid diseases at the Lagos University ...

    African Journals Online (AJOL)

    This paper presents a retrospective analysis of randomly selected clinical scintigraphic records at the College of Medicine/Lagos University Teaching Hospital, Nigeria. Out of the 436 patients scanned for various thyroid abnormalities, 266 (61.0%) were used for the analysis due to insufficient data and parameters required ...

  1. Childhood mortality in children emergency centre of the Lagos ...

    African Journals Online (AJOL)

    Childhood mortality in children emergency centre of the Lagos University Teaching hospital. ... commonest conditions accounting for 22.6%, 16.3%, 12.1% and 9.9% of deaths respectively. Conclusion: Childhood mortality in LUTH is still high with majority of deaths occurring in infancy especially in the neonatal period.

  2. Lago Agrio (Nueva Loja), Ecuador: A Strategic Black Spot?

    Science.gov (United States)

    2013-03-01

    there will be an additional 18,000 asylum seekers entering the border regions annually.53 25 The Lago Agrio region receives the largest influx...refuge in Ecuador over the past decade. By the end of 2012, there were 55,791 who officially seeked asylum and. 98 percent of these recognized

  3. The Prevalence of Cardiovascular Disease in the Lagos State, Nigeria

    African Journals Online (AJOL)

    The analysis, which examines the prevalence of cardiovascular diseases (ICD 9: 390-459) in Lagos State of Nigeria, was based on records obtained from the register of deaths in four Local Government Areas of the State. The result shows that there is general increase in death rates due to cardiovascular diseases over the ...

  4. Management of Records in Public Secondary Schools of Lagos ...

    African Journals Online (AJOL)

    This article investigated management of records in public secondary schools of Lagos State, Nigeria. Simple random sampling technique with questionnaire, observation and interview methods were usedfor data collection through ten research assistants. 257 school managers (principals) were randomly sampledfrom a ...

  5. 459 Road Transport System Management and Traffic in Lagos ...

    African Journals Online (AJOL)

    User

    2010-10-16

    Oct 16, 2010 ... Road transport is a catalyst of urban, rural and national development. It is a catalyst by facilitating the ... planning and operating a system of urban highway and street network. It arises from the need to ..... Source: Master Plan Project, Urban and Regional Planning Division, Lagos. State Ministry of Economic ...

  6. Personnel Recruitment and Retention Strategies in Lagos State Civil ...

    African Journals Online (AJOL)

    Lagos State Civil Service (LSCS) exists to implement policies of government. To realize this goal, personnel are needed, which are products of personnel recruitment and retention strategies (PR & RSs) of the civil service (CS). This study empirically examined personnel recruitment and retention strategies in LSCS.

  7. Prevalence and trends in breast cancer in Lagos state, Nigeria ...

    African Journals Online (AJOL)

    The study examined the trends in the prevalence of breast cancer in Lagos State, Nigeria. A sample of 1000 subjects was taken from a population consisting of women between the ages of 15 and 60 years spread across the 20 Local Government Areas (LGAs) of the State. Fifty questionnaires were distributed in each LGA.

  8. Polychlorinated biphenyl in fish samples from Lagos Lagoon, Nigeria

    African Journals Online (AJOL)

    STORAGESEVER

    2009-06-17

    Jun 17, 2009 ... Several fish samples from the Lagos lagoon, Nigeria were analyzed for the presence of polychlorinated biphenyls (PCBs). The fish species analyzed include Tilapia zilli (red belly Tilapia), Ethmalosa fimbriata. (Bonga shad) and Chrysichthys nigrodigitatus (catfish). Eight PCB congeners were identified and.

  9. Development Control in Lagos State: an Assessment of Public ...

    African Journals Online (AJOL)

    This submission also contains an assessment of the town planning regulation, level of compliance to building regulation and technical skills of personals monitoring compliance to space standards as specified by Urban and Regional Planning Law Decree 88 of 1992, the Lagos Planning Law of 2005 and under the Urban ...

  10. Road Traffic Accident Variations in Lagos State, Nigeria: A Synopsis ...

    African Journals Online (AJOL)

    The major objective of this research is to examine the variation patterns of road traffic accident in Lagos State. The study used mostly secondary data; accident records and vehicular situation were obtained from the Nigeria police force and Federal Road Safety Commission. The data were obtained for a period of thirty two ...

  11. Gender and Campus Violence: A Study of University of Lagos ...

    African Journals Online (AJOL)

    This research is an attempt to investigate the incidence of violence among university students using University of Lagos as a case study. A questionnaire on different kinds of violence was administered to 446 students of the university. In addition, four focus group discussion sessions were conducted to assess the types of ...

  12. Degradation of Aroclor 1221 by microbial populations of the Lagos ...

    African Journals Online (AJOL)

    SERVER

    2007-10-18

    Oct 18, 2007 ... Samples obtained from three locations in the Lagos lagoon were studied for the effect of Aroclor 1221 on their population dynamics. In all three cases, both control and experimental microcosms showed slight increases between day 5 and day 10 with the highest value of 4 × 1010 cfu/ml in control and 1.2 ×.

  13. Comparative demand analysis for rice in Edo, delta and Lagos ...

    African Journals Online (AJOL)

    The study examined the comparative demand analysis for rice types in Edo, Delta and Lagos states of Nigeria. A multi-stage sampling procedure, involving four stages, was used to select eight hundred and twelve (812) households. Data collected were analysed using both descriptive and inferential statistics. The results of ...

  14. Personnel Recruitment and Retention Strategies in Lagos State Civil ...

    African Journals Online (AJOL)

    Nekky Umera

    The results show that the strategy for personnel recruitment into the CS is based on .... Thompson, Gamble and Strickland (2004), see strategy as a game plan which ..... Education. Lagos State Education Ministry implemented the programme of Unified. Internal Examination for students in the public secondary schools. The.

  15. A Review of Nosocomial Infection at the Lagos university Teaching ...

    African Journals Online (AJOL)

    The infection control program of the Lagos Universityteaching hospital was started in 1974 with an Infection Control team reporting to an Infection Control Committee. There is currently no functioning Infection Control Committee. An analysis of data of a hospital- wide surveillance obtained between November 1993 ...

  16. Islam and Hausa Culture | Adeleke | Lagos Historical Review

    African Journals Online (AJOL)

    Although Islam is not indigenous to Hausaland it has, along with the Hausa language, become the most distinguishing feature of Hausa culture. The article interrogates the historical processes that led to the Islamisation of Hausa culture. Lagos Historical Review, vol. 5 (2005), 99-110 ...

  17. Quality evaluation of yogurts produced commercially In Lagos, Nigeria

    African Journals Online (AJOL)

    Yogurt of the natural-stirred and pineapple-stirred varieties manufactured commercially in Lagos, Nigeria were analyzed to evaluate the nutritional quality of the fresh and stored product. The carbohydrate and protein contents were higher in the pineapple than in natural yogurt with an average percent content of 12.7 and ...

  18. A prospective study of Vitamin A Utilization in Lagos, Nigeria ...

    African Journals Online (AJOL)

    Also, drug utilization studies are primary in establishing mechanisms to promote the use of this vitamin. Hence, we investigated the use of Vitamin A in 4 referral paediatric units in Lagos, Nigeria. The study was prospective with the use of questionnaires administered to those patients placed on Vitamin A therapy among 380 ...

  19. MUSIC EDUCATION AND MUSICAL ACTIVITIES IN LAGOS: THEN ...

    African Journals Online (AJOL)

    different musical genres especially, commercial ones keep emerging. Lagos being the nation's centre of social and economic activities is always the first place of call to harbour such musical activities. However, most of the musical activities of the first periods still exist, though in a modern way. Commercial dance music ...

  20. Paediatric Hand Injuries At The Lagos University Teaching Hospital ...

    African Journals Online (AJOL)

    Background: Paediatric hand trauma represents a subset of hand injury that can be quite challenging to manage. Local studies on this injuries are few therefore a 4 year retrospective study at the Trauma and hand rehabilitation unit of the Lagos University teaching hospital was carried out. Objectives: To determine the ...

  1. Traditional Music and Dance: An Appreciation | Adedeji | Lagos ...

    African Journals Online (AJOL)

    Lagos Notes and Records. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 17 (2011) >. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register. DOWNLOAD FULL TEXT Open Access DOWNLOAD FULL TEXT ...

  2. Assessment of tree species diversity in the University of Lagos ...

    African Journals Online (AJOL)

    This study was aimed at assessing and providing management options for tree species growing on Akoka Campus of University of Lagos, Southern-Western Nigeria by collecting data from four (4) randomly selected 50m x 50m plots in the study area. The assessment was carried out through extensive field survey with the ...

  3. Prognostic Factors Of Typhoid Perforation in Lagos | Atoyebi ...

    African Journals Online (AJOL)

    Prognostic Factors Of Typhoid Perforation in Lagos. OA Atoyebi, AA Adesanya, CE Atimomo, JT Da Roche- Afodu. Abstract. Perforation of the ileum remains one of the commonest and the most dramatic complication of Typhoid fever in developing countries where the infection is still prevalent. A prospective study of patients ...

  4. Distribution pattern of enteric organisms in the Lagos Lagoon, Nigeria

    African Journals Online (AJOL)

    A wide range of organisms was encountered in the 24 sampled sites of the Lagos Lagoon. The enteric gram-negative shortrods, Lactose fermenting organisms such as Klebsiella spp, Enterobacter spp and Escherichia coli were prevalent in most of the Lagoon sites studied. The in vitro antibiotic sensitivity profile of the ...

  5. STRUCTURAL PATTERN OF MOBILE PHONE USAGE IN LAGOS ...

    African Journals Online (AJOL)

    Osondu

    2012-10-04

    Oct 4, 2012 ... judicious provision of telecommunication facilities. Telecommuting takes place in Lagos metropolis with the relatively recent telecommunication technology GSM used to substitute the home office business, social and recreational trips. This has become a weapon in conserving physical energy as well as to ...

  6. Carcinoma of the Penis: Experience from the Lagos University ...

    African Journals Online (AJOL)

    Background: Carcinoma of penis is rare in countries where neonatal male circumcision is the tradition and in Nigeria it is a common practice amongst almost all the tribes. Objective: This is to document the prevalence, age distribution, site and histologic types of penile carcinoma at the Lagos University Teaching Hospital ...

  7. Antibiotic resistance among heterotrophic bacteria in Lagos Lagoon ...

    African Journals Online (AJOL)

    Antibiotic-resistant bacteria in the aquatic environment are considered reservoirs for drug-resistant genes. Therefore, culturable heterotrophic bacteria isolated from Lagos Lagoon surface waters between 2011 and 2012 were screened for their susceptibility to 14 commonly used antibiotics belonging to six major classes.

  8. Polychlorinated biphenyl in fish samples from Lagos Lagoon, Nigeria

    African Journals Online (AJOL)

    Several fish samples from the Lagos lagoon, Nigeria were analyzed for the presence of polychlorinated biphenyls (PCBs). The fish species analyzed include Tilapia zilli (red belly Tilapia), Ethmalosa fimbriata (Bonga shad) and Chrysichthys nigrodigitatus (catfish). Eight PCB congeners were identified and quantified in ...

  9. Correlates of Abortion Related Maternal Mortality at the Lagos State ...

    African Journals Online (AJOL)

    This study was carried out to highlight the probable correlates of mortality among patients managed for abortion related complications at the Lagos State University Teaching Hospital, Ikeja. All patients managed for abortion related complications between 1st January 2000 and 31st December 2003 were studied. Certain ...

  10. Fish resources of Lagos State coastal wetlands | Ayodele | African ...

    African Journals Online (AJOL)

    Fishing is the major occupation of the people found along the coastal wetland of Lagos State. Fishing is carried out all the year round. This study examines the fishing Activities, Gear composition and fishing methods in order to obtain the fish species and harvest composition of the study area. This paper is based on the ...

  11. Lagos Journal of Library and Information Science: Editorial Policies

    African Journals Online (AJOL)

    Focus and Scope. Mission Lagos Journal of Library and Information Science aims to be a world class professional and scholarship journal. Vision To serve as a vehicle for the dissemination of research results. To provide a credible platform for scholarly communication. To promote intellectual discourse among library, ...

  12. Physico-chemical properties of municipal refuse in Lagos metropolis ...

    African Journals Online (AJOL)

    This study investigated the activities of micro organisms involved in the degradation of organic matter in solid wastes and their potential to produce cellulolytic enzymes. Soil samples of decomposing waste piles were collected from four designated landfill sites in Lagos metropolis and analyzed for physicochemical ...

  13. Children's Perception of Television Commercial in Lagos State ...

    African Journals Online (AJOL)

    This constitutes one of the major problems confronting television advertising to children. The aim of this study is to determine the effect of children age on their understanding of television commercial in Lagos State, Nigeria. It will also consider the type of commercial watched, what interest the children and promotional theme ...

  14. A Review of Nosocomial Infection at the Lagos university Teaching ...

    African Journals Online (AJOL)

    The infection control program of the Lagos Universityteaching hospital was started in 1974 with an Infection Control team reporting to an Infection Control Committee. There is currently no functioning ... were the most common pathogens accounting for 75% of all organisms isolated. The prevalence of Staphylococcus aureus ...

  15. An institutional survey of female genital mutilation in Lagos, South ...

    African Journals Online (AJOL)

    Background: Female genital mutilation (FGM) as a procedure can have serious physical and psychological health consequences in girls and women. Objectives: To determine the prevalence of FGM and the socio-demographic factors which influence the practice among women in Lagos State. Methods: This was a ...

  16. Cases of ectopic pregnancies as seen in Lagos State University ...

    African Journals Online (AJOL)

    Objective: To determine the prevalence rate, the major forms of ectopic pregnancy and to correct some of the inadequacies in filling of the laboratory forms. Materials and Methods: Relevant data on 91 ectopic pregnancy specimens received at the Lagos State University Teaching Hospital (LASUTH), Ikeja between May 1 ...

  17. Islam and Hausa culture | Adeleke | Lagos Notes and Records

    African Journals Online (AJOL)

    Lagos Notes and Records. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 10 (2004) >. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register. DOWNLOAD FULL TEXT Open Access DOWNLOAD FULL TEXT ...

  18. AMBIENT AIR PARTICULATE MATTER IN LAGOS, NIGERIA: A ...

    African Journals Online (AJOL)

    ... at three locations in Lagos, Nigeria were analyzed by the combination of wavelength-dispersive X-ray fluorescence and atomic absorption spectroscopy methods. Elemental concentrations were subjected to factor analysis for source identification and chemical mass balance model was used for source apportionment.

  19. Prevalence and Trends in Breast Cancer in Lagos State, Nigeria

    African Journals Online (AJOL)

    Nekky Umera

    Abstract. The study examined the trends in the prevalence of breast cancer in Lagos. State, Nigeria. A sample of 1000 subjects was taken from a population consisting of women between the ages of 15 and 60 years spread across the. 20 Local Government Areas (LGAs) of the State. Fifty questionnaires were distributed in ...

  20. Recruitment Pattern Of Macrobrachium vollenhovenii In The Lagos ...

    African Journals Online (AJOL)

    Recruitment pattern of Macrobrachium vollenhovenii in the Lagos – Lekki Lagoon System was estimated from a time series length-frequency data of two years (April 2002 – May 2004). The annual recruitment pattern was estimate through back-projection, along a trajectory defined by the von Bertalanffy Growth Formula ...

  1. Personnel Recruitment and Retention Strategies in Lagos State Civil ...

    African Journals Online (AJOL)

    Nekky Umera

    Keywords: Lagos State Civil Service, Personnel Recruitment, Retention,. Performance .... involving intrinsic and extrinsic factors, the tendency is for employees to want to remain and work for the growth of the .... security amongst employees of the CS have gone a long way to influence their resolve to serve in LSCS for as ...

  2. Malaria and pneumonia occurrence in Lagos, Nigeria: Role of ...

    African Journals Online (AJOL)

    The role of climatic parameters in the prevalence and severity of some common diseases is being speculated in the face of changing climate of the world. We investigate this supposition by expounding the relationship between malaria, pneumonia, rainfall and air temperature over Lagos, Nigeria. This study uses ...

  3. Lagos Journal of Library and Information Science: Submissions

    African Journals Online (AJOL)

    The Lagos Journal of Library and Information Science will consider issues of interest to library users, including reports on user expectations and requirements generated both by libraries ... The journal will also cover technological issues which impact on library and information provision. ... Supply Chain Management, Vol.

  4. Russian culture and perestroika: An appraisal | Chukwube | Lagos ...

    African Journals Online (AJOL)

    Lagos Notes and Records. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 16 (2010) >. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register. DOWNLOAD FULL TEXT Open Access DOWNLOAD FULL TEXT ...

  5. Urban Renewal and Associated Problems in Lagos, 1924 – 1990 ...

    African Journals Online (AJOL)

    ... traffic congestion, increase in traffic noise, air pollution, flooding, and decadent infrastructure among others. Urban/municipal infrastructure which involves specifying, designing, constructing, and maintaining several services has never had it so good in Lagos. The coordination of these infrastructure networks and services, ...

  6. Assessment of household energy utilized for cooking in Ikeja, Lagos ...

    African Journals Online (AJOL)

    Household cooking energy accounts for a major part of the total energy consumed in Nigeria. Factors affecting the choice of Household energy utilized for cooking and the type preferred in Ikeja area of Lagos state were investigated in this study. Data were obtained through oral interview and administration of structured ...

  7. 64 The Impact of Urbanization on Housing Development: The Lagos ...

    African Journals Online (AJOL)

    `123456789jkl''''#

    1851 and the cession of Lagos to the British government in 1861, which ushered in an improved socio-political era, new groups of migrants were attracted to the city. Such groups included freed slaves from Brazil, Sierra-Leone, and from the hinterland. European merchants, missionaries, Egba christian refugees and traders.

  8. Music education and musical activities in Lagos: then and now ...

    African Journals Online (AJOL)

    This article is a historical excursion into the musical activities in Lagos from around 600 to 1800, which it classifies as the first phase, from around 1800 to 1914, the second period, and third period, from around 1914 up to date and how they have affected music education in the area. The study also highlights the roles played ...

  9. Quality of gari (roasted cassava mash) in Lagos State, Nigeria ...

    African Journals Online (AJOL)

    Gari is creamy-white, partially gelatinized roasted free flowing granular flour made from cassava roots. It is a major staple consumed in both urban and rural areas due to its convenience. Quality of Gari (roasted cassava mash) in Lagos, Nigeria was investigated. Gari samples were collected at random from different ...

  10. Gender-Equity and Reproductive Behaviour in Lagos State, Nigeria ...

    African Journals Online (AJOL)

    The study examined the impact of gender differences on couples' reproductive behaviour. The study was conducted in Ikeja, Ojo, Epe respectively representing urban, semi-urban and rural local government areas of Lagos State. Quantitative and qualitative data were collected. A multi-stage sampling procedure was ...

  11. Trend of Heavy Metal Concentrations in Lagos Lagoon Ecosystem

    African Journals Online (AJOL)

    komla

    The distribution and occurrence of heavy metals in the sediment, water and benthic animals of the Lagos lagoon ... sediment, water and animal samples collected from zones 1-3 of the lagoon that received most of the industrial effluents ..... drainage channels and streams continued increasing concentrations of heavy metals.

  12. Assessment of Subsurface Conditions in a Coastal Area of Lagos ...

    African Journals Online (AJOL)

    An integrated geophysical and geotechnical survey was carried out at Magodo Estate, Lagos, Nigeria. The buildings in this area are either sinking or intensively affected by severe cracks showing structural instability. The survey was aimed at characterizing the shallow subsurface in order to delineate features that may have ...

  13. Geophysical study of saline water intrusion in Lagos municipality ...

    African Journals Online (AJOL)

    Saline water intrusion presently constitutes serious concerns in the Lagos municipality just like many other coastal cities, thus necessitating its intervallic study. The present study involving 52 borehole logs (consisting of natural gamma and electrical resistivity components) was aimed at delineating intruded and vulnerable ...

  14. Cytomegalovirus antibodies among healthy blood donors at Lagos ...

    African Journals Online (AJOL)

    Objectives. Cytomegalovirus (CMV) is found worldwide in all geographical locations and socio-economic groups and is the virus most frequently transmitted to a developing child before birth. This study aimed to determine the prevalence and risk factors for CMV antibodies among healthy blood donors at Lagos University ...

  15. Perinatal Mortality Among Twins In Lagos University Teaching ...

    African Journals Online (AJOL)

    Background: Perinatal mortality rate is reported to be higher in twins than in singletons. More than two decades ago, Abudu and Agarin reported a twinning rate of 21.1/1000 maternities and perinatal mortality rate of 142.6/1000 among twins in Lagos. Objective: To determine the current perinatal mortality rate and risk factors ...

  16. John Lyons' Chomsky: A Review Essay | Eleshin | Lagos Notes and ...

    African Journals Online (AJOL)

    Lagos Notes and Records. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 18, No 1 (2012) >. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register. DOWNLOAD FULL TEXT Open Access DOWNLOAD FULL ...

  17. The Cold War and American Aid to Nigeria | Adeniji | Lagos ...

    African Journals Online (AJOL)

    The Cold War and American Aid to Nigeria. Abolade Adeniji. Abstract. No Abstract Available Lagos Historical Review Vol.3 2003: 112-131. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/lhr.v3i1.32508 · AJOL African Journals Online. HOW TO ...

  18. Temporal variation in the ecology of Kuramo water, Lagos Nigeria ...

    African Journals Online (AJOL)

    Temporal variation in the ecology of Kuramo water was studied in the Lagos lagoon complex. Physicochemical parameters and heavy metals concentration were analyzed. Eight sites were marked using the geographical positioning system (GPS model-12). Water chemistry was determined for 8 months and sampling was ...

  19. An audit of hysterectomy at the Lagos University Teaching Hospital ...

    African Journals Online (AJOL)

    Context: Hysterectomy is a common major gynaecological operation in many nations of the world. Significant morbidities and death have been associated with the procedure. Objective: To identify the indications, types and peri-operative events associated with hysterectomy in Lagos. Study design: A retrospective study ...

  20. Knowledge And Attitude Of Youth Corps Members In Lagos To ...

    African Journals Online (AJOL)

    Sickle cell disease has remained a public health problem in Nigeria. This study was carried out to determine the knowledge and attitudes of unmarried NYSC members in Lagos State to sickle cell disease and screening. This study was a cross sectional study. Multistage sampling technique was used to select the ...

  1. The pattern and challenges of infertility management in Lagos, Nigeria

    African Journals Online (AJOL)

    EB

    Abstract. Background: Infertility remains a threat to successful reproduction by couples desirous of pregnancy. Objective: To determine the pattern of infertility cases amongst infertile couples seeking care in Lagos University Teaching. Hospital as well as challenges in their management. Methods: A review of the ...

  2. Information Technology Usage by Advertising Agencies in Lagos ...

    African Journals Online (AJOL)

    The study investigated the usage of information technology (IT) by advertising agencies in Lagos, Nigeria. Thirty-four agencies were randomly sampled from a list of 76 registered advertising agencies. Each of these agencies had at least four basic departments. One professional was randomly selected from each of the ...

  3. Patent Medicine Vendors in Rural Areas of Lagos Nigeria ...

    African Journals Online (AJOL)

    Purpose: To determine the compliance of patent medicine vendors (PMVs) in rural areas of Lagos State, Nigeria with set guidelines to regulate their practice and its implications for malaria control. Methods: A baseline cross-sectional study was conducted as part of an intervention study in two rural local government areas ...

  4. Immediate replacement of lost teeth in a tertiary hospital, Lagos ...

    African Journals Online (AJOL)

    Methods: Records of patients who attended the Restorative Dentistry clinics of Lagos University Teaching Hospital (LUTH) over a period of ten months were retrieved. Demographic data including patient's occupation was collected. Clinical history including tooth/teeth indicated for immediate replacement, treatment obtained ...

  5. Pattern of juvenile periodontitis in Lagos University Teaching ...

    African Journals Online (AJOL)

    Objective: The aim of the survey was to study the pattern of juvenile periodontitis patients that presented at the Lagos University Teaching Hospital Dental Centre from November 1999 to March 2004. Methods: Through review of case files of patients, twenty six juvenile periodontitis patients, within the age range of 18 and 30 ...

  6. Human papillomavirus (HPV infection and vaccines: Knowledge, attitude and perception among female students at the University of Lagos, Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Christian Chigozie Makwe

    2012-12-01

    Conclusion: The knowledge of and the perceived susceptibility to HPV infection and HPV-related diseases among female students in the University of Lagos were generally low. The need for a well-designed HPV-educational program to bridge the knowledge gap cannot be overemphasized.

  7. Lysogenic infection in sub-tropical freshwater cyanobacteria cultures and natural blooms

    NARCIS (Netherlands)

    Steenhauer, L.M.; Pollard, P.C.; Brussaard, C.P.D.; Säwström, C.

    2014-01-01

    Lysogeny has been reported for a few freshwater cyanobacteria cultures, but it is unknown how prevalent it is in freshwater cyanobacteria in situ. Here we tested for lysogeny in (a) cultures of eight Australian species of subtropical freshwater cyanobacteria; (b) seven strains of one species:

  8. Especies del Fitoplancton Presentes en el Lago Tonatiahua, Morelos, México Especies del Fitoplancton Presentes en el Lago Tonatiahua, Morelos, México

    Directory of Open Access Journals (Sweden)

    Roberto Trejo Albarrán

    2012-02-01

    Full Text Available Se llevó a cabo un reconocimiento de las especies del fitoplancton del Lago Tonatiahua, Morelos, México, registrándose un total de 24 especies, incluidas en las siguientes clases: Chlorophyceae con 4 especies, Chlamydophyceae con 3 especies, Cyanophyceae con 3 especies, Euglenophyceae con 2 especies, Dinophyceae con 1 especie y Bacillariophyceae con 11, se da una descripción de cada una de ellas y la distribución que presentaron en la columna de agua durante el estudio. An examination of the phytoplankton species from the Tonatiahua lake of Morelos, Mexico was carried out. 24species were examinated. They were included in the following classification: Chlorophyceae with 4species, Chlamydophyceae with 3species, Cyanophyceae with 3 species, Euglenophyceae with 2 species, Dinophyceae with 1 species, Bacillariophyceae with 11 species, a description of each are and its distribution in a water column during the test are presented in this paper.

  9. CROATIAN FRESHWATER FISHERY

    Directory of Open Access Journals (Sweden)

    Višnja Knjaz

    2007-07-01

    Full Text Available The basic characteristics of freshwater fishery in Croatia are predominantly negative trend in the past twenty years. Even though the total fish pond area covers more than 12,000 hectares, only 6,200 hectares of carp ponds and 58,700 m2 of trout ponds have been exploited. In 2006 the production of total freshwater fish reached 6,547 tons, out of which the production of consumable fish amounted to 5,067 tons and the juveniles 1,480 tons. The export of freshwater fish to EU countries, Macedonia, Bosnia and Herzegovina, Serbia and Monte Negro shows the positive trend and the Republic of Croatia continuously records a foreign trade surplus (987,000 US$. It must be pointed out, though, that the import of trout from Bosnia and Herzegovina significantly increased in the past three years which resulted in the decrease of the foreign trade surplus in that sector. The freshwater fishery in Croatia has been overly burdened by many problems

  10. Correlates of job satisfaction amongst quantity surveyors in consulting firms in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Henry Ndubuisi Onukwube

    2012-05-01

    Full Text Available Normal 0 false false false EN-US X-NONE X-NONE Job satisfaction is the sense of well- being, good feeling and positive mental state that emerge in an incumbent worker when his obtained reward consequent upon his performance is congruent with his equitable reward.The aim of this study is to ascertain the levels of job satisfaction amongst quantity surveyors in consulting firms in Lagos, Nigeria. Biographical and job descriptive index questionnaires (JDI were administered to gather the data. The JDI measures job satisfaction on five facets, namely, pay, promotions, supervision, co-workers and the work itself. A total of 100 questionnaires were collected and used for the study. The survey covered quantity surveyors in consulting firms in Lagos and the respondents were selected using stratified random sampling technique. Data collected were analysed using descriptive statistics, correlation matrix, t-test and one way anova. Findings of the study revealed that the respondents were satisfied with the relationship with co-workers, nature of work and the supervision they receive. Major sources of dissatisfaction are promotion and salaries of the respondents. This finding is a bold step and necessary benchmark for resolving major sources of dissatisfaction among quantity surveyors in consulting firms. The roles of other contextual factors on job satisfaction need to be contemplated for future research.

  11. Correlates of job satisfaction amongst quantity surveyors in consulting firms in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Henry Ndubuisi Onukwube

    2012-05-01

    Full Text Available Job satisfaction is the sense of well- being, good feeling and positive mental state that emerge in an incumbent worker when his obtained reward consequent upon his performance is congruent with his equitable reward.The aim of this study is to ascertain the levels of job satisfaction amongst quantity surveyors in consulting firms in Lagos, Nigeria. Biographical and job descriptive index questionnaires (JDI were administered to gather the data. The JDI measures job satisfaction on five facets, namely, pay, promotions, supervision, co-workers and the work itself. A total of 100 questionnaires were collected and used for the study. The survey covered quantity surveyors in consulting firms in Lagos and the respondents were selected using stratified random sampling technique. Data collected were analysed using descriptive statistics, correlation matrix, t-test and one way anova. Findings of the study revealed that the respondents were satisfied with the relationship with co-workers, nature of work and the supervision they receive. Major sources of dissatisfaction are promotion and salaries of the respondents. This finding is a bold step and necessary benchmark for resolving major sources of dissatisfaction among quantity surveyors in consulting firms. The roles of other contextual factors on job satisfaction need to be contemplated for future research.

  12. Recursos hídricos en los Andes: Lago Titicaca

    Directory of Open Access Journals (Sweden)

    1995-01-01

    Full Text Available RESSOURCES EN EAUX DANS LES ANDES : LAC TITICACA. Une analyse par régression a été menée entre les variations de niveau du Lac Titicaca et les entrées du système (apports des affluents et précipitations. Les coefficients de corrélation, quoique relativement faibles, montrent aux abords du lac un effet de persistance qui diminue lorsque les stations sont éloignées du plan d’eau. L’inertie du lac se manifeste l’année suivante pour les affluents du lac et évidemment pour le lac lui-même. Ces résultats confirment la présence d’un mécanisme de rétro alimentation (effet boomerang. Cela montre que le système du Lac Titicaca est fragile, face à une utilisation excessive de ses eaux. Las regresiones estudiadas de cambios de nivel en el lago Titicaca contra precipitaciones y aportes en su cuenca, aunque relativamente bajas, muestran un efecto de persistencia en las proximidades del lago que decrece conforme las estaciones se alejan de éste. Lo que evidencia que la inercia del lago se manifiesta en el período siguiente (lag uno en los afluentes del lago y obviamente en el propio lago, fenómeno que parece confirmar la presencia de un mecanismo de retroalimentación (efecto boomerang. Este comportamiento muestra la fragilidad del lago frente a un aprovechamiento consuntivo excesivo. WATER RESOURCES IN THE ANDES: LAKE TITICACA. The studied regressions of the level changes in the Lake Titicaca versus the rainfall and the runoff in the basin, even being relatively low, show an effect of persistence in the proximity of the lake which decreases as we go away from it. This makes evident that the lake inertia manifests itself the following period (lag one in the lake tributaries and obviously in the lake itself, phenomenon which seems to confirm the presence of a feedback mechanism (boomerang effect. This behaviour shows the fragility of the lake against the excessive consumptive uses of the waters in its basin.

  13. Road Traffic Injury in Lagos, Nigeria: Assessing Prehospital Care.

    Science.gov (United States)

    Ibrahim, Nasiru A; Ajani, Abdul Wahab O; Mustafa, Ibrahim A; Balogun, Rufai A; Oludara, Mobolaji A; Idowu, Olufemi E; Solagberu, Babatunde A

    2017-08-01

    Introduction Injuries are the third most important cause of overall deaths globally with one-quarter resulting from road traffic crashes. Majority of these deaths occur before arrival in the hospital and can be reduced with prompt and efficient prehospital care. The aim of this study was to highlight the burden of road traffic injury (RTI) in Lagos, Nigeria and assess the effectiveness of prehospital care, especially the role of Lagos State Ambulance Service (LASAMBUS) in providing initial care and transportation of the injured to the hospital. A three-year, retrospective review of road traffic injured patients seen at the Surgical Emergency Room (SER) of the Lagos State University Teaching Hospital (LASUTH), Ikeja, Nigeria, from January 1, 2012 to December 31, 2014 was conducted. Parameters extracted from the Institution Trauma Registry included bio-data, date and time of injury, date and time of arrival in SER, host status, type of vehicle involved, and region(s) injured. Information on how patients came to the hospital and outcome in SER also were recorded. Results were analyzed using Statistical Package for Social Sciences (SPSS; IBM Corporation; Armonk, New York USA) version 16. A total of 23,537 patients were seen during the study period. Among them, 16,024 (68.1%) had trauma. Road traffic crashes were responsible in 5,629 (35.0%) of trauma cases. Passengers constituted 42.0% of the injured, followed by pedestrians (34.0%). Four wheelers were the most frequent vehicle type involved (54.0%), followed by motor cycles (30.0%). Regions mainly affected were head and neck (40.0%) and lower limb (29.0%). Less than one-quarter (24.0%) presented to the emergency room within an hour, while one-third arrived between one and six hours following injury. Relatives brought 55.4%, followed by bystanders (21.4%). Only 2.3% had formal prehospital care and were brought to the hospital by LASAMBUS. They also had significantly shorter arrival time. One hundred and nine patients

  14. Hematological profile of normal pregnant women in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Akinbami AA

    2013-05-01

    Full Text Available Akinsegun A Akinbami,1 Sarah O Ajibola,2 Kabiru A Rabiu,3 Adeniyi A Adewunmi,3 Adedoyin O Dosunmu,1 Adewumi Adediran,4 Vincent O Osunkalu,4 Bodunrin I Osikomaiya,5 Kamal A Ismail,51Department of Haematology and Blood Transfusion, Lagos State University, College of Medicine, 2Department of Haematology and Blood, Lagos University Teaching Hospital, 3Department of Obstetrics and Gynaecology, Lagos State University, College of Medicine, 4Department of Haematology and Blood, Faculty of Clinical Sciences, College of Medicine, University of Lagos, 5Department of Haematology and Blood Transfusion, Lagos State University Teaching Hospital, Lagos, NigeriaBackground: Hematological profile is considered one of the factors affecting pregnancy and its outcome. Anemia is the most common hematological problem in pregnancy, followed by thrombocytopenia. Leukocytosis is almost always associated with pregnancy. The study reported here was designed to evaluate the overall mean values of seven major hematological parameters and their mean values at different trimesters of pregnancy.Subjects and methods: This examination was a cross-sectional study of 274 pregnant women who registered to attend the Lagos University Teaching Hospital or Lagos State University Teaching Hospital antenatal clinics between their first and third trimester. Blood (4.5 mL was collected from each participant into a tube containing the anticoagulant ethylenediaminetetraacetic acid (EDTA. A full blood count was performed on each sample and the results were analyzed.Results: Overall, the values obtained were (mean ± standard deviation [SD]: hematocrit level, 30.16% ± 5.55%; hemoglobin concentration, 10.94 ± 1.86 g/dL; white blood cells, 7.81 ± 2.34 × 109; platelets, 228.29 ± 65.6 × 109; cell volume 78.30 ± 5.70 fL, corpuscular hemoglobin, 28.57 ± 2.48 pg; and corpuscular hemoglobin concentration, 36.45 ± 1.10 g/dL. When grouped by trimester, the mean ± SD value of packed cell volume

  15. Ethiopian-Sudanese Relations, 1974-1984 | Odesola | Lagos ...

    African Journals Online (AJOL)

    No Abstract Available Lagos Historical Review Vol.3 2003: 94-111. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/lhr.v3i1.32507 · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors · FAQ's · More ...

  16. Atmospheric turbidity and the diffuse irradiance in Lagos, Nigeria

    International Nuclear Information System (INIS)

    Maduekwe, A.A.L.; Chendo, M.A.C.

    1994-06-01

    The relationships between the total hemispherical irradiance reaching the earth surface in Lagos, Nigeria and the turbidity coefficients at two wavelengths namely λ(500) and λ(880) measured with a Volz sun photometer have been investigated. Using simple piecewise linear regression relationships between the atmospheric turbidity using Angstrom turbidity coefficients and the diffuse components of solar radiation are presented. (author). 18 refs, 11 figs, 3 tabs

  17. Nigerian medical libraries in a digital age | Ibegwam | Lagos Journal ...

    African Journals Online (AJOL)

    No Abstract. Lagos Journal of Library and Information Science Vol. 1(2) 2003: 129-135. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/ljlis.v1i2.35488 · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians ...

  18. Sedimentation History of Lago Guayabal, Puerto Rico, 1913-2001

    Science.gov (United States)

    Soler-López, Luis R.

    2003-01-01

    The Lago Guayabal dam, located in the municipality of Villalba in southern Puerto Rico, was constructed in 1913 for irrigation of croplands in the southern coastal plains and is owned and operated by the Puerto Rico Electric Power Authority. The reservoir had an original storage capacity of 11.82 million cubic meters and a drainage area upstream of the dam of 112 square kilometers. Sedimentation has reduced the storage capacity to 6.12 million cubic meters in 2001, which represents a storage loss of about 48 percent. However, the actual sediment accumulation in the reservoir during the 88 years is greater, because some sediment removal was conducted between 1940 and 1948 by dredging and sluicing. This report summarizes the historical data from a 1913 land survey and eight bathymetric surveys conducted between 1914 and 2001, and the relation of high sedimentation to agricultural land practices within the Lago Guayabal basin and six major hurricanes which made landfall on the island. The reservoir had an area-normalized sedimentation rate of about 1,863 cubic meters per square kilometer per year between 1913 and 1936 from a 112 square kilometer basin. In 1972, a new dam upstream along the Rio Toa Vaca impounded runoff from 57.5 square kilometers, and sediment transport to Lago Guayabal was reduced. A comparison of bathymetric survey results between 1972 and 2001 indicates an area-normalized sedimentation rate of 1,120 cubic meters per square kilometer per year or about 60 percent of the rate between 1913 and 1936. The significant reduction (almost half) of the sedimentation rate after the Toa Vaca dam was built may indicate that erosion susceptibility of the Rio Toa Vaca watershed is about twice that of the Rio Jacaguas watershed impounded by Lago Guayabal.

  19. A thematic introduction of knowledge management | Dina | Lagos ...

    African Journals Online (AJOL)

    No Abstract. Lagos Journal of Library and Information Science Vol. 1(2) 2003: 172-178. Full Text: EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/ljlis.v1i2.35494 · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians ...

  20. Responsabilidad Social Empresarial. Caso Centro Comercial Lago Mall

    Directory of Open Access Journals (Sweden)

    Carlos E. Torres Geisse

    2011-01-01

    Full Text Available El objetivo del artículo es el análisis de la responsabilidad empresarial para el centro comercial Lago Mall. El tipo de investigación fue un proyecto factible, descriptivo y de campo, con un diseño de tipo no experimental y transeccional. Se consideró como población al gerente de mercadeo del C.C Lago Mall, a quince (15 miembros de la comunidad interna, y a noventa (90 miembros de la comunidad externa del mismo. Las técnicas de recolección de datos aplicadas fueron: la encuesta y la entrevista. Los instrumentos fueron validados por cinco (5 expertos en gerencia social, obteniendo una confiabilidad de 0,99. Los resultados indican que en ambas dimensiones de la RSE los elementos que la integran no constituían un marco ideal para considerar a la empresa C.C. Lago Mall como socialmente responsable. Se concluye que el mismo carece de programas formales de responsabilidad social empresarial; sin embargo demuestra un compromiso con los principios de la empresa y con los valores de los empleados, donde se destacan la dignidad, identidad e integridad por los grupos de interés que se han denominado internos y externos.

  1. The impact of the Lagos manual vacuum aspiration (MVA) training courses on medical education.

    Science.gov (United States)

    Ogedengbe, O K; Giwa-Osagie, O F; Usifoh, C A; Solanke, O

    1998-01-01

    The Department of Obstetrics and Gynaecology, College of Medicine, University of Lagos commenced training programmes in the use of manual Vacuum Aspiration (MVA) for the treatment of septic abortion in 1989. The courses were evaluated using pre-tests and post-tests, and those of the participants from the first 5 years were analysed. 142 doctors and 72 nurses were trained from teaching hospitals, parastatal and private hospitals. The results of 154 participants (71%) were recovered and analysed. The training courses significantly increased the medical knowledge of both doctors and nurses; those from the Teaching Hospitals appearing to gain more. The amount of knowledge gained by those from the private sector, although showing a statistically significant increase was much less than the other participants. More emphasis should be placed on improving the performance of those from the private sector.

  2. Vestibular disorders among adults in a tertiary hospital in Lagos, Nigeria.

    Science.gov (United States)

    Somefun, O A; Giwa, O S; Bamgboye, B A; Okeke-Igbokwe, I Irene; Azeez, A A Abdul

    2010-10-01

    Dizziness is not an uncommon complaint in the Otolaryngological clinics among other symptoms. To a large number of practitioners, the treatment of dizziness remains the same irrespective of the etiology, i.e., anti-vertiginous drugs. The objective of this study was to document the evaluation, causes and treatment of vestibular disorders among our patients. The design includes descriptive prospective study conducted in the Oto-rhino-laryngology and Orthopedic Clinics of Lagos University Teaching Hospital, Lagos and Nigerian Army Audiological Centre, 68 Nigerian Army Reference Hospital, Yaba, Lagos, Nigeria. Adult patients referred to the audiology clinic for dizziness had detailed history obtained by using structured questionnaire. General physical and neuro-otological examinations were done. Clinical diagnoses were made on standardized criteria. The patients had hearing evaluation, videonystagmography (VNG) evaluation using infrared videonystagmography system. X-ray of the cervical spine and computerized tomogram scan of internal auditory meatus and brain when indicated were done. A total of 102 patients were seen with age range between 21 and 90 years. Thirty patients (29.4%) recorded average duration of episode of vertiginous attacks in seconds, 69 (67.6%) recorded within minutes to hours and 3 (2.9%) with no definite pattern. Clinical signs on neuro-otological examination were elicited on 39 (38.2%) of the patients while on VNG the vestibular subtest mainly caloric test was abnormal unilaterally and bilaterally in 47 (46.1%) while with the oculomotor subtests, smooth pursuit tests were abnormal in 5 (6.9%), saccade tests were abnormal in 8 (7.8%) and OPK were abnormal in 9 (8.8%). Peripheral vestibular disorders are common of which benign paroxysmal positional vertigo (BPPV) was seen in 29 (28.4%), Meniere's disease in 22 (21.6%), recurrent vestibulopathy in 20 (19.6%), cervical vertigo in 18 (17.6%), psychogenic vertigo in 2 (2%), vestibular schwannoma

  3. Toxoplasma gondii infection: seroprevalence and associated risk factors among primary schoolchildren in Lagos City, Southern Nigeria

    Directory of Open Access Journals (Sweden)

    Vincent Pam Gyang

    2015-02-01

    Full Text Available INTRODUCTION: Toxoplasma gondii infection has been described as the most widespread zoonotic infection of humans and other animals. Information concerning T. gondii infection among schoolchildren is unavailable in Lagos City, Nigeria. METHODS: This cross-sectional study investigated the seroprevalence and risk factors associated with T. gondii infection among primary schoolchildren (PSC from a community located in the center of Lagos, southern Nigeria, from November 2013 to March 2014. A total of 382 PSC were screened for the presence of sera anti-T. gondii antibodies using a latex agglutination test (TOXO Test-MT, Tokyo, Japan. A cutoff titer of ≥ 1:32 was considered positive, while titers ≥ 1:1,024 indicated high responders. Questionnaires were also used to obtain data on possible risk factors from parents/guardians. RESULTS: The overall seroprevalence was 24% (91/382, and 83.5% (76/91 of seropositive PSC were classified as high responders. Among the risk factors tested, including contact with cats and soil, consumption of raw meat and vegetables, and drinking unboiled water, none showed statistical significance after multivariate adjustment. No associations were observed among age, gender, body mass index (BMI, and parents' occupation/educational level. CONCLUSIONS: The findings in this study show evidence of active infection, and hence, there is need for urgent preventive measures in this city. Further investigation is required to clarify the transmission routes. Policy makers also need to initiate prevention and control programs to protect pregnant women and immunocompromised patients in particular because they are more severely affected by T. gondii infection.

  4. Analysis of Management Practices in Lagos State Tertiary Institutions through Total Quality Management Structural Framework

    Science.gov (United States)

    AbdulAzeez, Abbas Tunde

    2016-01-01

    This research investigated total quality management practices and quality teacher education in public tertiary institutions in Lagos State. The study was therefore designed to analyse management practices in Lagos state tertiary institutions through total quality management structural framework. The selected public tertiary institutions in Lagos…

  5. Intrigues and Twist in the Imamate Crisis of Lagos Central Mosque ...

    African Journals Online (AJOL)

    The period between 1847 to 1947 was a chequered one in the history of Islam and especially the Imamate in Lagos. After establishing the Imamate, the Lagos Muslim community found the traditional authority as a pillar of support and much later the colonial authority. The crisis, that bedevilled the community from one time ...

  6. The Succession Dispute to the Throne of Lagos and the British ...

    African Journals Online (AJOL)

    info

    Abstract. This paper examined the role and intervention of the British in the internal family dispute relating to the succession to the throne of Lagos that began in the early nineteenth century. That the usuper to the throne of Lagos, Kosoko who was branded a notorious slave trader was abdicated from the throne on the ...

  7. Ambulance Services of Lagos State, Nigeria: A Six-Year (2001 ...

    African Journals Online (AJOL)

    Ambulance Services of Lagos State, Nigeria: A Six-Year (2001–2006) Audit. ... The developed world has recognized the importance of organized emergency medical services and has well established systems. The Lagos State Government ... Analysis of the data was done using the Microsoft Excel software. RESULTS: A ...

  8. The growth and development of Islam in Epe, Lagos State, Nigeria ...

    African Journals Online (AJOL)

    The historiography of Islam in Epe, one of the coastal towns to the east of Lagos, deserves a much closer look, not only because Epe is one of the most Islamised towns on that axis, but also because the circumstances of the spread of Islam into the town was inextricably linked with events in the Lagos Kingdom, especially ...

  9. multivariate analysis of groundwater quality in parts of lagos-nigeria

    African Journals Online (AJOL)

    AKOTEYON

    The quality of twenty-six groundwater sources in Lagos state was evaluated. Data on physico-chemical parameters. (Hydrogen ion, Electrical Conductivity, Total Dissolve Solids, Calcium, Chloride, Total Hardness, Magnesium, Sodium,. Potassium, Bicarbonate and Sulfate) were collated from the database of Lagos Water ...

  10. Migration and Social Change in the Eastern District of Lagos: The ...

    African Journals Online (AJOL)

    The lagoon serves as a catalyst for economic development in the transformation of Lagos, most especially the eastern district. Fishing is central to the economy of Epe and the entire eastern section of Lagos. However, the fishing industry benefitted immensely from the migrating pattern and economic practices of the Mahin ...

  11. Assessment of Subsurface Conditions in a Coastal Area of Lagos using Geophysical Methods

    Directory of Open Access Journals (Sweden)

    K. F. Oyedele

    2015-12-01

    Full Text Available An integrated geophysical and geotechnical survey was carried out at Magodo Estate, Lagos, Nigeria. The buildings in this area are either sinking or intensively affected by severe cracks showing structural instability. The survey was aimed at characterizing the shallow subsurface in order to delineate features that may have caused structural instability that led to cracking and sinking of the residential buildings in the area. To image the subsurface, resistivity profiling (2-D using a Wenner array and Cone Penetration Test (CPT was carried out on five profiles of length 180 m each. The acquired data were processed and interpreted integrally to image the shallow geotechnical setting of the site. Integrated interpretation led to the delineation of low resistivity, low bearing capacity clay which is identified as the main cause of instability that resulted in potentially dangerous cracking and sinking of residential buildings in the area.

  12. Toxicology of freshwater cyanobacteria.

    Science.gov (United States)

    Liyanage, H M; Arachchi, D N Magana; Abeysekara, T; Guneratne, L

    2016-07-02

    Many chemical contaminants in drinking water have been shown to cause adverse health effects in humans after prolonged exposure. Cyanobacteria are one of the most potent and diverse groups of photosynthetic prokaryotes. One key component of cyanobacterial success in the environment is the production of potent toxins as secondary metabolites, which have been responsible for numerous adverse health impacts in humans. Anthropogenic activities have led to the increase of eutrophication in freshwater bodies' worldwide, causing cyanobacterial blooms to become more frequent. The present article will discuss about harmful cyanobacteria and their toxicology with special references to microcystin, nodularin, and cylindrospermopsin.

  13. Himalomycin A and cycloheximide-producing marine actinomycete from Lagos Lagoon soil sediment

    Directory of Open Access Journals (Sweden)

    Davies Olabisi Flora

    2015-05-01

    Full Text Available Objective: To isolate and screen Actinomycetes from Lagos Lagoon soil sediments for antibiotic production. Methods: Soil samples were collected from four different locations of Lagos Lagoon and were dried for 2 weeks. Actinomycetes were isolated by serial dilution using spread plate method on starch casein and Kuster’s agar supplemented with 80 μg/mL cycloheximide to prevent fungal growth. The plates were incubated at 28 °C for 1-2 weeks. Isolates were selected based on their cultural characteristics as well as their Gram’s reaction and subcultured on same media for isolation and incubated at 28 °C for 3 days. Pure cultures were maintained on nutrient agar slants at 4 °C. Thereafter, they were inoculated into starch casein and Kuster’s broth media and incubated at 28 °C for 8 days. The resulting crude extracts were screened for antimicrobial activity against the following microorganisms: methicillin resistant Staphylococcus aureus, Staphylococcus aureus ATCC 29213, Escherichia coli ATCC 29522, Pseudomonas aeruginosa ATCC 27853, Candida albicans and Enterococcus faecalis ATCC 29212. Coagulasenegative staphylococci isolated from HIV patients were also used (Staphylococcus warneri, Staphylococcus xylosus and Staphylococcus epidermidis. Extraction of secondary metabolites was carried out and analysed using gas chromatography-mass spectrometer. Results: All the isolates displayed varying antimicrobial activity against at least one of the test organisms. Himalomycin A was identified in the extract from isolate ULS7. The gas chromatography-mass spectrometer data analysis showed the antibiotic profile of these isolates. Conclusions: The isolate ULS7 was found to display the highest antimicrobial activity against the test organisms.

  14. The freshwater biodegradation potential of nine Alaskan oils

    International Nuclear Information System (INIS)

    Blenkinsopp, S.; Segy, G.

    1997-01-01

    Nine Alaskan representative crude oils and oil products with freshwater spill potential were collected, aged, and incubated in the presence of the standard freshwater inoculum for 28 days at 10 degrees C. Detailed analytical chemistry was performed on all samples to quantify compositional changes. All of the samples tested exhibited measurable hydrocarbon loss as a result of incubation with the freshwater inoculum. Total saturate and total n-alkane biodegradation were greatly enhanced when nutrients were present. The oil products Jet B Fuel and Diesel No. 2 appear to be more biodegradable than the Alaska North Slope and Cook Inlet crude oils tested, while the Bunker C/Diesel mixture appears to be less biodegradable than these crude oils. These results suggest that the screening procedures described here can provide useful information when applying bioremediation technology to the cleanup of selected oiled freshwater environments. 10 refs., 5 tabs., 13 figs

  15. Potential drug–drug interactions in HIV-infected children on antiretroviral therapy in Lagos, Nigeria

    OpenAIRE

    Oshikoya, Kazeem Adeola; Lawal,Saheed; Awodele,Olufunsho; Ogunleye,Olayinka O.; Senbanjo,Idowu O.; Olufemi,Olayemi; Ezeaka,Veronica C.; Temiye,Edamisan O.; Titilope,Adeyemo; Opanuga,Oluranti; Lesi,Olufunmilayo A.; Akanmu,Sulaimon; Oreagba,Ibrahim A.

    2014-01-01

    Kazeem A Oshikoya,1 Ibrahim A Oreagba,2 Saheed Lawal,2 Olufunsho Awodele,2 Olayinka O Ogunleye,1 Idowu O Senbanjo,3 Sunday O Olayemi,2 Veronica C Ezeaka,4,5 Edamisan O Temiye,4,5 Titilope A Adeyemo,4,6 Oluranti Opanuga,4,7 Olufunmilayo A Lesi,4,8 Sulaimon A Akanmu4,6 1Department of Pharmacology, Lagos State University College of Medicine, Ikeja, Lagos, Nigeria; 2Department of Pharmacology, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria; 3Department of Paediatrics, Lagos S...

  16. The Zoogeography of North American freshwater fishes

    National Research Council Canada - National Science Library

    Hocutt, Charles H; Wiley, E. O

    1986-01-01

    ..., and Pleistoscene glaciation. The Zoogeography of North American Freshwater Fishes is a comprehensive treatment of the freshwater biogeography of North America, with implications for other disciplines...

  17. Sedimentation Survey of Lago de Cidra, Puerto Rico, August 2007

    Science.gov (United States)

    Soler-López, Luis R.

    2010-01-01

    Lago de Cidra is a reservoir located on the confluence of Rio de Bayamon, Rio Sabana, and Quebrada Prieta, in the municipality of Cidra in east-central Puerto Rico, about 3.0 kilometers northeast of the town of Cidra. The dam is owned and operated by the Puerto Rico Aqueduct and Sewer Authority (PRASA), and was constructed in 1946 as a 6.54-million-cubic-meter supplemental water supply for the San Juan metropolitan area. The reservoir impounds the waters of Rio de Bayamon, Rio Sabana and Quebrada Prieta. The reservoir has a drainage area of 21.4 square kilometers. The dam is a concrete gravity and earthfill structure with a length of approximately 165 meters and a structural height of 24 meters. The spillway portion of the dam is an ungated ogee crest about 40 meters long with a crest elevation of 403.00 meters above mean sea level. Additional information and operational procedures are listed in Soler-Lopez (1999). During August 14-15, 2007, the U.S. Geological Survey (USGS), Caribbean Water Science Center (CWSC), in cooperation with the PRASA, conducted a bathymetric survey of Lago de Cidra to update the reservoir storage capacity and actualize the reservoir sedimentation rate by comparing the 2007 data with the previous 1997 bathymetric survey data. The purpose of this report is to describe and document the USGS sedimentation survey conducted at Lago de Cidra during August 2007, including the methods used to update the reservoir storage capacity, sedimentation rates, and areas of substantial sediment accumulation since 1997.

  18. Sedimentation Survey of Lago La Plata, Puerto Rico, July 2006

    Science.gov (United States)

    Soler-López, Luis R.

    2008-01-01

    Lago La Plata dam is located between the municipalities of Naranjito and Toa Alta in north central Puerto Rico, about 5 kilometers south of the town of Toa Alta and about 5 kilometers north of the town of Naranjito. The reservoir impounds the waters of the Rio de La Plata, the Rio Guadiana, and the Rio Ca?as, and is part of the San Juan Metropolitan Water District, which provides about 35 percent of the total water demand for the area (Soler-Lopez and others, 2000). The reservoir has a drainage area of about 469 square kilometers. The dam was constructed in 1974 and is a concrete gravity structure with a normal pool elevation of 52.00 meters above mean sea level (Puerto Rico Electric Power Authority, 1979). During October 1998, the U.S. Geological Survey (USGS), Caribbean Water Science Center, in cooperation with the Puerto Rico Aqueduct and Sewer Authority (PRASA) conducted a bathymetric survey of Lago La Plata to assess the impact of Hurricane Georges on the storage capacity of the reservoir. Between July 17 and 20, 2006, the USGS and the PRASA conducted an additional bathymetric survey of Lago La Plata to update the reservoir storage capacity and determine the reservoir sedimentation rate by comparing the 2006 survey data with the 1998 survey data.. The purpose of this report is to update the reservoir storage capacity, sedimentation rates, and areas of substantial sediment accumulation since 1998. Historical (1974) data are referenced as needed to account for long-term storage capacity loss trends...

  19. Dog ecology and population studies in Lagos State, Nigeria.

    Science.gov (United States)

    Hambolu, Sunday Emmanuel; Dzikwi, Asabe A; Kwaga, Jacob K P; Kazeem, Haruna M; Umoh, Jarlath U; Hambolu, Dupe A

    2014-02-14

    Dog population dynamics have a major impact upon the effectiveness of rabies control strategies. As such, understanding domestic dog ecology has been recognized as central to the design of effective rabies control programmes. This study was conducted to determine the dog ecology in Lagos State using compound dog count and street dog count in the three senatorial districts (Lagos West, East and Central) of Lagos State from February, 2011 to January, 2012. A total of 546 questionnaires were distributed for the compound dog count and all were completed and returned. Various aspects of dog ecology were determined, including size, sex, breed of the dog population, management of dogs and rabies awareness among the respondents. Out of the 546 compounds surveyed, 518 (94.87%) owned at least one dog. A total of 1,427 dogs were counted from the street counts while a total of 1,447 dogs (2.8 dogs/compound) were counted from the compound count. The dogs comprised of 583 males and 864 females, out of which 64.10% are confined. The dog vaccination coverage in the dog population surveyed was 64.10% and administered majorly (91.30%) by veterinarians. Security (60%) and pets (26%) were the major reasons for keeping dogs. Majority (88.80%) of the respondents were aware of rabies and its mode of transmission, but still believed in the use of concoctions (40.40%), herbs (19.90%) and consumption of the organ of the offending dog (11.50%) for the treatment of rabies. The findings of this study showed a male: female ratio of dog to be 1:1.5 and a dog: human ratio of 1:5.6. There was also a responsible dog ownership as majority of the respondents do confine, vaccinate and provide food for their dogs. Vaccination coverage of the total dog population was however below the 70-80% target recommended by the World Health Organization to achieve herd immunity.

  20. Sedimentation survey of Lago Caonillas, Puerto Rico, February 2000

    Science.gov (United States)

    Soler-López, Luis R.

    2001-01-01

    Lago Caonillas, a reservoir owned by the Puerto Rico Electric Power Authority and located in the central part of Puerto Rico, is one of the two reservoirs (the other being Lago Dos Bocas) proposed to supply water for the Puerto Rico Aqueduct and Sewer Authority project called the Superaqueduct. The reservoir was impounded in 1948 and originally provided about 55 .66 million cubic meters of water for hydroelectric power generation. Sediment derived from the reservoir basin has been transported and deposited in the reservoir bottom, substantially decreasing the water storage capacity over time. Successive bathymetric surveys indicated that in 1990 the storage capacity was 49.25 million cubic meters, decreasing to 48.80 million cubic meters in 1995 and to 42.27 million cubic meters in 2000. This represents an overall storage loss of about 11.5 percent by 1990, 12.3 percent by 1995 and 24.1 percent by 2000. The long-term sedimentation rate of the reservoir was about 153,000 cubic meters per year in 1990, remaining almost constant at about 146,000 cubic meters per year in 1995, but nearly doubling to 258,000 cubic meters per year in 2000. The two-fold increase in sedimentation rate, and consequently, the reservoir storage capacity loss, can be attributed to Hurricane Hortense in September 1996 and Hurricane Georges in September 1998. Twenty-four percent of the original storage capacity of Lago Caonillas has been lost to sediment accumulation. About 49 percent of the reservoir sediment was deposited in the last five years, demonstrating the impact of these major storms on the reservoir.

  1. LAGOS-NE: a multi-scaled geospatial and temporal database of lake ecological context and water quality for thousands of US lakes

    Science.gov (United States)

    Soranno, Patricia A.; Bacon, Linda C.; Beauchene, Michael; Bednar, Karen E.; Bissell, Edward G.; Boudreau, Claire K.; Boyer, Marvin G.; Bremigan, Mary T.; Carpenter, Stephen R.; Carr, Jamie W.; Cheruvelil, Kendra S.; Christel, Samuel T.; Claucherty, Matt; Collins, Sarah M.; Conroy, Joseph D.; Downing, John A.; Dukett, Jed; Fergus, C. Emi; Filstrup, Christopher T.; Funk, Clara; Gonzalez, Maria J.; Green, Linda T.; Gries, Corinna; Halfman, John D.; Hamilton, Stephen K.; Hanson, Paul C.; Henry, Emily N.; Herron, Elizabeth M.; Hockings, Celeste; Jackson, James R.; Jacobson-Hedin, Kari; Janus, Lorraine L.; Jones, William W.; Jones, John R.; Keson, Caroline M.; King, Katelyn B.S.; Kishbaugh, Scott A.; Lapierre, Jean-Francois; Lathrop, Barbara; Latimore, Jo A.; Lee, Yuehlin; Lottig, Noah R.; Lynch, Jason A.; Matthews, Leslie J.; McDowell, William H.; Moore, Karen E.B.; Neff, Brian; Nelson, Sarah J.; Oliver, Samantha K.; Pace, Michael L.; Pierson, Donald C.; Poisson, Autumn C.; Pollard, Amina I.; Post, David M.; Reyes, Paul O.; Rosenberry, Donald; Roy, Karen M.; Rudstam, Lars G.; Sarnelle, Orlando; Schuldt, Nancy J.; Scott, Caren E.; Skaff, Nicholas K.; Smith, Nicole J.; Spinelli, Nick R.; Stachelek, Joseph J.; Stanley, Emily H.; Stoddard, John L.; Stopyak, Scott B.; Stow, Craig A.; Tallant, Jason M.; Tan, Pang-Ning; Thorpe, Anthony P.; Vanni, Michael J.; Wagner, Tyler; Watkins, Gretchen; Weathers, Kathleen C.; Webster, Katherine E.; White, Jeffrey D.; Wilmes, Marcy K.; Yuan, Shuai

    2017-01-01

    Understanding the factors that affect water quality and the ecological services provided by freshwater ecosystems is an urgent global environmental issue. Predicting how water quality will respond to global changes not only requires water quality data, but also information about the ecological context of individual water bodies across broad spatial extents. Because lake water quality is usually sampled in limited geographic regions, often for limited time periods, assessing the environmental controls of water quality requires compilation of many data sets across broad regions and across time into an integrated database. LAGOS-NE accomplishes this goal for lakes in the northeastern-most 17 US states.LAGOS-NE contains data for 51 101 lakes and reservoirs larger than 4 ha in 17 lake-rich US states. The database includes 3 data modules for: lake location and physical characteristics for all lakes; ecological context (i.e., the land use, geologic, climatic, and hydrologic setting of lakes) for all lakes; and in situ measurements of lake water quality for a subset of the lakes from the past 3 decades for approximately 2600–12 000 lakes depending on the variable. The database contains approximately 150 000 measures of total phosphorus, 200 000 measures of chlorophyll, and 900 000 measures of Secchi depth. The water quality data were compiled from 87 lake water quality data sets from federal, state, tribal, and non-profit agencies, university researchers, and citizen scientists. This database is one of the largest and most comprehensive databases of its type because it includes both in situ measurements and ecological context data. Because ecological context can be used to study a variety of other questions about lakes, streams, and wetlands, this database can also be used as the foundation for other studies of freshwaters at broad spatial and ecological scales.

  2. LAGOS-NE: a multi-scaled geospatial and temporal database of lake ecological context and water quality for thousands of US lakes

    Science.gov (United States)

    Bacon, Linda C; Beauchene, Michael; Bednar, Karen E; Bissell, Edward G; Boudreau, Claire K; Boyer, Marvin G; Bremigan, Mary T; Carpenter, Stephen R; Carr, Jamie W; Christel, Samuel T; Claucherty, Matt; Conroy, Joseph D; Downing, John A; Dukett, Jed; Filstrup, Christopher T; Funk, Clara; Gonzalez, Maria J; Green, Linda T; Gries, Corinna; Halfman, John D; Hamilton, Stephen K; Hanson, Paul C; Henry, Emily N; Herron, Elizabeth M; Hockings, Celeste; Jackson, James R; Jacobson-Hedin, Kari; Janus, Lorraine L; Jones, William W; Jones, John R; Keson, Caroline M; King, Katelyn B S; Kishbaugh, Scott A; Lathrop, Barbara; Latimore, Jo A; Lee, Yuehlin; Lottig, Noah R; Lynch, Jason A; Matthews, Leslie J; McDowell, William H; Moore, Karen E B; Neff, Brian P; Nelson, Sarah J; Oliver, Samantha K; Pace, Michael L; Pierson, Donald C; Poisson, Autumn C; Pollard, Amina I; Post, David M; Reyes, Paul O; Rosenberry, Donald O; Roy, Karen M; Rudstam, Lars G; Sarnelle, Orlando; Schuldt, Nancy J; Scott, Caren E; Smith, Nicole J; Spinelli, Nick R; Stachelek, Joseph J; Stanley, Emily H; Stoddard, John L; Stopyak, Scott B; Stow, Craig A; Tallant, Jason M; Thorpe, Anthony P; Vanni, Michael J; Wagner, Tyler; Watkins, Gretchen; Weathers, Kathleen C; Webster, Katherine E; White, Jeffrey D; Wilmes, Marcy K; Yuan, Shuai

    2017-01-01

    Abstract Understanding the factors that affect water quality and the ecological services provided by freshwater ecosystems is an urgent global environmental issue. Predicting how water quality will respond to global changes not only requires water quality data, but also information about the ecological context of individual water bodies across broad spatial extents. Because lake water quality is usually sampled in limited geographic regions, often for limited time periods, assessing the environmental controls of water quality requires compilation of many data sets across broad regions and across time into an integrated database. LAGOS-NE accomplishes this goal for lakes in the northeastern-most 17 US states. LAGOS-NE contains data for 51 101 lakes and reservoirs larger than 4 ha in 17 lake-rich US states. The database includes 3 data modules for: lake location and physical characteristics for all lakes; ecological context (i.e., the land use, geologic, climatic, and hydrologic setting of lakes) for all lakes; and in situ measurements of lake water quality for a subset of the lakes from the past 3 decades for approximately 2600–12 000 lakes depending on the variable. The database contains approximately 150 000 measures of total phosphorus, 200 000 measures of chlorophyll, and 900 000 measures of Secchi depth. The water quality data were compiled from 87 lake water quality data sets from federal, state, tribal, and non-profit agencies, university researchers, and citizen scientists. This database is one of the largest and most comprehensive databases of its type because it includes both in situ measurements and ecological context data. Because ecological context can be used to study a variety of other questions about lakes, streams, and wetlands, this database can also be used as the foundation for other studies of freshwaters at broad spatial and ecological scales. PMID:29053868

  3. LAGOS-NE: a multi-scaled geospatial and temporal database of lake ecological context and water quality for thousands of US lakes.

    Science.gov (United States)

    Soranno, Patricia A; Bacon, Linda C; Beauchene, Michael; Bednar, Karen E; Bissell, Edward G; Boudreau, Claire K; Boyer, Marvin G; Bremigan, Mary T; Carpenter, Stephen R; Carr, Jamie W; Cheruvelil, Kendra S; Christel, Samuel T; Claucherty, Matt; Collins, Sarah M; Conroy, Joseph D; Downing, John A; Dukett, Jed; Fergus, C Emi; Filstrup, Christopher T; Funk, Clara; Gonzalez, Maria J; Green, Linda T; Gries, Corinna; Halfman, John D; Hamilton, Stephen K; Hanson, Paul C; Henry, Emily N; Herron, Elizabeth M; Hockings, Celeste; Jackson, James R; Jacobson-Hedin, Kari; Janus, Lorraine L; Jones, William W; Jones, John R; Keson, Caroline M; King, Katelyn B S; Kishbaugh, Scott A; Lapierre, Jean-Francois; Lathrop, Barbara; Latimore, Jo A; Lee, Yuehlin; Lottig, Noah R; Lynch, Jason A; Matthews, Leslie J; McDowell, William H; Moore, Karen E B; Neff, Brian P; Nelson, Sarah J; Oliver, Samantha K; Pace, Michael L; Pierson, Donald C; Poisson, Autumn C; Pollard, Amina I; Post, David M; Reyes, Paul O; Rosenberry, Donald O; Roy, Karen M; Rudstam, Lars G; Sarnelle, Orlando; Schuldt, Nancy J; Scott, Caren E; Skaff, Nicholas K; Smith, Nicole J; Spinelli, Nick R; Stachelek, Joseph J; Stanley, Emily H; Stoddard, John L; Stopyak, Scott B; Stow, Craig A; Tallant, Jason M; Tan, Pang-Ning; Thorpe, Anthony P; Vanni, Michael J; Wagner, Tyler; Watkins, Gretchen; Weathers, Kathleen C; Webster, Katherine E; White, Jeffrey D; Wilmes, Marcy K; Yuan, Shuai

    2017-12-01

    Understanding the factors that affect water quality and the ecological services provided by freshwater ecosystems is an urgent global environmental issue. Predicting how water quality will respond to global changes not only requires water quality data, but also information about the ecological context of individual water bodies across broad spatial extents. Because lake water quality is usually sampled in limited geographic regions, often for limited time periods, assessing the environmental controls of water quality requires compilation of many data sets across broad regions and across time into an integrated database. LAGOS-NE accomplishes this goal for lakes in the northeastern-most 17 US states.LAGOS-NE contains data for 51 101 lakes and reservoirs larger than 4 ha in 17 lake-rich US states. The database includes 3 data modules for: lake location and physical characteristics for all lakes; ecological context (i.e., the land use, geologic, climatic, and hydrologic setting of lakes) for all lakes; and in situ measurements of lake water quality for a subset of the lakes from the past 3 decades for approximately 2600-12 000 lakes depending on the variable. The database contains approximately 150 000 measures of total phosphorus, 200 000 measures of chlorophyll, and 900 000 measures of Secchi depth. The water quality data were compiled from 87 lake water quality data sets from federal, state, tribal, and non-profit agencies, university researchers, and citizen scientists. This database is one of the largest and most comprehensive databases of its type because it includes both in situ measurements and ecological context data. Because ecological context can be used to study a variety of other questions about lakes, streams, and wetlands, this database can also be used as the foundation for other studies of freshwaters at broad spatial and ecological scales. © The Author 2017. Published by Oxford University Press.

  4. Issues surrounding HIV status disclosure: Experiences of seropositive women in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Oluwaseun E Oseni

    2017-01-01

    Full Text Available Background: Disclosure of human immunodeficiency virus (HIV seropositivity by infected women is crucial in HIV control. To determine the rates, patterns, effects, and determinants of disclosure of status among HIV-positive women in Lagos, Nigeria. Methods: This was a descriptive cross-sectional study. Simple random sampling method was used to select 364 HIV-positive women accessing care in HIV treatment centers in Lagos Island. Data were collected using interviewer-administered questionnaires and analyzed with Epi Info (version 3.5.3. Inferential statistics done was Chi-square test and level of statistical significance was set at <5%. Results: Mean age of respondents was 37.3 ± 3 years, and most were married or cohabiting in monogamous families. The disclosure rates were 81.9% to anyone (excluding a health care professional; 60.4% to spouse/sexual partners; and 67.7% disclosed on the same day of diagnosis. Main reasons for disclosure were failing health (49.3% and a sense of responsibility to the spouse/sexual partner (33.6%. Major reasons for nondisclosure were negative public opinion (84.8% and fear of losing relationships (40.3%. Positive reactions following disclosure were mostly acceptance: 75.2% (family member and 72.3% (spouse/sexual partner while blame was the main negative outcome. Longer duration of diagnosis significantly improved disclosure to anyone (P < 0.001. Older age (P < 0.001 and awareness of spouse/sexual partner's HIV status (P < 0.001 significantly improved disclosure to spouse/sexual partner. Conclusions: Many respondents had not disclosed their status and require support and counseling to do so. Community education regarding stigmatization should be intensified.

  5. Human papillomavirus (HPV) infection and vaccines: knowledge, attitude and perception among female students at the University of Lagos, Lagos, Nigeria.

    Science.gov (United States)

    Makwe, Christian Chigozie; Anorlu, Rose Ihuoma; Odeyemi, Kofoworola Abimbola

    2012-12-01

    This study sought to determine knowledge of and attitude towards human papillomavirus (HPV) infection, HPV-related diseases and HPV vaccines among female undergraduate students at the University of Lagos. A self-administered questionnaire was administered between May and July 2010, to 368 female students aged 16-29years, who were selected from two faculties of the University of Lagos using two-stage sampling method. Data collected included: socio-demographic characteristics, sexual history, awareness and knowledge of HPV infection, cervical cancer and genital warts, and HPV vaccine; the perceived risk of acquiring genital HPV infection and developing cervical cancer or genital warts, and the willingness to receive an HPV vaccine. Only 64 (17.7%) and 52 (14.4%) of the students had ever heard of HPV infection and HPV vaccines respectively. The median HPV knowledge on a 15-item score was 2. Overall, only 11.1% knew that genital HPV infection can cause cervical cancer. Fourteen (6.9%) of those who were aware of cervical cancer agreed they were at risk of developing the disease. Of the 52 students who had heard of the HPV vaccine, 24 (46.2%) knew it was given for cervical cancer prevention and 30 (57.7%) expressed their willingness to receive the vaccine. The knowledge of and the perceived susceptibility to HPV infection and HPV-related diseases among female students in the University of Lagos were generally low. The need for a well-designed HPV-educational program to bridge the knowledge gap cannot be overemphasized. Copyright © 2012 Ministry of Health, Saudi Arabia. Published by Elsevier Ltd. All rights reserved.

  6. Trip to Lago Nero (Tusco-Emilian Apennine, Italy): How has our Apennine been changing?

    Science.gov (United States)

    Papini, Piera; Vergari, Simone

    2014-05-01

    The sharp division of disciplines in Italian Secondary school is a problem which hinders the natural learning of pupils. At the end of the 1st education cycle, candidates must stand six written tests and an oral exam during which they present a topic that includes a lot of disciplines and that they develop unifying what they have been taught fragmentarily. Climate changes that are taking place and the use of Earth resources are a significant topic suitable for a multidisciplinary as well as interdisciplinary approach. Thanks to the Region of Tuscany, which has financed the Educational Contract " An agreement for water" (2012-2015), we could develop this module which involves 14 years old students and is focused on the climate change evidence in a lake, Lago Nero, originated in the Tusco-Emilian Apennine during the development of an ancient Wurmian glacier. The didactical path includes: - lessons in the classroom on weather, climate and climate changes caused both by nature and by man. - A focus on Lago Nero - A trip to Lago Nero, observation of the landscape geomorphology: differences between fluvial valleys and glacial valleys, signs of remote events such as roche mountonnée or recent ones such as landslides and floods caused by intense rainfalls. Collection of samples. - Participation at a conference organized by the Region at San Giorgio Library in Pistoia ( http://rinnoviamoci2011.blogspot.it/ ) during which students met some administrators and talked with them. A video made by the pupils was presented on this occasion. http://www.icsfrankcarradori.it/studenti/ Further activities include: - Open day for families of the younger pupils, during which older pupils explained some of the activities carried out, included the module on Lago Nero. - identification of minerals (connection with Chemestry) - identification of rocks outcropping in the area of the lake: what do they tell about geologic history of our mountains? How can they reveal the age of a geologic

  7. blaCTX-M-I group extended spectrum beta lactamase-producing Salmonella typhi from hospitalized patients in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Akinyemi KO

    2015-05-01

    Full Text Available Kabiru O Akinyemi,1 Bamidele A Iwalokun,2 Olajide O Alafe,1 Sulaiman A Mudashiru,1 Christopher Fakorede,11Department of Microbiology, Lagos State University, Ojo, Lagos, Nigeria; 2Biochemistry and Nutrition Division, Nigerian Institute of Medical Research, Yaba, Lagos, NigeriaPurpose: The global spread of blaCTX-M-I extended-spectrum beta-lactamase (ESBL-producing Salmonella spp. remains a major threat to treatment and control. Evidence of emergence and spread of this marker are lacking in Nigeria. This study investigated blaCTX-M-I ESBL production among Salmonella isolates from hospitalized patients.Methods: Patients (158 total made up of two groups were evaluated. Group A was composed of 135 patients with persistent pyrexia and group B was composed of 23 gastroenteritis patients and their stool samples. Samples were cultured, and isolates were identified and were subjected to antibiotic susceptibility testing by standard methods. Isolates were further screened for ESBL production, blaCTX-M-I genes and transferability by double disk synergy test, plasmid extraction, polymerase chain reaction, and conjugation experiment.Results: Thirty-five (25.9% Salmonella isolates were identified from group A, of which 74.3% were S. typhi, 22.9% were S. paratyphi and two (5.7% were invasive non-typhoidal S. enteritidis. Nine Plasmodium falciparum infections were recorded, four of which were identified as co-infections with typhoidal Salmonella. Only two (8.7% S. enteritidis samples were obtained from group B (P>0.05. A total of 24 isolates were ESBL-positive, eliciting resistance to five to seven antibiotics, and were multiple-drug resistant. ESBL production due to the blaCTX-M-I gene cluster was detected in eleven (45.8% Salmonella isolates. Nine (81.8% of the eleven blaCTX-M-I ESBL producers were S. typhi and two (18.2% isolates were S. enteritidis. Four of nine S. typhi blaCTX-M-I ESBL-producing strains harbored 23 kb self-transmissible plasmid that was co

  8. Potential drug–drug interactions in HIV-infected children on antiretroviral therapy in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Oshikoya KA

    2014-04-01

    Full Text Available Kazeem A Oshikoya,1 Ibrahim A Oreagba,2 Saheed Lawal,2 Olufunsho Awodele,2 Olayinka O Ogunleye,1 Idowu O Senbanjo,3 Sunday O Olayemi,2 Veronica C Ezeaka,4,5 Edamisan O Temiye,4,5 Titilope A Adeyemo,4,6 Oluranti Opanuga,4,7 Olufunmilayo A Lesi,4,8 Sulaimon A Akanmu4,6 1Department of Pharmacology, Lagos State University College of Medicine, Ikeja, Lagos, Nigeria; 2Department of Pharmacology, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria; 3Department of Paediatrics, Lagos State University College of Medicine, Ikeja, Lagos, Nigeria; 4APIN Clinic, Lagos University Teaching Hospital, Lagos, Nigeria; 5Department of Paediatrics, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria; 6Department of Haematology and Blood Transfusion, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria; 7Department of Pharmacy, Lagos University Teaching Hospital, Idi-Araba Lagos, Nigeria; 8Department of Medicine, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria Background: Multi-therapy is common in HIV-infected children, and the risk for clinically significant drug interactions (CSDIs is high. We investigated the prevalence of CSDIs between antiretroviral (ARV and co-prescribed drugs for children attending a large HIV clinic in Lagos, Nigeria. Methods: The case files of pediatric patients receiving treatment at the HIV clinic of the Lagos University Teaching Hospital (LUTH, Idi-Araba, between January 2005 and December 2010 were reviewed. The ARV and co-prescribed drug pairs were evaluated for potential interactions using the Liverpool HIV Pharmacology Group website. The potential interactions were rated as A (no known interaction, B (minor/no action needed, C (moderate/monitor therapy, D (major/therapy modification, and X (contraindicated/avoid combination. Results: Of the 310 cases reviewed, 208 (67.1% patients were at risk of CSDIs. Artemisinin-based combination therapy was prescribed for over one

  9. Assessment of predatory ability of native and non-native freshwater gammaridean species: A rapid test with water fleas as prey

    OpenAIRE

    B.E.M.W. STOFFELS, J.S. TUMMERS, G. VAN DER VELDE, D. PLATVOET, H.W.M. HENDRIKS, R.S.E.W. LEUVEN

    2011-01-01

    Predation rate with relation to species, sex and water temperature was tested among four different gammaridean species: Dikerogammarus villosus, Gammarus roeselii, Gammarus pulex and Gammarus fossarum. Tests were performed in microcosms in climate-controlled rooms at five different temperatures. Daphnia magna, a common water flea, served as prey. On ave- rage D. villosus showed the highest consumption rate of Daphnia magna over the entire temperature range, followed in decreasing order by G...

  10. Iron stores in regular blood donors in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Adediran A

    2013-06-01

    Full Text Available Adewumi Adediran,1 Ebele I Uche,2 Titilope A Adeyemo,1 Dapus O Damulak,3 Akinsegun A Akinbami,4 Alani S Akanmu1 1Department of Hematology and Blood Transfusion, University of Lagos, Lagos, Nigeria; 2Department of Hematology and Blood Transfusion, Lagos University Teaching Hospital, Lagos, Nigeria; 3Department of Hematology and Blood Transfusion, Jos University Teaching Hospital, Jos, Nigeria; 4Department of Hematology and Blood Transfusion, Lagos State University, Ikeja, Nigeria Background: Apart from challenging the bone marrow to increase its red cell production, thereby producing more blood for the donor, regular blood donation has been shown to have several benefits, one of which is preventing accumulation of body iron which can cause free radical formation in the body. This study was carried out to assess body iron stores in regular blood donors. Methods: A total of 52 regular (study and 30 first-time (control volunteer blood donors were studied prospectively. Twenty milliliters of venous blood was drawn from each subject, 5 mL of which was put into sodium ethylenediamine tetra-acetic acid specimen bottles for a full blood count, including red blood cell indices. The remaining sample was allowed to clot in a plain container, and the serum was then retrieved for serum ferritin, serum iron, and serum transferrin receptor measurement by enzyme-linked immunosorbent assay. Results: Mean hemoglobin and packed cell volume in the study group (13.47 ± 2.36 g/dL and 42.00 ± 7.10, respectively, P = 0.303 were not significantly higher than in the control group (12.98 ± 1.30 g/dL and 39.76 ± 4.41, respectively, P = 0.119. Mean serum ferritin was 102.46 ± 80.26 ng/mL in the control group and 41.46 ± 40.33 ng/mL in the study group (P = 0.001. Mean serum ferritin for women in the study group (28.02 ± 25.00 ng/mL was significantly lower than for women in the control group (56.35 ± 34.03 ng/mL, P = 0.014. Similarly, men in the study group had a lower

  11. Assessment of predatory ability of native and non-native freshwater gammaridean species: A rapid test with water fleas as prey

    Directory of Open Access Journals (Sweden)

    B.E.M.W. STOFFELS, J.S. TUMMERS, G. VAN DER VELDE, D. PLATVOET, H.W.M. HENDRIKS, R.S.E.W. LEUVEN

    2011-12-01

    Full Text Available Predation rate with relation to species, sex and water temperature was tested among four different gammaridean species: Dikerogammarus villosus, Gammarus roeselii, Gammarus pulex and Gammarus fossarum. Tests were performed in microcosms in climate-controlled rooms at five different temperatures. Daphnia magna, a common water flea, served as prey. On ave- rage D. villosus showed the highest consumption rate of Daphnia magna over the entire temperature range, followed in decreasing order by G. pulex, G. roeselii and G. fossarum. The predation rate of all species showed a distinct peak at 20°C. Correction of predation rates for body size gave somewhat different results. D. villosus is then still the most predatory of all gammaridean species tested followed by G. pulex, G. fossarum and G. roeselii. The outcome of the Daphnia tests is consistent with results of other studies with different prey. This supports that the Daphnia test is a good and quick indicator of the predatory abilities in gammaridean species at varying temperatures, and allows the prediction of how changing temperature regimes influence invasion impacts [Current Zoology 57 (6: 836–843, 2011].

  12. Modelos numéricos y teledetección en el lago de Izabal, Guatemala

    OpenAIRE

    Medina Mazariegos, Camilo Ernesto

    2009-01-01

    Los recursos hídricos son un elemento clave pai-a sustentar el desarrollo sostenible de la humanidad, y el conocimiento adecuado dé los procesos que los rigen es la base para tomar decisiones acertadas respecto a su manejo. Esta Tesis Doctoral tiene como objeto de estudio el Lago de Izabal, que es el lago de mayor extensión en Guatemala. A pesar de la importancia económica y social de este cuerpo de agua, la infonnación relacionada con la dinámica ambiental del lago es deficiente. El objet...

  13. Salting our freshwater lakes

    Science.gov (United States)

    Bartlett, Sarah L.; Burke, Samantha M.; Doubek, Jonathan P.; Krivak-Tetley, Flora E.; Skaff, Nicholas K.; Summers, Jamie C.; Farrell, Kaitlin J.; McCullough, Ian M.; Morales-Williams, Ana M.; Roberts, Derek C.; Ouyang, Zutao; Scordo, Facundo; Hanson, Paul C.; Weathers, Kathleen C.

    2017-01-01

    The highest densities of lakes on Earth are in north temperate ecosystems, where increasing urbanization and associated chloride runoff can salinize freshwaters and threaten lake water quality and the many ecosystem services lakes provide. However, the extent to which lake salinity may be changing at broad spatial scales remains unknown, leading us to first identify spatial patterns and then investigate the drivers of these patterns. Significant decadal trends in lake salinization were identified using a dataset of long-term chloride concentrations from 371 North American lakes. Landscape and climate metrics calculated for each site demonstrated that impervious land cover was a strong predictor of chloride trends in Northeast and Midwest North American lakes. As little as 1% impervious land cover surrounding a lake increased the likelihood of long-term salinization. Considering that 27% of large lakes in the United States have >1% impervious land cover around their perimeters, the potential for steady and long-term salinization of these aquatic systems is high. This study predicts that many lakes will exceed the aquatic life threshold criterion for chronic chloride exposure (230 mg L−1), stipulated by the US Environmental Protection Agency (EPA), in the next 50 y if current trends continue. PMID:28396392

  14. Trace element concentrations in freshwater mussels and macrophytes as related to those in their environment

    Directory of Open Access Journals (Sweden)

    Gian Maria BEONE

    2003-02-01

    Full Text Available This study was primarily designed to contribute to the debate "Do accumulator species reflect the element contamination level of their environment?" This research was carried out: 1 to know the distribution of 15 trace elements and calcium in shell and soft tissues of three species of freshwater mussels and macrophytes; 2 to compare the accumulation capacity of each trace element by mussels and by eight species of macrophytes and 3 to test the relationships between the metal concentrations in the mussels and macrophytes and those in water and sediments. The variability of element residues in the mussels is the major limit to accumulator monitoring. The most important causes are: seasonal cycle, physical environment and biological factors such as the size, age and growth rate. This research was designed to eliminate the consequence of variability deriving from the season and the environment. To this end the mussels and macrophytes were collected at the same time from the same habitat: Ranco Bay, Lago Maggiore, Northern Italy. In addition, the element concentrations in more size-classes of the most abundant mussel species (Unio pictorum and Dreissena polymorpha were measured. Trace elements were analyzed by Inductive Coupled Plasma-Mass Spectrometry (ICP-MS. By arranging the data in sequences of decreasing element concentrations in the organisms as well as in water and sediments, we were able to compare the accumulating ability of the tested species and evaluate their capacity to reflect environmental availability. Neither the sequences in the shell nor those in the tissues were similar to the sequence in the water. The differences between the sequences of the mussel tissues and those of the sediments were less striking than those between shells and sediments. Similar results were obtained by macrophytes. In conclusion, the results of this study (which mimics the monitoring practice prove that bioaccumulators cannot be used to evaluate the

  15. Property-use conversion in Lagos metropolis in the context of the ...

    African Journals Online (AJOL)

    regionalizing Lagos into different genres of metropolises can change the capability of the model which attempts to predict use-conversion for the metropolis; including exploring the relevance of the obtained results for enhancing physical development ...

  16. Data points, corresponding to the bathymetric survey of Lago Lucchetti, Puerto Rico, September 2013-May 2014

    Data.gov (United States)

    Department of the Interior — The U.S. Geological Survey conducted a sedimentation survey of Lago Lucchetti, Yauco, Puerto Rico, in 2013–14 in cooperation with the Puerto Rico Aqueduct and Sewer...

  17. Shapefile of the bathymetric contours of Lago Lucchetti, Puerto Rico, September 2013-May 2014

    Data.gov (United States)

    Department of the Interior — The U.S. Geological Survey conducted a sedimentation survey of Lago Lucchetti, Yauco, Puerto Rico, in 2013–14 in cooperation with the Puerto Rico Aqueduct and Sewer...

  18. LBA-ECO LC-07 Bathymetric Survey of Floodplain Lake, Lago Curuai, Para, Brazil: 2004

    Data.gov (United States)

    National Aeronautics and Space Administration — The bathymetry data provided represent a continuous surface of interpolated point measurements of depth values of Lago Curuai, an Amazon River floodplain lake,...

  19. LBA-ECO LC-07 Bathymetric Survey of Floodplain Lake, Lago Curuai, Para, Brazil: 2004

    Data.gov (United States)

    National Aeronautics and Space Administration — ABSTRACT: The bathymetry data provided represent a continuous surface of interpolated point measurements of depth values of Lago Curuai, an Amazon River floodplain...

  20. Individual Attitude toward Recycling of Municipal Solid Waste in Lagos, Nigeria.

    OpenAIRE

    Tunmise A. Otitoju

    2014-01-01

    Attitudes of the waste generators in the community appears to be critical as their points of understanding in waste recycling eventually play a significant role in providing answers to municipal solid waste management problems in Lagos State. Individual involvement has a direct bearing on an effective recycling practice. This study investigates factors influencing individual waste recycling performance and their likelihood to participation in Lagos State. This paper presents the results of th...

  1. Use of insecticide-treated mosquito nets for children under five years in an urban area of Lagos State, Nigeria.

    Science.gov (United States)

    Okafor, I P; Odeyemi, K A

    2012-01-01

    Insecticide-treated nets (ITNs) have proven to be one of the most effective means of reducing malaria morbidity and mortality in children and pregnant women. This study is carried out to determine the practice and determinants of ITN use for children under five years among care givers in an urban area of Lagos State. A community-based, cross sectional study was carried out in Lagos State in April 2007 among three hundred and forty (340) care givers primarily responsible for child care at home. They were selected by a multi-stage sampling method using a pre-tested, interviewer-administered, structured questionnaire. ITN use rate for under-fives was high (61.8%) and this was significantly determined by care giver's marital status (P level of care giver and occupation of head of the household were not significant determinants. There is need for health campaigns on ITNs targeted at unmarried care givers of young children. In addition, we also recommend social marketing of modern family planning methods to reduce family size, thereby increasing chances of ITN use among children less than five years to reduce malaria burden.

  2. Comparative assessment of blood lead levels of automobile technicians in organised and roadside garages in Lagos, Nigeria.

    Science.gov (United States)

    Saliu, Abdulsalam; Adebayo, Onajole; Kofoworola, Odeyemi; Babatunde, Ogunowo; Ismail, Abdussalam

    2015-01-01

    Occupational exposure to lead is common among automobile technicians and constitutes 0.9% of total global health burden with a majority of cases in developing countries. The aim of this study was to determine and compare the blood lead levels of automobile technicians in roadside and organised garages in Lagos State, Nigeria. This was a comparative cross-sectional study. Data were collected using interviewer-administered questionnaires. Physical examinations were conducted and blood was analysed for lead using atomic spectrophotometery. Statistical analyses were performed to compare the median blood lead levels of each group using the independent sample (Mann-Whitney U) test. Seventy-three (40.3%) of the organised compared to 59 (34.3%) of the roadside groups had high blood lead levels. The organised group had statistically significant higher median blood lead levels of, 66.0 µg/dL than the roadside 43.5 µg/dL (P Automobile technicians in organised garages in Lagos have higher prevalence of elevated blood lead levels and higher median levels than the roadside group. Preventive strategies against lead exposures should be instituted by the employers and further actions should be taken to minimize exposures, improve work practices, implement engineering controls (e.g., proper ventilation), and ensure the use of personal protective equipment.

  3. Colonoscopy Practice in Lagos, Nigeria: A Report of an Audit

    Directory of Open Access Journals (Sweden)

    C. A. Onyekwere

    2013-01-01

    Full Text Available Background. Colonoscopy effectiveness depends on the quality of the examination. Community-based report of quality of colonoscopy practice in a developing country will help in determining standard and also serve as a stimulus for improvement in service. Aim. To review the quality of colonoscopy practice and document pattern of colonic disease including polyp detection rate in Lagos, Nigeria. Method. A protocol that captured the patients’ demographics, indication, and some quality indices of colonoscopy was developed and sent to all the identified colonoscopy units in Lagos to complete for all procedures performed between January 2011 and June 2012. All data were collated and analyzed. The quality indices studied were compared with guideline standard. Results. Twelve colonoscopy centers were identified but only nine centers responded. The gastroenterologist/endoscopists were physicians (3 and surgeons (5. Six hundred and seven colonoscopy procedures were performed during this period (M : F = 333 : 179 while the sex was not disclosed in 95 subjects. The examination indications were lower GI bleeding (24.2%, altered bowel habits (9.2%, lower abdominal pain (9.1%, screening for CRC (4.3% and unspecified (46.8%. Conscious sedation was generally used while bowel preparation (good in 81.4% was done with low residue diet and stimulant laxatives. Caecal intubation rate was 81.2%. Common endoscopic findings were haemorrhoids (43.2%, polyps/masses (13.4%, diverticulosis (11.1%, and no abnormality (23.4%. Polyp was detected in 6.8% of cases. Conclusion. Colonoscopy utilization is low, and the quality of practice is suboptimal; although limited resources could partly explain this, however it is not clear if the low rate of polyp detection is due to missed lesions or low population incidence.

  4. Rabia transmitida por murciélagos en Brasil

    Directory of Open Access Journals (Sweden)

    Willian Oliveira Fahl

    2015-09-01

    Full Text Available Frente al desafío que la rabia representa para la industria pecuaria y la salud pública en América Latina, el presente artículo tiene como objetivo hacer una revisión de literatura amplia y crítica sobre la epidemiología de la rabia transmitida por murciélagos en Brasil. El tema es abordado inicialmente desde una perspectiva histórica hasta la caracterización molecular de aislamientos del virus, para finalmente contrastar con la situación de otros países de las Américas. La información referente a Brasil es presentada de manera separada debido a la gran abundancia de especies de murciélagos de diversos hábitos alimenticios, implicadas en la transmisión del virus de la rabia y las complejas relaciones entre los ciclos epidemiológicos revelados por estudios de tipificación antigénica y análisis filogenético, lo  cual ha permitido reconocer con más nitidez, la importancia de los quirópteros como reservorios y transmisores de esta enfermedad.  Este nuevo escenario epidemiológico exige reexaminar las medidas de control aplicadas hasta el momento, desde un abordaje multidisciplinar, así como cooperación intersectorial y participación por parte de la comunidad.

  5. [Geographic variations in freshwater molluscs].

    Science.gov (United States)

    Vinarskiĭ, M V

    2012-01-01

    The phenomenon of geographic variation is known in practically all taxa of living beings. However, the reality of this phenomenon in freshwater molluscs (snails and bivalves) has many times been questioned in the past. It was accepted that these animals do not demonstrate spatially-oriented variation, where specific "local race" is arisen in each specific habitat. Till the beginning of 1970s, there was no statistical evidence that geographic clines in freshwater molluscs really exist. However, a few species of freshwater molluscs has been studied in this respect so far, therefore it is almost impossible to draw any general patterns of geographical variation in this group of animals. Most species of freshwater molluscs studied to the date exhibit statistically significant decrease of their body size in the south-north direction. Perhaps, it may be explained by decrease of the duration of the growth season in high latitudes. Some species of freshwater snails demonstrate clinal changes in shell proportions. This allows to reject subspecies separation within these species since diagnostic characters of such "subspecies" may blur when geographic variation is taken into consideration. The data on geographic variation in anatomical traits in freshwater molluscs is much more scarce. At least one species of pond snails (Lymnaea terebra) demonstrates clinal variation in proportions of the copulative apparatus in the south-north direction. Further studies of geographic variation in freshwater molluscs should reveal whether it is truly adaptive, i.e. whether geographical clines have underlying genetic basis. Otherwise, the clines may arise as a result of direct modifying effect of a habitat.

  6. The Socio-cultural Causes of Male Victimisation in Domestic Contexts in Lagos, Nigeria: A Qualitative Analysis

    OpenAIRE

    Ayodele, Johnson Oluwole

    2017-01-01

    This paper examines the factors that predispose men to female-perpetrated violence in Lagos, Nigeria. Using snowball sampling, it purposively selected one case study, one key informant and two in-depth interview participants from each of the three Senatorial Districts of Lagos. Data were content analysed. Findings indicated that male victims of domestic violence abound in Lagos; stigmatisation causes male victims’ non-disclosure; and female aggressors sometimes used traditional mechanisms to ...

  7. Cambios institucionales para preservar la cantidad y la calidad del agua en la cuenca del Lago de Tota

    OpenAIRE

    Chaparro Valderrama, Jairo

    2013-01-01

    Diversos estudios realizados durante las últimas décadas en la cuenca del lago de Tota, han identificado, por una parte, un crecimiento de la demanda de agua acompañado de una reducción en su oferta -especialmente durante el verano-, y, por la otra, procesos crecientes, aunque focalizados, de contaminación del agua en los afluentes del lago y en el lago mismo.

  8. Davis Pond freshwater prediversion biomonitoring study: freshwater fisheries and eagles

    Science.gov (United States)

    Jenkins, Jill A.; Bourgeois, E. Beth; Jeske, Clint W.

    2008-01-01

    pesticides and other contaminants. Biomarker data on individual fish, generated at the USGS National Wetlands Research Center (Lafayette, La.), included percent white blood cells in whole blood, spleen weight to body weight ratio, liver weight to body weight ratio, condition factor, splenic macrophage aggregates, and liver microsomal 7-ethoxyresorufin-o-deethylase (EROD) activity. Fish age was estimated by comparing total lengths with values from the same species in the Southeast United States as determined from the literature. Contaminant analyses were coordinated by the U.S. Fish and Wildlife Service (USFWS) Analytical Control Facility (Laurel, Md.), where residues of organochlorine (OC) pesticides, total polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), aliphatic hydrocarbons (AHs), and trace elements were determined. The organic contaminant data were generated at the Mississippi State University Chemical Lab (Mississippi State, Miss.), and the inorganic contaminant data were generated by the Texas A&M University Geochemical and Environmental Research Group (College Station, Tex.). Statistical tests were performed to assess relationships among contaminants, fish age, fish species, and collection sites. Trends in interspecific differences among fish in concentrations of contaminants were noted. Striped mullet (hereafter mullet) frequently displayed the highest chemical concentrations. Levels of contaminants were generally higher in samples obtained from the Mississippi River than in those collected from the diversion area and were higher in mussels and clams (hereafter bivalves) than in fish. Because the Mississippi River sampling site for mullet and largemouth bass was downriver of the structure and south of New Orleans and the catfish site was upriver, the downriver data may not be directly reflective of the results from the receiving waters at the Davis Pond structure. Compared to the Caernarvon freshwater prediversion study in 1990 that

  9. Desalination - an alternative freshwater resource

    International Nuclear Information System (INIS)

    Shakaib, M.

    2005-01-01

    Global water constitutes 94 percent salt water that is from the oceans and 6% is in the form of freshwater. Out of this 6% freshwater approximately 27% is trapped in glaciers and 72% is underground. The sea water is important for transportation, fisheries. Oceans regulate climate through air sea interaction. However direct consumption of sea water is too salty to sustain human life. Water with a dissolved solids (salt) content generally below about 1000 milligrams per liter (mg/L) is considered acceptable for human consumption. The application of desalting technologies over the past 50 years have been in many of the arid zone where freshwater is available. Pakistan lies in the Sun Belt. It is considered a wide margin coastal belt (990 km), having an Exclusive Economic Zone of 240,000 km/sup 2/, that strokes trillion cubic meters of sea water that can be made available as freshwater source to meet the shortfall in the supply of domestic water through desalination along the coastal belt of Pakistan. The freshwater obtained from the other desalination processes is slightly expensive, but the cost of desalination can be considerably reduced provided that the available inexpensive or free waste energy is utilized mainly. (author)

  10. Long-term survival of an urban fruit bat seropositive for Ebola and Lagos bat viruses.

    Directory of Open Access Journals (Sweden)

    David T S Hayman

    2010-08-01

    Full Text Available Ebolaviruses (EBOV (family Filoviridae cause viral hemorrhagic fevers in humans and non-human primates when they spill over from their wildlife reservoir hosts with case fatality rates of up to 90%. Fruit bats may act as reservoirs of the Filoviridae. The migratory fruit bat, Eidolon helvum, is common across sub-Saharan Africa and lives in large colonies, often situated in cities. We screened sera from 262 E. helvum using indirect fluorescent tests for antibodies against EBOV subtype Zaire. We detected a seropositive bat from Accra, Ghana, and confirmed this using western blot analysis. The bat was also seropositive for Lagos bat virus, a Lyssavirus, by virus neutralization test. The bat was fitted with a radio transmitter and was last detected in Accra 13 months after release post-sampling, demonstrating long-term survival. Antibodies to filoviruses have not been previously demonstrated in E. helvum. Radio-telemetry data demonstrates long-term survival of an individual bat following exposure to viruses of families that can be highly pathogenic to other mammal species. Because E. helvum typically lives in large urban colonies and is a source of bushmeat in some regions, further studies should determine if this species forms a reservoir for EBOV from which spillover infections into the human population may occur.

  11. Radurization of commercial freshwater fish species

    International Nuclear Information System (INIS)

    Chuaqui-Offermanns, N.; McDougall, T.E.; Sprung, W.; Sullivan, V.

    1988-01-01

    The effect of radurization on the shelf life of fresh Whitefish obtained through ordinary commercial channels has been determined. Whitefish fillets irradiated at 1.2 kGy and stored at 3 0 C have a shelf life three times longer than the unirradiated fish. When the fish was irradiated at 0.82 kGy a two fold shelf-life extension was obtained. The shelf life was estimated by sensory, chemical and microbiological evaluations. Sensory evaluation involved organoleptic assessment of raw and cooked samples. Since freshwater fish do not contain trimethylamine oxide (TMAO), alternate tests for freshness were required. It was found the determination of hypoxanthine and total volatile acid number (VAN) are excellent tests for freshness and quality of freshwater fish; thus, these analyses were adopted. The degree of radiation-induced lipid oxidation was measured by the thiobarbituric acid test (TBA). It was found at doses of 0.82 and 1.2 kGy the TBA number remained within acceptable limits in all samples. Microbiological analyses consisted of the total microbial load assessment in the sample, as well as Pseudomonas and total psychrotrophic counts. The estimated shelf lives as determined by the three separate evaluations were in very good agreement. (author)

  12. Ecotoxicity of engineered nanoparticles to freshwater organisms

    DEFF Research Database (Denmark)

    Hartmann, Nanna Isabella Bloch

    A large variety of societal benefits are expected from the development and use of engineered nanoparticles. At present, the majority of ‘nano-products’ put on the market can be classified as consumer products, whereas future applications are expected to have more widespread and societal benefits...... in relation to appropriate test methods for identifying potential adverse effects of nanoparticles; this is of great relevance from both a scientific and regulatory point of view. An important aspect of this project was the acquisition of experience in testing nanoparticles in aqueous test systems – both...... with freshwater filter feeder Daphnia magna, sediment feeder Lumbriculus variegatus and green alga Pseudokirchneriella subcapitata. The results made it possible to identify major scientific and methodological challenges in the testing of nanoparticles compared to ‘conventional’ chemicals. It has been highlighted...

  13. Native Freshwater Fish and Mussel Species Richness

    Data.gov (United States)

    U.S. Environmental Protection Agency — These data represent predicted current distributions of all native freshwater fish and freshwater mussels in the Middle-Atlantic region. The data are available for...

  14. Identification and characterization of microsporidia from fecal samples of HIV-positive patients from Lagos, Nigeria.

    Directory of Open Access Journals (Sweden)

    Oladele Teslim Ojuromi

    Full Text Available BACKGROUND: Microsporidia are obligate intracellular parasites that infect a broad range of vertebrates and invertebrates. They have been increasingly recognized as human pathogens in AIDS patients, mainly associated with a life-threatening chronic diarrhea and systemic disease. However, to date the global epidemiology of human microsporidiosis is poorly understood, and recent data suggest that the incidence of these pathogens is much higher than previously reported and may represent a neglected etiological agent of more common diseases indeed in immunocompetent individuals. To contribute to the knowledge of microsporidia molecular epidemiology in HIV-positive patients in Nigeria, the authors tested stool samples proceeding from patients with and without diarrhea. METHODOLOGY/PRINCIPAL FINDINGS: Stool samples from 193 HIV-positive patients with and without diarrhea (67 and 126 respectively from Lagos (Nigeria were investigated for the presence of microsporidia and Cryptosporidium using Weber's Chromotrope-based stain, Kinyoun stain, IFAT and PCR. The Weber stain showed 45 fecal samples (23.3% with characteristic microsporidia spores, and a significant association of microsporidia with diarrhea was observed (O.R. = 18.2; CI: 95%. A similar result was obtained using Kinyoun stain, showing 44 (31,8% positive samples with structures morphologically compatible with Cryptosporidium sp, 14 (31.8% of them with infection mixed with microsporidia. The characterization of microsporidia species by IFAT and PCR allowed identification of Enterocytozoon bieneusi, Encephalitozoon intestinalis and E. cuniculi in 5, 2 and 1 samples respectively. The partial sequencing of the ITS region of the rRNA genes showed that the three isolates of E.bieneusi studied are included in Group I, one of which bears the genotype B. CONCLUSIONS/SIGNIFICANCE: To our knowledge, this is the first report of microsporidia characterization in fecal samples from HIV-positive patients from

  15. Arctic freshwater export: Status, mechanisms, and prospects

    NARCIS (Netherlands)

    Haine, T.W.N.; Curry, B.; Gerdes, R.; Hansen, E.; Karcher, M.; Lee, C.; Rudels, B.; Spreen, G.; de Steur, L.; Stewart, K.D.; Woodgate, R.

    2015-01-01

    Large freshwater anomalies clearly exist in the Arctic Ocean. For example, liquid freshwater has accumulated in the Beaufort Gyre in the decade of the 2000s compared to 1980–2000, with an extra ˜ 5000 km3 — about 25% — being stored. The sources of freshwater to the Arctic from precipitation and

  16. Freshwater sculpins: phylogenetics to ecology

    Science.gov (United States)

    Susan B. Adams; David A. Schmetterling

    2007-01-01

    Freshwater sculpins (Cottidae) are a diverse and ecologically important component of cool- and coldwater ecosystems throughout the northern hemisphere. More than 60 sculpin species occur in a variety of habitats, and sculpin distributions range from highly localized to widespread. Despite the frequently high biomass of sculpins and their numerous ecosystem functions,...

  17. Electrocardiographic Study in Adult Homozygous Sickle Cell Disease Patients in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Adedoyin Dosunmu

    2016-01-01

    Full Text Available Background. This study sought to identify the pattern of electrocardiographic changes in steady state adult sickle cell anaemia. Methods. A case-control, cross-sectional study was conducted amongst sickle cell patients attending the sickle cell clinic of Lagos State University Teaching Hospital, Ikeja, and HbAA controls. All consenting participants had haemoglobin electrophoresis done and were subjected to electrocardiography (ECG. The descriptive data were given as means ± standard deviation (SD. The differences were considered to be statistically significant when the p value obtained was <0.05. Results. A total of ninety-three sickle cell anaemia (SCA patients and ninety haemoglobin AA (controls were enrolled. There was no significant difference in the age of the participants with SCA and that of the controls but the body mass index was significantly higher in controls (p=0.0001. Overall, 73.1% (68 of 93 had abnormal ECG while only 2 of 90 (2.2% of controls had abnormal ECG. The common abnormalities observed were left ventricular hypertrophy, biventricular hypertrophy, and right ventricular hypertrophy. Conclusion. Patients with SCA in steady state tend to have normal heart rate but about 50% of them would have had ECG changes before the age of 20 years. ECG being a noninvasive test may be used to identify patients at risk for early intervention.

  18. Microbiological and Toxicological Assessment of Pharmaceutical Wastewater from the Lagos Megacity, Nigeria

    Directory of Open Access Journals (Sweden)

    Avemaria Ifeoma Obasi

    2014-01-01

    Full Text Available We conducted a microbiological and toxicological profiling of a pharmaceutical wastewater, one of the major wastes entering the Lagos lagoon. The morphological characterization of seven bacterial isolates from the wastewater indicated that 4 of them were gram positive bacilli while 3 were cocci of both gram reactions. The bacterial isolates exhibited varying degrees of enzyme activities but most were able to hydrolyze starch to yield amylase. Only 3 of the isolates showed prospects as antibacterial agents, given their moderate inhibition to Staphylococcus xylosus relative to 8 other species tested. Overall, 81.3% of the isolates were resistant, and 3.3% were susceptible while 15.4% of the isolates showed intermediate sensitivity to the antibiotics. The assessment of antioxidant activities in liver samples of Nile tilapia, Oreochromis niloticus, exposed to sublethal concentrations of the effluents indicated some form of oxidative stress given the higher levels of lipid peroxidation product, malondialdehyde, in the exposed fishes relative to the control kept in dechlorinate tap water. But for reduced glutathione, activities of the antioxidative stress enzymes, superoxide dismutase (SOD, catalase (CAT, and glutathione-s-transferase (GST, were higher in the effluent exposed tilapia. Responses were not dose dependent and enzyme activities were often higher at day 14 compared to day 28. This relevance of the findings to water quality was discussed.

  19. Eradication of bovine brucellosis in the 10th Region de Los Lagos, Chile.

    Science.gov (United States)

    Rivera, S Alejandro; Ramírez, M Cristina; Lopetegui, I Patricia

    2002-12-20

    The process of Bovine Brucellosis Eradication that began in 1996 in the 10th Region de Los Lagos of Chile will be reviewed. The region comprises the most important dairy area of the country and it has the largest concentration of brucellosis infected herds. Based on the information gathered by an epidemiological surveillance system, the results of the eradication process for the years 1996 till 2001 are presented as rates of Milk Ring Test (MRT) positive dairies, rates of brucellosis reactors (bovines) in livestock markets and slaughterhouses, and the annual incidence and prevalence of brucellosis infected herds. During the period the rates of positive dairies, bovine reactors in livestock markets and slaughterhouses, and the annual incidence and prevalence of infected herds have experienced a decrease, while the rate of bovine reactors in slaughterhouses has remained stable. Data on the preventive measures taken, such as vaccination of female bovines and Certification of Brucellosis Free Herds, are also shown. The surveillance system has allowed the detection of infected herds, while the measures of prevention and cleaning of infected herds have allowed a reduction in the incidence and prevalence of the infection by Brucella abortus. Copyright 2002 Elsevier Science B.V.

  20. Antimethicilin resistance agents from marine actinomycetes from soil sediments of Lagos Lagoon

    Directory of Open Access Journals (Sweden)

    Davies Olabisi Flora

    2015-03-01

    Full Text Available Objective: To evaluate the isolation of actinomycetes strains with potential for producing antimicrobials with high methicilin resistance capability. Methods: The soil samples were collected from four different locations of Lagos lagoon. The Actinomycetes were isolated from the samples by serial dilution using spread plate method. Isolates were selected based on their cultural characteristics as well as their Gram reaction and phenotypically and molecularly characterized Streptomyces sp. Isolates were inoculated in starch casein and Kuster’s broth media and secondary metabolites were screened for antimicrobial activity against the following microorganisms: methicillin resistant Staphylococcus aureus, Staphylococcus aureus ATCC 29213, Escherichia coli ATCC 29522, Pseudomonas aeruginosa ATCC 27853, Candida albicans, Enterococcus faecalis ATCC 29212. Coagulase-negative staphylococci isolated from HIV patients were also used (Staphylococcus warneri, Staphylococcus xylosus and Staphylococcus epidermidis. The antimicrobial metabolites of the isolates were identified using gas chromatography-mass spectrometer. Results: Extracts from isolates ULS12 and ULS13 showed antimicrobial activity against methicillin resistant Staphylococcus aureus while ULK3 inhibited Candida albicans only. The gas chromatography-mass spectrometer data analysis showed the antibiotic profile of these isolates. Conclusions: The isolates ULS12 and ULS13 were found to display the highest antimicrobial activity against the test organisms and could be a potential source of new antibiotics.

  1. Health care providers' knowledge of, attitudes toward and provision of emergency contraceptives in Lagos, Nigeria.

    Science.gov (United States)

    Ebuehi, Olufunke Margaret; Ebuehi, Osaretin A T; Inem, Victor

    2006-06-01

    Emergency contraception can play an important role in reducing the rate of unintended pregnancies in Nigeria. Although it is included in the national family planning guidelines, there is limited awareness of this method among clients. In 2003-2004, a sample of 256 health care providers within Lagos State were surveyed about their knowledge of, attitudes toward and provision of emergency contraceptives, using a 25-item, self-administered questionnaire. Frequencies were calculated for the various measures, and chi-square tests were used to determine significant differences. Nine in 10 providers had heard of emergency contraception, but many lacked specific knowledge about the method. Only half of them knew the correct time frame for effective use of emergency contraceptive pills, and three-fourths knew that the pills prevent pregnancy; more than a third incorrectly believed that they may act as an abortifacient. Fewer than a third of respondents who had heard of the pills knew that they are legal in Nigeria. Of those who had heard about emergency contraception, 58% had provided clients with emergency contraceptive pills, yet only 10% of these providers could correctly identify the drug, dose and timing of the first pill in the regimen. Furthermore, fewer than one in 10 of those who knew of emergency contraception said they always provided information to clients, whereas a fourth said they never did so. Nigerian health care providers urgently need education about emergency contraception; training programs should target the types of providers who are less knowledgeable about the method.

  2. Tilapia africana en el Lago de Nicaragua: ecosistema en transición.

    Directory of Open Access Journals (Sweden)

    Jeffrey K. McCrary

    1998-10-01

    Full Text Available Los grandes lagos de Nicaragua, son comparables con el sistema de grandes lagos africanos. Contienen una gran diversidad de peces, incluyendo varios peces endémicos de la familia Cichlidae. La captura de peces en el Lago de Cocibolca, estandarizada en 100 metros de red, promedió 4.34 kilogramos en el área de Ometepe, en donde la tilapia constituyó el 1.5 % del peso total de la captura. Este promedio fue de 0.80 kilogramos en la costa septentrional, donde la tilapia constituyó 54% del peso total de la captura. Un estudio ruso efectuado en 1983 y desarrollado en todo el Lago, demostró que el promedio era de 4.66 kilogramos. Los autores del presente artículo recomiendan que en el Lago Cocibolca se implemente un plan de manejo adecuado para controlar la población de tilapia y rescatar un ecosistema en peligro de colapso

  3. Oxygen consumption and responses of the freshwater snail Bulinus ...

    African Journals Online (AJOL)

    A gradient or choice apparatus, based on the 'fluvarium' principle and suitable for testing the responses of the freshwater snail Bulinus (Physopsis) globosus to different partial oxygen tensions was used. In a gradual oxygen gradient established with this apparatus, B. (P.) globosus shows a significant preference for ...

  4. Access to and Use of Reproductive Health Information among In-School Adolescent Girls in Lagos State, Nigeria

    Science.gov (United States)

    Nwalo, K. I. N.; Anasi, Stella N. I.

    2012-01-01

    Objective: This study investigated access to and use of reproductive health information among in-school adolescent girls in Lagos State, Nigeria. Design: Descriptive survey research design was adopted for the study. Setting: The study sample consisted of 1,800 girls randomly selected from 18 public senior secondary schools in Lagos State. Method:…

  5. The Lagos coast : Investigation of the long-term morphological impact of the Eko Atlantic City project

    NARCIS (Netherlands)

    van Bentum, K.M.; Hoyng, C.W.; van Ledden, M.; Luijendijk, A.P.; Stive, M.J.F.

    2012-01-01

    The Lagos coast has been suffering high rates of erosion since the construction of three harbour moles, i.e. the West Mole, East Mole and the Training Mole, at the tidal inlet connecting the Lagos Lagoon to the South Atlantic Ocean. To provide for a permanent erosion mitigation measure and to create

  6. Spinal neural tube defects in Lagos University Teaching Hospital, Nigeria.

    Science.gov (United States)

    Bankole, O B; Arigbabu, S O; Kanu, O O

    2012-01-01

    The incidence of neural tube defects is known to vary among regions. Very little has been reported about the incidence in Sub-Saharan Africa except for the general impression that the prevalent rates are low. To determine the profile of patients presenting with neural tube defects in Lagos, Nigeria We studied all patients with congenital midline back swellings presenting to one of two neurosurgical services in the state over a 5-year period to establish the incidence of spina bifida and develop demographic data. Data collected included the age at presentation, maternal age, education and parity, presence of co-existing anomalies and the social status of the parents. One hundred and eight patients with congenital midline swellings of the back were studied. Meningomyelocele accounted for 96% of the cases seen. Half the patients presented within the first two weeks of life and although fifty percent of mothers had ultrasound scans done during pregnancy none of the patients were diagnosed prenatally. Seventy-three percent of mothers of affected children were from a low socio-economic class. The commonest co-existing congenital anomaly was lower limb deformity (Talipes equino-varus). Spina bifida is the commonest indication for neurosurgical clinic referral with the exception of trauma in our environment. The prevalence is higher among women in the lower socio-economic groups. Improved perinatal care is required to ensure that children with such birth defects get prompt medical attention and thereby prevent worsening of an already complex problem.

  7. Castelvecchio and Castiglione del Lago: Two new Italian iron meteorites

    Science.gov (United States)

    Moggi Cecchi, V.; Pratesi, G.; Caporali, S.; Herd, C. D. K.; Chen, G.

    2017-08-01

    Until 2016 only 38 Italian meteorites have been classified and published on the Meteoritical Bulletin Database. Among these, only 4 were irons. We here report the results of the analyses performed on two iron meteorites recovered in Italy. The first one, Castiglione del Lago, weighing 667g, was recovered in 1970. The textural features observed by means of both optical microscope and SEM, as well as SEM-EDX and ICP-MS analyses, allowed to classify it as IAB-MG iron. The second one, named Castelvecchio, has been recovered at Lignana, near Pontito, in August 2015. In the same locality a fireball was witnessed on October 23, 1986, by Mario Goiorani, a meteorite collector. The main mass, weighing 49.5g, was recovered inside a hollow. A chip, observed with both optical metallographic microscope and SEM, displayed no kamacite lamellae at the centimetric scale, suggesting a classification as IIAB iron. This classification was confirmed by ICP-MS analyses. Both meteorites have been approved by the Meteoritical Society in 2016 and published in the on-line Meteoritical Bulletin Database (https://www.lpi.usra.edu/meteor).

  8. Mineralogical aspects of Morro de Seis Lagos deposit (Amazonas, Brazil).

    Science.gov (United States)

    Takehara, Lucy; Almeida, Marcelo; Silveira, Francisco

    2014-05-01

    The alkaline body Morro dos Seis Lagos, situated in the northwest Amazonian region, is a Nb bearing deposit formed by thick lateritic regolith as circular geological feature about 5 km in diameter. The host rock of this deposit is an intensely weathered siderite carbonatite. The alkaline intrusion body was formed during the late Mesozoic and enriched during the Cenozoic by process of denudation of the surrounding rocks and formation of lateritic cover with thickness in the order of hundreds of meters. In this process, enrichment of Nb, Fe, Ti, Mn, P and rare earth elements (REE) occurred where the lateritic regolith represents the major Nb mineralization, with estimated inferred reserves of 2.9 billion ton@ 2.8 % Nb2O5, one of the largest deposits of Nb in the world. The mineralogical composition of the lateritic regolith has the predominance of the goethite and hematite, followed by oxy - hydroxides of Mn, Ti - Nb oxides, pyrochlore, cerianite and phosphates. The lateritic regolith samples showed high contents of Fe2O3 40 %, and is followed by elevated Th concentration, which locally has concentration higher than (18%). Another REE mineral is the cerianite. The main manganese minerals are hollandite, romanechite (BaMn9O16[OH4] - mixtures of manganese oxides) and amorphous Mn oxy - hydroxides. The higher concentration of MnO2 (about 40 %) is restricted to manganesiferous range, where manganese minerals occur as layers and filling voids, indicating strong remobilization by later process.

  9. Examination of Estate Marketing Practices in Ikeja, Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Joseph Oyewale Oyedeji

    2017-09-01

    Full Text Available Estate marketing is an aspect of the profession of Estate Surveying and Valuation in Nigeria. Previous studies on estate marketing identified that there are challenges affecting estate marketing and the resultant effect on these challenges affects the credibility of the profession of Estate Surveying and Valuation in Nigeria. This necessitates the need to examine the practice of estate marketing in Nigeria. This study examined estate marketing practice among estate surveyors and valuers in Ikeja, Lagos Nigeria. The sample size for the study is the 64 registered Estate Surveying and Valuation firms in the study area. Data gathered were analyzed using descriptive statistics and 5-point likert ordinal scale. Findings from the study revealed that the use of brochure or bulletin is the most common estate marketing method in the study area. Also, it was revealed from the study that the use of press is the most cost effective method of estate marketing in the study area. The study identified the various challenges of estate marketing. However, collection of double professional fees is the most prevalent challenge of estate marketing in the study area. Finally, aggressive marketing which leads to unethical practices is the most prevalent mitigating measures adopted by Estate Surveyors and Valuers in the study area. Recommendations were made on how to review the ethical regulations guiding the practice of Estate Surveying and Valuation which will consequently improve marketing in the study area.

  10. Congenital club foot in a teaching hospital in Lagos, Nigeria.

    Science.gov (United States)

    Adewole, O A; Giwa, S O; Kayode, M O; Shoga, M O; Balogun, R A

    2009-06-01

    Congenital club foot has been sparsely reported in literature in Nigeria, although it has been reported as the commonest congenital musculoskeletal abnormality. This study enumerates the point prevalence of this disease in a university teaching hospital in Lagos. Better understanding of the epidemiology in our community should improve awareness, and influence management. Between June 2005 and July 2006, 72 consecutive patients with congenital club feet were seen in the orthopaedic clinic of our Hospital. Demographic data, birth weight, family history, birth facility, maternal age and associated congenital anomalies were recorded and analysed using Statistical Programme for Social Sciences (SPSS) version 15. A total of 72 patients were seen, 28 of whom had bilateral club feet resulting in a total of 100 feet. There were 38 males and 34 females. Only 29% presented in the first month of life and 28% in the second month. Maternal ages ranged between 19 and 38 years and no family history of congenital club foot was given,. Babies delivered outside the orthodox medical system (churches, traditional healers, home etc) constituted 28%. The commonest associated congenital anomalies were tibia hemimelia, hydrocephalus, inguinal hernia and umbilical hernia. A default rate of 28% was observed during treatment. Congenital club foot may not be uncommon in Nigeria. Late presentation and high default rate before correction of the deformity were observed. Establishment of special club foot clinics should reduce the default rate. Training of healthcare workers in maternity units as well as Public awareness should encourage early referral to specialists.

  11. Método específico para la evaluación medioambiental de los lagos de origen glaciar pirenaicos y su aplicación al lago de Sabocos

    Directory of Open Access Journals (Sweden)

    Arruebo, T.

    2009-12-01

    Full Text Available This study proposes a new method to asses the environmental state of the Pyrenean glacial lakes, based on the Water Framework Directive, the concept of ecological state and inspired by widely tested and used methodologies. Starting from a good ecological state as a reference term, a series of matrices are used to identify and characterize all anthropic impacts and pressures. Information regarding the most significant ones is then compared with the criteria of a panel of experts and finally the results are summarised in ICPA matrices of Impacts, Consequences, Proposals of Corrective Measures, and Applicability. This method has been tested in the glacial lake of Sabocos, finding that its ecological quality is lower than expected, based on the identification of some severe impacts. In order to subdue them, it has been proposed a plan of correcting measures and valued its applicability.

    En este trabajo se propone un nuevo método para la evaluación medioambiental de los lagos pirenaicos de origen glaciar a partir de la Directiva Marco del Agua, fundamentado en el concepto de estado ecológico e inspirado en metodologías ampliamente contrastadas. Partiendo de un estado ecológico de referencia se identifican y caracterizan todas las presiones e impactos antropogénicos mediante el empleo de una serie de matrices adaptadas. Los impactos más significativos son contrastados por un panel de expertos. Finalmente, los resultados se expresan mediante matrices ICPA de Impactos, Consecuencias, Propuestas de medidas correctoras y Aplicabilidad. Este método de evaluación medioambiental se ha aplicado al lago de Sabocos. Los resultados obtenidos muestran una calidad ecológica inferior a la esperada y que algunos de los impactos identificados son severos. Con el objetivo de mitigar tales afecciones, se han propuesto una serie de medidas correctoras y evaluado su aplicabilidad.

  12. 76 FR 44535 - Testing of Bisphenol A

    Science.gov (United States)

    2011-07-26

    ... freshwater and marine acute fish and aquatic invertebrate toxicity tests, and freshwater aquatic plant toxicity tests. Test results were submitted in response to the proposal for freshwater and marine acute..., amphibians, reptiles, birds, and wild mammals, and a review is provided by Crain et al. (Ref. 11). In general...

  13. Mapping saline water intrusion into the coastal aquifer with geophysical and geochemical techniques: the University of Lagos campus case (Nigeria).

    Science.gov (United States)

    Ayolabi, Elijah A; Folorunso, Adetayo F; Odukoya, Abiodun M; Adeniran, Adelere E

    2013-01-01

    Saltwater intrusion into the coastal aquifer, a phenomenon brought by the flow of seawater into freshwater aquifers originally caused by groundwater extraction near the coast, has long been recognised as a major concern around the world. In this study, we employed geophysical and geochemical techniques to map and provide evidences that the coastal aquifers in the study area have been intruded by saltwater from the adjacent Lagos lagoon. The resistivity data were acquired with an electrode spacing (a) that vary between 1.6 to 8 m, and expansion factor n of 30. The depth inverted models obtained from inversion of the fifteen resistivity data obtained in the area revealed significant impact of the lagoon water on the aquifers indicated as low resistivity usually below 7 Ωm. A combination of four different electrode arrays - Schlumberger, Wenner, Dipole-dipole and pole-dipole, with at least three deployed at each site ( except for three traverses - traverses 13, 14 and 15), yield better horizontal and vertical resolution, having depth range of 36-226 m with 1.6-8 m electrode spacing used. The delineated geoelectric layers were juxtaposed with logs from both boreholes located within the campus. Evidence from geochemical study of borehole and the lagoon water samples corroborated the ERT result. Progressive decrease in total dissolved solute (TDS) and electrical conductivity (EC) from the lagoon to the coastal aquifer buttresses gradual encroachment of the inland aquifers by the intruding lagoon water. In addition, similar trend was observed in heavy metal distribution Pollution Index (PI) plot suggesting possible underground flow of water from the lagoon to the aquifers. From this study, we deduced that excessive groundwater extraction and possibly the reduction of groundwater gradients which allows saline-water to displace fresh water in the aquifer of the investigated area are responsible for the saline water intrusion observed.

  14. Seroprevalence of Toxoplasma gondii IgG antibody in HIV-infected patients at the Lagos University Teaching Hospital

    Directory of Open Access Journals (Sweden)

    Osunkalu VO

    2011-09-01

    Full Text Available Vincent O Osunkalu1, Sulaimon A Akanmu1, Nkolika J Ofomah1, Igwebuike V Onyiaorah2, Adewumi A Adediran1, Ralph O Akinde3, Ifeanyi A Onwuezobe41Department of Haematology and Blood Transfusion, College of Medicine Idi-Araba, Lagos, Nigeria; 2Department of Histopathology, Nnamdi Azikiwe University, Nnewi Campus, Lagos, Nigeria; 3Department of Morbid Anatomy, College of Medicine Idi-Araba, Lagos, Nigeria; 4Department of Microbiology, University of Calabar, NigeriaBackground: Toxoplasmosis is caused by infection with a ubiquitous intracellular protozoan parasite, Toxoplasma gondii. With the advent of the HIV pandemic in Nigeria, toxoplasmic encephalitis has become one of the more frequent opportunistic infections and the most commonly implicated cause of focal brain lesions complicating the course of AIDS.Objectives: This study was conducted to compare the pattern of seroprevalence of T. gondii (Toxo-IgG antibodies among HIV-infected persons presenting with neurological complications and those without.Materials and methods: Plasma specimens collected from 380 subjects were tested for Toxo-IgG antibodies by enzyme immunoassay technique and CD4 estimation by flow cytometry. Close-ended questionnaires were applied to all respondents to collect relevant data, with ethical approval from the hospital ethical committee. Plasma was obtained from two study groups comprising 300 HIV-positive respondents without neurological presentations, and 80 HIV-positive respondents with neurological complications.Results: Seroprevalence of Toxo-IgG antibodies was 58% in the HIV-positive study group without neurological complications (of these, 79.2% were males and 38.5% were females and 40% in the study group with neurological complications (46.2% of these were males and 28.6% were females. The overall seroprevalence of Toxo-IgG antibodies among the HIV-positive respondents (with and without neurological complications was 54.2% (206 of 380. Seroprevalence of Toxo

  15. An appraisal of the participation of Egun women in fisheries in Otoawori of Ojo Local Government Area in Lagos State, Nigeria

    OpenAIRE

    Imoukhuede, D.O.; Joseph, F.; Udolisa, R.E.K.

    2007-01-01

    The study was carried out to identify the roles of Egun Women in Fisheries in Oto-Awori of Ojo Local Government Area of Lagos State, as well as factors affecting their roles. Data were collected using the purposive sampling to select 20 Egun Women involved in Fisheries in each of Araromi, Idumosan, lIepete, Idomila and Ebute areas in Oto-Awori, using questionnaire method. Data were analysed using the percentages and Chi-square tests. The results revealed that 80% of the Egun Women were engage...

  16. Diez años de monitoreo limnológico de un lago natural modificado en los trópicos: el lago Cote, Costa Rica

    Directory of Open Access Journals (Sweden)

    Gerardo Umaña

    2014-08-01

    Full Text Available Esta localizado a 650m sobre el nivel del mar en el límite entre las llanuras del Norte y la vertiente del Pacífico en la Cordillera de Guanacaste, Costa Rica. Al inicio de la década de 1980 se construyó una represa en el río de desagüe y el caudal de salida fue desviado hacia el Embalse Arenal. Se realizó un primer estudio entre 1990 y 1991, y luego en el año 2001 antes de que se construyera una nueva modificación del lago mediante el levantamiento del nivel de la presa en un metro con el fin de utilizar la descarga para la producción de energía hidroeléctrica. Del 2002 al 2010 se realizó un monitoreo limnológico dos veces al año. Aquí se presenta un análisis de las principales características y de los cambios a través del tiempo. El lago es polimíctico discontinuo y desarrolla una termoclina intermitente a 6m de profundidad, la cual puede perdurar por varios días o semanas a juzgar por el desarrollo de una capa anóxica cercana al fondo. Desde su modificación la temperatura superficial del lago ha alcanzado valores mayores a los reportados con anterioridad. El hipolimnion muestra periodos de hipoxia a anoxia que se han vuelto más frecuentes. A pesar de la turbidez del lago, la concentración de nutrientes y de clorofila a son bajos. La tendencia en tiempos recientes es a una reducción de la clorofila a y un aumento en la trasparencia del agua. Estos cambios son similares a los observados en lagos donde se ha logrado atribuirlos al cambio climático global. También se pueden deber a la modificación del flujo del efluente por la operación intermitente de la planta hidroeléctrica, que favorece la acumulación de calor en la columna de agua. Esto debido a que otros factores, como el cambio en el uso del suelo en los alrededores del lago ocurrieron en la década de 1980, por lo que no se les puede atribuir una influencia en los cambios observados en los últimos 10 años.

  17. The influence of male partners on contraceptive usage in sub-Saharan Africa-Lagos experience

    Directory of Open Access Journals (Sweden)

    Omololu Adegbola

    2016-01-01

    Full Text Available Background: Family planning programs, researches, and studies have focused mainly on women with little attention to men′s role in the contraceptive choices by the couple. Men′s exclusion from these programs has serious implications on the acceptance and use of contraceptives by the couple. Objective: To determine the influence of male partners on contraceptive use of their spouses. Subjects and Methods: This was a cross-sectional descriptive study at a Tertiary Care Centre in Lagos, Nigeria. It was conducted from January 1 to April 30, 2010, where all consecutive consenting pregnant women were given structured questionnaires to give to their partners so as to evaluate the contribution of the male partners to contraceptives use in their spouses as well as assess their awareness and knowledge of contraception. Categorical variables were analyzed using Chi-square test or Fisher′s exact test as appropriate while continuous variables by t-test. P < 0.05 was considered significant. Results: Of the 370 respondents, only 51.9% (192 knew about female contraceptive methods, while 50% (185 were willing to allow their wives to use contraception. Barrier method (17.3% and periodic abstinence (15.7% were the leading preferred choice for their wives. However, bilateral tubal ligation was the least preferred method (1.6%. Previous counseling of male partner significantly influenced their decision to allow their wives to use contraceptives (P = 0.001. Conclusion: Involving the male partner in family planning counseling plays an important role in increasing the acceptance and use of contraceptives by the couple.

  18. The Status of Malaria among Pregnant Women: A Study in Lagos ...

    African Journals Online (AJOL)

    Le statut du paludisme chez les femmes enceintes: une étude effectuée à Lagos, Nigéria. Nous avons mené une étude sur le statut du paludisme chez 800 femmes enceintes dans l'Etat de Lagos qui ont été selectionnées au hasard. Dés échantillons du sang ont été prélevés à travers la figure de droigt et ont été analysés ...

  19. Tamaño relativo del cerebro en murciélagos cubanos

    OpenAIRE

    Mancina, Carlos A.

    2004-01-01

    Se estudia el tamaño relativo del cerebro en 22 especies de murciélagos cubanos, incluidos en seis familias: Phyllostomidae (siete), Mormoopidae (cuatro), Natalidae (una), Noctilionidae (cuatro), Vespertilionidae (cuatro) y Molossidae (cinco). Se incluyeron todos los géneros (19) presentes en el Archipiélago cubano con la excepción de Anthrozous. El exponente alométrico que describe la relación entre el volumen endocraneal y la masa corporal es considerablemente más alto que el hallado en est...

  20. Tratamiento de los defectos del cartílago articular en la rodilla

    OpenAIRE

    Reverté Vinaixa, María Mercedes

    2015-01-01

    Las lesiones condrales y osteocondrales en la rodilla aparecen en gente joven, activa y con gran expectativa de vida. Estás suponen un gran problema, puesto que este una vez destruido, ya no se repara. Debido a la escasa capacidad intrínseca de curación del cartílago, sus lesiones tienden a causar morbilidad en forma de dolor articular y disfunción. Existen diferentes técnicas quirúrgicas que mejoran la sintomatología y la historia natural de las lesiones condrales. Las lesiones del cartílago...

  1. Cable Bacteria in Freshwater Sediments

    DEFF Research Database (Denmark)

    Risgaard-Petersen, Nils; Kristiansen, Michael; Frederiksen, Rasmus

    2015-01-01

    In marine sediments cathodic oxygen reduction at the sediment surface can be coupled to anodic sulfide oxidation in deeper anoxic layers through electrical currents mediated by filamentous, multicellular bacteria of the Desulfobulbaceae family, the so-called cable bacteria. Until now, cable...... bacteria have only been reported from marine environments. In this study, we demonstrate that cable bacteria also occur in freshwater sediments. In a first step, homogenized sediment collected from the freshwater stream Giber Å, Denmark, was incubated in the laboratory. After 2 weeks, pH signatures...... marine cable bacteria, with the genus Desulfobulbus as the closest cultured lineage. The results of the present study indicate that electric currents mediated by cable bacteria could be important for the biogeochemistry in many more environments than anticipated thus far and suggest a common evolutionary...

  2. Changing Arctic Ocean freshwater pathways.

    Science.gov (United States)

    Morison, James; Kwok, Ron; Peralta-Ferriz, Cecilia; Alkire, Matt; Rigor, Ignatius; Andersen, Roger; Steele, Mike

    2012-01-04

    Freshening in the Canada basin of the Arctic Ocean began in the 1990s and continued to at least the end of 2008. By then, the Arctic Ocean might have gained four times as much fresh water as comprised the Great Salinity Anomaly of the 1970s, raising the spectre of slowing global ocean circulation. Freshening has been attributed to increased sea ice melting and contributions from runoff, but a leading explanation has been a strengthening of the Beaufort High--a characteristic peak in sea level atmospheric pressure--which tends to accelerate an anticyclonic (clockwise) wind pattern causing convergence of fresh surface water. Limited observations have made this explanation difficult to verify, and observations of increasing freshwater content under a weakened Beaufort High suggest that other factors must be affecting freshwater content. Here we use observations to show that during a time of record reductions in ice extent from 2005 to 2008, the dominant freshwater content changes were an increase in the Canada basin balanced by a decrease in the Eurasian basin. Observations are drawn from satellite data (sea surface height and ocean-bottom pressure) and in situ data. The freshwater changes were due to a cyclonic (anticlockwise) shift in the ocean pathway of Eurasian runoff forced by strengthening of the west-to-east Northern Hemisphere atmospheric circulation characterized by an increased Arctic Oscillation index. Our results confirm that runoff is an important influence on the Arctic Ocean and establish that the spatial and temporal manifestations of the runoff pathways are modulated by the Arctic Oscillation, rather than the strength of the wind-driven Beaufort Gyre circulation.

  3. Occurrence of extended-spectrum and AmpC β-lactamases in multiple drug resistant Salmonella isolates from clinical samples in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Akinyemi KO

    2017-01-01

    Full Text Available KO Akinyemi,1 Bamidele Abiodun Iwalokun,2 Akeeb O Bola Oyefolu,1 CO Fakorede1 1Department of Microbiology, Lagos State University, Ojo, 2Molecular Biology and Biotechnology Division, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria Purpose: Salmonella spp. are important foodborne pathogens exhibiting increasing resistance to antimicrobial drugs. Resistance to broad-spectrum β-lactams, mediated by extended-spectrum β-lactamase (ESBL and AmpC β-lactamase enzymes is fast spreading and has had negative impacts on the clinical outcomes, particularly on third-generation cephalosporins. This study investigated the carriage of AmpC gene among multidrug-resistant Salmonella spp. from Lagos, Nigeria. Methods: Forty Salmonella spp. from clinical samples (S. typhi = 13; S. typhimurium = 10; S. enteritidis = 8; S. choleraesuis = 5; S. paratyphi = 4 were subjected to in vitro susceptibility test by disk diffusion methods. Isolates that were resistant to cefoxitin and third-generation cephalosporins were screened for ESBL (Double Disk Synergy Test Method and AmpC enzyme (AmpC disk test production. Detection of AmpC fox gene was carried out by polymerase chain reaction. Results: Thirty-two (80% of the Salmonella isolates were cefoxitin resistant. Plasmid-mediated AmpC β-lactamase and ESBL enzymes were recorded in 10/40 (25% and 16/40 (40% of the Salmonella isolates, respectively. Specifically, 16/40 (40% of the Salmonella isolates possessed 380 bp AmpC fox gene, with the highest occurrence found in S. typhi strains (43.8% followed by S. typhimurium (25%. There was no AmpC fox gene detected in S. paratyphi strains. Interestingly, coproduction of enzymes occurred in some of the isolates, raising fears of resistance to a multitude of antibiotics in the treatment of bacterial infections. Conclusion: Emergence of AmpC β-lactamase–producing Salmonella isolates in our environment was recorded for the first time, raising concern on increased

  4. Fixed drug eruption at a dermatology clinic in Lagos, Nigeria

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    Olusola Olabisi Ayanlowo

    2015-01-01

    Full Text Available Background: Fixed drug eruption (FDE is common cutaneous drug eruption characterized by the development of one or more annular, oval, erythematous, and hyperpigmented patches as a result of systemic exposure to a drug. Drugs causing FDE vary with prevailing diseases and prescription pattern in different parts of the world. This study is aimed at reviewing cases of FDE seen at the dermatology outpatient clinic of Lagos University Teaching Hospital (LUTH over a 9-year period, highlighting the spectrum of drugs implicated and the clinical characteristics. Materials and Methods: Data were obtained from the clinic records and patients' case notes. These included the demographic details, duration of presentation, drugs implicated, and clinical characteristics. Results: FDE was diagnosed in 1.8% (295/16,160 of patients seen. There was a slight female preponderance. Antimalarials were the commonest group of medications implicated (51.0% followed by antibiotics (27.9%; analgesics (10.2%, herbal toothpaste (6.1%, and oral hypoglycemic agents (4.1%. Sulfonamides were the commonest group of drugs found in 78 patients (53.1% predominantly as sulfadoxine/pyrimethamine antimalarials and trimethoprim/sulfamethoxazole antibiotics (co-trimoxazole. Conclusion: Concerted efforts are needed to discourage over-the-counter sales and purchase of nonprescription sulfonamide-based medications. A change in prescription pattern from sulfonamides to other classes of antimalarials and antibiotics is desirable and/or recommended. Patients should inform their caregivers at any point of care about their reaction to drugs. It is advised that they have a list of common implicating drugs and they wear a medic alert or carry an ID card bearing this information.

  5. Self-medication for infants with colic in Lagos, Nigeria.

    Science.gov (United States)

    Oshikoya, Kazeem A; Senbanjo, Idowu O; Njokanma, Olisamedua F

    2009-02-04

    Infantile colic is a self-limiting condition that is distributed worldwide. It is often misdiagnosed as an organic disease for which an infant is admitted to the hospital. Many studies have described the aetiopathogenesis, pharmacologic and non-pharmacologic management of colic but none has evaluated self-medication for infants with colic. The aim of this study was therefore to determine the knowledge of Nigerian mothers about colic, their home-based management, extent of self-medication for the infants with colic and the types of medicines involved. It is a prospective study conducted at the vaccination clinics of 20 primary health care centres, each from different Local Government Areas in Lagos, Nigeria. Eight hundred mothers that brought their infants for vaccination between April and September, 2006 were interviewed with open-and close-ended questionnaire. Six hundred and eighty three (85.4%) mothers claimed they had a good knowledge of colic. Incessant and excessive cry was the main clinical feature of colic identified by 430(62.9%) mothers. Three hundred and seventy eight (67.7%) infants were treated by self-medication, 157 (28.1%) sought medical intervention and 17 (3.1%) were treated at a traditional birth attendant home. Herbal medicines constituted 51.8% of the self-medicated medicines, of which 48 (26.2%) were "Ororo Ogiri". Nospamin (49.5%) and Gripe water (43.0%) were the two frequently prescribed and self-medicated medicines for infants with colic. Nigerian mothers are deficient in their knowledge of colic. Self-medication was the most frequently used home-based intervention. Health education would appear necessary to improve parental management of this self-limiting condition.

  6. Self-medication for infants with colic in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Oshikoya Kazeem A

    2009-02-01

    Full Text Available Abstract Background Infantile colic is a self-limiting condition that is distributed worldwide. It is often misdiagnosed as an organic disease for which an infant is admitted to the hospital. Many studies have described the aetiopathogenesis, pharmacologic and non-pharmacologic management of colic but none has evaluated self-medication for infants with colic. The aim of this study was therefore to determine the knowledge of Nigerian mothers about colic, their home-based management, extent of self-medication for the infants with colic and the types of medicines involved. Methods It is a prospective study conducted at the vaccination clinics of 20 primary health care centres, each from different Local Government Areas in Lagos, Nigeria. Eight hundred mothers that brought their infants for vaccination between April and September, 2006 were interviewed with open-and close-ended questionnaire. Results Six hundred and eighty three (85.4% mothers claimed they had a good knowledge of colic. Incessant and excessive cry was the main clinical feature of colic identified by 430(62.9% mothers. Three hundred and seventy eight (67.7% infants were treated by self-medication, 157 (28.1% sought medical intervention and 17 (3.1% were treated at a traditional birth attendant home. Herbal medicines constituted 51.8% of the self-medicated medicines, of which 48 (26.2% were "Ororo Ogiri". Nospamin® (49.5% and Gripe water® (43.0% were the two frequently prescribed and self-medicated medicines for infants with colic. Conclusion Nigerian mothers are deficient in their knowledge of colic. Self-medication was the most frequently used home-based intervention. Health education would appear necessary to improve parental management of this self-limiting condition.

  7. Herbal medicine use among urban residents in Lagos, Nigeria

    Science.gov (United States)

    2011-01-01

    Background Over three-quarter of the world's population is using herbal medicines with an increasing trend globally. Herbal medicines may be beneficial but are not completely harmless. This study aimed to assess the extent of use and the general knowledge of the benefits and safety of herbal medicines among urban residents in Lagos, Nigeria. Methods The study involved 388 participants recruited by cluster and random sampling techniques. Participants were interviewed with a structured open- and close-ended questionnaire. The information obtained comprises the demography and types of herbal medicines used by the respondents; indications for their use; the sources, benefits and adverse effects of the herbal medicines they used. Results A total of 12 herbal medicines (crude or refined) were used by the respondents, either alone or in combination with other herbal medicines. Herbal medicines were reportedly used by 259 (66.8%) respondents. 'Agbo jedi-jedi' (35%) was the most frequently used herbal medicine preparation, followed by 'agbo-iba' (27.5%) and Oroki herbal mixture® (9%). Family and friends had a marked influence on 78.4% of the respondents who used herbal medicine preparations. Herbal medicines were considered safe by half of the respondents despite 20.8% of those who experienced mild to moderate adverse effects. Conclusions Herbal medicine is popular among the respondents but they appear to be ignorant of its potential toxicities. It may be necessary to evaluate the safety, efficacy and quality of herbal medicines and their products through randomised clinical trial studies. Public enlightenment programme about safe use of herbal medicines may be necessary as a means of minimizing the potential adverse effects. PMID:22117933

  8. Female reproductive tract infections: understandings and care seeking behaviour among women of reproductive age in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Akinlusi Fatimat M

    2010-03-01

    Full Text Available Abstract Background Reproductive tract infections (RTI's are endemic in developing countries and entail a heavy toll on women. If untreated, RTI's can lead to adverse health outcomes such as infertility, ectopic pregnancy and increased vulnerability to transmission of the human immunodeficiency virus. It is also associated with adverse pregnancy outcomes. While RTI's and its sequelae abound in Nigeria, there is paucity of publications on the subject in the country. This study assessed the understandings and care seeking behavior with regards to RTI's among women of reproductive age in Lagos, Nigeria with the aim of improving awareness on the subject. Methods A descriptive cross sectional survey of women attending the gynaecological outpatient and family planning clinics of the Lagos State University Teaching Hospital was carried out between 1st June 2008 and 31st August 2008 using a pre-tested questionnaire. Data was analysed using the Epi-Info 3.5 statistical software of the Centre for Disease Control and Prevention, Atlanta U.S.A. Results Most of the respondents (77.2% had heard of RTI's. Toilet was the most perceived mode of contracting RTI's (44.6%, followed by sexual intercourse and poor hygiene. Vaginal discharge was the commonest symptom of RTI's named while inability to get pregnant was the commonest named complication. Majority of the respondent's demonstrated poor overall knowledge of symptoms and complications of RTI"s. 37.4% of the respondents had experienced symptoms of RTI's in the preceding six months. Vaginal discharge was the commonest symptom reported (21.8% and the majority of those who reported symptoms sought medical treatment. Government health centres were the most visited health facilities for treatment. Conclusion Even though most of the respondents have heard of RTI's and sought treatment when symptomatic, they demonstrated poor overall understanding of the subject. There is need to educate women on preventive

  9. The Freshwater Information Platform - an online network supporting freshwater biodiversity research and policy

    Science.gov (United States)

    Schmidt-Kloiber, Astrid; De Wever, Aaike; Bremerich, Vanessa; Strackbein, Jörg; Hering, Daniel; Jähnig, Sonja; Kiesel, Jens; Martens, Koen; Tockner, Klement

    2017-04-01

    Species distribution data is crucial for improving our understanding of biodiversity and its threats. This is especially the case for freshwater environments, which are heavily affected by the global biodiversity crisis. Currently, a huge body of freshwater biodiversity data is often difficult to access, because systematic data publishing practices have not yet been adopted by the freshwater research community. The Freshwater Information Platform (FIP; www.freshwaterplatform.eu) - initiated through the BioFresh project - aims at pooling freshwater related research information from a variety of projects and initiatives to make it easily accessible for scientists, water managers and conservationists as well as the interested public. It consists of several major components, three of which we want to specifically address: (1) The Freshwater Biodiversity Data Portal aims at mobilising freshwater biodiversity data, making them online available Datasets in the portal are described and documented in the (2) Freshwater Metadatabase and published as open access articles in the Freshwater Metadata Journal. The use of collected datasets for large-scale analyses and models is demonstrated in the (3) Global Freshwater Biodiversity Atlas that publishes interactive online maps featuring research results on freshwater biodiversity, resources, threats and conservation priorities. Here we present the main components of the FIP as tools to streamline open access freshwater data publication arguing this will improve the capacity to protect and manage freshwater biodiversity in the face of global change.

  10. Anthropometry of children with cerebral palsy at the Lagos University Teaching Hospital

    Directory of Open Access Journals (Sweden)

    Titilayo Olubunmi Adekoje

    2016-01-01

    Full Text Available Background: Cerebral palsy (CP is one the most common causes of disability among children in developing countries and is often associated with poor growth. The assessment of growth and nutrition of children is an important aspect of health monitoring and is one of the determinants of child survival. Aim: To assess the nutritional status of children with CP as seen in Lagos University Teaching Hospital (LUTH. Subjects and Methods: A prospective case-control study was conducted on children with CP attending the weekly pediatric neurology clinic of the LUTH between April 2005 and March 2006. Controls were apparently healthy children being followed up at the children′s out-patient clinic of LUTH for acute illness that had resolved. Anthropometric measurements of weight, length/height, mid-upper arm circumference, and skinfold thickness were taken according to the protocols recommended by the International Society of the Advancement of Kinanthropometry. Statistical Analysis: EPI-INFO (version 6.04 was used for analysis. Chi-square test was used to determine associations. Student′s t-test was used to compare means of patients and matched controls. Probability P < 0.05 were taken as statistically significant. Results: The controls had higher weight than the patients with mean weight (standard deviation of 13.7 (4.8 kg, and 12.0 (4.5 kg, respectively (P = 0.01. There were also statistically significant differences in the subscapular and biceps skinfold measurements between the patient and control groups (P = 0.00004 and 0.000008, respectively. Twenty-four (25.8% and 5 (5.4% of the patients had moderate and severe undernutrition compared to 6 (6.1% and none, respectively, in the control group (P = 0.00005. Conclusion: Children with CP had significantly lower mean anthropometric parameters and were more malnourished compared with the control group of children matched for age, sex, and social class.

  11. The depositional records of two coastal lakes in south-central Chile (Lago Lanalhue and Lago Lleu Lleu, 38°S): Active forearc tectonics and climate variability

    Science.gov (United States)

    Echtler, H. P.; Stefer, S.; Moernaut, J.; Melnick, D.; Arz, H. W.; Lamy, F.; Haug, G. H.

    2008-12-01

    On millennial time scales, the southern Chilean active margin is not only characterized by active tectonics and subduction-related coastal deformation, but also influenced by pronounced variations in the prevailing climate conditions. Here we focus on the depositional records of two coastal lakes in the southern part of the Arauco Peninsula (38°S, Lago Lanalhue and Lago Lleu Lleu), an area very sensitive to changes in both climate and tectonics. For the present study, we used a multi-proxy approach including seismic reflection surveys, sedimentological, mineralogical, and geochemical analyses, supported by radiocarbon dating. Seismic reflection analyses reveal that Lago Lanalhue and Lago Lleu Lleu developed within former river valleys that once drained into the Pacific Ocean. During the early Holocene, the ancient rivers were dammed by rising sills due to inverse faulting and tectonic uplift, turning first into marginal-marine lagoonal systems and subsequently evolving into lakes. On the basis of sedimentological analyses and radiocarbon dating, the different stages of the lakes development have been reconstructed in consideration of the regional tectonic and climatic history. The comparison of the transitions between different stratigraphic units with contemporaneous variations in the global sea level, allowed the calculation of Holocene uplift rates. These are about twenty times higher for the upraised sills than for the lakes themselves. Therefor, we interpret the sills to be the surface expression of a blind thrust associated with a prominent inverse fault (Morguilla Fault) controlling uplift and folding of the Arauco Peninsula. Geochemical data from the lacustrine part of the sedimentary sequences reveal a continuous record of the middle to late Holocene regional climate history. The results indicate more arid conditions during the middle Holocene and more humid conditions during the late Holocene. An additional increase in climate variability is recorded

  12. Work-Life Balance among academic staff of the University of Lagos ...

    African Journals Online (AJOL)

    Work-life balance is associated with the maintenance of stability in both one's professional and personal life. It is key to the welfare and, subsequently, job satisfaction and productivity of employees. It is against this understanding that this study surveyed the way academic staff of the University of Lagos perceive and pursue ...

  13. Assessment of Day Caring Methods among Civil Servant Mothers of Reproductive Age in Lagos State Nigeria

    Science.gov (United States)

    Akinnubi, Caroline Funmbi

    2016-01-01

    This study examined the day caring methods among the civil servants of reproductive age with children between three months to four years in Lagos State Nigeria. The research design employed for this study was a descriptive research design. A total number of 212 teachers and 128 ministry workers making a total of 340 reproductive age mothers were…

  14. Influence of Early Instruction on Reading Skills of Students in Lagos ...

    African Journals Online (AJOL)

    This study examined the influence of early instruction on the reading skills of students in primary schools. The sample for the study consist of 120 pupils, 57 males and 63 females randomly selected from six private and public primary schools in Lagos State. The instrument for the study was the respondents' Text Books on ...

  15. A Case Study in Distance Learning Systems: The University of Lagos Correspondence and Open Studies Unit.

    Science.gov (United States)

    Harry, Keith

    A case study of the correspondence and open studies unit of the University of Lagos, an Open University school, is presented. Areas of discussion include characteristics of the country, the educational system in Nigeria, and the correspondence and open studies unit. Specific topics include: the physical setting of Nigeria; the population; the…

  16. Coastal Dump Sites in the Lagos lagoon and toxicity of their ...

    African Journals Online (AJOL)

    The findings from this study indicate widespread and unregulated practice of coastal solid waste dumping with potential effects on water quality and biota. The need for improved waste ... the City of Lagos was discussed. Keywords: Aquatic Pollution; Waste Management; Environmental Policy; Solid Waste; Waste Recycling ...

  17. An Examination of Tenure Security for Urban Crop Farming in Lagos ...

    African Journals Online (AJOL)

    The study examined issues surrounding tenure security of land for urban crop farming and identified constraints that must be dealt with in order to facilitate land accessibility and productivity of urban crop farmers in the Lagos metropolis. 475 respondents of seven communities were selected through simple random sampling ...

  18. Transnational business and family strategies among Chinese/Nigerian couples in Guangzhou and Lagos

    NARCIS (Netherlands)

    Lan, S.

    2015-01-01

    Based on ethnographic fieldwork in Guangzhou and Lagos, this paper explores transnational trade activities and family strategies among Chinese/Nigerian interracial couples in the context of growing China/Africa trade relations and the recent tightening of China's immigration control. It examines how

  19. Detection of Influenza A Virus in Pigs in Lagos, Nigeria | Anjorin ...

    African Journals Online (AJOL)

    This study detected and subtyped strains of influenza virus from pigs in Lagos, South-western Nigeria. A total of 116 (58 nasal and 58 throat) samples from healthy pigs were analysed from two different sites in Ayedoto farm at Ojo Local Government between June and September, 2010 using reverse transcription ...

  20. Maternal and perinatal mortality in ward a, ikosi-isheri lcda in lagos ...

    African Journals Online (AJOL)

    Background: The problem of authentic statistics on maternal and peri-natal mortality has persisted in Nigeria probably because of inadequate involvement of community members in data management. Objective: The objective of this study was to improve the accuracy of information on pregnancy outcome in a ward in Lagos ...

  1. Selenium deficiency and pregnancy outcome in pregnant women with HIV in Lagos, Nigeria.

    Science.gov (United States)

    Okunade, Kehinde S; Olowoselu, Olusola F; Osanyin, Gbemisola E; John-Olabode, Sarah; Akanmu, Sulaimon A; Anorlu, Rose I

    2018-04-16

    To investigate the prevalence of maternal selenium deficiency and its effects on pregnancy outcomes in pregnant women with HIV in Lagos, Nigeria. The present descriptive cross-sectional study enrolled women aged 15-49 years with HIV who were at 14-26 weeks of a singleton pregnancy and were attending Lagos University Teaching Hospital, Lagos, Nigeria, between August 1, 2016, and April 30, 2017. Participants were selected by consecutive sampling and baseline data were collected through interviews. Venous blood samples were obtained to measure selenium concentrations, and associations between low maternal selenium concentrations (defined as <0.89 μmol/L) and pregnancy outcomes were examined using bivariate and multivariate analysis. The final analysis included 113 patients; selenium deficiency was recorded in 23 (20.4%) patients. Women with selenium deficiency had an approximately eight-fold higher risk of preterm delivery (adjusted odds ratio 7.61, 95% confidence interval 4.37-18.89; P=0.031) and of delivering a term neonate with a low delivery weight (adjusted odds ratio 8.11, 95% confidence interval 3.27-17.22; P=0.012), compared with women with a normal selenium concentration. The prevalence of selenium deficiency among pregnant women with HIV in Lagos was relatively high. The significant associations observed between maternal selenium deficiency and adverse pregnancy outcomes could have implications for the future management of HIV in pregnancy. © 2018 International Federation of Gynecology and Obstetrics.

  2. Uses and misuse of blood transfusion in Obstetrics in Lagos, Nigeria ...

    African Journals Online (AJOL)

    universitaire de Lagos entre la période du premier novembre 1995 et le 31 octobre 1998 été examinés rétrospectivement. Les données collectionnées comprend état de la cellule poste transfusion (PCV), et états d'obstétriques et médicaux ...

  3. El ultrasonido: desde el murciélago hasta la cardiología no invasiva

    Directory of Open Access Journals (Sweden)

    Fabián Dávila

    2017-03-01

    Conclusiones: Grandes avances se han logrado en consecuencia con la evolución del ultrasonido en medicina, su inicio en la ecolocalización descrita en los murciélagos hasta la ultrasonografía cardiaca en 3 D, han permitido el desarrollo de nuevas no invasivas en la medicina cardiovascular.

  4. Heavy metals in some termite species and their nests in Ojo, Lagos ...

    African Journals Online (AJOL)

    Termites feed on decaying organic matter including plant parts and wood, concentrating heavy metals in the process. The main campus of Lagos State University was surveyed for termite species and their heavy metal contents. Nests including mounds, wooden structures and discarded wood products were observed for ...

  5. PMN-Portuguese Meteor Network and OLA-Observatório do Lago Alqueva agreement

    Science.gov (United States)

    Saraiva, C.

    2018-01-01

    The PMN-Portuguese Meteor Network has two new video meteor detecting systems at OLA- Observartório do Lago Alqueva, situated at the South East Portuguese territory with a pristine night sky and more than 290 clear nights each year.

  6. Drug use indicators at a secondary health care facility in Lagos ...

    African Journals Online (AJOL)

    Objective: Drug-use indicators were measured in a secondary health care facility in Lagos, Nigeria. Method: Retrospective prescribing data was used and patient records were selected using a systematic sampling method. Results:The average number of drugs per patient was 3.5=1= 1.4, 14% of patients received at least ...

  7. Seccional del Lago Lleu Lleu extracto del resumen ejecutivo del estudio

    Directory of Open Access Journals (Sweden)

    Manuel Durán

    2000-08-01

    Full Text Available En el siguiente reportaje se presentan los estudios contratados por el MINVU Planes Seccionales del Lago Lleu Lleu y del Lago Pangue; realizados por las oficinas de Manuel Durán y Lira y Peña Asoc. A continuación entrevistamos al Sr. Tito Rojas, ex Director Regional de SERNATUR y actual Gobernador de la Provincia de Arauco, y a Patricio Aguirre, Director de la Carrera de Turismo del DUOC-UC sede Concepción. Mientras que los instrumentos de planificación desarrollan estrategias específicas para potenciar el turismo aprovechando las potencialidades del recurso lacustre; los entrevistados nos dan su opinión en cuanto a diversos aspectos relacionados con el turismo y los lagos de esta zona: el delicado equilibrio entre turismo y protección de los recursos; las potencialidades de las áreas aledañas a los lagos Pangue y Lleu Lleu; el patrimonio paisajístico y cultural de la provincia de Arauco, entre otros, son los aspectos que se exponen en las próximas páginas.

  8. Gene frequencies of ABO and Rh(D) blood group alleles in Lagos ...

    African Journals Online (AJOL)

    Subjects and methods: This study investigated the gene frequencies for the ABO and Rh(D) alleles in a population consisting of different ages in Lagos, Nigeria, over a period spanning 12 years (1998–2009). The 23,832 and 23,764 individuals were typed for ABO and Rh blood groups, respectively. We analyzed the ...

  9. The Succession Dispute to the Throne of Lagos and the British ...

    African Journals Online (AJOL)

    info

    wives of Ologun Kutere, Adele being the son of a woman of Badagry, while Osinlokun' s mother was from Ebute Iga in Ijebu, and Akitoye's mother was a woman of Owu. (Law) Local and foreign accounts hold that ...... Little wonder Ade Ajayi commented as such, “the anxiety of Britain to intervene in. Lagos was not just the ...

  10. Exploitation of Factory Workers: A Study of Union Dicon Salt, Lagos ...

    African Journals Online (AJOL)

    The study examined labour exploitation in Nigeria with particular reference to Union Dicon Salt Plc., Lagos. The review of literature points to the fact that exploitation of the factory workers in the long run leads to strained relationships between management and staff. The situation becomes conflictual to the extent that both ...

  11. Hedonic price analysis of sheep and goat market in Lagos State ...

    African Journals Online (AJOL)

    Nigeria has substantial livestock resources but problems of infrastructure limit the trade in and the profit from the trade. This study, using the hedonic price methodology, examined the factors that influence the prices of livestock in the major livestock market in Lagos State, Nigeria's most populous urban centre. The results ...

  12. Within salvation: girl hawkers and the colonial state in development era Lagos.

    Science.gov (United States)

    George, Abosede

    2011-01-01

    For almost two decades between the close of the Second World War and Nigerian independence in 1960, the British colonial state which faced a crisis of legitimacy in Lagos upheld city ordinances that made itinerant trading by young children in Lagos a punishable status offense. Although anti-trading regulations were gender-neutral in their language, girls were disproportionately sanctioned for engaging in street trading and related activities. In defending their concentration on girl sellers over boy sellers, colonial welfare officials painted a picture of the urban context as an inherently dangerous context and of girls as being particularly at risk of violent assault in the city, making them particularly in need of protection from town life. Sources which show that parents generally resisted or ignored the street trading regulations and continued permitting their daughters to sell despite entreaties, warnings, or fines from colonial officials, suggest that African parents and British colonial officials may have had conflicting views on the inherent danger of the city, on what constituted child endangerment, and on the gendered nature of childhood. This article argues that the girl saving campaigns of development era Lagos were as much about the legitimization of a colonial state facing a crisis of legitimacy as they were about debates between African parents and colonial welfare officials in Lagos concerning ideas of children and childhood and the dangers of street trading by African girls.

  13. A Ten-Year Review of Childhood Renal Admissions into the Lagos ...

    African Journals Online (AJOL)

    A Ten-Year Review of Childhood Renal Admissions into the Lagos University Teaching Hospital, Nigeria. ... Wilms Tumor (15.3%), acute renal failure (7.4%), urinary tract infection (4.9%), posterior urethral valves 3.4%), and chronic renal failure (0.5%) in order of ranking. Mortality was 17.7% and deaths were mainly from ...

  14. HIV/AIDS Awareness of Male Prison Inmates in Lagos, Nigeria ...

    African Journals Online (AJOL)

    The prevalence of HIV/AIDS is still a major challenge to the human race and this does not preclude prison inmates. This study was therefore designed to investigate the level of HIV/AIDS awareness of male prison inmates in Lagos, South west, Nigeria. The descriptive research design was adopted. The sample for the study ...

  15. The Influence of Travel Time on Accessibility in Lagos Island | Atubi ...

    African Journals Online (AJOL)

    The aim of this paper is to establish the influence of time on accessibility in Lagos Island, Nigeria. It was observed that generally, average driving speed was observed to be lower over short than over long distance routes. High speeds tend to be concentrated within a distance band of over 2.7km but beyond 6.0km average ...

  16. The Impact of the Lagos Press in Nigeria, 1861 – 1922 ...

    African Journals Online (AJOL)

    March, 1921, with the professionalism introduced by Ernest Sisei Ikoli, the first Nigerian newspaper editor. The first and second periods above between 1859 and 1921 formed the Lagos Press that held the south-western forth for sixty years with its influence extending to 1922. Since politics enjoyed great prominence in their ...

  17. Investigation into ivory trade in selected markets and hotels in Lagos ...

    African Journals Online (AJOL)

    The market growth for wildlife trophy collection is gradually leading to a decline in animal population. Thus, trade in ivory constitutes a potential threat to biodiversity conservation. The extent of this treat was therefore investigated via a 3-month survey of trade in ivory in selected markets and hotels in Lagos, Nigeria.

  18. Perceptions and Concerns about Inclusive Education among Students with Visual Impairments in Lagos, Nigeria

    Science.gov (United States)

    Brydges, Colton; Mkandawire, Paul

    2017-01-01

    This article examines the perceptions of inclusive education in Lagos, Nigeria, based upon in-depth interviews conducted with students with visual impairments during the month of July 2013. The results and discussions are situated within critical disability theory. Despite decades of inclusive education policies, the findings of the study show…

  19. Long stay patients in a psychiatric hospital in Lagos, Nigeria | Taiwo ...

    African Journals Online (AJOL)

    Objective: In the face of recently introduced government health reform and the dwindling number of available beds for acutely ill patients, a cross sectional study was carried out on long-stay patients at the 100 years old psychiatric hospital Yaba, Lagos, Nigeria with a view to discharging most of them. Method: Necessary ...

  20. Thirty-Day Case Fatality of Stroke at the Lagos University Teaching ...

    African Journals Online (AJOL)

    Background: There is some evidence that the case fatality rate of stroke has declined in recent years, although it is not certain that this reduction has been caused by changes in stroke management. There has been no recent review of the case fatality rate of stroke at the Lagos University Teaching Hospital [LUTH].

  1. Reparación del cartílago articular con injerto libre de pericondrio estudio experimental

    OpenAIRE

    Ballesteros Vazquez, P.; Carranza Bencano, Andrés; Armas Padrón, J. R.; Saenz López de Rueda, F.

    1994-01-01

    Ante la incapacidad de regeneración espontánea de lesiones profundas y amplias del cartílago articular, estudiamos la reparación cartilaginosa con plastias de pericondrio tomadas de la región condro-costal e implantándolas con su cara condrogénica sobre una lesión osteocondral realizada en la superficie articular rotuliana. Macroscópica e histológicamente, a la octava semana, el neocartílago formado tenía igual apariencia que el cartílago hialino normal, no existiendo separació...

  2. Effect of consumer behaviour and perception on car purchase decision: Empirical Evidence from Lagos - Nigeria

    Directory of Open Access Journals (Sweden)

    Ph. D. Samuel Taiwo Akinyele

    2012-05-01

    Full Text Available In recent days Nigeria is witnessing a change in consumerism. The market is now predominantly consumer driven. The focus is shifting for product based marketing to need based marketing. Consumer is given many options to decide. Passenger car segment is no exception to this general trend. An effective market communication is imperative for reaching the target audience. So it is important that we study the consumer perceptions and behaviour of the car owners which will give us feedback on how marketing strategies can be worked. Victoria Island in Lagos State, which is in the Southern part of Nigeria, has a progressive and growing market for cars. This area was selected for this study.Pre-testing was done by an interview schedule which was developed and administered to a convenient sample of twenty five car owners. A simple random sampling technique was adopted in the study to select the sample respondents. As the size of the universe is restricted, the study has been conducted on the respondents who are the owners of all the segments of passenger cars. A total of 350 interview schedules were prepared and out of this, only 327 interview schedules were filled up and collected. Data were collected through an interview schedule regarding reception of the respondents on the usage of cars. The following tools were used in testing the hypotheses and in the analysis of data. Descriptive statistical tools such as percentage, mean, median and standard deviation have been used to describe the profiles of consumers, preferred product attributes and level of satisfaction. ANOVA, T- Test and F- test have been used to test the significant differences between the groups of respondents in their perception and satisfaction for selected independent variable like age, sex and income. Chi-square test has been used to test the association between the consumer demographic characteristics and preferred product attributes and satisfaction. Multiple regression analysis has

  3. A clinicopathological study of dyspeptic subjects in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Ladi Hameed

    2012-05-01

    Full Text Available The clinicopathological and endoscopic features of dyspepsia have not been well studied in Nigeria due to the high cost of gastroscopes and lack of the relevant expertise. This study was designed to highlight these features and possible risk factors. This prospective study was conducted on adult dyspeptic patients who fulfilled the study criteria from November 2007 to December 2008 at a University hospital in Lagos, Nigeria. Demographic and clinical presentation including possible risk factors were obtained through a questionnaire administered by an interviewer followed by an upper gastrointestinal endoscopy and gastric biopsy. Of the 123 subjects who took part in the study, 100 gave their consent to an upper gastrointestinal endoscopy and biopsy. The male:female ratio was 1:1, mean age was 44.98 (SD 15.4 years and the modal age group was 38-47years. The prevalence of dyspepsia was 29% and epigastric pain was the most common presentation. Endoscopic findings were superficial mucosal lesion (21%, peptic ulcer (16%, features of gastroesophageal reflux disease (10%, and gastric cancer (2%, as well normal findings (44%. Non-steroidal antiinflammatory drug (NSAID use as a risk factor had a significant association with positive endoscopic findings; relative risk for development of positive endoscopic findings was 1.5% (P =0.03. Histology showed rates of chronic gastritis to be 91% and normal values 9%. The most common type of gastritis was the non-specific form (59.3%, followed by H. Pylori-associated gastritis (36.3%. The topography of gastritis was mainly pangastritis (68.1% and antral predominant in 23.1%. The prevalence of H. pylori by histology was 41%. The presence of H. pylori was not associated with severity, location or duration of symptoms. H. pylori was, however, found to be a significant contributor to the development of positive endoscopic findings (P=0.01; OR 2.92 95% CI 1.50-3.17. Alarm symptoms were found to be important markers of

  4. Tentacle structure in freshwater bryozoans.

    Science.gov (United States)

    Tamberg, Yuta; Shunatova, Natalia

    2017-05-01

    Tentacles are the main food-gathering organs of bryozoans. The most common design is a hollow tube of extracellular matrix (ECM), covered with ten columns of epithelial cells on the outside, and a coelothelium on the inside. Nerves follow the ECM, going between the bases of some epidermal cells. The tentacle musculature includes two bundles formed by myoepithelial cells of the coelothelium. The tentacles of freshwater (phylactolaemate) bryozoans, however, differ somewhat in structure from those of marine bryozoans. Here, we describe the tentacles of three species of phylactolaemates, comparing them to gymnolaemates and stenolaemates. Phylactolaemate tentacles tend to be longer, and with more voluminous coeloms. The composition of the frontal cell row and the number of frontal nerves is variable in freshwater bryozoans, but constant in marine groups. Abfrontal cells form a continuous row in Phylactolaemata, but occur intermittently in other two classes. Phylactolaemata lack the microvillar cuticle reported in Gymnolaemata. Abfrontal sensory tufts are always composed of pairs of mono- and/or biciliated cells. This arrangement differs from individual abfrontal ciliary cells of other bryozoans: monociliated in Stenolaemata and monociliated and multiciliated ones in Gymnolaemata. In all three groups, however, ciliated abfrontal cells probably serve as mechanoreceptors. We confirm previously described phylactolemate traits: an unusual arrangement of two-layered coelothelium lining the lateral sides of the tentacle and oral slits in the intertentacular membrane. As previously reported, tentacle movements involved in feeding differ between bryozoan groups, with phylactolaemates tending to have slower movements than both gymnolaemates and stenolaemates, and a narrower behavioral repertoire than gymnolaemates. The morphological and ultrastructural differences between the freshwater species we studied and marine bryozoans may be related to these functional differences. Muscle

  5. Evaluation of rare earth elements in groundwater of Lagos and Ogun States, Southwest Nigeria.

    Science.gov (United States)

    Ayedun, H; Arowolo, T A; Gbadebo, A M; Idowu, O A

    2017-06-01

    Rare earth elements in our environment are becoming important because of their utilization in permanent magnets, lamp phosphors, superconductors, rechargeable batteries, catalyst, ceramics and other applications. This study was conducted to evaluate the level of rare earth elements (REE) and the variability of their anomalous behavior in groundwater samples collected from Lagos and Ogun States, Southwest, Nigeria. REE concentrations were determined in 170 groundwater samples using inductively coupled plasma-mass spectrometry, while the physicochemical parameters were determined using standard methods. Lagos State groundwater is enriched with REE [sum REEs range (mean ± SD)]; [0.365-488 (69.5 ± 117)] µg L -1 than Ogun State groundwater [sum REEs range (mean ± SD)]; [1.14-232 (22.6 ± 41.1)] µg L -1 . Boreholes are more enriched with REEs than wells. Significant (P < 0.05) positive correlation (R = Pearson) was recorded in Lagos State groundwater between sum REEs and Fe (R = 0.55). However, there were no significant correlations between sum REEs, pH (R = 0.073) and HCO 3 2- (R = 0.157) in Ogun State groundwater. Chondrite-normalized plot shows that Lagos groundwater exhibits positive Ce anomaly, while Ogun State groundwater does not. The source of REE in Lagos State may be from the ocean and leaching from wastes dumpsites, while the source in Ogun State groundwater may be from the rocks.

  6. Mothers' human papilloma virus knowledge and willingness to vaccinate their adolescent daughters in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Ezenwa BN

    2013-07-01

    Full Text Available Beatrice N Ezenwa,1 Mobolanle R Balogun,2 Ifeoma P Okafor2 1Department of Pediatrics, 68 Nigerian Army Reference Hospital, Lagos State, Nigeria; 2Department of Community Health and Primary Care, College of Medicine, University of Lagos, Lagos State, Nigeria Introduction: Human papillomavirus (HPV is one of the most common sexually transmitted infections in sexually active adolescents and young women and has been implicated as a cause of the majority of cases of cervical cancer, which is the second most common cancer in women in Nigeria. HPV is preventable with the use of HPV vaccines. Objectives: The objective of this study was to assess mothers' HPV knowledge and their willingness to vaccinate their adolescent daughters in Lagos, Nigeria. Materials and methods: This study was a community-based, descriptive cross-sectional study carried out in July, 2012 in Shomolu Local Government Area (LGA of Lagos State, Nigeria. Multistage sampling method was employed to select the 290 respondents who participated in the study. Structured, pretested, interviewer-administered questionnaires were used for data collection. Data was analyzed with Epi-Info™ version 7. Results: The study revealed low awareness of HPV (27.9% and HPV vaccines (19.7% among the mothers that participated. There was a high awareness for cervical cancer but little knowledge of its link to HPV. Awareness and utilization of HPV vaccines increased with increasing educational level (P<0.05. There was a high willingness and intention among the mothers to vaccinate their girls (88.9% and to recommend the vaccine to others (91.0%. Accessibility and affordability of the HPV vaccines were found to be possible barriers to future utilization of the vaccines. Conclusion: Despite low knowledge about HPV and HPV vaccines, mothers were willing to vaccinate their daughters. We recommend improving mothers' knowledge by education and the possible inclusion of the vaccine in the national immunization

  7. Stakeholders views on why child overweight and obesity is rising in Lagos, Nigeria: A qualitative study

    Directory of Open Access Journals (Sweden)

    Adeteju A Adedini

    2016-01-01

    Full Text Available Background and Objective: According to the World Health Organization, the number of obese children would increase to 70 million by 2025 if no intervention is made. An increase in the prevalence of overweight and obesity among school children in Lagos State, Nigeria has been established, but specific factors promoting its prevalence are unknown. The aim of this study was to elicit the views of stakeholders on the perceived causes for the rise in child overweight and obesity. Methods: Five focus group discussions were conducted with different groups of stakeholders involved in child care, namely: Parents, teachers, and healthcare givers. Participants were recruited using a purposive sampling method; a structured question guide was employed for the discussion sessions. The discussions were recorded, collated, and analyzed using grounded theory to extract themes. Results: Six themes emerged as factors responsible for the rise, of which civilization and lifestyle imbalance of the populace emerged as the prominent cause. Of the fifty respondents, 76% of respondents identified parents (particularly young mothers as major contributors to the prevalence of overweight and obesity in children of Lagos State; and 52.3% of the participants reported that a direct relationship exists between income class of parent and weight of a child resident in Lagos. Conclusion: Civilization and lifestyle imbalance, insecurity and congestion, low level of public awareness, inadequate educative and enlightenment programs, myths and societal perception were factors identified to responsible for the rise in the prevalence of child obesity in Lagos, Nigeria. Preventive strategies to control the prevalence of overweight and obesity in children residing in Lagos State should be considered for further studies.

  8. Sedimentation survey of Lago Cerrillos, Ponce, Puerto Rico, April-May 2008

    Science.gov (United States)

    Soler-López, Luis R.

    2011-01-01

    Lago Cerrillos dam, located in the municipality of Ponce in southern Puerto Rico, was constructed in 1991 as part of the multipurpose Rio Portugues and Bucana Project. This project provides flood protection, water supply, and recreation facilities for the municipio of Ponce. The reservoir had an original storage capacity of 38.03 million cubic meters at maximum conservation pool elevation of 174.65 meters above mean sea level and a drainage area of 45.32 square kilometers. Sedimentation in Lago Cerrillos reservoir has reduced the storage capacity from 38.03 million cubic meters in 1991 to 37.26 million cubic meters in 2008, which represents a total storage loss of about 2 percent. During July 29 to August 23, 2002, 8,492 cubic meters of sediment were removed from the Rio Cerrillos mouth of the reservoir. Taking into account this removed material, the total water-storage loss as of 2008 is 778,492 cubic meters, and the long-term annual water-storage capacity loss rate is about 45,794 cubic meters per year or about 0.12 percent per year. The Lago Cerrillos net sediment-contributing drainage area has an average sediment yield of about 1,069 cubic meters per square kilometer per year. Sediment accumulation in Lago Cerrillos is not uniformly distributed and averages about 3 meters in thickness. This represents a sediment deposition rate of about 18 centimeters per year. On the basis of the 2008 reservoir storage capacity of 37.26 million cubic meters per year and a long-term sedimentation rate of 45,794 cubic meters per year, Lago Cerrillos is estimated to have a useful life of about 814 years or until the year 2822.

  9. Assessing the deep drilling potential of Lago de Tota, Colombia, with a seismic survey

    Science.gov (United States)

    Bird, B. W.; Wattrus, N. J.; Fonseca, H.; Velasco, F.; Escobar, J.

    2015-12-01

    Reconciling orbital-scale patterns of inter-hemispheric South American climate during the Quaternary requires continuous, high-resolution paleoclimate records that span multiple glacial cycles from both hemispheres. Southern Andean Quaternary climates are represented by multi-proxy results from Lake Titicaca (Peru-Bolivia) spanning the last 400 ka and by pending results from the Lago Junin Drilling Project (Peru). Although Northern Andean sediment records spanning the last few million years have been retrieved from the Bogota and Fúquene Basins in the Eastern Cordillera of the Colombian Andes, climatic reconstructions based on these cores have thus far been limited to pollen-based investigations. When viewed together with the Southern Hemisphere results, these records suggest an anti-phased hemispheric climatic response during glacial cycles. In order to better assess orbital-scale climate responses, however, independent temperature and hydroclimate proxies from the Northern Hemisphere are needed in addition to vegetation histories. As part of this objective, an effort is underway to develop a paleoclimate record from Lago de Tota (3030 m asl), the largest lake in Colombia and the third largest lake in the Andes. One of 17 highland tectonic basins in Eastern Cordillera, Lago de Tota formed during Tertiary uplift that deformed pre-foreland megasequences, synrift and back-arc megasequences. The precise age and thickness of sediments in the Lago de Tota basin has not previously been established. Here, we present results from a recent single-channel seismic reflection survey collected with a small (5 cubic inch) air gun and high-resolution CHIRP sub-bottom data. With these data, we examine the depositional history and sequence stratigraphy of Lago de Tota and assess its potential as a deep drilling target.

  10. Freshwater autotrophic picoplankton: a review

    Directory of Open Access Journals (Sweden)

    John G. STOCKNER

    2002-02-01

    Full Text Available Autotrophic picoplankton (APP are distributed worldwide and are ubiquitous in all types of lakes of varying trophic state. APP are major players in carbon production in all aquatic ecosystems, including extreme environments such as cold ice-covered and/or warm tropical lakes and thermal springs. They often form the base of complex microbial food webs, becoming prey for a multitude of protozoan and micro-invertebrate grazers, that effectively channel APP carbon to higher trophic levels including fish. In this review we examine the existing literature on freshwater autotrophic picoplankton, setting recent findings and current ecological issues within an historic framework, and include a description of the occurrence and distribution of both single-cell and colonial APP (picocyanobacteria in different types of lakes. In this review we place considerable emphasis on methodology and ecology, including sampling, counting, preservation, molecular techniques, measurement of photosynthesis, and include extensive comment on their important role in microbial food webs. The model outlined by Stockner of an increase of APP abundance and biomass and a decrease of its relative importance with the increase of phosphorus concentration in lakes has been widely accepted, and only recently confirmed in marine and freshwater ecosystems. Nevertheless the relationship which drives the APP presence and importance in lakes of differing trophic status appears with considerable variation so we must conclude that the success of APP in oligotrophic lakes worldwide is not a certainty but highly probable.

  11. Characterization of a Freshwater Crab Sudanonautes aubryi ...

    African Journals Online (AJOL)

    SARAH

    2014-01-31

    Jan 31, 2014 ... Recently, Cumberlidge and. Reed (2004) described the freshwater crab genus. Erimetopus of Congo basin. Sudanonautes aubryi, like all others edible crabs are also poorly understood. This preliminary study was undertaken to collect and realize a biometric characterization of this common freshwater crab ...

  12. Freshwater Ecology. LC Science Tracer Bullet.

    Science.gov (United States)

    Niskern, Diana, Comp.

    Freshwater ecosystems include lakes, ponds, streams, rivers, and certain types of wetlands. This literature and resources guide is not intended to be a comprehensive bibliography on freshwater ecology; the guide is designed--as the name of the series implies--to put the reader or student "on target." Other literature guides related to…

  13. How Will Climate Change Affect Freshwater Fishing?

    OpenAIRE

    Gilbert, Lael; Smith, Jordan W.

    2016-01-01

    This fact sheet reviews how climate change can affect freshwater fishing in the United States. Climate change can affect the availability and diversity of target species, the environmental and aesthetic quality of fishing sites, as well as the policies used to manage freshwater fishing.

  14. Effects of Pollution on Freshwater Fish.

    Science.gov (United States)

    Brungs, W. A.; And Others

    1978-01-01

    Presents a literature review of the effects of pollution on freshwater fish, covering publications of 1976-77. This review includes: (1) water quality; (2) pesticide pollutants; (3) chemical pollutants; (4) miscellaneous pollutants; and (5) physical factors of pollution on freshwater fish. A list of 338 references is also presented. (HM)

  15. Farming of Freshwater Rainbow Trout in Denmark

    DEFF Research Database (Denmark)

    Jokumsen, Alfred; Svendsen, Lars Moeslund

    Textbook on Farming of Freshwater Rainbow Trout in Denmark. Danish edition with the title: Opdræt af regnbueørred i Danmark......Textbook on Farming of Freshwater Rainbow Trout in Denmark. Danish edition with the title: Opdræt af regnbueørred i Danmark...

  16. Tidal Freshwater Wetlands: Variation and Changes

    NARCIS (Netherlands)

    Barendregt, A.; Swarth, C.W.

    2013-01-01

    Tidal freshwater wetlands (TFW) are situated in the upper estuary in a zone bordered upstream by the nontidal river and downstream by the oligohaline region. Here, discharge of freshwater from the river and the daily tidal pulse from the sea combine to create conditions where TFW develop. TFW

  17. Integrating the social, hydrological and ecological dimensions of freshwater health: The Freshwater Health Index.

    Science.gov (United States)

    Vollmer, Derek; Shaad, Kashif; Souter, Nicholas J; Farrell, Tracy; Dudgeon, David; Sullivan, Caroline A; Fauconnier, Isabelle; MacDonald, Glen M; McCartney, Matthew P; Power, Alison G; McNally, Amy; Andelman, Sandy J; Capon, Timothy; Devineni, Naresh; Apirumanekul, Chusit; Ng, Cho Nam; Rebecca Shaw, M; Wang, Raymond Yu; Lai, Chengguang; Wang, Zhaoli; Regan, Helen M

    2018-06-15

    Degradation of freshwater ecosystems and the services they provide is a primary cause of increasing water insecurity, raising the need for integrated solutions to freshwater management. While methods for characterizing the multi-faceted challenges of managing freshwater ecosystems abound, they tend to emphasize either social or ecological dimensions and fall short of being truly integrative. This paper suggests that management for sustainability of freshwater systems needs to consider the linkages between human water uses, freshwater ecosystems and governance. We present a conceptualization of freshwater resources as part of an integrated social-ecological system and propose a set of corresponding indicators to monitor freshwater ecosystem health and to highlight priorities for management. We demonstrate an application of this new framework -the Freshwater Health Index (FHI) - in the Dongjiang River Basin in southern China, where stakeholders are addressing multiple and conflicting freshwater demands. By combining empirical and modeled datasets with surveys to gauge stakeholders' preferences and elicit expert information about governance mechanisms, the FHI helps stakeholders understand the status of freshwater ecosystems in their basin, how ecosystems are being manipulated to enhance or decrease water-related services, and how well the existing water resource management regime is equipped to govern these dynamics over time. This framework helps to operationalize a truly integrated approach to water resource management by recognizing the interplay between governance, stakeholders, freshwater ecosystems and the services they provide. Copyright © 2018 The Authors. Published by Elsevier B.V. All rights reserved.

  18. The toxicity of MEA and amine waste water samples using standardised freshwater bioassays

    OpenAIRE

    Brooks, S.; Heiaas, H.; Lillicrap, A.

    2013-01-01

    Water samples provided by Tel-Tek AS were assessed for their toxicity to freshwater organisms from three trophic groups. The water samples included pure monoethanolamine (MEA) and two amine waste water mixtures described as Amine Reactor Waste (ARW) and treated amine waste water (TW). The toxicity of these three test solutions to the unicellular algae Pseudokirchneriella subcapitata, the freshwater crustacean Daphnia magna, and the embryos of the zebra fish Danio rerio were performed in accor...

  19. The freshwater reservoir effect in radiocarbon dating

    DEFF Research Database (Denmark)

    Philippsen, Bente

    2013-01-01

    effect on radiocarbon dating in an estuarine environment is examined. Here, freshwater influence causes reservoir ages to vary between 250 and 700 14C years during the period 5400 BC - AD 700. The examples in this study show clearly that the freshwater reservoir effect can seriously corrupt radiocarbon......The freshwater reservoir effect can result in anomalously old radiocarbon ages of samples from lakes and rivers. This includes the bones of people whose subsistence was based on freshwater fish, and pottery in which fish was cooked. Water rich in dissolved ancient calcium carbonates, commonly known...... as hard water, is the most common reason for the freshwater reservoir effect. It is therefore also called hardwater effect. Although it has been known for more than 60 years, it is still less well-recognized by archaeologists than the marine reservoir effect. The aim of this study is to examine the order...

  20. Freshwater to seawater transitions in migratory fishes

    Science.gov (United States)

    Zydlewski, Joseph D.; Michael P. Wilkie,

    2012-01-01

    The transition from freshwater to seawater is integral to the life history of many fishes. Diverse migratory fishes express anadromous, catadromous, and amphidromous life histories, while others make incomplete transits between freshwater and seawater. The physiological mechanisms of osmoregulation are widely conserved among phylogenetically diverse species. Diadromous fishes moving between freshwater and seawater develop osmoregulatory mechanisms for different environmental salinities. Freshwater to seawater transition involves hormonally mediated changes in gill ionocytes and the transport proteins associated with hypoosmoregulation, increased seawater ingestion and water absorption in the intestine, and reduced urinary water losses. Fishes attain salinity tolerance through early development, gradual acclimation, or environmentally or developmentally cued adaptations. This chapter describes adaptations in diverse taxa and the effects of salinity on growth. Identifying common strategies in diadromous fishes moving between freshwater and seawater will reveal the ecological and physiological basis for maintaining homeostasis in different salinities, and inform efforts to conserve and manage migratory euryhaline fishes.

  1. Dam failure analysis for the Lago El Guineo Dam, Orocovis, Puerto Rico

    Science.gov (United States)

    Gómez-Fragoso, Julieta; Heriberto Torres-Sierra,

    2016-08-09

    The U.S. Geological Survey, in cooperation with the Puerto Rico Electric Power Authority, completed hydrologic and hydraulic analyses to assess the potential hazard to human life and property associated with the hypothetical failure of the Lago El Guineo Dam. The Lago El Guineo Dam is within the headwaters of the Río Grande de Manatí and impounds a drainage area of about 4.25 square kilometers.The hydrologic assessment was designed to determine the outflow hydrographs and peak discharges for Lago El Guineo and other subbasins in the Río Grande de Manatí hydrographic basin for three extreme rainfall events: (1) a 6-hour probable maximum precipitation event, (2) a 24-hour probable maximum precipitation event, and (3) a 24-hour, 100-year recurrence rainfall event. The hydraulic study simulated a dam failure of Lago El Guineo Dam using flood hydrographs generated from the hydrologic study. The simulated dam failure generated a hydrograph that was routed downstream from Lago El Guineo Dam through the lower reaches of the Río Toro Negro and the Río Grande de Manatí to determine water-surface profiles developed from the event-based hydrologic scenarios and “sunny day” conditions. The Hydrologic Engineering Center’s Hydrologic Modeling System (HEC–HMS) and Hydrologic Engineering Center’s River Analysis System (HEC–RAS) computer programs, developed by the U.S. Army Corps of Engineers, were used for the hydrologic and hydraulic modeling, respectively. The flow routing in the hydraulic analyses was completed using the unsteady flow module available in the HEC–RAS model.Above the Lago El Guineo Dam, the simulated inflow peak discharges from HEC–HMS resulted in about 550 and 414 cubic meters per second for the 6- and 24-hour probable maximum precipitation events, respectively. The 24-hour, 100-year recurrence storm simulation resulted in a peak discharge of about 216 cubic meters per second. For the hydrologic analysis, no dam failure conditions are

  2. Non-parallel divergence across freshwater and marine three-spined stickleback Gasterosteus aculeatus populations.

    Science.gov (United States)

    Pujolar, J M; Ferchaud, A L; Bekkevold, D; Hansen, M M

    2017-07-01

    This work investigated whether multiple freshwater populations of three-spined stickleback Gasterosteus aculeatus in different freshwater catchments in the Jutland Peninsula, Denmark, derived from the same marine populations show repeated adaptive responses. A total of 327 G. aculeatus collected at 13 sampling locations were screened for genetic variation using a combination of 70 genes putatively under selection and 26 neutral genes along with a marker linked to the ectodysplasin gene (eda), which is strongly correlated with plate armour morphs in the species. A highly significant genetic differentiation was found that was higher among different freshwater samples than between marine-freshwater samples. Tests for selection between marine and freshwater populations showed a very low degree of parallelism and no single nucleotide polymorphism was detected as outlier in all freshwater-marine pairwise comparisons, including the eda. This suggests that G. aculeatus is not necessarily the prime example of parallel local adaptation suggested in much of the literature and that important exceptions exist (i.e. the Jutland Peninsula). While marine populations in the results described here showed a high phenotype-genotype correlation at eda, a low association was found for most of the freshwater populations. The most extreme case was found in the freshwater Lake Hald where all low-plated phenotypes were either homozygotes for the allele supposed to be associated with completely plated morphs or heterozygotes, but none were homozygotes for the putative low-plated allele. Re-examination of data from seven G. aculeatus studies agrees in showing a high but partial association between phenotype-genotype at eda in G. aculeatus freshwater populations and that mismatches occur everywhere in the European regions studied (higher in some areas, i.e. Denmark). This is independent of the eda marker used. © 2017 The Fisheries Society of the British Isles.

  3. The relationship between red blood cell distribution width and blood pressure in patients with type 2 diabetes mellitus in Lagos, Nigeria

    OpenAIRE

    Dada, Olusola Akinola; Uche, Ebele; Akinbami, Akinsegun; Odesanya, Majeed; John-Olabode, Sarah; Adediran, Adewumi; Oshinaike, Olajumoke; Ogbera, Anthonia Okeoghene; Okunoye, Olaitan; Arogundade, Olanrewaju; Aile, Kingsley; Ekwere, Timothy

    2014-01-01

    Olusola Akinola Dada,1 Ebele Uche,2 Akinsegun Akinbami,2 Majeed Odesanya,3 Sarah John-Olabode,4 Adewumi Adediran,5 Olajumoke Oshinaike,1 Anthonia Okeoghene Ogbera,1 Olaitan Okunoye,6 Olanrewaju Arogundade,2 Kingsley Aile,7 Timothy Ekwere8 1Department of Medicine, Lagos State University, 2Department of Haematology and Blood Transfusion, Lagos State University, College of Medicine, Ikeja, Nigeria; 3Oak Hospitals, Ikorodu, Lagos, Nigeria; 4Department of Haematology, Ben Carson School of Medicine...

  4. ACCESSIBILITY TO MOBILE TELECOMMUNICATION SERVICES AND ADOPTION OF E-LEARNING IN TERTIARY EDUCATIONAL INSTITUTIONS IN LAGOS STATE, NIGERIA: A PILOT STUDY

    OpenAIRE

    ONIGBINDE Isaac Oladepo

    2013-01-01

    The primary aim of this survey was to examine the effect of accessibility to mobile telecommunication service on the adoption of e-learning in tertiary educational institutions in Lagos State, Nigeria. One hundred students of the University of Lagos and Lagos State University were randomly selected and administered questionnaire at pilot stage. Two hypotheses were postulated to guide the study. Data were analyzed using descriptive statistics and parametric statistical tool for correlational a...

  5. Effect of sustainability information on consumers' liking of freshwater prawn (Macrobrachium rosenbergii).

    Science.gov (United States)

    Simoes, Julia Siqueira; Mársico, Eliane Teixeira; da Cruz, Adriano Gomes; de Freitas, Mônica Queiroz; Doro, Laís Higino; Conte-Junior, Carlos Adam

    2015-12-01

    This research aimed to investigate whether consumer acceptance is affected by information on sustainable practices on the product label. Hedonic evaluations of freshwater prawns were performed by 80 consumers under three aspects: the blind condition - consumers taste samples without information; expected - without tasting samples, consumers evaluated the message 'Freshwater prawns were grown using sustainable practices, reducing environmental impacts caused by traditional breeding'; informed - in which prawns were tasted and the card evaluated. For the entire consumer group, it was observed that the message about sustainability on packaging increased freshwater prawn acceptability (8.25, expected condition (E) versus 6.75, blind condition (B)). High scores were observed under all three test conditions, ranging from 6 (like slightly) to 9 (like extremely), on a 9-point scale. It can be concluded that the use of sustainable information can influence consumers' perception and increase their preference toward freshwater prawns, and even increase the sensory attributes of the product. © 2014 Society of Chemical Industry.

  6. Habitat availability does not explain the species richness patterns of European lentic and lotic freshwater animals

    DEFF Research Database (Denmark)

    Dehling, D.M.; Hof, C.; Brandle, M.

    2010-01-01

    of species richness. We tested whether habitat availability can account for the differences in species richness patterns between European lentic and lotic freshwater animals. Location Europe. Methods We compiled occurrence data of 1959 lentic and 2445 lotic species as well as data on the amount of lentic......Aim In Europe, the relationships between species richness and latitude differ for lentic (standing water) and lotic (running water) species. Freshwater animals are highly dependent on suitable habitat, and thus the distribution of available habitat should strongly influence large-scale patterns...... with latitude. Main conclusions Habitat availability and diversity are poor predictors of species richness of the European freshwater fauna across large scales. Our results indicate that the distributions of European freshwater animals are probably not in equilibrium and may still be influenced by history...

  7. Primary productivity of the phytoplankton in a tropical Brazilian shallow lake: experiments in the lake and in mesocosms Produtividade primária em um lago tropical raso brasileiro: experimentos no lago e em mesocosmos

    Directory of Open Access Journals (Sweden)

    Eliana Garcia Feresin

    2010-12-01

    Full Text Available AIM: To evaluate the primary productivity of the phytoplankton in the Lake Monte Alegre, southeastern Brazil, and the factors that influence its fluctuations, experiments were carried out in the lake and in mesocosm; METHODS: Primary productivity rates were measured using the 14C technique, in experiments carried out monthly in the lake, during one year, and in two mesocosm experiments, one in the winter and another in the summer. Other factors also analyzed were temperature, dissolved oxygen, pH, electrical conductivity, chlorophyll-a, alkalinity, nutrients, and nitrogen limitation. Hypotheses on the influence of grazing and excretion by zooplankton and fish on phytoplankton properties were tested in two mesocosm experiments; RESULTS: Higher PP in the water column of the lake occurred in the transition periods, when thermal stratification is unstable, and lower PP in the cool season (frequent mixing and in mid-summer (more stable stratification. The limiting factor in the cool season seems to be mainly temperature and in mid-summer lower light intensities, due to higher rainfall and overcast, N limitation and physical disturbances caused by storms. PP was not influenced by the zooplankton in the experiment I, despite the effect of grazing on other phytoplankton properties. The excretion by the phytoplanktivorous fish (adults of Tilapia rendalli enhanced PP in the experiment II, outweighing grazing on the phytoplankton; CONCLUSIONS: We suppose that the preponderant factors which affected primary productivity in the lake were physical and chemical ones, biotic factors having a secondary role. The thermal behavior of the lake, which is warm discontinuous polymictic, governs nutrient losses and releases, influencing PP in addition to other factors related to seasons.OBJETIVO: Para avaliar a produtividade primária do fitoplâncton e os fatores que influenciam suas flutuações foram feitos experimentos no Lago Monte Alegre e em mesocosmos; M

  8. Sensitivity ranking for freshwater invertebrates towards hydrocarbon contaminants.

    Science.gov (United States)

    Gerner, Nadine V; Cailleaud, Kevin; Bassères, Anne; Liess, Matthias; Beketov, Mikhail A

    2017-11-01

    Hydrocarbons have an utmost economical importance but may also cause substantial ecological impacts due to accidents or inadequate transportation and use. Currently, freshwater biomonitoring methods lack an indicator that can unequivocally reflect the impacts caused by hydrocarbons while being independent from effects of other stressors. The aim of the present study was to develop a sensitivity ranking for freshwater invertebrates towards hydrocarbon contaminants, which can be used in hydrocarbon-specific bioindicators. We employed the Relative Sensitivity method and developed the sensitivity ranking S hydrocarbons based on literature ecotoxicological data supplemented with rapid and mesocosm test results. A first validation of the sensitivity ranking based on an earlier field study has been conducted and revealed the S hydrocarbons ranking to be promising for application in sensitivity based indicators. Thus, the first results indicate that the ranking can serve as the core component of future hydrocarbon-specific and sensitivity trait based bioindicators.

  9. Novel Synechococcus Genomes Reconstructed from Freshwater Reservoirs

    Directory of Open Access Journals (Sweden)

    Pedro J. Cabello-Yeves

    2017-06-01

    Full Text Available Freshwater picocyanobacteria including Synechococcus remain poorly studied at the genomic level, compared to their marine representatives. Here, using a metagenomic assembly approach we discovered two novel Synechococcus sp. genomes from two freshwater reservoirs Tous and Lake Lanier, both sharing 96% average nucleotide identity and displaying high abundance levels in these two lakes located at similar altitudes and temperate latitudes. These new genomes have the smallest estimated size (2.2 Mb and average intergenic spacer length (20 bp of any previously sequenced freshwater Synechococcus, which may contribute to their success in oligotrophic freshwater systems. Fluorescent in situ hybridization confirmed that Synechococcus sp. Tous comprises small cells (0.987 ± 0.139 μm length, 0.723 ± 0.119 μm width that amount to 90% of the picocyanobacteria in Tous. They appear together in a phylogenomic tree with Synechococcus sp. RCC307 strain, the main representative of sub-cluster 5.3 that has itself one of the smallest marine Synechococcus genomes. We detected a type II phycobilisome (PBS gene cluster in both genomes, which suggests that they belong to a phycoerythrin-rich pink low-light ecotype. The decrease of acidic proteins and the higher content of basic transporters and membrane proteins in the novel Synechococcus genomes, compared to marine representatives, support their freshwater specialization. A sulfate Cys transporter which is absent in marine but has been identified in many freshwater cyanobacteria was also detected in Synechococcus sp. Tous. The RuBisCo subunits from this microbe are phylogenetically close to the freshwater amoeba Paulinella chromatophora symbiont, hinting to a freshwater origin of the carboxysome operon of this protist. The novel genomes enlarge the known diversity of freshwater Synechococcus and improve the overall knowledge of the relationships among members of this genus at large.

  10. Status and Impacts of Arctic Freshwater Export

    Science.gov (United States)

    Haine, T. W. N.

    2017-12-01

    Large freshwater anomalies clearly exist in the Arctic Ocean. For example, liquid freshwater has accumulated in the Beaufort Gyre in the decade of the 2000s compared to 1980-2000, with an extra ≈5000 km3—about 25%—being stored. The sources of freshwater to the Arctic from precipitation and runoff have increased between these periods (most of the evidence comes from models). Despite flux increases from 2001 to 2011, it is uncertain if the marine freshwater source through Bering Strait for the 2000s has changed, as observations in the 1980s and 1990s are incomplete. The marine freshwater fluxes draining the Arctic through Fram and Davis straits are also insignificantly different. In this way, the balance of sources and sinks of freshwater to the Arctic, Canadian Arctic Archipelago (CAA), and Baffin Bay shifted to about 1200±730 km3yr-1 freshening the region, on average, during the 2000s. The observed accumulation of liquid freshwater is consistent with this increased supply and the loss of freshwater from sea ice (Figure, right). Evidence exists that such discharges can impact the Atlantic meridional overturning circulation, and hence Atlantic sector climate. Nevertheless, it appears that the observed AMOC variability since 2004, when high quality measurements began, is not attributable to anthropogenic influence. This work is based on, and updated from, Haine et al. (2015), Carmack et al. (2016), and Haine (2016). Haine, T. W. N. Ocean science: Vagaries of Atlantic overturning. Nature Geoscience, 9, 479-480, 10.1038/ngeo2748, 2016. T. W. N. Haine et al., Arctic Freshwater Export: Status, Mechanisms, and Prospects, Global Planetary Change, 125, 13-35, 10.1016/j.glopacha.2014.11.013, 2015. E. Carmack et al., Fresh water and its role in the Arctic Marine System: sources, disposition, storage, export, and physical and biogeochemical consequences in the Arctic and global oceans. J. G. Res. Biogeosciences, 10.1002/2015JG003140, 2016.

  11. Novel Synechococcus Genomes Reconstructed from Freshwater Reservoirs

    Science.gov (United States)

    Cabello-Yeves, Pedro J.; Haro-Moreno, Jose M.; Martin-Cuadrado, Ana-Belen; Ghai, Rohit; Picazo, Antonio; Camacho, Antonio; Rodriguez-Valera, Francisco

    2017-01-01

    Freshwater picocyanobacteria including Synechococcus remain poorly studied at the genomic level, compared to their marine representatives. Here, using a metagenomic assembly approach we discovered two novel Synechococcus sp. genomes from two freshwater reservoirs Tous and Lake Lanier, both sharing 96% average nucleotide identity and displaying high abundance levels in these two lakes located at similar altitudes and temperate latitudes. These new genomes have the smallest estimated size (2.2 Mb) and average intergenic spacer length (20 bp) of any previously sequenced freshwater Synechococcus, which may contribute to their success in oligotrophic freshwater systems. Fluorescent in situ hybridization confirmed that Synechococcus sp. Tous comprises small cells (0.987 ± 0.139 μm length, 0.723 ± 0.119 μm width) that amount to 90% of the picocyanobacteria in Tous. They appear together in a phylogenomic tree with Synechococcus sp. RCC307 strain, the main representative of sub-cluster 5.3 that has itself one of the smallest marine Synechococcus genomes. We detected a type II phycobilisome (PBS) gene cluster in both genomes, which suggests that they belong to a phycoerythrin-rich pink low-light ecotype. The decrease of acidic proteins and the higher content of basic transporters and membrane proteins in the novel Synechococcus genomes, compared to marine representatives, support their freshwater specialization. A sulfate Cys transporter which is absent in marine but has been identified in many freshwater cyanobacteria was also detected in Synechococcus sp. Tous. The RuBisCo subunits from this microbe are phylogenetically close to the freshwater amoeba Paulinella chromatophora symbiont, hinting to a freshwater origin of the carboxysome operon of this protist. The novel genomes enlarge the known diversity of freshwater Synechococcus and improve the overall knowledge of the relationships among members of this genus at large. PMID:28680419

  12. Travel Characteristics and Commuting Pattern of Lagos Metropolis Residents: an Assessment

    Directory of Open Access Journals (Sweden)

    OSOBA, Samson Babatunde

    2015-06-01

    Full Text Available Urban travel is not solely the function of travel, but also on people’s participation in activities and how these were done. This study utilized 2,500 households’ samples in Lagos metropolis. The questionnaire about intra-city trip patterns was administered in direct proportion to the population size of each Local Government Areas (LGAs. Systematic sampling technique was used to select every tenth building on the identified streets. lt is observed that more than 95% of residents depends on roads, while less than 5% depends on Rail and Ferry. Work and business trips characterized the weekdays, while social, shopping and recreation trips dominate the weekends. This situation leads to too many vehicular traffic on the roads during the peak periods, leading to congestion and loss of valuable man-hours. Transportation planners in Lagos need to develop alternative intra-city transportation systems.

  13. Efecto de la impermeabilidad del Mucílago de Nopal en bloques de tierra comprimidos

    Directory of Open Access Journals (Sweden)

    Yolanda Guadalupe Aranda Jiménez

    2013-01-01

    Full Text Available La arquitectura de tierra1 es conocida desde hace siglos, sin embargo, actualmente es poco utilizada comparado con los sistemas constructivos comunes. Los bloques de tierra comprimido (BTC son elementos constructivos con un potencial elevado para ser utilizado en las construcciones de vivienda en México, principalmente por su similitud con los bloques tradicionales, siendo conveniente mejorar sus características a partir de un estabilizante. Se realizó el estudio de BTC estabilizados con cemento y una sustancia proveniente de las pencas maduras de nopal. Se encontró que al añadir mucílago de nopal se observa un incremento significativo de la resistencia a la compresión húmeda y seca, lo cual estar relacionado con una disminución de la porosidad; se ofrecen algunas relaciones del efecto del mucílago en el sólido analizado.

  14. growth pattern and the industrial development of the lagos region, nigeria

    Directory of Open Access Journals (Sweden)

    Dickson Dare Ajayi

    2013-07-01

    Full Text Available This paper examines the nature, growth and spatial pattern of industries within the Lagos Region. Industrial activities in this region grew progressively over the year from mere brickwork, palm oil mills, printing press, soap factory, and metal container factory to capital intensive manufacturing. Indeed, the number of industrial establishments increased from 122 in 1962 to 637 in 1993. Lagos developed into Nigeria's leading industrial center; especially following the expansion in its service and administrative sectors. Whereas, chemicals and pharmaceutical; and basic metal, iron and steel and fabricated metal products industry groups dominate in industrial scene, wood and wood products (including furniture; and non-metallic mineral products are rare. The spatial pattern shows that industrial establishments vary amongst the industrial estates/areas, and also among the industry groups. Ikeja/Ogballsheri industrial estate/area dominates the industrial scene.

  15. The freshwater reservoir effect in radiocarbon dating

    DEFF Research Database (Denmark)

    Philippsen, Bente

    case studies will show the degree of variability of the freshwater reservoir effect over short and long timescales. Radiocarbon dating of recent water samples, aquatic plants and animals, shows that age differences of up to 2000 years can occur within one river. In the Limfjord, freshwater influence...... caused reservoir ages to vary between 250 and 700 years during the period 5400 BC - AD 700. Finally, I will discuss the implications of the freshwater reservoir effect for radiocarbon dating of Mesolithic pottery from inland sites of the Ertebølle culture in Northern Germany....

  16. Electrocardiographic Study in Adult Homozygous Sickle Cell Disease Patients in Lagos, Nigeria

    OpenAIRE

    Dosunmu, Adedoyin; Akinbami, Akinsegun; Uche, Ebele; Adediran, Adewumi; John-Olabode, Sarah

    2016-01-01

    Background. This study sought to identify the pattern of electrocardiographic changes in steady state adult sickle cell anaemia. Methods. A case-control, cross-sectional study was conducted amongst sickle cell patients attending the sickle cell clinic of Lagos State University Teaching Hospital, Ikeja, and HbAA controls. All consenting participants had haemoglobin electrophoresis done and were subjected to electrocardiography (ECG). The descriptive data were given as means ? standard deviatio...

  17. Head circumference of children with sickle cell disease in Lagos, Nigeria

    OpenAIRE

    Senbanjo, Idowu Odunayo; Oshikoya, Kazeem Adeola; Salisu, Mohammed; Diaku-Akinwumi, Ijeoma Nnenna

    2016-01-01

    Introduction Growth retardation and under-nutrition are common in children with sickle cell disease (SCD). The aim of this study was to compare the head circumference (HC) of SCD children and non-SCD children and to determine the effect of malnutrition on head circumference of children with SCD. Methods This was a prospective case-control study conducted at the Lagos State University Teaching Hospital, Nigeria, involving SCD children (subject, n = 118) and non-SCD children (control, n = 118) ...

  18. The influence of male partners on contraceptive usage in sub-Saharan Africa-Lagos experience

    OpenAIRE

    Omololu Adegbola; Fatimah Murtazha Habeebu-Adeyemi

    2016-01-01

    Background: Family planning programs, researches, and studies have focused mainly on women with little attention to men′s role in the contraceptive choices by the couple. Men′s exclusion from these programs has serious implications on the acceptance and use of contraceptives by the couple. Objective: To determine the influence of male partners on contraceptive use of their spouses. Subjects and Methods: This was a cross-sectional descriptive study at a Tertiary Care Centre in Lagos, Nigeria. ...

  19. An Audit of Anaesthesia Record-keeping at the Lagos University ...

    African Journals Online (AJOL)

    An Audit of Anaesthesia Record-keeping at the Lagos University Teaching Hospital. ... in the re-audit were Pre-operative history (51% to 91% p<0.0001), blood pressure (65% to 78% p=0.04), pulse rate (47% to 65% p=0.015), administration of premedication (30% to 63% p<0.001), and ASA score (60% to 78%, p=0.009).

  20. Airline Service Quality Dimensions and Customer Loyalty: Empirical Evidence from Air Passengers’ in Lagos State

    OpenAIRE

    Ben Akpoyomare Oghojafor; Kunle Adeosun Ladipo Patrick; Ganiyu Rahim Ajao

    2016-01-01

    Air travellers are increasingly becoming more demanding in terms of their expectations of the quality of service offered by airline carriers. Hence, operators must improve service delivery to retain their loyalty. This study investigates the relationship between airline service quality dimensions and customer loyalty among air passengers in Lagos state. Causal research design was adopted to examine the aforementioned relationship. Convenience sampling technique was used to survey 600 air trav...

  1. Reprint of Ecological health status of the Lagos wetland ecosystems: Implications for coastal risk reduction

    Science.gov (United States)

    Agboola, Julius I.; Ndimele, Prince E.; Odunuga, Shakirudeen; Akanni, Adeniran; Kosemani, Bosede; Ahove, Michael A.

    2016-12-01

    Lagos, a major urban agglomeration in the world is characterized by wetlands and basin for upstream rivers such as Ogun, Oshun and Yewa Rivers. Ongoing environmental pressures exerted by large-scale land reclamation for residential quarters, refuse and sewage dumping, and other uses, however, are suspected to have had a substantial impact on ecological health of the Lagos wetland ecosystems over the last few decades. To determine the impact of these pressures, we examined spatial changes in three wetlands areas- Badore/Langbasa (BL), Festac/Iba/Ijegun (FI) and Ologe/Otto-Awori (OO) through field sample collection and analyses of surface water, sediments, air-water interface gas fluxes and vegetations. Surface water conductivity, total suspended solids (TSS), alkalinity, chloride, biological oxygen demand (BOD), nitrate, phosphate and heavy metals (Zn, Cu, Fe, Na, Mn, Pb, Cd, K and Ni) exhibited relative spatial stability while other water quality parameters varied significantly (P < 0.05) across the wetland areas. Also, dissolved inorganic carbon (DIC) contributed to most of the total dissolved solids (TDS) since only DIC correlated significantly with TDS (r = 0.889; P = 0.05, n = 12) and TS (r = 0.891; P = 0.05, n = 12), suggesting a strong capacity for carbon sequestration and carbon sink across the wetland areas. None of the encountered vegetation species are in the vulnerable category of the International Union for Conservation of Nature (IUCN). There are indications of steady rise in greenhouse gas levels in Lagos since air CO2 value at BL have reached global threshold of 400 ppm with OO and FI closely approaching. We conclude that the Lagos wetland ecosystems, especially OO and FI still have some semblance of natural habitat. However, further destruction and unwise use of the resources could cause damage to physical, chemical, geological and biological processes in nature, which could result to grave socio-economic and cultural consequences to the local

  2. Ecological health status of the Lagos wetland ecosystems: Implications for coastal risk reduction

    Science.gov (United States)

    Agboola, Julius I.; Ndimele, Prince E.; Odunuga, Shakirudeen; Akanni, Adeniran; Kosemani, Bosede; Ahove, Michael A.

    2016-12-01

    Lagos, a major urban agglomeration in the world is characterized by wetlands and basin for upstream rivers such as Ogun, Oshun and Yewa Rivers. Ongoing environmental pressures exerted by large-scale land reclamation for residential quarters, refuse and sewage dumping, and other uses, however, are suspected to have had a substantial impact on ecological health of the Lagos wetland ecosystems over the last few decades. To determine the impact of these pressures, we examined spatial changes in three wetlands areas- Badore/Langbasa (BL), Festac/Iba/Ijegun (FI) and Ologe/Otto-Awori (OO) through field sample collection and analyses of surface water, sediments, air-water interface gas fluxes and vegetations. Surface water conductivity, total suspended solids (TSS), alkalinity, chloride, biological oxygen demand (BOD), nitrate, phosphate and heavy metals (Zn, Cu, Fe, Na, Mn, Pb, Cd, K and Ni) exhibited relative spatial stability while other water quality parameters varied significantly (P < 0.05) across the wetland areas. Also, dissolved inorganic carbon (DIC) contributed to most of the total dissolved solids (TDS) since only DIC correlated significantly with TDS (r = 0.889; P = 0.05, n = 12) and TS (r = 0.891; P = 0.05, n = 12), suggesting a strong capacity for carbon sequestration and carbon sink across the wetland areas. None of the encountered vegetation species are in the vulnerable category of the International Union for Conservation of Nature (IUCN). There are indications of steady rise in greenhouse gas levels in Lagos since air CO2 value at BL have reached global threshold of 400 ppm with OO and FI closely approaching. We conclude that the Lagos wetland ecosystems, especially OO and FI still have some semblance of natural habitat. However, further destruction and unwise use of the resources could cause damage to physical, chemical, geological and biological processes in nature, which could result to grave socio-economic and cultural consequences to the local

  3. Extent of pharmacovigilance among resident doctors in Edo and Lagos states of Nigeria.

    Science.gov (United States)

    Ohaju-Obodo, J O; Iribhogbe, O I

    2010-02-01

    Systematic attention to adverse drug reactions (ADRs) started with the thalidomide disaster in the early 60s of the 20(th) century. In 1968 ten countries supported a spontaneous reporting system for ADR and collaborated with the WHO pilot research project for international drug monitoring. This survey was conducted to determine the level of awareness of resident doctors about ADRs reporting, the extent of their involvement in pharmacovigilance activities and to build a useful data base that will improve the quality of health care in Nigeria. This cross-sectional observational survey was conducted in University of Benin Teaching Hospital (UBTH) and Irrua Specialist Teaching Hospital (ISTH), Lagos University Teaching Hospital (LUTH) and Lagos State University Teaching Hospital (LASUTH) in Edo and Lagos states, Nigeria, respectively. STUDY DESIGN / METHODS: A cross-sectional observational survey was used in this study. Total population under survey being 971 residents with the sample size of 350 statistically determined. The survey conducted revealed that 78.1% (258) of the respondents had inadequate knowledge about pharmacovigilance with 71.2% (235) unaware of the yellow forms for ADR reporting distributed by the National Agency for Food and Drug Administration and Control (NAFDAC). The respondents (92.4%) have observed ADRs in the course of their training and practice, yet only 25.5% of cases were reported. The reported cases (7.3%) were to the National Agency for Food and Drug Administration and Control. The study showed a statistically significant difference between the institution of respondents, knowledge and experience about pharmacovigilance (p Edo and Lagos states. This may be what obtains in other states in Nigeria.

  4. Evaluation of Railway Level Crossing Attributes on Accident Causation in Lagos, Nigeria.

    Directory of Open Access Journals (Sweden)

    Adeolu O Dina

    2017-01-01

    Full Text Available Abstract The study examines the contribution of Railway Level Crossing (RLCphysical attributes to accident occurrence using the12 major level crossings within the Lagos metropolis. The 48km single track mainline section under consideration which barely make up 1.1% of the entire narrow gauge track network of the country within a 5 year period contributed about 45% of the total National crossing accidents recorded in Nigeria. The method of investigation involved recording the individual attributes of each RLC such asgates, pedestrian traffic, car traffic light, proximity of signage to crossing, vehicular traffic as dummy variables.The regression analysis  was used to measure their effect on accidents.The result indicates gates, pedestrians and the location of signage had significant impact on accidents occurrence at level crossings within Lagos metropolis. Based on the findings, enhancement of active warning systems among other recommendations was suggested as potent counter measures for RLC accident reduction. Abstrak Penelitian menguji tingkat kontribusi atribut fisik dari perlintasan jalan kereta api terhadap kejadian kecelakaan menggunakan 12 perlintasan utama dalam kota metropolis Lagos. 48 km jalan utama tunggal menjadi pertimbangan yang hampir meningkat 1.1% dari seluruh trek sempit jaringan negara dalam jangka waktu 5 tahun menyumbang sekitar 45% dari total kecelakaan perlintasan secara Nasional di Nigeria. Metode penelitian melibatkan catatan dari masing-masing atribut RLC seperti pintu gerbang, pejalan kaki, lampu lalu lintas mobil, kedekatan tanda penyebarangan, lalu lintas kendaraan sebagai variabel dumi. Analisis regresi digunakan untuk mengukur pengaruh dari atribut terhadap kecelakaan. Hasilnya menunjukkan pintu gerbang, pejalan kaki, dan lokasi tanda perlintasan mempunyai dampak signifikan pada kecelakaan dalam kota metropolis Lagos.Berdasarkan penemuan tersebut, perbaikan dari sistem peringatan aktif disarankan sebagai upaya

  5. Murciélagos hematófagos como reservorios de la rabia

    Directory of Open Access Journals (Sweden)

    Karin Corrêa Scheffer

    Full Text Available La rabia continua siendo un desafío para las autoridades de salud pública y una limitante para la industria ganadera en América Latina. Caninos silvestres y domésticos, así como murciélagos hematófagos son las principales especies transmisoras y reservorios de la enfermedad. Actualmente, se observa variaciones en el perfil epidemiológico de la rabia, donde la especie de murciélago hematófago Desmodus rotundus se constituye en la principal especie transmisora. A lo largo del tiempo se ha acumulado conocimiento sobre la ecología, biología y comportamiento de esta especie y sobre la historia natural de la rabia, lo cual debe conducir a una continua evolución de los métodos de control poblacional de D. rotundus, prevención y técnicas de diagnóstico. Aún se desconoce la relación ecológica de esta especie con otras hematófagas y no hematófagas, y queda mucho por mejorar en los sistemas de notificación y vigilancia epidemiológica, así como crear una mayor conciencia entre los ganaderos ante el tema. La comprensión del impacto que las modificaciones ambientales inducidas por el hombre ejercen sobre la dinámica de infección del virus de la rabia en los murciélagos debe ser motivo de investigaciones posteriores. Esto requerirá la combinación de estudios de campo con modelos matemáticos y nuevas herramientas diagnósticas. La presente revisión pretende presentar los aspectos más relevantes sobre el rol de los murciélagos hematófagos como reservorios y transmisores del virus de la rabia

  6. Inventory Management Practices and Operational Performance of Flour Milling Firms in Lagos, Nigeria

    OpenAIRE

    Nsikan Efiok John; John Joseph Etim; Tommy Uduak Ime

    2015-01-01

    This study examines inventory management practices of flour milling manufacturing firms and their effects on operational performance. Five flour milling manufacturing firms in Lagos were used for this study. Structured questionnaire was the major instrument for the collection of relevant primary data while descriptive statistics such as mean and standard deviation was deployed to analyzing the data gathered. The results obtained showed that exception of the large manufacturing companies, most...

  7. Malarone treatment failure and in vitro confirmation of resistance of Plasmodium falciparum isolate from Lagos, Nigeria

    OpenAIRE

    Fivelman, Quinton L; Butcher, Geoffrey A; Adagu, Ipemida S; Warhurst, David C; Pasvol, Geoffrey

    2002-01-01

    Abstract We report the first in vitro and genetic confirmation of Malarone® (GlaxoSmithKline; atovaquone and proguanil hydrochloride) resistance in Plasmodium falciparum acquired in Africa. On presenting with malaria two weeks after returning from a 4-week visit to Lagos, Nigeria without prophylaxis, a male patient was given a standard 3-day treatment course of Malarone®. Twenty-eight days later the parasitaemia recrudesced. Parasites were cultured from the blood and the isolate (NGATV01) was...

  8. Consumers’Willingness to Pay for Safety Attributes of Bread in Lagos Metropolis, Nigeria

    OpenAIRE

    Anyam, Osemeke E.; Fashogbon, Ayodele E.; Oni, Omobowale A.

    2013-01-01

    This study examined consumer’s willingness to pay for food safety attributes in bread in Lagos metropolis. It empirically analyzed the factors driving willingness to pay for improved bread and the effect of attributes on willingness to pay and mean willingness to pay for improved bread. The data for the study using a well-structured questionnaire containing Choice Experiment (CE) questions for eliciting willingness to pay was collected from 150 respondents using a two-stage random sampling te...

  9. Evaluación de la contaminación del lago Titicaca

    OpenAIRE

    Ministerio de Agricultura; Instituto Nacional de Recursos Naturales

    1995-01-01

    Evalúa a nivel de reconocimiento, los principales problemas de contaminación del lago Titicaca, comprendido en la parte peruana, así como su área de influencia. De la misma manera, evaluar la Reserva Nacional del Titicaca. Por otro lado, se busca preparar un documento sustentatorio dirigidos a los organismos involucrados en la problemática, con la finalidad de lograr un mejor apoyo y encontrar soluciones inmediatas a los problemas.

  10. La moneda circulante en el archipiélago canario durante el siglo XVIII

    OpenAIRE

    Pedro Damián Cano Borrego

    2016-01-01

    A lo largo del siglo XVIII se produjeron en las Islas Canarias graves problemas m onetarios derivados de la moneda en circulación en el archipiélago, derivados tanto de las falsificaciones como del mantenimiento en la circulación de monedas batidas en los siglos anteriores. Asimismo, la falta de numerario menudo favoreció la entrada de moneda de vellón provincial procedente de Santo Domingo y Puerto Rico. ...

  11. Knowledge, attitude and practice towards child adoption amongst women attending infertility clinics in Lagos State, Nigeria

    Directory of Open Access Journals (Sweden)

    Adenike O. Omosun

    2011-02-01

    Full Text Available Background: Child adoption is a recommended alternative form of infertility management. Infertility is of public health importance in Nigeria and many other developing nations. This is a result of its high prevalence and especially because of its serious social implications as the African society places a passionate premium on procreation in any family setting. Objectives: The aim of this study was to determine the knowledge, attitude and practice of child adoption amongst women attending infertility clinics in teaching hospitals in Lagos State and to determine the factors that influence their attitude and practice towards it.Method: A cross-sectional descriptive design was used. Data were collected by using a structured questionnaire which was interviewer-administered. The study was conducted in the two teaching hospitals in Lagos State (LUTH [Lagos University Teaching Hospital] and LASUTH [Lagos State University Teaching Hospital] from amongst 350 women attending the gynaecological clinics. All the patients under management for infertility at the gynaecology clinics during the period of the study were interviewed.Results: Many respondents (85.7% had heard of child adoption and 59.3% of them knew the correct meaning of the term. More than half of the respondents (68.3% said that they could love an adopted child but less than half of them (33.7% were willing to consider adoption. Only 13.9% has ever adopted a child. The major reason given for their unwillingness to adopt was their desire to have their own biological child. Factors that were favourable towards child adoption were Igbo tribe identity, an age above 40 years, duration of infertility above 15 years, and knowing the correct meaning of child adoption.Conclusion: There is a poor attitude to adoption even amongst infertile couples. Interventions need to be implemented to educate the public on child adoption, to improve their attitude towards adoption and to make it more acceptable.

  12. Evaluation of Energy Use in Public Housing in Lagos, Nigeria: Prospects for Renewable Energy Sources

    OpenAIRE

    Isidore Chukwunweike Ezema; Abiodun O. Olotuah; Olabosipo I. Fagbenle

    2016-01-01

    Even though domestic energy can be from either renewable or non-renewable sources, the former is preferred because of its role in reducing both the operational energy intensity and carbon footprint. Given the positive role renewable energy plays in the energy mix, this paper examined the pattern of operational energy use with particular reference to the renewable and non-renewable energy content in medium and high density public residential buildings in Lagos, Nigeria. A survey research metho...

  13. Acute toxicity of pesticides to the tropical freshwater shrimp Caridina laevis.

    NARCIS (Netherlands)

    Sucahyo, D.; van Straalen, N.M.; Krave, A.S.; van Gestel, C.A.M.

    2008-01-01

    To determine the potential risk of pesticides frequently used in Indonesia, a new toxicity test was developed using the indigenous freshwater shrimp Caridina laevis, which is representative of tropical ecosystems. The test species could easily be maintained in the laboratory. Acute toxicity tests

  14. THE INFLUENCE OF FIRMS STRUCTURAL CHARACTERISTICS ON THE DEGREE OF AGGLOMERATION ECONOMIES ENJOYED AMONGST FIRMS IN THE LAGOS REGION, NIGERIA

    Directory of Open Access Journals (Sweden)

    FAGBOHUNKA Adejompo

    2015-12-01

    Full Text Available Agglomeration economies is a potent tool in socio-economic revamping, rejuvenation and sustenance of regions, this is as a result of the impulse it transmitted through the multiplier effect it is capable of generated. Therefore, this paper underscores the influence of firms structural characteristics on the degree of agglomeration economies enjoyed amongst firms, using the Lagos region as a case study. The first stage in the collection of primary data involves the reconnaissance survey, thereafter one hundred and three questionnaire were administered in twelve industrial estates; one questionnaire in each of the firm. The paper reveals the following structural characteristics as germane to industrial enterprise; age of firms, areal plant size (m², capacity utilization (in percentage, and Labour size and firms investment. The paper has also found out those agglomeration economies enjoyed ranges from transportation, labour, power supply, to joint water supply. The Roy’s Largest Root test employed to test for the significance of the canonical correlations at 0.05 significant levels shows the calculated F-value 3.5247 and the tabulated F-value 2.90. This suggests that the degree of agglomeration economies enjoyed by firms is significantly explained by the size and structural characteristics of the firms. The paper therefore recommends more and active government participation in the industrial scene, given the necessary support for the expansion of firm’s structural characteristics which will lead to increase agglomeration economies enjoyed by these firms.

  15. City Expansion And The Tradgedy Of The Commons: The Case Of Lagos, Nigeria

    Science.gov (United States)

    Omojola, A.

    2007-05-01

    The conflict between the short-term welfare of individuals and the long-term welfare of the society as described by Hardins (1968) always pose serious risk of degradation to the basic life support systems. This scenario is aptly demonstrated by the voracious expansion of cities especially in the developing countries and emerging economies of the world. The risk of degradation which poses serious risks to the functioning of the global commons is even more serious where the city is `evolving' with little or no planning measures to guide city growth and development. The city of Lagos, Nigeria's former capital with a population of over 9million classically exemplifies this case. This study integrates archived base data (maps and aerial photographs) and medium resolution remote sensing data to characterise the spatial evolution of the city of Lagos in over 4 decades (between 1960 and 2005). Specifically, quantitative assessment of the extent and impact of Lagos city expansion on critical ecosystems (wetlands, waterbodies natural/semi natural vegetations, and wilderness) was estimated. In addition, the impact of the loss of supporting, regulating, and cultural functions of natural ecosystems on urban flooding, city temperature/heat islands, and aesthetics in the city is also analysed. The implications of the results both for human health, and as advocacy tool for city planning and management options are also discussed.

  16. Transformative Empowerment in the Lagos State Civil Service: A Gender Policy Discourse

    Directory of Open Access Journals (Sweden)

    Felicia A.D. Oyekanmi

    2016-06-01

    Full Text Available Transformation means positive change to new values and direction. This research is concerned with the relationship between empowerment processes that are transformatory and gender equality in the workplace. Its scope includes integrating a transformatory view into women’s and men’s consciousness and autonomy over their career, education and health. This research adopted a case-study approach by using the Ministries of Education, Health, Establishment, Training and Pensions and the Civil Service Commission in Lagos State, employing a combination of qualitative and quantitative research methods as its empirical research methodology. The field work was carried out in Lagos State in the months of June and July, 2014 while the interview was in July and August, 2014. This study demonstrated that gender-blind policies disempower women and perpetuate gender inequalities in the Lagos State Civil Service. Further, it shows that the manifestation of transformatory empowerment is jeopardised by women and men's compliance with the existing expectations and inaction to bring about changes in policies and practices that are detrimental to the attainment of gender equality in the work place.

  17. Factors Influencing the Usage of Compact Fluorescent Lamps in Existing Residential Buildings in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Olusola Olugbemileke Johnson

    2012-01-01

    Full Text Available Nigeria as a developing nation is facing increasing demand for electricity especially in the residential areas. The use of compact fluorescent lamps (CFLs is one of the several measures towards reducing the demand. However, in Nigeria, the use of CFLs is low. The present study was designed to investigate some factors responsible for the low usage of CFLs in Lagos, Nigeria. Questionnaires were administered by hand on 984 households, selected through systematic random sampling techniques from 5 local government areas in Lagos State. The first building along the major street in each of the local government was selected randomly and every tenth building constituted the sample. A household head was surveyed in each of the building selected, and was asked to rate some factors that might have influenced the usage of CFLs. The data generated from the questionnaire were analysed using ranking method. The findings show that inability to measure the saving benefits of CFLs on electricity bills, lack of affordability and high initial cost of acquisition and installation were the most important factors which influence the use of the CFLs. The study concludes by providing some recommendations on how to achieve sustainable energy management in the Lagos and beyond through more efficient residential house lighting.

  18. Lago artificial de Martiánez Canarias – España

    Directory of Open Access Journals (Sweden)

    Amigó, Juan A.

    1980-06-01

    Full Text Available In this article a technical description is given of the works of the Artificial Lake of Martiánez. This work that was executed after gaining some 33,000 m2 from the sea mainly consisted of creating a small artificial lake of seawater surrounded by solariums, beaches and gardens. Inside the lake — that has an area of some 15,000 m2 — five natural islands were formed, most of which have tourist complexes built on them, consisting of: night club, restaurants, bars, terraces, etc.

    En este artículo se hace una descripción técnica de las obras del Lago Artificial de Martiánez. Esta obra, realizada tras ganar al mar unos 33.000 m2 consistió, principalmente, en la creación de un pequeño lago artificial de agua de mar rodeado de solarios, playas y jardines. En el interior del lago —cuya superficie es de unos 15.000 m2— se formaron cinco islas naturales, en la mayor de las cuales se construyó un complejo turístico que consta de: sala de fiestas, restaurantes, bares, terrazas, etc.

  19. Calidad del agua y sedimento en el lago de Maracaibo, estado Zulia

    Directory of Open Access Journals (Sweden)

    Giovany José-Bracho

    2016-03-01

    Full Text Available Se analizó el agua y el sedimento del lago de Maracaibo en seis estaciones de muestreo distribuidas de norte a sur del lago. Los parámetros físicoquímicos y ambientales fueron determinados y establecidas las relaciones entre estos y las áreas afectadas por descargas de aguas residuales, depósitos de basura, residuos industriales líquidos y sólidos, actividad petrolera y agrícola y materiales orgánicos acarreados por ríos y drenajes pluviales. Se evidenció la contaminación por incremento de utrientes(nitrógeno y fósforo en las zonas influenciadas por los ríos y vertederos de agua residual y se validó la presencia de una cuña salina por la penetración al lago de las aguas del golfo de Venezuela. Las concentraciones de metalespesados están por debajo de los límites permisibles para el agua; en los sedimentos es muy heterogénea.

  20. Oedometer Tests

    DEFF Research Database (Denmark)

    Thorsen, Grete

    1996-01-01

    The paper describes the results of oedometer tests carried out with samples from Eemian fresh-water deposits and the methods used to determine the preconsolidation pressure from the test results. The influence of creep in the material on the apparent preconsolidation pressure is estimated from a ...

  1. Exotic freshwater planarians currently known from Japan

    NARCIS (Netherlands)

    Sluys, R.; Kawakatsu, M.; Yamamoto, K.

    2010-01-01

    Biogeographical and taxonomic information on the four non-indigenous freshwater planarians of Japan is reviewed, viz. Dugesia austroasiatica Kawakatsu, 1985, Girardia tigrina (Girard, 1850), G. dorotocephala (Woodworth, 1897), and Rhodax evelinae? Marcus, 1947. The occurrence of Girardia

  2. Progress and challenges in freshwater conservation planning

    CSIR Research Space (South Africa)

    Nel, JL

    2009-06-01

    Full Text Available . Challenges relating to both improvement of scientific rigour and implementation of freshwater conservation plans are identified. High demand for water from multiple stakeholders requires planning for implementation from the outset. Three guidelines...

  3. Persistent organochlorine pesticide residues in freshwater systems ...

    African Journals Online (AJOL)

    , heptachlor and endosulfan were determined in water and sediment samples of freshwater systems in the Eastern Cape Province of South Africa that receive runoff from agricultural lands and effluents from industries. The organochlorine ...

  4. Assessment of medical waste management in seven hospitals in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Olufunsho Awodele

    2016-03-01

    Full Text Available Abstract Background Medical waste (MW can be generated in hospitals, clinics and places where diagnosis and treatment are conducted. The management of these wastes is an issue of great concern and importance in view of potential public health risks associated with such wastes. The study assessed the medical waste management practices in selected hospitals and also determined the impact of Lagos Waste Management Authority (LAWMA intervention programs. A descriptive cross-sectional survey method was used. Methods Data were collected using three instrument (questionnaire, site visitation and in –depth interview. Two public (hospital A, B and five private (hospital C, D, E, F and G which provide services for low, middle and high income earners were used. Data analysis was done with SPSS version 20. Chi-squared test was used to determine level of significance at p < 0.05. Results The majority 56 (53.3 % of the respondents were females with mean age of 35.46 (±1.66 years. The hospital surveyed, except hospital D, disposes both general and medical waste separately. All the facilities have the same process of managing their waste which is segregation, collection/on-site transportation, on-site storage and off–site transportation. Staff responsible for collecting medical waste uses mainly hand gloves as personal protective equipment. The intervention programs helped to ensure compliance and safety of the processes; all the hospitals employ the services of LAWMA for final waste disposal and treatment. Only hospital B offered on-site treatment of its waste (sharps only with an incinerator while LAWMA uses hydroclave to treat its wastes. There are no policies or guidelines in all investigated hospitals for managing waste. Conclusions An awareness of proper waste management amongst health workers has been created in most hospitals through the initiative of LAWMA. However, hospital D still mixes municipal and hazardous wastes. The treatment of waste

  5. An assessment of emotional pain among subjects with chronic dermatological problems in Lagos, Nigeria.

    Science.gov (United States)

    Owoeye, O A; Aina, O F; Omoluabi, P F; Olumide, Y M

    2007-01-01

    In dermatology, it is known that there is a significant co-morbidity between dermatological disorders and psychological complications, and it has been estimated that in at least one-third of patients with skin diseases, their effective management involves consideration of associated emotional factors. In Africa, particularly Nigeria, despite the prevalent dermatological disorders with their possible attendant mental health complications, little or no work has been done in the field of psycho-dermatology, hence the rationale for this study. A prospective study was carried out in the dermatology/venerology clinic of Lagos University Teaching Hospital (LUTH). Ethical clearance and consent were obtained to conduct the study. The subjects were selected by simple random sampling from adult patients that have had their dermatological disorders for at least six months before presentation in the clinic. Those with other co-existing chronic medical illness such as hypertension, diabetes, or haemoglobinopathy were excluded from the study. Controls were obtained to match for age and sex from apparently healthy workers in a nearby general hospital. Each subject was evaluated with a questionnaire to obtain necessary socio-demographic data: Psychache scale (PAS), and subscales C, D, and J of Symptom Check List (SCL-90). The data generated was analyzed to obtain means, and t-test was used to compare the means; p = 0.05 was taken as being significant. The analyses were done using SPSS version 10. Eighty subjects with dermatological disorders, and of equal sex distribution, were evaluated, with mean age of 33 +/- 12.1 years. Equal number of controls matched for sex and mean age of 34.6 +/- 7.3 years were also evaluated. Among the subjects, 16.3% had Acne, followed by Urticaria (13.8%), Vitiligo (12.5%), Tinea (11.3%), Hansen's disease (5%), and others (41.1%). From assessment with PAS and SCL subscales, the mean scores by the subjects were much higher than those of the controls and

  6. An evaluation of freshwater mussel toxicity data in the derivation of water quality guidance and standards for copper.

    Science.gov (United States)

    March, Ferrella A; Dwyer, F James; Augspurger, Tom; Ingersoll, Christopher G; Wang, Ning; Mebane, Christopher A

    2007-10-01

    The state of Oklahoma has designated several areas as freshwater mussel sanctuaries in an attempt to provide freshwater mussel species a degree of protection and to facilitate their reproduction. We evaluated the protection afforded freshwater mussels by the U.S. Environmental Protection Agency (U.S. EPA) hardness-based 1996 ambient copper water quality criteria, the 2007 U.S. EPA water quality criteria based on the biotic ligand model and the 2005 state of Oklahoma copper water quality standards. Both the criterion maximum concentration and criterion continuous concentration were evaluated. Published acute and chronic copper toxicity data that met American Society for Testing and Materials guidance for test acceptability were obtained for exposures conducted with glochidia or juvenile freshwater mussels. We tabulated toxicity data for glochidia and juveniles to calculate 20 species mean acute values for freshwater mussels. Generally, freshwater mussel species mean acute values were similar to those of the more sensitive species included in the U.S. EPA water quality derivation database. When added to the database of genus mean acute values used in deriving 1996 copper water quality criteria, 14 freshwater mussel genus mean acute values included 10 of the lowest 15 genus mean acute values, with three mussel species having the lowest values. Chronic exposure and sublethal effects freshwater mussel data available for four species and acute to chronic ratios were used to evaluate the criterion continuous concentration. On the basis of the freshwater mussel toxicity data used in this assessment, the hardness-based 1996 U.S. EPA water quality criteria, the 2005 Oklahoma water quality standards, and the 2007 U.S. EPA water quality criteria based on the biotic ligand model might need to be revised to afford protection to freshwater mussels.

  7. An evaluation of freshwater mussel toxicity data in the derivation of water quality guidance and standards for copper

    Science.gov (United States)

    March, F.A.; Dwyer, F.J.; Augspurger, T.; Ingersoll, C.G.; Wang, N.; Mebane, C.A.

    2007-01-01

    The state of Oklahoma has designated several areas as freshwater mussel sanctuaries in an attempt to provide freshwater mussel species a degree of protection and to facilitate their reproduction. We evaluated the protection afforded freshwater mussels by the U.S. Environmental Protection Agency (U.S. EPA) hardness-based 1996 ambient copper water quality criteria, the 2007 U.S. EPA water quality criteria based on the biotic ligand model and the 2005 state of Oklahoma copper water quality standards. Both the criterion maximum concentration and criterion continuous concentration were evaluated. Published acute and chronic copper toxicity data that met American Society for Testing and Materials guidance for test acceptability were obtained for exposures conducted with glochidia or juvenile freshwater mussels. We tabulated toxicity data for glochidia and juveniles to calculate 20 species mean acute values for freshwater mussels. Generally, freshwater mussel species mean acute values were similar to those of the more sensitive species included in the U.S. EPA water quality derivation database. When added to the database of genus mean acute values used in deriving 1996 copper water quality criteria, 14 freshwater mussel genus mean acute values included 10 of the lowest 15 genus mean acute values, with three mussel species having the lowest values. Chronic exposure and sublethal effects freshwater mussel data available for four species and acute to chronic ratios were used to evaluate the criterion continuous concentration. On the basis of the freshwater mussel toxicity data used in this assessment, the hardness-based 1996 U.S. EPA water quality criteria, the 2005 Oklahoma water quality standards, and the 2007 U.S. EPA water quality criteria based on the biotic ligand model might need to be revised to afford protection to freshwater mussels. ?? 2007 SETAC.

  8. Freshwater Commercial Bycatch: an Understated Conservation Problem

    Energy Technology Data Exchange (ETDEWEB)

    Raby, Graham D.; Colotelo, Alison HA; Blouin-Demers, Gabriel; Cooke, Steven J.

    2011-04-01

    Commercial fisheries bycatch in marine systems has been regarded as a global conservation concern by environmental groups, scientists, government, and the public for decades. Fortunately, some headway has been made to mitigate the negative impacts of bycatch in marine environments. In a survey of the literature, we found that despite freshwater commercial fisheries yields comprising 11% of the global commercial catch, bycatch research focusing on freshwater commercial fisheries represented only {approx}3% of the total bycatch literature. This paucity of research is particularly alarming given that freshwater animals and habitats are some of the world's most imperiled. The limited inland bycatch literature that does exist includes examples of population declines attributed to commercial bycatch (e.g., freshwater dolphins in the Yangtze River in China) and illustrates that in some systems bycatch can be substantial (e.g., lake trout bycatch in the Laurentian Great Lakes). Encouraging results from the marine realm can serve as models for bycatch research in freshwater, and lead to measurable gains in conservation of freshwater ecosystems. We summarize existing work on inland bycatch in an effort to draw attention to this understated and understudied conservation problem.

  9. Overwintering of sea trout (Salmo trutta) in freshwater

    DEFF Research Database (Denmark)

    Thomsen, Dennis; Koed, Anders; Nielsen, Christian

    2007-01-01

    Brown trout (Salmo trutta) show large phenotypic plasticity. Juveniles may reside in their native freshwater habitat until maturation or migrate into the ocean as 1- to 3-year-old smolts. Sea-going fish (sea trout) reside at sea for 2-3 years until migrating back to their native stream for reprod......Brown trout (Salmo trutta) show large phenotypic plasticity. Juveniles may reside in their native freshwater habitat until maturation or migrate into the ocean as 1- to 3-year-old smolts. Sea-going fish (sea trout) reside at sea for 2-3 years until migrating back to their native stream...... for reproduction. However, immature fish may leave the ocean during their first or second winter at sea and overwinter in freshwater. The question is why does this occur? We tested the hypothesis that hypo-osmoregulatory capacity is compromised by low temperature in two coastal sea trout populations, one...... representing high salinity and the other, low salinity. Immature sea-run trout were caught in lower parts of two rivers during winter and acclimated to laboratory conditions. Subgroups were challenged with high salinity or low water temperature or both, and their osmoregulatory performance was investigated...

  10. COMMUNITY DEVELOPMENT IN FRESHWATER MICROCOSMS

    Energy Technology Data Exchange (ETDEWEB)

    Rees, John T.

    1978-01-01

    Two cylindrical freshwater microcosms with a volume of 700 {ell} were maintained under controlled laboratory conditions for 190 days. The two microcosms were identical with regard to initial chemical composition and biological inocula, with the exceptions that in one microcosm (designated Tank 2) mosquitofish (Gambusia) and herbivorous catfish (Placostomas) were added. Three distinct communities developed in the tanks: (1) a phytoplankton-zooplankton assemblage and (2) two periphyton-zoobenthos communities associated with the sides and bottom of the tank, respectively. Community development and successional patterns were similar in both tanks. Major differences between the tanks involved timing of succession of the zooplankton and zoobenthos, attributable to predation by fish, principally Gambusia. A major drawback for these microcosms as use for experimental analogs such as lakes was a luxuriant periphyton growth which eventually overwhelmed the biomass of the system. The tanks displayed a degree of successional replicability, a large number of species, and a diversity of community development. Microcosms of this size could find use as experimental systems for higher level trophic manipulation and observation of life cycles not amenable to field studies.

  11. Meeting ecological and societal needs for freshwater

    Science.gov (United States)

    Baron, Jill S.; Poff, N.L.; Angermeier, P.L.; Dahm, Clifford N.; Gleick, P.H.; Hairston, N.G.; Jackson, R.B.; Johnston, C.A.; Richter, B.D.; Steinman, A.D.

    2002-01-01

    Human society has used freshwater from rivers, lakes, groundwater, and wetlands for many different urban, agricultural, and industrial activities, but in doing so has overlooked its value in supporting ecosystems. Freshwater is vital to human life and societal well-being, and thus its utilization for consumption, irrigation, and transport has long taken precedence over other commodities and services provided by freshwater ecosystems. However, there is growing recognition that functionally intact and biologically complex aquatic ecosystems provide many economically valuable services and long-term benefits to society. The short-term benefits include ecosystem goods and services, such as food supply, flood control, purification of human and industrial wastes, and habitat for plant and animal life—and these are costly, if not impossible, to replace. Long-term benefits include the sustained provision of those goods and services, as well as the adaptive capacity of aquatic ecosystems to respond to future environmental alterations, such as climate change. Thus, maintenance of the processes and properties that support freshwater ecosystem integrity should be included in debates over sustainable water resource allocation.The purpose of this report is to explain how the integrity of freshwater ecosystems depends upon adequate quantity, quality, timing, and temporal variability of water flow. Defining these requirements in a comprehensive but general manner provides a better foundation for their inclusion in current and future debates about allocation of water resources. In this way the needs of freshwater ecosystems can be legitimately recognized and addressed. We also recommend ways in which freshwater ecosystems can be protected, maintained, and restored.Freshwater ecosystem structure and function are tightly linked to the watershed or catchment of which they are a part. Because riverine networks, lakes, wetlands, and their connecting groundwaters, are literally the

  12. Title: Freshwater phytoplankton responses to global warming.

    Science.gov (United States)

    Wagner, Heiko; Fanesi, Andrea; Wilhelm, Christian

    2016-09-20

    Global warming alters species composition and function of freshwater ecosystems. However, the impact of temperature on primary productivity is not sufficiently understood and water quality models need to be improved in order to assess the quantitative and qualitative changes of aquatic communities. On the basis of experimental data, we demonstrate that the commonly used photosynthetic and water chemistry parameters alone are not sufficient for modeling phytoplankton growth under changing temperature regimes. We present some new aspects of the acclimation process with respect to temperature and how contrasting responses may be explained by a more complete physiological knowledge of the energy flow from photons to new biomass. We further suggest including additional bio-markers/traits for algal growth such as carbon allocation patterns to increase the explanatory power of such models. Although carbon allocation patterns are promising and functional cellular traits for growth prediction under different nutrient and light conditions, their predictive power still waits to be tested with respect to temperature. A great challenge for the near future will be the prediction of primary production efficiencies under the global change scenario using a uniform model for phytoplankton assemblages. Copyright © 2016 Elsevier GmbH. All rights reserved.

  13. Trophic development in a volcanic lake with closed hydric balance. Lake Martignano; Evoluzione trofica di un lago vulcanico a bilancio idrico chiuso. Il lago di Martignano

    Energy Technology Data Exchange (ETDEWEB)

    Falleni, F.; Bruno, M. [Istituto Superiore di Sanita' , Rome (Italy); Marchiori, E. [Istituto Sperimentale per la Zootecnia, Monterotondo, Rome (Italy); Congestri, R. [Rome Univ. Tor Vergata, Rome (Italy); Gasperi, E.; Brambullo, M. [Azienda Sanitaria Locale A, Rome (Italy); Amadeio, R. [Comune di Campagnano, Rome (Italy)

    2000-12-01

    Martignano lake is a particular charming volcanic lake in the countryside of Rome. Recently it was included in a project of Regional Wildlife Park. The lack of immissaries and emissaries, the quite long renewal time and the very short homeothermic period of two-months in a year, make the lake susceptible of trophic evolution. The comparison between the present data and those from previous studies seems to confirm such a slow development towards this way, with a nutrient level (nitrate 0.97 mg/L; total phosphorus 11.14 {mu}g/L) and chlorophyll a concentrations (10.68 {mu}g/L), typical of mesotrophic waters. The analysis of nutrient data expressed as annual mean value in percentage from the coastal stations, suggests an under lied farming influence, and points out the need to adopt fast reduction measures, to lower the phosphorus load in acceptable levels for the lake ecosystem. [Italian] Il lago di Martignano (207 m.s.l.m) e' situato nell'Italia centrale, a 35 Km a nord di Roma. I laghi di origine vulcanica rappresentano una tipologia relativamente rara rispetto all'insieme dei corpi d'acqua componenti la limnologia classica. La loro esistenza si determina in regioni con passata o attuale pronunciata attivita' tettonica. La mancanza di immissari ed emissari che caratterizza questo invaso rende particolarmente vulnerabile il suo livello trofico da parte delle contaminazioni da insediamenti urbani ed agricoli circostanti. Ai fini di valutare l'attuale velocita' di ricambio idrico del lago, il suo livello trofico e la conseguente capacita' di automantenimento di un basso livello trofico delle acque, e' stato pianificato il presente studio articolato in 13 mesi di campionamento. Si e' constatato che il valore medio annuale della clorofilla a, 10.68 {mu}g/L, mentre la presenza dei nitrati si aggira sul valore medio di 0.97 mg/L, cio' permette di ipotizzare l'origine agricola della maggior parte dei nutrienti del

  14. Propuesta de administración y manejo de los recursos naturales del lago de Camécuaro

    OpenAIRE

    Meza Ortiz, Octavio Herminio

    2013-01-01

    El lago de Camécuaro se localiza en el municipio de Tangancícuaro, Michoacán. Está conformado por dos tipos de ecosistemas: uno terrestre (bosque de galería) y otro acuático (lago de aguas cristalinas). Su conjunción proporcionan una belleza natural del paisaje que es importante conservar, ya que históricamente el lago es un sitio tradicional de recreo para las población de la región y pese a su limitada extensión (12.14 ha), recibe una gran afluencia turística (250,000 visitantes/año). Fue d...

  15. Age and extent of the Ilopango TBJ Tephra inferred from a Holocene chronostratigraphic reference section, Lago De Yojoa, Honduras

    Science.gov (United States)

    Mehringer, Peter J.; Sarna-Wojcicki, Andrei M.; Wollwage, Lance K.; Sheets, Payson

    2005-03-01

    Eruption of central El Salvador's Ilopango Volcano early in the first millennium A.D. caused death, cultural devastation, and exodus of southern Mesoamericans. It also left a time-stratigraphic marker in western El Salvador and adjacent Guatemala—the Ilopango Tierra Blanca Joven, or TBJ tephra. Mineral suites and major element abundances identify a silicic volcanic ash in cores from Lago de Yojoa, Honduras, as Ilopango TBJ. This extends its reported range more than 150 km to the northeast. Analyses of glass from the TBJ tephra from the Chalchuapa archaeological site, El Salvador, and from Lago de Yojoa, Honduras, establish the first major element reference fingerprint for the TBJ tephra. The Lago de Yojoa cores also hold two previously undated trachyandesitic tephra layers originating from the nearby Lake Yojoa Volcanic Field. One fell shortly before 11,000 14C yr B.P. and the other about 8600 14C yr B.P.

  16. An Assessment of Internet Uses, Practices, and Barriers for Professional Development by Agricultural Science Teachers in Lagos State

    Directory of Open Access Journals (Sweden)

    Olatomide Waheed Olowa

    2012-01-01

    Full Text Available The paper reports a study carried out on the utilisation of the Internet by agricultural science teachers in Lagos state focusing on uses, practices, and barriers. A questionnaire was developed based on literature and was administered to 300 agricultural science teachers in Lagos schools. 275 questionnaires properly completed were analyzed. Data reveal that 130 teachers are using the Internet for teaching agricultural science in classrooms as well as for various activities that enhance their professional development. Nevertheless, it was found that agricultural science teachers in Lagos State have not fully utilised the Internet because of barriers related to time factor, accessibility, and facilities. It is suggested that for the proliferation of Internet practices, there needs to be an increase in funding for technology, an introduction of computer/technology education, a provision of pedagogical training for teachers, and a provision of administrational support.

  17. Aspectos relevantes de la cuenca del lago de Valencia aplicando la metodología del pensamiento complejo

    Directory of Open Access Journals (Sweden)

    María de los Ángeles Gregori

    2014-12-01

    Full Text Available La dinámica de la cuenca del lago de Valencia situada entre los Estados Aragua y Carabobo, en la región norte costera de Venezuela está afectada por elementos climáticos, tectónicos, geomorfolóficos, la propia dinámica fluvial de los ríos que conforman la cuenca y por factores antrópicos, entre los cuales destacan el modelo de apropiación de los recursos naturales, la ocupación del territorio e incluso se pueden considerar las visiones mecanicistas y cortoplacista dadas en las "soluciones" que se implementaron para afrontar el crecimiento y decrecimiento del lago. Los principios del pensamiento complejo constituyen una estrategia metodológica para el abordaje multimensional y multiescalar sobre el estudio de la cuenca del lago Valencia.

  18. Age and extent of the Ilopango TBJ Tephra inferred from a Holocene chronostratigraphic reference section, Lago De Yojoa, Honduras

    Science.gov (United States)

    Mehringer, P.J.; Sarna-Wojcicki, A. M.; Wollwage, L.K.; Sheets, P.

    2005-01-01

    Eruption of central El Salvador's Ilopango Volcano early in the first millennium A.D. caused death, cultural devastation, and exodus of southern Mesoamericans. It also left a time-stratigraphic marker in western El Salvador and adjacent Guatemala - the Ilopango Tierra Blanca Joven, or TBJ tephra. Mineral suites and major element abundances identify a silicic volcanic ash in cores from Lago de Yojoa, Honduras, as Ilopango TBJ. This extends its reported range more than 150 km to the northeast. Analyses of glass from the TBJ tephra from the Chalchuapa archaeological site, El Salvador, and from Lago de Yojoa, Honduras, establish the first major element reference fingerprint for the TBJ tephra. The Lago de Yojoa cores also hold two previously undated trachyandesitic tephra layers originating from the nearby Lake Yojoa Volcanic Field. One fell shortly before 11,000 14C yr B.P. and the other about 8600 14C yr B.P. ?? 2004 University of Washington. All rights reserved.

  19. Modelado matemático del comportamiento mecánico de un fragmento de cartílago articular

    OpenAIRE

    LANDÍNEZ, NANCY STELLA; VANEGAS, JUAN CARLOS; GARZÓN, DIEGO ALEXANDER

    2009-01-01

    El cartílago articular es un material biológico poroelástico que permite la distribución de las cargas mecánicas y el movimiento de las articulaciones. Como material bifásico, en presencia de carga, el cartílago articular deforma su matriz sólida y modifica la presión hidrostática del fluido en su interior. El objetivo del presente trabajo es implementar numéricamente un modelo matemático que predice el comportamiento mecánico del cartílago articular teniendo en cuenta la dualidad entre la ma...

  20. DIVERSIDAD DE MURCIÉLAGOS EN CUATRO LOCALIDADES DE LA ZONA COSTANERA DEL DEPARTAMENTO DE CÓRDOBA-COLOMBIA

    Directory of Open Access Journals (Sweden)

    Jesús Ballesteros C

    2007-12-01

    Full Text Available Objetivo. Contribuir al conocimiento de la diversidad de especies de murciélagos en cuatro localidades de la subregión costanera del departamento de Córdoba. Materiales y métodos. Durante los meses noviembre y diciembre del 2005, se realizó la exploración de la comunidad de murciélagos en cuatro localidades de la zona costanera del departamento de Córdoba. Mediante la metodología de evaluación ecológica rápida (EER, se eligieron áreas con fragmentos boscosos representativos de la zona costanera, con formación vegetal característica de bosque seco tropical. Se realizaron capturas de murciélagos, utilizando redes de niebla durante dos noches seguidas en cada sitio seleccionado, con un esfuerzo de muestreo de 40 horas/red. Resultados. Se registraron 15 especies de murciélagos distribuidos en 10 géneros y 3 familias. La especie más abundante fue Artibeus jamaicensis con el 36,6% de las capturas, seguida de Sturnira lilium y Glossophaga soricina 13,8 y 10,9%, respectivamente. Se registró la presencia de la especie Desmodus rotundus (murciélago vampiro, vector del virus de la rabia bovina. Conclusiones. Los datos indicaron que aún con el alto grado de intervención humana existente en la subregión costanera, y que pese a la homogenización de la matriz del paisaje por los efectos de la ganadería extensiva, los fragmentos de bosques estudiados presentan una importante riqueza de murciélagos, que son considerados tolerantes a habitats con disturbios y de áreas abiertas, especialmente de la familia Phyllostomidae que fue la mejor representada con 12 especies.

  1. Experimental study of a sustainable hybrid system for thermoelectric generation and freshwater production

    Science.gov (United States)

    de Souza, Gabriel Fernandes; Tan, Lippong; Singh, Baljit; Ding, Lai Chet; Date, Abhijit

    2017-04-01

    The paper presents a sustainable hybrid system, which is capable of generating electricity and producing freshwater from seawater using low grade heat source. This proposed system uses low grade heat that can be supplied from solar radiation, industrial waste heat or any other waste heat sources where the temperature is less than 150°C. The concept behind this system uses the Seebeck effect for thermoelectricity generation via incorporating the low boiling point of seawater under sub-atmospheric ambient pressure. A lab-test prototype of the proposed system was built and experimentally tested in RMIT University. The prototype utilised four commercial available thermoelectric generators (Bi2Te3) and a vacuum vessel to achieve the simultaneous production of electricity and freshwater. The temperature profiles, thermoelectric powers and freshwater productions were determined at several levels of salinity to study the influence of different salt concentrations. The theoretical description of system design and experimental results were analysed and discussed in detailed. The experiment results showed that 0.75W of thermoelectricity and 404g of freshwater were produced using inputs of 150W of simulated waste heat and 500g of 3% saline water. The proposed hybrid concept has demonstrated the potential to become the future sustainable system for electricity and freshwater productions.

  2. Medication administration errors among paediatric nurses in Lagos public hospitals: an opinion survey.

    Science.gov (United States)

    Oshikoya, K A; Oreagba, I A; Ogunleye, O O; Senbanjo, I O; MacEbong, G L; Olayemi, S O

    2013-01-01

    There is paucity of data on paediatric medicine administration error (MAE) in developing countries. This study aimed to investigate the experience of MAEs among paediatric nurses working in public hospitals in Lagos, Nigeria. A confidential, self-reporting questionnaire was the instrument for the study. Public hospitals in Lagos, Nigeria with established paediatric services and departments. Paediatric nurses. The questionnaire was administered to 75 nurses working in public hospitals in Lagos to obtain information on the experience of medication errors during their entire career, as well as to know their views on the nature of MAEs and the contributing factors. Fifty nurses responded to give a response rate of 66.7%. All the participants were females with a mean ± s.d age of 35.3 ± 10.7 years. Thirty two (64%) had committed at least one medication error over the course of their career. Wrong dose error (24; 48%) and wrong timing of medicine administration (20; 40%) were the MAEs frequently committed by the participants. The consequences of the errors included shock (23; 46%), restlessness (21; 42%), disorientation (11; 22%), and respiratory depression (10; 20%). Increased workload (26; 52%) and not double checking medicine doses (12; 24%) were the major factors the nurses perceived to be contributing to MAEs. Only 15(30%) nurses had reported MAEs to their superiors. Fear of intimidation, retribution or being punished (11; 22%) and lack of policies in place to report errors (13; 26%) were the two major barriers to reporting MAEs. Half (50%) of the nurses indicated that policies were available in their work places to prevent medication errors. Medication administration errors were frequently committed by the participants and resulted in some inconsequential effects, morbidity and deaths. Appropriate measures should be implemented to prevent future occurrences of MAEs.

  3. The last 7 millennia of vegetation and climate changes at Lago di Pergusa (central Sicily, Italy

    Directory of Open Access Journals (Sweden)

    L. Sadori

    2013-08-01

    Full Text Available The aim of this study is to investigate climate changes and human activities under the lens of palynology. Based on a new high-resolution pollen sequence (PG2 from Lago di Pergusa (667 m a.s.l., central Sicily, Italy covering the last 6700 yr, we propose a reconstruction of climate and landscape changes over the recent past in central Sicily. Compared to former studies from Lago di Pergusa (Sadori and Narcisi, 2001, this work provides a reconstruction of the evolution of vegetation and climate over the last millennia in central Sicily, indeed completing previous results with new pollen data, which is particularly detailed on the last 3000 yr. Joint actions of increasing dryness, climate oscillations, and human impact shaped the landscape of this privileged site. Lago di Pergusa, besides being the main inland lake of Sicily, is very sensitive to climate change and its territory was inhabited and exploited continuously since the Palaeolithic. The lake sediments turned out to be a good observatory for natural phenomena that occurred in the last thousands of years. Results of the pollen-based study are integrated with changes in magnetic susceptibility and a tephra layer characterization. The tephra layer was shown to be related to the Sicanians' event, radiocarbon dated at 3055 ± 75 yr BP (Sadori and Narcisi, 2001. We performed palaeoclimate reconstructions by MAT (Modern Analogues Technique and WAPLS (Weighted Average Partial Least Square. Palaeoclimate reconstructions based on the core show important climate fluctuations throughout the Holocene. Climate reconstruction points out four phases of cooling and enhanced wetness in the last three millennia (2600–2000, 1650–1100, 850–550, 400–200 cal BP, corresponding to the periods between 650–50 BC, and 300–850, 1100–1400, 1550–1750 AD, respectively. This appears to be the evidence of local responses to global climate oscillations during the recent past.

  4. Recovery and recycling practices in municipal solid waste management in Lagos, Nigeria

    International Nuclear Information System (INIS)

    Kofoworola, O.F.

    2007-01-01

    The population of Lagos, the largest city in Nigeria, increased seven times from 1950 to 1980 with a current population of over 10 million inhabitants. The majority of the city's residents are poor. The residents make a heavy demand on resources and, at the same time, generate large quantities of solid waste. Approximately 4 million tonnes of municipal solid waste (MSW) is generated annually in the city, including approximately 0.5 million of untreated industrial waste. This is approximately 1.1 kg/cap/day. Efforts by the various waste management agencies set up by the state government to keep its streets and neighborhoods clean have achieved only minimal success. This is because more than half of these wastes are left uncollected from the streets and the various locations due to the inadequacy and inefficiency of the waste management system. Whilst the benefits of proper solid waste management (SWM), such as increased revenues for municipal bodies, higher productivity rate, improved sanitation standards and better health conditions, cannot be overemphasized, it is important that there is a reduction in the quantity of recoverable materials in residential and commercial waste streams to minimize the problem of MSW disposal. This paper examines the status of recovery and recycling in current waste management practice in Lagos, Nigeria. Existing recovery and recycling patterns, recovery and recycling technologies, approaches to materials recycling, and the types of materials recovered from MSW are reviewed. Based on these, strategies for improving recovery and recycling practices in the management of MSW in Lagos, Nigeria are suggested

  5. Dam failure analysis for the Lago de Matrullas Dam, Orocovis, Puerto Rico

    Science.gov (United States)

    Torres-Sierra, Heriberto; Gómez-Fragoso, Julieta

    2015-01-01

    The U.S. Geological Survey, in cooperation with the Puerto Rico Electric Power Authority, completed a hydrologic and hydraulic study to assess the potential hazard to human life and property associated with the hypothetical failure of the Lago de Matrullas Dam, located within the headwaters of the Río Grande de Manatí. The hydrologic study yielded outflow hydrographs and peak discharges for Lago de Matrullas and other subbasins in the Río Grande de Manatí hydrographic basin for three extreme rainfall events: (1) a 6-hour probable maximum precipitation (PMP) event, (2) a 24-hour PMP event, and (3) a 100-year-recurrence, 24-hour rainfall event. The hydraulic study simulated the hypothetical dam failure of Lago de Matrullas using hypothetical flood hydrographs generated from the hydrologic study and selected dam breach parameters. The flood wave resulting from the failure was downstream-routed through the lower reaches of the Río Matrullas, the Río Toro Negro, and the Río Grande de Manatí for determination of water-surface profiles developed from the event-based hydrologic scenarios and “sunny day” (no precipitation) conditions. The Hydrologic Modeling System (HEC–HMS) and the River Analysis System (HEC–RAS) computer programs, developed by the Hydrologic Engineering Center (HEC) of the U.S. Army Corps of Engineers, were used for the hydrologic and hydraulic modeling, respectively. The flow routing in the hydraulic analyses was performed using the unsteady-state flow module available in the HEC–RAS model.

  6. Electricity supply efficiency and organizational growth and profitability in Lagos, Nigeria

    Science.gov (United States)

    Adeleke, Adedeji Tajudeen

    A modern and efficient infrastructure is a basic necessity for economic development and integration into the global economy. The specific problem was the inadequate and unreliable supply of electricity to manufacturing corporations in Lagos, Nigeria. The purpose of the current quantitative correlational research study was to examine if there was a correlation between electricity supply efficiency and organizational growth and profitability in manufacturing corporations in Lagos, Nigeria. The population of the current correlational research study involved 28 out of 34 manufacturing corporations from various industrial sectors in Lagos, Nigeria, that are listed and traded on the Nigerian Stock Exchange. Spearman rho correlations were used to assess the relationships between independent variables of electricity supply efficiency levels and the dependent variables of organizational growth and profitability. The result of the correlational analysis of the data revealed that there was a statistically significant, strong positive correlation between the Average Gross Income (1998-2007) and Average Actual Electricity supply efficiency level (1998-2007), rho = 0.57; p = 0.002. A statistically significant, strong positive correlation was found between the Average Balance Sheet Size (1998-2007) and Average Actual Electricity Supply Efficiency Level (1998-2007), rho = 0.54; p = 0.003. A statistically significant, strong positive correlation between the Average Profit After Tax (1998-2007) and Average Actual Electricity Supply Efficiency Level (1998-2007), rho = 0.60; p = 0.001, was found. No statistically significant correlation between the Average Return on Investment (1998-2007) and Average Actual Electricity supply efficiency level (1998-2007), rho = 0.19; p = 0.33, was discovered.

  7. Analysis of the Re-emergence and Occurrence of Cholera in Lagos State, Nigeria

    Directory of Open Access Journals (Sweden)

    Babatimehin Oyekanmi Isaac

    2017-06-01

    Full Text Available This paper analysed the factors responsible for the re-emergence of cholera and predicted the future occurrence of Cholera in Lagos State, Nigeria using factor analysis, multiple linear regression analysis and a cellular automata model for the prediction. The study revealed six Local Government Areas (LGAs under very high threat, nine under low threat, and Surulere and some parts of Amuwo Odofin under medium threat in the near future. These areas have an average population of 200,000 people each with the total tending towards millions of people, all under threat of cholera occurring and re-emerging in their communities. The factors relating to the re-emergence of the disease were discovered to be environmental (rainfall, R2=0.017, P0.05; socio-economic (household size R2=0.816, P>0.05; income, R2=0.880, P>0.05; and education, R2=0.827, P>0.05. The Cellular Automata Markov Prediction model showed that by 2016, Lagos State will experience 79 cholera cases which will increase to 143 in 2020. This prediction model revealed that Ikorodu will record 40 cases, Apapa 12, Ojo 5, Mushin 3, while Amuwo-Odofin, Badagry and Ajeromi-Ifelodun LGAs will each record 2 cases between 2011 and 2016. The study concludes that there is a cholera threat in Lagos State and the factors of vulnerability that predispose people to the disease must be tackled over time and space for effective prevention, control and management of the disease.

  8. Holocene climate variability and anthropogenic impacts from Lago Paixban, a perennial wetland in Peten, Guatemala

    Science.gov (United States)

    Wahl, David B.; Hansen, Richard D.; Byrne, Roger; Anderson, Lysanna; Schreiner, T.

    2016-01-01

    Analyses of an ~ 6 m sediment core from Lago Paixban in Peten, Guatemala, document the complex evolution of a perennial wetland over the last 10,300 years. The basal sediment is comprised of alluvial/colluvial fill deposited in the early Holocene. The absence of pollen and gastropods in the basal sediments suggests intermittently dry conditions until ~ 9000 cal yr. BP (henceforth BP) when the basin began to hold water perennially. Lowland tropical forest taxa dominated the local vegetation at this time. A distinct band of carbonate dating to ~ 8200 BP suggests regionally dry conditions, possibly associated with the 8.2 ka event. Wetter conditions during the Holocene Thermal Maximum are indicated by evidence of a raised water level and an open water lake. The timing of this interval coincides with strengthening of the Central American Monsoon. An abrupt change at 5500 BP involved the development of a sawgrass marsh and onset of peat deposition. The lowest recorded water levels date to 5500–4500 BP. Pollen, isotope, geochemical, and sedimentological data indicate that the coring site was near the edge of the marsh during this period. A rise in the water table after 4500 BP persisted until around 3500 BP. Clay marl deposition from 3500 to 210 BP corresponds to the period of Maya settlement. An increase in δ13C, the presence of Zea pollen, and a reduction in the percentage of forest taxa pollen indicate agricultural activity at this time. In contrast to several nearby paleoenvironmental studies, proxy evidence from Lago Paixban indicates human presence through the Classic/Postclassic period transition (~ 1000 BP) and persisting until the arrival of Europeans. Cessation of human activity around 210 BP resulted in local afforestation and the re-establishment of the current sawgrass marsh at Lago Paixban.

  9. Second-hand smoke exposure among workers of restaurants, bars, and nightclubs in Lagos State

    Directory of Open Access Journals (Sweden)

    Oluwakemi Ololade Odukoya

    2017-01-01

    Full Text Available Background: The Lagos State Regulation of Smoking Law was passed in February 2014 and stipulates the total restriction of tobacco smoking in listed public places. Workers in hospitality venues are at a high risk of exposure to second-hand smoke (SHS. Therefore, their awareness of the health risks, attitudes toward SHS and their reported levels of exposure may play a crucial role in developing an effective monitoring, implementation, and enforcement mechanism. Methods: We conducted a cross-sectional, descriptive study among workers in restaurants, bars, and nightclubs registered with the Lagos State Ministry of Tourism in the second quarter of the year 2014. We used a multistage sampling technique to select one respondent each from the 300 centers randomly selected to participate in the survey. Data were collected using a modified version of the World Health Organization Global tobacco surveillance system tools. Univariate and bivariate analysis were carried out. Exposure to SHS in the workplace and in other public places was treated as the outcome variable in the bivariate analysis. Results: Majority (75.3% of the respondents were aged between 21 and 40 years with a mean age of 27.7 + 8.6 years. Many (66% were waiters/waitresses and spent more than 8 h a day. Most (60.6% of the venues were indoor only establishments, and 26.8% had no form of smoking restrictions. Majority of the respondents were exposed to SHS at work, and this was higher in bars and nightclubs. A bivariate analysis of results showed that workers were exposed to SHS at work irrespective of workplace smoking restrictions or respondents smoking status. Conclusion: Our study demonstrates that second-hand smoke exposure is very high (65% in smokers; 65.6% in nonsmokers among workers in restaurants, bars, and nightclubs in Lagos State. We are therefore of the opinion that strict enforcement of law would ensure the protection of these workers.

  10. Critical factors that impact on the efficiency of the Lagos seaports

    Directory of Open Access Journals (Sweden)

    Francis Ojadi

    2015-07-01

    Full Text Available Background: Since the past two decades, the Lagos seaports have experienced vessel and storage yard cargo congestion, resulting in dwell times of about 30 days for containerised imports and high trade logistics costs. Objectives: The purpose of this study was to identify the critical factors that impact the operational efficiency of the Lagos seaports with a view to improving liner trade activities. Method: The study adopted an operational-based approach to understand the dynamics of the various interfaces of the port value chain. The research paradigm adopted for the study was therefore a combination of constructivism and post-positivism paradigms, which entailed the exploration and understanding of the various stakeholders in the port value chain. The epistemology of the research relied on the use of the exploratory sequential mixed method research technique (i.e. the qualitative approach followed by the quantitative approach at the operational level of port operations. Results: The result of the research showed that significant challenges exist and that some of these challenges cut across all functions of port operations. Challenges are experienced in the areas of corruption, trade fraud, transport infrastructure deficits, the absence of a supply chain culture and shortcomings in the execution of the ‘contract of customs’. Additionally, these factors include the deficiencies in services and facilities provided by state agencies and government-appointed service providers and private sector companies such as truckers, inland container depots, Inland Container Depots (ICDs and terminal operators. Conclusion: Specific recommendations are made to address the issues identified which, if implemented, could significantly address the current inefficiencies observed in the Lagos seaport’s operations.

  11. Lake-level variations and tides in Lago Argentino, Patagonia: insights from pressure tide gauge records

    Directory of Open Access Journals (Sweden)

    Andreas Richter

    2015-08-01

    Full Text Available Based on precise pressure tide gauge observations lake-level records are derived for two sites in Lago Argentino, southern Patagonia, of 2.5 and 1 years of duration. Applying the tools of time series analysis, the principal processes affecting the lake level are identified and quantified. Lake-level changes reflecting variations in lake volume are dominated by a seasonal cycle of 1.2 m in amplitude. Lake-volume changes occur in addition with a daily period in response to melt water influx from surrounding glaciers. Sporadic lake-volume jumps are caused by bursting of the ice dam of Perito Moreno glacier. Water movements in Lago Argentino are dominated by surface seiches reaching 20 cm in amplitude. Lake tides reach a maximum amplitude of 3 mm. The comparison of the tidal signal extracted from the lake-level observations with a model composed of the contributions of body tide and ocean tidal loading indicates a phase shift of 23° which is most likely explained by an 1 hour phase lag of global ocean tide models in the region of the highly fragmented Pacific coast. The comparison of the obtained results with those of a previous study of Lago Fagnano, Tierra del Fuego, allows to relate differences in the hydrological and hydrodynamic processes between both lakes to morphological properties. This leads to a tentative prediction of the lake-level variability to be expected from other great Patagonian lakes. The presented geodetic results shall serve as a starting point for a detailed limnological investigation of these aquatic ecosystems.

  12. Urban malaria treatment behaviour in the context of low levels of malaria transmission in Lagos, Nigeria.

    Science.gov (United States)

    Brieger, W R; Sesay, H R; Adesina, H; Mosanya, M E; Ogunlade, P B; Ayodele, J O; Orisasona, S A

    2001-01-01

    Urban malaria in West Africa is not well documented. While rapid urbanisation may create environmental conditions that favour mosquito breeding, urban pollution may inhibit the growth of Anopheles species. In 1996, the Basic Support for Institutionalizing Child Survival (BASICS) Project of the U.S. Agency for International Development (USAID) started building urban community health coalitions in Lagos, Nigeria, to empower communities to provide prompt treatment and appropriate prevention for major causes of childhood morbidity and mortality, including malaria, diarrhoeal disease, acute respiratory infections and vaccine preventable diseases. Intervention against malaria was predicated on national policies that assumed Nigeria was holo-endemic for malaria and that prompt treatment of febrile illness with anti-malarial drugs was an appropriate action. At the suggestion and with the assistance of another USAID programme, the Environmental Health Project (EHP), BASICS embarked on a rapid assessment of the epidemiological, entomological and sociological situation of malaria transmission and case management in three Lagos communities. During April and May 1998, blood film investigation of 916 children between the ages of 6 months and 5 years yielded a parasite prevalence rate of 0.9%. Night knockdown collections of mosquitoes in rooms yielded only C. quinquefasciatus and A. aegypti. The same results were obtained for night landing collections on human bait. Very low densities of A. gambiae larvae were found in breeding sites in Lagos Island (0.7) and Ajegunle (0.3). In contrast, community members, during focus group discussion identified malaria, in it various culturally defined forms, as a major health problem. Among the children examined clinically, 186 (20.3%) reported an illness, which they called "malaria" in the previous two weeks, and 180 had sought treatment for this illness. Data obtained from 303 shops in the area documented that a minimum of US dollars 4

  13. Estudio hidroquímico e isotópico del Lago Titicaca: Informe final: Proyecto RLA/8/022

    OpenAIRE

    Rojas, Rubén; Paredes, Marco; Campos, Julio

    2002-01-01

    Con el fin de controlar y velar por la conservación y uso adecuado de los múltiples recursos del sistema, que son fundamentalmente hídrico e hidrobiológico, sin alterar negativamente la ecología de la región, los gobiernos del Perú y Bolivia solicitaron la cooperación de la Comunidad Económica Europea (CEE) para llevar a cabo los estudios correspondientes y se constituyeron como entidades contrapartes en la Autoridad Autónoma Binacional del Lago Titicaca (ALT) y el Proyecto Especial Lago Titi...

  14. Sulfate reduction in freshwater peatlands

    International Nuclear Information System (INIS)

    Oequist, M.

    1996-01-01

    This text consist of two parts: Part A is a literature review on microbial sulfate reduction with emphasis on freshwater peatlands, and part B presents the results from a study of the relative importance of sulfate reduction and methane formation for the anaerobic decomposition in a boreal peatland. The relative importance of sulfate reduction and methane production for the anaerobic decomposition was studied in a small raised bog situated in the boreal zone of southern Sweden. Depth distribution of sulfate reduction- and methane production rates were measured in peat sampled from three sites (A, B, and C) forming an minerotrophic-ombrotrophic gradient. SO 4 2- concentrations in the three profiles were of equal magnitude and ranged from 50 to 150 μM. In contrast, rates of sulfate reduction were vastly different: Maximum rates in the three profiles were obtained at a depth of ca. 20 cm below the water table. In A it was 8 μM h -1 while in B and C they were 1 and 0.05 μM h -1 , respectively. Methane production rates, however, were more uniform across the three nutrient regimes. Maximum rates in A (ca. 1.5 μg d -1 g -1 ) were found 10 cm below the water table, in B (ca. 1.0 μg d -1 g -1 ) in the vicinity of the water table, and in C (0.75 μg d -1 g -1 ) 20 cm below the water table. In all profiles both sulfate reduction and methane production rates were negligible above the water table. The areal estimates of methane production for the profiles were 22.4, 9.0 and 6.4 mmol m -2 d -1 , while the estimates for sulfate reduction were 26.4, 2.5, and 0.1 mmol m -2 d -1 , respectively. The calculated turnover times at the sites were 1.2, 14.2, and 198.7 days, respectively. The study shows that sulfate reducing bacteria are important for the anaerobic degradation in the studied peatland, especially in the minerotrophic sites, while methanogenic bacteria dominate in ombrotrophic sites Examination paper. 67 refs, 6 figs, 3 tabs

  15. Ecosystem Services : In Nordic Freshwater Management

    DEFF Research Database (Denmark)

    Magnussen, Kristin; Hasler, Berit; Zandersen, Marianne

    Human wellbeing is dependent upon and benefit from ecosystem services which are delivered by well-functioning ecosystems. Ecosystem services can be mapped and assessed consistently within an ecosystem service framework. This project aims to explore the use and usefulness of the ecosystem service...... framework in freshwater management, particularly water management according to the Water Framework Directive (WFD). There are several examples of how ecosystem services have been used in WFD related studies in all the Nordic countries. Most of them involve listing, describing and categorizing freshwater...... ecosystem services, while there are few comprehensive Cost Benefit Analyses and analyses of disproportionate costs that apply this framework. More knowledge about ecosystem services and the value of ecosystem services for freshwater systems is needed....

  16. Sulfate reduction and methanogenesis at a freshwater

    DEFF Research Database (Denmark)

    Iversen, Vibeke Margrethe Nyvang; Andersen, Martin Søgaard; Jakobsen, Rasmus

    The freshwater-seawater interface was studied in a ~9-m thick anaerobic aquifer located in marine sand and gravel with thin peat lenses. Very limited amounts of iron-oxides are present. Consequently, the dominating redox processes are sulfate reduction and methanogenesis, and the groundwater...... is enriched in dissolved sulfide, methane and bicarbonate. Under normal conditions the seawater-freshwater interface is found at a depth of 4 m at the coastline and reaches the bottom of the aquifer 40 m inland. However, occasional flooding of the area occurs, introducing sulfate to the aquifer. Groundwater...... chemistry was studied in a 120 m transect perpendicular to the coast. Cores were taken for radiotracer rate measurements of sulfate reduction and methanogenesis. In the saline part of the aquifer 35 m inland, sulfate reduction was the dominant process with rates of 0.1-10 mM/year. In the freshwater part 100...

  17. Influence of social media on business (A case study of Lagos, Nigeria)

    OpenAIRE

    Imran, Shakir

    2014-01-01

    Since the advent of social media has bring a new landscape and present a new grid of personal connections, businesses have been seeing a tremendous opportunities and are intense to draw from (social media or the trend). Many studies has been conducted stating the reasons to draw from social media and in other to help companies to gain a better position in the transition, The main reason for writing this research is to analyze the influence of social media on Lagos Nigerian businesses. Th...

  18. Trend of childhood TB case notification in Lagos, Nigeria, 2011–2014

    OpenAIRE

    Daniel, Olusoji James; Adejumo, Olusola Adedeji; Abdur-Razzaq, Husseine A.; Ebunoluwa, Jaiyesimi O.

    2015-01-01

    Background: Childhood tuberculosis (TB) has been neglected by national TB programs in sub-Saharan Africa because of the emphasis on adult smear-positive TB cases. About 80,000 HIV children die from TB, and over 550,000 childhood TB cases occur annually, representing 6% of the global TB burden, making TB an important cause of morbidity and mortality in children. Thus, this study assessed the trend of childhood TB cases notified in Lagos, Nigeria from 2011 to 2014. Methods: Retrospective da...

  19. Crisis ambiental en el lago de Chapala y el abastecimiento para Guadalajara

    OpenAIRE

    Juan M. Durán J.; Alicia Torres R

    2003-01-01

    Este artículo se centra en la crisis ambiental que genera el modelo urbano- industrial en el uso del agua por una sociedad demandante de este recurso directa o indirectamente para sus servicios, así como, por una agricultura subordinada al eje industrial que se ha generado a lo largo de la cuenca, en particular entre el lago de Chapala y Guadalajara, como resultado de las políticas y de las relaciones de poder de los actores sociales que intervienen en el uso, control y distribución ...

  20. Tratamiento no protésico de las lesiones del cartílago articular

    OpenAIRE

    Carranza Bencano, A.

    1997-01-01

    Las alteraciones del cartílago articular constituyen un gran reto planteado a la Cirugía Ortopédica actual, por el aumento de traumatismos articulares y ante el incremento del porvenir de la vida de la población con el consiguiente envejecimiento del aparato locomotor y el desarrollo de artrosis degenerativas. Los éxitos de las prótesis articulares quedan ensombrecidos por su porvenir incierto en largos períodos de seguimiento. Por ello, en este artículo se revisa la situación actual de los m...

  1. Use of Remote Sensing and Local Knowledge for Geoconservation of Regiao dos Lagos, Brazil

    Science.gov (United States)

    Avelar, S.; Vasconcelos, G.; Mansur, K. L.; Anjos, S. C.

    2013-12-01

    A series of lagoons can be found along the coastline of Rio de Janeiro, in the so-called Regiao dos Lagos. The lagoons differ in size, physicochemical, sedimentological and biological characteristics. Rare examples of litifying microbialites that produce stromatolites, the oldest fossils on Earth, can be found living in this lagoon system. The occurrence of stromatolites in the region is of great scientific interest because it enables the study of possible analogues of the earliest life on Earth. However, this region has been suffering from intense human activities and degradations. Geoconservation planning requires an assessment of the characteristics of the region and its potential threats. The primary goal of this study is to assess physical environmental changes and anthropogenic impacts over the last four decades in Regiao dos Lagos. Using a broad integrative assessment combining remote sensing, GIS, field studies and local knowledge of communities, land-cover and land-use classes were identified, as well as the main human activities impacting the environment. The seasonal and weekend tourism and urban sprawl in this coastal area of Rio de Janeiro triggers the occupation of new areas and the removal of natural vegetation, especially on lagoon margins. This disorderly occupation by an ever increasing population, with both legal and illegal constructions and the subsequent overload of the local infrastructure, e.g. increase of electrical energy consumption, volume of vehicles, pollution in air, water and soil and problems with water supply and wastewater treatment, are hastening the gradual degradation of the lake ecosystem. The main driving forces to environmental changes over the last four decades in Regiao dos Lagos were the change of dense vegetation, saline and bare soil classes into built-up areas, adding to the poor waste treatment and inadequate sewage disposal. This analysis provides a basis for a better control of anthropogenic impacts and

  2. Aislamiento de virus rábico de murciélagos en colombia, s. a.

    OpenAIRE

    Morales Alarcón, A.; Osorno-Mesa, E.; Bernal Cubides, C.; Lleras Pizarro, A.

    2012-01-01

    Se intentó el aislamiento de virus rábico en 919 murciélagos, más 83 sin clasificar que no se incluyen en el cuadro, insectívoros y frugívoros procedentes de 3 zonas de Colombia. Las especies estudiadas fueron las siguientes: Corollia perspicillata, Myotis nigricans, Lasiurus ega, Artibeus Lituratus palmarum, Vampyrops helleri, Trachops cirrhosus cirrhosus, Glossophaga longirostris, Saccopteryx bilineata, Molossus molossus, Peropteryx kappleri, Phyllostomus hastatus.  No se encontró ningún ej...

  3. Reconstituição paleoambiental do Lago Santa Ninha, Várzea do Lago Grande de Curuai, Pará, Brasil Paleoenvironmental reconstruction of an Amazon floodplain lake, Lago Santa Ninha, Varzea do Lago Grande de Curuai, Pará, Brasil

    Directory of Open Access Journals (Sweden)

    Luciane Silva Moreira

    2009-09-01

    Full Text Available Este estudo teve por objetivo reconstituir as mudanças paleoambientais e paleohidrológicas no baixo Amazonas. Um testemunho de sedimento foi coletado no Lago Santa Ninha, na várzea do Lago Grande de Curuai, localizada na margem direita do Rio Amazonas a aproximadamente 850 km da foz. O teor de água, a granulometria, as datações com carbono 14, os conteúdos de carbono orgânico e nitrogênio total e o isótopo estável do carbono (δ13C foram utilizados para determinar os processos sedimentares a que o meio esteve submetido. O testemunho estudado possui 270 cm de comprimento que corresponde a um período de 5600 anos cal AP. Este estudo colocou em evidência diferentes ambientes sedimentares: na base do testemunho até 4900 anos cal AP há uma vegetação inundada que foi gradualmente substituida por bancos de gramíneas e por uma planicie com secas sazonais em 4000 anos cal AP até alcançar, desde 600 anos AP as condições atuais deste lago. Estas alterações podem ter ocorrido em decorrência de mudanças no ciclo hidrológico do Rio Amazonas que, por sua vez, também são reflexos de alterações climáticas.Physical, chemical and geochemical characteristics of lacustrine sediments were studied to reconstruct paleohydrologyical control on sedimentation in an Amazonian floodplain. A core was collected at the Lago Grande de Curuai floodplain, in the Santa Ninha Lake, located on the right margin of the Amazon River at 850 km of the estuary. Water content, granulometry, radiocarbon dating, organic carbon, nitrogen content and δ13C were used to characterize the sedimentary processes. The core is 270 cm-long which corresponds to 5600 cal years BP. The core points out different sedimentary environments: flooded vegetation at the base of the core till 4900 cal years BP is substituted by grass banks changing to a floodplain encompassing prolonged annual dryness at 4000 cal years BP. Since 600 cal years BP, the present day Varzea Lake

  4. Algumas notas sobre o Brome Mediterrânico do Museu Regional de Lagos

    Directory of Open Access Journals (Sweden)

    Abel VIANA

    2009-10-01

    Full Text Available Reunidos durante varios anos, merce dos esforços de seu Director, que os obteve de ofertas, ou em resultado de pesquisas suas, possui o Museu Regional de Lagos numerosos objectos de certo interesse, cuja divulgaçâo ná será inútil, visto que, além de valerem como elementos de comparacáo, certos ha que constituem pecas pouco vulgares. Demais, todos eles caracterizam a arqueologia do Algarve, em especial a da regiáo do Sacrum Promunturium.

  5. Almacenamiento de carbono en especies predominantes de flora en el lago Chinchaycocha

    OpenAIRE

    Ronald Medrano Yanqui; Liz Chupan Minaya; Miguel Vila Balbín

    2012-01-01

    Objetivos: Evaluar la cantidad de carbono que almacenan las especies predominantes de flora del lago Chinchaycocha. Métodos: La investigación fue de tipo básica, de corte transversal y con un nivel exploratorio-comparativo. El estudio se hizo en tres ecosistemas dentro del humedal: bofedal, pajonal y totoral, las áreas fueron identificadas con ayuda de imágenes satelitales Landsat. El procedimiento estuvo basado en la recolección de muestras divididas en: biomasa aérea, biomasa radicular y mu...

  6. Malarone treatment failure and in vitro confirmation of resistance of Plasmodium falciparum isolate from Lagos, Nigeria.

    Science.gov (United States)

    Fivelman, Quinton L; Butcher, Geoffrey A; Adagu, Ipemida S; Warhurst, David C; Pasvol, Geoffrey

    2002-02-08

    We report the first in vitro and genetic confirmation of Malarone (GlaxoSmithKline; atovaquone and proguanil hydrochloride) resistance in Plasmodium falciparum acquired in Africa. On presenting with malaria two weeks after returning from a 4-week visit to Lagos, Nigeria without prophylaxis, a male patient was given a standard 3-day treatment course of Malarone. Twenty-eight days later the parasitaemia recrudesced. Parasites were cultured from the blood and the isolate (NGATV01) was shown to be resistant to atovaquone and the antifolate pyrimethamine. The cytochrome b gene of isolate NGATV01 showed a single mutation, Tyr268Asn which has not been seen previously.

  7. HISTORIA AMBIENTAL DE UN LAGO ALPINO EN EL CENTRO DE MÉXICO (1230-2010

    Directory of Open Access Journals (Sweden)

    Estela Cuna

    2015-01-01

    Full Text Available Los lagos de alta montaña, con una baja mineralización, alcalinidad y contenido de nutrientes, son ecosistemas sensibles a perturbaciones naturales o antropogénicas y en la actualidad están amenazados por el calentamiento global. En México existen dos lagos de alta montaña (> 3,800 m snm: La Luna y El Sol, en el cráter del Nevado de Toluca. Análisis de parámetros químicos y de diatomeas en sedimentos superficiales permiten identificar que La Luna es más ácido y menos mineralizado que El Sol y que a pesar de su proximidad geográfica cada lago tiene un conjunto de diatomeas característico, con menor abundancia y riqueza específica en La Luna. En este lago dominan Encyonema perpusillum y Psammothidium helveticum y en El Sol Cavinula pseudoscutiformis , Psammothidium levanderi y Aulacoseira distans. Con base en esta distribución se interpreta el registro de diatomeas de una secuencia sedimentaria de La Luna, de 57 cm, fechada con 210 Pb y 14 C en la que también se realizaron análisis de contenido de cladóceros y de susceptibilidad magnética. Todos estos indicadores permiten ubicar el inicio de una tendencia hacia climas secos y fríos alrededor de los años 1350 y 1510, que corresponde a la Pequeña Edad de Hielo (PEH, la cual tiene su máxima expresión entre los años 1660 y 1760, durante el mínimo de actividad solar de Maunder. Las características ambientales de sequía y frío se observan hasta principios del siglo XX. La comparación de este registro con otros disponibles permite concluir que durante la PEH hubo una tendencia regional en el centro de México hacia climas secos.

  8. CLIMA ORGANIZACIONAL Y DESEMPEÑO LABORAL DEL PERSONAL EMPRESA VIGILANTES ASOCIADOS COSTA ORIENTAL DEL LAGO

    OpenAIRE

    Niria Quintero; Nelly Africano; Elsis Faría

    2008-01-01

    Este trabajo es el resultado de un diagnóstico del clima organizacional y el desempeño laboral del personal de la empresa Vigilantes Asociados de la Costa Oriental del Lago (VADECOL). La investigación es de tipo descriptivo cuantitativo en la modalidad de campo. La población fue de 82 trabajadores y la muestra de 45 trabajadores, se utilizó la técnica de muestreo probabilística donde todas las unidades de población tuvieron la misma probabilidad de ser seleccionados. Se aplicó ...

  9. Freshwater exposure pathways in the Nordic countries

    International Nuclear Information System (INIS)

    Tveten, U.

    1984-06-01

    The report relates to a subproject under a Nordic project called ''Large reactor accidents - consequences and mitigating actions''. The report summarizes information available, primarily in the Nordic countries, on freshwater exposure pathways. Experimental and theoretical data concerning the deposition and run-off of the nuclides *sp90*Sr and*Sp137*Cs is presented. Internal exposure via drinking water and freshwater fish is dealt with, as well as external exposure due to swimming, boating, contact with fishing utensils and use of beach areas. In addition is exposure via irrigated agricultural products considered. (RF)

  10. Pathogenesis of bat rabies in a natural reservoir: Comparative susceptibility of the straw-colored fruit bat (Eidolon helvum) to three strains of Lagos bat virus.

    Science.gov (United States)

    Suu-Ire, Richard; Begeman, Lineke; Banyard, Ashley C; Breed, Andrew C; Drosten, Christian; Eggerbauer, Elisa; Freuling, Conrad M; Gibson, Louise; Goharriz, Hooman; Horton, Daniel L; Jennings, Daisy; Kuzmin, Ivan V; Marston, Denise; Ntiamoa-Baidu, Yaa; Riesle Sbarbaro, Silke; Selden, David; Wise, Emma L; Kuiken, Thijs; Fooks, Anthony R; Müller, Thomas; Wood, James L N; Cunningham, Andrew A

    2018-03-01

    Rabies is a fatal neurologic disease caused by lyssavirus infection. People are infected through contact with infected animals. The relative increase of human rabies acquired from bats calls for a better understanding of lyssavirus infections in their natural hosts. So far, there is no experimental model that mimics natural lyssavirus infection in the reservoir bat species. Lagos bat virus is a lyssavirus that is endemic in straw-colored fruit bats (Eidolon helvum) in Africa. Here we compared the susceptibility of these bats to three strains of Lagos bat virus (from Senegal, Nigeria, and Ghana) by intracranial inoculation. To allow comparison between strains, we ensured the same titer of virus was inoculated in the same location of the brain of each bat. All bats (n = 3 per strain) were infected, and developed neurological signs, and fatal meningoencephalitis with lyssavirus antigen expression in neurons. There were three main differences among the groups. First, time to death was substantially shorter in the Senegal and Ghana groups (4 to 6 days) than in the Nigeria group (8 days). Second, each virus strain produced a distinct clinical syndrome. Third, the spread of virus to peripheral tissues, tested by hemi-nested reverse transcriptase PCR, was frequent (3 of 3 bats) and widespread (8 to 10 tissues positive of 11 tissues examined) in the Ghana group, was frequent and less widespread in the Senegal group (3/3 bats, 3 to 6 tissues positive), and was rare and restricted in the Nigeria group (1/3 bats, 2 tissues positive). Centrifugal spread of virus from brain to tissue of excretion in the oral cavity is required to enable lyssavirus transmission. Therefore, the Senegal and Ghana strains seem most suitable for further pathogenesis, and for transmission, studies in the straw-colored fruit bat.

  11. Threatened and Endangered Freshwater Fish and Mussel Species Richness

    Data.gov (United States)

    U.S. Environmental Protection Agency — These data represent predicted current distributions of all US listed Threatened and Endangered freshwater fish and freshwater mussels in the Middle-Atlantic region....

  12. Status, trends, and changes in freshwater inflows to bay systems in the Corpus Christi Bay National Estuary Program study area

    Science.gov (United States)

    Asquith, W.H.; Mosier, J. G.; Bush, P.W.

    1997-01-01

    This report presents the results of a study to quantify current (1983–93) mean freshwater inflows to the six bay systems (open water and wetlands) in the Corpus Christi Bay National Estuary Program study area, to test for historical temporal trends in inflows, and to quantify historical and projected changes in inflows. The report also addresses the adequacy of existing data to estimate freshwater inflows.

  13. (ANC) patients at the Lagos state university teaching hospital

    African Journals Online (AJOL)

    STORAGESEVER

    2009-08-04

    Aug 4, 2009 ... Pearson's correlation matrices and student t-test of data were generated and P < 0.05 was considered statistically significant. RESULT. Results were compared for parity, age of patient, ges- tational age of pregnancy, booking weight, blood group and genotype, and haemoglobin status. In this study, the.

  14. Heavy metal levels in soil samples from highly industrialized Lagos ...

    African Journals Online (AJOL)

    Anyakora

    2013-09-05

    Sep 5, 2013 ... The effect of heavy metals on the environment is of serious concern and threatens life in all forms. Environmental ... have affected the quality of soil due to contamination of soil with heavy metals and the consequent effects on the ..... tested for remediation of chromium-contaminated soils. (Collen, 2003).

  15. Pattern of Urine Toxicology Screening in a Lagos Psychiatric Hospital

    African Journals Online (AJOL)

    A Total of 1555 subjects made up of males (1480) and females (75) were screened using the one step multi-6 drug test panel immunoassay for qualitative detection of Methadone, Methamphetamine, Benzodiazepine, Cocaine, Morphine and Tetrahydrocannabinol. 927 (59.6%) subjects were positive with one or more drugs ...

  16. Freshwater crayfish invasions in South Africa: past, present and ...

    African Journals Online (AJOL)

    Freshwater crayfish invasions have been studied around the world, but less so in Africa, a continent devoid of native freshwater crayfish. The present study reviews historical and current information on alien freshwater crayfish species introduced into South Africa and aims to indicate which areas are at risk from invasion.

  17. Field and model investigations of freshwater lenses in coastal aquifers

    NARCIS (Netherlands)

    Pauw, P.S.

    2015-01-01

    A major problem of sustaining freshwater supply from freshwater lens is the invasion of saline groundwater into a fresh groundwater body. In many coastal areas saltwater intrusion has led to well closure and reduced freshwater supply. Furthermore, in the future saltwater intrusion is expected to

  18. Performance Risks Allocation in Bot Infrastructure in Nigeria: A Case Study of Lagos Infrastructure Project

    Directory of Open Access Journals (Sweden)

    Sanni Gabriel A.

    2017-08-01

    Full Text Available The study assessed allocation, criteria and allotment effectiveness of performance risks in Build- Operate-Transfer (BOT transportation infrastructure in Nigeria using Lagos Infrastructure Project (LIP as a case study. LIP is the only BOT-procured tolled road that has attained ‘operate’ stage of BOT cycle in Nigeria. It revealed that more operating risks were actually allocated to the concessionaire than the grantor and most of the risks were preferred retained by the allottee. Significant fraction of the risks was effectively allocated between the concessionaire and grantor except those that involve close interface between participants. While grantor rated nine risks high and seven risks very high; the concessionaire assessed nine risks to be high and five risks to be very high; the grantor rated the effectiveness level to be seventy three per cent and the concessionaire assessed it to be sixty four per cent. The study recommended that the evolving knowledge from Lagos Infrastructure Project (LIP should be documented to guide future BOT transactions in Nigeria.

  19. A study on pharmacovigilance of herbal medicines in Lagos West Senatorial District, Nigeria.

    Science.gov (United States)

    Awodele, O; Daniel, A; Popoola, T D; Salami, E F

    2013-01-01

    There is an increasing use of herbal products and herbal medicines globally with the belief that herbal medicines are always 'safe' and carry no risk because they are from natural sources. However, there are concerns regarding medicinal plants and their ability to produce adverse effects. The growing herbal medicine usage has increased the need to monitor the safety of herbal medicines. Thus, the recommended approach by the World Health Organization (WHO) is to include herbal medicines in existing national pharmacovigilance systems. This study aimed to determine the knowledge of pharmacovigilance of herbal medicines amongst herbal medicine practitioners. The study was carried out in Lagos West Senatorial District of Lagos State, Nigeria. Three categories of practitioners (378 respondents) were engaged and they include Traditional Herbal Sellers, Natural Health Practitioners and Pharmacists. The results showed that herbal medicines are commonly recommended for malaria, typhoid, diabetes and fever. 281 (74.3%) of the respondents claimed that herbal medicines have no adverse effects and only 91 (24.1%) of the respondents said there were some adverse effects reported by the users. Adverse effects reported include nausea, diarrhoea and weight loss. Amongst those that received reports of adverse effects, only 19 (20.9%) documented these reported adverse effects; none of these documentations were forwarded to the regulatory bodies or national pharmacovigilance centre in Nigeria. These results showed inadequate adverse effects monitoring (Pharmacovigilance) amongst the practitioners and underscore the necessity to educate and enlighten herbal medicine practitioners on the need for pharmacovigilance activity of herbal products.

  20. Perception of service satisfaction and quality of life of patients living with schizophrenia in Lagos, Nigeria.

    Science.gov (United States)

    Afe, Taiwo Opekitan; Bello-Mojeed, Mashudat; Ogunsemi, Olawale

    2016-01-01

    To assess service-satisfaction and quality of life among patients with schizophrenia in a tertiary psychiatric healthcare facility in Lagos, Nigeria. Cross-sectional survey of 101 (out of 120) patients diagnosed with schizophrenia attending the outpatient clinic of the Federal Neuro-Psychiatric Hospital Yaba, Lagos, Nigeria. The Structured Clinical Interview for DSM-IV diagnosis (SCID), Charleston Psychiatric Out-patient Scale (CPOSS), and the World-Health Organisation Quality of Life -Bref scale (WHOQOL-BREF) was used in assessing diagnosis, patient satisfaction and subjective quality of life respectively. The ages of the patient ranged from 19-81. Males (49.5%) and females (50.5%) had almost equal distribution. Mean duration of attendance was 8.7years ± 8.50. Service satisfaction ranged between 25-60 on the CPOSS. Areas that had higher mean scores on CPOSS were with items (1) Helpfulness of the records clerk (3.70±1.1), (7) Helpfulness of services received (3.69±1.0). Subjective quality of life was high (3.65±1.8), satisfaction with health was also high (3.40±1.1). Service satisfaction correlated with Quality of life at P < 0.00.

  1. Neighborhood Deprivation and Self-Rated Health in Lagos State, Nigeria

    Directory of Open Access Journals (Sweden)

    Rasheed Kola Ojikutu

    2008-10-01

    Full Text Available This study examines the effect of neighborhood deprivation on the perception of the individuals about their own health in Lagos State, Nigeria. Respondents were required to rate their own health as "excellent, very good, good, fair, poor and very poor". The questionnaire contained questions on various aspect of the respondents neighborhood and their perception about them. It was found that most neighborhoods in Lagos State are deprived of basic essentials of life such as electricity, water, good roads and security. Over 43% of the respondents claimed to have visited a hospital two or more times and 43.7% had lost at least two neighbors in the past one year. Over half (57.8% of the respondents rated their own health as good, 36.6% ranked their own health as fair while only 5.6% claimed to have poor health. A fitted regression model ( r2 = 0.644 showed that variables such as number of dependants, income, occupation, type of residential accommodation, ownership of house, number of rooms occupied, mode and convenience of transportation, accessibility to water, electricity and good roads and security jointly determine the perception of an individual about his own health status.Key Words: Neighborhood, Deprivation, Self Rated Health, Security, ResidenceDOI = 10.3126/dsaj.v2i0.1364Dhaulagiri Journal of Sociology and Anthropology Vol.2 pp.193-210

  2. PATTERN OF ASSAULT-RELATED MAXILLOFACIAL INJURIES TREATED AT THE GENERAL HOSPITAL, LAGOS, NIGERIA.

    Science.gov (United States)

    Olojede, Aco; Gbotolorun, O M; Ogundana, O M; Emeka, I C; Emmanuel, M M; Oluseye, Sab; Runsewe, O

    2016-01-01

    The human face often constitutes the first point of contact in various human interactions and it is frequently the preferred target for blows in assault cases. To analyze the pattern of assault-related maxillofacial injuries treated at the General Hospital, Lagos over a period of one year. This is one year prospective study of assault-related maxillofacial injuries treated at the Department of Oral-Maxillofacial Surgery, Dental Centre, General Hospital, Lagos, Nigeria. A face-to-face interviewer-administered structured proforma was used to obtain information from study subjects. Thirty-three patients with maxillofacial injuries met the inclusion criteria for this study. Their age ranged between 16 and 48 years with a mean age of 28.2 ± 7.4 years. There were 25(75.8%) males and 8(24.2%) females with a male/female ratio of 3:1. Majority of the patients, 24(72.7%) did not have any skilled employment while the remaining 9(27.3%) were road transport workers, specifically commercial bus drivers and motorcycle riders. The most frequently seen soft tissue injury was contusion which accounted for 17(51.5%) cases while 13 (39%) of the patients sustained mandibular fracture which was the most common hard tissue injury. Assault-related maxillofacial injuries are most common amongst young adult males who are not skillfully employed; this can be attributed to the increased disposition to violence in males in our environment.

  3. Comparative Analysis of the Phytochemical Composition of Common Commercial Polyherbal Medicine in Lagos, Nigeria.

    Science.gov (United States)

    Oluwole-Banjo, A K; Faleye, E A

    2015-01-01

    There is a widespread increasing use of herbal medicine among the populace in the society. The poor regulation of herbal medicine production and use raises issues of public health concerns. To determine and compare the phytochemicals present in different classes of herbal medicines sold in Lagos, Nigeria Commonly sold brands of three classes of herbal medicine - herbal bitters, herbal energy drinks and 'Agbo' were purchased from major markets in Lagos, Nigeria. Qualitative and quantitative phytochemical analyses were carried out on the 30 samples identified The study revealed the presence of wide array of phytochemicals in all the brands and classes of herbal medicines identified. The mean concentrations of alkaloids and glycosides at 25pg/ml and 20 pg/ml were comparatively highest in 'Agbo' and herbal bitters, tannin and total phenolics of 10 pg/ml and 25pg/ml respectively were comparatively highest in herbal energy drinks. The qualitative and quantitative compositions of the phytochemicals present in the samples were identified. However, because the Recommended Daily Allowance (RDA) for phytochemicals has not been determined, people should exercise caution in the consumption of these herbal medicines because of the inherent health risk from the toxic effects of these phytochemicals.

  4. Optically stimulated luminescence dating of archaeological ceramics from Osvaldo and Lago Grande sites in central Amazon

    International Nuclear Information System (INIS)

    Hazenfratz, Roberto; Tudela, Diego R.G.; Munita, Casimiro S.; Mittani, Juan C.R.; Tatumi, Sonia H.

    2013-01-01

    Thermoluminescence (TL) and optically stimulated luminescence (OSL) dating are two important techniques for dating archaeological and geological material, especially suitable for archaeological ceramics, where samples for 14 C dating are not available. In this work, five pottery shards from Osvaldo and Lago Grande archaeological sites were dated by OSL. For measurements, it was used the SAR protocol. The annual dose rates were estimated by the contents of U, Th and K, determined by instrumental neutron activation analysis (INAA) of the pottery shards and clay samples near both sites. Lago Grande and Osvaldo represent a microcosm of the region, and their proximity and high density of archaeological record turn them interesting to study possible relations of cultural and/or commercial exchange. Calculations showed that the water content is an important variable that cannot be neglected in OSL dating of pottery shards from central Amazon, due to the high humidity in regional soils. The results between 867 ± 101 and 1154 ± 62 years AD agreed with the average time span for the archaeological sites occupation found in the literature. (author)

  5. Urbanization, housing, homelessness and climate change adaptation in Lagos, Nigeria: Lessons from Asia

    Directory of Open Access Journals (Sweden)

    Ilesanmi Adetokunbo

    2015-12-01

    Full Text Available The phenomenon of climate change heralds distinctive challenges for sub-Saharan Africa’s urban areas, with economic, social, and health impacts, and severe effects on housing and infrastructure. This study examined climate-change induced vulnerabilities including the urban housing crisis and homelessness in the context of Lagos mega-city, Nigeria, with a view to defining the potential lessons to learn from the Asian urban experience. The study conducted case-study analyses of Lagos and the Asian urban experience, highlighting the megacity-related vulnerabilities. It identified gender and aging as key factors in understanding vulnerability. Lessons from Asia relate to: the conscious policy-linkage of urban demographic expansion and economic growth; synergy between formal and informal sectors; urban densification through compact, mixed-land use development; broad-based urbanization; metropolitan expansion; pursuit of slum-free cities; prominence of housing in national policies; pro-poor financial frameworks; and extensive adoption of mitigation and adaptation strategies in the coastal conurbations. The paper concluded on the critical role of urban governance in reducing vulnerability, the need for greater multi-disciplinary stakeholders’ collaboration and partnership, and the expediency of fitting adaptation strategies and resilience responses to specific needs, capacities and priorities of impact groups. These could enhance the transformation of mega-cities into more adaptable and resilient urban systems.

  6. Sexual Violence Among Out-of-School Female Adolescents in Lagos, Nigeria

    Directory of Open Access Journals (Sweden)

    Kofoworola Odeyemi

    2016-10-01

    Full Text Available Sexual violence against females is a public health problem. This descriptive cross-sectional study sought to determine the prevalence of sexual violence among out-of-school female adolescents in Lagos, Nigeria and examine the context in which it occurs. Three hundred and fifty adolescents, between the ages of 10 and 19 years, working in Sandgrouse market, Lagos, were selected using cluster sampling. Data were collected using an interviewer-administered questionnaire. Almost half (42.9% of the respondents have had sexual intercourse, and median age at initiation was 17 years. Forced initiation was reported by 15.8%, and 36.3% reported that first intercourse was due to coercion. Among the sexually active, only 12.3% stated that “it is what they desire.” Majority of respondents (64.1% believe that rape is common in their community, and 18% of the sexually active have experienced rape. Out-of-school adolescents in this community are at risk of sexual violence. The factors that make them vulnerable need to be addressed.

  7. Subordinación local al manejo territorial globalizado de la ribera del lago de Chapala

    Directory of Open Access Journals (Sweden)

    Adriana Hernández

    2017-06-01

    Full Text Available El presente artículo aborda el proceso de reapropiación del lago de Chapala, México. En las últimas décadas se han venido transformando el suelo y la producción agrícola en los municipios ribereños del lago de Chapala debido a la introducción de cultivos de exportación mediante sistemas modernos de producción tecnificada. Por lo que los cultivos tradicionales han ido disminuyendo o se producen con mayor uso de pesticidas, fertilizantes y agroquímicos. El papel del campesino ribereño también se ha modificado debido a que las agroempresas trasnacionales generan una estructura de renta o compra de suelos y parcelas que utilizan durante un periodo de años, perdiendo el dueño el uso de sus tierras a cambio de un ingreso seguro. En el escenario ribereño actual, el campesino se transforma en receptor económico y, en ocasiones, en trabajador de sus propias tierras, sin posibilidad de decisión sobre ellas. Por lo que se encuentran en peligro los saberes locales históricos de las poblaciones ribereñas así como su cultura lacustre.

  8. Assessing smart infrastructure for sustainable urban development in the Lagos metropolis

    Directory of Open Access Journals (Sweden)

    Oluwole Soyinka

    2016-12-01

    Full Text Available The challenges of sustainable urban development increases daily and the usual planning approaches to ameliorate these challenges are ineffective. This study assesses the applicability of ‘smart infrastructure’ to achieve sustainable urban development in Lagos metropolis. The study theoretical framework is based on ‘smart’ principles. The study adopts a mixed method of data collection and analysis with multi-stage sampling techniques of 460 households in six communities of Eti-Osa and Ikeja local government areas of Lagos metropolis. The objectives of the study were to examine the socioeconomic characteristics of the residents and assess the infrastructure, the building uses and the environmental conditions of the study areas in relation to smart principles and smart infrastructure application in the study areas. The data were analyzed using inferential statistics and the findings reflect that the building use is sprawl development in nature with the informal settlement and infrastructure inadequacy as the major challenges. Smart infrastructure approaches are identified as applicable for achieving sustainable development in the study areas with smart interventions in socioeconomic status of the residents, the environment, the building uses and the basic facilities and services in the study areas.

  9. Heavy Metal Pollution Monitoring in Vulnerable Ecosystems: A Case Study of the Lagos Lagoon, Nigeria.

    Science.gov (United States)

    Bawa-Allah, K A; Saliu, J K; Otitoloju, A A

    2018-03-08

    This comparative analysis was carried out to monitor heavy metal concentrations in the Lagos Lagoon over the last 2 decades. Surface water and sediment samples were collected from stations on the Lagos Lagoon based on their suitability for comparative analysis and future monitoring. Heavy metal content in samples was determined using Flame atomic absorption spectrophotometry (FAAS). The concentrations in the samples were compared to those obtained by Don-Pedro et al. (West African Journal of Applied Ecology 5:103-114, 2004) in previous studies from the same sampling zones. Results show that concentration of most heavy metals analysed has reduced significantly (p < 0.05) in the past 2 decades. However, the concentration of Cadmium (Cd) was found to have increased significantly (p < 0.05) over the same period. Increased concentration of Cadmium poses a threat to ecosystem health thus, it is imperative that safe limits for heavy metal discharge in waste streams should be revised and implemented.

  10. Preliminary characterization of ceramics from the Lago Grande archaeological site in the central Amazon by INAA

    International Nuclear Information System (INIS)

    Hazenfratz, Roberto; Munita, Casimiro S.; Neves, Eduardo G.; Oliveira, Paulo M.S.; Toyota, Rosimeiri G.

    2009-01-01

    The macroscopic characteristics of archaeological ceramics, such as the surface decoration and shape, are used as cultural and chronological indicators of ancient people. The combination of stylistic-typological studies with archaeometric analysis, as provenance studies, has been considered of great importance in Archaeology. The purpose of this paper is to contribute to the understanding of the pre-colonial Amazonian occupations. Inside this context, fifty ceramic fragments from the Lago Grande archaeological site were analyzed by INAA in order to characterize its elemental composition. The results were treated with multivariate statistics: Cluster, Principal Components and Discriminant Analysis. The results obtained by these three methods were compared in an effort to achieve some correlation with the archaeological context. It was stated the existence of two different groups of artifacts. They probably regard to the main ceramic phases found in the site excavation: Paredao and Manacapuru. Once confirmed by other archaeological analyses, these results could corroborate an exchange net among the former inhabitants of Lago Grande and other sites in the neighborhood. (author)

  11. Addressing the Multiple Drivers of Wetland Ecosystems Degradation in Lagos, Nigeria

    Science.gov (United States)

    Agboola, J.; Ndimele, P. E.; Odunuga, S.; Akanni, A.; Kosemani, B.; Ahove, M.

    2015-12-01

    Several body of knowledge have noted the importance of wetland ecosystems in climate moderation, resource supply and flood risk reduction amongst others. Relevant as it may, rapidly increasing population and uncontrolled urban development poses a challenge in some regions and require understanding of the ecosystem components and drivers of change over a long period of time. Thus, the main thrust of this paper is to analyse multiple drivers of wetland ecosystems degradation in the last 30 years in the Lagos megacity using field study, desktop review, satellite data and laboratory analysis. Key drivers identified includes: conversion of wetlands to settlements and waste sink, land use planning that neglects wetland conservation and restoration, ineffective legal status for wetlands, over exploitation leading to degradation and fragmentation of wetland ecosystems governance. In stemming further loss of this vital ecosystem, this study adopted and proposed respectively, the Drivers, Pressure, State, Impact and Response (DPSIR) and Integrated Planning Approach (IPA) frameworks in analysing policy and governance issues in wetland development. These analyses figured out amongst others, strict conservation and sustainable use of wetland resources, habitat restoration, climate adaptation measures, legal protection and wetland management institution as major responses to current multiple pressures facing wetland ecosystems in Lagos. For these frameworks to be made meaningful, weak coordination among government agencies and institutional capacity in implementation and law enforcement, unsustainable resource extraction by private/business organization and issues on alternative sources of income on the part of the local communities amongst others needs to be addressed.

  12. Characterization of Clostridium Species from Food Commodities and Faecal Specimens in Lagos State, Nigeria.

    Science.gov (United States)

    Chukwu, E E; Ogunsola, F T; Nwaokorie, F O; Coker, A O

    2015-01-01

    Food-borne pathogens are a major public health challenge worldwide. These organisms' cause illnesses leading to time loss in the work place and reduced productivity.Clostridium species cause infections through the production of powerful toxins which are responsible for diarrhoea and cramping. Diarrhoeal diseases due to Clostridia are one of the commonest worldwide but have hardly been reported in Nigeria. This study characterized Clostridium species from food commodities and human faeces in Lagos State MATERIALS AND METHODS: Four hundred and twenty samples comprising food (220) and faecal (200) specimens in Lagos state were included in this study. Isolates obtained were identified using API 20-A and confirmed by Polymerase Chain Reaction assay and 16S rRNA sequencing. The food samples included meat and meat products, ready to drink traditionally prepared milk products, fresh vegetables, canned foods and local honey. Seventy (16.7%) Clostridium species were identified, 50 from food and 20 from faeces. Majority of the isolates were obtained from vegetables (56%) and meat products (34%). Of the 70 Clostridial species, 38 (54.3%) were C. perfringens, 5 (7.1%) were C. difficile and 2 (2.9%) were C. botulinum. All 38 (100%) strains of C. perfringens possessed alpha (cpa) toxin gene. Clostridium species are present in our environment and contaminate food products posing potential risks to consumers. There is therefore a need for these traditionally made street vended foods to be monitored because they are potential sources of food borne pathogens.

  13. Determinación de arsénico y mercurio en agua superficial del lago de Atitlán

    Directory of Open Access Journals (Sweden)

    Juan Francisco Pérez Sabino

    2015-11-01

    Full Text Available El lago de Atitlán, considerado uno de los lagos más bellos del mundo, tiene una superficie de 125.7 km2, una profundidad máxima de aproximadamente 350 m, y se encuentra en el departamento de Sololá, en el occidente de Guatemala. Desde 2009 se han observado floraciones extensivas de cianobacterias en el lago, reflejando la contaminación del agua en la cuenca. Se determinaron los niveles de arsénico (As y mercurio (Hg en agua superficial del lago de Atitlán, por espectrofotometría de absorción atómica (EAA, en cuatro muestreos realizados en marzo, mayo, agosto y octubre de 2014 en 14 sitios. Diez sitios se encuentran localizados en el lago, habiendo sido definidos en estudios anteriores con base en su cercanía a poblaciones asentadas en la orillas del lago. Dos sitios corresponden a los principales ríos tributarios, y los restantes dos sitios a la entrada y salida de la planta de tratamiento Los Cebollales, ubicada en Panajachel. Los niveles de As encontrados en el lago de Atitlán, tributarios y en la planta de tratamiento, fueron superiores a 20 μg/L. Los resultados indican que la contaminación del lago de Atitlán por As se debe principalmente a la geología de la cuenca, al localizarse en una zona volcánica. Los niveles cuantificables de As, son superiores al nivel máximo permitido para agua potable en la Norma de Agua Potable (NGO 29001:99 de la Comisión Guatemalteca de Normas (COGUANOR, por lo que el agua del lago de Atitlán no se considera apta para el consumo humano.

  14. Dominance and population structure of freshwater crabs ...

    African Journals Online (AJOL)

    1997-02-06

    Feb 6, 1997 ... CHASE, l.D. 1974. Models of hierarchy formation in animal societies. Behav. Sct. 19: 374-382. DU PREEZ, H.H., STEENKAMP, V.E. & SCHOONBEE, HJ. 1993. Bioaccumulation of zinc and lead in selected tissues and organs of the freshwater crab. PotamonQutes warreni. Sci. Tot. Environ. Suppl.: 469-478.

  15. Petroleum hydrocarbon degrading capability of freshwater ...

    African Journals Online (AJOL)

    Petroleum hydrocarbon degrading capability and growth profile of indigenous filamentous freshwater fungi from four (4) different streams were determined in vitro. The result indicated that the streams under investigation contained an average heterotrophic fungal count of 5.55 0.25x105 cfu ml-1 while the mean count of ...

  16. Wnt signaling and polarity in freshwater sponges.

    Science.gov (United States)

    Windsor Reid, Pamela J; Matveev, Eugueni; McClymont, Alexandra; Posfai, Dora; Hill, April L; Leys, Sally P

    2018-02-02

    The Wnt signaling pathway is uniquely metazoan and used in many processes during development, including the formation of polarity and body axes. In sponges, one of the earliest diverging animal groups, Wnt pathway genes have diverse expression patterns in different groups including along the anterior-posterior axis of two sponge larvae, and in the osculum and ostia of others. We studied the function of Wnt signaling and body polarity formation through expression, knockdown, and larval manipulation in several freshwater sponge species. Sponge Wnts fall into sponge-specific and sponge-class specific subfamilies of Wnt proteins. Notably Wnt genes were not found in transcriptomes of the glass sponge Aphrocallistes vastus. Wnt and its signaling genes were expressed in archaeocytes of the mesohyl throughout developing freshwater sponges. Osculum formation was enhanced by GSK3 knockdown, and Wnt antagonists inhibited both osculum development and regeneration. Using dye tracking we found that the posterior poles of freshwater sponge larvae give rise to tissue that will form the osculum following metamorphosis. Together the data indicate that while components of canonical Wnt signaling may be used in development and maintenance of osculum tissue, it is likely that Wnt signaling itself occurs between individual cells rather than whole tissues or structures in freshwater sponges.

  17. Freshwater savings from marine protein consumption

    Science.gov (United States)

    Gephart, Jessica A.; Pace, Michael L.; D'Odorico, Paolo

    2014-01-01

    Marine fisheries provide an essential source of protein for many people around the world. Unlike alternative terrestrial sources of protein, marine fish production requires little to no freshwater inputs. Consuming marine fish protein instead of terrestrial protein therefore represents freshwater savings (equivalent to an avoided water cost) and contributes to a low water footprint diet. These water savings are realized by the producers of alternative protein sources, rather than the consumers of marine protein. This study quantifies freshwater savings from marine fish consumption around the world by estimating the water footprint of replacing marine fish with terrestrial protein based on current consumption patterns. An estimated 7 600 km3 yr-1 of water is used for human food production. Replacing marine protein with terrestrial protein would require an additional 350 km3 yr-1 of water, meaning that marine protein provides current water savings of 4.6%. The importance of these freshwater savings is highly uneven around the globe, with savings ranging from as little as 0 to as much as 50%. The largest savings as a per cent of current water footprints occur in Asia, Oceania, and several coastal African nations. The greatest national water savings from marine fish protein occur in Southeast Asia and the United States. As the human population increases, future water savings from marine fish consumption will be increasingly important to food and water security and depend on sustainable harvest of capture fisheries and low water footprint growth of marine aquaculture.

  18. Herbivory on freshwater and marine macrophytes

    NARCIS (Netherlands)

    Bakker, Elisabeth S.; Wood, Kevin A.; Pagès, Jordi F.; Veen, G.F.; Christianen, Marjolijn J.A.; Santamaría, Luis; Nolet, Bart A.; Hilt, Sabine

    2016-01-01

    Until the 1990s, herbivory on aquatic vascular plants was considered to be of minor importance, and the predominant view was that freshwater and marine macrophytes did not take part in the food web: their primary fate was the detritivorous pathway. In the last 25 years, a substantial body of

  19. Dactylobiotus luci , a new freshwater tardigrade (Eutardigrada ...

    African Journals Online (AJOL)

    A new freshwater eutardigrade, Dactylobiotus luci sp. nov., is described from a permanent marsh pool (Zaphania's Pool) at 4225 m elevation in the Alpine zone of the Rwenzori Mountains, Uganda. The new species is most similar to D. dervizi Biserov, 1998 in the shape of the egg processes, absence of papillae and ...

  20. Heliozoa from Nigeria | Wujek | Tropical Freshwater Biology

    African Journals Online (AJOL)

    A total of seven scaled protistans were observed from four freshwater sites in Nigeria. They include the holiozoan genera Acanthocystis, Polyplacocystis, Pterocystis, and Raphidiophrys. All are new records for Africa. KEY WORDS: Heliozoa, Protozoa, Acanthocystis, Polyplacocystis, Pterocystis, Raphidiophrys Tropical ...

  1. Methane emission from tidal freshwater marshes

    NARCIS (Netherlands)

    Van der Nat, F.J.; Middelburg, J.J.

    2000-01-01

    In two tidal freshwater marshes, methane emission, production and accumulation in the pore-water have been studied. The two sites differ in their dominant vegetation, i.e., reed and bulrush, and in their heights above sea level. The reed site was elevated in relation to the bulrush site and had

  2. Effects of Pollution on Freshwater Invertebrates.

    Science.gov (United States)

    Buikema, A. L., Jr.; Herricks, E. E.

    1978-01-01

    Presents a literature review of the effects of pollution on freshwater invertebrates, covering publications of 1976-77. Some of the areas covered are: (1) toxicant effects on invertebrates; (2) microcosm and community effects, and (3) biological control of aquatic life. A list of 123 references is also presented. (HM)

  3. Quantal Response Of Freshwater Shrimp ( Desmocaris trispinosa ...

    African Journals Online (AJOL)

    The quantal-response of freshwater shrimp (Desmocaris trispinosa) to the toxicity of five azo dyes was studied. Generally, increase in percentage mortality of the organisms was obtained with increases in concentration of the toxicants and exposure time. The median lethal concentration50 (LC50) and median lethal ...

  4. Microplastic effect thresholds for freshwater benthic macroinvertebrates

    NARCIS (Netherlands)

    Redondo Hasselerharm, P.E.; Dede Falahudin, Dede; Peeters, E.T.H.M.; Koelmans, A.A.

    2018-01-01

    Now that microplastics have been detected in lakes, rivers and estuaries all over the globe, evaluating their effects on biota has become an urgent research priority. This is the first study that aims at determining the effect thresholds for a battery of six freshwater benthic macroinvertebrates

  5. 2008 NWFSC Tidal Freshwater Genetics Results

    Energy Technology Data Exchange (ETDEWEB)

    David Teel

    2009-05-01

    Genetic Analysis of Juvenile Chinook Salmon for inclusion in 'Ecology of Juvenile Salmon in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2008. Annual Report to Bonneville Power Administration, Contract DE-AC05-76RL01830.'

  6. Review: Freshwater conservation planning in South Africa ...

    African Journals Online (AJOL)

    Review: Freshwater conservation planning in South Africa: Milestones to date and catalysts for implementation. ... To this end we highlight 4 potential catalysts for effective implementation in the receiving environment, namely, absorptive capacity, multi-party cooperation, science extension and adaptive management.

  7. Benthic freshwater nematode community dynamics under conditions ...

    African Journals Online (AJOL)

    Studies of the influence of fish aquaculture on benthic freshwater nematode assemblages are scarce, but could provide a way of gauging environmental effects. The abundance and diversity of nematode assemblages in response to Oreochromis niloticus aquaculture were investigated in Kafr El-Sheikh Governorate, Egypt, ...

  8. Novel Synechococcus genomes reconstructed from freshwater reservoirs

    Czech Academy of Sciences Publication Activity Database

    Cabello-Yeves, P.J.; Haro-Moreno, J.M.; Martin-Cuadrado, A.B.; Ghai, Rohit; Picazo, A.; Camacho, A.; Rodriguez-Valera, F.

    2017-01-01

    Roč. 8, June (2017), č. článku 1151. ISSN 1664-302X R&D Projects: GA ČR(CZ) GA17-04828S Institutional support: RVO:60077344 Keywords : Synechococcus * picocyanobacteria * freshwater reservoirs * metagenomics * abundance Subject RIV: EE - Microbiology, Virology OBOR OECD: Microbiology Impact factor: 4.076, year: 2016

  9. Project Lifescape – Freshwater Fishes: Catfishes

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 5; Issue 4. Project Lifescape – Freshwater Fishes: Catfishes. R J Ranjit Daniels. Classroom Volume 5 Issue 4 April 2000 pp 97-107. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/reso/005/04/0097-0107 ...

  10. IDENTIFICATION OF VIBRIO BACTERIA CAUSED VIBRIOSIS ON FRESHWATER PRAWN LARVAE (Macrobrachium rosenbergii (de Man

    Directory of Open Access Journals (Sweden)

    Ni Wayan Desi Bintari

    2016-12-01

    Full Text Available Freshwater prawn (Macrobrachium rosenbergii (de Man farming in Bali needs to be supported by the provisionof healthy prawn larvae. Vibriosis infection can be a limiting factor on larval production system which cause highmass mortality in larvae. Therefore a bacteriological study is very important to identify of Vibrio species whichcan cause vibriosis in freshwater prawn larvae. Screening of Vibrio bacteria carried on larval rearing water atUPT Pembenihan Dinas Kelautan dan Perikanan Provinsi Bali which located in Pesinggahan Village, Klungkung.During study, 5 Vibrio isolates can be characterized (VSP01, VSP02, VSP04, VSP05 and VSP06 which wereisolated as dominant Vibrio bacteria in larval rearing water. Koch postulate test results showed that VSP06 cancause vibriosis in freshwater prawn larvae. The result of identification by BBL Cystal™ Identification Systems andidentification book Bergeys’s Manual of Determinative Bacteriology Ninth Edition (Holt et al., 1994, BL6 wasidentified as Vibrio anguillarum.

  11. IDENTIFICATION OF VIBRIO BACTERIA CAUSED VIBRIOSIS ON FRESHWATER PRAWN LARVAE (Macrobrachium rosenbergii (de Man

    Directory of Open Access Journals (Sweden)

    Ni Wayan Desi Bintari

    2017-02-01

    Full Text Available Freshwater prawn (Macrobrachium rosenbergii (de Man farming in Bali needs to be supported by the provisionof healthy prawn larvae. Vibriosis infection can be a limiting factor on larval production system which cause highmass mortality in larvae. Therefore a bacteriological study is very important to identify of Vibrio species whichcan cause vibriosis in freshwater prawn larvae. Screening of Vibrio bacteria carried on larval rearing water atUPT Pembenihan Dinas Kelautan dan Perikanan Provinsi Bali which located in Pesinggahan Village, Klungkung.During study, 5 Vibrio isolates can be characterized (VSP01, VSP02, VSP04, VSP05 and VSP06 which wereisolated as dominant Vibrio bacteria in larval rearing water. Koch postulate test results showed that VSP06 cancause vibriosis in freshwater prawn larvae. The result of identification by BBL Cystal™ Identification Systems andidentification book Bergeys’s Manual of Determinative Bacteriology Ninth Edition (Holt et al., 1994, BL6 wasidentified as Vibrio anguillarum.

  12. Ammonia-oxidizing Bacteria and Archaea in the Rhizosphere of Freshwater Macrophytes

    DEFF Research Database (Denmark)

    Herrmann, Martina; Schramm, Andreas

    2007-01-01

    AMMONIA-OXIDIZING ARCHAEA AND BACTERIA IN THE RHIZOSPHERE OF FRESHWATER MACROPHYTES Martina Herrmann and Andreas Schramm Department of Biological Sciences, Microbiology, University of Aarhus, Denmark Aquatic macrophytes such as Littorella uniflora and Lobelia dortmanna release oxygen from...... their roots and thereby stimulate nitrification and coupled nitrification-denitrification in their rhizosphere. However, oxygen release and inorganic nitrogen concentrations differ markedly between macrophyte species. We therefore propose (i) that the rhizosphere of freshwater macrophytes harbours a species......-specific microbial community distinct from that of unvegetated sediment and (ii) that aquatic macrophytes have an impact on abundance and activity of nitrifying and denitrifying bacteria in freshwater sediment. The goal of this study was to test these hypotheses for the key functional group for coupled nitrification-denitrification...

  13. Freshwater fish internals as a promising source of biologically active lipid complexes

    Directory of Open Access Journals (Sweden)

    Samoilovа D. A.

    2015-12-01

    Full Text Available The research on development of technology of fat extraction from freshwater fish entrails has been carried out. The study of mass composition of freshwater fish internals has shown that the highest content of fat (averaged 13,8 % is typical for internals of fish like carp, perch, silver carp, pike. The higher content is typical for silver carp (14.4 % permitting the possibility of its use as a source of lipid complexes. The chemical composition of the internal organs of researched objects has been studied; to justify the rational modes of extracting lipid complexes from freshwater fish internals the methods of extracting fat (thermal, enzymatic and low temperature have been tested. The quality indicators of raw fat have been analyzed and the conclusion on possibility of combining the ways of oil extraction in order to increase its output and improve the quality characteristics has been made

  14. Late Holocene evolution of the River Bensafrim estuary, Lagos (Portugal) - Gearchaeological remarks concerning geomorphological changings

    Science.gov (United States)

    Gomes, J. A.; Ramos-Pereira, A.; Trindade, J.

    2012-04-01

    1. The site Lagos is a city in western Algarve situated on the right margin of the Ribeira de Bensafrim. Its dissymmetric estuary has two hills: one that supports the town of Lagos and the hill of Monte Molião, known for its archaeological site. During the Late Iron Age the establishment was constrained to the top of that small hill Molião After that period, in Roman Age, people moved their location to the right river margin, founding what was then known as Laccobriga - Lagos. 2. Objectives and methodology The main objective of this study is to understand the possible causes for the abandonment of Monte Molião and what were the reasons behind the foundation of the roman city of Laccobriga? The data used were the results from the sedimentary analysis of cores in the alluvial plain of the Bensafrim valley, radiocarbon data, together with the previous excavation results and structure analysis. 3. First results: (i) In the sedimentary record, the rate sand/clay as well as several statistical parameters and shells, show different energetic environments. (ii) Radiocarbon data shows that the estuary remained open until 2800 cal BP, when a spit developed at the mouth of the estuary and a salt marsh begin to develop behind the sand barrier. (iii) Remnants of fishing activities since the Iron Age found in the archaeological site highlight different strategies for the establishment around the estuary. Archeological data tells us that, the Iron Age fishing was mainly fluvial, while later shellfish remains point that in the roman period fishing activities were made in open sea. (iv) The analyzed roman structures in the archaeological site of Monte Molião, show a clear sign of a violent seismic destruction probably related to the known 63 b.C. earthquake. 4. Conclusions (i) It is proven that in the river Bensafrim the estuary changed from an open estuary before 2800 cal BP to a closed one. This could have forced the change of the fishing habits of the populations that

  15. Evaluación de la eficiencia fotosintética del fitoplancton en un lago amazónico (Lago Boa y en un lago andino (Lago Guatavita Evaluation of the phytoplanktonic photosynthetic efficiency in an Amazon Lake (Lake Boa and in an Andean Lake (Lake Guatavita

    Directory of Open Access Journals (Sweden)

    Gabriel A. Pinilla

    2006-01-01

    Full Text Available La relación entre la fluorescencia variable y la fluorescencia máxima (Fv/Fm de las comunidades de algas se ha utilizado comúnmente como una medida de la eficiencia fotosintética del fitoplancton. Dicha eficiencia puede estar afectada por la localización de los ambientes acuáticos en distintas provincias limnológicas. En este trabajo se quiso establecer la diferencia en la relación Fv/Fm entre el lago Boa (150 msnm, Amazonía colombiana y el lago Guatavita (3000 msnm, cordillera oriental de los Andes colombianos. Los promedios de las eficiencias medidas fueron en general bajos (0,212 a 0,367 y 0,089 a 0,32 en los lagos Boa y Guatavita, respectivamente, lo que señala estrés fisiológico para las algas. La eficiencia fue mayor en aguas intermedias y presentó cambios fuertes entre épocas de muestreo y entre ecosistemas. En aguas superficiales se presentó fotoinhibición, la cual fue más fuerte en Guatavita. La eficiencia fotosintética fue menor en el lago andino debido posiblemente a diferencias climáticas, de altura sobre el nivel del mar y de estratificación. Durante los ensayos de laboratorio se observó que la eficiencia disminuyó con el tiempo, lo cual pudo deberse a una aclimatación de las algas a la oscuridad. Los datos de laboratorio confirmaron que el fitoplancton epilimnético del lago Guatavita estuvo fotoinhibido en la época de estratificación.Commonly relation between variable fluorescence and maximum fluorescence (Fv/Fm of the algae community has been utilized like a measure of the phytoplanktonic photosynthetic efficiency. Such efficiency can be affected by the water bodies' location in different limnological provinces. The goal of this work was to establish the differences in the Fv/Fm rate between Lake Boa (150 masl Colombian Amazon and Lake Guatavita (3000 masl, East Range in the Colombian Andes. In general, averages of the photosynthetic efficiencies were low (0.212 to 0.367 and 0.089 to 0.32 in lakes Boa and

  16. Expanding Access for Training of Science Teachers through ODL: A Case Study of University of Lagos, Nigeria

    Science.gov (United States)

    Okunuga, A. O.; Olaoluniyi, O.; Opara, A. I.

    2013-01-01

    Rising up to the challenge of shortage of middle manpower in Nigeria, the University of Lagos established the Correspondence and Open Studies Unit (COSU), now Distance Learning Institute DLI). Accounting, Business Administration and Science-Education were the pilot courses at the B.Sc. level. The Special Entry Preparatory Programme (SEPP) was…

  17. Mediterranean outflow pump : An alternative mechanism for the Lago-mare and the end of the Messinian Salinity Crisis

    NARCIS (Netherlands)

    Marzocchi, Alice; Flecker, Rachel; Van Baak, Christiaan G.c.; Lunt, Daniel J.; Krijgsman, Wout

    2016-01-01

    The final stage of the Messinian salinity crisis (MSC) was characterized by brackish-water “Lago-mare” conditions in the intermediate and marginal basins of the Mediterranean Sea. The presence of Paratethyan (former Black Sea) fauna in these deposits has fueled long-lasting controversies over the

  18. Home and School Environments as Determinant of Social Skills Deficit among Learners with Intellectual Disability in Lagos State

    Science.gov (United States)

    Isawumi, Oyeyinka David; Oyundoyin, John Olusegun

    2016-01-01

    The study examined home and school environmental factors as determinant of social skills deficit among learners with intellectual disability in Lagos State, Nigeria. The study adopted survey research method using a sample size of fifty (50) pupils with intellectual disability who were purposively selected from five special primary schools in Lagos…

  19. The Relevance of Multi Media Skills in Teaching and Learning of Scientific Concepts in Secondary Schools in Lagos State, Nigeria

    Science.gov (United States)

    Okedeyi, Abiodun S.; Oginni, Aderonke M.; Adegorite, Solomon O.; Saibu, Sakibu O.

    2015-01-01

    This study investigated the relevance of multi media skills in teaching and learning of scientific concepts in secondary schools. Self constructed questionnaire was administered to 120 students randomly selected in four secondary schools in Ojo Local Government Area of Lagos state. Data generated were analyzed using chi-square statistical…

  20. New Prof Omeje Pornography Addiction as Correlate of Psychosocial and Academic Adjustment of Students in Universities in Lagos State

    Science.gov (United States)

    Ohuakanwa, Chijioke Ephraim; Omeje, Joachim Chinweike; Eskay, Michael

    2012-01-01

    The study sought to investigate the relationship between pornography addiction and psychosocial and academic adjustment of students in universities in Lagos State. In order to achieve this objective, five research questions were formulated and two hypotheses postulated. The subjects for the study consisted of 616 full-time third-year undergraduate…

  1. Evaluation of Colilert-18 for Detection of Coliforms and Eschericha coli in Subtropical Freshwater

    Science.gov (United States)

    Chao, Kuo-Kuang; Chao, Chen-Ching; Chao, Wei-Liang

    2004-01-01

    The accuracy of Colilert-18 as a test for coliforms and Escherichia coli in subtropical freshwater was evaluated by using API 20E strips and fatty acid methyl ester analysis. The false-positive and -negative rates of detection were 7.4 and 3.5%, respectively, for E. coli and 9.6 and 6.3%, respectively, for coliforms. PMID:14766614

  2. Prevalence of Foodborne Pathogens in Freshwater Fish in Latvia.

    Science.gov (United States)

    Terentjeva, Margarita; Eizenberga, Inga; Valciņa, Olga; Novoslavskij, Aleksandr; Strazdiņa, Vita; Bērziņš, Aivars

    2015-11-01

    The aim of this study was to detect the prevalence of Salmonella spp., Listeria monocytogenes, and Yersinia enterocolitica in freshwater fish in Latvia. In total, 235 samples, including freshly caught fish from fives lakes (n = 129) and fish from retail markets (n = 106), were collected from April 2014 to December 2014 in Latvia. Samples were tested according to International Organization for Standardization methods. No Salmonella spp. were found in fresh fish from lakes or in commercially available fish. In contrast, the overall prevalence of L. monocytogenes and Y. enterocolitica in freshwater fish was 13% (30 of 235) and 14% (34 of 235), respectively, and no significant difference between the prevalence of L. monocytogenes and Y. enterocolitica was observed (P > 0.05). All Y. enterocolitica isolates belonged to the nonpathogenic 1A biotype. Molecular serotyping of L. monocytogenes revealed that the most distributed serogroup was 1/2a-3a (65%), followed by 1/2c-3c (25%), 1/2b-3b (5%), and 4b, 4d, 4e (5%). The prevalence of L. monocytogenes and Y. enterocolitica in freshwater lake fish was 2% (2 of 129) and 3% (4 of 129), respectively. In contrast, the prevalence of L. monocytogenes and Y. enterocolitica in fish at retail markets was 26% (28 of 106) and 28% (30 of 106), respectively. In retail samples, 9 of 58 positive fish contained both L. monocytogenes and Y. enterocolitica. In general, differences in the prevalences of L. monocytogenes and Y. enterocolitica in retail samples were significantly higher than those in freshly caught fish (P Latvia.

  3. Contaminants in the Greenland terrestrial and freshwater environment. National assessment

    International Nuclear Information System (INIS)

    Riget, F.; Aastrup, P.; Dietz, R.

    1997-01-01

    The present report reviews the available information on heavy metals, persistent organic pollutants and radioactivity in the Greenland freshwater and terrestrial environments. Levels in lake sediments, soil, humus and organisms are presented, spatial and temporal trends are discussed and where possible also biological effects. Many of the contaminants that occur in the Greenland environment originate from distant sources outside of the region, and are transported to the Arctic via three major pathways - atmospheric, terrestrial/freshwater and marine. The main sources of pollution in Greenland is considered to be the industrialization of Eurasia. Pollutants are mainly. The organochlorine levels in Greenland char are typically in the low range compared to values reported from Canada. The Greenland sediment samples showed all organochlorine values below the detection limits of 0.1 μg/kg dry weight, thus being among the lowest contaminated sediments within the Arctic. The total content of PAH in the Greenland sediment samples ranged between 78-635 μ3 g/kg dry wight, with a geometric mean of 178 μg/kg, comparable to or lower than reported values from other arctic countries. The lowest concentrations of anthropogenic radionuclides in the Greenland terrestrial and freshwater environment are found in the northern parts of Greenland and the highest in the south western parts. The main source of anthropogenic radioactivity is nuclear weapons testing in the atmosphere and the fallout from this activity is closely related to the amounts of precipitation. The predominant foodchain in the Arctic with regard to transport of radiocaesium to man is: Lichen-reindeer-man. Although the doses from the terrestrial foodchain are 20 times higher than those received from the marine foodchain, they are not considered to be of any relevance for the human health in Greenland. 4 appendices contain experimental results. (EG)

  4. Murciélagos del área urbana en la ciudad de Montería, Córdoba - Colombia

    OpenAIRE

    Jesús Ballesteros C.; Javier Racero-Casarrubia

    2012-01-01

    RESUMENObjetivo. Conocer la riqueza de especies de murciélagos del área urbana de la ciudad de Montería. Materiales y métodos. Durante el período de enero a junio de 2007, se realizaron capturas de murciélagos utilizando cinco redes de nieblas (12x2 m). Se realizaron trece muestreos en varios sitios de la ciudad, abriendo las redes desde las 18:00 a las 24:00 horas, con un esfuerzo de 524 horas-red/noche. Resultados. De 604 individuos capturados se identificaron 24 especies de murciélagos. La...

  5. Estudios experimentales de los efectos mecánicos sobre la biología del cartílago de crecimiento

    OpenAIRE

    Arriola, Forriol, F. F.

    1998-01-01

    El cartílago de crecimiento es la estructura encargada del crecimiento en longitud de los huesos largos. En el hombre los diferentes cartílagos de crecimiento cumplen su función durante un tiempo determinado hasta desaparecer. Cada cartílago de crecimiento tiene una velocidad de crecimiento y un tiempo de evolución determinado por factores que nos resultan desconocidos si bien se sabe que son tanto sistémicos como mecánicos. En este trabajo se presenta una revisión de trabajos experimental...

  6. Sistema de humedales artificiales para el control de la eutroficación del lago del Bosque de San Juan de Aragón

    OpenAIRE

    Luna-Pabello, Víctor Manuel; Aburto-Castañeda, Sergio

    2014-01-01

    El lago del Bosque de San Juan de Aragón (LBSJA), ocupa una superficie de 12 hectáreas. El lago está eutrofizado debido a que el sistema de lodos activados, conocido como "Tlacos", descarga parcialmente agua tratada dentro del lago y ésta contiene concentraciones de nitrógeno y fósforo que propician el crecimiento de microalgas. En este estudio, se describen los aspectos relevantes sobre el diseño, construcción y arranque operativo de un sistema de tratamiento a base de humedales artificiales...

  7. Freshwater flux to Sermilik Fjord, SE Greenland

    Directory of Open Access Journals (Sweden)

    S. H. Mernild

    2010-10-01

    Full Text Available Terrestrial inputs of freshwater flux to Sermilik Fjord, SE Greenland, were estimated, indicating ice discharge to be the dominant source of freshwater. A freshwater flux of 40.4 ± 4.9×109 m3 y−1 was found (1999–2008, with an 85% contribution originated from ice discharge (65% alone from Helheim Glacier, 11% from terrestrial surface runoff (from melt water and rain, 3% from precipitation at the fjord surface area, and 1% from subglacial geothermal and frictional melting due to basal ice motion. The results demonstrate the dominance of ice discharge as a primary mechanism for delivering freshwater to Sermilik Fjord. Time series of ice discharge for Helheim Glacier, Midgård Glacier, and Fenris Glacier were calculated from satellite-derived average surface velocity, glacier width, and estimated ice thickness, and fluctuations in terrestrial surface freshwater runoff were simulated based on observed meteorological data. These simulations were compared and bias corrected against independent glacier catchment runoff observations. Modeled runoff to Sermilik Fjord was variable, ranging from 2.9 ± 0.4×109 m3 y−1 in 1999 to 5.9 ± 0.9×109 m3 y−1 in 2005. The sub-catchment runoff of the Helheim Glacier region accounted for 25% of the total runoff to Sermilik Fjord. The runoff distribution from the different sub-catchments suggested a strong influence from the spatial variation in glacier coverage, indicating high runoff volumes, where glacier cover was present at low elevations.

  8. Utilization of insecticide treated nets (ITNs among male students of a tertiary institution in Lagos State, Nigeria

    Directory of Open Access Journals (Sweden)

    Abdul-Hakeem Olatunji Abiola

    2014-01-01

    Full Text Available Background: Malaria is an eminently preventable, treatable and curable disease. Proven effective options to reduce morbidity and mortality include early diagnosis, combined with prompt effective therapy and malaria prevention through reduction of human-vector contact, emphasizing the use of insecticide-treated nets (ITNs. The aim of this study was to determine the knowledge, attitude and utilization of malaria preventive methods among the students residing in Mariere Hostel of the University of Lagos, Akoka. Materials and Methods: The study design was a cross-sectional descriptive study. Simple random sampling method was used to select the respondents. Pre-tested, structured, open and close-ended self administered questionnaires were used for data collection. Data analysis was done using Epi info version 3.5.1 statistical software package. The study was carried out in February 2012. Results: A total of 221 out of the administered 250 questionnaires were retrieved and analyzed giving a response rate of 88.4%. All the respondents were males with a mean age of 20 ± 2.8 years. The mean knowledge score (% of the respondents was 76.5 ± 3.19. Although, 91.0% of the respondents recommended the use of ITNs to all students, only 31.6% use ITNs. The major reason given for non-usage of ITNs being that it is uncomfortable (45.3%. There was no statistically significant relationship between socio-demographic characteristics and utilization of ITN. Conclusion: This study has demonstrated high level of knowledge of malaria and positive attitude towards malaria prevention but poor malaria prevention practice as evidenced by poor usage of insecticide-treated nets. There is therefore need for more enlightenment campaigns to improve and sustain the knowledge and attitude towards malaria prevention as well as improve utilization of ITNs.

  9. Municipal household solid waste collection strategies in an African megacity: analysis of public private partnership performance in Lagos.

    Science.gov (United States)

    Aliu, Ibrahim Rotimi; Adeyemi, Oluwagbemiga Ezekiel; Adebayo, Adeolu

    2014-09-01

    Managing municipal solid waste is a pervasive urban problem globally. While several strategies have been applied for efficient municipal solid waste management in developing economies, their performance level has not been critically investigated. Among these strategies, the public private partnership has widest appeal. This study examines the performance of public private partnership in household solid waste collection in Lagos, Nigeria. We collected primary data using a municipal solid waste survey in three residential density areas of Lagos megacity. Descriptive and inferential statistics were used to analyse the data. Two indexes of service performance, namely the service reliability index and operational quality index, were created to produce evidence on public private partnership performance in municipal solid waste collection in Lagos. Results show that the average amount of household solid waste generation per week ranges between 22.75 kg in the medium residential density area and 30.39 kg in the high residential density region of the city. The estimated per capita waste generated in Lagos Megacity is 0.95 kg day(-1). Regression models indicate that the public private partnership performance is significantly influenced by economic status, affordability, flexibility, consistency, cleanliness, coverage and accessibility, as well as number of waste collection vehicles, vehicle maintenance, capacity, trip rate, frequency, number of personnel and quality of personnel. Findings from this study reveal that Lagos residents have strong positive perception of public private partnership as a waste collection policy framework. The study has important policy and practical implications for urban waste management, public health and sustainability in developing economies. © The Author(s) 2014.

  10. MODELADO MATEMÁTICO DEL COMPORTAMIENTO MECÁNICO DE UN FRAGMENTO DE CARTÍLAGO ARTICULAR

    Directory of Open Access Journals (Sweden)

    NANCY STELLA LANDÍNEZ

    2009-01-01

    Full Text Available El cartílago articular es un material biológico poroelástico que permite la distribución de las cargas mecánicas y el movimiento de las articulaciones. Como material bifásico, en presencia de carga, el cartílago articular deforma su matriz sólida y modifica la presión hidrostática del fluido en su interior. El objetivo del presente trabajo es implementar numéricamente un modelo matemático que predice el comportamiento mecánico del cartílago articular teniendo en cuenta la dualidad entre la matriz sólida y el líquido articular, y la característica de poroelasticidad. Utilizando una metodología basada en el método de los elementos finitos, se simuló el comportamiento de un fragmento de cartílago articular en una y dos dimensiones, ante cargas mecánicas de tensión, compresión y oscilación. El análisis de los resultados permite validar cualitativamente el comportamiento poroelástico del modelo debido a la deformación de la matriz sólida y a la salida de fluido que modifica la presión del mismo de manera similar a lo reportado en trabajos experimentales. Se concluye que el modelo matemático permite realizar predicciones sobre el comportamiento biomecánico del cartílago articular, contribuyendo al proceso investigativo en áreas como la biomecánica y la ingeniería de tejidos.

  11. Acute toxicity of pesticides to the tropical freshwater shrimp Caridina laevis.

    Science.gov (United States)

    Sucahyo, David; van Straalen, Nico M; Krave, Agna; van Gestel, Cornelis A M

    2008-03-01

    To determine the potential risk of pesticides frequently used in Indonesia, a new toxicity test was developed using the indigenous freshwater shrimp Caridina laevis, which is representative of tropical ecosystems. The test species could easily be maintained in the laboratory. Acute toxicity tests with different insecticides, fungicides, and herbicides assessing adult survival after 24 and 96 h of static exposure showed low control mortality (<10%) and good reproducibility for diazinon. Juvenile C. laevis appeared approximately two to three times more sensitive to diazinon than adult ones. Compared to other species of freshwater crustacean commonly used in standard aquatic toxicity tests, C. laevis showed similar sensitivity for diazinon and lambda cyhalothrin, much greater sensitivity for endosulfan and paraquat and much lower sensitivity for carbofuran. It may be concluded that the acute toxicity test using C. laevis may be a suitable alternative for determining the potential risk of chemicals under tropical conditions.

  12. Sedimentation survey of Lago La Plata, Toa Alta, Puerto Rico, March–April 2015

    Science.gov (United States)

    Gómez-Fragoso, Julieta

    2016-10-31

    IntroductionLago La Plata is operated by the Puerto Rico Aqueduct and Sewer Authority (PRASA) and is part of the San Juan Metropolitan Water District. The reservoir serves a population of about 425,000 people. During 2013 the reservoir provided 0.307 million cubic meters (Mm3 ) of water per day (about 81 million gallons per day), which is equivalent to 31 percent of the total water demand for the metropolitan area (Wanda L. Molina, U.S. Geological Survey, written commun., 2015). The dam was constructed in 1974 and is located about 5 kilometers (km) south of the town of Toa Alta and 5 km north of the town of Naranjito (fig. 1). The drainage area upstream from the Lago La Plata dam is about 469 square kilometers (km2 ). The storage capacity at construction in 1974 was 26.84 Mm3 with a spillway elevation of 47.12 meters (m) above mean sea level (msl). Storage capacity was increased to 40.21 Mm3 in 1989 after the installation of bascule gates to provide a normal dam pool elevation at 52 m above msl (Puerto Rico Electric and Power Authority, 1979). The maximum height of the dam is about 40 m above the river bottom near the dam, and the intake structure consists of six 1.82-m-diameter ports facing upstream, with 6-m vertical spacing that begins at an elevation of 19 m above msl. The U.S. Geological Survey (USGS), in cooperation with the PRASA, conducted a bathymetric survey of the Lago La Plata reservoir during March and April 2015. The hydrographic survey was designed to provide an update of the reservoir storage capacity and sedimentation rate. Areas with substantial sediment accumulation are also discussed in this report. The results of the survey were used to prepare a bathymetric map showing the reservoir bottom (fig. 2) referenced with respect to the spillway elevation. This report also includes a summary of a previous bathymetric survey conducted in 2006 (Soler-López, 2008).

  13. Toxicity of Metals to a Freshwater Ostracod: Stenocypris major

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    Mohammad Shuhaimi-Othman

    2011-01-01

    Full Text Available Adults of freshwater ostracod Stenocypris major (Crustacea, Candonidae were exposed for a four-day period in laboratory conditions to a range of copper (Cu, cadmium (Cd, zinc (Zn, lead (Pb, nickel (Ni, iron (Fe, aluminium (Al, and manganese (Mn concentrations. Mortality was assessed, and median lethal times (LT50 and concentrations (LC50 were calculated. LT50 and LC50 increased with the decrease in mean exposure concentrations and times, respectively, for all metals. LC50s for 96 hours for Cu, Cd, Zn, Pb, Ni, Fe, Al, and Mn were 25.2, 13.1, 1189.8, 526.2, 19743.7, 278.9, 3101.9, and 510.2 μg/L, respectively. Metals bioconcentration in S. major increases with exposure to increasing concentrations, and Cd was the most toxic to S. major, followed by Cu, Fe, Mn, Pb, Zn, Al, and Ni (Cd>Cu>Fe>Mn>Pb>Zn>Al>Ni. Comparison of LC50 values for metals for this species with those for other freshwater crustacean reveals that S. major is equally or more sensitive to metals than most other tested crustacean.

  14. Temporal Variability of Microplastic Concentrations in Freshwater Streams

    Science.gov (United States)

    Watkins, L.; Walter, M. T.

    2016-12-01

    Plastic pollution, specifically the size fraction less than 5mm known as microplastics, is an emerging contaminant in waterways worldwide. The ability of microplastics to adsorb and transport contaminants and microbes, as well as be ingested by organisms, makes them a concern in both freshwater and marine ecosystems. Recent efforts to determine the extent of microplastic pollution are increasingly focused on freshwater systems, but most studies have reported concentrations at a single time-point; few have begun to uncover how plastic concentrations in riverine systems may change through time. We hypothesize the time of day and season of sampling influences the concentrations of microplastics in water samples and more specifically, that daytime stormflow samples contain the highest microplastic concentrations due to maximized runoff and wastewater discharge. In order to test this hypothesis, we sampled in two similar streams in Ithaca, New York using a 333µm mesh net deployed within the thalweg. Repeat samples were collected to identify diurnal patterns as well as monthly variation. Samples were processed in the laboratory following the NOAA wet peroxide oxidation protocol. This work improves our ability to interpret existing single-time-point survey results by providing information on how microplastic concentrations change over time and whether concentrations in existing stream studies are likely representative of their location. Additionally, these results will inform future studies by providing insight into representative sample timing and capturing temporal trends for the purposes of modeling and of developing regulations for microplastic pollution.

  15. Ecotoxicological assessment of the pharmaceutical compound Triclosan to freshwater invertebrates with emphasis to spiked sediment tests; Avaliacao ecotoxicologica do farmaco Triclosan para invertebrados de agua doce com enfase em ensaios com sedimento marcado ('spiked sediment')

    Energy Technology Data Exchange (ETDEWEB)

    Pusceddu, Fabio Hermes

    2009-07-01

    The increasing of Pharmaceutical and Personal Care Products (PPCPs) occurrence in the aquatic environment cause adverse effects on the human health and aquatic communities. The environmental risk of the PPCPs associated with the possibility of synergic effects between PCPPs and the increase of the use of synthetic organic compounds, unchained a great concern on the toxic potential to biota aquatic. Triclosan (5-chloro-2-(2,4-dichlorophenoxy)-phenol) is a pharmaceutical compound widely used due your antibacterial mechanism effect, found in at least 932 products such as shampoos, toilet soaps, deodorants, lotions, toothpaste, detergents, socks and underwear, among others. Currently, studies about the Triclosan toxicity in the water and, mainly in the sediment, are poorly. We have the knowledge that the photodegradation of this product results into dichlorodibenzo-p-dioxin, and now it has great discussion on environmental agencies, like EPA, about the release or restriction of this product. The aim of this work is to assess the effects of Triclosan on mortality of insect larvae Chironomus xanthus and mortality and reproduction inhibition of microcrustacea Ceriodaphnia dubia exposed to Triclosan spiked sediments based on standard methods EPA and OECD. The EC50;96H obtained on acute toxicity tests with C. xanthus was 45,26 mg.Kg{sup -1}. The chronic toxicity tests with C. dubia using spiked sediments were performed following the procedure in Burton and MacPherson (1995). A no-observed-effect concentrations and lowest-observed-effect concentration were 5,78 e 6,94 mg.Kg{sup -1}, respectively. (author)

  16. Luminescence properties of a nanoporous freshwater diatom.

    Science.gov (United States)

    Goswami, Bondita; Choudhury, Amarjyoti; Buragohain, Alak K

    2012-01-01

    Freshwater diatom frustules show special optical properties. In this paper we observed luminescence properties of the freshwater diatom Cyclotella meneghiniana. To confirm the morphological properties we present scanning electron microscopy (SEM) images. X-ray diffraction (XRD) studies were carried out to visualize the structural properties of the frustules, confirming that silica present in diatom frustules crystallizes in an α-quartz structure. Study of the optical properties of the silica frustules of diatoms using ultra-violet-visible (UV-vis) spectroscopy and photoluminescence spectroscopy confirmed that the diatom C. meneghiniana shows luminescence in the blue region of the electromagnetic spectrum when irradiated with UV light. This property of diatoms can be exploited to obtain many applications in day-to-day life. Also, using time-resolved photoluminescence spectroscopy (TRPL) it was confirmed that this species of diatom shows bi-exponential decay. Copyright © 2011 John Wiley & Sons, Ltd.

  17. Freshwater fishes of Tsitsikamma National Park

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    I.A. Russell

    2002-12-01

    Full Text Available This study aimed to determine the distribution and relative abundance of freshwater fishes in the Tsitsikamma National Park. Fish assemblages in six river systems were sampled in 2001, with a total of 323 fish from eight species recorded. Indigenous fish collected included four freshwater species (Pseudobarbus afer, Pseudobarbus tenuis, Sandelia capensis, Anguilla mossambica, three estuarine species (Monodactylus falciformis, Caffrogobius gilchristi, Myxus capensis, and one alien (Micropterus salmoides. One additional indigenous species (Galaxias zebratus and two aliens (Salmo trutta, Oncorhynchus mykiss could potentially occur within the park. The topography and locality of the park presents a unique opportunity to meaningfully conserve the endangered P. tenuis as well as other fish characteristic of the eastern reaches of the Cape Floristic Region. Management action is required to minimise opportunities for further establishment and spread of alien fish species and to conserve indigenous fish assemblages within the park.

  18. Assessing the freshwater distribution of yellow eel

    Directory of Open Access Journals (Sweden)

    Lasne É.

    2009-04-01

    Full Text Available In the global context of the decline in wild species, modeling the distribution of populations is a crucial aspect of ecological management. This can be a major challenge, especially for species, such as the European eel, that have complex life cycles, exhibit cryptic behavior, or migrate over long distances. A review of the literature suggests that eel size data could be used to assess and analyze freshwater distribution of eel. We argue that analyses based on small yellow eels (≤ 300 mm along the longitudinal course of rivers could provide a valuable tool for population monitoring. We propose a standardized catchment recruitment index and a colonization index based on the probability of occurrence (presence/absence data using logistic models for different size classes. The model developed here provides a convenient guide for assessing yellow eel stages in freshwater areas, and should have concrete applications for management of the species.

  19. Crisis ambiental en el lago de Chapala y el abastecimiento para Guadalajara

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    Juan M. Durán J.

    2003-01-01

    Full Text Available Este artículo se centra en la crisis ambiental que genera el modelo urbano- industrial en el uso del agua por una sociedad demandante de este recurso directa o indirectamente para sus servicios, así como, por una agricultura subordinada al eje industrial que se ha generado a lo largo de la cuenca, en particular entre el lago de Chapala y Guadalajara, como resultado de las políticas y de las relaciones de poder de los actores sociales que intervienen en el uso, control y distribución de este recurso que ha sido considerado como un bien renovable e imperecedero el cual siempre estará ahí cuando se le necesite

  20. Sedimentation survey of Lago Loíza, Trujillo Alto, Puerto Rico, July 2009

    Science.gov (United States)

    Soler-López, Luis R.; Licha-Soler, N.A.

    2014-01-01

    Lago Loíza is a reservoir formed at the confluence of Río Gurabo and Río Grande de Loíza in the municipality of Trujillo Alto in central Puerto Rico, about 10 kilometers (km) north of the town of Caguas, about 9 km northwest of Gurabo, and about 3 km south of Trujillo Alto (fig. 1). The Carraizo Dam is owned and operated by the Puerto Rico Aqueduct and Sewer Authority (PRASA), and was constructed in 1953 as a water-supply reservoir for the San Juan Metropolitan area. The dam is a concrete gravity structure that is located in a shallow valley and has a gently sloping left abutment and steep right abutment. Non-overflow sections flank the spillway section. Waterways include an intake structure for the pumping station and power plant, sluiceways, a trash sluice, and a spillway. The reservoir was built to provide a storage capacity of 26.8 million cubic meters (Mm3) of water at the maximum pool elevation of 41.14 meters (m) above mean sea level (msl) for the Sergio Cuevas Filtration Plant that serves the San Juan metropolitan area. The reservoir has a drainage area of 538 square kilometers (km2) and receives an annual mean rainfall that ranges from 1,600 to 5,000 millimeters per year (mm/yr). The principal streams that drain into Lago Loíza are the Río Grande de Loíza, Río Gurabo, and Río Cañas. Two other rivers, the Río Bairoa and Río Cagüitas, discharge into the Río Grande de Loíza just before it enters the reservoir. The combined mean annual runoff of the Río Grande de Loíza and the Río Gurabo for the 1960–2009 period of record is 323 Mm3. Flow from these streams constitutes about 89 percent of the total mean annual inflow of 364 Mm3 to the reservoir (U.S. Geological Survey, 2009). Detailed information about Lago Loíza reservoir structures, historical sediment accumulation, and a dredge conducted in 1999 are available in Soler-López and Gómez-Gómez (2005). During July 8–15, 2009, the U.S. Geological Survey (USGS) Caribbean Water Science