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  1 / 2282 MEDLINE  
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PMID:28923725
Autor:Baoune H; Ould El Hadj-Khelil A; Pucci G; Sineli P; Loucif L; Polti MA
Endereço:Laboratoire de protection des écosystème en zones arides et semi-arides, FNSV, Université Kasdi Merbah Ouragla, 30000, Algeria. Electronic address: baounehafida@hotmail.fr.
Título:Petroleum degradation by endophytic Streptomyces spp. isolated from plants grown in contaminated soil of southern Algeria.
Fonte:Ecotoxicol Environ Saf; 147:602-609, 2018 Jan.
ISSN:1090-2414
País de publicação:Netherlands
Idioma:eng
Resumo:Petroleum hydrocarbons are well known by their high toxicity and recalcitrant properties. Their increasing utilization around worldwide led to environmental contamination. Phytoremediation using plant-associated microbe is an interesting approach for petroleum degradation and actinobacteria have a great potential for that. For this purpose, our study aimed to isolate, characterize, and assess the ability of endophytic actinobacteria to degrade crude petroleum, as well as to produce plant growth promoting traits. Seventeen endophytic actinobacteria were isolated from roots of plants grown naturally in sandy contaminated soil. Among them, six isolates were selected on the basis of their tolerance to petroleum on solid minimal medium and characterized by 16S rDNA gene sequencing. All petroleum-tolerant isolates belonged to the Streptomyces genus. Determination by crude oil degradation by gas chromatorgraph-flame ionization detector revealed that five strains could use petroleum as sole carbon and energy source and the petroleum removal achieved up to 98% after 7 days of incubation. These isolates displayed an important role in the degradation of the n-alkanes (C -C ), aromatic and polycyclic aromatic hydrocarbons. All strains showed a wide range of plant growth promoting features such as siderophores, phosphate solubilization, 1-aminocyclopropane-1-carboxylate deaminase, nitrogen fixation and indole-3-acetic acid production as well as biosurfactant production. This is the first study highlighting the petroleum degradation ability and plant growth promoting attributes of endophytic Streptomyces. The finding suggests that the endophytic actinobacteria isolated are promising candidates for improving phytoremediation efficiency of petroleum contaminated soil.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Petroleum); 0 (Soil); 0 (Soil Pollutants); EC 3.5.99.7 (1-aminocyclopropane-1-carboxylate deaminase); EC 4.1.- (Carbon-Carbon Lyases)


  2 / 2282 MEDLINE  
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PMID:28943349
Autor:Talbi A; Kerchich Y; Kerbachi R; Boughedaoui M
Endereço:Environmental Science and Technology Laboratory, National Polytechnic School of Algiers, Algiers 16200, Algeria.
Título:Assessment of annual air pollution levels with PM1, PM2.5, PM10 and associated heavy metals in Algiers, Algeria.
Fonte:Environ Pollut; 232:252-263, 2018 Jan.
ISSN:1873-6424
País de publicação:England
Idioma:eng
Resumo:Concentrations of particulate matter less than 1  µm, 2.5  µm, 10 µm and their contents of heavy metals were investigated in two different stations, urban and roadside at Algiers (Algeria). Sampling was conducted during two years by a high volume samplers (HVS) equipped with a cascade impactor at four levels stage, for one year sampling. The characterization of the heavy metals associated to the particulate matter (PM) was carried out by X-Ray Fluorescence analysis (XRF). The annual average concentration of PM , PM and PM in both stations were 18.24, 32.23 and 60.01 µg m respectively. The PM , PM and PM concentrations in roadside varied from 13.46 to 25.59 µg m , 20.82-49.85 µg m and 45.90-77.23 µg m respectively. However in the urban station, the PM , PM and PM concentrations varied from 10.45 to 26.24 µg m , 18.53-47.58 µg m and 43.8-91.62 µg m . The heavy metals associated to the PM were confirmed by Scanning Electron Microscopy-Energy Dispersive X-Ray analyses (SEM-EDX). The different spots of PM analysis by SEM-EDX shows the presence of nineteen elements with anthropogenic and natural origins, within the heavy metal detected, the lead was found with maximum of 5% (weight percent). In order to determine the source contributions of PM levels at the two sampling sites sampling, principal compound analysis (PCA) was applied to the collected data. Statistical analysis confirmed anthropogenic source with traffic being a significant source and high contribution of natural emissions. At both sites, the PM /PM ratio is lower than that usually recorded in developed countries. The study of the back-trajectories of the air masses starting from Sahara shows that desert dust influences the concentration and the composition of the PM measured in Algiers.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Air Pollutants); 0 (Dust); 0 (Metals, Heavy); 0 (Particulate Matter)


  3 / 2282 MEDLINE  
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PMID:28452033
Autor:Amri F
Endereço:University of Chartage, Faculty of Economic Sciences and Management of Nabeul, Street Hammamet, Mrezgua, 8000, Nabeul, Tunisia. fethiamri.fsegn@gmail.com.
Título:Carbon dioxide emissions, output, and energy consumption categories in Algeria.
Fonte:Environ Sci Pollut Res Int; 24(17):14567-14578, 2017 Jun.
ISSN:1614-7499
País de publicação:Germany
Idioma:eng
Resumo:This study examines the relation between CO emissions, income, non-renewable, and renewable energy consumption in Algeria during the period extending from 1980 to 2011. Our work gives particular attention to the validity of environmental Kuznets curve (EKC) hypothesis. The autoregressive distributed lag (ARDL) with break point method outcome demonstrates the positive effect of non-renewable type of energy on CO emissions consumption. On the contrary, the results reveal an insignificant effect of renewable energy on environment improvement. Moreover, the results accept the existence of EKC hypothesis but the highest gross domestic product value in logarithm scale of our data is inferior to the estimated turning point. Consequently, policy-makers in Algeria should expand the ratio of renewable energy and should decrease the quota of non-renewable energy consumption.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:142M471B3J (Carbon Dioxide)


  4 / 2282 MEDLINE  
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PMID:28859113
Autor:Guellati FZ; Touati H; Tambosco K; Quiblier C; Humbert JF; Bensouilah M
Endereço:Ecobiologie des milieux marins et litoraux; Faculté des sciences, BP 12 El- Hadjar, University Badji Mokhtar, Annaba, Algerie.
Título:Unusual cohabitation and competition between Planktothrix rubescens and Microcystis sp. (cyanobacteria) in a subtropical reservoir (Hammam Debagh) located in Algeria.
Fonte:PLoS One; 12(8):e0183540, 2017.
ISSN:1932-6203
País de publicação:United States
Idioma:eng
Resumo:Succession in bloom-forming cyanobacteria belonging to distant functional groups in freshwater ecosystems is currently an undescribed phenomenon. However in the Hammam Debagh reservoir (Algeria), P. rubescens and Microcystis sp. co-occur and sometimes proliferate. With the aim of identifying the main factors and processes involved in this unusual cohabitation, water samples were collected monthly from February 2013 to June 2015 at the subsurface at four sampling stations and along the entire water column at one sampling station. In addition, the composition of the cyanobacterial communities was estimated by Illumina sequencing of a 16S rRNA gene fragment from samples collected over one year (October 2013-November 2014). This molecular approach showed that the Hammam Debagh reservoir displays high species richness (89 species) but very low diversity due to the high dominance of Microcystis in this community. Furthermore, it appears that Planktothrix rubescens and Microcystis sp. coexisted (from September to January) but proliferated alternately (Spring 2015 for P. rubescens and Spring 2014 and Autumn 2014/2015 for Microcystis). The main factors and processes explaining these changes in bloom-forming species seem to be related to the variation in the depth of the lake during the mixing period and to the water temperatures during the winter prior to the bloom season in spring.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (RNA, Ribosomal, 16S)


  5 / 2282 MEDLINE  
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PMID:28771154
Autor:Djouadi LN; Selama O; Abderrahmani A; Bouanane-Darenfed A; Abdellaziz L; Amziane M; Fardeau ML; Nateche F
Endereço:Laboratory of Cellular and Molecular Biology, Microbiology team, Faculty of Biological Sciences, USTHB, Bab ezzouar -BP n°32, Algiers, Algeria.
Título:Multiresistant opportunistic pathogenic bacteria isolated from polluted rivers and first detection of nontuberculous mycobacteria in the Algerian aquatic environment.
Fonte:J Water Health; 15(4):566-579, 2017 Aug.
ISSN:1477-8920
País de publicação:England
Idioma:eng
Resumo:Opportunistic infections constitute a major challenge for modern medicine mainly because the involved bacteria are usually multiresistant to antibiotics. Most of these bacteria possess remarkable ability to adapt to various ecosystems, including those exposed to anthropogenic activities. This study isolated and identified 21 multiresistant opportunistic bacteria from two polluted rivers, located in Algiers. Cadmium, lead, and copper concentrations were determined for both water samples to evaluate heavy metal pollution. High prevalence of Enterobacteria and non-fermentative Gram-negative rods was found and a nontuberculous Mycobacterium (NTM) strain was isolated. To the best of our knowledge, this is the first detection of NTM in the Algerian environment. The strains were tested for their resistance against 34 antibiotics and 8 heavy metals. Multiple antibiotics and heavy metals resistance was observed in all isolates. The two most resistant strains, identified as Acinetobacter sp. and Citrobacter freundii, were submitted to plasmid curing to determine if resistance genes were plasmid or chromosome encoded. Citrobacter freundii strain P18 showed a high molecular weight plasmid which seems to code for resistance to zinc, lead, and tetracycline, at the same time. These findings strongly suggest that anthropized environments constitute a reservoir for multiresistant opportunistic bacteria and for circulating resistance genes.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (DNA, Bacterial); 0 (Metals, Heavy); 0 (RNA, Ribosomal, 16S)


  6 / 2282 MEDLINE  
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PMID:28609984
Autor:Benkenana N; Massa B
Endereço:Laboratoire de Biosystématique et Ecologie des Arthropodes, Université Mentouri, Constantine, route d'Aïn-El-Bey, 25000, Constantine, Algérie.. benkenanan@yahoo.co.nz.
Título:A new species of Pamphagus (Orthoptera: Pamphagidae) from Algeria with a key to all the species of the genus.
Fonte:Zootaxa; 4254(1):102-110, 2017 Apr 12.
ISSN:1175-5334
País de publicação:New Zealand
Idioma:eng
Resumo:The authors describe Pamphagus milevitanus n. sp. occurring in the North and South highlands of Constantine, in Mila, Setif and Oum-el Bouaghi provinces, where it is fairly common. They compare the characters of this species with those of the most related species of the genus and present a complete plate and a key to all the species of the genus Pamphagus known to date.
Tipo de publicação: JOURNAL ARTICLE


  7 / 2282 MEDLINE  
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PMID:28506272
Autor:Djeffal S; Bakour S; Mamache B; Elgroud R; Agabou A; Chabou S; Hireche S; Bouaziz O; Rahal K; Rolain JM
Endereço:GSPA research Laboratory (Management of Animal Health and Productions), Institute of Veterinary Sciences, University Frères Mentouri Constantine 1, Constantine, Algeria.
Título:Prevalence and clonal relationship of ESBL-producing Salmonella strains from humans and poultry in northeastern Algeria.
Fonte:BMC Vet Res; 13(1):132, 2017 May 15.
ISSN:1746-6148
País de publicação:England
Idioma:eng
Resumo:BACKGROUND: The aims of this study were to investigate Salmonella contamination in broiler chicken farms and slaughterhouses, to assess the antibiotic resistance profile in avian and human Salmonella isolates, and to evaluate the relationship between avian and human Extended Spectrum ß-Lactamase (ESBL)-producing isolates. Salmonella was screened in different sample matrices collected at thirty-two chicken farms and five slaughterhouses. The human isolates were recovered from clinical specimens at the University Teaching Hospital of Constantine (UTH). All suspected colonies were confirmed by MALDI-TOF (Matrix Assisted Laser Desorption Ionization Time OF light) and serotyped. Susceptibility testing against 13 antibiotics including, amoxicillin/clavulanic acid, ticarcillin, cefoxitin, cefotaxime, aztreonam, imipenem, ertapenem, gentamicin, amikacin, ciprofloxacin, colistin, trimethoprim/sulfamethoxazole and fosfomycin, was performed using the disk diffusion method on Mueller-Hinton agar. ESBL-production was screened by the double-disk synergy test and confirmed by molecular characterization using PCR (polymerase chain reaction) amplification and sequencing of ESBL encoding genes. Clonality of the avian and human strains was performed using the Multi Locus Sequencing Typing method (MLST). RESULTS: Forty-five isolated avian Salmonella strains and 37 human collected ones were studied. Five S. enterica serotypes were found in avian isolates (mainly Kentucky) and 9 from human ones (essentially Infantis). 51.11% and 26.6% of the avian isolates were resistant to ciprofloxacin and cefotaxime, respectively, whereas human isolates were less resistant to these antibiotics (13.5% to ciprofloxacin and 16.2% to cefotaxime). Eighteen (12 avian and 6 human) strains were found to produce ESBLs, which were identified as bla (n = 12), bla (n = 5) and bla group (n = 8). Interestingly, seven of the ESBL-producing strains (5 avian and 2 human) were of the same ST (ST15) and clustered together, suggesting a common origin. CONCLUSION: The results of the combined phenotypic and genotypic analysis found in this study suggest a close relationship between human and avian strains and support the hypothesis that poultry production may play a role in the spread of multidrug-resistant Salmonella in the human community within the study region.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Anti-Bacterial Agents); EC 3.5.2.6 (beta-Lactamases)


  8 / 2282 MEDLINE  
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PMID:28495193
Autor:Yekkour F; Aubert D; Mercier A; Murat JB; Khames M; Nguewa P; Ait-Oudhia K; Villena I; Bouchene Z
Endereço:University of Medea, School of Sciences, Department of Biology, Medea, Algeria; National Veterinary High School, Algiers, Algeria. Electronic address: ferielyekkour@yahoo.fr.
Título:First genetic characterization of Toxoplasma gondii in stray cats from Algeria.
Fonte:Vet Parasitol; 239:31-36, 2017 May 30.
ISSN:1873-2550
País de publicação:Netherlands
Idioma:eng
Resumo:Toxoplasmosis is a parasitic disease with worldwide distribution and a major public health problem. In Algeria, no data are currently available about genotypes of Toxoplasma gondii isolated from animals or humans. The present study assesses for the first time the seroprevalence of toxoplasmosis in stray cats, and provides molecular characterization of T. gondii strains circulating in this feline population in Algiers, the capital city of Algeria. Sera from 96 stray cats were tested for the presence of antibodies against T. gondii using the modified agglutination test. The seroprevalence was 50% (48/96) using 1:6 as the positivity cut-off. Different organs samples from stray cats, including heart samples, were tested for the presence of Toxoplasma DNA using real-time PCR. T. Gondii DNA was detected in 90.6% (87/96) of hearts. Of these parasitic DNAs, 22 were submitted to genotyping through the analysis of 15 microsatellite markers. The identified genotypes (12 of 22) mainly belonged to the type II lineage.
Tipo de publicação: JOURNAL ARTICLE


  9 / 2282 MEDLINE  
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PMID:28494104
Autor:Khalfa A; Tiali A; Zemour L; Fatah A; Mekki K
Endereço:Département de Biologie, Université d'Oran1 Ahmed Benbella, Oran, Algeria.
Título:Prevalence of metabolic syndrome and its association with lifestyle and cardiovascular biomarkers among postmenopausal women in western Algeria.
Fonte:Int J Gynaecol Obstet; 138(2):201-206, 2017 Aug.
ISSN:1879-3479
País de publicação:United States
Idioma:eng
Resumo:OBJECTIVE: To evaluate the prevalence of metabolic syndrome (MetS), its components, and their relationship with lifestyle, inflammation, and oxidative stress among postmenopausal Algerian women. METHODS: A prospective cross-sectional survey was conducted among postmenopausal women at a clinic in Oran, Algeria, from March 1 to June 28, 2015. A diagnosis of MetS was made using the National Cholesterol Education Program Adult Treatment Panel III guidelines. Demographic, clinical, metabolic, inflammatory, dietary, and energy variables were assessed. RESULTS: Among 183 participants, 106 (57.9%) were diagnosed with MetS. Components of MetS included hypertension (n=144, 78.7%), hyperglycemia (n=135, 73.8%), hypertriglyceridemia (n=125, 68.3%), abdominal obesity (n=123, 67.2%), and low levels of high-density lipoprotein cholesterol (n=121, 66.1%). Although daily energy expenditure was similar among the women with or without MetS, total energy intake was increased in the group with MetS (P<0.001). The following measures were also increased among women with MetS: saturated fatty acid intake (P<0.001), C-reactive protein (P=0.051), thiobarbituric acid reactive substances (P<0.001), and carbonyls (P<0.001). By contrast, decreased monounsaturated fatty acid intake (P=0.024) and catalase activity (P<0.001) were observed in this group. CONCLUSION: Postmenopausal status could predict MetS, with inflammation and oxidative stress arising from an unhealthy lifestyle potentially increasing cardiovascular risk.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Biomarkers)


  10 / 2282 MEDLINE  
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PMID:28493182
Autor:Belabed BE; Meddour A; Samraoui B; Chenchouni H
Endereço:Aquaculture & Pathology Research Lab, Marine Sciences Department, Annaba University, 23000, Annaba, Algeria.
Título:Modeling seasonal and spatial contamination of surface waters and upper sediments with trace metal elements across industrialized urban areas of the Seybouse watershed in North Africa.
Fonte:Environ Monit Assess; 189(6):265, 2017 Jun.
ISSN:1573-2959
País de publicação:Netherlands
Idioma:eng
Resumo:Industrialization and urbanization are the main sources of pollutions worldwide and particularly in developing countries. This study aims the determination of anthropogenic inputs with trace metals in aquatic ecosystems at the Plain of Annaba (NE Algeria), which is known as one of the largest industrial areas in Africa. Samples of surface waters and upper sediments were conducted in six stations: four in Meboudja wadi and two in Seybouse wadi. Contents of iron, copper, chromium, nickel, zinc, and manganese were measured by atomic absorption spectrophotometry, whereas Cd and Pb were determined using electrothermal atomic absorption spectrometry. Measurements of Hg were carried out using atomic fluorescence. Spatiotemporal variations of metal concentrations were tested using generalized linear models (GLM), whereas the influence of water pollution on sediment contamination was tested with generalized additive models (GAMs). Metal contents measured in surface water and sediments varied differently from upstream to downstream of the study wadis and between seasons. The results showed that the surface water was polluted with high levels of iron, nickel, chromium, lead, and cadmium. Values of the contamination index revealed that the surface sediments were contaminated by iron, chromium, lead, and cadmium. The GAMs indicated that water-phase metal concentrations had no significant effects on trace metal concentrations in the sediment. This suggests that seasonal metal concentrations in water phase, which are measured during the study period (2012) and are time-dependent, contribute increasingly and gradually over time-not immediately-to the accumulation of metals into the sediments. Therefore, the long-term accumulation of metals in the sediments resulted from the continuous discharges of metals in the water phase. The anthropogenic impacts are marked by high contaminations of Meboudja wadi particularly in downstream areas of the steel factory and the nearby industrial areas. The direct industrial discharges into the water and atmosphere (iron, lead, cadmium) as well as urban disposals and agricultural activities are at the origin of these contaminations.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Metals); 0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium); 0R0008Q3JB (Chromium); 42Z2K6ZL8P (Manganese); 789U1901C5 (Copper); 7OV03QG267 (Nickel); E1UOL152H7 (Iron); J41CSQ7QDS (Zinc)



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