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  1 / 5406 MEDLINE  
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PMID:29377943
Autor:Liang JF; An J; Gao JQ; Zhang XY; Yu FH
Endereço:School of Nature Conservation, Beijing Forestry University, Beijing, China.
Título:Effects of arbuscular mycorrhizal fungi and soil nutrient addition on the growth of Phragmites australis under different drying-rewetting cycles.
Fonte:PLoS One; 13(1):e0191999, 2018.
ISSN:1932-6203
País de publicação:United States
Idioma:eng
Resumo:The frequency of soil drying-rewetting cycles is predicted to increase under future global climate change, and arbuscular mycorrhizal fungi (AMF) are symbiotic with most plants. However, it remains unknown how AMF affect plant growth under different frequencies of soil drying-rewetting cycles. We subjected a clonal wetland plant Phragmites australis to three frequencies of drying-rewetting cycles (1, 2, or 4 cycles), two nutrient treatments (with or without), and two AMF treatments (with or without) for 64 days. AMF promoted the growth of P. australis, especially in the 2 cycles of the drying-rewetting treatment. AMF had a significant positive effect on leaf mass and number of ramets in the 2 cycles of the drying-rewetting treatment with nutrient addition. In the 2 cycles of drying-rewetting treatment without nutrient addition, AMF increased leaf area and decreased belowground to aboveground biomass ratio. These results indicate that AMF may assist P. australis in coping with medium frequency of drying-rewetting cycles, and provide theoretical guidance for predicting how wetland plants respond to future global climate change.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Soil)


  2 / 5406 MEDLINE  
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PMID:28465177
Autor:Liu NN; Chi Z; Wang QQ; Hong J; Liu GL; Hu Z; Chi ZM
Endereço:College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China.
Título:Simultaneous production of both high molecular weight pullulan and oligosaccharides by Aureobasdium melanogenum P16 isolated from a mangrove ecosystem.
Fonte:Int J Biol Macromol; 102:1016-1024, 2017 Sep.
ISSN:1879-0003
País de publicação:Netherlands
Idioma:eng
Resumo:After the compositional change of a pullulan production medium, a molecular weight (Mw) of the pullulan produced by Aureobasidium melanogenum P16 was 2.32×10 and a pullulan titer was 44.4g/L while a Mw of the pullulan produced by A. melanogenum P16 grown in the initial medium was only 3.47×10 and a pullulan titer was 65.3g/L. The increased Mw of the pullulan was due to the decreased activities of α-amylase, glucoamylase and pullulanase while the decreased pullulan titer was related to the decreased transcriptional levels of the genes encoding 6-P-glucose kinase, glucosyltransferase, α-phosphoglucose mutase, UDPG-pyrophosphorylase and pullulan synthetase. During the 10-L fermentation, when the yeast strain P16 was grown in the initial medium, the pullulan and oligosaccharide titers were 65.5g/L and 7.8g/L, respectively and the Mw of the produced pullulan was 4.42×10 while when the yeast strain P16 was grown in the compositionally changed medium, the pullulan and oligosaccharide titers were 46.4g/L and 27.8g/L, respectively and the Mw of the produced pullulan was 2.6×10 . Most of the oligosaccharides produced by the yeast strain P16 cultivated in the compositionally changed medium had degree of polymerization of 4 and 5. Therefore, both of the high Mw pullulan and oligosaccharides with high levels were produced by the yeast strain P16.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Glucans); 0 (Oligosaccharides); 8ZQ0AYU1TT (pullulan)


  3 / 5406 MEDLINE  
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PMID:28867554
Autor:Zhu LJ; Zhao Y; Chen YN; Cui HY; Wei YQ; Liu HL; Chen XM; Wei ZM
Endereço:College of Life Science, Northeast Agricultural University, Harbin 150030, China.
Título:Characterization of atrazine binding to dissolved organic matter of soil under different types of land use.
Fonte:Ecotoxicol Environ Saf; 147:1065-1072, 2018 Jan.
ISSN:1090-2414
País de publicação:Netherlands
Idioma:eng
Resumo:Atrazine is widely used in agriculture. In this study, dissolved organic matter (DOM) from soils under four types of land use (forest (F), meadow (M), cropland (C) and wetland (W)) was used to investigate the binding characteristics of atrazine. Fluorescence excitation-emission matrix-parallel factor (EEM-PARAFAC) analysis, two-dimensional correlation spectroscopy (2D-COS) and Stern-Volmer model were combined to explore the complexation between DOM and atrazine. The EEM-PARAFAC indicated that DOM from different sources had different structures, and humic-like components had more obvious quenching effects than protein-like components. The Stern-Volmer model combined with correlation analysis showed that log K values of PARAFAC components had a significant correlation with the humification of DOM, especially for C3 component, and they were all in the same order as follows: meadow soil (5.68)>wetland soil (5.44)>cropland soil (5.35)>forest soil (5.04). The 2D-COS further confirmed that humic-like components firstly combined with atrazine followed by protein-like components. These findings suggest that DOM components can significantly influence the bioavailability, mobility and migration of atrazine in different land uses.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Humic Substances); 0 (Soil); 0 (Soil Pollutants); QJA9M5H4IM (Atrazine)


  4 / 5406 MEDLINE  
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PMID:29478657
Autor:Liang JH; Liu PP; Chen Z; Sun GX; Li H
Endereço:Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China; State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
Título:Rapid evaluation of arsenic contamination in paddy soils using field portable X-ray fluorescence spectrometry.
Fonte:J Environ Sci (China); 64:345-351, 2018 Feb.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:Arsenic (As) in paddy fields is deteriorating food security and human health through rice ingestion. Rice is the dominant food source of arsenic exposure to half of the world's population. Therefore, an in situ effective method for As risk evaluation in paddy soil is strongly needed to avoid As exposure through rice ingestion. Herein, we developed a rapid analytical methodology for determination of As in plant tissues using field portable X-ray fluorescence spectrometry (FP-XRF). This method was applied to rice roots in order to evaluate the As contamination in paddy soils. The results showed that rice roots with iron plaques were superior to rhizosphere soils for generating FP-XRF signals, especially for field sites with As concentrations lower than the soil detection limit of FP-XRF (30.0mg/kg). Moreover, the strong linear relationships of As concentrations between the rice roots and corresponding leaves and grains proved that the rice root, rather than the soil, is a better predictor of As concentrations in rice grains. The research provides an efficient As monitoring method for As contaminated paddy fields by using wetland plant roots with iron plaques and XRF-based analytical techniques.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Soil); 0 (Soil Pollutants); N712M78A8G (Arsenic)


  5 / 5406 MEDLINE  
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PMID:29247932
Autor:Yildirim K; Kasim GÇ
Endereço:GOP University, Department of Bioengineering, Tokat, Turkey. Electronic address: kubi_yildirim@yahoo.com.
Título:Phytoremediation potential of poplar and willow species in small scale constructed wetland for boron removal.
Fonte:Chemosphere; 194:722-736, 2018 Mar.
ISSN:1879-1298
País de publicação:England
Idioma:eng
Resumo:Boron (B) pollution is an expanding environmental problem throughout the world due to intensive mining practices and extensive usage of B in agricultural chemicals and industrial products in recent years. The purpose of this study was to investigate B removal performance of four poplar and four willow species in small scale Constructed Wetland (CW). Rooted cuttings of tested species were treated with simulated wastewater having five elevated B concentrations (0.5, 5, 10, 20 and 40 ppm). All the tested species could resist up to 20 ppm wastewater B supply and could regrow from their roots in the soil having maximum 15 mg/kg B content. The result of the study indicated that 65% ± 5.3 of B was removed from the wastewater in 5 ppm B treatment while the same efficiency decreased to 45% ± 4.6 at 40 ppm B supply. The average effect of sediment on B removal was found to be approximately 20% for all B treatments while the remaining part of the loaded B was removed from the CW within effluent (35-54%). Therefore, actual effects of plant species on B removal was ranged from 45% to 25% between 5 and 40 ppm B treatments. Mass B removal within plant body (phytextraction) comprised the 13-10% of total loaded B in CW while the remaining part of the loaded B (31-15%) was stabilized into the sediment with the effects of poplar and willow roots. These results presented clear understanding of effective B purification mechanisms in CWs. Boron phytextraction capacity of a plant species was less effective than its phytstabilization efficiency which increase filtering capacity of the sediment and stabilization of more B around the rhizosphere. In terms of their B removal ability, P.nigra and S.anatolica had the highest B removal capacities with phytextraction (20-11%) while S.alba, P.alba and S.babylonica had more phytstabilizaiton performance (40-15%) in CW. Disposal of B loaded plant material create another environmental costs for CW applications. Therefore, B loaded wood and leaf tissues were mixed and used for production of wooden panels in the study. Then a combustion test was applied on these panels to test their fire resistance. The results of the tests revealed much higher burning tolerance of the B loaded panels (5-20%) compared to controls. Annual harvesting, fast growing and deep rooting ability of the poplar and willow species with their high phytstabilization and phytextraction efficiencies make these species excellent tools to remove B from the polluted waters. Utilization of these species for B removal in large scale CWs is quite possible which should be also investigated in further studies.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Soil); 0 (Waste Water); 0 (Water Pollutants, Chemical); N9E3X5056Q (Boron)


  6 / 5406 MEDLINE  
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PMID:29202308
Autor:Lu X; Huang J; Shao C; Berger H
Endereço:The Key Laboratory of Biomedical Information Engineering, Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China; University of Innsbruck, Research Institute for Limnology, Mondseestrasse 9, 5310 Mondsee, Austria; Institute of Evolution & Mar
Título:Morphology, cell-division, and phylogeny of Schmidingerothrix elongata spec. nov. (Ciliophora, Hypotricha), and brief guide to hypotrichs with Gonostomum-like oral apparatus.
Fonte:Eur J Protistol; 62:24-42, 2018 Feb.
ISSN:1618-0429
País de publicação:Germany
Idioma:eng
Resumo:The hypotrich Schmidingerothrix elongata spec. nov., discovered in saline (20‰) soil of the Longfeng Wetland, Daqing, northern China, was studied using live observation and protargol impregnation. It is characterized, inter alia, by colorless cortical granules arranged in short rows, three frontoventral cirral rows with the rightmost extending far posteriorly, and 4-8, usually six macronuclear nodules. Cell division proceeds as in congeners and confirms the lack of dorsal ciliature. In phylogenetic analyses based on SSU rDNA, S. elongata is sister of S. salinarum+Paracladotricha salina. A re-investigation of the type slides of P. salina, type of Paracladotricha, revealed a misobservation in the original description. Since P. salina lacks, like Schmidingerothrix spp., a dorsal ciliature, Paracladotricha becomes a junior, subjective synonym of Schmidingerothrix with S. salina comb. nov. as fourth species. A review of the phylogenetic analyses dealing with Schmidingerothrix shows that its position is variable. However, together with the gonostomatid oral apparatus it can be hypothesized that Schmidingerothrix is a member of the Gonostomatidae or a close relative. A list of genera (14) and species (58) which have - like Schmidingerothrix - a gonostomatid oral apparatus, as well as a key to these genera are provided.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (RNA, Ribosomal, 18S); 0 (Soil)


  7 / 5406 MEDLINE  
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PMID:29251883
Autor:Pal S; Chattopadhyay B; Mukhopadhyay SK
Título:Spatio-temporal study of carbon sequestration through piscicultural practice at East Kolkata Wetland.
Fonte:J Environ Biol; 37(5):965-71, 2016 09.
ISSN:0254-8704
País de publicação:India
Idioma:eng
Resumo:The present study focus the variation of carbon concentrations within three trophic level i.e., primary producer (phytoplankton), primary consumers (zooplankton) and secondary consumers (fish) in three selected ponds at East Kolkata Wetland area. Depending on the amount and frequency of wastewater input, physico-chemical characteristics of pond, species richness, predator-prey interactions and pond wise different piscicultural practices, the amount of carbon sequestration varied spatially. Significant temporal variations were also observed in each trophic level of these three selected East Kolkata Wetland pond ecosystems. On average primary producers were sequestered 2038.6 ± 244.8mg C m-3 d-1 whereas 307 ± 19.3 mg C m-3 and 11531.4 ± 318.2mg C m-3 was sequestered by primary and secondary consumers, respectively. In Kolkata and its nearby districts over 90% of the production was marked from the East Kolkata Wetland area. Consequently, a significant amount of sequestered carbon was exported from the East Kolkata Wetland ecosystem in the form of fish and this continuous system might increase the carbon sequestration efficiency of the aquatic ecosystem.
Tipo de publicação: RESEARCH SUPPORT, NON-U.S. GOV'T; JOURNAL ARTICLE
Nome de substância:7440-44-0 (Carbon)


  8 / 5406 MEDLINE  
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PMID:29257642
Autor:Shiji M; Sabitha AR; Prabhakar K; Harikumar PS
Título:Water quality assessment of Kavvayi Lake of northern Kerala, India using CCME water quality index and biological water quality criteria.
Fonte:J Environ Biol; 37(6):1265-72, 2016 Nov.
ISSN:0254-8704
País de publicação:India
Idioma:eng
Resumo:Assessment of water quality status of 7 sites of Kavvayi Wetland in northern Kerala (India) was carried out. The physico-chemical, bacteriological and biological parameters were monitored during pre-monsoon, monsoon and post-monsoon seasons. Canadian Council of Ministers of the Environment (CCME) water quality index of the Kavvayi Lake samples ranged from 43.99-44.77; indicating that water quality was threatened or impaired. The poor water quality status might be due to dumping of wastes from municipal and domestic sources and agricultural runoff. Biological water quality criteria (BWQC) determined for wetland revealed that stations such as mixing point of Kariangode River into Kavvayi Lake and Kottikkadavu was moderately polluted in pre-monsoon and post- monsoon seasons. Mixing point of Nileswar River into Kavvayi Lake was moderately polluted in pre-monsoon season. Both calculated indices suggest that quality of lake was found to be influenced by anthropogenic activities such as unscientific tourism and infrastructure development, land encroachment, sand mining, pollution etc. The study was carried out as part of a programme, which aimed to conserve Kavvayi wetland because of its unique ecological and environmental characteristics.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Water Pollutants, Chemical); 059QF0KO0R (Water)


  9 / 5406 MEDLINE  
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Texto completo SciELO Brasil
PMID:29236930
Autor:Marinho-E-Silva M; Sallum MAM; Rosa-Freitas MG; Lourenço-de-Oliveira R; Silva-do-Nascimento TF
Endereço:Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz-Fiocruz, Rio de Janeiro, RJ, Brasil.
Título:Anophelines species and the receptivity and vulnerability to malaria transmission in the Pantanal wetlands, Central Brazil.
Fonte:Mem Inst Oswaldo Cruz; 113(2):87-95, 2018 Feb.
ISSN:1678-8060
País de publicação:Brazil
Idioma:eng
Resumo:BACKGROUND Studies on malaria vectors in the Pantanal biome, Central Brazil, were conducted more than half a century ago. OBJECTIVES To update anopheline records and assess receptivity and vulnerability to malaria transmission. METHODS Five-day anopheline collections were conducted bimonthly in Salobra, Mato Grosso do Sul state, for one year. Indoors, mosquitoes were collected from their resting places, while in open fields, they were captured using protected human-baited and horse-baited traps near the house and at the Miranda River margin, respectively. Hourly biting activity outdoors was also assessed. Secondary data were collected on the arrival of tourists, economic projects, and malaria cases. FINDINGS A total of 24,894 anophelines belonging to 13 species were caught. The main Brazilian malaria vector Anopheles darlingi was the predominant species, followed by An. triannulatus s.l. Hourly variation in anopheline biting showed three main peaks occurring at sunset, around midnight, and at sunrise, the first and last being the most prominent. The highest density of all species was recorded near the river margin and during the transition period between the rainy and early dry seasons. This coincides with the time of main influx of outsider workers and tourists, whose activities mostly occur in the open fields and frequently start before sunrise and last until sunset. Some of these individuals originate from neighbouring malaria-endemic countries and states, and are likely responsible for the recorded imported and introduced malaria cases. MAIN CONCLUSION Pantanal is a malaria-prone area in Brazil. Surveillance and anopheline control measures must be applied to avoid malaria re-emergence in the region.
Tipo de publicação: JOURNAL ARTICLE


  10 / 5406 MEDLINE  
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PMID:29388535
Autor:Hu D; Wang L; Lai Q; Sun F; Shao Z
Endereço:1​Key Laboratory of Marine Genetic Resources, The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, PR China.
Título:Marivivens niveibacter sp. nov., isolated from the seawater of tropical mangrove.
Fonte:Int J Syst Evol Microbiol; 68(2):570-574, 2018 Feb.
ISSN:1466-5034
País de publicação:England
Idioma:eng
Resumo:A novel bacterial strain, designated HSLHS2 , was isolated from the seawater of a tropical mangrove forest. Cells of strain HSLHS2 were found to be aerobic, Gram-stain-negative, non-flagellated, non-motile, short rods. Oxidase- and catalase-positive. Growth was observed at 5-40 °C (optimum, 35 °C), at pH 6.0-10.0 (optimum pH 8.0) and in 0-10 % NaCl (optimum 2 %, w/v). Strain HSLHS2 shared highest 16S rRNA gene sequence similarity with Celeribacter halophilus ZXM137 (95.4 %), but formed a distinct phyletic lineage and coherent phylogenetic cluster associated with Marivivens donghaensis AM-4 (95.1 %). The dominant fatty acids were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c) and C16 : 0. The respiratory quinone was determined to be Q-10. The polar lipids comprised phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, three unidentified aminolipids, four unidentified lipids, five unidentified phospholipids. The DNA G+C contents was 54.6 mol%. The combined genotypic and phenotypic data indicated that strain HSLHS2 represents a novel species of the genus Marivivens, for which the name Marivivensniveibacter sp. nov. is proposed. The type strain is HSLHS2 (=KCTC 52588 =MCCC 1A06712 ).
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (DNA, Bacterial); 0 (Fatty Acids); 0 (Phospholipids); 0 (RNA, Ribosomal, 16S); 1339-63-5 (Ubiquinone); I7T5V2W47R (Ubiquinone Q2)



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