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  1 / 2627 MEDLINE  
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[PMID]:29225047
[Au] Autor:Trnková K; Kotrbancová M; Spaleková M; Fulová M; Boledovicová J; Vesteg M
[Ad] Endereço:Department of the Environment, Faculty of Natural Sciences, Matej Bel University, Tajovského 55, 974 01 Banská Bystrica, Slovakia. Electronic address: katarina.trnkova@umb.sk.
[Ti] Título:MALDI-TOF MS analysis as a useful tool for an identification of Legionella pneumophila, a facultatively pathogenic bacterium interacting with free-living amoebae: A case study from water supply system of hospitals in Bratislava (Slovakia).
[So] Source:Exp Parasitol;184:97-102, 2018 Jan.
[Is] ISSN:1090-2449
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Legionellae, i.e. Legionella pneumophila, are human bacterial hydrophilic facultative pathogens causing pneumonia (Legionnaires' disease). Free-living amoebae (FLA) can serve as natural hosts and thus as reservoirs of many amoebae-resistant bacteria. An encysted amoeba can contribute to the resistance of intracellular L. pneumophila to various chemical and physical treatments. Humans can be infected by droplets containing bacteria from an environmental source or human-made devices such as shower heads, bathtubs, air-conditioning units or whirlpools. In this study, we were investigating the presence of FLA and L. pneumophila in plumbing systems of healthcare facilities in Bratislava (Slovakia) by standard diagnostic methods, while the presence of L. pneumophila was verified also by MALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) analysis. The results showed the occurrence of L. pneumophila and FLA in 62.26% and 66.4% of samples taken from four paediatric clinics, respectively. Both standard methods and MALDI-TOF MS showed comparable results and they can be successfully applied for the identification of L. pneumophila strains in environmental samples. Our approach could be useful for further monitoring, prevention and decreasing risk of Legionella infection also in other hospitals.
[Mh] Termos MeSH primário: Amoeba/isolamento & purificação
Legionella pneumophila/isolamento & purificação
Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/normas
Microbiologia da Água
Abastecimento de Água/normas
[Mh] Termos MeSH secundário: Amoeba/classificação
Amoeba/crescimento & desenvolvimento
Criança
Pré-Escolar
Água Potável/microbiologia
Água Potável/parasitologia
Hospitais Pediátricos
Seres Humanos
Lactente
Recém-Nascido
Legionella pneumophila/crescimento & desenvolvimento
Eslováquia
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Drinking Water)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180205
[Lr] Data última revisão:
180205
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171212
[St] Status:MEDLINE


  2 / 2627 MEDLINE  
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[PMID]:28807993
[Au] Autor:Pollard TD
[Ad] Endereço:Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT thomas.pollard@yale.edu.
[Ti] Título:Nine unanswered questions about cytokinesis.
[So] Source:J Cell Biol;216(10):3007-3016, 2017 Oct 02.
[Is] ISSN:1540-8140
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Experiments on model systems have revealed that cytokinesis in cells with contractile rings (amoebas, fungi, and animals) depends on shared molecular mechanisms in spite of some differences that emerged during a billion years of divergent evolution. Understanding these fundamental mechanisms depends on identifying the participating proteins and characterizing the mechanisms that position the furrow, assemble the contractile ring, anchor the ring to the plasma membrane, trigger ring constriction, produce force to form a furrow, disassemble the ring, expand the plasma membrane in the furrow, and separate the daughter cell membranes. This review reveals that fascinating questions remain about each step.
[Mh] Termos MeSH primário: Amoeba/fisiologia
Evolução Biológica
Membrana Celular/fisiologia
Citocinese/fisiologia
Fungos/fisiologia
[Mh] Termos MeSH secundário: Animais
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171007
[Lr] Data última revisão:
171007
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170816
[St] Status:MEDLINE
[do] DOI:10.1083/jcb.201612068


  3 / 2627 MEDLINE  
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[PMID]:28759330
[Au] Autor:Colson P; La Scola B; Raoult D
[Ad] Endereço:Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), Aix Marseille Université, UM63, CNRS 7278, IRD 198, INSERM 1095, Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Assistance Publique-Hôpitaux de Marseille (AP-HM), 13005 Marseille, France; email: didier.raoult@gmail.com.
[Ti] Título:Giant Viruses of Amoebae: A Journey Through Innovative Research and Paradigm Changes.
[So] Source:Annu Rev Virol;4(1):61-85, 2017 Sep 29.
[Is] ISSN:2327-0578
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Giant viruses of amoebae were discovered serendipitously in 2003; they are visible via optical microscopy, making them bona fide microbes. Their lifestyle, structure, and genomes break the mold of classical viruses. Giant viruses of amoebae are complex microorganisms. Their genomes harbor between 444 and 2,544 genes, including many that are unique to viruses, and encode translation components; their virions contain >100 proteins as well as mRNAs. Mimiviruses have a specific mobilome, including virophages, provirophages, and transpovirons, and can resist virophages through a system known as MIMIVIRE (mimivirus virophage resistance element). Giant viruses of amoebae bring upheaval to the definition of viruses and tend to separate the current virosphere into two categories: very simple viruses and viruses with complexity similar to that of other microbes. This new paradigm is propitious for enhanced detection and characterization of giant viruses of amoebae, and a particular focus on their role in humans is warranted.
[Mh] Termos MeSH primário: Amoeba/virologia
Genoma Viral
Vírus Gigantes/genética
Vírus Gigantes/fisiologia
[Mh] Termos MeSH secundário: DNA Viral
Vírus Gigantes/classificação
Vírus Gigantes/isolamento & purificação
Interações Hospedeiro-Patógeno
Mimiviridae/genética
Filogenia
Vírion/genética
Virófagos/genética
Virófagos/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (DNA, Viral)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171027
[Lr] Data última revisão:
171027
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170801
[St] Status:MEDLINE
[do] DOI:10.1146/annurev-virology-101416-041816


  4 / 2627 MEDLINE  
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[PMID]:28688372
[Au] Autor:Roe HM; Elliott SM; Patterson RT
[Ad] Endereço:School of Natural and Built Environment, Queen's University Belfast, Belfast BT7 1NN, United Kingdom. Electronic address: h.roe@qub.ac.uk.
[Ti] Título:Re-assessing the vertical distribution of testate amoeba communities in surface peats: Implications for palaeohydrological studies.
[So] Source:Eur J Protistol;60:13-27, 2017 Aug.
[Is] ISSN:1618-0429
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Testate amoeba-derived transfer functions are frequently used in peatland palaeohydrological studies and involve the development of training sets from surficial peats. However, within acrotelmic peats, considerable vertical variation in assemblage composition can occur, particularly along Sphagnum stems, which may limit the representation of the associated 'contemporary' testate amoeba samples as analogues for the peatland surface. This paper presents contiguous testate amoeba assemblage data from nine monoliths collected from different peatland microforms (hummock, hollow, lawn) in three Sphagnum dominated ombrotrophic peatlands in Ontario and Quebec, eastern Canada. The aim is to: (i) gain a greater understanding of the vertical distribution of xerophilous/hygrophilous taxa along Sphagnum stems; (ii) determine the vertical extent of live/encysted taxa along this gradient; and (iii) assess the significance of this distribution on surface sampling protocols. The results show that testate amoeba communities in the uppermost acrotelmic peat layers display considerable variability. This may reflect a complex interplay of abiotic and biotic controls, including moisture, temperature, light and other characteristics, food availability, and mineral particle availability for test construction. These findings underline the complexity of testate amoeba community structure and highlight the importance of analysing both living and dead Sphagnum stem sections when developing calibration sets.
[Mh] Termos MeSH primário: Amoeba/fisiologia
Biodiversidade
Solo/parasitologia
[Mh] Termos MeSH secundário: Amoeba/classificação
Hidrologia
Paleontologia
Dinâmica Populacional
Sphagnopsida/parasitologia
Zonas Úmidas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170709
[St] Status:MEDLINE


  5 / 2627 MEDLINE  
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[PMID]:28664704
[Au] Autor:Król-Turminska K; Olender A
[Ad] Endereço:Chair and Department of Medical Microbiology, Medical University of Lublin, Poland. katarzyna.k.krol@gmail.com.
[Ti] Título:Human infections caused by free-living amoebae.
[So] Source:Ann Agric Environ Med;24(2):254-260, 2017 May 11.
[Is] ISSN:1898-2263
[Cp] País de publicação:Poland
[La] Idioma:eng
[Ab] Resumo:[b]Abstract Introduction[/b]. Among free-living amoebae that are widely distributed in nature only four genera/species are known as agents of human infections:[i] Acanthamoeba spp., Naegleriafowleri, Balamuthia mandrillaris[/i] and[i] Sappiniapedata[/i]. These amoebae are not well adapted to parasitism, and could exist in the human environment without the need for a host. Infections due to these amoebae, despite low morbidity, are characterized by relatively high mortality rate and pose serious clinical problems. [b]Objectve[/b]. This review study presents and summarizes current knowledge about infections due to pathogenic and opportunistic free-living amoebae focused on epidemiology, clinical manifestations, diagnosis and treatment based on global literature. [b]State of knowledge[/b]. All four genera have been recognized as etiologic factors of fatal central nervous system infections and other serious diseases in humans. [i]N. fowleri[/i] causes an acute fulminating meningoencephalitis in children and young adults. [i]Acanthamoeba spp[/i]. and [i]B.mandrillaris[/i] are opportunistic pathogens causing granulomatous amoebic encephalitis and disseminated or localized infections which could affect the skin, sinuses, lungs, adrenals and/or bones. [i]Acanthamoeba spp[/i]. is also the main agent of acute eye infection -[i] Acanthamoeba keratitis, [/i]mostly in contact lens wearers. However, there is only one recognized case of encephalitis caused by [i]S. pedata. [/i] [b]Conclusions[/b]. Amoebic diseases are difficult to diagnose which leads to delayed treatment, and result in a high mortality rate. Considering those issues, there is an urgent need to draw more attention to this type of diseases.
[Mh] Termos MeSH primário: Amebíase/parasitologia
Amoeba/fisiologia
[Mh] Termos MeSH secundário: Amebíase/diagnóstico
Amebíase/epidemiologia
Amebíase/terapia
Amoeba/genética
Amoeba/isolamento & purificação
Animais
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170829
[Lr] Data última revisão:
170829
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170701
[St] Status:MEDLINE


  6 / 2627 MEDLINE  
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[PMID]:28606377
[Au] Autor:Levtova N; Healy LM; Gonczi CMC; Stopnicki B; Blain M; Kennedy TE; Moore CS; Antel JP; Darlington PJ
[Ad] Endereço:Department of Exercise Science, Concordia University, Montréal, QC H4B 1R6, Canada; PERFORM Centre, Concordia University, Canada; Center for Structural and Functional Genomics, Concordia University, Canada.
[Ti] Título:Comparative morphology and phagocytic capacity of primary human adult microglia with time-lapse imaging.
[So] Source:J Neuroimmunol;310:143-149, 2017 Sep 15.
[Is] ISSN:1872-8421
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Microglia provide immune surveillance within the brain and spinal cord. Various microglial morphologies include ramified, amoeboid, and pseudopodic. The link between form and function is not clear, especially for human adult microglia which are limited in availability for study. Here, we examined primary human microglia isolated from normal-appearing white matter. Pseudopodic and amoeboid microglia were effective phagocytes, taking up E. coli bioparticles using ruffled cell membrane sheets and retrograde transport. Pseudopodic and amoeboid microglia were more effective phagocytes as compared to ramified microglia or monocyte-derived dendritic cells. Thus, amoeboid and pseudopodic microglia may both be effective as brain scavengers.
[Mh] Termos MeSH primário: Amoeba/citologia
Microglia/fisiologia
Fagócitos/citologia
Fagócitos/fisiologia
Imagem com Lapso de Tempo
[Mh] Termos MeSH secundário: Actinas/metabolismo
Antígenos CD/metabolismo
Antígenos de Diferenciação Mielomonocítica/metabolismo
Infecções Bacterianas
Células Cultivadas
Proteínas de Ligação a DNA/metabolismo
Epilepsia/patologia
Escherichia coli/patogenicidade
Seres Humanos
Microglia/microbiologia
Microglia/patologia
Lobo Temporal/patologia
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (AIF1 protein, human); 0 (Actins); 0 (Antigens, CD); 0 (Antigens, Differentiation, Myelomonocytic); 0 (CD68 antigen, human); 0 (DNA-Binding Proteins)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170822
[Lr] Data última revisão:
170822
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170614
[St] Status:MEDLINE


  7 / 2627 MEDLINE  
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[PMID]:28539388
[Au] Autor:Titus MA; Goodson HV
[Ad] Endereço:Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN.
[Ti] Título:An evolutionary perspective on cell migration: Digging for the roots of amoeboid motility.
[So] Source:J Cell Biol;216(6):1509-1511, 2017 Jun 05.
[Is] ISSN:1540-8140
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Fritz-Laylin et al. (2017. https://doi.org/10.1083/jcb.201701074) take advantage of the deep knowledge of mechanisms of actin-based motility and a growing number of sequenced genomes across the tree of life to gain insight into the machinery needed for pseudopod-based amoeboid motility and how it evolved.
[Mh] Termos MeSH primário: Amoeba
Movimento Celular
[Mh] Termos MeSH secundário: Actinas
Evolução Biológica
Seres Humanos
Pseudópodes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actins)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171026
[Lr] Data última revisão:
171026
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170526
[St] Status:MEDLINE
[do] DOI:10.1083/jcb.201704112


  8 / 2627 MEDLINE  
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[PMID]:28390237
[Au] Autor:Wang H; Bédard E; Prévost M; Camper AK; Hill VR; Pruden A
[Ad] Endereço:State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: hongwang@tongji.edu.cn.
[Ti] Título:Methodological approaches for monitoring opportunistic pathogens in premise plumbing: A review.
[So] Source:Water Res;117:68-86, 2017 Jun 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Opportunistic premise (i.e., building) plumbing pathogens (OPPPs, e.g., Legionella pneumophila, Mycobacterium avium complex, Pseudomonas aeruginosa, Acanthamoeba, and Naegleria fowleri) are a significant and growing source of disease. Because OPPPs establish and grow as part of the native drinking water microbiota, they do not correspond to fecal indicators, presenting a major challenge to standard drinking water monitoring practices. Further, different OPPPs present distinct requirements for sampling, preservation, and analysis, creating an impediment to their parallel detection. The aim of this critical review is to evaluate the state of the science of monitoring OPPPs and identify a path forward for their parallel detection and quantification in a manner commensurate with the need for reliable data that is informative to risk assessment and mitigation. Water and biofilm sampling procedures, as well as factors influencing sample representativeness and detection sensitivity, are critically evaluated with respect to the five representative bacterial and amoebal OPPPs noted above. Available culturing and molecular approaches are discussed in terms of their advantages, limitations, and applicability. Knowledge gaps and research needs towards standardized approaches are identified.
[Mh] Termos MeSH primário: Água Potável/microbiologia
Engenharia Sanitária
[Mh] Termos MeSH secundário: Amoeba
Seres Humanos
Legionella pneumophila
Pseudomonas aeruginosa
Microbiologia da Água
Abastecimento de Água
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Drinking Water)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170409
[St] Status:MEDLINE


  9 / 2627 MEDLINE  
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[PMID]:28368313
[Au] Autor:Balczun C; Scheid PL
[Ad] Endereço:Laboratory of Medical Parasitology, Central Institute of the Bundeswehr Medical Service, Koblenz, Andernacherstrasse 100, 56070 Koblenz, Germany. carsten.balczun@rub.de.
[Ti] Título:Free-Living Amoebae as Hosts for and Vectors of Intracellular Microorganisms with Public Health Significance.
[So] Source:Viruses;9(4), 2017 Apr 01.
[Is] ISSN:1999-4915
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Free-living amoebae (FLA) are parasites within both humans and animals causing a wide range of symptoms and act as hosts of, and vehicles for phylogenetically diverse microorganisms, called endocytobionts. The interaction of the FLA with sympatric microorganisms leads to an exceptional diversity within FLA. Some of these bacteria, viruses, and even eukaryotes, can live and replicate intracellularly within the FLA. This relationship provides protection to the microorganisms from external interventions and a dispersal mechanism across various habitats. Among those intracellularly-replicating or -residing organisms there are obligate and facultative pathogenic microorganisms affecting the health of humans or animals and are therefore of interest to Public Health Authorities. Mimiviruses, Pandoraviruses, and Pithoviruses are examples for interesting viral endocytobionts within FLA. Future research is expected to reveal further endocytobionts within free-living amoebae and other protozoa through co-cultivation studies, genomic, transcriptomic, and proteomic analyses.
[Mh] Termos MeSH primário: Amoeba/microbiologia
Amoeba/virologia
Transmissão de Doença Infecciosa
Vetores de Doenças
[Mh] Termos MeSH secundário: Amoeba/parasitologia
Animais
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170404
[St] Status:MEDLINE


  10 / 2627 MEDLINE  
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[PMID]:28292672
[Au] Autor:Lizonová Z; Horsák M
[Ad] Endereço:Department of Botany and Zoology, Masaryk University, Kotlárská 2, 611 37 Brno, Czech Republic. Electronic address: zuzanag2@gmail.com.
[Ti] Título:Contrasting diversity of testate amoebae communities in Sphagnum and brown-moss dominated patches in relation to shell counts.
[So] Source:Eur J Protistol;58:135-142, 2017 Apr.
[Is] ISSN:1618-0429
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Ecological studies of peatland testate amoebae are generally based on totals of 150 individuals per sample. However, the suitability of this standard has never been assessed for alkaline habitats such as spring fens. We explored the differences in testate amoeba diversity between Sphagnum and brown-moss microhabitats at a mire site with a highly diversified moss layer which reflects the small-scale heterogeneity in groundwater chemistry. Relationships between sampling efficiency and sample completeness were explored using individual-based species accumulation curves and the effort required to gain an extra species was assessed. Testate amoeba diversity differed substantially between microhabitats, with brown mosses hosting on average twice as many species and requiring greater shell totals to reach comparable sample analysis efficiency as for Sphagnum. Thus, for samples from alkaline conditions an increase in shell totals would be required and even an overall doubling up to 300 individuals might be considered for reliable community description. Our small-scale data are likely not robust enough to provide an ultimate solution for the optimization of shell totals. However, the results proved that testate amoebae communities from acidic and alkaline environments differ sharply in both species richness and composition and they might call for different methodological approaches.
[Mh] Termos MeSH primário: Amoeba/classificação
Amoeba/fisiologia
Biodiversidade
Briófitas/parasitologia
Ecologia/métodos
Sphagnopsida/parasitologia
[Mh] Termos MeSH secundário: Ecossistema
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170413
[Lr] Data última revisão:
170413
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170316
[St] Status:MEDLINE



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