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aquatic microbiology

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https://www.readbyqxmd.com/read/28709108/vibrio-parahaemolyticus-and-v-alginolyticus-associated-meningo-encephalitis-in-a-bottlenose-dolphin-tursiops-truncatus-from-the-adriatic-coast-of-italy
#1
Ludovica Di Renzo, Gabriella Di Francesco, Chiara Profico, Cristina E Di Francesco, Nicola Ferri, Daniela Averaimo, Giovanni Di Guardo
A case of Vibrio parahaemolyticus- and V. alginolyticus-associated meningo-encephalitis in a bottlenose dolphin (Tursiops truncatus) found stranded along the Adriatic coast of Italy in 2016 is herein reported, along with a minireview on V. parahaemolyticus and V. alginolyticus infections in aquatic mammals. Macroscopically, two abscesses were found in the dolphin's forebrain, along with an extensive, bilateral, parasitic broncho-pneumonia. Histologically, a suppurative-to-pyogranulomatous meningo-encephalitis involved the brain but not the cerebellum...
July 1, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28663745/viromes-as-genetic-reservoir-for-the-microbial-communities-in-aquatic-environments-a-focus-on-antimicrobial-resistance-genes
#2
Stefano Colombo, Stefania Arioli, Eros Neri, Giulia Della Scala, Giorgio Gargari, Diego Mora
Despite studies of viromes isolated from aquatic environments are becoming increasingly frequent, most of them are limited to the characterization of viral taxonomy. Bacterial reads in viromes are abundant but the extent to which this genetic material is playing a role in the ecology of aquatic microbiology remains unclear. To this aim, we developed of a useful approach for the characterization of viral and microbial communities of aquatic environments with a particular focus on the identification of microbial genes harbored in the viromes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28658756/unusual-severe-extra-intestinal-manifestations-of-a-common-enteric-pathogen-aeromonas-spp
#3
Barnini Banerjee, Mridula Madiyal, Lingadakai Ramchandra, Chiranjay Mukhopadhyay, Rahul Garg, Kiran Chawla
INTRODUCTION: Aeromonas spp. are halophilic, Gram-negative bacilli. They are widely distributed in the soil and aquatic environment and have been associated with various extra-intestinal infections, such as skin and soft-tissue infections, meningitis, bacteraemia etc. The most common species associated with extra-intestinal infection is Aeromonas hydrophila. AIM: To get the overview of clinical presentations, underlying predisposing factors associated with the extra-intestinal infections caused by Aeromonas species and their antimicrobial susceptibility pattern...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658391/escherichia-coli-is-not-a-suitable-fecal-indicator-to-assess-water-fecal-contamination-by-otters
#4
M Oliveira, D Freire, N M Pedroso
The detection of pathogenic microorganisms in aquatic environments is extremely relevant in terms of public health. As these laboratorial methodologies are usually difficult, expensive and time-consuming, they are frequently replaced by the assessment of fecal indicator bacteria, such as Escherichia coli. This study aimed to assess the presence of E. coli in fecal samples from Neotropical otters, to evaluate its potential as fecal indicator to be applied to the determination of water microbiological quality in areas where otters' populations are high...
June 26, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28657887/lessons-from-the-environmental-antibiotic-resistome
#5
Matthew Surette, Gerard D Wright
Antibiotic resistance is a global public health issue of growing proportions. All antibiotics are susceptible to resistance. The evidence is now clear that the environment is the single largest source and reservoir of resistance. Soil, aquatic, atmospheric, animal- associated, and built ecosystems are home to microbes that harbor antibiotic resistance elements and the means to mobilize them. The diversity and abundance of resistance in the environment is consistent with the ancient origins of antibiotics and a variety of studies support a long natural history of associated resistance...
June 28, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28558234/sulfur-driven-iron-reduction-coupled-to-anaerobic-ammonium-oxidation
#6
Peng Bao, Guo-Xiang Li
A new biogeochemical pathway has been suggested to be present in terrestrial ecosystems, linking the nitrogen and iron cycles via ferric iron reduction coupled to anaerobic ammonium oxidation. However, the underlying microbiological process has not been demonstrated to date. Here we report a stable consortium, HJ-4, composed of Anaerospora hongkongensis (85%) and facultative anaerobe, Comamonadaceae (15%), which can process ferrihydrite reduction coupled to anaerobic ammonium oxidation driven by sulfur redox cycling...
June 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28555166/is-it-necessary-to-specifically-define-the-cause-of-surgically-treated-biliary-tract-infections-a-rare-case-of-raoultella-planticola-cholecystitis-and-literature-review
#7
Suat Can Ulukent, İnanc Samil Sarici, Nuri Alper Sahbaz, Yigit Mehmet Ozgun, Ozlem Akca, Kamuran Sanlı
Raoultella planticola is an aquatic and soil organism that does not notoriously cause invasive infections in humans. Infections in the literature are limited only in case reports. We present a very rare case of R. planticola cholecystitis. A 71-year-old female patient with abdominal pain was diagnosed with acute cholecystitis. Patient received intravenous antibiotic treatment, but the treatment failed and the patient underwent an open cholecystectomy. The final pathological result was gangrenous cholecystitis complicated with R...
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/28540556/the-use-of-bacterial-bioremediation-of-metals-in-aquatic-environments-in-the-twenty-first-century-a-systematic-review
#8
Feliphe Lacerda Souza de Alencar, Julio Alejandro Navoni, Viviane Souza do Amaral
Metal pollution is a current environmental issue as a consequence of unregulated anthropic activiy. A wide range of bioremediation strategies have been successfully implemented to recover contaminated areas. Among them, bacterial bioremediation stands out as a promising tool to confront these types of concerns. This study aimed to compare and discuss worldwide scientific evolution of bacterial potential for metal bioremediation in aquatic ecosystems. The study consisted of a systematic review, elaborated through a conceptual hypothesis model, during the period from 2000 to 2016, using PubMed, MEDLINE, and SciELO databases as data resources...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28523581/human-adenovirus-in-tissues-of-freshwater-snails-living-in-contaminated-waters
#9
J S Gularte, R Staggemeier, M Demoliner, T M S Heck, F H Heldt, R G F Ritzel, C Rigotto, A Henzel, F R Spilki
Human adenovirus (HAdV) is resistant to environment and can be used as a marker to detect fecal contamination. Considering the importance of freshwater snails in the aquatic environment, their use as concentrators for HAdV is a complementary tool for viral analysis of water. The goal of the study was to detect HAdV in snails and surface water collected from wetlands of the Sinos River (Rio Grande do Sul, Brazil) basin and to compare rates and viral loads found in both samples. HAdV was detected through real-time PCR...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28498940/contribution-of-aerobic-anoxygenic-phototrophic-bacteria-to-total-organic-carbon-pool-in-aquatic-system-of-subtropical-karst-catchments-southwest-china-evidence-from-hydrochemical-and-microbiological-study
#10
Qiang Li, Ang Song, Wenjie Peng, Zhenjiang Jin, Werner E G Müller, Xiaohong Wang
Aerobic anoxygenic phototrophic bacteria may play a particular role in carbon cycling of aquatic systems. However, little is known about the interaction between aerobic anoxygenic phototrophic bacteria and hydrochemistry in groundwater-surface water exchange systems of subtropical karst catchments. We carried out a detailed study on the abundance of aerobic anoxygenic phototrophic bacteria and bacterioplankton, hydrochemistry and taxonomy of bacterioplankton in the Maocun watershed, Southwest China, an area with karst geological background...
June 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28458656/change-in-the-structure-of-escherichia-coli-population-and-the-pattern-of-virulence-genes-along-a-rural-aquatic-continuum
#11
Fabienne Petit, Olivier Clermont, Sabine Delannoy, Pierre Servais, Michèle Gourmelon, Patrick Fach, Kenny Oberlé, Matthieu Fournier, Erick Denamur, Thierry Berthe
The aim of this study was to investigate the diversity of the Escherichia coli population, focusing on the occurrence of pathogenic E. coli, in surface water draining a rural catchment. Two sampling campaigns were carried out in similar hydrological conditions (wet period, low flow) along a river continuum, characterized by two opposite density gradients of animals (cattle and wild animals) and human populations. While the abundance of E. coli slightly increased along the river continuum, the abundance of both human and ruminant-associated Bacteroidales markers, as well as the number of E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28447615/millions-of-boreal-shield-lakes-can-be-used-to-probe-archaean-ocean-biogeochemistry
#12
S L Schiff, J M Tsuji, L Wu, J J Venkiteswaran, L A Molot, R J Elgood, M J Paterson, J D Neufeld
Life originated in Archaean oceans, almost 4 billion years ago, in the absence of oxygen and the presence of high dissolved iron concentrations. Early Earth oxidation is marked globally by extensive banded iron formations but the contributing processes and timing remain controversial. Very few aquatic habitats have been discovered that match key physico-chemical parameters of the early Archaean Ocean. All previous whole ecosystem Archaean analogue studies have been confined to rare, low sulfur, and permanently stratified lakes...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28417144/the-effect-of-reconstruction-works-on-planktonic-bacterial-diversity-of-a-unique-thermal-lake-revealed-by-cultivation-molecular-cloning-and-next-generation-sequencing
#13
Gergely Krett, Attila Szabó, Tamás Felföldi, Károly Márialigeti, Andrea K Borsodi
The aim of this study was to gain detailed information about the diversity of planktonic bacterial communities of a worldwide special peat bedded natural thermal spa lake, and to reveal the effect of a lake wall reconstruction work. To compare the efficiency of different methods used for analyzing bacterial diversity, cultivation, molecular cloning and pyrosequencing were applied simultaneously. Despite the almost unchanged physical-chemical parameters and cell count values of lake water, remarkable differences were observed in the planktonic bacterial community structures during and after the reconstruction by all applied microbiological approaches...
April 17, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28364400/impact-of-raking-and-bioturbation-mediated-ecological-manipulation-on-sediment-water-phosphorus-diagenesis-a-mesocosm-study-supported-with-radioactive-signature
#14
Jayanta K Biswas, Saumen Hazra, Jayjit Majumdar, Sushil K Mandal, Sabry M Shaheen, Santosh K Sarkar, Ralph Meissner, Erik Meers, Jörg Rinklebe
The study examined the impact of raking and fish bioturbation on modulating phosphorus (P) concentrations in the water and sediment under different trophic conditions. An outdoor experiment was set to monitor physicochemical and microbiological parameters of water and sediment influencing P diagenesis. A pilot study with radioactive (32)P was also performed under the agency of raking and bacteria (Bacillus sp.). Raking was more effective in release of P under unfertilized conditions by significantly enhancing orthophosphate (35%) and soluble reactive phosphate (31...
March 31, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28334157/overview-of-freshwater-microbial-eukaryotes-diversity-a-first-analysis-of-publicly-available-metabarcoding-data
#15
Didier Debroas, Isabelle Domaizon, Jean-Francois Humbert, Ludwig Jardillier, Cécile Lepère, Anne Oudart, Najwa Taïb
Although they are widespread, diverse and involved in biogeochemical cycles, microbial eukaryotes attract less attention than their prokaryotic counterparts in environmental microbiology. In this study, we used publicly available 18S barcoding data to define biases that may limit such analyses and to gain an overview of the planktonic microbial eukaryotic diversity in freshwater ecosystems. The richness of the microbial eukaryotes was estimated to 100 798 operational taxonomic units (OTUs) delineating 1267 clusters or phylogenetic units (PUs, i...
April 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28290555/microbial-communities-of-aquatic-environments-on-heard-island-characterized-by-pyrotag-sequencing-and-environmental-data
#16
Michelle A Allen, Ricardo Cavicchioli
Heard Island in the Southern Ocean is a biological hotspot that is suffering the effects of climate change. Significant glacier retreat has generated proglacial lagoons, some of which are open to the ocean. We used pyrotag sequencing of SSU rRNA genes and environmental data to characterize microorganisms from two pools adjacent to animal breeding areas, two glacial lagoons and Atlas Cove (marine site). The more abundant taxa included Actinobacteria, Bacteroidetes and Proteobacteria, ciliates and picoflagellates (e...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271855/prevalence-of-foodborne-pathogens-in-food-from-selected-african-countries-a-meta-analysis
#17
REVIEW
Narayan Paudyal, Victor Anihouvi, Joseph Hounhouigan, Maitshwarelo Ignatius Matsheka, Bonno Sekwati-Monang, Wisdom Amoa-Awua, Amy Atter, Nina Bernice Ackah, Samuel Mbugua, Agnes Asagbra, Warda Abdelgadir, Jesca Nakavuma, Mogens Jakobsen, Weihuan Fang
Food safety information in the African region is insufficient and fragmented due to lack of surveillance, documentation and reporting, thereby resulting in inefficient utilization of resources, duplication of activities, and lack of synergy among the countries of the region. This paper reviews the prevalence of foodborne pathogens in seven African countries (Benin, Botswana, Ghana, Kenya, Nigeria, Sudan and Uganda) from papers in regional or international journals published between January 2000 and December 2015...
March 6, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28207310/microbiological-quality-and-prevalence-of-%C3%AE-lactam-antibiotic-resistance-genes-in-oysters-crassostrea-rhizophorae
#18
Maria Aparecida da RessurreiÇão Brandão, Amanda Teixeira Sampaio Lopes, Maria Tereza da Silva Neta, Rhyan Barros Farias de Oliveira, Rachel Passos Rezende, George Rêgo Albuquerque, Verônica Dias Gonçalves, Dália Dos Prazeres Rodrigues, Guisla Boehs, Bianca Mendes Maciel
The microbiological quality of oysters reflects the microbiological quality of their habitats because they are filter feeders. The objective of this study was to assess the bacterial composition of the edible oyster Crassostrea rhizophorae in urban and preserved estuaries. Particularly, we assessed the presence of pathogenic bacteria, investigated antibiotic susceptibility in bacterial isolates, and quantified β-lactam antibiotic resistance genes (blaTEM, blaSHV, and blaKPC) via quantitative PCR of oyster DNA...
March 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28117550/abundant-carbon-substrates-drive-extremely-high-sulfate-reduction-rates-and-methane-fluxes-in-prairie-pothole-wetlands
#19
Paula Dalcin Martins, David W Hoyt, Sheel Bansal, Christopher T Mills, Malak Tfaily, Brian A Tangen, Raymond G Finocchiaro, Michael D Johnston, Brandon C McAdams, Matthew J Solensky, Garrett J Smith, Yu-Ping Chin, Michael J Wilkins
Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of the highest concentrations of dissolved organic carbon (DOC) and sulfur species ever recorded in terrestrial aquatic environments...
January 24, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28114378/frna-bacteriophages-as-viral-indicators-of-faecal-contamination-in-mexican-tropical-aquatic-systems
#20
Luis Jose Rene Arredondo-Hernandez, Carlos Diaz-Avalos, Yolanda Lopez-Vidal, Gonzalo Castillo-Rojas, Marisa Mazari-Hiriart
A particular challenge to water safety in populous intertropical regions is the lack of reliable faecal indicators to detect microbiological contamination of water, while the numerical relationships of specific viral indicators remain largely unexplored. The aim of this study was to investigate the numerical relationships of FRNA-bacteriophage genotypes, adenovirus 41, and human adenoviruses (HADV) in Mexican surface water systems to assess sewage contamination. We studied the presence of HADV, HADV41 and FRNA bacteriophage genotypes in water samples and quantified by qPCR and RT-qPCR...
2017: PloS One
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