Transformation of N and S pollutants and characterization of microbial communities in constructed wetlands with Vallisneria natans

2021 ◽  
Vol 42 ◽  
pp. 102186
Author(s):  
Feichao Fu ◽  
Shaobin Huang ◽  
Heping Hu ◽  
Yao Lu ◽  
Yanlin Wang ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Constructed Wetlands ◽  
Vallisneria Natans

scholarly journals Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands

2018 ◽  
Author(s):  
Carlos A. Ramírez-Vargas ◽  
Carlos A. Arias ◽  
Liang Zhang ◽  
Hans Brix
Keyword(s):  
Microbial Communities ◽  
Constructed Wetlands ◽  
Petroleum Coke ◽  
Performance Enhancement ◽  
Carbon Sources ◽  
Spatial Dynamics ◽  
Community Function ◽  
Microbial Characterization ◽  
Calcined Petroleum Coke

Abstract. The performance enhancement of constructed wetlands can be achieved through the coupling with microbial electrochemical technologies (MET). MET is a setup designed to mimic metabolic electrons exchange with insoluble donors and acceptors with the aid of electroactive bacteria and external electrical circuits. An alternative MET that dispenses of electrodes and circuits but uses an electro-conductive biofilter is called Microbial Electrochemical-based Constructed Wetland (METland). Previously it has been demonstrated that a METland has higher biodegradation rates than horizontal flow constructed wetlands, however given its novelty there are still uncertainties related to the removal of pollutants, including their microbial activity. The genetic characterization of microbial communities of a METland is desirable, but is time and resource consuming, then a characterization alternative could be based on functional analysis of the microbial communities. Community-level physiological profile (CLPP) is a useful method to evaluate the functional diversity of microbial communities based on the carbon source utilization pattern (CSUP). Therefore, this study was focused on the microbial characterization of laboratory scale METland based on CLPP analysis. The study included the characterization of microbial communities attached to two carbon-based electro-conductive materials (calcined petroleum coke from crushed electrodes – PK-A; calcined petroleum coke with low sulphur and nitrogen content – PK-LSN), in planted and non-planted set-ups. Variations on the metabolic activity of tested systems were identified and it seems to be related to the characteristics of the material, rather than the presence/absence of plants. In general, CSUP show differences along flow pathway, as well as among the tested systems, being carbohydrates and carboxylic/acetic acids the most consumed carbon sources, followed by polymers, amides/amines and amino acids. Also, were established some correlations between the utilization of carbon sources and the removal of pollutants. The obtained results provide useful insight into the spatial dynamics of METland systems.

scholarly journals Isolation and characterization of microbial communities from a constructed wetlands system: A case study in Tunisia

2014 ◽  
Vol 8 (6) ◽  
pp. 529-538 ◽  
Author(s):  
Houda Nasr ◽  
Hanene Cherif ◽  
Ines Mehri ◽  
said Myriam Ben ◽  
Imen Daly ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Constructed Wetlands ◽  
System A ◽  
Isolation And Characterization

scholarly journals Metagenomic Characterization of Microbial Communities In Situ Within the Deeper Layers of the Ileum in Crohn’s Disease

2016 ◽  
Vol 2 (5) ◽  
pp. 563-566.e5 ◽  
Author(s):  
Chandra Sekhar Pedamallu ◽  
Ami S. Bhatt ◽  
Susan Bullman ◽  
Sharyle Fowler ◽  
Samuel S. Freeman ◽  
...  
Keyword(s):  
Crohn’S Disease ◽  
Crohn's Disease ◽  
Microbial Communities

scholarly journals Characterization of Ocular Surface Microbial Profiles Revealed Discrepancies between Conjunctival and Corneal Microbiota

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 405
Author(s):  
Anna Matysiak ◽  
Michal Kabza ◽  
Justyna A. Karolak ◽  
Marcelina M. Jaworska ◽  
Malgorzata Rydzanicz ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Ocular Surface ◽  
Molecular Techniques ◽  
Corneal Tissue ◽  
Rna Seq ◽  
Microbiome Composition ◽  
Viral Sequences ◽  
Pcr Techniques ◽  
Unmapped Reads

The ocular microbiome composition has only been partially characterized. Here, we used RNA-sequencing (RNA-Seq) data to assess microbial diversity in human corneal tissue. Additionally, conjunctival swab samples were examined to characterize ocular surface microbiota. Short RNA-Seq reads, obtained from a previous transcriptome study of 50 corneal tissues, were mapped to the human reference genome GRCh38 to remove sequences of human origin. The unmapped reads were then used for taxonomic classification by comparing them with known bacterial, archaeal, and viral sequences from public databases. The components of microbial communities were identified and characterized using both conventional microbiology and polymerase chain reaction (PCR) techniques in 36 conjunctival swabs. The majority of ocular samples examined by conventional and molecular techniques showed very similar microbial taxonomic profiles, with most of the microorganisms being classified into Proteobacteria, Firmicutes, and Actinobacteria phyla. Only 50% of conjunctival samples exhibited bacterial growth. The PCR detection provided a broader overview of positive results for conjunctival materials. The RNA-Seq assessment revealed significant variability of the corneal microbial communities, including fastidious bacteria and viruses. The use of the combined techniques allowed for a comprehensive characterization of the eye microbiome’s elements, especially in aspects of microbiota diversity.

Molecular characterization of microbial communities in deep coal seam groundwater of northern Japan

Geobiology ◽  
2007 ◽  
Vol 5 (4) ◽  
pp. 423-433 ◽  
Author(s):  
S. SHIMIZU ◽  
M. AKIYAMA ◽  
T. NAGANUMA ◽  
M. FUJIOKA ◽  
M. NAKO ◽  
...  
Keyword(s):  
Coal Seam ◽  
Microbial Communities ◽  
Molecular Characterization ◽  
Northern Japan

Characterization of microbial communities and fungal metabolites on field grown strawberries from organic and conventional production

2013 ◽  
Vol 160 (3) ◽  
pp. 313-322 ◽  
Author(s):  
Birgit Jensen ◽  
Inge M.B. Knudsen ◽  
Birgitte Andersen ◽  
Kristian Fog Nielsen ◽  
Ulf Thrane ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Fungal Metabolites ◽  
Conventional Production

scholarly journals Assessing high-throughput environmental DNA extraction methods for meta-barcode characterization of aquatic microbial communities

2018 ◽  
Vol 17 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Abdolrazagh Hashemi Shahraki ◽  
Subba Rao Chaganti ◽  
Daniel Heath
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
High Throughput ◽  
Environmentally Friendly ◽  
Environmental Dna ◽  
Magnetic Bead ◽  
Extraction Methods ◽  
Environmental Research ◽  
Rrna Gene

Abstract The characterization of microbial community dynamics using genomic methods is rapidly expanding, impacting many fields including medical, ecological, and environmental research and applications. One of the biggest challenges for such studies is the isolation of environmental DNA (eDNA) from a variety of samples, diverse microbes, and widely variable community compositions. The current study developed environmentally friendly, user safe, economical, and high throughput eDNA extraction methods for mixed aquatic microbial communities and tested them using 16 s rRNA gene meta-barcoding. Five different lysis buffers including (1) cetyltrimethylammonium bromide (CTAB), (2) digestion buffer (DB), (3) guanidinium isothiocyanate (GITC), (4) sucrose lysis (SL), and (5) SL-CTAB, coupled with four different purification methods: (1) phenol-chloroform-isoamyl alcohol (PCI), (2) magnetic Bead-Robotic, (3) magnetic Bead-Manual, and (4) membrane-filtration were tested for their efficacy in extracting eDNA from recreational freshwater samples. Results indicated that the CTAB-PCI and SL-Bead-Robotic methods yielded the highest genomic eDNA concentrations and succeeded in detecting the core microbial community including the rare microbes. However, our study recommends the SL-Bead-Robotic eDNA extraction protocol because this method is safe, environmentally friendly, rapid, high-throughput and inexpensive.

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