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Applied Sciences
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New Frontiers into Environmental Microbiology
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New Frontiers into Environmental Microbiology

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: closed (20 August 2022) | Viewed by 5532

Special Issue Editors

Dr. Pilar García-Jiménez

E-Mail Website
Guest Editor
Department of Biology, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas, Spain
Interests: reproduction; red seaweed; sulphated compounds; volatiles; gene expression; microbiology: bioindicators; bacteria; 16 s RNA; bacterial communities; biotechnological applications
Dr. Marina Carrasco-Acosta

E-Mail Website1 Website2
Guest Editor
Department of Biology, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas, Spain
Interests: environmental microbiology; microbial molecular biology; biotechnological applications; marine fungi; bacteria communities; bioindicators; water quality

Special Issue Information

Dear Colleagues,

Alterations of the aquatic environment have an impact on human health, economy, and the environment itself.  Impacts are apparent when considering the risks of polymer presence, and the consequence of polluted water discharges, among others. In this context, microorganism significance lies in understanding on how they behave as potential drivers of biodegradation of polymers, as bioindicators of quality of water and sediments, and in the comprehension of interactions of foreign and resistant microorganisms, from  discharged water, on receiving water bodies, sediments, and existing microbial communities. Microbiological effects on water bodies and sediments are valued through different approaches such as in vitro studies, (meta) genomic analysis, and fecal pollution source tracking methods.

A collection of papers exploring different microorganism roles will be welcome. Specific topics on water quality, in vitro approaches such as artificial surface colonization by bacteria, microbial processes and interactions between microbial communities and others such as algae and seagrasses will also be of interest. We encourage studies based on genome and other disciplinary studies focused on both basic and applied research.

Dr. Pilar García-Jiménez
Dr. Marina Carrasco-Acosta
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • bacteria
  • biofilms
  • colonization
  • marine and freshwater ecosystems
  • microorganism communities
  • phylogenesis
  • water quality

Published Papers (3 papers)

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Research

13 pages, 1482 KiB  
Article
Marine Bacteria Associated with Colonization and Alteration of Plastic Polymers
by Marina Carrasco-Acosta, Marta Santos-Garcia and Pilar Garcia-Jimenez
Appl. Sci. 2022, 12(21), 11093; https://doi.org/10.3390/app122111093 - 1 Nov 2022
Viewed by 1264
Abstract
The aim of this work was molecular identification of bacteria associated with marine sand at the drift line, where most plastic debris is deposited, and evaluation of the alteration of plastic polymers by them. Bacterial communities growing on plastic polymer surfaces may differentially [...] Read more.
The aim of this work was molecular identification of bacteria associated with marine sand at the drift line, where most plastic debris is deposited, and evaluation of the alteration of plastic polymers by them. Bacterial communities growing on plastic polymer surfaces may differentially cause surface alteration through exopolysaccharide production. This alteration can be analyzed by changes in spectra regions of colonized polymers compared to uncolonized polymers using Fourier Transform Infrared Spectroscopy (FTIR). In this study, bacteria located in sand at the drift line above sea water, where microplastics are most abundant, were isolated and identified through 16S rRNA. Six of the identified species produced exopolysaccharides, namely Bacillus thuringiensis, B. cereus, Bacillus sp. Proteus penneri, Alcaligenes faecalis and Myroides gitamensis. These bacteria species were inoculated into plates, each containing two frequently reported types of polymers at the drift line. Specifically, the two types of plastic polymers used were polypropylene and polystyrene spheres in whole and mechanically crushed states. Differences in bacterial growth were reported as inferred from weight increase of polypropylene and polystyrene spheres after 1-year long culture. Results also showed that Alcaligenes faecalis, Bacillus cereus and Proteus penneri colonized polypropylene spheres and modified spectra regions of FTIR. It is concluded that bacteria located in sand can be considered plastic-altering bacteria as changes in FTIR-spectra of polymers can be related to bioalteration. Full article
(This article belongs to the Special Issue New Frontiers into Environmental Microbiology)
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11 pages, 1960 KiB  
Article
Persistent Spatial Patterns of Listeria monocytogenes and Salmonella enterica Concentrations in Surface Waters: Empirical Orthogonal Function Analysis of Data from Maryland
by Seongyun Kim, Manashi Paul, Masoud Negahban-Azar, Shirley A. Micallef, Rachel E. Rosenberg Goldstein, Fawzy Hashem, Salina Parveen, Amir Sapkota, Kalmia Kniel, Amy R. Sapkota, Yakov Pachepsky and Manan Sharma
Appl. Sci. 2022, 12(15), 7526; https://doi.org/10.3390/app12157526 - 26 Jul 2022
Cited by 2 | Viewed by 1762
Abstract
High spatiotemporal variability of pathogen concentrations in surface waters complicates the design and interpretation of microbial water quality monitoring. Empirical orthogonal function (EOF) analysis can provide spatial patterns (EOFs) of variability in deviations of concentrations in specific locations from the average concentration across [...] Read more.
High spatiotemporal variability of pathogen concentrations in surface waters complicates the design and interpretation of microbial water quality monitoring. Empirical orthogonal function (EOF) analysis can provide spatial patterns (EOFs) of variability in deviations of concentrations in specific locations from the average concentration across the study area. These patterns can be interpreted to assess the effect of environmental factors on pathogen levels in the water. The first and the second EOFs for Listeria monocytogenes explained 84.4% and 9.7% of the total variance of deviations from average, respectively. That percentage was 50.8% and 45.0% for Salmonella enterica. The precipitation also had a strong explanatory capability (79%) of the first EOF. The first EOFs of Listeria and precipitation were similar at pond sites but were opposite to the precipitation at the stream sites. The first EOF of S. enterica and precipitation demonstrated opposite trends, whereas the second S. enterica EOF pattern had similar signs with the precipitation EOF at pond sites, indicating a relationship between rainfall and Salmonella at these sites. Overall, the rainfall data could inform on persistent spatial patterns in concentrations of the two pathogens at the pond sites in farm settings but not at stream sites located in forested areas. Full article
(This article belongs to the Special Issue New Frontiers into Environmental Microbiology)
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9 pages, 1430 KiB  
Article
Isolation of Jannaschia sedimins sp. nov. from East Coast of China: Bacterial Taxonomy and Antimicrobial Resistance Analysis
by Sha Sha, Shuqian Li, Lihua Zhao, Jinxin Zhao and Guanjun Chen
Appl. Sci. 2022, 12(6), 2883; https://doi.org/10.3390/app12062883 - 11 Mar 2022
Viewed by 1520
Abstract
A Gram-stain-negative, facultatively aerobic, pink and oval bacterium, designed OS4T, was isolated from a sediment sample taken from a coastal zone in China. The growth of OS4T occurred at 20–37 °C (optimal 25 °C), pH 7.0–8.5 (optimal pH 8.0), in [...] Read more.
A Gram-stain-negative, facultatively aerobic, pink and oval bacterium, designed OS4T, was isolated from a sediment sample taken from a coastal zone in China. The growth of OS4T occurred at 20–37 °C (optimal 25 °C), pH 7.0–8.5 (optimal pH 8.0), in 0–5.0% (w/v) NaCl (optimal 2.0%). According to the phylogenetic analysis, strain OS4T showed the highest sequence similarity (96.04%) with Jannaschia aquimarina GSW-M26T and shared 94.98% similarity with the type species of genus Jannaschia-strain J. helgolandensis 14858T. Chemotaxonomic analysis showed that the sole respiratory quinone was ubiquinone 10, and the major fatty acids (>5.0%) included C18:1 ω6c/ω7c, C18:0, and C10:0 3OH. The polar lipids consist of three phospholipids, two unknown amino-lipids, and four unknown glycerolipids. The DNA G + C content was 72.7 mol%. Based on the evidence presented in this study, strain OS4T represents a novel species of the genus Jannaschia, for which the name Jannaschia sedimins sp. nov. is proposed. The type strain is OS4T (=KCTC 82508T = MCCC 1K03755T). Both the phenotypic and the genetic analysis on the antimicrobial resistance genes indicate that OS4T is resistant to a wide range of classes of antibiotics, which highlights that the ocean could potentially serve as the natural reservoir of antimicrobial resistance genes. Full article
(This article belongs to the Special Issue New Frontiers into Environmental Microbiology)
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