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International Biodeterioration & Biodegradation
Elsevier
International Biodeterioration & Biodegradation

Elsevier

0964-8305

International Biodeterioration & Biodegradation/Journal International Biodeterioration & BiodegradationAHCIISTPSCI
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    Shewanella oneidensis MR-1 accelerates the corrosion of carbon steel using multiple electron transfer mechanisms

    Hernandez-Santana A.Nanny M.A.Suflita J.M.
    9页
    查看更多>>摘要：? 2022 Elsevier LtdDespite increasing interest in corrosion caused by direct electron transfer (DET) from steel surfaces to microbial cells, the validity of this mechanism is debated. This is often because of the inability to differentiate between the extent of corrosion due to DET and the microbial consumption of H2. Shewanella oneidensis is linked to corrosion of steel and capable of engaging in extracellular electron transfer and consuming H2. However, it is not clear how S. oneidensis corrodes steel. We tested the ability of S. oneidensis to corrode carbon steel through a DET mechanism independently from its H2-consuming capabilities by performing anaerobic corrosion experiments of carbon steel with an S. oneidensis strain incapable of consuming H2 (ΔhydAΔhyaB) and a strain unable to engage in DET (ΔMtr). We found that S. oneidensis accelerates the steel corrosion rate by up to four times relative to an abiotic control and corrosion is coupled to the reduction of fumarate to succinate. More localized corrosion and higher cell density on the steel surface is observed when cells are restricted to DET alone than when only H2 consumption is operational. Coupon weight loss and Linear Polarization Resistance measurements show that the wild-type strain preferentially used the DET mechanism to corrode steel under anoxic conditions. This study illustrates the use of mutant strains as an experimental approach to distinguish DET from H2-mediated electron transfer.
      原文链接:
    • NSTL
    • Elsevier

    Antibiofilm activity of secondary metabolites from bacterial endophytes of Red Sea soft corals

    Abdulrahman I.Jamal M.T.Pugazhendi A.Satheesh S....
    14页
    查看更多>>摘要：? 2022 Elsevier LtdEndophytic marine bacteria are a significant unexplored resource for the search of new compounds with antifouling activity. In this study, endophytic marine bacteria isolated from Red Sea soft corals were subjected to secondary metabolites extraction and evaluation of the extracts for the antibiofilm activity to reveal compounds that can prevent biofilm bacterial colonization on surfaces. Six bacteria were isolated from two species of soft corals: Sarcophyton glaucum and Heteroxenia fuscescens. Extracts obtained from each strain were screened for antibiofilm activity against three biofilm-forming bacteria and evaluated to detect compounds with antibiofilm properties by Gas chromatography-mass spectrometry (GC-MS). The isolated strains are closely related and belong to the family Bacillaceae and all except one belong to the Bacillus genus. The extracts from the endophytes show significant antibacterial activity against the tested organisms. Biofilm formation inhibition activity of the extracts ranges from 3.16 to 98.41%. The extracts also showed significant activity against biofilm formation across all the tested strains. Compounds detected in the extracts include known compounds with antibiofilm properties such as 2,4-dimethyl-2-nitro-, 2,4-bis(1,1-dimethylethyl)-phenol, Pyrrolo[1,2-a] pyrazine-1,4-dione, hexahydro-3-(2-methylpropyl)-; Bis(tridecyl) phthalate, Heinecosane, Pentane, and Undecane.This indicates the ability of the bacteria to produce compounds relevant in preventing biofilm colonization on surfaces which could serve as a novel source of antifouling compounds.
      原文链接:
    • NSTL
    • Elsevier

    Fungal communities differ with microplastic types in deep sea sediment enrichments of the Eastern Pacific

    Yang S.Xu W.Zhang K.Hu J....
    9页
    查看更多>>摘要：? 2022 Elsevier LtdIn this study, we used three plastic powders (polystyrene (PS), polyethylene terephthalate (PET) and polyurethane (PU)) to conduct micro-enrichments with deep-sea sediments from the Eastern Pacific. High-throughput sequencing of the ITS marker gene was performed during the enrichment process. The results showed that in comparison to culture time, plastic type significantly influenced the richness and diversity of the associated fungal community. The fungal community structures in PS and PET enrichments were similar, and there was no significant difference in fungal β diversity. Culture time, however, did not have any significant impact on the fungal community. On the other hand, based on FUNGuild analysis, we revealed that the fungal community compositions in PS and PET samples were highly similar, whereas PU enrichment was very different. The OTU network indicated more interactions between the different OTUs in the PU-enriched samples, demonstrating a highly complex interaction network. Fungal abundance, however, was not significantly affected by plastic type or culture time. In conclusion, compared to the original deep-sea sediments, addition of microplastics results in changes of the fungal community structure. Furthermore, different plastic types lead to different fungal communities, and compared with PS and PET, the enrichment effect of PU was stronger. Finally, rather than culture time, plastic type has a significant impact on fungal diversity and community composition.
      原文链接:
    • NSTL
    • Elsevier

    Stratification of microbial communities and their functions in mossy biofilms colonizing the giant monolithic statue of buddha

    Liu P.-K.Bai F.-Y.Lu Y.-S.He C.-Q....
    9页
    查看更多>>摘要：? 2022Moss-microbial biofilm is an important topic for the biodeterioration of sandstone heritages. However, the processes that biofilms colonize and erode sandstone heritages should be better defined. We divided mosses into three strata perpendicular to the sandstone face in the direction from the atmosphere to the sandstone surface (the upper layer, the middle layer, and the lower layer) to explore the mechanisms involved. The results showed that the bacteria in various layers of moss exhibited a distinct layered pattern of nutrient strategies. The bacteria in the upper layer were mostly photoautotrophic (e.g., Cyanobacteria, WPS-2, etc.) and methylotrophic bacteria (e.g., Methylobacterium-Methylorubrum, Sphingomonas, etc.). The bacteria in the lower layer were primarily heterotrophic as special Actinobacteria with the ability of weathering (e.g., Actinomycetospora, Nocardioides, etc.). Particularly, the potential acid condition in the lower layer would promote the growth of acidophilic bacteria (e.g., Acidipila, Acidiphilium, etc.) and acidophilic iron-reducing bacteria (e.g., Acidiphilium, Acidicaldus, etc.), which deteriorate the alkaline cement and ferric oxides. Furthermore, nucleotide sequences associated with the Calvin-Benson-Bassham cycle, methanol utilization (methanol dehydrogenase), nitrogen fixation (nitrogenase), and ammonia oxidation (ammonia monooxygenase) were more prevalent in the upper layer of bacterial communities. The nucleotide sequences related to the reductive tricarboxylic acid cycle, reduced acetyl-CoA pathway, decomposition of organic carbon (β-1,4-glucosidase), and organic nitrogen (β-N-acetyl glucosaminidase) were more abundant in the lower layer. Therefore, in addition to the damage to the moss itself, we should pay more attention to the microorganisms that live in symbiosis with it. Our study shows that the strategy of stratified colonization of microorganisms would supply the nutrients available for moss-microbial biofilm, the formation of which would in turn deteriorate sandstone heritages.
      原文链接:
    • NSTL
    • Elsevier

    Hyperspectral imaging and directional reflectance for predicting interaction of laser radiation with biodeteriorated objects threatening human health

    Rybitwa D.Wawrzyk A.Lobacz M.Machoy M....
    11页
    查看更多>>摘要：? 2022 Elsevier LtdThe aim of this study was an attempt to use hyperspectral imaging and hemispheric directional reflectance, supported by GLCM and quadtree decomposition methods, for non-invasive analysis of historical objects. The research was carried out to adjust the wavelength of laser light, which could be used for decontamination, to the characteristics of historical materials from the Auschwitz-Birkenau State Museum. Historical leathers and fabrics from original children's shoes are contaminated with bacteria at the level of 105–106 CFU/100 cm2 and 104 CFU/100 cm2 with fungi, on average, including microorganisms posing threat to the objects and people. Two proposed methods allowed for a quantitative, repeatable and absolute assessment of interaction of electromagnetic radiation with tested materials. The dependence of reflectance on the wavelength was roughly similar for all materials, i.e. slight fluctuations or gradual increase in the spectral range of 400–700 nm, then increase for 700–1700 nm and a decrease for 1700–2500 nm. In general, higher reflectance was recorded for historical fabrics than for historical leathers. The most suitable range of laser radiation for disinfection was set at 700–1000 nm. Irradiation with a diode laser (λ = 808 nm) caused statistically significant differences in the numbers of all tested microbial strains and reduction by 56.03–99.10%.
      原文链接:
    • NSTL
    • Elsevier

    Magnesium isotope fractionation during carbonate precipitation associated with bacteria and extracellular polymeric substances

    Zhang C.Li F.
    9页
    查看更多>>摘要：? 2022 Elsevier LtdMagnesium (Mg) is abundant on Earth's surface aquatic environments and plays an important role during the precipitation of biogenic CaCO3 minerals. Moreover, Mg isotopes are increasingly used to study a number of bio-induced mineralization processes of calcite. In this study, Mg isotope signatures during calcite and aragonite precipitation in the presence of Curvibacter sp. HJ-1 and of their extracellular polymeric substances (EPS) were investigated and the evolution of mineralogical and liquid composition were tracked over time. The results showed that light Mg isotopes were preferentially incorporated into the precipitated solids in all the experiments with and without bacteria. Significant Mg isotope fractionation was associated with the transformation of amorphous calcium carbonate (ACC) to crystal carbonate (Δ26Mgcrystals-ACC = ?0.9‰ and ?0.7‰ in biotic and EPS experiments, respectively), and obvious Mg isotope fractionation was noted between solids and liquid (Δ26Mgsolid-liquid achieved ?2.2‰ and ?2.0‰ in biotic and EPS experiments, respectively). Besides, δ26Mg values were significantly correlated with pH, Mg content in liquid and solid, bacterial density and presence of EPS in biotic experiments. These findings indicated that strain HJ-1 had an effect on Mg isotope fractionation during calcite and aragonite precipitation. The difference in Mg isotope fractionation may be a new tool for understanding the biologically mediated effects on Mg-bearing carbonate precipitation, and serves as a useful alternative for aqueous Mg isotope, which is vital for reconstructing past environmental changes.
      原文链接:
    • NSTL
    • Elsevier

    The environmental factors used in correlation analysis with microbial community of environmental and cultural heritage samples

    Chen J.Gu J.-D.
    4页
    查看更多>>摘要：? 2022 Elsevier LtdNucleotide sequences and genomics data are increasing used in analysis of microbial characteristics in community composition and diversity for a wide range of samples. At the same time, correlation analysis is used in an effort to make connection to the non-biological factors, including physical and chemical ones, in shaping the microbiome. Chemical analysis of environmental samples of soils and sediments is a routine procedure to obtain the concentrations of various chemical nutrients in 2M KCl extract which are widely reported in papers, but a better and a more meaningful practice is to use porewater of the samples for the chemical analysis if possible. In a similar way, meteorological data of the ambient conditions are used for correlation analysis with the microbiome on outdoor cultural heritage, but the in situ variables of the heritage objects are rarely measured at the time of sampling with a genuine effort. For cultural heritage, the intricate interactions between temperature and humidity of the ambient environment are critically important to the in situ conditions and variabilities of the water available on the surface and inside the heritage objects, so a more close and accurate measurements at the sampling location and the time of sampling is needed for improvement of cultural heritage research. In addition, the statistical results are inference from the available data, but not a confirmation on any relationship. Further experimental verification is required to advance the potential relation for establishment of the science, cause-and-effect. Because of these, proposal is made here to increase the awareness of these issues and practice so that future research can take them into account to improve the research experiments for better results in a positive way to enhance the knowledge on these subject matters to advance the science as the final goal.
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    • NSTL
    • Elsevier

    The effect of time and surface type on the composition of biofilm communities on concrete exposed to seawater

    Karacic S.Modin O.Persson F.Wilen B.-M....
    11页
    查看更多>>摘要：? 2022 The AuthorsMicrobially induced deterioration is a threat to concrete infrastructures in marine environments. Complex microbial biofilms form on concrete surfaces exposed to sea water and cause material deterioration. However, the mechanisms determining the composition and the development of the biofilm communities are poorly understood. We designed a mesocosm experiment to determine the influence of concrete surface structure (smooth/rough) and steel fiber reinforcement (presence/absence) on biofilm development over a period of 455 days. This enabled a novel methodology to systematically assess biofilm formation of bacteria on concrete exposed to marine water. The biofilm communities were distinctly different from the planktonic communities in the systems. The alpha diversity increased with time and longer time intervals correlated with higher turnover of taxa. Several taxa within Caulobacterales and Rhodobacterales were identified as early biofilm formers, which decreased in relative abundance and were replaced by taxa within Planctomycetales as the biofilm developed. Throughout the experimental period, concrete surface type influenced the microbial community composition. Some taxa such as Magnetospiraceae, Portibacter, Rubripirellula, and Rhodopirellula, possibly involved in the oxidation and reduction of iron, were for instance more abundant in biofilms on steel-fiber containing concrete. Null models suggested that mainly deterministic factors were shaping the microbial communities with limited importance of stochasticity at shorter time intervals.
      原文链接:
    • NSTL
    • Elsevier

    Crude oil degradation in oilfield produced water by immobilized microbes and oil recovery improvement after its reinjection

    Xue S.Zhang G.Xia S.Chen X....
    10页
    查看更多>>摘要：? 2022 Elsevier LtdOilfield produced water (OPW) with crude oil is a huge threat to the natural environment. For the treatment of OPW, degradation of crude oil in OPW by microorganisms and OPW activation by microbial metabolites for oil recovery improvement after reinjection may be an effective and sustainable approach. In this study, the degradation of crude oil in OPW by immobilized isolated bacteria was designed and the enhancement of oil recovery by reinjecting treated OPW was examined. Aldehyde fiber was found to show the optimum immobilization effect for three isolated oil-degrading-bacteria (Pseudomonas sp. ZJI-1, Acinetobacter sp. YMJ-1, and Gordonia sp. G1). The crude oil degradation rate of the immobilized bacteria reached 82.6% within 7 days. The contents of some bioactive molecules helpful for oil recovery, including rhamnolipid and acetic acid, increased continuously in the designed system. Core flooding tests demonstrated that oil recovery increased by 8.61% after the treated-OPW reinjection. In summary, the immobilized bacteria could effectively remove crude oil from OPW, increase the contents of rhamnolipid and acetic acid, and in particular, improve the oil production efficiency after reinjection.
      原文链接:
    • NSTL
    • Elsevier

    New protective coatings against lampenflora growing in the Pommery Champagne cellar

    Franco-Castillo I.Mitchell S.G.Misra A.Streb C....
    14页
    查看更多>>摘要：? 2022 The AuthorsPhototrophic microorganisms such as cyanobacteria and microalgae can proliferate readily in underground heritage sites where the introduction of artificial illumination equipment has significantly altered previously stable environmental conditions. The extended lampenflora biofilm growth on the bas-reliefs carved in the underground Pommery Champagne cellar in Reims (France) represents a recurring biocolonisation problem which requires periodic cleaning. The aim of this work was to limit the growth of lampenflora on chalk substrates using preventative biocidal treatments based on polyoxometalate ionic liquids (POM-ILs). Biocidal assays carried out in laboratory showed how two different colourless POM-IL coatings were more effective than commercial Preventol RI80 against two algal strains isolated from the Pommery bas reliefs, Pseudostichococcus monallantoides and Chromochloris zofingiensis. However, only one POM-IL variant was capable of sustained prevention of biofilm growth when applied to wet chalk, which replicates the more drastic natural environmental conditions of the cellar and can limit the performance of the biocidal coatings. Crucially, coating concentration studies demonstrate how POM-IL-coated slabs from previous experiments retain their biocidal activity and can prevent subsequent recolonisation following the re-inoculation of coated slabs with algae and cyanobacteria. Consequently, POM-ILs represent excellent candidates to eliminate lampenflora growth on the chalk bas-reliefs in the unique subterranean environment of the Pommery Champagne cellar.
      原文链接:
    • NSTL
    • Elsevier