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"Materials Biodegradation."
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L'écoconception des Infrastructures Maritimes
Cet ouvrage nous fait découvrir comment réaliser dans l'océan, ou sur le littoral, des aménagements intégrés à l'environnement, fonctionnellement efficaces et esthétiques.L'écoconception des infrastructures maritimes propose des réponses pragmatiques et réalistes pour la réalisation d'ouvrages qui réduisent les impacts des aménagements sur l'environnement. Il présente, au travers d'exemples concrets, un état de l'art précis et illustré qui permet à chacun de mieux comprendre l'écoconception marine et ses enjeux. Il offre au lecteur une méthodologie appliquée pour agir différemment, dans une perspective de transition écologique.Cet ouvrage s'adresse aux chercheurs, ingénieurs, étudiants et décideurs ou à toute personne curieuse de voir comment on peut aménager en s'inspirant de la nature.
eBook
Environmental degradation of advanced and traditional engineering materials
\"From metals and polymers to ceramics, natural materials, and composites, this book covers the environmental impacts on a broad range of materials used for the engineering of infrastructure, buildings, machines, and components all of which experience some form of degradation. The text discusses fundamental degradation processes and presents examples of degradation under various environmental conditions. It gives the fundamental principles for each class of material, followed by detailed characteristics of degradation for specific alloys of compositions, guidelines on how to protect against degradation, and a description of testing procedures\"-- Provided by publisher.
Book
Interactions Materials - Microorganisms
Metallic, cementitious, polymeric or composite materials age according to their service environment. Thus, when microorganisms are present, they can induce a biodeterioration. However, microorganisms can also contribute to the protection of the structures, provided to master and exploit their immense possibilities.
eBook
The Phylogeny and Metabolic Potentials of an Aromatics-Degrading Marivivens Bacterium Isolated from Intertidal Seawater in East China Sea
Lignocellulosic materials, made up of cellulose, hemicellulose, and lignin, constitute some of the most prevalent types of biopolymers in marine ecosystems. The degree to which marine microorganisms participate in the breakdown of lignin and their impact on the cycling of carbon in the oceans is not well understood. Strain LCG002, a novel Marivivens species isolated from Lu Chao Harbor’s intertidal seawater, is distinguished by its ability to metabolize lignin and various aromatic compounds, including benzoate, 3-hydroxybenzoate, 4-hydroxybenzoate and phenylacetate. It also demonstrates a broad range of carbon source utilization, including carbohydrates, amino acids and carboxylates. Furthermore, it can oxidize inorganic gases, such as hydrogen and carbon monoxide, providing alternative energy sources in diverse marine environments. Its diversity of nitrogen metabolism is supported by nitrate/nitrite, urea, ammonium, putrescine transporters, as well as assimilatory nitrate reductase. For sulfur assimilation, it employs various pathways to utilize organic and inorganic substrates, including the SOX system and DSMP utilization. Overall, LCG002’s metabolic versatility and genetic profile contribute to its ecological significance in marine environments, particularly in the degradation of lignocellulosic material and aromatic monomers.
Journal Article
The Impact of Bacteria of the Genus Bacillus upon the Biodamage/Biodegradation of Some Metals and Extensively Used Petroleum-Based Plastics
This paper tackles bacteria of the genus Bacillus as both biodamaging/biodegrading and biocontrolling agents. The article addresses the said bacteria’s ability to form biofilms and corrosive, antimicrobial and antibiofilm proactive compounds, primarily, siderophores. Their role depends on the species, microorganism strain, production of antimicrobial substances, biofilm formation, and the type of damaged material. The bacteria under analysis have demonstrated the ability to cause as well as inhibit biodamage. The involvement of bacteria of the genus Bacillus in microbiologically influenced corrosion processes is determined by the production of corrosive metabolites and the impact of certain bioelectrochemical mechanisms. Lipopeptides generated by Bacillus subtilis (surfactin, iturin and fengycin) are capable of modifying surfaces’ hydrophobic properties and impacting the microbes’ adhesion to surfaces. Produced by Bacillus velezensis, the siderophore bacillibactin at a high concentration is capable of inhibiting the formation of bacterial biofilms, thus slowing down the degradation of materials. Further study of siderophores as green inhibitors of microbiologically influenced corrosion may be promising as the said compounds possess antibiofilm-forming properties and high-intensity inhibitory capabilities.
Journal Article
The Fabrication of Cassava Silk Fibroin-Based Composite Film with Graphene Oxide and Chitosan Quaternary Ammonium Salt as a Biodegradable Membrane Material
A novel and excellent composite film was fabricated by simply casting cassava silk fibroin (CSF), chitosan quaternary ammonium salt (HACC), and graphene oxide (GO) in an aqueous solution. Scanning electron microscope images showed that when GO was dispersed in the composite films, the surface of CSF-based composite film became rough, and a wrinkled GO structure could be found. When the content of GO was 0.8%, the film displayed a higher change with respect to the breaking strength and elongation, respectively, up to 97.69 ± 3.69 and 79.11 ± 1.48 MPa, keeping good thermal properties because of the incorporation of GO and HACC. Furthermore, the novel CSF/HACC/GO composite film demonstrates a lower degradation rate, implying the improvement of the resistance to the enzyme solution. Especially in the film with 0.8 wt% GO, the residual mass arrived at 64.35 ± 1.1% of the primary mass after 21 days compared with the CSF/HACC film. This would reclaim the application of silk-based composite films in the biomaterial field.
Journal Article
DAMAGES CAUSED BY MICROORGANISMS IN HISTORICAL BUILDINGS ON THE EXAMPLE OF A MULTI-FAMILY RESIDENTIAL BUILDING
The article discusses the destruction of materials in a historic building caused by microorganisms. The problem is presented on the example of a historic multi-family building in the historic centre of the city of Lublin, Poland. The building is an object which, due to its material value, is under strict conservator's protection. As part of the assessment of the technical condition, among other things, tests were carried out to determine the level of dampness in the masonry walls, and also microbiological tests due to the visible degree of biological corrosion of the wall surfaces. The research was aimed at determining the degree of microbiological contamination of the object. Microbiological and chemical methods (gas chromatography) were used to characterise the material samples. The results indicate that the rooms of the studied building are biologically loaded.
Journal Article