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Vrba R, Lavoie I, Creusot N, Eon M, Millan-Navarro D, Feurtet-Mazel A, Mazzella N, Moreira A, Planas D, Morin S. Experimental testing of two urban stressors on freshwater biofilms. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2024; 272:106972. [PMID: 38815346 DOI: 10.1016/j.aquatox.2024.106972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 05/17/2024] [Accepted: 05/22/2024] [Indexed: 06/01/2024]
Abstract
Aquatic ecosystems and their communities are exposed to numerous stressors of various natures (chemical and physical), whose impacts are often poorly documented. In urban areas, the use of biocides such as dodecyldimethylbenzylammonium chloride (DDBAC) and their subsequent release in wastewater result in their transfer to urban aquatic ecosystems. DDBAC is known to be toxic to most aquatic organisms. Artificial light at night (ALAN) is another stressor that is increasing globally, especially in urban areas. ALAN may have a negative impact on photosynthetic cycles of periphytic biofilms, which in turn may result in changes in their metabolic functioning. Moreover, studies suggest that exposure to artificial light could increase the biocidal effect of DDBAC on biofilms. The present study investigates the individual and combined effects of DDBAC and/or ALAN on the functioning and structure of photosynthetic biofilms. We exposed biofilms in artificial channels to a nominal concentration of 30 mg.L-1 of DDBAC and/or ALAN for 10 days. ALAN modified DDBAC exposure, decreasing concentrations in the water but not accumulation in biofilms. DDBAC had negative impacts on biofilm functioning and structure. Photosynthetic activity was inhibited by > 90% after 2 days of exposure, compared to the controls, and did not recover over the duration of the experiment. Biofilm composition was also impacted, with a marked decrease in green algae and the disappearance of microfauna under DDBAC exposure. The integrity of algal cells was compromised where DDBAC exposure altered the chloroplasts and chlorophyll content. Impacts on autotrophs were also observed through a shift in lipid profiles, in particular a strong decrease in glycolipid content was noted. We found no significant interactive effect of ALAN and DDBAC on the studied endpoints.
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Affiliation(s)
- Romain Vrba
- INRAE, UR EABX, 50 avenue de Verdun, 33612 Cestas cedex, France; INRS-ETE, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada
| | - Isabelle Lavoie
- INRS-ETE, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada
| | - Nicolas Creusot
- INRAE, UR EABX, 50 avenue de Verdun, 33612 Cestas cedex, France
| | - Mélissa Eon
- INRAE, UR EABX, 50 avenue de Verdun, 33612 Cestas cedex, France
| | | | | | | | - Aurélie Moreira
- INRAE, UR EABX, 50 avenue de Verdun, 33612 Cestas cedex, France
| | - Dolors Planas
- UQAM, GRIL-Département des sciences biologiques, 141 Avenue du Président-Kennedy, Montréal, QC H2 × 1Y4, Canada
| | - Soizic Morin
- INRAE, UR EABX, 50 avenue de Verdun, 33612 Cestas cedex, France.
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2
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Idris AL, Li W, Huang F, Lin F, Guan X, Huang T. Impacts of UV radiation on Bacillus biocontrol agents and their resistance mechanisms. World J Microbiol Biotechnol 2024; 40:58. [PMID: 38165488 DOI: 10.1007/s11274-023-03856-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 11/24/2023] [Indexed: 01/03/2024]
Abstract
Bacillus biocontrol agent(s) BCA(s) such as Bacillus cereus, Bacillus thuringiensis and Bacillus subtilis have been widely applied to control insects' pests of plants and pathogenic microbes, improve plant growth, and facilitate their resistance to environmental stresses. In the last decade, researchers have shown that, the application of Bacillus biocontrol agent(s) BCA(s) optimized agricultural production yield, and reduced disease risks in some crops. However, these bacteria encountered various abiotic stresses, among which ultraviolet (UV) radiation severely decrease their efficiency. Researchers have identified several strategies by which Bacillus biocontrol agents resist the negative effects of UV radiation, including transcriptional response, UV mutagenesis, biochemical and artificial means (addition of protective agents). These strategies are governed by distinct pathways, triggered by UV radiation. Herein, the impact of UV radiation on Bacillus biocontrol agent(s) BCA(s) and their mechanisms of resistance were discussed.
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Affiliation(s)
- Aisha Lawan Idris
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Wenting Li
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Fugui Huang
- Fujian Polytechnic of Information Technology, Fuzhou, 350003, China
| | - Fuyong Lin
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Xiong Guan
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Tianpei Huang
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
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3
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Villar-dePablo M, Ascaso C, Rodríguez-Pérez E, Urizal M, Wierzchos J, Pérez-Ortega S, de Los Ríos A. Innovative approaches to accurately assess the effectiveness of biocide-based treatments to fight biodeterioration of Cultural Heritage monuments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 897:165318. [PMID: 37422225 DOI: 10.1016/j.scitotenv.2023.165318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 07/01/2023] [Accepted: 07/02/2023] [Indexed: 07/10/2023]
Abstract
The development of diagnostic methods to accurately assess the effects of treatments on lithobiont colonization remains a challenge for the conservation of Cultural Heritage monuments. In this study, we tested the efficacy of biocide-based treatments on microbial colonization of a dolostone quarry, in the short and long-term, using a dual analytical strategy. We applied a metabarcoding approach to characterize fungal and bacterial communities over time, integrated with microscopy techniques to analyze the interactions of microorganisms with the substrate and evaluate the effectiveness. These communities were dominated by the bacterial phyla Actinobacteriota, Proteobacteria and Cyanobacteria, and the fungal order Verrucariales, which include taxa previously reported as biodeteriogenic agents and observed here associated with biodeterioration processes. Following the treatments, changes over time in the abundance profiles depend on taxa. While Cyanobacteriales, Cytophagales and Verrucariales decreased in abundance, other groups, such as Solirubrobacteriales, Thermomicrobiales and Pleosporales increased. These patterns could be related not only to the specific effects of the biocide on the different taxa, but also to different recolonization abilities of those organisms. The different susceptibility to treatments could be associated with the inherent cellular properties of different taxa, but differences in biocide penetration to endolithic microhabitats could be involved. Our results demonstrate the importance of both removing epilithic colonization and applying biocides to act against endolithic forms. Recolonization processes could also explain some of the taxon-dependent responses, especially in the long-term. Taxa showing resistance, and those benefiting from nutrient accumulation in the form of cellular debris following treatments, may have an advantage in colonizing treated areas, pointing to the need for long-term monitoring of a wide range of taxa. This study highlights the potential utility of combining metabarcoding and microscopy to analyze the effects of treatments and design appropriate strategies to combat biodeterioration and establish preventive conservation protocols.
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Affiliation(s)
- Mar Villar-dePablo
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo., E-28006 Madrid, Spain
| | - Carmen Ascaso
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo., E-28006 Madrid, Spain
| | - Esther Rodríguez-Pérez
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo., E-28006 Madrid, Spain
| | | | - Jacek Wierzchos
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo., E-28006 Madrid, Spain
| | - Sergio Pérez-Ortega
- Department of Mycology, Real Jardín Botánico (CSIC), Plaza Murillo 2, E-28014 Madrid, Spain
| | - Asunción de Los Ríos
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo., E-28006 Madrid, Spain.
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Addesso R, Baldantoni D, Cubero B, De La Rosa JM, González Pérez JA, Tiago I, Caldeira AT, De Waele J, Miller AZ. A multidisciplinary approach to the comparison of three contrasting treatments on both lampenflora community and underlying rock surface. BIOFOULING 2023; 39:204-217. [PMID: 37092276 DOI: 10.1080/08927014.2023.2202314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Removing lampenflora, phototrophic organisms developing on rock surfaces in tourist cavities due to the artificial lighting, is a challenge for sustainable and appropriate long-term management of caves. Photosynthetic-based biofilms usually cause rock biodeterioration and an ecological imbalance in cave ecosystems. In this work, a detailed investigation of the effects of the 3 most commonly used lampenflora cleaning operations (NaClO, H2O2 and UVC) was carried out in Pertosa-Auletta Cave (Italy). The application of NaClO showed good disinfection capability over extended periods of time without causing any appreciable rock deterioration. The H2O2 treatment showed to be corrosive for the rock surfaces covered with vermiculation deposits. The chemical alteration of organic and inorganic compounds by H2O2 did not remove biomass, favoring biofilm recovery after three months of treatment. Both NaClO and H2O2 treatments were effective at removing photoautotrophs, although the bacterial phyla Proteobacteria and Bacteroidetes as well as Apicomplexa and Cercozoa among the Eukaryotes, were found to be resistant to these treatments. The UVC treatments did not show any noticeable effect on the biofilms.
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Affiliation(s)
- Rosangela Addesso
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Fisciano, SA, Italy
| | - Daniela Baldantoni
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Fisciano, SA, Italy
| | - Beatriz Cubero
- Instituto de Recursos Naturales y Agrobiología de Sevilla, IRNAS-CSIC, Sevilla, Spain
| | - José Maria De La Rosa
- Instituto de Recursos Naturales y Agrobiología de Sevilla, IRNAS-CSIC, Sevilla, Spain
| | | | - Igor Tiago
- Department of Life Sciences, Centre for Functional Ecology, University of Coimbra, Calçada Martim de Freitas, Coimbra, Portugal
| | | | - Jo De Waele
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Ana Z Miller
- Instituto de Recursos Naturales y Agrobiología de Sevilla, IRNAS-CSIC, Sevilla, Spain
- HERCULES Laboratory, University of Évora, Évora, Portugal
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Review of Method and a New Tool for Decline and Inactive SARS-CoV-2 in Wastewater Treatment. CLEANER CHEMICAL ENGINEERING 2022. [PMCID: PMC9213033 DOI: 10.1016/j.clce.2022.100037] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Following the recent outbreak of the COVID-19 pandemic caused by the SARS-CoV-2 virus, monitoring sewage has become crucial, according to reports that the virus was detected in sewage. Currently, various methods are discussed for understanding the SARS-CoV-2 using wastewater surveillance. This paper first introduces the fundamental knowledge of primary, secondary, and tertiary water treatment on SARS-CoV-2. Next, a thorough overview is presented to summarize the recent developments and breakthroughs in removing SARS-CoV-2 using solar water disinfection (SODIS) and UV (UVA (315–400 nm), UVB (280-315 nm), and UVC (100–280 nm)) process. In addition, Due to the fact that the distilled water can be exposed to sunlight if there is no heating source, it can be disinfected using solar water disinfection (SODIS). SODIS, on the other hand, is a well-known method of reducing pathogens in contaminated water; moreover, UVC can inactivate SARS-CoV-2 when the wavelength is between 100 to 280 nanometers. High temperatures (more than 56°C) and UVC are essential for eliminating SARS-CoV-2; however, the SODIS systems use UVA and work at lower temperatures (less than45°C). Therefore, using SODIS methods for wastewater treatment (or providing drinking water) is not appropriate during a situation like the ongoing pandemic. Finally, a wastewater-based epidemiology (WBE) tracking tool for SARS-CoV-2 can be used to detect its presence in wastewater.
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Review of concerned SARS-CoV-2 variants like Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Delta (B.1.617.2), and Omicron (B.1.1.529), as well as novel methods for reducing and inactivating SARS-CoV-2 mutants in wastewater treatment facilities. JOURNAL OF HAZARDOUS MATERIALS ADVANCES 2022. [PMID: 37520798 PMCID: PMC9349052 DOI: 10.1016/j.hazadv.2022.100140] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The coronavirus known as COVID-19, which causes pandemics, is causing a global epidemic at a critical stage today. Furthermore, novel mutations in the SARS-CoV-2 spike protein have been discovered in an entirely new strain, impacting the clinical and epidemiological features of COVID-19. Variants of these viruses can increase the transmission in wastewater, lead to reinfection, and reduce immunity provided by monoclonal antibodies and vaccinations. According to the research, a large quantity of viral RNA was discovered in wastewater, suggesting that wastewater can be a crucial source of epidemiological data and health hazards. The purpose of this paper is to introduce a few basic concepts regarding wastewater surveillance as a starting point for comprehending COVID-19′s epidemiological aspects. Next, the observation of Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Delta (B.1.617.2), and Omicron (B.1.1.529) in wastewater is discussed in detail. Secondly, the essential information for the initial, primary, and final treating sewage in SARS-CoV-2 is introduced. Following that, a thorough examination is provided to highlight the newly developed methods for eradicating SARS-CoV-2 using a combination of solar water disinfection (SODIS) and ultraviolet radiation A (UVA (315-400 nm)), ultraviolet radiation B (UVB (280-315 nm)), and ultraviolet radiation C (UVC (100-280 nm)) processes. SARS-CoV-2 eradication requires high temperatures (above 56°C) and UVC. However, SODIS technologies are based on UVA and operate at cooler temperatures (less than 45°C). Hence, it is not appropriate for sewage treatment (or water consumption) to be conducted using SODIS methods in the current pandemic. Finally, SARS-CoV-2 may be discovered in sewage utilizing the wastewater-based epidemiology (WBE) monitoring method.
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7
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A Review on Building Design as a Biomedical System for Preventing COVID-19 Pandemic. BUILDINGS 2022. [DOI: 10.3390/buildings12050582] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Sustainable design methods aim to obtain architectural solutions that assure the coexistence and welfare of human beings, inorganic structures, and living things that constitute ecosystems. The novel coronavirus emergence, inadequate vaccines against the present severe acute respiratory syndrome-coronavirus-(SARS-CoV-2), and increases in microbial resistance have made it essential to review the preventative approaches used during pre-antibiotic periods. Apart from low carbon emissions and energy, sustainable architecture for facilities, building designs, and digital modeling should incorporate design approaches to confront the impacts of communicable infections. This review aims to determine how architectural design can protect people and employees from harm; it models viewpoints to highlight the architects’ roles in combating coronavirus disease 2019 (COVID-19) and designing guidelines as a biomedical system for policymakers. The goals include exploring the hospital architecture evolution and the connection between architectural space and communicable infections and recommending design and digital modeling strategies to improve infection prevention and controls. Based on a wide-ranging literature review, it was found that design methods have often played important roles in the prevention and control of infectious diseases and could be a solution for combating the wide spread of the novel coronavirus or coronavirus variants or delta.
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8
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Parsa SM, Momeni S, Hemmat A, Afrand M. Effectiveness of solar water disinfection in the era of COVID-19 (SARS-CoV-2) pandemic for contaminated water/wastewater treatment considering UV effect and temperature. JOURNAL OF WATER PROCESS ENGINEERING 2021; 43:102224. [PMID: 35592836 PMCID: PMC8285244 DOI: 10.1016/j.jwpe.2021.102224] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 05/26/2021] [Accepted: 07/15/2021] [Indexed: 05/09/2023]
Abstract
Long is the way and hard, that out of COVID-19 leads up to light. The virus is highly contagious and spread rapidly and the number of infections increases exponentially. The colossal number of infections and presence of the novel coronavirus RNA in human wastes (e.g. Excreta/urine) even after the patients recovered and the RT-PCR tests were negative, results in massive load of the viral in water environments. Numerous studies reported the presence of SARS-CoV-2 in wastewater samples. The risk of contaminating water bodies in the regions which suffer from the lack of proper sanitation system and wastewater treatment plants (mostly in developing countries) is higher. Since solar water disinfection (SODIS) is usually used by people in developing countries, there is a concern about using this method during the pandemic. Because the SARS-CoV-2 can be eliminated by high temperature (>56 °C) and UVC wavelength (100-280 nm) while SODIS systems mainly work at lower temperature (<45 °C) and use the available UVA (315-400 nm). Thus, during a situation like the ongoing pandemic using SODIS method for wastewater treatment (or providing drinking water) is not a reliable method. It should be reminded that the main aim of the present study is not just to give insights about the possibilities and risks of using SODIS during the ongoing pandemic but it has broader prospect for any future outbreak/pandemic that results in biological contamination of water bodies. Nevertheless, some experimental studies seem to be necessary by all researchers under conditions similar to developing countries.
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Affiliation(s)
- Seyed Masoud Parsa
- Department of Energy Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Saba Momeni
- Guilan University of Medical Science, Anzali International Campus, Bandar Anzali, Iran
| | - Ahmadreza Hemmat
- Department of Medicine, Najafabad Branch, Islamic Azad University, Najafabad, Iran
| | - Masoud Afrand
- Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
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9
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Metelmann S, Pattni K, Brierley L, Cavalerie L, Caminade C, Blagrove MSC, Turner J, Sharkey KJ, Baylis M. Impact of climatic, demographic and disease control factors on the transmission dynamics of COVID-19 in large cities worldwide. One Health 2021. [PMID: 33558848 DOI: 10.1101/2020.07.17.20155226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023] Open
Abstract
Approximately a year into the COVID-19 pandemic caused by the SARS-CoV-2 virus, many countries have seen additional "waves" of infections, especially in the temperate northern hemisphere. Other vulnerable regions, such as South Africa and several parts of South America have also seen cases rise, further impacting local economies and livelihoods. Despite substantial research efforts to date, it remains unresolved as to whether COVID-19 transmission has the same sensitivity to climate observed for other common respiratory viruses such as seasonal influenza. Here, we look for empirical evidence of seasonality using a robust estimation framework. For 359 large cities across the world, we estimated the basic reproduction number (R0) using logistic growth curves fitted to cumulative case data. We then assess evidence for association with climatic variables through ordinary least squares (OLS) regression. We find evidence of seasonality, with lower R0 within cities experiencing greater surface radiation (coefficient = -0.005, p < 0.001), after adjusting for city-level variation in demographic and disease control factors. Additionally, we find association between R0 and temperature during the early phase of the epidemic in China. However, climatic variables had much weaker explanatory power compared to socioeconomic and disease control factors. Rates of transmission and health burden of the continuing pandemic will be ultimately determined by population factors and disease control policies.
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Affiliation(s)
- Soeren Metelmann
- Department of Evolution, Ecology and Behaviour, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
- Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, UK
| | - Karan Pattni
- Department of Mathematical Sciences, University of Liverpool, Peach Street, Liverpool L69 7ZL, UK
| | - Liam Brierley
- Department of Health Data Science, Institute of Population Health, University of Liverpool, Brownlow Street, Liverpool, L69 3GL, UK
| | - Lisa Cavalerie
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
- International Livestock Research Institute, Addis Ababa, Ethiopia
| | - Cyril Caminade
- Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, UK
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
| | - Marcus S C Blagrove
- Department of Evolution, Ecology and Behaviour, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
| | - Joanne Turner
- Department of Mathematical Sciences, University of Liverpool, Peach Street, Liverpool L69 7ZL, UK
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
| | - Kieran J Sharkey
- Department of Mathematical Sciences, University of Liverpool, Peach Street, Liverpool L69 7ZL, UK
| | - Matthew Baylis
- Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, UK
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Brownlow Hill, Liverpool L3 5RF, UK
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Sanmartín P, Noya-Pintos D, Fuentes E, Pozo-Antonio JS. Cracks in consolidants containing TiO 2 as a habitat for biological colonization: A case of quaternary bioreceptivity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 124:112058. [PMID: 33947552 DOI: 10.1016/j.msec.2021.112058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/15/2021] [Accepted: 03/20/2021] [Indexed: 10/21/2022]
Abstract
The recently proposed concept of quaternary bioreceptivity applies to substrates treated with coating materials and it is considered in the present study with the alga Bracteacoccus minor and the cyanobacterium Nostoc sp. onto granite specimens treated with ethyl silicate and nano-sized silica doped with different amounts of TiO2 (0, 0.5, 1 and 3 wt%). The findings showed a lack of correlation between the amount of TiO2 and the level of colonization (main bioreceptivity estimator) to the presence of cracks on the surface, which annul the biocidal power of TiO2. Crack formation, which depends on the mechanical properties, greatly influences the bioreceptivity of the material. Thus, the cracks provided anchor points where water is retained, in turn strongly influencing the early stages of colonization kinetics, to a greater extent than the biocidal power of TiO2, which will probably increase as the biofilm develops over the entire surface. In addition, although the cracks were more abundant and wider in the ethyl silicate-based consolidant, the nano-sized silica provided better anchoring points, making the material treated with the corresponding consolidant more bioreceptive.
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Affiliation(s)
- P Sanmartín
- Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - D Noya-Pintos
- Escola Superior de Conservación e Restauración de Bens Culturais de Galicia, 36002 Pontevedra, Spain
| | - E Fuentes
- Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - J S Pozo-Antonio
- CINTECX, GESSMin Group, Departamento de Enxeñaría dos Recursos Naturais e Medio Ambiente, Escola de Enxeñaría de Minas e Enerxía, University of Vigo, Vigo 36310, Spain
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11
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Emmanuel U, Osondu ED, Kalu KC. Architectural design strategies for infection prevention and control (IPC) in health-care facilities: towards curbing the spread of Covid-19. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:1699-1707. [PMID: 33145025 PMCID: PMC7596836 DOI: 10.1007/s40201-020-00580-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 10/24/2020] [Indexed: 05/06/2023]
Abstract
Background Sustainable design strategies are targeted at finding architectural solutions that reassure the well-being and coexistence of inorganic features, living organisms, and humans that make up the ecosystem. The emergence of the novel coronavirus, an increase in microbial resistance, and lack of a vaccine for the present pandemic have made it imperative to appraise the preventive strategies employed during the pre-antibiotic period. Sustainable architecture for children's hospital design and childcare facilities, apart from low energy and carbon emission, must integrate design strategies to confront the impact of infectious diseases. Aim The aim of the paper is to identify how the space patients and health-care workers0 occupy can be made safer from an architectural design perspective with the view of developing guidelines for policymakers and highlighting the architect's role in combating the pandemic. Objectives The objectives include; to examine the evolution of medical architecture and the nexus between infectious diseases and architectural space and suggest a design approach that enhances infection prevention and control (IPC). Method The paper relied on existing literature, interviews, and interactions with healthcare workers. Results/Conclusion The findings showed that design strategies have always played a significant role in infection prevention and control (IPC) and could as well be a panacea for curbing the spread of Covid -19.
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Affiliation(s)
- Udomiaye Emmanuel
- Department of Architectural Technology, Akanu Ibiam Federal Polytechnic, Uwana, Nigeria
| | - Eze Desy Osondu
- Department of Architectural Technology, Akanu Ibiam Federal Polytechnic, Uwana, Nigeria
| | - Kalu Cheche Kalu
- Department of Architectural Technology, Akanu Ibiam Federal Polytechnic, Uwana, Nigeria
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12
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Pozo-Antonio JS, Noya-Pintos D, Sanmartín P. Moving toward Smart Cities: Evaluation of the Self-Cleaning Properties of Si-Based Consolidants Containing Nanocrystalline TiO 2 Activated by either UV-A or UV-B Radiation. Polymers (Basel) 2020; 12:polym12112577. [PMID: 33147858 PMCID: PMC7692194 DOI: 10.3390/polym12112577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 10/27/2020] [Accepted: 10/31/2020] [Indexed: 11/16/2022] Open
Abstract
This study evaluated the self-cleaning ability and durability of Si-based consolidants (an ethyl silicate consolidant and a consolidant based on nanosized silica) spiked with nanocrystalline TiO2 activated by either UV-A radiation (spectral region between 340 and 400 nm, and main peak at 365 nm) or UV-B radiation (spectral region between 270 and 420 nm, and main peak at 310 nm). Granite samples were coated with consolidant, to which nanocrystalline TiO2 was added at different concentrations (0.5, 1, and 3%, by wt.). Diesel soot was then applied to the coated surfaces, and the samples were exposed to UV-A or UV-B radiation for 1650 h. The surface color changes, relative to the color of untreated granite, were determined every 330 h by color spectrophotometry. Slight color changes indicated a recovery of the reference color due to the degradation of the soot. The final surfaces of both the untreated and treated surfaces were compared by stereomicroscopy and scanning electron microscopy. The main findings were that: (1) In general, the consolidant containing nanosized silica induced the most intense photocatalytic activity. In the more compact xerogel coating formed by the nanosized silica, more TiO2 nanoparticles were available to interact with the radiation. (2) For all consolidant mixtures, soot degradation remained constant or decreased over time, except with ethyl silicate with 0.5 wt % TiO2 (no self-cleaning capacity). (3) Soot degradation increased with the concentration of TiO2. (4) The UV-B radiation was the most effective in terms of soot degradation, except for the surface coated with the ethyl silicate and 3% wt. TiO2.
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Affiliation(s)
- José Santiago Pozo-Antonio
- Dpto. Enxeñaría dos Recursos Naturais e Medio Ambiente, Escola de Enxeñaría de Minas e Enerxía, Campus As Lagoas-Marcosende, University of Vigo, 36310 Vigo, Spain
- CINTECX, University of Vigo, 36310 Vigo, Spain
- Correspondence:
| | - Daniel Noya-Pintos
- Escola Superior de Conservación e Restauración de Bens Culturais de Galicia, 36002 Pontevedra, Spain;
| | - Patricia Sanmartín
- Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;
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The Control of Cultural Heritage Microbial Deterioration. Microorganisms 2020; 8:microorganisms8101542. [PMID: 33036341 PMCID: PMC7600914 DOI: 10.3390/microorganisms8101542] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/02/2020] [Accepted: 10/04/2020] [Indexed: 11/24/2022] Open
Abstract
The microbial deterioration of cultural heritage includes physical and chemical damage as well as aesthetic alteration. With the technological advancement, a plethora of techniques for removing unwanted microorganisms have opened up new opportunities for microbiologists and conservators. This article reviews the most applied, up-to-date, and sustainable techniques developed for the control of cultural heritage microbial deterioration presenting noteworthy case studies. These techniques include chemical methods, i.e., traditional biocides and nanoparticles; physical methods, such as mechanical removal, UV irradiation, gamma radiation, laser cleaning, heat shocking, microwaves, and dry ice treatment; and biological methods, such as natural molecules with biocidal activity, enzymes, and microorganisms. The application of control systems requires the comprehension of their behavior toward the unwanted microorganisms and possible interactions with the heritage materials. This overview shows also the control methods drawbacks for the purpose of creating awareness in selecting the most suitable technique or combination of techniques.
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14
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Affiliation(s)
- Ayse Seyer
- Department of Medical and Clinical Microbiology, Cyprus International University, Nicosia, 99258, Cyprus
| | - Tamer Sanlidag
- Department of Medical Microbiology, Celal Bayar University, Manisa, Turkey.,Experimental Health Sciences Research Institute, Near East University, Nicosia, Cyprus
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