Excretion of organic acids by fungal strains isolated from decayed sandstone

Gomez‐Alarcon, G.; Muñoz, Macarena; Flores, M.

doi:10.1016/0964-8305(94)90006-x

Cited by 55 publications

(21 citation statements)

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“…As no direct physical attacks by fungal hyphae or cyanobacterial filaments were observable via microscopical methods (SEM, TEM, light microscopy) within mineral samples, an indirect process resulting from microbial metabolism is suggested. For example, production of organic acids or respiration-derived CO 2 would lower the pH, which is a possible factor in biodeterioration of minerals (Delatorre et al, 1993;Gómez-Alarcón et al, 1994;Machill et al, 1997;Weber et al, 2011). The fact that pH decreased only slightly and in the same way in all experiments despite varying extent of dissolution (Figure 3) is not contradictory with this explanation as pH values in the direct micro-environment of cells between a biofilm and its substrate can differ significantly from those in the macro-environment (Bonneville et al, 2011).…”

Section: Discussionmentioning

confidence: 56%

“…Excreted organic acids and respiration-derived CO 2 are often active in these processes (Silverman and Munoz, 1970;Delatorre et al, 1993;Gómez-Alarcón et al, 1994;Machill et al, 1997;Landeweert et al, 2001;Abdulla, 2009;Weber et al, 2011), although fungal hyphae can directly penetrate and widen fissures in rocks (Sterflinger, 2000;Gorbushina et al, 2003;Chertov et al, 2004). The extreme microbial diversity of soil organisms (Jongmans et al, 1997;Landeweert et al, 2001;Schöll et al, 2008;Abdulla, 2009;Bonneville et al, 2009;Rosling et al, 2009;Taylor et al, 2009) and accompanying macroscopic vegetation results in high rates of weathering.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Tools to Quantify Biogenic Dissolution of Rocks and Minerals: A Model Rock Biofilm Growing in Percolation Columns

et al. 2016

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Sub-aerial biofilms (SAB) are ubiquitous, self-sufficient microbial ecosystems found on mineral surfaces at all altitudes and latitudes. SABs, which are the principal causes of weathering on exposed terrestrial surfaces, are characterized by patchy growth dominated by associations of algae, cyanobacteria, fungi and heterotrophic bacteria. A recently developed in vitro system to study colonization of rocks exposed to air included two key SAB participants -the rock-inhabiting ascomycete Knufia petricola (CBS 123872) and the phototrophic cyanobacterium Nostoc punctiforme ATCC29133. Both partners are genetically tractable and we used them here to study weathering of granite, K-feldspar and plagioclase. Small fragments of the various rocks or minerals (1-6 mm) were packed into flow-through columns and incubated with 0.1% glucose and 10 µM thiamine-hydrochloride (90 µL min −1 ) to compare weathering with and without biofilms. Dissolution of the minerals was followed by: (i) analysing the degradation products in the effluent from the columns via Inductively Coupled Plasma Spectroscopy and (ii) by studying polished sections of the incubated mineral fragments/grains using scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analyses. K. petricola/N. punctiforme stimulated release of Ca, Na, Mg and Mn. Analyses of the polished sections confirmed depletion of Ca, Na and K near the surface of the fragments. The abrupt decrease in Ca concentration observed in peripheral areas of plagioclase fragments favored a dissolution-reprecipitation mechanism. Percolation columns in combination with a model biofilm can thus be used to study weathering in closed systems. Columns can easily be filled with different minerals and biofilms, the effluent as well as grains can be collected after long-term exposure under axenic conditions and easily analyzed.

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Section: Discussionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Laboratory Tools to Quantify Biogenic Dissolution of Rocks and Minerals: A Model Rock Biofilm Growing in Percolation Columns

et al. 2016

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“…Under drier conditions, the biofilms are generally grey in colour, whereas more humid areas are more frequently green [2]. Cyanobacteria were found on several materials types: concrete and stones, metals, painted surfaces and plastic [5,26,31,[38][39][40][41]. Table 1 shows the main species isolated from disfigured buildings or those that have been shown to be capable of biodeterioration.…”

Section: Cyanobacteria and Algaementioning

confidence: 99%

“…Non-biological weathering processes are increasing in last decades, especially in urban areas, owing to the higher incidence of environmental and anthropogenic pollution [3,4]. These deleterious effects on buildings and monuments are well documented [5,6]. In addition to physical and chemical problems due to weathering and soiling, the biological growth accelerates the fouling process of outdoor materials, as shown in Figs 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

“…However, it was observed that chemically polluted buildings organic materials may act as nutrients for heterotrophic organisms. Under these conditions, heterotrophic bacteria could be the primary colonizers of buildings [5,62]. Adsorbed pollutants are composed by an ensemble of organic materials, including fatty acids and aliphatic and aromatic hydrocarbons, and these obviously accelerate both aesthetically and chemically modification of the nature of the surfaces [63].…”

Section: Fungimentioning

confidence: 99%

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Review on the influence of biological deterioration on the surface properties of building materials: organisms, materials, and methods

Ferrari¹,

Santunione²,

Libbra³

et al. 2015

Int. J. DNE

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A strong attention is recently paid to surface properties of building materials as these allows controlling solar gains of the building envelope and overheating of buildings and urban areas. In this regard, deterioration phenomena due to biological aggression can quickly damage solar-reflecting roof surfaces and thus increase sharply solar gains, discomfort, air-conditioning costs and waterproofing degradation. The same deterioration problem has deleterious effect on cultural heritage, ruining its huge historic and artistic value. This work is aimed at providing an overview on the different organisms that affect the surface of most used building materials, to support the design of new building materials with long-lasting surface properties and to find a way to preserve cultural heritage. Artificial ageing is the long-term aim of this investigation, in which what in nature happens after months or years is compressed in a very short time by forcing the growth of microorganisms through a strict control on the different conditioning factors. Both natural and artificial ageing are eventually outlined in the last part of this work to provide a comprehensive idea of what is necessary to study in a complete way biological ageing protocols on building materials. Several characterization techniques are also introduced to analyse the influence of microorganisms on the surface of different building materials.

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Biodeterioration of Mineral Materials

Gaylarde

Morton

2003

Encyclopedia of Environmental Microbiology

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Biofilms and Mineral Materials Deterioration Processes Nonbiological Weathering Processes Biological Weathering—Biodeterioration and Biodegradation Silicon and Silicates Limestone, Shale, and Sandstone Cement and Concrete

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Excretion of organic acids by fungal strains isolated from decayed sandstone

Cited by 55 publications

References 10 publications

Laboratory Tools to Quantify Biogenic Dissolution of Rocks and Minerals: A Model Rock Biofilm Growing in Percolation Columns

Laboratory Tools to Quantify Biogenic Dissolution of Rocks and Minerals: A Model Rock Biofilm Growing in Percolation Columns

Review on the influence of biological deterioration on the surface properties of building materials: organisms, materials, and methods

Biodeterioration of Mineral Materials

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