217 results on '"Sterflinger Katja"'
Search Results
202. Beyond Artists' Colors: A Spectral Reference Database for the Identification of β-Naphthol and Triarylcarbonium Colorants by MeV SIMS.
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Raicu T, Krmpotić M, Siketić Z, Radović IB, Sterflinger K, and Jembrih-Simbürger D
- Abstract
β-Naphthol and triarylcarbonium colorants were often used by modern and contemporary artists in materials such as inks and paints. Their poor stability and ability to fade upon exposure to light make their identification in artworks crucial for planning exhibitions and preventive conservation. Secondary ion mass spectrometry with MeV primary ions (MeV SIMS) is necessary when analyzing synthetic organic colorants (SOCs) with similar molecular structures due to its advantages in high sensitivity and soft ionization, which causes a low fragmentation of organic molecules. In this work, we applied MeV SIMS with 5 MeV Si
4+ to identify selected β-naphthol and triarylcarbonium colorants from the 19th/20th century Materials Collection kept at the Academy of Fine Arts Vienna. The collection contains SOCs from renowned companies, such as I.G. Farben and I.C.I., and serves as a unique source of reference materials in the analysis of artworks. Previous research on these colorants with X-ray fluorescence analysis (XRF), micro-Raman, and Fourier transform infrared (FTIR) spectroscopies failed in the case of colorant mixtures. Similar spectral features of the SOCs within one chemical class and their low concentrations in mixtures did not lead to their identification using these techniques. MeV SIMS detected molecular ions or protonated molecules in the positive-ion mode. In the negative-ion mode, the functional groups (NO2 - and SO3 - ) of β-naphthol lakes/pigments and heteropolyacid species (WO3 - and MoO3 - ) characteristic of triarylcarbonium toners were determined. The results demonstrate that MeV SIMS is highly effective for identifying β-naphthol and triarylcarbonium colorants in mixtures and distinguishing between pigments, toners, lakes, and dyes., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)- Published
- 2024
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203. Fungal Biodeterioration Risk in Monastic Libraries without Climate Control.
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Derksen K, Brimblecombe P, Piñar G, Waldherr M, Graf A, Haltrich M, Querner P, and Sterflinger K
- Abstract
Fungi have always posed an unquestionable threat to heritage collections worldwide. Now, in a future of climate change, biological risk factors may have to be considered even more than before. Models and simulations to assess possible impacts a changing outdoor climate will have on indoor environments and, in turn, on biodeterioration are still underdeveloped and require a more substantial data basis. This study aimed at filling some of these knowledge gaps through a broad-based approach combining microclimatic and microbiological monitoring in four historic libraries in Austria with an uncontrolled indoor climate: Altenburg Abbey, Melk Abbey, Klosterneuburg Monastery and the Capuchin Monastery in Vienna. Data were generated from thermohygrometric sensors, cultivation-dependent air- and surface sampling and further surface dust sampling for cultivation-independent analyses. Results gave insights on the status quo of microbiological loads in the libraries and outdoor-indoor relationships. Influences of the geographic location and room-use on corresponding indoor fungal profiles were identified. Lower fungal diversities were found at the most rural site with the strongest climatic fluctuations and extreme values than in the most urban, sheltered library with a very stable climate. Further, the humidity-stabilizing potential of large collections of hygroscopic materials, such as books, was also examined. Implications for a sustainable approach to prevent future biodeterioration are discussed, supporting the long-term preservation of these valuable historic collections.
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- 2024
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204. Diversity of fungi associated with petroglyph sites in the Negev Desert, Israel, and their potential role in bioweathering.
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Rabbachin L, Nir I, Waldherr M, Vassallo Y, Piñar G, Graf A, Kushmaro A, and Sterflinger K
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The petroglyphs of the Negev Desert, Israel, are famous and valuable archaeological remains. Previous studies have investigated the microbial communities associated with petroglyphs and their potential role in stone deterioration; nevertheless, the role of fungi remains unclear. In this study, the fungal communities present on the stone and, as a comparison, in the surrounding environment (soil and air) at Negev petroglyph sites were analyzed by means of culture-dependent and -independent (metagenomic) techniques. The metagenomic results showed a high fungal biodiversity in the soil, and both approaches highlighted the prevalence of species producing melanized, large, thick-walled spores (mainly Alternaria spp.). From the air sampling, mostly Cladosporium spp. were retrieved. On the other hand, on the rock, the results seem to indicate a low presence of fungi, but with a rock-specialized mycobiota consisting of extremotolerant microcolonial fungi (MCF) (e.g., Vermiconidia and Coniosporium ) and lichens ( Flavoplaca ). In addition, low proportions of cosmopolitan fungi were detected on the stone, but the comparison of the data clearly indicates that they are transients from the surrounding environment. The ability of the isolated strains to dissolve CaCO
3 and therefore be a potential threat to the petroglyphs (limestone substrate) was tested, but only one strain resulted in positive acid production under laboratory conditions. Nevertheless, both lichens and MCF detected in this study are well-known stone deteriogens, which may have a significant impact on the petroglyph's deterioration., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Rabbachin, Nir, Waldherr, Vassallo, Piñar, Graf, Kushmaro and Sterflinger.)- Published
- 2024
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205. Optimizing cultivation conditions for the highest expression of fungal allergens.
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Pfeiffer S, Focke-Tejkl M, Sterflinger K, and Swoboda I
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- Humans, Antigens, Fungal, Alternaria, Aspergillus fumigatus, Plant Extracts, Fungal Proteins, Allergens, Hypersensitivity
- Abstract
Background: Any reliable allergy diagnosis depends on the quality of the testing material. In the case of fungal allergy, fungal extracts, typically used as test solutions, exhibit considerable differences in their allergenicity. Better knowledge of fungal allergen expression would enable the production of diagnostic fungal extracts of higher quality and, thus, improve the specificity and sensitivity of fungal allergy diagnosis., Objective: Our study aimed to find optimal cultivation conditions for the highest expression of fungal allergens., Methods: Fungal species (Alternaria alternata, Ulocladium chartarum, Aspergillus fumigatus, Cladosporium herbarum, and Paecilomyces variotii) were cultivated under different conditions, and extracts were prepared from fungal material. To detect the expression of the homologous major allergens Alt a 1 and Ulo c 1 and of different fungal enolases, Western blots with allergen-specific antibodies were carried out., Results: Western blots performed with antibodies directed against Alt a 1 and enolases showed that the expression of fungal allergens is highly species-dependent. Even allergens of closely related fungal species and highly conserved, cross-reactive allergens display different expression patterns., Conclusion: This study exhibits the impact of different environmental conditions on the expression of the fungal allergens Alt a 1, Ulo c 1, and different fungal enolases. Furthermore, it broadens the knowledge regarding the expression pattern of the major fungal allergens Alt a 1 and Ulo c 1. Information obtained in this study will help to optimize fungal cultivation to produce diagnostic fungal extracts of high quality and, therefore, improve diagnostic specificity and sensitivity., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2023
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206. Data Fusion Approach to Simultaneously Evaluate the Degradation Process Caused by Ozone and Humidity on Modern Paint Materials.
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Pagnin L, Calvini R, Sterflinger K, and Izzo FC
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The knowledge of the atmospheric degradation reactions affecting the stability of modern materials is still of current interest. In fact, environmental parameters, such as relative humidity (RH), temperature, and pollutant agents, often fluctuate due to natural or anthropogenic climatic changes. This study focuses on evaluating analytical and statistical strategies to investigate the degradation processes of acrylic and styrene-acrylic paints after exposure to ozone (O
3 ) and RH. A first comparison of FTIR and Py-GC/MS results allowed to obtain qualitative information on the degradation products and the influence of the pigments on the paints' stability. The combination of these results represents a significant potential for the use of data fusion methods. Specifically, the datasets obtained by FTIR and Py-GC/MS were combined using a low-level data fusion approach and subsequently processed by principal component analysis (PCA). It allowed to evaluate the different chemical impact of the variables for the characterization of unaged and aged samples, understanding which paint is more prone to ozone degradation, and which aging variables most compromise their stability. The advantage of this method consists in simultaneously evaluating all the FTIR and Py-GC/MS variables and describing common degradation patterns. From these combined results, specific information was obtained for further suitable conservation practices for modern and contemporary painted films.- Published
- 2022
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207. Natural sciences at the service of art and cultural heritage: an interdisciplinary area in development and important challenges.
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Piñar G and Sterflinger K
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- Natural Science Disciplines
- Abstract
Our cultural heritage is a common asset that tells the story of our shared past, is part of our origin and identity and has wide social relevance. Our works of art and our heritage must be enjoyed, appreciated and preserved for future generations. To this end, a wide and varied group of professionals, including conservators, restorers, curators, bibliographers, historians, archivists, but also scientists, such as biologists, chemists, physicists and bioinformaticians, work side by side to preserve our cultural heritage. Working together in this wide range of disciplines included in the so-called 'heritage sciences' is the only plausible way to contribute to the sustainable preservation of our heritage. The great progress made in recent years in conservation and restoration work, but also in the natural sciences considered within heritage science, has provided powerful tools and strategies for analytical and experimental research into historical and cultural objects that open up new frontiers for their diagnosis, monitoring and protection. Here we highlight some of the advances and challenges faced by the natural sciences at the service of art., (© 2021 The Authors. Microbial Biotechnology published by Society for Applied Microbiology and John Wiley & Sons Ltd.)
- Published
- 2021
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208. Effects of Simulated Microgravity on the Proteome and Secretome of the Polyextremotolerant Black Fungus Knufia chersonesos .
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Tesei D, Chiang AJ, Kalkum M, Stajich JE, Mohan GBM, Sterflinger K, and Venkateswaran K
- Abstract
Black fungi are a group of melanotic microfungi characterized by remarkable polyextremotolerance. Due to a broad ecological plasticity and adaptations at the cellular level, it is predicted that they may survive in a variety of extreme environments, including harsh niches on Earth and Mars, and in outer space. However, the molecular mechanisms aiding survival, especially in space, are yet to be fully elucidated. Based on these premises, the rock-inhabiting black fungus Knufia chersonesos (Wt) and its non-melanized mutant (Mut) were exposed to simulated microgravity-one of the prevalent features characterizing space conditions-by growing the cultures in high-aspect-ratio vessels (HARVs). Qualitative and quantitative proteomic analyses were performed on the mycelia and supernatant of culture medium (secretome) to assess alterations in cell physiology in response to low-shear simulated microgravity (LSSMG) and to ultimately evaluate the role of cell-wall melanization in stress survival. Differential expression was observed for proteins involved in carbohydrate and lipid metabolic processes, transport, and ribosome biogenesis and translation via ribosomal translational machinery. However, no evidence of significant activation of stress components or starvation response was detected, except for the scytalone dehydratase, enzyme involved in the synthesis of dihydroxynaphthalene (DNH) melanin, which was found to be upregulated in the secretome of the wild type and downregulated in the mutant. Differences in protein modulation were observed between K. chersonesos Wt and Mut, with several proteins being downregulated under LSSMG in the Mut when compared to the Wt. Lastly, no major morphological alterations were observed following exposure to LSSMG. Similarly, the strains' survivability was not negatively affected. This study is the first to characterize the response to simulated microgravity in black fungi, which might have implications on future astrobiological missions., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Tesei, Chiang, Kalkum, Stajich, Mohan, Sterflinger and Venkateswaran.)
- Published
- 2021
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209. Shed Light in the DaRk LineagES of the Fungal Tree of Life-STRES.
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Selbmann L, Benkő Z, Coleine C, de Hoog S, Donati C, Druzhinina I, Emri T, Ettinger CL, Gladfelter AS, Gorbushina AA, Grigoriev IV, Grube M, Gunde-Cimerman N, Karányi ZÁ, Kocsis B, Kubressoian T, Miklós I, Miskei M, Muggia L, Northen T, Novak-Babič M, Pennacchio C, Pfliegler WP, Pòcsi I, Prigione V, Riquelme M, Segata N, Schumacher J, Shelest E, Sterflinger K, Tesei D, U'Ren JM, Varese GC, Vázquez-Campos X, Vicente VA, Souza EM, Zalar P, Walker AK, and Stajich JE
- Abstract
The polyphyletic group of black fungi within the Ascomycota (Arthoniomycetes, Dothideomycetes, and Eurotiomycetes) is ubiquitous in natural and anthropogenic habitats. Partly because of their dark, melanin-based pigmentation, black fungi are resistant to stresses including UV- and ionizing-radiation, heat and desiccation, toxic metals, and organic pollutants. Consequently, they are amongst the most stunning extremophiles and poly-extreme-tolerant organisms on Earth. Even though ca. 60 black fungal genomes have been sequenced to date, [mostly in the family Herpotrichiellaceae (Eurotiomycetes)], the class Dothideomycetes that hosts the largest majority of extremophiles has only been sparsely sampled. By sequencing up to 92 species that will become reference genomes, the "Shed light in The daRk lineagES of the fungal tree of life" (STRES) project will cover a broad collection of black fungal diversity spread throughout the Fungal Tree of Life. Interestingly, the STRES project will focus on mostly unsampled genera that display different ecologies and life-styles (e.g., ant- and lichen-associated fungi, rock-inhabiting fungi, etc.). With a resequencing strategy of 10- to 15-fold depth coverage of up to ~550 strains, numerous new reference genomes will be established. To identify metabolites and functional processes, these new genomic resources will be enriched with metabolomics analyses coupled with transcriptomics experiments on selected species under various stress conditions (salinity, dryness, UV radiation, oligotrophy). The data acquired will serve as a reference and foundation for establishing an encyclopedic database for fungal metagenomics as well as the biology, evolution, and ecology of the fungi in extreme environments.
- Published
- 2020
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210. Peculiar genomic traits in the stress-adapted cryptoendolithic Antarctic fungus Friedmanniomyces endolithicus.
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Coleine C, Masonjones S, Sterflinger K, Onofri S, Selbmann L, and Stajich JE
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- Antarctic Regions, Exophiala genetics, Stress, Physiological genetics, Ascomycota genetics, Genome, Fungal genetics
- Abstract
Friedmanniomyces endolithicus is a highly melanized fungus endemic to the Antarctic, occurring exclusively in endolithic communities of the ice-free areas of the Victoria Land, including the McMurdo Dry Valleys, the coldest and most hyper-arid desert on Earth and accounted as the Martian analog on our planet. F. endolithicus is highly successful in these inhospitable environments, the most widespread and commonly isolated species from these peculiar niches, indicating a high degree of adaptation. The nature of its extremo tolerance has not been previously studied. To investigate this, we sequenced genome of F. endolithicus CCFEE 5311 to explore gene content and genomic patterns that could be attributed to its specialization. The predicted functional potential of the genes was assigned by similarity to InterPro and CAZy domains. The genome was compared to phylogenetically close relatives which are also melanized fungi occurring in extreme environments including Friedmanniomyces simplex, Baudoinia panamericana, Acidomyces acidophilus, Hortaea thailandica and Hortaea werneckii. We tested if shared genomic traits existed among these species and hyper-extremotolerant fungus F. endolithicus. We found that some characters for stress tolerance such as meristematic growth and cold tolerance are enriched in F. endolithicus that may be triggered by the exposure to Antarctic prohibitive conditions., Competing Interests: Declaration of Competing Interest The authors report no conflicts of interest. The authors alone are responsible for the content and the writing of the paper., (Copyright © 2020 British Mycological Society. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2020
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211. Draft Genome of Debaryomyces fabryi CBS 789T, Isolated from a Human Interdigital Mycotic Lesion.
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Tafer H, Sterflinger K, and Lopandic K
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The yeast genus Debaryomyces comprises species isolated from various natural habitats, man-made environments, and clinical materials. Here, the draft genome of D. fabryi CBS 789(T), isolated from a human interdigital mycotic lesion, is presented., (Copyright © 2016 Tafer et al.)
- Published
- 2016
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212. Unmasking the measles-like parchment discoloration: molecular and microanalytical approach.
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Piñar G, Sterflinger K, and Pinzari F
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- Aspergillus classification, Aspergillus genetics, Collagen, DNA, Bacterial analysis, DNA, Fungal analysis, Microscopy, Electron, Scanning, Saccharopolyspora classification, Saccharopolyspora genetics, Sodium Chloride, Aspergillus isolation & purification, Saccharopolyspora isolation & purification, Skin microbiology, Skin Pigmentation
- Abstract
Many ancient parchments are defaced by red or purple maculae associated with localized destruction of collagen fibres. Although the main characteristics of this damage were present in most of the manuscripts analysed by many authors, no common microbial or fungal denominator has been found so far, and little or no correspondence between the microbial or fungal species isolated from materials could be addressed. In this study, culture-independent molecular methods and scanning electron microscopy (SEM) were used to identify fungal and bacterial communities on parchments affected by the purple stains. Protocols for c extraction and nucleic-acid-based strategies were selected for assays examining the community structure of fungi and bacteria on biodeteriorated parchment. Both SEM and molecular analysis detected the presence of bacterial and fungal cells in the damaged areas. Halophilic, halotolerant proteolytic bacterial species were selected by the saline environment provided by the parchment samples. As common microbial denominators, members of the Actinobacteria, mainly Saccharopolyspora spp. and species of Aspergillus, were detected in all investigated cases. It is proposed that a relationship exists between the phenomenon of purple spots on ancient parchments and that of the 'red heat' phenomenon, known to be present in some products manufactured with marine salt., (© 2014 The Authors. Environmental Microbiology published by Society for Applied Microbiology and John Wiley & Sons Ltd.)
- Published
- 2015
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213. A combined approach to assess the microbial contamination of the archimedes palimpsest.
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Piñar G, Sterflinger K, Ettenauer J, Quandt A, and Pinzari F
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- Actinobacteria classification, Actinobacteria genetics, Biodiversity, Fungi classification, Fungi genetics, Proteobacteria classification, Proteobacteria genetics, RNA, Ribosomal, 16S genetics, Real-Time Polymerase Chain Reaction, Environmental Microbiology
- Abstract
A combined approach, using molecular and microscopic techniques, was used to identify the microbiota associated with the Archimedes Palimpsest, an unusual parchment manuscript. SEM analyses revealed the microbial damage to the collagen fibers and the presence of characteristic cell chains typical of filamentous bacteria and fungal spores. Molecular analysis confirmed a homogeneous bacterial community colonizing the manuscript. The phyla Proteobacteria and Actinobacteria were associated with this ancient parchment; the sequences were most related to uncultured clones detected in the human skin microbiome and in ephitelium, and to cultivated species of the genera Acinetobacter and Nocardiopsis. Nevertheless, a great variation was observed among the different sampled areas indicating fungal diversity. Blumeria spp. dominated in the healthy areas of the parchment while degraded areas showed disparate fungal communities, with dominant members of the genera Mucor and Cladosporium. In addition, the quantification of the β-actin gene by real-time PCR analyses (qPCR) revealed a higher fungal abundance on degraded areas than on the healthy ones.
- Published
- 2015
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214. Microbial deterioration of cultural heritage and works of art--tilting at windmills?
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Sterflinger K and Piñar G
- Subjects
- Archaea growth & development, Bacteria growth & development, Disinfection methods, Fungi growth & development, Humans, Archaea metabolism, Bacteria metabolism, Biodegradation, Environmental, Construction Materials microbiology, Environmental Microbiology, Fungi metabolism
- Abstract
Microorganisms (bacteria, archaea and fungi), in addition to lichens and insect pests, cause problems in the conservation of cultural heritage because of their biodeteriorative potential. This holds true for all types of historic artefacts, and even for art made of modern materials, in public buildings, museums and private art collections. The variety of biodeterioration phenomena observed on materials of cultural heritage is determined by several factors, such as the chemical composition and nature of the material itself, the climate and exposure of the object, in addition to the manner and frequency of surface cleaning and housekeeping in museums. This study offers a review of a variety of well-known biodeterioration phenomena observed on different materials, such as stone and building materials, objects exhibited in museums and libraries, as well as human remains and burial-related materials. The decontamination of infected artefacts, exhibition rooms and depots incurs high expenditure for museums. Nevertheless, the question has to be raised: whether the process of biodeterioration of cultural heritage can or should be stopped under all circumstances, or whether we have to accept it as a natural and an implicit consecution of its creation. This study also highlights critically the pros and cons of biocide treatments and gives some prominent examples of successful and unsuccessful conservation treatments. Furthermore, an outlook on the future research needs and developments in this highly interesting field is given.
- Published
- 2013
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215. Microcolonial fungi on rocks: a life in constant drought?
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Zakharova K, Tesei D, Marzban G, Dijksterhuis J, Wyatt T, and Sterflinger K
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- Desert Climate, Desiccation, Fluid Therapy, Fungal Proteins analysis, Fungi chemistry, Fungi growth & development, Fungi metabolism, Microbial Viability, Proteome analysis, Temperature, Environmental Microbiology, Fungi physiology
- Abstract
Black microcolonial fungi (MCF) and black yeasts are among the most stress-resistant eukaryotic organisms known on Earth. They mainly inhabit bare rock surfaces in hot and cold deserts of all regions of the Earth, but some of them have a close phylogenetic relation to human pathogenic black fungi which makes them important model organisms also with respect to clinical mycology. The environment of those fungi is especially characterized by extreme changes from humidity to long periods of desiccation and extreme temperature differences. A key to the understanding of MCF ecology is the question about metabolic activity versus dormancy in the natural environments. In this study, the time lag from the desiccated state to rehydration and full metabolic activity and growth was measured and defined in accordance with simulated environmental conditions. The ability to survive after desiccation and the speed of rehydration as well as changes of the whole cell protein pattern are demonstrated. Whereas both mesophilic strains--Exophiala jeanselmei and Knufia perforans (=Coniosporium perforans)--show a clear reaction toward desiccation by production of small proteins, Cryomyces antarcticus--the extremotolerant MCF--does not show any response to desiccation but seems just to down-regulate its metabolism. Data on intracellular sugar suggest that both trehalose and mannitol might play a cell protective role in those fungi.
- Published
- 2013
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216. Microcolonial fungi from antique marbles in Perge/Side/Termessos (Antalya/Turkey).
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Sert HB, Sümbül H, and Sterflinger K
- Subjects
- Phylogeny, Turkey, Archaeology, Calcium Carbonate analysis, Fungi classification, Fungi isolation & purification
- Abstract
In this study rock surfaces of archaeological sites in Antalya were investigated with a focus on black fungi for the first time. Black, meristematic fungi were isolated from surfaces of antique marble monuments in Antalya (Side, Perge, Termessos). Their morphology was characterized, their diversity was documented and the taxonomy and phylogeny of new isolates was clarified based on molecular methods, that is, by sequencing parts of the small ribosomal subunit (18S) and internal transcribed spacer (ITS) regions. From a total of around 250 samples 99 different fungal strains were isolated. In most of 99 strains the rDNA sequencing data and the lack of homologies in "Genbank" gave strong evidence that these strains have to be described as new species/subspecies and/or genera. All of them, however, clustered within the ascomycete orders of Dothideales, Chaetothyriales, and Pleosporales. Field studies show that these organisms cause color changes, black spots, crater shaped lesions as well as chipping and exfoliation of the rock surfaces in Antalya and thus they have to be regarded as a serious threat to the antique cultural heritage in Turkey.
- Published
- 2007
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217. Phylogeny and systematics of the fungi with special reference to the Ascomycota and Basidiomycota.
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Prillinger H, Lopandic K, Schweigkofler W, Deak R, Aarts HJ, Bauer R, Sterflinger K, Kraus GF, and Maraz A
- Subjects
- Ascomycota growth & development, Basidiomycota growth & development, Chytridiomycota classification, Chytridiomycota genetics, Chytridiomycota growth & development, DNA, Fungal genetics, DNA, Ribosomal genetics, Evolution, Molecular, Fungi growth & development, Genes, Fungal, RNA, Fungal genetics, RNA, Ribosomal, 18S genetics, Ascomycota classification, Ascomycota genetics, Basidiomycota classification, Basidiomycota genetics, Fungi classification, Fungi genetics, Phylogeny
- Published
- 2002
- Full Text
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