Fadwa Jroundi

Fadwa Jroundi
University of Granada | UGR · Department of Microbiology

PhD

About

93
Publications
8,270
Reads
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1,108
Citations
Citations since 2016
37 Research Items
875 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (93)
Article
Precipitation of calcium carbonate minerals by bacteria, the so-called bacterial carbonatogenesis, is a promising method for the consolidation of decayed stone. Despite extensive laboratory testing that has demonstrated the efficacy of this method, little is, however, known regarding the medium- and/or long-term performance of this bacterial conser...
Article
Gypsum plasterworks and decorative surfaces are easily degraded, especially when exposed to humidity, thereby requiring protection and/or consolidation. However, the conservation of historical gypsum-based structural and decorative materials by conventional organic and inorganic consolidants shows limited efficacy. Here a new method based on the bi...
Article
Uranium (U) roll-front deposits constitute a valuable source for an economical extraction by in situ recovery (ISR) mining. Such technology may induce changes in the subsurface microbiota, raising questions about the way their activities could build a functional ecosystem in such extreme environments (i.e.: oligotrophy and high SO4 concentration an...
Article
Selenium, ⁷⁹Se, is one of the most critical radionuclides in radioactive waste disposed in future deep geological repositories (DGRs). Here, we investigate the impact of bentonite microbial communities on the allotropic transformation of Se(IV) bioreduction products under DGR relevant conditions. In addition, Se amendment-dependent shifts in the be...
Article
Selenate (Se(VI)) is one of the most soluble and toxic species of Se. Microbial Se(VI) reduction is an efficient tool for bioremediation strategies. However, this process is limited to a few microorganisms, and its molecular basis remains unknown. We present detailed Se(VI)-resistance mechanisms under 50 and 200 mM, in Stenotrophomonas bentonitica...
Article
Earth has been an important construction material throughout history. Being a relatively fragile material, it can undergo extensive weathering depending on prevailing climate conditions, consequently requiring constant maintenance and often consolidation. The latter is still one of the most challenging tasks in the conservation field. Here we compa...
Article
Full-text available
Uranium (U) is the most hazardous radionuclide in nuclear waste and its harmful effects depend on its mobility and bioavailability. Microorganisms can affect the speciation of radionuclides and their migration in Deep Geological Repositories (DGR) for high level radioactive waste (HLW) storage. Consequently, a better understanding of microbe-radion...
Chapter
Biomineralization mediated by microorganisms is ubiquitous in nature. This process mostly encompasses phosphate, carbonate, silica and sulphate precipitation as well as iron mineralization. The mechanisms by which microbial biominerals are formed include intracellular and extracellular biomineralization. Minerals produced by microorganisms are ofte...
Article
Full-text available
Much stone sculptural and architectural heritage is crumbling, especially in intense tropical environments. This is exemplified by significant losses on carvings made of tuff stone at the Classic Maya site of Copan. Here we demonstrate that Copan stone primarily decays due to stress generated by humidity-related clay swelling resulting in spalling...
Chapter
Full-text available
For millennia, artists and architects around the world used natural stone for the carving of sculptures and the construction of monuments, such as Roman, Greek, and Maya temples, the European cathedrals, and the Taj Mahal, just to name a few. Currently, the survival of these irreplaceable cultural and historical assets is under threat due to their...
Chapter
Clays are commonly used in design concepts for geological disposal of nuclear waste. It is thus essential to identify and quantify microbial communities in clay-rich samples to study microbial processes during geological disposal. Although advances in culture-independent techniques have enabled detailed studies of microbial communities in diverse e...
Article
Full-text available
Radionuclides (RNs) generated by nuclear and civil industries are released in natural ecosystems and may have a hazardous impact on human health and the environment. RN-polluted environments harbour different microbial species that become highly tolerant of these elements through mechanisms including biosorption, biotransformation, biomineralizatio...
Article
Full-text available
To overcome the limitations of traditional conservation treatments used for protection and consolidation of stone and lime mortars and plasters, mostly based on polymers or alkoxysilanes, a novel treatment based on the activation of indigenous carbonatogenic bacteria has been recently proposed and applied both in the laboratory and in situ. Despite...
Article
Full-text available
Compacted bentonites are one of the best sealing and backfilling clays considered for use in Deep Geological Repositories of radioactive wastes. However, an in-depth understanding of their behavior after placement in the repository is required, including if the activity of indigenous microorganisms affects safety conditions. Here we provide an opti...
Article
Full-text available
Mechanisms underlying barite precipitation in seawater and the precise depths of barite precipitation in the water column have been debated for decades. Here we present a detailed study of water column barite distribution in the mesopelagic zone at diverse stations in the open ocean by analyzing samples collected using multiple unit large volume in...
Article
Full-text available
The potential use of microorganisms in the bioremediation of U pollution has been extensively described. However, a lack of knowledge on molecular resistance mechanisms has become a challenge for the use of these technologies. We reported on the transcriptomic and microscopic response of Stenotrophomonas bentonitica BII-R7 exposed to 100 and 250 μM...
Article
The environmental impact of uranium released during nuclear power production and related mining activity is an issue of great concern. Innovative environmental-friendly water remediation strategies, like those based on U biomineralization through phosphatase activity, are desirable. Here, we report the great U biomineralization potential of Stenotr...
Article
A uranium-mineralized sandy aquifer, planned for mining by means of uranium in situ recovery (U ISR), harbors a reservoir of bacterial life that may influence the biogeochemical cycles surrounding uranium roll-front deposits. Since microorganisms play an important role at all stages of U ISR, a better knowledge of the resident bacteria before any I...
Preprint
Background Uranium-mineralized sandy aquifer, planned for a mining by in situ recovery (U ISR), harbors a reservoir of bacterial life that may influence the biogeochemical cycles surrounding the Uranium roll front deposits. Since microorganisms are likely to play an important role at all stages of U ISR, a better knowledge of the resident bacteria...
Article
The role of microbial processes in bioaccumulation of major and trace elements has been broadly demonstrated. However, microbial communities from marine sediments have been poorly investigated to this regard. In marine environments, particularly under high anthropogenic pressure, heavy metal accumulation increases constantly, which may lead to sign...
Article
The multi-barrier deep geological repository system is currently considered as one of the safest option for the disposal of high-level radioactive wastes. Indigenous microorganisms of bentonites, may affect the structure and stability of these clays through Fe-containing minerals biotransformation and radionuclides mobilization. The present work ai...
Article
Ocean export production is a key constituent in the global carbon cycle impacting climate. Past ocean export production is commonly estimated by means of barite and Barium proxies. However, the precise mechanisms underlying barite precipitation in the undersaturated marine water column are not fully understood. Here we present a detailed mineralogi...
Article
Full-text available
Ba proxies have been broadly used to reconstruct past oceanic export production. However, the precise mechanisms underlying barite precipitation in undersaturated seawater are not known. The link between bacterial production and particulate Ba in the ocean suggests that bacteria may play a role. Here we show that under experimental conditions marin...
Article
Full-text available
Enhanced salt weathering resulting from global warming and increasing environmental pollution is endangering the survival of stone monuments and artworks. To mitigate the effects of these deleterious processes, numerous conservation treatments have been applied that, however, show limited efficacy. Here we present a novel, environmentally friendly,...
Article
Full-text available
Deep geological repository (DGR) is one of the internationally accepted options to dispose radioactive wastes. Bentonite formations from Almeria, Spain, were selected as reference material for artificial barriers for the future Spanish repository. However, the safety of this long-term disposal could be compromised not only by physicochemical factor...
Article
The present work describes lead phosphate biomineralization by a wood-decaying fungal isolate, Penicillium chrysogenum A15, after incubation in solid medium with metallic lead (Pb shot pellets). This fungal isolate showed high tolerance to this element, being able to grow on solid medium containing 8 mM Pb(II). Environmental Scanning Electron Micro...
Conference Paper
The present work consists in the isolation and characterization of bacterial strains from porewaters sampled in the vicinity of two French uranium tailing repositories. Since microbes are known to affect decisively uranium fate and behavior in these environments, their identification and characterization is considered the first logical step for the...
Article
Full-text available
Biomineralization processes have recently been applied in situ to protect and consolidate decayed ornamental stone of the Royal Chapel in Granada (Spain). While this promising method has demonstrated its efficacy regarding strengthening of the stone, little is known about its ecological sustainability. Here, we report molecular monitoring of the st...
Article
Marine bacteria isolated from natural seawater were used to test their capacity to promote barite precipitation under laboratory conditions. Seawater samples were collected in the western and eastern Mediterranean at 250m and 200m depths, respectively, since marine barite formation is thought to occur in the upper water column. The results indicate...
Article
Salt weathering is an important mechanism contributing to the degradation and loss of stone building materials. In addition to the physical weathering resulting from crystallization pressure, the presence of salts in solution greatly enhances the chemical weathering potential of pore waters. Flow through experiments quantify the dissolution rates o...
Article
Stone consolidation treatments that use bacterial biomineralization are mainly based on two strategies: (1) the inoculation of a bacterial culture with proven carbonatogenic ability and/or (2) the application of a culture medium capable of activating those bacteria able to induce the formation of calcium carbonate, from amongst the bacterial commun...
Article
The influence of mineral substrate composition and structure on bacterial calcium carbonate productivity and polymorph selection was studied. Bacterial calcium carbonate precipitation occurred on calcitic (Iceland spar single crystals, marble, and porous limestone) and silicate (glass coverslips, porous sintered glass, and quartz sandstone) substra...
Data
Explanation of marked and numbered bands from Fig. 4A and B. The bands are explained in this table, describing the clone designation, the sequence length, the closest relative — as determined by comparative sequence analysis (partly including reference), the phylum of the clone, the similarity ranking, the accession numbers of each identified clone...
Data
Explanation of marked and numbered bands shown in Fig. 3A and B. The bands are explained in this table, describing the clone designation, the sequence length, the closest relative — as determined by comparative sequence analysis (partly including reference), the phylum of the clone, the similarity ranking, the accession numbers of each identified c...
Article
Full-text available
Microbially Induced Carbonate Precipitation is proposed as an environmentally friendly method to protect decayed ornamental stone and introduced in the field of preservation of Cultural Heritage. Recent conservation studies performed under laboratory conditions on non-sterile calcarenite stones have successfully reported on the application of a sui...
Chapter
Calcium carbonate precipitation is a common phenomenon in nature and has been observed to be mediated by a number of microorganisms (for a review, see Castanier et al. 2000; Wright and Oren 2005). Bacterially induced carbonate mineralization is important in a wide range of processes including atmospheric CO2 budgeting (Braissant et al. 2002; Ehrlic...
Article
Full-text available
In this study, we investigated under laboratory conditions the bacterial communities inhabiting quarry and decayed ornamental carbonate stones before and after the application of a Myxococcus xanthus-inoculated culture medium used for consolidation of the stones. The dynamics of the community structure and the prevalence of the inoculated bacterium...
Article
Full-text available
The deterioration of the stone built and sculptural heritage has prompted the search and development of novel consolidation/protection treatments that can overcome the limitations of traditional ones. Attention has been drawn to bioconservation, particularly bacterial carbonatogenesis (i.e. bacterially induced calcium carbonate precipitation), as a...