A5047276270- thermodynamics and calorimetric analyses
- Viral gastroenteritis research and epidemiology
- Paleontology and Stratigraphy of Fossils
- Calcium Carbonate Crystallization and Inhibition
- Bone Tissue Engineering Materials
- Parasites and Host Interactions
- Geochemistry and Elemental Analysis
- Microbial Community Ecology and Physiology
- Oral microbiology and periodontitis research
- Bacterial biofilms and quorum sensing
- Probiotics and Fermented Foods
- Urinary Tract Infections Management
- Building materials and conservation
- Parasite Biology and Host Interactions
- Microbial Applications in Construction Materials
- Physiological and biochemical adaptations
- Helminth infection and control
- Liver Disease Diagnosis and Treatment
- Dental Implant Techniques and Outcomes
- Plant Diversity and Evolution
- Geology and Paleoclimatology Research
- Essential Oils and Antimicrobial Activity
- Field-Flow Fractionation Techniques
- Antibiotics Pharmacokinetics and Efficacy
- Hydrocarbon exploration and reservoir analysis
University of Basel
2016-2025
University of Lausanne
2021-2023
University Hospital of Lausanne
1999-2023
University Hospital of Basel
2011-2016
Medicoat (Switzerland)
2013
University of Connecticut
2007-2013
Hospital Base
2012-2013
Isfahan University of Medical Sciences
2012
Biomechanics Institute of Valencia
2012
University of Neuchâtel
2002-2006
ABSTRACT Sulfate‐reducing bacteria (SRB) have been recognized as key players in the precipitation of calcium carbonate lithifying microbial communities. These increase alkalinity by reducing sulfate ions, and consuming organic acids. SRB also produce copious amounts exopolymeric substances (EPS). All these processes influence morphology mineralogy minerals. Interactions EPS with metals, particular, are believed to be main through which extracellular matrix controls exopolymers were purified...
This study stresses the role of specific bacterial outer structures (such as glycocalix and parietal polymers) on calcium carbonate crystallization in terrestrial environments. The aim is to compare crystals obtained cultures with those during abiotically mediated synthesis show implications exopolysaccharides amino acids mineralogy morphology produced by living bacteria. done using various amounts purified exopolysaccharide (xanthan EPS) L-amino a range acidities. Amino increasing xanthan...
It has been hypothesized that zirconia might have a reduced bacterial adhesion compared with titanium; however, results from experimental studies are rather controversial. The aim of the present study is to compare biofilm formation on and titanium implant surfaces using an in vitro three-species human plaque samples.Experimental disks made (Ti) or (ZrO2) machined (M) sandblasted (SLA) acid-etched (ZLA) surface topography were produced. An samples applied for each type disk, which after 72...
Abstract Mineral precipitation in microbial mats may have been the key to their preservation as fossil stromatolites, potentially documenting evidence of earliest life on E arth. Two factors that contribute carbonate mineral are saturation index ( SI ) and presence nucleation sites. Both these can be influenced by micro‐organisms, which either alter through metabolisms, or produce consume organic substances such extracellular polymeric EPS affect nucleation. It is balance individual...
The properties and microbial turnover of exopolymeric substances (EPS) were measured in a hypersaline nonlithifying mat (Eleuthera, Bahamas) to investigate their potential role calcium carbonate (CaCO3) precipitation. Depth profiles EPS abundance enzyme activities indicated that c. 80% the turned over upper 15–20 mm. Oxic anoxic homogenates amended with low-molecular-weight (LMW) organic carbon, sugar monomers, different types revealed rapid consumption all substrates. When comparing other...
ABSTRACT Spores of the arbuscular mycorrhizal fungi (AMF) Glomus geosporum and constrictum were harvested from single-spore-derived pot cultures with either Plantago lanceolata or Hieracium pilosella as host plants. PCR-denaturing gradient gel electrophoresis analysis revealed that bacterial communities associated spores depended more on AMF than plant identity. The composition populations linked to could be predominantly influenced by a specific spore wall exudate rather root exudates....
ABSTRACT Iroko trees ( Milicia excelsa ) in Ivory Coast and Cameroon are unusual because of their highly biomineralized tissues, which can virtually transform the trunk into stone. Oxalic acid (C 2 O 4 H metal‐oxalate play important roles ecosystems. In this study, various forms oxalate carbonate mineralization reactions investigated by using scanning electron microscopy X‐ray diffraction. Calcium monohydrate is associated with stem, bark root whereas calcium dihydrate found wood rot fungi...
Abstract Needle fibre calcite is one of the most ubiquitous habits in vadose environments (caves deposits, soil pores, etc.). Its origin, either through inorganic, indirect or direct biological processes, has long been debated. In this study, investigations at 11 sites Europe, Africa and Central America support arguments for its biogenic origin. The wide range needle morphologies result a gradual evolution simplest type, rod. This rod elementary brick which, by aggregation welding, builds...
Abstract Microbial metabolism impacts the degree of carbonate saturation by changing total alkalinity and calcium availability; this can result in precipitation minerals thus formation microbialites. Here, microbial metabolic activity, characteristics turnover extracellular polymeric substances physicochemical conditions water column sediments a hypersaline lake, Big Pond, Bahamas, were determined to identify driving forces microbialite formation. A conceptual model for organomineralization...
Isothermal microcalorimetry is a label-free assay that allows monitoring of enzymatic and metabolic activities. The technique has strengths, but most instruments have low throughput, which limited their use for bioassays. Here, an isothermal microcalorimeter, equipped with vessel holder similar to 48-well plate, was used. increased throughput this microcalorimeter makes it valuable biomedical pharmaceutical applications. Our results show the sensitivity instrument detection 3 × 10(4)...
Abstract In modern stromatolites, mineralization results from a complex interplay between microbial metabolisms, the organic matrix, and environmental parameters. Here, we combined biogeochemical, mineralogical, microscopic analyses with measurements of metabolic activity to characterize processes products in an emergent (<18 months) hypersaline mat. While nucleation Mg silicates is ubiquitous mat, initial formation Ca‐Mg carbonate lamina depends on (i) creation high‐pH interface major...
Abstract. An African oxalogenic tree, the iroko tree (Milicia excelsa), has property to enhance carbonate precipitation in tropical oxisols, where such accumulations are not expected due acidic conditions these types of soils. This uncommon process is linked oxalate-carbonate pathway, which increases soil pH through oxalate oxidation. In order investigate pathway system, fluxes matter have been identified, described, and evaluated from field microscopic scales. first centimeters profile,...
ABSTRACT Alternative antischistosomal drugs are required since praziquantel is virtually the only drug available for treatment and morbidity control of schistosomiasis. Manual microscopic reading current “gold standard” to assess in vitro properties test drugs; however, it labor-intensive, subjective, difficult standardize. Hence, there a need develop novel tools discovery. The effects praziquantel, oxamniquine, artesunate, mefloquine on metabolic activity parasite motility Schistosoma...
This research aims to assess total‐cadmium soil content and microbiological aspects understand the dynamics of culturable cadmium‐tolerant bacteria (CdtB) in cacao soils from northeastern Colombia. An integration inverted dish plating, Cd determination a microcalorimetry assay (IMC) was carried out. A farm Boyacá showed highest level total (3·74 mg kg−1) followed by farms Santander Arauca (2·76 1·16 kg−1, respectively). Coefficient between CFU CdtB high (R2 = 0·83) for Boyacá. Moreover, pool...