A5007285706- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Planetary Science and Exploration
- Mesoporous Materials and Catalysis
- Bone Tissue Engineering Materials
- Oxidative Organic Chemistry Reactions
- Calcium Carbonate Crystallization and Inhibition
- Paleontology and Stratigraphy of Fossils
- Clay minerals and soil interactions
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Chemical Synthesis and Reactions
- Magnetic and Electromagnetic Effects
- Iron oxide chemistry and applications
- Nanoparticle-Based Drug Delivery
- Catalytic Processes in Materials Science
- Algal biology and biofuel production
- Polyoxometalates: Synthesis and Applications
- Bone and Dental Protein Studies
- Minerals Flotation and Separation Techniques
- Aluminum Alloys Composites Properties
- Hydrocarbon exploration and reservoir analysis
- Iron Metabolism and Disorders
- Geochemistry and Geologic Mapping
- Soil and Unsaturated Flow
McGill University
2016-2025
Amirkabir University of Technology
2016
Institute for Advanced Studies in Basic Sciences
2012-2015
Université de Montréal
2015
Western University
2014
Royal Military College of Canada
2013
Austrian Centre for Electron Microscopy and Nanoanalysis
2008-2012
Institute of Cell Biology and Neurobiology
2010
Iran Polymer and Petrochemical Institute
2009
Sharif University of Technology
2009
Fresh fracture surfaces of the martian meteorite ALH84001 contain abundant polycyclic aromatic hydrocarbons (PAHs). These fresh also display carbonate globules. Contamination studies suggest that PAHs are indigenous to meteorite. High-resolution scanning and transmission electron microscopy study surface textures internal structures selected globules show fine-grained, secondary phases single-domain magnetite iron sulfides. The similar in texture size some terrestrial bacterially induced...
Although membrane-bounded compartments are commonly considered a unique eukaryotic characteristic, many species of bacteria have organelles. Compartmentalization is well studied in eukaryotes; however, the molecular factors and processes leading to organelle formation poorly understood. We use magnetosome magnetotactic as model system investigate biogenesis prokaryotic system. The an invagination cell membrane that contains specific set proteins able direct synthesis nanometer-sized...
Bacterial magnetosomes are intracellular compartments that house highly ordered magnetite crystals. By using Magnetospirillum sp. AMB-1 as a model system, we show magnetosome vesicles exist in the absence of magnetite, biomineralization proceeds simultaneously multiple vesicles, and from same location each vesicle. The magnetosome-associated protein, MamA, is required for formation functional displays dynamic subcellular localization throughout growth cycle magnetotactic bacteria. Together,...
The ejection of material from Mars is thought to be caused by large impacts that would heat much the ejecta high temperatures. Images magnetic field martian meteorite ALH84001 reveal a spatially heterogeneous pattern magnetization associated with fractures and rock fragments. Heating 40°C reduces intensity some features, indicating interior has not been above this temperature since before its surface Mars. Because cannot sterilize most bacteria or eukarya, these data support hypothesis...
Shewanella species are renowned for their respiratory versatility, including ability to respire poorly soluble substrates by using enzymatic machinery that is localized the outside of cell. The engage in “extracellular respiration” date has focused primarily on respiration minerals. Here, we identify two gene clusters oneidensis strain MR-1 each contain homologs genes required metal reduction and predicted encode dimethyl sulfoxide (DMSO) reductase subunits. Molecular genetic analyses these...
The understanding of the interactions between nanomaterials and proteins is extreme importance in medicine. In a biological fluid, can adsorb associate with nanoparticles, which have significant impact on behavior nanoparticles. We report here iron saturated human transferrin protein both bare polyvinyl alcohol coated superparamagnetic oxide nanoparticles (SPIONs). exposure to SPIONs results release iron, changes main function protein, transport among cells. After removal magnetic original...
Novel spherical assemblies of CdS-containing block copolymer reverse micelles in aqueous solution have been formed by the slow addition water to mixtures and a polystyrene-b-poly(acrylic acid) stabilizer. The structures are large compound (LCMs) with quantum-confined CdS nanoparticles dispersed throughout PS matrix, which is stabilized layer solubilized hydrophilic chains. size particles (2RCdS ∼ 3 nm) controlled ionic length, NB, making up micelle. LCM formation found be dependent on amount...
Cellulose nanocrystals (CNCs), derived from cellulose, provide us with an opportunity to devise more sustainable solutions current technological challenges. Enantioselective catalysis, especially heterogeneous, is the preferred method for synthesis of pure chiral molecules in fine chemical industries. has been long sought as a inducer enantioselective catalysis. We report herein unprecedentedly high enantiomeric excess (ee) Pd patches deposited onto CNCs used catalysts hydrogenation...
Abstract Chirality is ubiquitous in biology, including biomineralization, where it found many hardened structures of invertebrate marine and terrestrial organisms (for example, spiralling gastropod shells). Here we show that chiral, hierarchically organized architectures for calcium carbonate (vaterite) can be controlled simply by adding chiral acidic amino acids (Asp Glu). Chiral, vaterite toroidal suprastructure having a ‘right-handed’ (counterclockwise) morphology induced L -enantiomers...
A novel ionic liquid functionalized magnetic nanoparticle was prepared by anchoring an imidazolium bearing triethylene glycol moieties on the surface of silica-coated iron oxide nanoparticles. The material proved to be effective host for immobilization a Pd catalyst through subsequent simple ion-exchange process giving highly water dispersible, active and yet magnetically recoverable (Mag-IL-Pd) in Suzuki–Miyaura coupling reaction water. as-prepared displayed remarkable activity toward...
Plant growth-promoting bacteria (PGB) induce positive effects in plants, for instance, increased growth and reduced abiotic stresses susceptibility. The mechanisms by which these impact the host plant are numerous, diverse often specific. Here, we studied agronomical, molecular biochemical of endophytic PGB Bacillus subtilis B26 on full life cycle Brachypodium distachyon Bd21, an established model species functional genomics cereal crops temperate grasses. Inoculation with B. strain root...
Tropocollagen types I and III were simultaneously fibrilized in vitro, the differences between geometric mechanical properties of heterotypic fibrils with different mixing ratios tropocollagen to investigated. Transmission electron microscopy was used confirm simultaneous presence both within fibrils. The incorporation collagen caused be thinner a shorter D-banding than pure I. Hertzian contact model obtain elastic moduli from atomic force microscope indentation testing using volume...
Superparamagnetic iron oxide nanoparticles (SPIONs) are recognized as promising nanodiagnostic materials due to their biocompatibility, unique magnetic properties, and application multimodal contrast agents. As coated SPIONs have potential use in the diagnosis treatment of various brain diseases such Alzheimer's, a comprehensive understanding interactions with Aβ other amyloidogenic proteins is essential prior clinical application. Here we demonstrate effect thickness surface charge coating...
Engineered nanoparticles are increasingly being considered for use as biosensors, imaging agents and drug delivery vehicles. Their versatility in design applications make them an attractive proposition new biological biomedical approaches. Despite the remarkable speed of development nanoscience, relatively little is known about interaction nanoscale objects with living systems. In a fluid, proteins associate nanoparticles, amount presentation on their surface could lead to different vivo...
We aimed to investigate the physicochemical effects of superparamagnetic iron oxide nanoparticles (SPIONs) on composition protein corona and their correspondence toxicological issues.SPIONs different sizes surface charges were exposed fetal bovine serum. The structure/composition biological corona-SPION complexes probed.The affinity level adsorption specific proteins is strongly dependent size charge SPIONs. In vivo experiments mouse blood-brain barrier model revealed that nontargeted SPIONs...
Novel heterogeneous catalyst systems comprised of palladium nanoparticles immobilized into the nanospaces imidazolium-based bifunctional plugged and unplugged periodic mesoporous organosilicas (BFPMO) have been described for selective aerobic oxidation alcohols in water. BFPMOs were characterized by N2 adsorption–desorption analysis, transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), thermal gravimetric analysis (TGA), 29Si 13C cross-polarization magic angle spinning...
Turnip mosaic virus (TuMV) reorganizes the endomembrane system of infected cell to generate endoplasmic-reticulum–derived motile vesicles containing viral replication complexes. The membrane-associated protein 6K2 plays a key role in formation these vesicles. Using confocal microscopy, we observed that this protein, marker for complexes, localized extracellular space Nicotiana benthamiana leaves. Previously, showed RNA is associated with multivesicular bodies (MVBs). Here, using transmission...
The biomineral phase of avian eggshell is characterized at the nanostructure scale and correlated with functional properties.