A5067500844- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Building materials and conservation
- Crystallization and Solubility Studies
- Mineralogy and Gemology Studies
- Geological and Geochemical Analysis
- Bone Tissue Engineering Materials
- Calcium Carbonate Crystallization and Inhibition
- Lichen and fungal ecology
- Physics of Superconductivity and Magnetism
- Chemical Thermodynamics and Molecular Structure
- Clay minerals and soil interactions
- Cultural Heritage Materials Analysis
- Synthesis and Characterization of Heterocyclic Compounds
- Conservation Techniques and Studies
- Glass properties and applications
- Thermal and Kinetic Analysis
- Chemical Synthesis and Characterization
- Synthesis and biological activity
- Biocrusts and Microbial Ecology
- Endodontics and Root Canal Treatments
- Kidney Stones and Urolithiasis Treatments
- High-pressure geophysics and materials
- Microbial Applications in Construction Materials
- Superconducting Materials and Applications
St Petersburg University
2016-2025
Institute of Chemistry of Silicates named after I.V. Grebenshchikov
2015-2021
Herzen University
2021
Physicotechnical Institute
1997
Russian Academy of Sciences
1997
Freie Universität Berlin
1995
A.E. Favorsky Irkutsk Institute of Chemistry
1977-1979
Pushkin Leningrad State University
1977
Thermal stability, structural evolution pathways, and phase transition mechanisms of the calcium oxalates whewellite (CaC2O4·H2O), weddellite (CaC2O4·(2+x)H2O), caoxite (CaC2O4·3H2O) have been analyzed using single crystal powder X-ray diffraction (XRD). During XRD heating experiments, α-CaC2O4 novel oxalate monohydrate obtained structurally characterized for first time. The highest thermal expansion these compounds is observed along direction hydrogen bonds, whereas lowest even contraction...
Soil fungi are significantly resistant to heavy metals, which allows them be used in biotechnologies for environmental bioremediation. In order clarify the prospects using Zn-detoxifying technologies, we investigated vitro effect of fungal metabolism on Zn minerals formation. The cultivation with different acid-producing activities (Aspergillus niger and Penicillium chrysogenum) was carried out a liquid Czapek–Dox nutrient medium concentrations from 250 2000 µmol within 28 days. quantitates...
Carbonated fluorapatite−gelatine nanocomposites were grown by the double-diffusion technique within a gelatine gel. The carbonate content was varied, whereas all other experimental parameters (Ca2+, [PO4]3−, F− concentrations, gel concentration, pH, temperature, and growth time) kept constant. composite aggregates so-called Liesegang bands characterized XRD, chemical analysis, FT-IR Raman spectroscopy, TG/DTA/MS, SEM TEM. In carbonated fluorapatite-gelatine ions replace phosphate groups...
The crystallization of calcium oxalates (weddellite and whewellite) by interaction calcite marble with fungus Aspergillus niger, one the most active stone destructors, was studied under in vitro conditions. temporal development acid production as well sequence formation morphogenesis growing oxalate hydrates crystals were investigated detail. Furthermore, relationships between morphology growth conditions within biofilms on surface carbonate rocks are discussed.
The refinement of the structures 17 weddellite crystals [Ca(C2O4)·(2+x)H2O, I4/m, a = 12.329-12.378 Å, c 7.345-7.366 V 1117.8-1128.6 Å3], which were taken from oxalic renal stones St. Petersburg (Russian Federation) citizens both sexes aged 24 to 65 years, has been carried out by means single-crystal X‑ray diffraction (R1 0.024-0.057). According results study, amount "zeolitic" water molecules (x) in structure varies 0.13 0.37 pfu. A significant positive correlation between and closest...
Abstract Drug resistance and damage caused to the normal cells are drawbacks which have limited use of existing effective anticancer drugs. Attainment a steady extended release by encapsulating dual drugs into biocompatible biodegradable vehicles is key enable these for inhibition cancer. In this study, carboxymethyl chitosan (CMCS), proficient water-soluble derivative has been synthesized using chemical route used delivery 5-Fluorouracil doxorubicin individually as well in combination....
Rock surfaces in natural systems are inhabited by multispecies communities of microorganisms. The biochemical activity microorganisms and the patterns microbial crystallization these mostly unexplored. Patterns calcium carbonate oxalate induced bacteria Bacillus subtilis B. together with Aspergillus niger on marble surface vitro liquid medium humidity chamber—were studied. Phase identification was supported XRD, SEM, EDXS; metabolite composition determined GC–MS. It found that subtilis–A....
Abstract The origin of anomalous birefringence grossular–andradite (grandite) garnets from skarns in Mali and Russia was considered. crystals had complex superposition two phenomena: mismatch compositional strain (stress birefringence) growth ordering atoms (growth dissymmetrization). Study the using several experimental techniques (optical microscopy, microprobe analysis, X-ray diffraction topography single crystal diffraction) as well calculations has confirmed this hypothesis. Depending...
The present work contributes to the essential questions on calcium oxalate formation under influence of lithobiont community organisms. We have discovered oxalates in lichen thalli surfaces apatite-nepheline rocks southeastern and southwestern titanite-apatite ore fields Khibiny peralkaline massif (Kola Peninsula, NW Russia) for first time; investigated biofilm with different methods (X-ray powder diffraction, scanning electron microscopy, EDX analysis) discussed morphogenetic patterns its...
The crystal structures of two elbaites from the Paraiba deposit with copper contents 3.51 and 1.61 wt% CuO [a = 15.881(1), 15.840(3); c 7.112(1), 7.1028(9), respectively], as well a synthetic Cu-bearing olenite content 8.39 15.840(4), 7.091(1)] have been refined to R-indices 2.2, 3.1, 4.1% using X‑ray single-crystal diffraction. On basis original published data (for six structures) crystal-chemical relationships copper-bearing tourmalines has analyzed. It is shown that cations other 3d...
A synthetic Cu-rich tourmaline crystal (Lebedev et al. 1988) consists of three different zones. Each zone was characterized by EMPA, SIMS, and single-crystal structure refinement (SREF). The first (which crystallized directly on the seed crystal) has formula ~ X (Na 0.8 □ 0.2 ) Y (Al 2.0 Cu 0.9 0.1 Z Al 6 T (Si 5.1 )O 18 (BO 3 V (OH) W [O 0.7 F ] with lattice parameters a 15.835(1), c 7.093(1) ( R = 2.4%). second 1.8 1.1 B [(OH) 0.4 0.3 O 15.824(1), 7.087(1) 2.3%). third (highest content ~14...
Abstract The crystal structure of synthetic Ni-rich tourmaline with a nickel content 18.96 wt.% NiO ( = 15.890(2), c 7.1815(8) Å) has been refined to R 3.1% using single-crystal X-ray diffraction data. It shown that Ni is distributed not only over the Y , but also Z sites according ideal formula Na(Ni 2 2+ Al)(Al 5 )(Si 6 O 18 )(BO 3 ) (OH) 4 . Based on bond valences and charge balance analysis it this composition corresponds stable disordered member solid solution series NaAl Al (Si (O)...