Dmitry S. Volkov
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View article: Diversity of CRISPR-Cas Systems Identified in Urological Escherichia coli Strains
Diversity of CRISPR-Cas Systems Identified in Urological Escherichia coli Strains Open
Type I-E and I-F CRISPR-Cas systems were identified in 237 E. coli strains isolated from patients with urinary tract infections (UTIs) between 2004 and 2019. The strains were classified into nine distinct groups (I–IX) based on the presenc…
View article: Diversity of CRISPR-Cas Systems Identified in Urological <em>Escherichia coli</em> Strains
Diversity of CRISPR-Cas Systems Identified in Urological <em>Escherichia coli</em> Strains Open
The type I-E and I-F CRISPR-Cas systems were identified in 237 E. coli strains isolated from patients with urinary tract infections (UTIs) between 2004 and 2019. The strains were classified into nine distinct groups (I-IX) based on the pre…
View article: ANALYSIS OF THE ECOLOGICAL STATE OF THE TERRITORY FOR PRE-PROJECT WORK ON THE DEVELOPMENT OF THE RECREATIONAL ZONE OF THE BOGDINSKO-BASKUNCHAKSKY NATURE RESERVE
ANALYSIS OF THE ECOLOGICAL STATE OF THE TERRITORY FOR PRE-PROJECT WORK ON THE DEVELOPMENT OF THE RECREATIONAL ZONE OF THE BOGDINSKO-BASKUNCHAKSKY NATURE RESERVE Open
The article analyzes the increase in disturbed lands in the Bogdinsko-Baskunchaksky Reserve, where unique ecosystems are exposed to the negative impact of anthropogenic factors associated with the growth of tourism. The study identifies ke…
View article: Laboratory Modeling of the Bazhenov Formation Organic Matter Transformation in a Semi-Open System: A Comparison of Oil Generation Kinetics in Two Samples with Type II Kerogen
Laboratory Modeling of the Bazhenov Formation Organic Matter Transformation in a Semi-Open System: A Comparison of Oil Generation Kinetics in Two Samples with Type II Kerogen Open
In this study, Kerogen conversion and oil production laboratory modeling results in Bazhenov formation source rock samples (Western Siberia, Russia) are presented. Two samples from one well with a similar composition and immature type II k…
View article: Effect of Temperature on Kerogen Transformation and Hydrocarbon Generation in Bazhenov Formation (Western Siberia, Russia) Rocks During Hydrous Pyrolysis
Effect of Temperature on Kerogen Transformation and Hydrocarbon Generation in Bazhenov Formation (Western Siberia, Russia) Rocks During Hydrous Pyrolysis Open
The aim of this investigation is to determine the role of temperature in hydrocarbon generation in Bazhenov formation source rocks, as hydrothermal processes in situ are supposed to be the main contributor to kerogen transformation in West…
View article: Fast High-Resolution pKa Spectrotitrimetry for Quantification of Surface Functional Groups of Retisols
Fast High-Resolution pKa Spectrotitrimetry for Quantification of Surface Functional Groups of Retisols Open
Potentiometric titration in a fast and simultaneously high-resolution modality was proposed for the identification and quantification of protolytic groups of variable strength at the surface of primary soil particles. The method is impleme…
View article: Humic Polyelectrolytes Facilitate Rapid Microwave Synthesis of Silver Nanoparticles Suitable for Wound-Healing Applications
Humic Polyelectrolytes Facilitate Rapid Microwave Synthesis of Silver Nanoparticles Suitable for Wound-Healing Applications Open
This article describes the one-pot microwave synthesis of silver nanoparticles (AgNPs) assisted with natural polyelectrolytes—humic substances (HS). The humic polyelectrolytes served both as chemical reductants for silver ions and as end-c…
View article: Organic matter and mineral matrix of soils: modern approaches, definitions of terms and methods of study (review)
Organic matter and mineral matrix of soils: modern approaches, definitions of terms and methods of study (review) Open
Due to the complexity and heterogeneity of soil organic matter, a very wide range of methods and approaches is used to study it. This generates an excessive number of terms, definitions and indices, which makes it difficult to understand a…
View article: Element Composition of Fractionated Water-Extractable Soil Colloidal Particles Separated by Track-Etched Membranes
Element Composition of Fractionated Water-Extractable Soil Colloidal Particles Separated by Track-Etched Membranes Open
Membrane fractionation with track-etched membranes was used to size-profile the microelement composition of water-extractable soil colloids (WESCs). The aim of the study is the element composition of narrow WESC fractions of typical cherno…
View article: Chernozem Land Use Differentiation by Temperature-Dependent IR Spectra
Chernozem Land Use Differentiation by Temperature-Dependent IR Spectra Open
Granulometric aggregate fractions (20 µm–2 mm) of chernozem soils with different agriculture-use histories (native steppe, permanent bare fallow, arable land, and shelterbelt) were investigated in mid-IR and far IR regions (4000–100 cm−1) …
View article: Temperature Dependences of IR Spectral Bands of Humic Substances of Silicate-Based Soils
Temperature Dependences of IR Spectral Bands of Humic Substances of Silicate-Based Soils Open
Temperature-dependent IR spectroscopy capable of revealing specific changes in the band intensities, positions, and shape was used to increase the information on humic substances (HS) from soils. Temperature dependences of IR spectra of HS…
View article: Two-Dimensional Correlation IR Spectroscopy of Humic Substances of Chernozem Size Fractions of Different Land Use
Two-Dimensional Correlation IR Spectroscopy of Humic Substances of Chernozem Size Fractions of Different Land Use Open
Diffuse reflectance FTIR measurements with two-dimensional correlation spectroscopy (2D-COS) are used for accurate band identification of chernozem comprising soil organic matter (SOM), including humic substances and mineral silicate matri…
View article: Yedoma Permafrost Releases Organic Matter with Lesser Affinity for Cu2+ and Ni2+ as Compared to Peat from the Non-Permafrost Area: Risk of Rising Toxicity of Potentially Toxic Elements in the Arctic Ocean
Yedoma Permafrost Releases Organic Matter with Lesser Affinity for Cu2+ and Ni2+ as Compared to Peat from the Non-Permafrost Area: Risk of Rising Toxicity of Potentially Toxic Elements in the Arctic Ocean Open
Pollution of the Arctic Ocean by potentially toxic elements (PTEs) is a current environmental problem. Humic acids (HAs) play an important role in the regulation of PTE mobility in soil and water. The permafrost thaw releases ancient organ…
View article: Correction to: The effect of small silver inclusions on the palladium activity in formicacid oxidation reaction and corrosion stability
Correction to: The effect of small silver inclusions on the palladium activity in formicacid oxidation reaction and corrosion stability Open
View article: Quantification of Lignosulfonates and Humic Components in Mixtures by ATR FTIR Spectroscopy
Quantification of Lignosulfonates and Humic Components in Mixtures by ATR FTIR Spectroscopy Open
The existing techniques for lignosulfonate (LS) in humate fertilizers lack selectivity to humic substances (HS) as the main component; they involve labor- and time-consuming sample preparation to separate the components at the level of det…
View article: Simultaneous Quantification of Fullerenes C60 and C70 in Organic Solvents by Excitation–Emission Matrix Fluorescence Spectroscopy
Simultaneous Quantification of Fullerenes C60 and C70 in Organic Solvents by Excitation–Emission Matrix Fluorescence Spectroscopy Open
Excitation–emission matrix (EEM) fluorescence spectroscopy of unmodified (pristine) fullerenes C60 and C70 in benzene, toluene, and n-hexane at room temperature was used for their quantification by their solvent-dependent EEM bands specifi…
View article: Measurement Precision and Thermal and Absorption Properties of Nanostructures in Aqueous Solutions by Transient and Steady-State Thermal-Lens Spectrometry
Measurement Precision and Thermal and Absorption Properties of Nanostructures in Aqueous Solutions by Transient and Steady-State Thermal-Lens Spectrometry Open
A simultaneous steady-state and transient photothermal-lens modality was used for both the thermal and optical parameters of aqueous dispersed systems (carbon and silica nanoparticles, metal iodides, surfactants, heme proteins, albumin, an…
View article: New methods of predicting and prospecting/exploration of hydrocarbon deposits to improve exploration performance in the Timan-Pechora oil and gas province
New methods of predicting and prospecting/exploration of hydrocarbon deposits to improve exploration performance in the Timan-Pechora oil and gas province Open
The Timan-Pechora oil and gas province remains rather promising for the discovery of new hydrocarbon fields and deposits, including large ones. However, in recent years, the efficiency of oil and gas prospecting and exploration has been ra…
View article: FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving
FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving Open
Granulometric fractionation as a source of additional information on organic-matter and inorganic matrix components of soils using FTIR-photoacoustic spectroscopy (FTIR-PAS) supported by attenuated-total reflection FTIR spectroscopy (ATR-F…
View article: Technical Condition of the Main Gas Pipeline Bovanenkovo – Ukhta at the Underwater Crossing of the Baydaratskaya Bay
Technical Condition of the Main Gas Pipeline Bovanenkovo – Ukhta at the Underwater Crossing of the Baydaratskaya Bay Open
The actual issue of the operation of the main gas pipeline Bovanenkovo - Ukhta at the underwater crossing of the Baydaratskaya Bay is to clarify the parameters of its technical condition. In this paper, an analysisof the technical conditio…
View article: Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements
Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements Open
The methodology and results of thermal conductivity measurements by the heat-flow technique for the detonation nanodiamond suspension gels, sols, and powders of several brands in the range of nanoparticle concentrations of 2–100% w/w are d…
View article: Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy
Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy Open
Five sample-preparation techniques were compared to quantify 31 elements in coal humic substances (HS) by ICP–AES from the viewpoints of complete isolation and speciation of elements. They include, for bulk composition, preparation of an a…
View article: A Use of Tritium-Labeled Peat Fulvic Acids and Polyphenolic Derivatives for Designing Pharmacokinetic Experiments on Mice
A Use of Tritium-Labeled Peat Fulvic Acids and Polyphenolic Derivatives for Designing Pharmacokinetic Experiments on Mice Open
Natural products (e.g., polyphenols) have been used as biologically active compounds for centuries. Still, the mechanisms of biological activity of these multicomponent systems are poorly understood due to a lack of appropriate experimenta…
View article: Directed Synthesis of Humic and Fulvic Derivatives with Enhanced Antioxidant Properties
Directed Synthesis of Humic and Fulvic Derivatives with Enhanced Antioxidant Properties Open
Redox moieties, which are present in the molecular backbone of humic substances (HS), govern their antioxidant properties. We hypothesized that a directed modification of the humic backbone via incorporation of redox moieties with known re…
View article: Organic Matter and Mineral Composition of Silicate Soils: FTIR Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection Modalities
Organic Matter and Mineral Composition of Silicate Soils: FTIR Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection Modalities Open
This study aims to compare photoacoustic (FTIR–PAS), diffuse reflectance (DRIFT), and attenuated total reflection (ATR) FTIR modalities in the wide wavenumber range from NIR (7500 cm−1) to FIR (150 cm−1) for the same silicate soil samples …
View article: Temperature Dependences of IR Spectra of Humic Substances of Brown Coal
Temperature Dependences of IR Spectra of Humic Substances of Brown Coal Open
The capabilities of temperature-monitored IR spectroscopy for studying the organic matter and mineral composition of humic substances (HS) were tested. Temperature dependences of the mid-IR spectra of humic substances heated in the air in …
View article: Chestnut Soils: A Comparison Study by Diffuse Reflectance andAttenuated Total Reflection FTIR spectroscopies with Fractionation
Chestnut Soils: A Comparison Study by Diffuse Reflectance andAttenuated Total Reflection FTIR spectroscopies with Fractionation Open
For wet-sieving fractionated aggregates of chestnut soils (20-1000 μm) with different agricultural use (a fallow and arable land) and depth profiling, attenuated total reflection (ATR) and diffuse-reflectance (DRIFT) modalities of IR spect…
View article: Temperature Dependences of IR Spectral Band Frequencies of Soils
Temperature Dependences of IR Spectral Band Frequencies of Soils Open
Temperature dependences of the IR spectra of different size aggregate fractions of chernozem and soddy podzol soils in the range 25-215 °C (298-488 K with a step of 2.5 °C by heating in the air) for different agriculture use samples were i…
View article: Speciation of organosulfur compounds in carbonaceous chondrites
Speciation of organosulfur compounds in carbonaceous chondrites Open
View article: Green and rapid preparation of long-term stable aqueous dispersions of fullerenes and endohedral fullerenes: The pros and cons of an ultrasonic probe
Green and rapid preparation of long-term stable aqueous dispersions of fullerenes and endohedral fullerenes: The pros and cons of an ultrasonic probe Open
A green, scalable, and sustainable approach to prepare aqueous fullerene dispersions (AFD) C60, C70, endohedral metallofullerene Gd@C82, and their derivatives C60Cl6, C70Cl<…