Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 journals)            First | 1 2 3 4 | Last

Showing 401 - 600 of 735 Journals sorted alphabetically
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 5)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 6)
Journal of Nanoparticles     Open Access   (Followers: 4)
Journal of Nanostructure in Chemistry     Open Access   (Followers: 8)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 25)
Journal of Photochemistry and Photobiology     Open Access  
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Journal of Polymer & Composites     Full-text available via subscription   (Followers: 17)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 92)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access  
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 14)
Journal of Research and Education Chemistry     Open Access   (Followers: 1)
Journal of Research Updates in Polymer Science     Hybrid Journal   (Followers: 2)
Journal of Rubber Research     Hybrid Journal   (Followers: 1)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 13)
Journal of Solution Chemistry     Hybrid Journal   (Followers: 1)
Journal of Structural Chemistry     Hybrid Journal   (Followers: 1)
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 1)
Journal of Supercritical Fluids     Hybrid Journal   (Followers: 3)
Journal of Superhard Materials     Hybrid Journal  
Journal of Surface Science and Technology     Hybrid Journal  
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 3)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Hybrid Journal   (Followers: 322)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 2)
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Chinese Chemical Society     Hybrid Journal  
Journal of the Indian Chemical Society     Hybrid Journal  
Journal of The Indonesian Society of Integrated Chemistry     Open Access  
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal  
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of the Serbian Chemical Society     Open Access  
Journal of the Turkish Chemical Society, Section A : Chemistry     Open Access  
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 9)
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Kimia (Journal of Chemistry)     Open Access  
Jurnal Kimia Riset     Open Access  
Jurnal Pendidikan Kimia     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kinetics and Catalysis     Hybrid Journal   (Followers: 4)
Konfigurasi : Jurnal Pendidikan Kimia dan Terapan     Open Access  
Korea-Australia Rheology Journal     Hybrid Journal   (Followers: 1)
Langmuir     Hybrid Journal   (Followers: 58)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access  
Luminescence     Hybrid Journal   (Followers: 2)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 5)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 10)
Macromolecular Research     Hybrid Journal   (Followers: 2)
Macromolecular Symposia     Hybrid Journal   (Followers: 3)
Macromolecular Theory and Simulations     Hybrid Journal   (Followers: 2)
Macromolecules     Hybrid Journal   (Followers: 48)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 8)
Magnetochemistry     Open Access  
Marine Chemistry     Hybrid Journal   (Followers: 6)
Marine Drugs     Open Access   (Followers: 1)
MATEC Web of Conferences     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials and Devices     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 32)
Materials Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Materials Horizons     Hybrid Journal   (Followers: 6)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Science-Poland     Open Access   (Followers: 1)
Materials Sciences and Applications     Open Access   (Followers: 2)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 9)
Mediterranean Journal of Chemistry     Open Access  
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microchimica Acta     Hybrid Journal   (Followers: 2)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Chemistry & Applications     Open Access   (Followers: 1)
Modern Research in Catalysis     Open Access  
Molbank     Open Access  
Molecular Catalysis     Hybrid Journal   (Followers: 6)
Molecules     Open Access   (Followers: 4)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 4)
Mongolian Journal of Chemistry     Open Access  
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 1)
MRS Bulletin     Full-text available via subscription   (Followers: 4)
Nachrichten aus der Chemie     Hybrid Journal   (Followers: 18)
Nano Convergence     Open Access   (Followers: 1)
Nano Materials Science     Open Access   (Followers: 1)
Nano Reviews & Experiments     Open Access   (Followers: 14)
Nano Select     Open Access   (Followers: 1)
Nanochemistry Research     Open Access   (Followers: 1)
Nanoscale     Hybrid Journal   (Followers: 18)
Nanoscale Advances     Open Access  
Nanoscale Horizons     Hybrid Journal  
Nanoscale Research Letters     Open Access   (Followers: 8)
Nanoscience and Nanotechnology Letters     Full-text available via subscription   (Followers: 24)
Natural Product Communications     Open Access  
Natural Product Reports     Hybrid Journal   (Followers: 10)
Natural Science     Open Access   (Followers: 8)
Natural Volatiles & Essential Oils     Open Access  
Nature Chemistry     Full-text available via subscription   (Followers: 97)
Nature Protocols     Full-text available via subscription   (Followers: 72)
Nature Reviews Chemistry     Hybrid Journal   (Followers: 17)
New Journal of Chemistry     Hybrid Journal   (Followers: 17)
Nitric Oxide     Hybrid Journal  
Nitrogen     Open Access  
Nukleonika     Open Access  
Open Chemistry Journal     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Chemistry     Open Access  
Open Journal of Composite Materials     Open Access   (Followers: 22)
Open Journal of Inorganic Non-metallic Materials     Open Access   (Followers: 2)
Open Journal of Medicinal Chemistry     Open Access   (Followers: 4)
Open Journal of Polymer Chemistry     Open Access   (Followers: 12)
Open Journal of Synthesis Theory and Applications     Open Access  
Open Medicinal Chemistry Journal     Open Access  
Orbital - The Electronic Journal of Chemistry     Open Access   (Followers: 1)
Organic & Biomolecular Chemistry     Hybrid Journal   (Followers: 57)
Organometallics     Hybrid Journal   (Followers: 19)
Oxidation of Metals     Hybrid Journal   (Followers: 16)
Passer Journal of Basic and Applied Sciences     Open Access  
Peptide Science     Full-text available via subscription  
Pharmaceuticals     Open Access   (Followers: 4)
Pharmaceutics     Open Access   (Followers: 5)
Phosphorus, Sulfur, and Silicon and the Related Elements     Hybrid Journal   (Followers: 2)
Photochemistry and Photobiology     Hybrid Journal   (Followers: 3)
Physical Science International Journal     Open Access  
Physics and Materials Chemistry     Open Access   (Followers: 1)
Phytochemistry     Hybrid Journal   (Followers: 4)
Phytochemistry Letters     Full-text available via subscription   (Followers: 1)
Plasma     Open Access   (Followers: 3)
Plasma Chemistry and Plasma Processing     Hybrid Journal   (Followers: 3)
Polycyclic Aromatic Compounds     Hybrid Journal  
Polyhedron     Hybrid Journal   (Followers: 4)
Polymer Chemistry     Hybrid Journal   (Followers: 24)
Polymer crystallization     Hybrid Journal  
Polymer Degradation and Stability     Hybrid Journal   (Followers: 23)
Polymer Engineering & Science     Hybrid Journal   (Followers: 14)
Polymer Reviews     Hybrid Journal   (Followers: 32)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Polymer Testing     Hybrid Journal   (Followers: 192)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Polymers     Open Access   (Followers: 21)
Polymers from Renewable Resources     Hybrid Journal  
Proceedings of the Combustion Institute     Full-text available via subscription   (Followers: 8)
Processes     Open Access  
Progress in Lipid Research     Hybrid Journal   (Followers: 3)
Progress in Organic Coatings     Hybrid Journal   (Followers: 7)
Progress in Polymer Science     Full-text available via subscription   (Followers: 36)
Progress in Reaction Kinetics and Mechanism     Open Access  
Progress in Solid State Chemistry     Full-text available via subscription   (Followers: 3)
Progress in Surface Science     Full-text available via subscription   (Followers: 3)
Protein Science     Hybrid Journal   (Followers: 45)
Radiochemistry     Hybrid Journal   (Followers: 1)
Rapid Communications in Mass Spectrometry     Hybrid Journal   (Followers: 33)
Reaction Chemistry & Engineering     Hybrid Journal  
Reaction Kinetics, Mechanisms and Catalysis     Hybrid Journal   (Followers: 3)
Reactions     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Research Journal of Phytochemistry     Open Access   (Followers: 1)
Resources Chemicals and Materials     Full-text available via subscription   (Followers: 2)
Results in Chemistry     Open Access  
Results in Geochemistry     Open Access  
Results in Surfaces and Interfaces     Open Access  
Review Journal of Chemistry     Hybrid Journal   (Followers: 1)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista Boliviana de Química     Open Access  
Revista CENIC. Ciencias Quimicas     Open Access  
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access  
Revista Colombiana de Química     Open Access  
Revista Cubana de Química     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciencias     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Sociedad Química del Perú     Open Access  
Revista de la Societat Catalana de Química     Open Access  
Revista de Química     Open Access   (Followers: 3)
Revista Debates em Ensino de Química     Open Access  
Revista ION     Open Access  
RSC Advances     Open Access   (Followers: 27)
RSC Chemical Biology     Open Access  
RSC Medicinal Chemistry     Hybrid Journal   (Followers: 6)
Russian Journal of Bioorganic Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Coordination Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of General Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Science China Chemistry     Hybrid Journal   (Followers: 2)
Science Talks     Full-text available via subscription   (Followers: 2)
Sciences & Technologie A : sciences exactes     Open Access  
Scientific Journal of Frontier Chemical Development     Open Access   (Followers: 2)

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Similar Journals
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Moscow University Chemistry Bulletin
Journal Prestige (SJR): 0.188
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1935-0260 - ISSN (Online) 0027-1314
Published by Springer-Verlag Homepage  [2469 journals]
  • Identification and Quantitation of Triterpene Saponins in Infructescences
           and Leaves of Different Alder Species

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      Abstract: The presence of triterpene saponins in infructescences and leaves of gray (Alnus incana (L.) Moech) and black (Alnus glutinosa (L.) Gaerth) alder is revealed by qualitative analysis. Oleanolic acid (OA) is detected in all the studied plant materials by thin-layer chromatography. Using direct spectrophotometry (detection wavelength, 310 nm), the total triterpene saponins are determined in infructescences (1.538–1.682%, as OA) and leaves (1.102–1.274%, as OA).
      PubDate: 2022-02-01
       
  • Nonlinear Effects Observed During Erythrocyte Sedimentation in Blood
           Diluted by Its Own Plasma. Blood as Active Colloid System

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      Abstract: The dynamics of sedimentation of blood erythrocytes was studied during its sequential dilution with its own plasma in vitro. It was shown that with an increase in the degree of dilution of whole blood over 5%, a monotonous increase in the average erythrocyte sedimentation rate is observed. Dynamic changes in the density of the plasma-red cells border were found, which are manifested in the oscillatory nature of changes in the rate of the process and the phenomena of “negative sedimentation rate.” They are associated with structural reorganization of the system and phase separation “associated plasma/erythrocytes,” and can be modulated by the relative content of plasma in the blood, exhibiting a non-monotonic nature of the changes. The results obtained can be useful for further development of a model of behavior of blood cells as an active colloid, as well as for the creation of a method for monitoring the individual dosage of infusion solutions used in clinical practice for blood loss, for detoxification, treatment and prevention of thrombophlebitis and shock conditions.
      PubDate: 2022-02-01
       
  • Molecular Basis of Intellect: Proton Mechanism of Recording Information

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      Abstract: The concept of the molecular foundations of neurological memory is formulated based on the physicochemical principles of the functioning of biomolecules. The concept proceeds from the position that a neuroimage is formed in the form of a matrix of conducting acetylcholine synaptic contacts, while the key is the reversible inactivation of acetylcholinesterase by hydrogen ions, the products of acetylcholine hydrolysis. Fundamentally important and new is the idea that storing information in the form of a neuroimage is related to the pH-blockade of acetylcholinesterase activity in the synaptic cleft, which makes it possible for each synapse that forms a neuroimage to continuously participate in signal transmission. The mechanisms of the functioning of the elementary neural network, which provide the recording–reading of information, are considered, and the performance of the system is assessed.
      PubDate: 2022-02-01
       
  • Spectral and Structural Properties of Luminescent Carbon Nanoparticles
           Obtained by Electrolysis of an Alcoholic NaOH Solution

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      Abstract: We obtain carbon nanoparticles by the electrolysis of sodium hydroxide solution in 94% ethanol on platinum electrodes. Centrifugation, column chromatography, and dialysis are used to isolate and purify nanoparticles from synthesis by-products. The nanoparticles have a hydrodynamic diameter of approximately 14 nm, and their surface potential is –20 mV. The particles are soluble in water due to the hydroxyl and carboxyl groups on their surface and exhibit luminescence in the blue and orange regions of the visible spectrum. The paper discusses the details of the electrochemical synthesis of nanoparticles of this type.
      PubDate: 2022-02-01
       
  • Ligands Bearing Picolinate Groups as Potential Chelators for Application
           in Nuclear Medicine

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      Abstract: Some metal radionuclides can be used in diagnostic methods for imaging, such as single-photon emission computed tomography (99mTc, 111In) and positron emission tomography (PET) (44Sc, 64Cu, 68Ga), as well as for therapeutic applications (47Sc, 90Y, 177Lu, 212Pb, 212/213Bi, 225Ac). A chelator, e.g., a ligand that binds a radiometal ion into a strong stable coordination complex, is an important component of a radiopharmaceutical (RP) based on radio metals. In the past decade, as part of the search for new highly effective chelating molecules, the number of studies related to the production of picolinate ligands and the characterization of their complexes with diagnostic and therapeutic radionuclides has sharply increased. Moreover, conjugates with biomolecules based on these chelators have already been synthesized and studied. In this review, data on the binding of cations of radionuclides by picolinate-containing ligands of various types, as well as their conjugates, are systematized and analyzed.
      PubDate: 2022-02-01
       
  • Kinetics of the Interaction of Colistin with Live Escherichia coli Cells
           by the Bioluminescence Method

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      Abstract: We obtain the kinetic dependences of the concentration of adenosine-5'-triphosphate (ATP) inside (ATPin) and outside (ATPex) E. coli cells on the colistin concentration and incubation in a nutrient LB medium and saline using the optimized bioluminescence method. With an increase in the concentration of colistin and the duration of incubation of cells in a nutrient medium, the ATPin value rapidly decreases to zero. In this case, the ATPex value increases, reaching the limit (20–30% of the initial ATPin value), and does not change even after the complete cell death. The significant decrease in ATPin can be explained by the decrease in the activity of the enzymes of the respiratory chain and ATP synthase, functioning in the inner membrane of the cell, damage to which during incubation with colistin leads to a decrease in the rate and even to a cessation of ATP synthesis. A comparison of ATPin and ATPex during the incubation of cells in a nutrient medium and saline in the presence of colistin show that colistin has a more substantial bactericidal effect on growing, metabolically active cells. In contrast, nongrowing cells deprived of nutrition are more resistant to antibiotic action.
      PubDate: 2022-02-01
       
  • Erratum to: Experimental Verification on the Hypothesis about the
           Possibility of Molecular Diagnostics of Local Tumor Spread on the Lewis
           Lung Carcinoma Model

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      Abstract: An Erratum to this paper has been published: https://doi.org/10.3103/S0027131421060109
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060109
       
  • Spectrophotometric Determination of the Total Anthocyanin Content of
           Euterpe oleracea Fruits

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      Abstract: A method for the spectrophotometric determination of the total anthocyanin content of Euterpe oleracea is developed. The analytical absorption peaks due to anthocyanins are determined (625 ± 2 nm). The following optimal conditions for extraction of anthocyanins from the plant under study are substantiated experimentally: 40% ethanol as the extracting agent, the ratio of the plant material to the extracting agent is 1 : 100, the extraction duration is 60 min, and the fineness of plant material is at most 1.0 mm.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060043
       
  • DFT Modeling of Chemical Interactions of the Ethylene Molecule with
           Nitrogen Oxides

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      Abstract: The quantum chemistry calculations of the systems “ethylene – nitrogen oxides (NOx)” were conducted using electron density functional method B3LYP/6-31G** with correlation-consistent cc-pVTZ basis set and pure non-empirical second-order Moeller–Plesset (MP2) perturbation theory approach with the same basis set in order to estimate the possibilities of the chemical interactions between the components in gas phase and low temperature co-condensates and to reveal the dominating features. Among nitrogen oxides (NOx) we have considered the following molecules NO, NO2 and N2O4, and all the calculations were made for 1 : 1 systems. The both approaches exhibit quite satisfactory agreement with each other for the C2H4–NO system The sets of stationary points (minimum, saddle point) and the relative values of their energies due to the reaction coordinate were obtained. For each of the offered reaction mechanisms full reaction path were suggested and so the found stationary points are connected by reaction coordinate according to IRC procedure and the energetic profiles have been constructed. It was shown that chemical interactions are the mostly likely for “C2H4–NO2” system, where two first potential barriers were relatively low and were equal to 12.7 and 16.3 kcal/mol. This fact is exceptionally important for the reactions in low temperature condensates of the components.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060134
       
  • Evaluation of the Mineral Status in Patients with Food Hypersensitivity
           and Metabolic Disorders

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      Abstract: The paper considers the role of mineral elements in patients with food hypersensitivity with an assessment of their contribution to the development of metabolic disorders. The study performed a comparative analysis of the concentration of 29 macro- and microelements with a simultaneous assessment of the immunological and biochemical parameters in patients with an increased body mass index in comparison with volunteers with a normal body mass index. We established relationships between the serum lipid profile and lead (Pb) concentration in hair samples: Pb and cholesterol (Rs = 0.38; p < 0.05), Pb and LDL (Rs = 0.33; p < 0.05), and Pb and the atherogenicity index (Rs = 0.34, p < 0.05). We found an inverse correlation between the serum IL-6 concentrations and zinc in the hair samples (Rs = –0.45, p < 0.05), as well as a correlation between milk hypersensitivity and the calcium (Ca) concentration in hair samples: Ca and IgG to casein (Rs = –0.54; p < 0.05), Ca and IgG to cow’s milk (Rs = –0.36; p < 0.05), and Ca and IgG to cottage cheese (Rs = –0.52; p < 0.05). The results of this study show the role of macro- and microelements as significant predictors in the development of metabolic disorders.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060067
       
  • Vibrational Structure of a High-Resolution UV Absorption Spectrum of
           2-Fluoroacryloyl Fluoride in the Gas Phase

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      Abstract: The resolved vibrational structure of the UV absorption spectrum of a molecule in the gas phase is obtained for the first time. The 0–0 bands of the isomers are found. The fundamental vibrational frequencies and the (0–v) transitions of torsional vibration are found for the s-trans and s-cis isomers of the molecule in the ground (S0) and excited (S1) electronic states. The resulting 148 absorption bands are assigned completely.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060031
       
  • Role of the Protein Environment in Photoisomerization of Type I and Type
           II Rhodopsins: a Theoretical Perspective

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      Abstract: Primary photoisomerization reactions of the retinal protonated Schiff base (RPSB) inside type I and type II rhodopsins are ultrafast and exhibit high quantum yields. Specific protein environments are thought to facilitate photoisomerization of RPSB; however, the detailed mechanisms of tuning the reaction timescales and specificity are far from being understood. Here, by using molecular dynamics simulations and large-scale XMCQDPT2-based QM/MM modeling, we gain insight into the role played by the protein environment in specific photoisomerization of RPSB from all-trans to 13-cis in microbial rhodopsin KR2 and from 11-cis to all-trans in bovine visual rhodopsin. By analyzing the calculated vibronic band shapes, we explore the early-time excited-state dynamics of RPSB in both types of rhodopsins. We show that the protein environment changes vibrational modes, which become excited following the S0–S1 transition, by pre-twisting the chromophore about a certain double bond in the ground electronic state. This reduces a barrier that hinders intramolecular rotation in the excited state, thus facilitating photoisomerization across the specific double bond. Moreover, pre-twisting of RPSB also provides conditions for initial in-phase excitation of the fundamental vibrational modes involved in the reaction coordinate, enabling vibrationally coherent barrierless excited-state decay in the photochemistry of vision.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060110
       
  • Methods of Measuring the Depth of Nanoholes in Metallic Aluminum in the
           Process of High-Voltage Anodizing

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      Abstract: Two alternative approaches to measuring the depth of nanoholes (nanopits) formed in metallic aluminum in the process of its high-voltage anodizing are proposed. The first approach consists of the electron microscopic study of a metallic layer section formed by cutting ions with the use of a sputtered protective platinum layer with immediate observation of an array of nanopits. The second (indirect) method consists of manufacturing copper replicas from a metallic aluminum layer with the further electrochemical measurement of the overall surface area of the copper electrode and the calculation of the height of the copper nanobristles. It is shown that both approaches lead to the same results.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060080
       
  • Speciation of Uranium in Bottom Sediments of Reservoir V-17, Mayak
           Production Association

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      Abstract: This paper examines the speciation of  234, 238U in the bottom sediments of Reservoir V-17, of the Mayak Production Association. The sequential leaching procedure shows that uranium isotopes are present in all the extracted fractions. The maximum uranium content is registered in the carbonate-bound fraction (29–33%). In the conditions of Reservoir V-17, uranium can be washed out of the bottom sediments by the surface waters. It can be assumed that the main radionuclide migration mechanism involves the ion transport of carbonate complexes.
      PubDate: 2021-11-01
      DOI: 10.3103/S002713142106002X
       
  • Simultaneous Adsorption of Toxic Dyes onto the Magnetite Decorated
           Multi-Walled Carbon Nanotubes: Statistical Optimization, Kinetics and
           Isotherms

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      Abstract: In the work, the magnetite decorated multi-walled carbon nanotubes (Fe3O4/MWCNTs) were employed to simultaneously adsorb methylene blue (MB) and methyl orange (MO) dyes from aqueous media. The experiments were conducted based on a Box-Behnken design (BBD) with the variables of Fe3O4/MWCNTs dosage (0.8–2.0 g), pH (3–9), contact time (30–50 min) and ionic strength (0.02–0.10 mol L–1) using fixed concentrations of the dyes (10 mg L–1). The measured process efficiencies were fitted to the second-order response surface models (R2 > 0.97) by which the optimum conditions for simultaneous adsorption of the dyes was predicted as: 2.0 g L–1 of nanoadsorbent, contact time of 48.5 min, pH 5 and ionic strength of 0.02 mol L–1. The experiments conducted at the conditions resulted in the removal percentages of 98.90 ± 0.29 for MB and 96.64 ± 0.22 for MO. Analysis of variance showed that the nanoadsorbent dosage was the most important factor affecting the removal process. The dye-nanoadsorbent systems followed the pseudo-second order kinetic model (R2 > 0.99). Moreover, Langmuir and Temkin isotherms were found to be the best models to describe MB and MO adsorption onto Fe3O4/MWCNT nanoadsorbent, respectively.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060122
       
  • Photochemistry of 2,2-Dimethyl- and 2,2,3-Trimethyloxirane Radical Cations
           in Freon Matrices at 77 K

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      Abstract: The nature of radical cations (RCs) stabilized in irradiated frozen solutions of 2,2-dimethyl- and 2,2,3-trimethyloxirane in Freons (CFCl3, CF3CCl3) was determined by means of EPR and UV/Vis spectroscopy as well as quantum chemistry. It was established that the afforded ring-open RCs, formed upon C–C bond cleavage in the oxirane ring, undergo intramolecular hydrogen atom transfer upon the action of light, resulting in the formation of distonic RCs.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060092
       
  • The Role of a Complex Formation in the Dissolution of Iron Oxides in
           Orthophosphoric Acid

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      Abstract: The effect of the nature of acids on the kinetic regularities of the dissolution of iron (hydr) oxide phases in acidic solutions is studied. The nature of the potential-determining reaction in the magnetite electrode/orthophosphoric acid solutions system is revealed. It is shown based on the experimental data that the dissolution of iron oxide phases can be stimulated varying the iron oxide/electrolyte solution phase-boundary potential.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060055
       
  • Amplification-Free Identification and Determination of Nucleic Acids by
           Surface Plasmon Resonance and Surface-Enhanced Raman Spectroscopy

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      Abstract: This review discusses contemporary approaches to designing sensory systems for the identification and determination of nucleic acids (NAs) without amplifying target molecules. Here we summarize the data about methods based on surface plasmon resonance and surface-enhanced Raman spectroscopy, as well as their possibilities, limitations, and prospects for further development.
      PubDate: 2021-11-01
      DOI: 10.3103/S0027131421060079
       
  • Electrochemical Biosensor Based on Nanosized Polymer-Enzyme Films Composed
           of Linear Poly(N,N-Dimethylaminoethyl Methacrylate) and Choline Oxidase

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      Abstract: Nanosized polymer-enzyme films were fabricated on graphite surfaces via a sequential two-stage adsorption of the pH- and thermoresponsive polymer, viz., linear poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA), and the enzyme, viz., choline oxidase (ChO). The influence of the conditions (pH and temperature), which are applied for deposition of the polymer onto graphite surface, on electrochemical responses of the polymer-enzyme sensor constructs and kinetic parameters of enzymatic oxidation of choline by ChO integrated into the polymer-enzyme films was revealed. Stimuli-sensitivity of PDMAEMA was found to control the properties of the formed polymer coatings (surface coverage, film thickness and roughness), which decisively determine the amount of the ChO bound by the polymer film and, consequently, the resultant electrochemical characteristics of the polymer-enzyme sensor constructs.
      PubDate: 2021-09-01
      DOI: 10.3103/S0027131421050060
       
  • Critical Molecular Coordination Numbers in the Structural Class P21/c, Z =
           4(1)

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      Abstract: The network of intermolecular contacts in an organic crystal contains a finite set of strong contacts sufficient to form a network. These contacts form a subnetwork called the critical one. The critical networks of 4249 homomolecular monosystemic crystal structures of compounds CxHyOz in the most widespread structural class among supergiants P21/c, Z = 4(1) are investigated. The coordination numbers and the topology of the critical networks are analyzed and the prevailing topological types (dia, bnn, pcu, sqp, etc.) are identified. It is found that in 92% of cases the critical net displays parsimony having n + Δ (Δ = 0–2) symmetrically independent contacts, where n is the minimal allowable number.
      PubDate: 2021-09-01
      DOI: 10.3103/S0027131421050023
       
 
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