Bulgarian Chemical Communications, Volume 53, Number 4, 2021
Contents:
1
On the occasion of the 85th anniversary of Prof. Christo Boyadjiev
ANNIVERSARY
Pages 395 – 396
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2
To the memory of Prof. DSc Boryan Radoev (1941 – 2021)
IN MEMORIAM
Pages 397 – 398
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3
A new analytical formula for calculating the energy gap value using the transmittance curve
Original Research Article
Pages 399 – 404
H. Slimani, N. Bessous
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4
Comparison of antioxidant activity and determination of epigallocatechin gallate and trace elements of green tea samples manufactured and exported by Turkey
Original Research Article
Pages 405 – 411
L. Paşayeva, D. Yuvalı, E. Köngül Şafak, G. Şeker Karatoprak, İ. Narin
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5 Intensification of CO2 absorption using nanofluids in a structured packed columnon
Original Research Article
Pages 412 – 417)
P. P. Selvi, R. Baskar
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6 Modelling and multicriteria analysis for selection of growth rate models for batch cultivation of Kluyveromyces marxianus var. lactis MC 5 yeast.
Part I: Modelling with different types of growth rate models

Original Research Article
Pages 418 – 423
M. M. Petrov
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7 Study of wear intensity of solid nanocoatings deposited on steel 1.2080 (X12)
Original Research Article
Pages 424 – 428
V. Rupetsov, Iv. Uzunov, A. Mishev, Iv. Panov, E. Velev
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8 Experimental investigation of thermal & electrical performance of PV module using wick biomaterials
Original Research Article
Pages 429 – 435
V. K. Sohpal, S. Kumar
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9 Modelling and multicriteria analysis for selection of growth rate models for batch cultivation of Kluyveromyces marxianus var. lactis MC 5 yeast.
Part II: Multi-criteria decision analysis for selecting of growth rate model

Original Research Article
Pages 436 – 441
M.M. Petrov
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10 Parameter optimization of a semi-batch water decontamination slurry photocatalytic reactor using Taguchi-Grey technique
Original Research Article
Pages 442 – 446
 G. Munteanu , P. Karakashkova, A. Eliyas
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11 Influence of the binder on the mechanical stability and electrochemical properties of Zn electrode for rechargeable zinc-air batteries
Original Research Article
Pages 447 – 450
B. Abrashev, D. Uzun, V. Terziev, G. Raikova, K. Petrov
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12 Selected papers from 7th International Conference on New Trends in Chemistry, September 25-26, 2021, Online https://icntcconference.com/
Selected Papers
Pages 451 – 452
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13 Investigation of photocatalytic degradation of methylene blue by titanium dioxide composites
Original Research Article
Pages 453 – 455
E. Akyol, G. Tonbul
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14 Theoretical and experimental photodegradation of Phosmet via oxidation techniques in the presence of aqueous TiO2 suspension
Original Research Article
Pages 456 – 463
B. Eren, Y. Y. Gurkan
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15 Surface modification of zeolite and kaolin with 3-(aminopropyl) triethoxysilane and 3-(trimethoxysilyl) propyl methacrylate
Original Research Article
Pages 464 – 470
C. Özel, C. Akat, R. Alosmanov, M. U. Kahveci, C. Emir, S. Yücel
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16 Investigation of stability and activity of poly (ethylene-alt-maleic anhydride) copolymer at different pHs and in simulated body fluids
Original Research Article
Pages 471 – 474
D.Ş. Daşdan
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17 Thermal analysis and isoconversional kinetic study of thermal decomposition of polycyclohexene oxide polystyrene (PCHO-PST) comb-shaped polymer
Original Research Article
Pages 475 – 479
H. Dolas, N. Genli
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18 Preliminary investigation into the synthesis and characterisation of single nucleotide polymorphs of human glutathione-S-transferase class PI
Original Research Article
Pages 480 – 485
S. Mathura
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19 Ceramics based on powder mixtures of β-tricalcium phosphate and potassium hydrogen sulfate prepared under mechanical activation in acetone medium
Original Research Article
Pages 486 – 495
T. V. Safronova, M. M. Akhmedov, T. B. Shatalova, S. A. Tikhonova, G. K. Kazakova, M. R. Kaimonov, A. V. Knotko
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20 AUTHOR INDEX
Pages 496 – 499
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21 SUBJECT INDEX
Pages 500 – 502
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22 Instructions about Preparation of Manuscripts
Pages 503 – 504
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23 CONTENTS
Page 505
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