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Journal articles on the topic 'РН value'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

АГЕЕВА, Н. М., А. А. ШИРШОВА, Л. Э. ЧЕМИСОВА, and А. В. МАЦКУЛ. "CHANGES IN THE CONCENTRATION OF BIOGENIC AMINES IN WINES DEPENDING ON THE PH VALUE." Известия вузов. Пищевая технология, no. 1(391) (May 17, 2023): 37–42. http://dx.doi.org/10.26297/0579-3009.2023.1.4.

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Массовая концентрация биогенных аминов – важный показатель качества и безопасности пищевой про- дукции, в том числе и алкогольной, концентрация которых нормируется в большинстве европейских стран. На нако- пление биогенных аминов в винах влияет множество факторов, среди которых наиболее важным является величина рН, так как от ее значения зависит ферментативная активность микроорганизмов, в том числе активность декарбок- силаз, в процессе приготовления виноматериалов, их выдержки и хранения. Было изучено изменение концентрации биогенных аминов в винах наливом (виноматериалах) из винограда сорто

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2

Гержикова, Виктория Григорьевна, Надежда Станиславовна Аникина, Антонина Валерьевна Весютова, Марианна Вадимовна Ермихина, Ольга Викторовна Рябинина, and Ольга Алексеевна Чурсина. "Study of the relationships between the builders of crystal formation in table wines." Magarach Vinogradstvo i Vinodelie, no. 3(113) (September 21, 2020): 272–76. http://dx.doi.org/10.35547/im.2020.22.3.017.

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Изучались процессы формирования тартратных солей калия и кальция в винах в зависимости от различных соотношений компонентов и рН. В работе использовано 212 образцов белых столовых сухих вин, выработанных на предприятиях Крыма. В образцах определяли значения рН, массовую концентрацию винной кислоты и ее форм, катионов калия и кальция, температуру насыщения вин битартратом калия (Тнас KHTar) и тартратом кальция (Тнас СаТ). По экспериментальным данным рассчитывали соотношения: винной кислоты к рН, битартратной формы к катиону калия (HT/К), тартратной формы к катиону кальция (T/Са), а также двух п

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3

Belevich, V. K., and V. V. Sentchouk. "Biochemical characteristics of iodperoxidase activity of human saliva." Biomeditsinskaya Khimiya 57, no. 2 (2011): 187–94. http://dx.doi.org/10.18097/pbmc20115702187.

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Peroxidase-catalyzed oxidation of iodide in human saliva leads to the formation of a brown product with λmax 287 nm and 353 nm (I3-) identified by the method of UV-spectrophotometry. I3- directly reacts with starch producing the characteristic blue complex. Salivary iodide peroxidase activity was found to be from 1.2 to 2.3 times higher then the activity of salivary peroxidases with natural substrates (SCN- and Cl-). Optimum for the iodide peroxidase activity in human saliva was found to be near рН 5.8. Salivary iodide peroxidase activity progressively lowers with the rise of рН value of the r

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4

Кожухова, Наталья, Natal'ya Kozhuhova, Дмитрий Данакин, et al. "pH-VALUE OF REACTION MEDIUM AS A FACTOR OF FOAM STRUCTURE FORMATION." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 3, no. 8 (2018): 101–8. http://dx.doi.org/10.12737/article_5b6d586ca043d4.17885788.

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5

А.А., Kaloshina, and Tcelykh E.D. "PROGNOSTIC VALUE OF EXPRESS ANALYSIS OF DRINKING WATER IN RELATION TO THE INCIDENCE OF COVID-19 IN BOYS AND GIRLS AGED 21-22 YEARS." Natural resources of the Earth and environmental protection 3, no. 1 (2022): 52–58. http://dx.doi.org/10.26787/nydha-2713-203x-2022-3-1-52-58.

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Annotation: To date, the problem of drinking water quality and its impact on human health has been widely covered. Thus, in 2020-2021, 600 samples were examined in 5 districts of Khabarovsk by conducting an express analysis of drinking water of centralized water supply for qualitative and semi-quantitative determination of рН, NO2─, NO3─, Cl─, GH as factors in the formation of COVID-19 morbidity in boys and girls aged 21-22. Such indicators as рН, NO2─, NO3─ and GH correspond to the standard in all districts and all seasons of 2020-2021. The characteristics of Cl─ in drinking water deviate fro

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6

Леонович, С. Н., Е. Е. Шалый, Д. А. Литвиновский, А. В. Степанова, А. В. Журавская та В. В. Малюк. "СОДЕРЖАНИЕ ХЛОРИДОВ И ЗНАЧЕНИЕ рН В ПОРОВОМ РАСТВОРЕ БЕТОНА ПРИ КАРБОНИЗАЦИИ: АНАЛИЗ ЭКСПЕРИМЕНТАЛЬНЫХ ИССЛЕДОВАНИЙ". Vestnik of Brest State Technical University. Civil Engineering and Architecture, № 2 (128) (15 липня 2022): 20–25. http://dx.doi.org/10.36773/1818-1112-2022-128-2-20-25.

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7

Radayev, Sergey, Olga Seleznyova, Konstantin Ilyukhin, Konstantin Ivanov, and Natalia Forosevich. "The Problem of Structurization of Liquid Glass." Materials Science Forum 871 (September 2016): 90–95. http://dx.doi.org/10.4028/www.scientific.net/msf.871.90.

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The article presents research data of the sodium silicate suspension, received by opal raw materials hydrothermal leaching.Results of the X-ray powder diffraction of natural and thermally processed diatomite are presented. Dependence of sodium silicate properties on рН value is considered. The complex technology of opal raw materials processing at a wet process of sodium silicate production is offered.

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8

Trenin, Dmitriy S., Andrey V. Kul’minskiy, Ivan D. Trenin, and Mikhail A. Kul’minskiy. "Endoscopic Carbon Dioxide Insufflation into the Pancreatic Duct: is it Possible to Manage the Acute Pancreatitis by Decreasing Local pH to Suppress Enzymatic Self-Digestion?...161." Journal of Ural Medical Academic Science 18, no. 2 (2021): 161–85. http://dx.doi.org/10.22138/2500-0918-2021-18-2-161-185.

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Background: the main clinical symptoms of the acute pancreatitis (AP) used to be explained by a local and a systemic action of activated pancreatic enzymes. Methods. To evaluate a conceptual possibility of the management of AP, the self-digestive enzyme suppression by the local рН lowering via the endoscopic carbon dioxide insufflation into the pancreatic duct has been simulated numerically. For the main patterns of a duct system structure, the СО2 diffusion, рН distributions, kinetic constants of trypsin and lipase have been calculated. Results. The СО2 diffusion zone volume-averaged рН has b

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Spiridonova, N. V., M. A. Kaganova, O. O. Devyatova та A. A. Bezrukova. "Cervical Canal Microbiota Features in Second Trimester of Pregnancy in Insuficiencia Istmicocervical with Clinical Signs of Vulvovaginitis Depending on Vaginal Discharge рH". Doctor.Ru 20, № 6 (2021): 12–19. http://dx.doi.org/10.31550/1727-2378-2021-20-6-12-19.

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Study Objective: To study the microbiological composition of cervical canal in insuficiencia istmicocervical (IIC) in patients with vulvovaginitis depending on vaginal discharge рH. Study Design: perspective study. Materials and Methods. The study included 67 patients of reproductive age with clinical signs of vulvovaginitis and IIC. Where vaginal discharge рН was > 4.5, patients were prescribed empirical Metrogil Plus; these women comprised the study group (n = 40). Where vaginal discharge рН was ≤ 4.5, patients were prescribed empirical Tergynan; these women were controls (n = 27). Baseli

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10

МУРАШОВА, Е. А., О. А. ФЕДОСОВА, and О. В. СЕРЕБРЯКОВА. "THE IMPACT OF TECHNOLOGICAL FACTORS OF HONEY ON ITS ADDITIONAL QUALITATIVE INDICATORS." VESTNIK RIAZANSKOGO GOSUDARSTVENNOGO AGROTEHNOLOGICHESKOGO UNIVERSITETA IM P A KOSTYCHEVA, no. 2(50) (June 30, 2021): 42–50. http://dx.doi.org/10.36508/rsatu.2021.50.2.006.

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Проблема и цель. Целью работы стало исследование воздействия технологических факторов меда на показатель (рН) и электропроводность. Методология. Исследования проводили в испытательной лаборатории ФГБНУ «ФНЦ пчеловодства». Для определения рН и электропроводности у медов разного ботанического происхождения заготавливали пробы и исследовали их. Для проведения сравнительного анализа исследуемых показателей у натурального и фальсифицированных проб меда использовали образцы фальсификатов, которые были получены при скармливании пчелам сахарного сиропа, инвертного сиропа, крахмальной патоки, свеклович

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11

Polonsky, A. B., and E. A. Grebneva. "ABOUT LONG-PERIOD VARIABILITY OF VALUE pH IN THE DEEP-SEA PART OF THE BLACK SEA." Monitoring systems of environment 1 (March 18, 2019): 63–71. http://dx.doi.org/10.33075/2220-5861-2019-1-63-71.

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12

Rusakova, S. M., I. G. Gorichev, I. V. Artamonova, E. O. Zabenkina, and U. S. Ageeva. "Study of TiO2 properties for commercial production." Izvestiya MGTU MAMI 4, no. 2 (2010): 179–84. http://dx.doi.org/10.17816/2074-0530-69731.

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The paper presents a research of dependence of adsorption of different ions on a titanium dioxide surface on the pH medium. Equations describing the dependence are presented. It is offered to describe the dependence by means of the acid-base equilibrium that arises on border of TiO2 electrolytic solution phases. It is found that the value of ion adsorption depends on pH. Optimum рН values which were obtained in the course of experiments are presented.

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13

Нургабыл, Н. К., та К. К. Мамырбаева. "ИССЛЕДОВАНИЕ СОРБЦИИ ЗОЛОТА АКТИВИРОВАННЫМ УГЛЕМ В ПРИСУТСТВИИ МЕТАЛЛОВ ПРИМЕСЕЙ". Горный журнал Казахстана, № 1(237) (31 січня 2025): 51–58. https://doi.org/10.48498/minmag.2025.237.1.003.

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Целью настоящей работы является исследование сорбционных свойств сорбентов, полученных на основе активированного угля (NoritRO, АКВАСОРБ) и шунгита. Эксперименты по определению оптимального сорбента проводились с цианистым раствором состава, мг/л: Au – 11,66; Ag – 2,16; Fe – 0,68; Cu – 8,45, Zn – 8,12. Установлено, что при сорбции золота с использованием сорбентов NoritRO, АКВАСОРБ и сорбента на основе шунгита, наибольшим значением емкости обладает ионит марки NoritRO. Оптимальным значением рН среды для извлечения золота с NoritRO и АКВАСОРБ явился 10, для сорбента на основе шунгита рН = 6. Пр

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14

Irzhigitova, D. M., M. A. Moshkova, E. A. Petrova, and E. S. Korchikov. "BARK OF TREES AND BUSHES AS THE SUBSTRATUM FOR EPIPHYTIC LICHENS IN THE STEPPE ZONE (ON THE EXAMPLE OF THE SAMARA REGION)." Vestnik of Samara University. Natural Science Series 19, no. 9.1 (2017): 151–57. http://dx.doi.org/10.18287/2541-7525-2013-19-9.1-151-157.

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In this article difference in chemical characteristics of bark of trees and bushes is viewed. Bark of bushes contains at least in 10 larger quantity of available forms of nitrogen, than bark of trees, it has the increased value of рН, it is more than 10 times richer with phenolic substances. The less there are available forms of nitrogen and water-soluble carboniferous matters in bark, the more specific to this substratum of types of lichens there are.

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15

Ksenofontov, B. S., A. S. Kozodayev, R. A. Taranov, M. S. Vinogradov, and E. V. Senik. "Floatation Sewage Treatment of Galvanic Productions." Ecology and Industry of Russia 22, no. 11 (2018): 10–13. http://dx.doi.org/10.18412/1816-0395-2018-11-10-13.

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In work processes of sewage treatment of galvanic productions with use of mainly floatation technologies are considered. For check of the developed technology solutions pilot studies of several versions of technological schemes have been conducted. The offered way includes twolevel reagent processing with the subsequent upholding and flotation. Tertiary treatment of sewage is consistently carried out in the filter with a sorbent the AC, and then in the filter with coal loading. The Zakyuchitelny stage of processing of sewage is adjustment рН to neutral value.

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16

Вильсон, Е. В. "Specific features of chemical phosphorus removal in the process of biological wastewater treatment." Vodosnabzhenie i sanitarnaia tehnika, no. 8 (August 15, 2022): 43–49. http://dx.doi.org/10.35776/vst.2022.08.06.

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Очистка сточных вод централизованных систем водоотведения поселений и городских округов относится к области применения наилучших доступных технологий. Для малых, небольших и средних сооружений содержание фосфора фосфатов в очищенной сточной воде не регламентируется, для сооружений производительностью свыше 10 тыс. м3/сут – не должно превышать 0,7 мг/дм3, при этом рекомендована биологическая и реагентная очистка от фосфора. Рассмотрены вопросы реагентного удаления фосфатов и определения влияния дозы алюмосодержащих реагентов и значения рН на бактериальное сообщество активного ила по его идентиф

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17

Ershov, Boris G., and Bladimir P. Shilov. "Reactions of ozone and intermediate products of its decomposition with actinides, lanthanides and transition metals in aqueous solutions." Radiochimica Acta 109, no. 8 (2021): 583–601. http://dx.doi.org/10.1515/ract-2021-1007.

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Abstract The properties and stability of ozone in aqueous solutions of various compositions in the рН range of 0–14 were considered. The effect of anions and cations, which are involved in the redox reactions of actinides, on the stability of ozone and its reactivity has been studied. The reactions of О3 with ions of d- and f-elements were analyzed. Depending on the solution composition and рН value, the reaction can occur directly with the O3 molecule (direct mechanism) and/or with short-lived ion-radical products (•OH, HO 2 • / O 2 − • ${\text{HO}}_{2}^{{\bullet}}/{\text{O}}_{2}^{-{\bullet}}

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18

Vodyanitskii, Yuriy, and Tatiana Minkina. "Changing the properties of samples after extraction from wet soil: a short review." Geochemistry: Exploration, Environment, Analysis 20, no. 4 (2020): 399–407. http://dx.doi.org/10.1144/geochem2020-033.

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Laboratory-dried specimens yield distorted information about the state of hydromorphic soil. Changes in the gas medium, humidity, temperature, aggregation capacity and illumination have an irreversible impact on the dried and powdered soil specimen. Properties of the dried hydromorphic soil can be altered significantly. Most altered are (1) the colour of the hydromorphic soils, (2) the рН value, and (3) the content of mobile trace metal (TM) compounds after drying the wet soil. Colour change (browning) of the hydromorphic soil is related to the oxidation of Fe(II). In a highly ferruginous soil

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19

Grebneva, E. A. "DEVELOPMENT OF AN EMPIRICAL MODEL OF pH LONG-TERM CHANGES IN THE SURFACE WATERS OF THE DEEP-WATER PART OF THE BLACK SEA." Monitoring systems of environment, no. 4 (December 27, 2021): 22–30. http://dx.doi.org/10.33075/2220-5861-2021-4-22-30.

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The paper analyzes the interannual variability of the pH value in the surface layer of the deep-water part of the Black Sea for the period from 1957 to 1996. For the period from 1977 to 1996, an empirical mod-el of the time series is developed and a retrospective forecast is calculated with an assessment of its quali-ty using data from field studies performed from 2019 to 2021. In the interannual course of pH, two sig-nificant quasi-cyclic components of variability with periods of about 6, 7 years and 2.5 years are distin-guished. The highlighted trend (climate trend) indicates a decrease in t

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20

ВЛАДИМИРОВ, Ф. Е., А. Р. ХАКИМОВ, С. О. БАЗАЕВ та С. С. ЮРОЧКА. "ВЛИЯНИЕ ВРЕМЕНИ СУТОК НА ДВИГАТЕЛЬНУЮ АКТИВНОСТЬ, ТЕМПЕРАТУРУ И РН СОДЕРЖИМОГО РУБЦА КРУПНОГО РОГАТОГО СКОТА". Molochnoe i miasnoe skotovodstvo, № 6 (16 січня 2025): 57–61. https://doi.org/10.33943/mms.2024.32.21.011.

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Изучено влияние времени суток на двигательную активность (ДА), pH и температуру содержимого рубца (РpH и РТ) у дойных коров. Исследование проведено на 13 клинически здоровых первотелках голштинской породы при беспривязном их содержании и 3-кратном доении. Кормовой рацион, сбалансированный в соответствии с физиологическими потребностями животных, был одинаковым в течение года. Среднее значение РpH за 3 исследуемых дня у коров составило 6,39, РТ — 39,41°C и ДА — 10,05. Средний показатель РpH находился в диапазоне 5,97—6,77, РТ — 38,85—40,23°C, ДА — 3,73—15,35. Показатели стандартного отклонения

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21

Nyamdelger, Shirchinnamjil, Byambasuren Khulan, Tumen-Ulzii Narangarav, et al. "Design for optimizing copper extraction from aqueous solution using LIX984N extractant." Bulletin of the Institute of Chemistry and Chemical Technology, no. 11 (December 15, 2023): 14–20. http://dx.doi.org/10.5564/bicct.v11i11.3283.

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Copper sulfide concentrate, containing chalcopyrite (CuFeS2), chalcocite (Cu2S), and covellite (CuS) was subjected to low temperature (4000C) oxidation roasting, resulting in water-soluble copper sulfate and insoluble iron oxides. Both chemical and ICP-OES analysis revealed that samples after oxidation roasting contain Cu 28.34%, S 14.37%, Fe 11.28%, Zn 0.35%, Sb 0.58%, As 0.20%, SiO2 5.94%, and Ag 0.65%. The copper dissolution rate of the roasted sample in water was estimated to be 98.48%.This study applied mathematic planning through central composite design (CCD) by “Design Expert 13”, a so

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Pryadko, N. S., H. O. Strelnikov, and K. V. Ternova. "RESEARCH OF SUPERSONIC FLOW IN SHORTENED NOZZLES OF ROCKET ENGINES WITH A BELL-SHAPED TIP." Kosmìčna nauka ì tehnologìâ 30, no. 1 (2024): 03–13. http://dx.doi.org/10.15407/knit2024.01.003.

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The flow in a shortened nozzle with a bell-shaped tip is considered. A comparison of the wave structures of the supersonic gas flow in shortened nozzles with short and long tips formed by compression and stretching of the original bell-shaped nozzle for connection, respectively, with the long and short conical part of the base nozzle at the same nozzle length was carried out. Under operation conditions at sea level and low pressure at the nozzle inlet (P0<50·105 Ра), a large-scale vortex structure, starting from the corner point of the nozzle inlet, is observed in both nozzles. In addition,

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Moisa, S. S., and I. S. Markina. "STUDY OF DYNAMICS OF THE WATER REDOX PROPERTIES DURING PROLONGED EXPOSURE IN A HYPOGEOMAGNETIC FIELD." Aerospace and Environmental Medicine 59, no. 1 (2025): 79–86. https://doi.org/10.21687/0233-528x-2025-59-1-79-86.

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High purity water was a model system to study effects of prolonged exposure in a hypogeomagnetic field (HGMF) on the water redox properties, such as the redox potential, pH value and electric currents. Water samples (40 ml) in glass weighing bottles with ground stoppers were placed for 50 days in a hypogeomagnetic chamber (test). The chamber was a cylinder tube (10 cm in diameter and 50 cm in length) with one end open. The inside walls and bottom were covered with a magnetic field neutralizer – permalloy material. In the center of the chamber the geomagnetic field was weakened in 40 times (~1

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Prokunin, Sergey V., Andrey N. Shchipunov, Daria A. Vengina, et al. "Results of pilot comparisons of national standards for the activity of hydrogen ions in aqueous solutions." Izmeritel`naya Tekhnika, no. 1 (2021): 66–72. http://dx.doi.org/10.32446/0368-1025it.2021-1-66-72.

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The enormous needs in ensuring the measurement of the hydrogen index in various industries and the national economy of Russia make the measurement of the hydrogen index one of the most important methods for monitoring aqueous media. In 2013, work was carried out to enter into the State Register of Measuring Instruments of the Russian Federation a buffer solution and a standard titer with a pH value of 7.00 – a working pH standard of the 2nd category, which is one of the most demanded of non-standard solutions for verification and calibration pH measuring instruments. To confirm the metrologica

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Тихонов, Борис Борисович, Олег Викторович Манаенков, Александр Иванович Сидоров, and Михаил Геннадьевич Сульман. "STUDY OF INFLUENCE OF VARIOUS FACTORS ON DIMENSIONS AND STABILITY OF GOLD NANOPARTICLES." Вестник Тверского государственного университета. Серия: Химия, no. 2(48) (July 7, 2022): 39–48. http://dx.doi.org/10.26456/vtchem2022.2.5.

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В статье синтезированы стабильные наночастицы золота восстановлением золотохлористоводородной кислоты (HAuCl) цитратом натрия (методом Туркевича). Получены спектры образцов наночастиц в области 400-800 нм, подтверждено наличие пиков поверхностного плазмонного резонанса. Определены размеры наночастиц и дзета-потенциал методом динамического рассеяния света. Исследована динамика изменения свойств наночастиц при хранении в течение 10 дней. Исследовано влияние значения рН, присутствия хитозана и глутатиона на свойства наночастиц. The article synthesizes stable gold nanoparticles by reducing hydroch

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Ignatkina, V. A., A. A. Kayumov, and N. D. Yergesheva. "Floatability and calculated reactivity of sulfide minerals and gold." Izvestiya Vuzov. Tsvetnaya Metallurgiya (Universities' Proceedings Non-Ferrous Metallurgy) 28, no. 4 (2022): 4–14. http://dx.doi.org/10.17073/0021-3438-2022-4-4-14.

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The paper provides the results of theoretical reactivity calculations for gold, molybdenum, stibnite, galena, chalcopyrite, arsenopyrite and pyrite in comparison with such experimental data as the floatability of monomineral fractions with butyl xanthate, wetting angle values, changes in the kinetics of the mineral electrode potential. The following calculation series in terms of reactivity and oxidizing ability were established by calculation: Au < Sb2S3 < MoS2 < PbS < CuFeS2 < FeAsS < FeS2. During the Hallimond tube flotation, natural gold grains demonstrated the highest re

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Strilets, O. P., L. S. Petrovska, I. I. Baranova, and Yu. O. Bespala. "A STUDY OF ANTIMICROBIAL ACTIVITY OF FOAM-WASHING AGENT SPECIMENS AT ACIDIC pH VALUES." Annals of Mechnikov Institute, no. 2 (June 7, 2017): 23–26. https://doi.org/10.5281/zenodo.803854.

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<strong>Introduction</strong>. It is well-known that any parapharmaceutical substance, in particular, foam-washing agents comprising water in combination with detergents, extracts, water-soluble vitamins, viscosity regulators, pH, etc., is the ideal environment for microbial growth. Therefore, it is indispensable to use preservatives to protect any foam-washing agent from possible contamination by microorganisms. Their main advantages are: presence of a single antimicrobial and antifungal effect, expanded range of effects, decrease in the risk of resistance of microorganisms and decrease in th

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Strilets, O. P., L. S. Petrovska, I.I. Baranova, and Yu. O. Bespala. "A STUDY OF ANTIMICROBIAL ACTIVITY OF FOAM-WASHING AGENT SPECIMENS AT ACIDIC PH VALUES." Annals of Mechnikov Institute, no. 2 (July 3, 2018): 16–20. https://doi.org/10.5281/zenodo.1303958.

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<strong>Introduction</strong>. It is well-known that any parapharmaceutical substance, in particular, foam-washing agents comprising water in combination with detergents, extracts, water-soluble vitamins, viscosity regulators, pH, etc., is the ideal environment for microbial growth. Therefore, it is indispensable to use preservatives to protect any foam-washing agent from possible contamination by microorganisms. The modern trend is to use multicomponent preserving agents. Their main advantages are: presence of a single antimicrobial and antifungal effect, expanded range of effects, decrease i

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Grebneva, E. A., and A. B. Polonsky. "Decomposition of the time series of the pH values of the surface water of the deep Black Sea according to archival data of the second half of the XXth century." Monitoring systems of environment, no. 2 (June 24, 2021): 29–38. http://dx.doi.org/10.33075/2220-5861-2021-2-29-38.

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Based on the archival data of the Institute of Natural and Technical Systems for the period from 1956 to 1996 the decomposition of the time series of the pH value of the surface layer of the deep-water part of the Black Sea was carried out with subsequent extrapolation until 2010. The analysis shows that the reconstructed time series is divided into two time interval trends with different sign and data quality: from 1956 to 1976 and from 1977 to 1996. The presence of these two fundamentally different time periods is largely due to the method for determining the pH value. Until about the mid-19

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Dmitrieva, Maria V., Vasily D. Myazin, and Ekaterina V. Zolotukhina. "Effect of pH and Nutrient Medium Composition on Dehydrogenase Activity of Extracts Obtained from Escherichia Coli." UNIVERSITY NEWS. NORTH-CAUCASIAN REGION. NATURAL SCIENCES SERIES, no. 3 (219) (September 25, 2023): 140–46. http://dx.doi.org/10.18522/1026-2237-2023-3-140-146.

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“Crude” extracts are a new perspective type of bioelectrocatalysts for biofuel cells. The method of obtaining a “crude” extract by disintegrating bacterial cell membranes (for example, by ultrasound) is simpler and more economical in comparison with pure enzymes. From a scientific point of view, the study of the biocatalytic properties of “crude” extracts is very interesting, since the disintegrated biomass contains a cascade of enzymes involved in the metabolism of microorganisms and coenzymes necessary for oxidative/reductive transformation. This set of bioactive substances makes it possible

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Ступакова, Г. А., Е. Э. Игнатьева, Т. И. Щиплецова, Д. К. Митрофанов та Е. Ю. Ветрова. "СВЕДЕНИЯ О НОВЫХ ТИПАХ КАНДИДАТОВ В СТАНДАРТНЫЕ ОБРАЗЦЫ ЗАСОЛЕННЫХ ПОЧВ". Плодородие, № 3(144) (30 червня 2025): 52–55. https://doi.org/10.25680/s19948603.2025.144.12.

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Представлены результаты разработки комплекта из трех стандартных образцов (СО) состава засоленных почв с аттестованным содержанием ионов: бикарбоната, хлорида, сульфата, кальция, магния, натрия, плотного остатка и величины рН водной вытяжки. Образцы отобраны в разных природно-климатических зонах, подвергнутых техногенному загрязнению (вторичное засоление). Продемонстрированы специфика отбора и подготовки материала СО, этапы разработки СО. Образцы предназначены для обеспечения контроля качества измерений содержания катионно-анионного состава водной вытяжки при агроэкологическом мониторинге и на

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УЛЬЯНОВА, Е. В., and Д. В. АНДРИЕВСКАЯ. "NFLUENCE OF PHENOLIC COMPOUNDS ON THE BOTTLING RESISTANCE OF ALCOHOLIC BEVERAGES." Известия вузов. Пищевая технология, no. 4(388) (December 12, 2022): 13–18. http://dx.doi.org/10.26297/0579-3009.2022.4.2.

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Стабилизация коньяков и повышение их розливостойкости, т. е. устойчивости к помутнениям, является одной из актуальных задач коньячного производства. Исследовано влияние фенольного состава обработанных коньяков на их розливостойкость. На основании мониторинга суммарного содержания фенольных соединений в процессе хранения коньяков в течение 6 мес, а также микроскопирования образовавщихся осадков установлено, что данные соединения участвуют в необратимых коллоидных помутнениях. При анализе спектров оптического поглощения выявлено, что в зависимости от возраста коньяков данные помутнения обусловле

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Степанов, С. В., П. П. Авдеенков, О. С. Пономаренко, and К. М. Морозова. "Determination of kinetic constants and coefficients of biological processes of wastewater treatment of egg advanced processing enterprises." Vodosnabzhenie i sanitarnaia tehnika, no. 10 (October 15, 2022): 40–47. http://dx.doi.org/10.35776/vst.2022.10.05.

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Представлены результаты исследований, проведенных в контактных условиях на активном иле лабораторного реактора периодического действия со сточными водами предприятия по глубокой переработке куриных яиц. В ходе кинетических опытов, основанных на измерении скорости потребления растворенного кислорода, для сточной воды после предварительного коагулирования были установлены следующие усредненные значения кинетических констант процессов биологической очистки: максимальная скорость потребления кислорода при концентрации ила ai → 0 – ρ’max = 44,8 мг/(г·ч) в пересчете на температуру 20 С, константа М

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Гержикова, Виктория Григорьевна, Надежда Станиславовна Аникина, Антонина Валерьевна Весютова, et al. "Study of the effect of alcoholic fermentation on the formation of crystal stability of base wines." Magarach Vinogradstvo i Vinodelie, no. 1(115) (March 22, 2021): 91–96. http://dx.doi.org/10.35547/im.2021.66.70.015.

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Изменение химического состава сусла и мезги в ходе спиртового брожения приводит к нарушению равновесия, отражающегося на значениях интегральных показателей. Цель - изучение превращений компонентов сусла и мезги в ходе спиртового брожения с точки зрения кристаллической стабильности вин. Динамику показателей исследовали в условиях сбраживания мезги и сусла из винограда сорта Каберне-Совиньон. Определяли содержания сахаров, этилового спирта, титруемых и органических кислот (лимонной, яблочной, винной), ионов калия, интегральные показатели (рН, электропроводность, буферная емкость). Склонность к к

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Азопкова, М. А. "Evaluation of garlic regenerant plants of their clones on soil with high acidity." Kartofel` i ovoshi, no. 9 (September 8, 2023): 30–33. http://dx.doi.org/10.25630/pav.2023.81.63.001.

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Чеснок (Allium sativum L.) – вегетативно размножаемое растение, требовательное к плодородию почвы и уровню рН 6-7. При снижении значения рН ниже 5,5 урожайность основных с.-х. культур, в том числе чеснока, снижается более чем на 30%, так как при такой кислотности в почвенном растворе усиливается растворение малорастворимых солей, при этом объем доступных форм железа, марганца, кобальта, меди, алюминия возрастает. По данным агрохимических обследований пашни в РФ доля кислых почв (рН ≤5,5) составила 33% и, по прогнозам, будет увеличиваться. Получение стрессоустойчивых форм растений возможно при

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36

Gaytko, O. M., A. E. Baranchikov, and V. K. Ivanov. "MICROWAVE-HYDROTHERMAL HEXAMETHYLENETETRAMINE-MEDIATED SYNTHESIS OF NANOCRYSTALLINE MnO2." Fine Chemical Technologies 13, no. 2 (2018): 56–63. http://dx.doi.org/10.32362/2410-6593-2018-13-2-56-63.

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The article considers a non-conventional approach to the synthesis of various polymorphic modifications of manganese dioxide. The approach consists in hydrothermal microwave processing of a reaction mixture containing potassium permanganate and hexamethylenetetramine. We emphasize the relevance of the work due to such MnO2 properties as catalytic and photocatalytic activity, its application in accumulators, supercondensers and biochemistry. We report on the first detailed study on the role of temperature, synthesis duration and pH value on the phase composition and morphology of nanocrystallin

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Gerzhikova, Viktoriya, Nadezhda Anikina, Dmitry Pogorelov та ін. "Роль буферной емкости в системе идентификации разбавления вин водой". Magarach. Vinogradstvo i Vinodelie, № 2(108) part: 21 (19 червня 2019): 153–57. http://dx.doi.org/10.35547/im.2019.21.2.015.

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Результаты исследований последних лет показывают, что внесение воды в сусло или вино нарушает баланс ионов, изменяет значения физико-химических, органолептических и интегральных показателей. Одним из наиболее важных показателей, позволяющих установить добавку воды, является буферная емкость вина (БЕ). Буферная емкость вина представляет собой его способность противостоять изменениям рН после добавления сильной кислоты или основания. Сила кислоты характеризуется константой диссоциации. Её отрицательный логарифм pKa означает значение рН, при котором соотношение недиссоциированной и диссоциированн

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Starova, V. "ANALYSIS OF AMINE HARDENERS FOR ADHESIVE USING pH-METRIC TITRATION IN MICELLAR MEDIA OF SODIUM DODECYLSULFATE." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 1 (57) (2020): 27–29. http://dx.doi.org/10.17721/1728-2209.2020.1(57).7.

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One of the primary tasks in the development of amine hardeners for adhesive and epoxy resins is the control of amino group quantities in their composition. The main parameter that indicates the rate of the polymerization reaction and characterizes the quality of the hardener is the amine number. It is determined by the number of primary and secondary amino groups contained in the hardener molecule, because these functional groups are involved in reactions with epoxy resins. The most common methods of analysis of amine hardeners are mainly based on titration in organic solvents and require a pr

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Вьюнков, С. Н. "Curing of urea-formaldehyde resins with a molar ratio of formaldehyde to urea less than one." Известия СПбЛТА, no. 238 (March 11, 2022): 152–59. http://dx.doi.org/10.21266/2079-4304.2022.238.152-159.

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В ходе исследований установлено, что отверждение карбамидоформальдегидных смол (КФС) с образованием пространственно сшитой структуры при мольном соотношении формальдегида к карбамиду менее единицы происходит благодаря образованию инертного соединения – метилендикарбамида (МДК). Для эксперимента синтезировали лабораторную КФС (ЛКФС) по следующей схеме. На первой стадии мольное соотношение карбамид : формальдегид (К : Ф) = 1 : 2. Значение рН 7,5–8. На второй стадии рН снижали до 4,2–4,5. На третьей стадии вводили дополнительный карбамид, pH 7–8, до мольного соотношения К : Ф = 1 : 0,9. Синтез МД

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Игорь Владимирович, Киселев,, Ермолаева, Галина Алексеевна, and Лодыгин, Алексей Дмитриевич. "Study of the Mashing Mode Effect on Indicators of Wort Obtained with the Use of Chicory." Beer and beverages, no. 4 (December 22, 2022): 8–11. http://dx.doi.org/10.52653/pin.2022.04.04.008.

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Рассмотрен биотехнологический потенциал цикория и обоснована актуальность его применения в пивоварении. Целью исследования было обоснование технологических способов и параметров затирания солода, позволяющих получить сусло с заданными физико-химическими и реологическими свойствами. В работе были использованы следующие методы исследований: определение продолжительности осахаривания, массовой доли сухих веществ и концентрации редуцирующих веществ, рН и динамической вязкости сусла. Рассмотрены различные режимы затирания солода (настойный, одноотварочный) без замены солода на цикорий и с заменой 1

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Azarenko, Yulia, Zhanna Alekseeva, and Sergey Zinenko. "Assessment of fallow grey forest soils fertility in sub-taiga zone of Omsk Priirtyshye." E3S Web of Conferences 462 (2023): 03042. http://dx.doi.org/10.1051/e3sconf/202346203042.

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There is a need to obtain information on the current state of their properties when reintroducing fallow soils into arable land. The aim of the research was to study fertility indicators of grey forest soils (Luvic Greyzemic Phaeozems) The research area was located in the city of Tara, Omsk region (south of Western Siberia). A field survey of soils and vegetation cover was carried out in plots with different age of fallow land with the establishment of the value of the above ground mass. The results of the research showed that the fallow area with age of less than 10 years is represented by a

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Ts, Zagarzusem, Sugir-Erdene N, Orgilbayar B, et al. "Technological study on the flotation process of Manganese Ore." Bulletin of the Institute of Chemistry and Chemical Technology, no. 8 (December 31, 2020): 50–54. http://dx.doi.org/10.5564/bicct.v0i8.1478.

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This study demonstrated the importance of appropriate flotation conditions and reagent dosage for the separation of standard manganese concentrates from low-grade manganese ores. The research object used Unagad manganese ore located in Dornogovi province. The main mineral of manganese ores was pyrolusite (MnO2). According to the chemical element analyses, the content of manganese in the primary ore was Mn-17.31%. XRD analyses revealed minerals such as quartz, pyrolusite, albite, anorthite, anorthoclase, orthoclase, and hausmannite. This study conducted the beneficiation of manganese ore by the

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Selemenev, Vladimir F., Natalia A. Belanova, Natalia V. Mironenko, et al. "Interaction of melanoidins, proline, and valine with sorbents of various nature." Сорбционные и хроматографические процессы 24, no. 1 (2024): 63–75. http://dx.doi.org/10.17308/sorpchrom.2024.24/12022.

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The isolation of pure amino acids from industrial solutions is one of the important tasks of production. Solutions of amino acids obtained as a result of chemical or microbiological treatment contain a number of impurities, mostly organic ones. The microbiological synthesis of proline is accompanied by the presence of valine, leucine, alanine, and coloured high-molecular components in the culture liquid that belong to the melanoidin group. Melanoidins of proline acid production are high-molecular compounds containing amino acid fragments, heterocyclic structures, and amide bonds. Melanoidins i

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Semashchuk, Roman. "Anisotropicity of PH indicator in initial rendzinas soils between the ecotope European Black Pine (Pinus Nigra)." Visnyk of the Lviv University. Series Geography, no. 51 (December 27, 2017): 314–21. http://dx.doi.org/10.30970/vgg.2017.51.8889.

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The article deals with the issue of the relationship between woody plant formations and soils in the process of soil formation on dense carbonate rocks. A review of the literature was made and the problems of carrying out such researches and establishment of interconnections between plants and soils were revealed. In particular, contradictions in the views on the spatial organization of soil cover under the forest, the allocation of an elementary unit of soil and vegetation cover, the influence of the soil-memory factor and the methods of conducting relevant research. The basis of the study is

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Sukhova, O. V., and V. A. Polonskyy. "Peculiarities in structure formation and corrosion of cast quasicrystalline Al63Cu25Fe12 and Al63Co24Cu13 alloys in sodium chloride aqueous solution." Physics and Chemistry of Solid State 21, no. 3 (2020): 530–36. http://dx.doi.org/10.15330/pcss.21.3.530-536.

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In this work the structure and corrosion behavior of quasicrystalline cast Al63Cu25Fe12 and Al63Co24Cu13 alloys in 5-% sodium chloride solution (рН 6.9–7.1) were investigated. The alloys were cooled at 5 К/s. The structure of the samples was studied by methods of quantitative metallography, X-ray analysis, and scanning electron microscopy. Corrosion properties were determined by the potentiodynamic method. The made investigations confirm the formation of stable quasicrystalline icosahedral (y) and decagonal (D) phases in the structure of Al63Cu25Fe12 and Al63Co24Cu13 alloys correspondingly. In

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Kryshtopa, Sviatoslav, Liudmyla Kryshtopa, Yu S. Vlasyuk та F. V. Kozak. "Improvement of fuel and economic characteristics of diesel engines by their converтing to methanol conversion gas products". Avtoshliakhovyk Ukrayiny 1, № 269 (2022): 2–13. http://dx.doi.org/10.33868/0365-8392-2022-1-269-2-13.

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The work is aimed at solving the problem of conversion of existing diesel power drives of technological transport into gaseous fuels, which are a cheaper alternative to diesel fuel. A method has been proposed to increase the energy efficiency of alternative fuels. The thermochemical essence of increasing the energy of the source fuel has been developed. The choice of alternative alcohol fuel as a starting product for the conversion process, taking into account its cost and energy value. The calculations showed that the thermal effect from the combustion of converted CO and Н2 exceeds the effec

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Vasilchenko, S. A., G. V. Metlina, and Yu V. Laktionov. "THE EFFECT OF SEED INOCULATION BY RHIZOTORFIN STRAINS ON CHICKPEA PRODUCTIVITY IN THE SOUTHERN PART OF THE ROSTOV REGION." Grain Economy of Russia, no. 4 (August 23, 2018): 35–38. http://dx.doi.org/10.31367/2079-8725-2018-58-4-35-38.

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The article presents the study results of seed inoculation by specific strains Mesorhizobiumciceri on number and weight of chickpea root nodules, productivity and nutrition value of chickpea cultivated in the southern nature-climatic part of the Rostov region. The study was conducted on the fields of FSBSI “Agricultural Research Center “Donskoy” (in the laboratory of cultivation technology of row crops) located in the southern part of the Rostov region in 2015–2016. The soil of the plot was heavy loamy carbonate blackearth (chernozem) with 7.0 рН, 3.2% of humus, 18–25 of P2O5 mg/kg of soil and

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Ts, Erdenebat, Unurzaya M, Uuriintsolmon B, Vanchinkhuu J, and Purev Sh. "Physics-chemical study for liquid glass from abundance distributed silicate mineral in Mongolia." Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, no. 5 (November 30, 2018): 46–51. http://dx.doi.org/10.5564/bicct.v0i5.1073.

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In this paper physics-chemical properties kinematic viscosity, liquid density, UV light adsorption, particle size distribution with photon cross correlation spectroscopy (PCCS) were studied in various colloidal silica sol pH value for the disperse system of soluble silica bulk as liquid glass by adding the alkali compounds to silica dioxide in silica stone of Sereglen soum, Tuv province, Mongolia. The results show that possibility to get the silica bulk as raw material for liquid glass production at molar optimal ratio (Mx) 2 for silica to alkali metal oxide by using the sol distribution width

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Varynskyi, B. О., M. Yu Zeleniuk, and A. H. Kaplaushenko. "Determination of riboflavin in dragee “Revit” by HPLC." Current issues in pharmacy and medicine: science and practice 15, no. 2 (2022): 140–44. http://dx.doi.org/10.14739/2409-2932.2022.2.258888.

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The aim of the work is development of express, selective, reproducible methods for the determination of riboflavin by HPLC in a multivitamin preparation, dragee “Revit”. Materials and methods. Degasser, binary pump, autosampler, thermostated column compartment, diode array detector. Chromatographic column Zorbax SB-C18, 30 mm × 4.6 mm, 1.8 µm. Samples were prepared using analytical electronic scales Kern ABT 100-5M, ultrasonic bath Ultrasonic XUBA 3, nylon ultrafilters 0.12 µm. Results. 0.1 % formic acid was selected as a buffer solution in the eluent. The maximum values of logD were observed

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Семин, М. М., Н. Р. Токарев, М. В. Явтушенко, Ф. И. Лобанов, Т. Е. Чукалина, and А. В. Плеханов. "Use of a chemical regulator at the wastewater treatment facilities operated by MUE Vodokanal of Podolsk." Vodosnabzhenie i sanitarnaia tehnika, no. 2 (February 16, 2022): 37–40. http://dx.doi.org/10.35776/vst.2022.02.05.

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Рассмотрена возможность использования природных минералов на основе карбоната кальция (монокальцита) для регулирования рН (карбонат-бикарбонатное равновесие), повышения очищающего действия бактерий активного ила в аэротенке и улучшения седиментационных свойств активного ила во вторичном отстойнике. Коррекция седиментационных свойств активного ила происходит за счет взаимодействия между функциональными кислородсодержащими группами флокулообразующих бактерий активного ила и ионами кальция. В результате образуются прочные, быстро оседающие хлопья и, как следствие, снижается значение илового индек

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