Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_07
Ana Birsan, Veaceslav Sprincean, Ion Ganea
Advanced technologies based on UVA were used to monitor some natural and artificial ecosystems in the Orheiul Vechi Natural-Cutural Reserve protected area. The analysis of some biological variables with a decisive role in ensuring the sustainability of ecosystems was carried out with the help of multispectral cameras. The methods used offered the possibility of identifying the main elements of the studied area and allowed their classification into four main classes of land use/coverage: 1) land covered with spontaneous vegetation (grasses, shrubs and trees); 2) cultivated agricultural land; 3) land devoid of vegetation; 4) land with constructions. Multispectral sensors have been shown to be effective in the identification of different components of the environment, showcasing opportunities for their use in the maintenance and improvement of the e
{"title":"Opportunities for use in practice of intelligent technologies in the evaluation of some biological variables","authors":"Ana Birsan, Veaceslav Sprincean, Ion Ganea","doi":"10.59295/sum1(171)2023_07","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_07","url":null,"abstract":"Advanced technologies based on UVA were used to monitor some natural and artificial ecosystems in the Orheiul Vechi Natural-Cutural Reserve protected area. The analysis of some biological variables with a decisive role in ensuring the sustainability of ecosystems was carried out with the help of multispectral cameras. The methods used offered the possibility of identifying the main elements of the studied area and allowed their classification into four main classes of land use/coverage: 1) land covered with spontaneous vegetation (grasses, shrubs and trees); 2) cultivated agricultural land; 3) land devoid of vegetation; 4) land with constructions. Multispectral sensors have been shown to be effective in the identification of different components of the environment, showcasing opportunities for their use in the maintenance and improvement of the e","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_23
Stefan Robu, Tamara Potlog, Ion Lungu, Petru Bulmaga, Pavel Tiuleanu, Viorel Prisacari, Veronica Sava
The paper describes the synthesis of polymer analogues of N-vinylpyrrolidone with acryloyl chloride functionalized with zinc phthalocyanine, by using the Friedel-Crafts method. The grafting of zinc phthalocyanine to Nvinylpyrrolidone copolymers was carried out at low temperatures (3-5 ⁰C), using the anhydrous AlCl3 catalyst. The purification of the new polymers was carried out by sedimentation in water. The chemical structure of polymer analogues were performed by IR, UV/Vis spectroscopy. The bactericidal properties of the synthesized polymer analogs were studied. The antibacterial activity of grafted copolymers with zinc phthalocyanine was performed „in vitro”, with a series of bactericidal cultures such as S. Aureus, E. Coli, Ps. Aeruginosa and others. It has been shown that the obtained polymer analogs possess relatively high bactericidal activity against some cultures such as Ps. Aeruginosa, Pr. Vulgaris to the action of furacilin or chlorhexidines, used as controls.
{"title":"Synthesis of water-soluble analogs-polymers of poly-N-vinylpyrolidone grafted with zinc phthalocyanine","authors":"Stefan Robu, Tamara Potlog, Ion Lungu, Petru Bulmaga, Pavel Tiuleanu, Viorel Prisacari, Veronica Sava","doi":"10.59295/sum1(171)2023_23","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_23","url":null,"abstract":"The paper describes the synthesis of polymer analogues of N-vinylpyrrolidone with acryloyl chloride functionalized with zinc phthalocyanine, by using the Friedel-Crafts method. The grafting of zinc phthalocyanine to Nvinylpyrrolidone copolymers was carried out at low temperatures (3-5 ⁰C), using the anhydrous AlCl3 catalyst. The purification of the new polymers was carried out by sedimentation in water. The chemical structure of polymer analogues were performed by IR, UV/Vis spectroscopy. The bactericidal properties of the synthesized polymer analogs were studied. The antibacterial activity of grafted copolymers with zinc phthalocyanine was performed „in vitro”, with a series of bactericidal cultures such as S. Aureus, E. Coli, Ps. Aeruginosa and others. It has been shown that the obtained polymer analogs possess relatively high bactericidal activity against some cultures such as Ps. Aeruginosa, Pr. Vulgaris to the action of furacilin or chlorhexidines, used as controls.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_06
Dumitru Bulat, Nicolae Saptefrati, Denis Bulat, Gheorghe Avornic
The fishing regulatory measures that have been applied over the years in the Republic of Moldova in natural ecosystems have not always been effective - either through the faulty organization of the exploitation of fish resources, non-compliance with the fishing regime, failure to assess the state of fish resources, the ineffectiveness of ameliorative measures etc., or through the imperfection of the normative framework. In this paper, for the first time, an analysis of the existing normative acts in the field of protection of aquatic biological resources in the Republic of Moldova is made in historical and content terms. Also, an attempt was made to harmoniously integrate the scientific results from the field of ichthyology into that of environmental law. Following the multi-systemic approach of the existing normative framework in the field of exploitation and protection of aquatic biological resources, scientifically argued recommendations and proposals were submitted to improve the legislation in the field.
{"title":"Evolution of regulations in the field of fisheries, protection and use of natural aquatic biological resources","authors":"Dumitru Bulat, Nicolae Saptefrati, Denis Bulat, Gheorghe Avornic","doi":"10.59295/sum1(171)2023_06","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_06","url":null,"abstract":"The fishing regulatory measures that have been applied over the years in the Republic of Moldova in natural ecosystems have not always been effective - either through the faulty organization of the exploitation of fish resources, non-compliance with the fishing regime, failure to assess the state of fish resources, the ineffectiveness of ameliorative measures etc., or through the imperfection of the normative framework. In this paper, for the first time, an analysis of the existing normative acts in the field of protection of aquatic biological resources in the Republic of Moldova is made in historical and content terms. Also, an attempt was made to harmoniously integrate the scientific results from the field of ichthyology into that of environmental law. Following the multi-systemic approach of the existing normative framework in the field of exploitation and protection of aquatic biological resources, scientifically argued recommendations and proposals were submitted to improve the legislation in the field.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_14
Cristina Grajdieru, Elena Bylici
The results of molecular expertise of phytosanitary state of upper layer of soil from experimental cornfields are presented. Several fungal pathogens from Fusarium, Aspergillus and Penicillium genera were identified using PCR assay. These pathogens were identified in soil samples during the three-year monitoring period and their respective quantities depended on weather conditions. Abiotic factors like air temperature and relative humidity have a significant impact on fungi’s propagation. Weather conditions of the year affected significantly accumulation of F. equiseti, F. graminearum, A. clavatus, P. expansum and P. chrysogenum in soil. A positive correlation between pathogens’ quantities and values of relative air humidity was found.
{"title":"Dynamics of maize pathogens from Fusarium, Aspergillus and Penicillium genera in soil under weather conditions of Republic of Moldova","authors":"Cristina Grajdieru, Elena Bylici","doi":"10.59295/sum1(171)2023_14","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_14","url":null,"abstract":"The results of molecular expertise of phytosanitary state of upper layer of soil from experimental cornfields are presented. Several fungal pathogens from Fusarium, Aspergillus and Penicillium genera were identified using PCR assay. These pathogens were identified in soil samples during the three-year monitoring period and their respective quantities depended on weather conditions. Abiotic factors like air temperature and relative humidity have a significant impact on fungi’s propagation. Weather conditions of the year affected significantly accumulation of F. equiseti, F. graminearum, A. clavatus, P. expansum and P. chrysogenum in soil. A positive correlation between pathogens’ quantities and values of relative air humidity was found.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_20
Vladimir Sheptitskiy, Ana Leorda, Viorica Raischi, Olesea Grosul-Raileanu
This paper summarises modern approaches to the morphofunctional dynamics of spermatogenesis as a complex dynamic process with well-organised cellular and molecular events, which includes three specific basic functional steps - spermatocytogenesis (mitosis), meiosis and spermiogenesis (differentiation with no cell division), and leads to sperm production. The first stage involves the differentiation of spermatogonia (small diploid germ cells) by mitotic division into primary spermatocytes. The second stage requires meiosis, in which diploid cells - spermatocytes form round haploid spermatids. The final stage of spermatogenesis involves the production of mature, motile spermatozoa from round spermatids in a process called spermiogenesis. At any of these stages, functional disorders can occur, which can lead to disruption of the whole process and infertility. To date, a comprehensive understanding of the cell biology and genetics of spermatogenesis is difficult as it takes place in a complex testicular environment, characterised by a close association of developing spermatozoa with additional cells. Therefore, it is necessary to intensify the study of the mechanisms of the morphofunctional dynamics of spermatogenesis and its regulation in general and at different stages.
{"title":"Modern approaches to morphofunctional dynamics of spermatogenesis process","authors":"Vladimir Sheptitskiy, Ana Leorda, Viorica Raischi, Olesea Grosul-Raileanu","doi":"10.59295/sum1(171)2023_20","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_20","url":null,"abstract":"This paper summarises modern approaches to the morphofunctional dynamics of spermatogenesis as a complex dynamic process with well-organised cellular and molecular events, which includes three specific basic functional steps - spermatocytogenesis (mitosis), meiosis and spermiogenesis (differentiation with no cell division), and leads to sperm production. The first stage involves the differentiation of spermatogonia (small diploid germ cells) by mitotic division into primary spermatocytes. The second stage requires meiosis, in which diploid cells - spermatocytes form round haploid spermatids. The final stage of spermatogenesis involves the production of mature, motile spermatozoa from round spermatids in a process called spermiogenesis. At any of these stages, functional disorders can occur, which can lead to disruption of the whole process and infertility. To date, a comprehensive understanding of the cell biology and genetics of spermatogenesis is difficult as it takes place in a complex testicular environment, characterised by a close association of developing spermatozoa with additional cells. Therefore, it is necessary to intensify the study of the mechanisms of the morphofunctional dynamics of spermatogenesis and its regulation in general and at different stages.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_11
Mihail Mustea, Serghei Filipenco, Dumitru Bulat
The sun perch was recorded for the first time at the mouth of the Dniester in 1952. In the ichthyofauna of the Cuciurgan harbor in 1965. Starting with the second half of the 1960s, it was not recorded in the Cuciurgan refrigeration lake until the 2000s. From 2004, unique specimens were recorded, which probably hit, together with the water pumped from the Turunchuk arm. The share of sun perch in the control catches of Cuciurgan Refrigerating Lake increased from 0.5% in 2008 to a record 15.7% in 2017. The high abundance of sun perch in a short period is explained by the type of portioned reproduction, high prolificacy, early age of sexual maturity and also care for offspring. In the Cuciurgan reservoir, mature sun perch females weighing 7.2 g were captured, and with a weight of 13.4 g they were identified in stage IV of gonad maturation. The sun perch of the Cuciurgan Refrigerating Lake is characterized by a high growth rate, thus the maximum standard body length is greater than 17 cm with a mass of 220 g. A polynomial model was used to approximate the sun perch abundance monitoring data of degree IV (reliability coefficient R2 = 0.8211), which determines the characteristic of rapid growth of invasive fish species, then followed for 4 years a stage of stabilization of the population, after which it is characterized by a decrease in abundance, due to the appearance of a foreign species in the tank – the mud crab.
{"title":"Biological particulars of the sun perch – Lepomis gibbosus (linnaeus, 1758) from the Cuciurgan reservoir-cooler","authors":"Mihail Mustea, Serghei Filipenco, Dumitru Bulat","doi":"10.59295/sum1(171)2023_11","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_11","url":null,"abstract":"The sun perch was recorded for the first time at the mouth of the Dniester in 1952. In the ichthyofauna of the Cuciurgan harbor in 1965. Starting with the second half of the 1960s, it was not recorded in the Cuciurgan refrigeration lake until the 2000s. From 2004, unique specimens were recorded, which probably hit, together with the water pumped from the Turunchuk arm. The share of sun perch in the control catches of Cuciurgan Refrigerating Lake increased from 0.5% in 2008 to a record 15.7% in 2017. The high abundance of sun perch in a short period is explained by the type of portioned reproduction, high prolificacy, early age of sexual maturity and also care for offspring. In the Cuciurgan reservoir, mature sun perch females weighing 7.2 g were captured, and with a weight of 13.4 g they were identified in stage IV of gonad maturation. The sun perch of the Cuciurgan Refrigerating Lake is characterized by a high growth rate, thus the maximum standard body length is greater than 17 cm with a mass of 220 g. A polynomial model was used to approximate the sun perch abundance monitoring data of degree IV (reliability coefficient R2 = 0.8211), which determines the characteristic of rapid growth of invasive fish species, then followed for 4 years a stage of stabilization of the population, after which it is characterized by a decrease in abundance, due to the appearance of a foreign species in the tank – the mud crab.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_12
Mihail Mustea
Aterina boyeri for the first time was recorded the cooling lake Cuciurgan in the 1980s. According to our assumptions, nimerind, together with the water pumped from the Turunchuk arm. Being an invasive species with a short life cycle – aterina boyeri, due to its wide ecological valence and high reproductive potential, it occupied, in a short time, a superdominant position. Currently, it is the most numerous fish species in the lake, whose share during the years 2019-2022 reaches the value of 55,3%. The growth rate and age structure of the local population has halved. Due to the high mineralization and increased thermalization of the reservoir, the aterina boyeri, being a mediterranean, thermophilic species, found a favorable ecological niche here. According to the dominance index, it belongs to the D5 category, according to the constancy index – C3, according to the environmental significance index – to the W5 category. The maximum size and weight of males is 9.4 cm and 3.9 g, and females are 9.8 cm and 4.3 g, which is smaller compared to the marine form. In the period of 2008-2022, there is an exponential increase in the population of the aterina boyeri, which can lead to the exclusion of indigenous fish species.
{"title":"Biological characteristics of atherina boyeri of the Kucchurgan reservoir lake","authors":"Mihail Mustea","doi":"10.59295/sum1(171)2023_12","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_12","url":null,"abstract":"Aterina boyeri for the first time was recorded the cooling lake Cuciurgan in the 1980s. According to our assumptions, nimerind, together with the water pumped from the Turunchuk arm. Being an invasive species with a short life cycle – aterina boyeri, due to its wide ecological valence and high reproductive potential, it occupied, in a short time, a superdominant position. Currently, it is the most numerous fish species in the lake, whose share during the years 2019-2022 reaches the value of 55,3%. The growth rate and age structure of the local population has halved. Due to the high mineralization and increased thermalization of the reservoir, the aterina boyeri, being a mediterranean, thermophilic species, found a favorable ecological niche here. According to the dominance index, it belongs to the D5 category, according to the constancy index – C3, according to the environmental significance index – to the W5 category. The maximum size and weight of males is 9.4 cm and 3.9 g, and females are 9.8 cm and 4.3 g, which is smaller compared to the marine form. In the period of 2008-2022, there is an exponential increase in the population of the aterina boyeri, which can lead to the exclusion of indigenous fish species.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_13
Iurie Bacalov, Adriana Druta, Elena Chirita, Aurelia Crivoi, Sergiu Dobrojan
The researched biopreparation has a beneficial effect on the processes of hormone synthesis in the body and presents biostimulatory effects on the β-cells of the islets of Langerhans in the endocrine pancreas, simultaneously increasing insulin, thyroxine and triiodothyronine secretion, thus maintaining metabolic homeostasis in the body. The investigations carried out highlighted the positive aspects of the biopreparation on the endocrine glands investigated against the background of experimental diabetes.
{"title":"The impact of spirulina grown on wastewater on the functional status of the thyroid gland on the background experimental diabetes","authors":"Iurie Bacalov, Adriana Druta, Elena Chirita, Aurelia Crivoi, Sergiu Dobrojan","doi":"10.59295/sum1(171)2023_13","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_13","url":null,"abstract":"The researched biopreparation has a beneficial effect on the processes of hormone synthesis in the body and presents biostimulatory effects on the β-cells of the islets of Langerhans in the endocrine pancreas, simultaneously increasing insulin, thyroxine and triiodothyronine secretion, thus maintaining metabolic homeostasis in the body. The investigations carried out highlighted the positive aspects of the biopreparation on the endocrine glands investigated against the background of experimental diabetes.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents the results of the study of the adsorption of vitamin B6 on two samples of autochthonous activated carbon: AC-C and CAN-8. The adsorption kinetics data, determined at three values of initial concentration, show that the immobilization rate of vitamin B6 increases with increasing contact time between the two phases and is a function of the initial adsorbate concentration. The adsorption isotherms of vitamin B6 were processed using the equations of Langmuir and Freundlich adsorbtion, model. It was determined that the immobilization of vitamin B6 on the studied adsorbants is better described by the Langmuir model. The maximum adsorption values recorded for activated carbons AC-C and CAN-8 are in concordance with the structural parameters of the investigated carbons. The realized research shows that emergent contaminants, such as vitamin B6, can be effectively immobilized and removed from aqueous solutions using autochthones activated carbons AC-C and CAN-8 as adsorbents obtained from local raw material.
{"title":"Study of the adsorption processes of vitamin B6 on autochthonous carbon adsorbents","authors":"Nina Timbaliuc, Oleg Petuhov, Tudor Lupascu, Nina Boldurescu","doi":"10.59295/sum1(171)2023_24","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_24","url":null,"abstract":"The paper presents the results of the study of the adsorption of vitamin B6 on two samples of autochthonous activated carbon: AC-C and CAN-8. The adsorption kinetics data, determined at three values of initial concentration, show that the immobilization rate of vitamin B6 increases with increasing contact time between the two phases and is a function of the initial adsorbate concentration. The adsorption isotherms of vitamin B6 were processed using the equations of Langmuir and Freundlich adsorbtion, model. It was determined that the immobilization of vitamin B6 on the studied adsorbants is better described by the Langmuir model. The maximum adsorption values recorded for activated carbons AC-C and CAN-8 are in concordance with the structural parameters of the investigated carbons. The realized research shows that emergent contaminants, such as vitamin B6, can be effectively immobilized and removed from aqueous solutions using autochthones activated carbons AC-C and CAN-8 as adsorbents obtained from local raw material.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.59295/sum1(171)2023_25
Tatiana Isac-Gutul, Elena Tutovan, Denis Nika
Advanced oxidation processes (AOP) are widely used for the degradation of antibiotics and other micropollutants in surface and waste waters. The degree of degradation of a drug by an AOP can be predicted from the rate constant of the interaction of hydroxyl radicals with the substrate - KOH+S value, as well as from other physicochemical properties accompanying the degradation processes, and therefore these factors are important for the design of technological schemes of treatment of polluted water. Moreover, a substrate withKOH+S value known can be used to evaluate the applicability and efficiency of AOP and elucidate the kinetics and degradation mechanism of the given pollutant. In this work, the rate of the oxidation of N,N-Dimethyl-p-nitrosoaniline (PNDMA) during the photolysis of hydrogen peroxide in distilled water and in the presence of different amounts of polluted water (aqueous solutions containing sulfonamides – acetazolamide (AC) and phthalylsulfathiazole (FL), fluoroquinilones - moxifloxacin (MOX) and ciprofloxacin (CPF) as pollutants) in the UV - H2O2 systems was studied. The concentration of the drugs varied between 2.5 mg/L and 25 mg/L. The ,,ДРТ-1000” high-pressure mercury vapor lamp as the irradiation source was used. Using competitive acceptors method and based on the kinetic curves, the interaction constants of •OH radicals with the mentioned drugs were determined: kOH+AC = 8.5 ×109 L/mol×s; kOH+FL = 8.5×109 L/mol×s; kOH+MOX = 1.42×109 L/mol×s; kOH+CPF = 6.3×109 L/mol×s and the inhibiting capacity of natural waters Σ ki[Si] in the selfpurification process in the model systems used. The calculated values of the respective constants are varies between (5.4-17.7)×106 s-1.
{"title":"The rate constants KOH+S with some antibiotics determination by the competetive inhibitors method","authors":"Tatiana Isac-Gutul, Elena Tutovan, Denis Nika","doi":"10.59295/sum1(171)2023_25","DOIUrl":"https://doi.org/10.59295/sum1(171)2023_25","url":null,"abstract":"Advanced oxidation processes (AOP) are widely used for the degradation of antibiotics and other micropollutants in surface and waste waters. The degree of degradation of a drug by an AOP can be predicted from the rate constant of the interaction of hydroxyl radicals with the substrate - KOH+S value, as well as from other physicochemical properties accompanying the degradation processes, and therefore these factors are important for the design of technological schemes of treatment of polluted water. Moreover, a substrate withKOH+S value known can be used to evaluate the applicability and efficiency of AOP and elucidate the kinetics and degradation mechanism of the given pollutant. In this work, the rate of the oxidation of N,N-Dimethyl-p-nitrosoaniline (PNDMA) during the photolysis of hydrogen peroxide in distilled water and in the presence of different amounts of polluted water (aqueous solutions containing sulfonamides – acetazolamide (AC) and phthalylsulfathiazole (FL), fluoroquinilones - moxifloxacin (MOX) and ciprofloxacin (CPF) as pollutants) in the UV - H2O2 systems was studied. The concentration of the drugs varied between 2.5 mg/L and 25 mg/L. The ,,ДРТ-1000” high-pressure mercury vapor lamp as the irradiation source was used. Using competitive acceptors method and based on the kinetic curves, the interaction constants of •OH radicals with the mentioned drugs were determined: kOH+AC = 8.5 ×109 L/mol×s; kOH+FL = 8.5×109 L/mol×s; kOH+MOX = 1.42×109 L/mol×s; kOH+CPF = 6.3×109 L/mol×s and the inhibiting capacity of natural waters Σ ki[Si] in the selfpurification process in the model systems used. The calculated values of the respective constants are varies between (5.4-17.7)×106 s-1.","PeriodicalId":30698,"journal":{"name":"Studia Universitatis Moldaviae Stiinte reale si ale naturii","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135639582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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