Acta Chimica Slovaca最新文献_第8页

Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum 烟气脱硫石膏制备碳酸钙的反应性

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0003

J. Jurišová, V. Danielik, P. Fellner, M. Králik, Tomáš Foltinovič

{"title":"Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum","authors":"J. Jurišová, V. Danielik, P. Fellner, M. Králik, Tomáš Foltinovič","doi":"10.2478/acs-2019-0003","DOIUrl":"https://doi.org/10.2478/acs-2019-0003","url":null,"abstract":"Abstract Reactivity of various calcium carbonate samples for flue gas desulfurization was tested. Two groups of CaCO3 samples were considered; natural limestone containing calcite phase dominantly and samples prepared by the conversion of gypsum with ammonium and carbon dioxide (precipitated CaCO3) containing different amounts of calcite, aragonite and vaterite. Reactivity of precipitated calcium carbonate depends primarily on the particle size, similarly as in case of industrial samples. The initial reaction rate was comparable with the industrial limestones for samples with the average particle size lower than 15 μm. However, the conversion of laboratory samples was significantly higher after 5 min of the reaction. Phase composition of the precipitated calcium carbonate has a minor but noticeable impact on the reactivity. The presence of vaterite slightly increased the reactivity, which is in accordance with its lower compact structure in comparison with calcite and aragonite. Unexpected effect of the increased content of aragonite, which is the most compact phase in comparison with calcite and vaterite, was observed. If calcium carbonate contains up to approximately 30 % of aragonite the reactivity increases, which can be explained by the SEM pictures showing agglomerate composition with relatively high specific surface. At higher contents of aragonite, the reactivity decreases. All the obtained results proved the suitability of precipitated CaCO3 prepared from flue gas desulfurization gypsum to be recycled in the flue gas desulfurization process.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47554187","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}

引用次数: 1

Application of photochromic pigment in mass dyed polypropylene fibres intended for intelligent textiles 光致变色颜料在智能纺织品用大量染色聚丙烯纤维中的应用

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0012

Veronika Hrabovská, M. Hricová, A. Ujhelyiová

引用次数: 2

Recombinant human erythropoietin separation using a cation-exchange multimodal adsorbent 用阳离子交换多模态吸附剂分离重组人促红细胞生成素

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0015

Marta Ostrihoňová, Jana Adamíková, T. Molnár, M. Antošová, M. Polakovič

引用次数: 0

Prevalence of Staphylococcus aureus and antibiotic resistant Staphylococcus aureus in public transport in Bratislava, Slovakia 斯洛伐克布拉迪斯拉发公共交通中金黄色葡萄球菌和耐药金黄色葡萄球菌的流行情况

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0007

A. Medveďová, Romana Györiová

{"title":"Prevalence of Staphylococcus aureus and antibiotic resistant Staphylococcus aureus in public transport in Bratislava, Slovakia","authors":"A. Medveďová, Romana Györiová","doi":"10.2478/acs-2019-0007","DOIUrl":"https://doi.org/10.2478/acs-2019-0007","url":null,"abstract":"Abstract There is evidence that the transmission of Staphylococcus aureus and methicillin-resistant S. aureus between the community and environmental surfaces still exists. Even the means of this transmission remain uncertain, the public transport system may serve as a potential source of different bacteria, and the contact with contaminated public surfaces may increase the risk for bacterial diseases emergence. This study aimed to investigate S. aureus contamination on Bratislava’s public transport vehicles. Forty samples of hand-touched surfaces were collected during December 2015 and March 2017 by using surface sampling method. S. aureus was detected in all analysed swabs. Simultaneously, antibiotic resistance of S. aureus from swabs was evaluated. Of 40 samples, only 23 % did not contain S. aureus resistant to some of 10 analysed antibiotics. On the other hand, the severe prevalence of highly resistant S. aureus to penicillin, methicillin, ampicillin, and cefoxitin was confirmed. 15 % of isolates displayed resistance to at least three antimicrobial classes. The amount of S. aureus was not significantly influenced by the lines or by the analysed surface (grabs rails or on-board stop buttons). However, there was a statistically significant effect of year period, both between samples from December and March and between samples from the same month but different year. The study confirmed the widespread occurrence of resistant S. aureus in public transport vehicles in Bratislava, Slovakia.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/acs-2019-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43116739","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}

引用次数: 1

Electrolytic colouring of anodized aluminium on tin basis 锡基阳极氧化铝的电解着色

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0002

Barbora Šopová, M. Zemanová

引用次数: 0

Trichoderma atroviride: an isolate from forest environment with secondary metabolites with high antimicrobial potential 萎缩木霉：一个来自森林环境的具有高抗菌潜力的次级代谢产物的分离物

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0008

J. Víglaš, P. Olejníková

{"title":"Trichoderma atroviride: an isolate from forest environment with secondary metabolites with high antimicrobial potential","authors":"J. Víglaš, P. Olejníková","doi":"10.2478/acs-2019-0008","DOIUrl":"https://doi.org/10.2478/acs-2019-0008","url":null,"abstract":"Abstract This work was focused on the characterization of novel isolate of Trichoderma atroviride O1, found in the forest around the village of Zázrivá (the Northern Slovakia, region Orava). The isolate was identified by sequencing its internal transcribed spacer (ITS) region of rDNA. T. atroviride O1 stimulated the development of lateral roots of model plant Lepidium sativum. Simultaneously, the isolate has proved its high mycoparasitic potential as it displayed the ability to attack colonies of phytopathogenic fungi (Alternaria alternata, Fusarium culmorum, Botrytis cinerea). This isolate produced secondary metabolites, which were isolated and tested for the antimicrobial activity against gram-positive bacteria Staphylococcus epidermidis and Staphylococcus aureus. The growth of these bacteria was suppressed to 10 % and 40 %, respectively. The suppression of the growth of two Candida species was also strong (10 % growth). However, growth parameters of three phytopathogenic fungi (Alternaria alternata, Botrytis cinerea and Fusarium culmorum) were less affected (75 % growth in comparison with the control). Attempts were made to characterize secondary metabolites isolated from T. atroviride O1. Known peptaibols, 20—21 amino acid long, but also shorter peptides, were detected by MALDI-TOF mass spectrometry. Thus, this study demonstrates the plant growth promotion, strong mycoparasitic potential and antimicrobial activity of the isolate T. atroviride O1, which could be in part ascribed to the production of secondary metabolites. This isolate does have a potential in the biocontrol in eco-farming. Further study, particularly, the identification of produced secondary metabolites, is needed.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46741791","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}

引用次数: 2

Sewage sludge as a source of triclosan-resistant bacteria 污水污泥是耐三氯生细菌的来源

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0006

Kristína Lépesová, Monika Krahulcová, T. Mackuľak, L. Bírošová

{"title":"Sewage sludge as a source of triclosan-resistant bacteria","authors":"Kristína Lépesová, Monika Krahulcová, T. Mackuľak, L. Bírošová","doi":"10.2478/acs-2019-0006","DOIUrl":"https://doi.org/10.2478/acs-2019-0006","url":null,"abstract":"Abstract Subinhibitory concentrations of antibiotics and biocides in wastewaters and sewage sludge have a great impact on the development of antibiotic resistance and its spread among bacteria. The aim of this work was to determine the occurrence of coliform bacteria and enterococci resistant to biocide triclosan in samples of sewage sludge. Subsequently, isolated strains of coliform bacteria were identified and characterized in terms of their antibiotic susceptibility and ability to form a biofilm. Occurrence of the studied bacteria was monitored in three samples of stabilized sludge from three different wastewater treatment plants (Vrakuňa, Petržalka, and Senec). The number of triclosan-resistant coliforms was the highest in the sludge sample from the wastewater treatment plant in Senec and the lowest in the sludge sample from the wastewater treatment plant in Petržalka. Triclosan-resistant Enterococcus spp. were not found in any sample of stabilized sludge. Most isolates were identified as Citrobacter freundii and Serratia spp. Triclosan-resistant isolates showed also resistance to antibiotics and the majority of them were strong biofilm producers.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42838674","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}

引用次数: 4

Analysis of C3 fraction splitting system performance by mathematical modeling in MATLAB environment MATLAB环境下C3馏分裂解系统性能的数学建模分析

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0018

Miroslav Variny, Patrik Furda, N. Kováč, O. Mierka

引用次数: 2

Use of zeolites for macronutrients removal from wastewater 沸石在去除废水中大量营养物质中的应用

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0021

B. Urminská, J. Derco, Ronald Zakhar, Adriana Korpicsová

引用次数: 4

Magnetic composites based on NR and strontium ferrite 基于NR和铁氧体锶的磁性复合材料

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Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0010

J. Kruželák, Andrea Kvasničáková, R. Dosoudil, I. Hudeč

{"title":"Magnetic composites based on NR and strontium ferrite","authors":"J. Kruželák, Andrea Kvasničáková, R. Dosoudil, I. Hudeč","doi":"10.2478/acs-2019-0010","DOIUrl":"https://doi.org/10.2478/acs-2019-0010","url":null,"abstract":"Abstract Two types of composites based on natural rubber (NR) and strontium ferrite were tested in this study. Composites of the first type were prepared by incorporation of strontium ferrite in the concentration range ranging from 0 to 100 phr (parts per hundred rubber) into pure NR based rubber matrix, while with those of the second type, strontium ferrite was dosed in the same concentration level into NR based rubber batch with constant amount of carbon black — 25 phr. For rubber matrices cross-linking, a standard sulfur based curing system was used. This work is focused on the effect of magnetic filler content on physico-mechanical, magnetic and thermo-physical properties of composite materials. Subsequently, the cross-link density and the structure of the formed sulfidic cross-links were examined. The results showed that the cross-link density of both types of composites increased with the increasing content of magnetic filler, while the structure of the sulfidic cross-links was almost not influenced by the amount of strontium ferrite. Tensile strength of rubber composites with pure rubber matrix was slightly improved by the incorporation of ferrite, while in case of composites based on a carbon black batch, the incorporation of magnetic filler resulted in the decrease of this characteristic. The presence of magnetic filler in both types of composites leads to a significant increase of the remanent magnetic induction.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46289012","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}

引用次数: 1