Publikační činnost Katedry environmentálního inženýrství / Publications of Department of Environmental Engineering (546)

Permanent URI for this collectionhttp://hdl.handle.net/10084/64794

Kolekce obsahuje bibliografické záznamy publikační činnosti (článků) akademických pracovníků Katedry environmentálního inženýrství (546) v časopisech registrovaných ve Web of Science od roku 2003 po současnost.
Do kolekce jsou zařazeny:
a) publikace, u nichž je v originálních dokumentech jako působiště autora (adresa) uvedena Vysoká škola báňská-Technická univerzita Ostrava (VŠB-TUO),
b) publikace, u nichž v originálních dokumentech není v adrese VŠB-TUO uvedena, ale autoři prokazatelně v době jejich zpracování a uveřejnění působili na VŠB-TUO.

Bibliografické záznamy byly původně vytvořeny v kolekci Publikační činnost akademických pracovníků VŠB-TUO, která sleduje publikování akademických pracovníků od roku 1990.

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Now showing 1 - 20 out of 242 results

Energy recovery from sewage sludge waste blends: Detailed characteristics of pyrolytic oil and gas
(Elsevier, 2024) Janáková, Iva; Malíková, Petra; Drabinová, Silvie; Kašpárková, Alena; Motyka, Oldřich; Smelík, Roman; Brožová, Kateřina; Heviánková, Silvie
Using waste as an alternative energy source may partially replace fossil fuels. In this paper, energy recovery from waste blends (sewage sludge (SS), polyethylene (LDPE) and polypropylene (PP), paper rejects (PR), and waste tyres) was tested through laboratory-scale co-pyrolysis. For each copyrolysis test, 7 l of waste blend in different ratios were used. The results of pyrolytic oil and gas analyses show valuable compounds and chemical materials recovered. The detailed analyses show the effects of co-pyrolysis parameters, especially the ratios of waste blends with respect to the process temperature of 600 degrees C, on the pyrolytic gas and oil. The highest volumes of gas (0.66 m3) and oil (699 ml) were obtained from sample 5_8 (PES:SS:PR). Waste blend 15_1 (LDPE:SS) had the highest gross calorific value (GCV) of 43.82 MJ/m3 in gas, and had the highest proportion of flammable components (46.31% of methane). Sample 5_8 had the highest calorific value in pyrolytic oil (45 MJ/kg) and sample 5_3 had the lowest (28.113 MJ/kg), which is comparable to coal. High-quality pyrolytic gas and oil were obtained with average GCV of 44 MJ/m3 and 40 MJ/kg respectively, where the average GCV of the most calorific fossil fuels is 43.6 MJ/kg in crude oil and 34 MJ/m3 in natural gas. We conclude that co-pyrolysis of sewage sludge and waste is a convenient and simple method of waste disposal under a synergetic effect of efficient waste management, energy production, and reduction of dependence on fossil fuels.
Pyrolysis of specific non-recyclable waste materials: Energy recovery and detailed product characteristics
(MDPI, 2024) Janáková, Iva; Čech, Martin; Grabovská, Šárka; Šigut, Oldřich; Sala, Pavel; Kijo-Kleczkowska, Agnieszka
This study explores the pyrolysis process applied to various non-utilized waste materials, specifically focusing on separated plastics from municipal waste, wood waste (including pallets and window frames), paper rejects, and automotive carpets. Different combinations of these waste materials were subjected to pyrolysis, a process involving high-temperature treatment (600 ◦C) in a nitrogen atmosphere. The resulting products, including biochar, gas, and liquid fractions, as well as the residual waste materials, underwent comprehensive analysis. The evaluation of pyrolysis products emphasizes their quality, energy content, and potential applications. Notably, the pyrolysis gas derived from the combination of separated municipal plastics and waste wood exhibited the highest calorific value at 49.45 MJ/m3 . Additionally, Mixture 2, consisting of plastic and wood waste, demonstrated the highest calorific value for the pyrolysis condensate, reaching 30.62 MJ/kg. Moreover, Mixture 3, benefiting from biochar utilization as a sorbent, displayed the highest iodine value at 90.01 mg/g.
Bioleaching of mine tailings by mesophilic: Acidithiobacillus spp., Leptospirillum ferrooxidans, and thermophilic: Sulfobacillus thermosulfidooxidans cultures with the addition of Ag+ additive
(MDPI, 2024) Rouchalová, Dana; Rouchalová, Kamila; Čablík, Vladimír
This research focused on applying and comparing the performance of microorganisms with different temperature preferences, assessing the overall percentage recovery of elements (copper, zinc, arsenic, and iron) from mine tailings in the Star & eacute; Ransko region (Czech Republic). The study examined the solubilisation process using a mesophilic mixed bacterial culture, including Acidithiobacillus ferrooxidans (AF), Acidithiobacillus thiooxidans (AT), Leptospirillum ferrooxidans (LF), and the thermophilic species Sulfobacillus thermosulfidooxidans (ST). Under biotic conditions, constant process parameters were maintained, including a particle size of 71-100 mu m, a pH value of 1.8, agitation at 150 rpm, and a pulp density of 10% (w/v). The only exception was the temperature, which varied for optimal multiplication of cultures (30 degrees C/50 degrees C). Additionally, the research examined the impact of AgNO3 additive at a concentration of Ag+ ions of 5 mgL-1. The research focused on the solubilisation of Cu, Zn, Fe, and As and the results demonstrated that the application of microorganisms ST, combined with the action of Ag+ ions, enhanced the kinetics of the extraction process, leading to the highest final recovery of all elements (Cu 91.93%, Zn 85.67%, As 69.16%, and Fe 71.72%) under the specified conditions. The study observed that the most significant increase in solubilisation can be attributed to the additive cation in the case of copper (AF, AT, LF/Ag+ by 40.33%; ST/Ag+ by 44.39%) and arsenic (AF, AT, LF/Ag+ by 23.79%; ST/Ag+ by 26.08%). Notably, the intensification of leaching using thermophilic bacteria at a constant suspension temperature of 50 degrees C was primarily determined for Zn (ST by 18.36%, ST/Ag+ by 14.24%). After 24 days of extraction, the emergence of secondary minerals, namely CaSO42H(2)O and KFe3(SO4)(2)(OH)(6), was identified. The study highlighted a significant increase in the extraction mechanism kinetics due to the influence of microorganisms, contrasting with the low solubilities observed under abiotic conditions (Cu 9.00%, Zn 14.17%, As 4.28%, Fe 6.23%).
Variability in the distinctive features of silica sands in Central Europe
(MDPI, 2024) Bašistová, Martina; Vontorová, Jiřina; Zlá, Simona; Kawuloková, Monika; Lichý, Petr; Dvorský, Tomáš
Quality quartz sand is globally utilized in construction due to its availability and economic factors, especially in the production of composite cements. Despite its positive properties, quartz sand also has several disadvantages. The dilation of quartz sand can be technologically significant for certain high-temperature applications. This dilation has a non-continuous character with sharp volume change caused by the phase transformation from beta to alpha SiO2 at temperatures around 573 degrees C. The extent of dilation depends on various factors such as compaction, grain size, the quantity of sand, as well as the shape and character of the grain and chemical purity, particularly the SiO2 content. In this study, six types of quartz sand from different locations in Central Europe were examined, and the influence of chemical composition and grain shape was correlated with the final dilation of these samples. Evaluation methods included X-ray fluorescence spectroscopy (XRFS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), differential thermal analysis (DTA), and linear thermal expansion analysis. It was found that angular grains, despite their chemical purity, may exhibit minimal dilation. Conversely, the least suitable combination in terms of dilation appears to be a high SiO2 content and high roundness of grains with a smooth surface.
Microwave-assisted hydrothermal synthesis of pure-phase sodalite (>99 wt.%) in suspension: Methodology design and verification
(MDPI, 2024) Rouchalová, Kamila; Rouchalová, Dana; Čablík, Vladimír; Matýsek, Dalibor
Despite numerous studies focused on the hydrothermal (HT) synthesis of fly ash zeolites (FAZs), this method still has many limitations, the main of which is the low yield of zeolites. Hydrothermally synthesized zeolites are typically multiphase and exhibit low purity, which limits their applicability. Pure-phase zeolites have been primarily prepared from filtrates after alkaline mineralization of fly ashes, not directly in suspension. In addition, the published methodologies have not been tested in a wider set of samples, and thus their reproducibility is not confirmed. The aim of the study is to propose a reproducible methodology that overcomes the mentioned limitations. The influence of the Si/Al ratio (1.3:1–1:2), the type and concentration of the activator (2/4 M NaOH/KOH/LiOH), the reagent (30% LiCl), the duration (24–168 h), and the temperature (50–180 °C) of the synthesis phases were studied. The sequence of the synthesis phases was also optimized, depending on the type of heat transfer. The fly ashes were analyzed by wavelength-dispersive X-ray fluorescence (WD XRF), flame atomic absorption spectrometry (F-AAS), and X-ray diffraction (XRD). The energy intensity of the synthesis was reduced through the application of unique microwave digestion technology. Both microwave and combined (microwave and convection) syntheses were conducted. FAZs were identified and quantified by XRD analysis. This study presents a three-stage (TS) hydrothermal synthesis of pure-phase sodalite in suspension. Sodalite (>99 wt.%) was prepared from nine fly ashes under the following conditions: I. microwave phase: 120 °C, 150 min, solid-to-liquid ratio (S/L) 1:5, Si/Al ratio 1:1.5, and 4 M NaOH; II. convection phase: 120 °C, 24 h, S/L 1:40, and the addition of 30 mL of 30% LiCl; and III. crystallization: 70 °C for 24 h. The formation of rhombododecahedral sodalite crystals was confirmed by scanning electron microscope (SEM) images.
Microbiota diversity in non-small cell lung cancer gut and mouth cavity microbiota diversity in non-small cell lung cancer patients
(Polskie Towarzystwo Mikrobiologów, 2023) Brisudová, Aneta; Bielniková-Kryštofová, Hana; Motyka, Oldřich; Fritzová, Dominika; Katuchová, Vladimíra; Ponikelská, Natálie; Skanderová, Daniela; Raclavský, Vladislav; Michálek, Jaroslav; Mitták, Marcel; Švecová, Petra; Jakubec, Petr; Rozsivalová, Denisa; Szkorupa, Marek; Klein, Jiří; Škarda, Jozef; Kolář, Zdeněk; Skopelidou, Valeria
Lung malignancies have a substantial impact on cancer incidence and mortality worldwide. Even though many factors involved in the development of the disease are known, many questions remain unanswered. Previous studies suggest that the intestinal microbiota may have a role in developing malignant diseases. According to some findings, the microbiota has proven to be a key modulator of carcinogenic processes and the immune response against cancer cells, potentially influencing the effectiveness of immunotherapy. In our study, we characterized culturable microorganisms associated with non-small cell lung cancer (NSCLC) that can be recovered from rectal swabs and mouthwash. In addition, we also explored differences in the culturable microbiota with two main types of NSCLC - adenocarcinoma (ADC) and squamous cell carcinoma (SCC). With 141 patients included in the study (86 ADC and 55 SCC cases), a significant difference was observed between the two types in seven bacterial species (Collinsella, Corynebacterium, Klebsiella, Lactobacillus, Neisseria, Rothia, and Streptococcus), including the site of origin. The relationship between microbial dysbiosis and lung cancer is poorly understood; future research could shed light on the links between gut microbiota and lung cancer development.
Akademické psaní a frázové banky
(Ústav pro jazyk český AV ČR, v. v. i., 2023) Homoláč, Jiří; Křen, Michal; Kašpárková, Alena; Etchegoyen Rosolová, Kamila; Hoffmannová, Jana; Kaderka, Petr; Kopecký, Jakub; Sherman, Tamah; Vondřička, Pavel
Enhancing oral squamous cell carcinoma prediction: the prognostic power of the worst pattern of invasion and the limited impact of molecular resection margins
(Frontiers Media S.A., 2023) Hurník, Pavel; Režnarová, Jana; Chyra, Zuzana; Motyka, Oldřich; Moldovan Putnová, Barbora; Čermáková, Zuzana; Blažek, Tomáš; Fománek, Martin; Gaykalova, Daria; Buchtová, Marcela; Ševčíková, Tereza; Štembírek, Jan
Objective: Oral squamous cell carcinoma (OSCC) originates from the mucosal lining of the oral cavity. Almost half of newly diagnosed cases are classified as advanced stage IV disease, which makes resection difficult. In this study, we investigated the pathological features and mutation profiles of tumor margins in OSCC. Methods: We performed hierarchical clustering of principal components to identify distinct patterns of tumor growth and their association with patient prognosis. We also used next-generation sequencing to analyze somatic mutations in tumor and marginal tissue samples. Results: Our analyses uncovered that the grade of worst pattern of invasion (WPOI) is strongly associated with depth of invasion and patient survival in multivariable analysis. Mutations were primarily detected in the DNA isolated from tumors, but several mutations were also identified in marginal tissue. In total, we uncovered 29 mutated genes, mainly tumor suppressor genes involved in DNA repair including BRCA genes; however none of these mutations significantly correlated with a higher chance of relapse in our medium-size cohort. Some resection margins that appeared histologically normal harbored tumorigenic mutations in TP53 and CDKN2A genes. Conclusion: Even histologically normal margins may contain molecular alterations that are not detectable by conventional histopathological methods, but NCCN classification system still outperforms other methods in the prediction of the probability of disease relapse.
Immunohistochemical evaluation of tissues following bone implant extraction from upper and lower limb
(Universidad de Murcia, 2023) Bielniková-Kryštofová, Hana; Motyka, Oldřich; Židlík, Vladimír; Žiak, Dušan; Szotkovská, Iveta; Škarda, Jozef; Voves, Jiří; Pometlová, Jana; Pleva, Leopold; Havlíček, Miroslav; Čabanová, Kristina
Fractured bones can regenerate and restore their biological and mechanical properties to the state prior to the damage. In some cases, however, the treatment of fractures requires the use of supportive implants. For bone healing, three processes are essential: the inflammatory phase, the repair phase and the remodelling phase. A proper course of the first inflammatory stage is important to ensure a successful fracture healing process. In our study, we evaluated tissue samples immunohistochemically from the area surrounding the fractures of upper and lower limbs (bone tissue, soft tissue, and the implant-adhering tissue) for markers: CD11b, CD15, CD34, CD44, CD68, Cathepsin K, and TRAcP that are linked to the aforementioned phases. In soft tissue, higher expressions of CD68, CD34, CD15 and CD11b markers were observed than in other locations. TRAcP and Cathepsin K markers were more expressed in the bone tissue, while pigmentation, necrosis and calcification were more observed in the implant-adhering tissue. Since even the implant materials commonly perceived as inert elicit the observed inflammatory responses, new surface treatments and materials need to be developed.
Reclamation and revitalization of post-mining sites - ups and downs
(Technická univerzita Košice, Fakulta baníctva, ekológie, riadenia a geotechnológií, 2023) Biegańska, Jolanta; Tora, Barbara; Sinka, Tomasz; Čablík, Vladimír; Hlavatá, Miluše
During the post-mining activities, all the forms of environment degradation are observed. This article refers to the projects of reclamation and revitalization of post-mining sites. The method of studying reclamation project documents was used to evaluate remedial actions. This allows for a comparative analysis of the obtained effects (the analyzed case) with the planned procedures. It has been shown what the main effects of degradation are caused by surface and underground mining, as well as what procedures are in force for the repair processes (recultivation and revitalization).
Aerobic release of arsenic and antimony from mine soils by biostimulation of indigenous microbial activity and bioaugmentation with Cupriavidus genera of bacteria
(Springer Nature, 2023) Horváthová, Hana; Schwarzkopfová, Katarína; Vojtková, Hana; Jurkovič, Ľubomír; Faragó, Tomáš; Boturová, Kateřina; Hiller, Edgar; Urík, Martin; Vítková, Martina
Background and Aims Bioremediation of soils contaminated with metal(loid)s is an attractive research area due to its sustainability and economic benefits. In the Slovak Republic, there are several abandoned mines containing high concentrations of arsenic (As) and antimony (Sb). This calls for new options for removing these hazardous metalloids from contaminated substrates. Studies on bioleaching of soils co-contaminated with both metalloids are very rare. This study aimed to test the effectiveness of bioleaching of soils heavily co-contaminated with As and Sb (up to 1463 mg.kg–1 and 5825 mg.kg–1, respectively) at a former stibnite mining site (Poproč, eastern Slovakia) through biostimulation and bioaugmentation. Methods Bioleaching of As and Sb from four soils was induced by biostimulation of autochthonous microflora with Sabouraud medium (SAB) and SAB+glucose, and bioaugmentation of the soil with bacterial strains Cupriavidus oxalaticus and Cupriavidus metallidurans. Soil samples were subjected to determination of physico-chemical properties, microbiological parameters, and additional mineralogical analysis. Results An inverse relationship between the total metalloid concentration and the microbial diversity was confirmed. In experiments with Cupriavidus metallidurans and Cupriavidus oxalaticus, mean bioleached As fractions were 37.6% and 41.3%, while Sb bioleaching was significantly lower, ranging between 17.0–26.2%. The mean bioleached fraction of As and Sb using SAB was 40.7% and 14.4%, respectively. The addition of glucose to SAB increased As bioleaching (50.7%) but not that of Sb. Conclusion Collectively, the results highlighted a role of microorganisms in the mobility of metalloids in soils with their prospective applications in remediation of contaminated sites.
Microbial involvement in iodine cycle: mechanisms and potential applications
(Frontiers Media S.A., 2023) Duborská, Eva; Vojtková, Hana; Matulová, Michaela; Šeda, Martin; Matúš, Peter
Stable iodine isotopes are essential for humans as they are necessary for producing thyroid gland hormones. However, there are hazardous radioactive iodine isotopes that are emitted into the environment through radioactive waste generated by nuclear power plants, nuclear weapon tests, and medical practice. Due to the biophilic character of iodine radionuclides and their enormous biomagnification potential, their elimination from contaminated environments is essential to prevent the spread of radioactive pollution in ecosystems. Since microorganisms play a vital role in controlling iodine cycling and fate in the environment, they also can be efficiently utilized in solving the issue of contamination spread. Thus, this paper summarizes all known on microbial processes that are involved in iodine transformation to highlight their prospects in remediation of the sites contaminated with radioactive iodine isotopes.
Simple method for quantification of metal-based particles in biopsy samples of patients with long bone implants – Pilot study
(Elsevier, 2023) Olšovská, Eva; Čabanová, Kristina; Motyka, Oldřich; Bielniková Kryštofová, Hana; Matějková, Petra; Voves, Jiří; Židlík, Vladimír; Madeja, Roman; Demel, Jiří; Halfar, Jan; Kukutschová, Jana
The presence of particles fixed in tissue samples due to implant degradation or disintegration plays an important role in post-operative complications. The ability to determine the size, shape, chemical composition and, above all, the number of these particles can be used in many areas of medicine. This study presents a novel, simple metal-based particle detection method using scanning electron microscopy with energy dispersive spectrometer (SEM-EDS). The presence of metal particles in biopsy specimens from long bone nail-fixated implants (10 patients with titanium steel nails and 10 patients with stainless steel nails) was studied. The samples were analysed using automated area analysis based on image binarization and brightness to 255 grayscale. The results were supplemented with histological data and statistically analysed. The method based on the software used was found to be accurate and easy to use and, thus, appears to be very suitable for particle detection in similar samples.
The first evidence of microplastic occurrence in mine water: The largest black coal mining area in the Czech Republic
(Elsevier, 2023) Brožová, Kateřina; Halfar, Jan; Čabanová, Kristina; Motyka, Oldřich; Drabinová, Silvie; Hanus, Pavel; Heviánková, Silvie
Climate change is creating new challenges for water supply worldwide, making the search for new sources of water vital. As mine water could serve as a potential source, this study investigated the presence of microplastics in water from terminated deep mines in the largest coal basin in the Czech Republic, as well as in water from nearby shallow wells. The particles found were analyzed for size, polymer composition, color and morphology using the ImageJ tool, infrared spectroscopy with Fourier transform (FTIR) and an optical stereomicroscope with a digital camera. Microplastics were detected in all tested sites. Their range accounted for 2.5–17.5 items/L for mine water samples and 2.5–20 items/L for well samples, with fibers being the dominant type. The average width of particles from mine water and wells amounted to 58 µm; 71 µm, length to 655 µm; 501 µm and area to 22,067 µm2; 28,613 µm2, respectively. Blue color was prevalent, among materials, in both cases, plastic coated paper was found dominant to Polyethylene terephthalate (PET), Polyester (PES), Tetrafluoroethylene-perfluoro (Propyl Vinyl Ether) - Copolymer (TFE-PPVE), and polypropylene (PP). The research provides the first evidence of microplastics’ presence in underground waters from deep mines and shallow wells in the same area. The data suggest that it is almost impossible to find underground water sources free of microplastic contamination. In this context, atmospheric contamination from mine ventilation and infiltration through terminated mines were identified as potential sources, while infiltration through soil and rock formations is unlikely given the geological composition. The results of this study can serve as a relevant basis for further research on microplastics in mine waters. Additionally, the conclusions can advance the development in remediation technologies of microplastics from deep underground waters and their implementation in practice, particularly in light of upcoming legislation.
Phytoremediation proficiency of Jatropha gossypifolia under the influence of Pseudomonas aeruginosa on metal contaminated soil
(Elsevier, 2023) Chi, Nguyen Thuy Lan; Huong, Dinh Thi Thu; Dao, Phan; Lapčík, Vladimír
This investigation was performed to evaluate the metal pollution and possible phytoremediation on bauxite mine surrounding farmland soil. The quality analysis results revealed that, the soil has been polluted with metals such as Al (13.25 ± 0.54 mg kg−1), Pb (336.18 ± 7.17 mg kg−1), Zn (382.18 ± 3.05 mg kg−1), and Cd (11.32 ± 0.28 mg kg−1) and possess poor essential element content. The test bacterium Pseudomonas aeroginosa showed considerable metal tolerance up to 100 mg kg−1 concentration of metals such as Al, Pb, Zn, and Cd. Besides that, it also possesses essential plant growth promoting traits such as sederophore, IAA, nitrogen fixation, and phosphate solubilization. The test bacterium P. aeroginosa demonstrated optimistic influence on the growth and phytoremediation ability of Jatropha gossypifolia on metal-polluted soil under greenhouse experiment with different treatment groups (I–V). Group I (J. gossypifolia seeds coated with P. aeroginosa) showed outstanding phytoremediation potential on metal polluted soil than other treatment groups. The group I reduced considerable quantity of metals (Al 42.79%, Pb 36.57%, Zn 47.06%, and Cd 39.57%) from the treated soil. It was significantly higher than the remediation potential of other treatment groups (II–V). These findings suggest that P. aeroginosa's metal tolerant and PGP characters can effectively influence the growth and phytoremediation potential of J. gossypifolia on metal polluted soil.
The use of construction waste to remediate a thermally active spoil heap
(MDPI, 2023) Pertile, Eva; Dvorský, Tomáš; Václavík, Vojtěch; Syrová, Lucie; Charvát, Jakub; Máčalová, Kateřina; Balcařík, Lukáš
This article presents the results of experimental research on the possible use of construction and demolition waste (CDW) to improve the properties of unburnt tailings originating from the thermally active spoil heap in Heˇrmanice (Ostrava, Czech Republic). Mining activity anywhere in the world generally entails a lot of negative impacts on the environment, which are of a long-term nature. One of the most pressing challenges in the remediation of the consequences of mining activity is the thermal activity of spoil heaps associated with the high acidity of the tailings. Active acidity (pH/H2O), exchangeable acidity (pH/CaCl2 ), hydrolytic acidity (Ha), and elemental composition of tailings and CDW have been monitored. Based on an acidity study, it has been proven that compared to burnt tailings (pH/H2O = 8.4, pH/CaCl2 = 8.9 and Ha = 1.4 mmol kg−1 ), unburnt tailings show acidic properties (pH/H2O = 3.7, pH/CaCl2 = 3.6 and Ha = 205 mmol kg−1 ). The bioavailability of two selected potentially toxic elements (PTEs), namely Al and Fe, was examined based on the elemental composition. BCR sequential extraction analysis was used to determine their bioavailability. It has been proven that mixing CDW with tailings has a positive effect on the pH value, which has a positive effect on the further development of the entire site. The increase in the pH value is provably dependent on the amount of construction waste added, so it can be said that the increasing amount of construction waste will result in improved parameters of the burnt tailings. The results of the BCR analysis show that aluminum from the tailings will be released both from the reducible and oxidisable fractions, where it will be mainly bound to sulphides. The relatively high concentration of Fe in the oxidisable fraction (2002 mg Fe kg−1 ) suggests that Fe is bound to sulphides in the tailings, and it is due to the high residual pyrite and sulphide content in the dumped material, as expected. This work has found no limits where CDW no longer positively affects the acidity of unburnt tailings. For practical application, however, it is important that the mixture of CDW and tailings is properly mixed and then used for remediation.
Biosorption potential of viable and dead Aspergillus flavus biomass on polluted pond water
(Elsevier, 2023) Chi, Nguyen Thuy Lan; Huong, Dinh Thi Thu; Dao, Phan; Lapčík, Vladimír
The State Industries Promotion Corporation of Tamil Nadu Ltd (SIPCOT) Lake is never dry; it is always full of water and was recently used as a waste reservoir by the native peoples and industrialists. Thus, this investigation was performed to assess the quality of the lake water and evaluate the possible biosorption potential of Aspergillus flavus on this lake water sample through batch model biosorption study. The water quality parameters analyses revealed that the lake water has been polluted with number of contaminates which including organic and inorganic. The most of the parameters such as pH (9.5 ± 0.7), turbidity (38 ± 1.1 NT unit), TDS (2350.12 ± 31.24 mg L−1), BOD (40.21 ± 3.27 mg L−1), and COD (278.61 ± 11.84 mg L−1), Ca (212.85 ± 9.64 mg L−1), Fe (3.1 ± 0.8 mg L−1), NH3 (15.62 ± 0.5 mg L−1), NO3-(5.84 ± 0.14 mg L−1), Cl− (1257.85 ± 4.6 mg L−1),Cd (15.64 ± 0.29 mg L−1), Cr (6.86 ± 0.34 mg L−1), Pb (25.61 ± 3.41 mg L−1), and Hg (1.8 ± 0.024 mg L−1) content of water sample were beyond the acceptable limits. Fortunately, the A. flavus dead biomass showed considerable biosorption potential (Cd: 27.5 ± 1.1%, Cr: 13.48 ± 1.2%, Pb: 21.27 ± 1.5%, and Hg: 6.49 ± 0.86% in 180 min of contact time) than viable form on polluted lake water. Since, reduced the quantities of most of the parameters which beyond the permissible limit and also increased remarkable percentage of DO in the water sample in a short period of contact time. These findings suggest that A. flavus dead biomass can be used for bioremediation of polluted water in a sustainable manner.
Involvement of bacterial and fungal extracellular products in transformation of manganese-bearing minerals and its environmental impact
(MDPI, 2023) Farkas, Bence; Vojtková, Hana; Farkas, Zuzana; Pangallo, Domenico; Kašák, Peter; Lupini, Antonio; Kim, Hyunjung; Urík, Martin; Matúš, Peter
Manganese oxides are considered an essential component of natural geochemical barriers due to their redox and sorptive reactivity towards essential and potentially toxic trace elements. Despite the perception that they are in a relatively stable phase, microorganisms can actively alter the prevailing conditions in their microenvironment and initiate the dissolution of minerals, a process that is governed by various direct (enzymatic) or indirect mechanisms. Microorganisms are also capable of precipitating the bioavailable manganese ions via redox transformations into biogenic minerals, including manganese oxides (e.g., low-crystalline birnessite) or oxalates. Microbially mediated transformation influences the (bio)geochemistry of manganese and also the environmental chemistry of elements intimately associated with its oxides. Therefore, the biodeterioration of manganese bearing phases and the subsequent biologically induced precipitation of new biogenic minerals may inevitably and severely impact the environment. This review highlights and discusses the role of microbially induced or catalyzed processes that affect the transformation of manganese oxides in the environment as relevant to the function of geochemical barriers.
Type IV titanium hypersensitivity: rare, or rarely detected?
(Česká společnost pro ortopedii a traumatologii a Slovenská ortopedická a traumatologická spoločnosť, 2023) Voves, Jiří; Měrka, Ondřej; Čabanová, Kristina; Janošek, Jaroslav; Bajor, Grzegorz
The presented review aims to summarize the current knowledge of hypersensitivity to titanium – a material widely used in medical applications thanks to its exceptional chemical stability, resistance to corrosion, low specific weight and high strength. The hypersensitivity to metals is usually caused by the Type IV immunopathological reaction. Case reports on allergic reactions to titanium are rare but the actual occurrence can be expected to be much higher, especially due to its problematic detection. Although cutaneous patch tests are widely accepted and used for the diagnosis of hypersensitivity of numerous metals (e.g. Ni), it is notoriously unreliable in case of allergies to titanium, which may be associated with the low percutaneous transport of titanium and its salts. The Lymphocyte Transformation Test has superior sensitivity but it remains mostly unknown among clinicians and there are not many laboratories capable of performing it. This review presents numerous case reports indicating, in combination with the above-mentioned facts, that hypersensitivity to titanium should be considered as a possible cause also in non-specific problems associated with titanium implant failure.
HPV and RAD51 as prognostic factors for survival in inoperable oral and oropharyngeal cancer in patients unfit for chemotherapy treated with hyperfractionated radiotherapy
(MDPI, 2023) Zděblová Čermáková, Zuzana; Hurník, Pavel; Konvalinka, David; Štembírek, Jan; Paračková, Tereza; Resová, Kamila; Cvek, Jakub; Blažek, Tomáš; Knybel, Lukáš; Formánek, Martin; Gachechiladze, Mariam; Joerger, Markus; Soltermann, Alex; Škarda, Jozef; Motyka, Oldřich; Janoutová, Jana
Introduction: The incidence of advanced oral cavity and oropharyngeal cancers is generally high. Treatment outcomes for patients, especially those unfit for comprehensive cancer treatment, are unsatisfactory. Therefore, the search for factors to predict response to treatment and increase overall survival is underway. Objective: This study aimed to analyze the presence of 32 HPV genotypes in tumor samples of 34 patients and the effect of HPV status and RAD51 on overall survival. Method: Tumor samples of 34 patients with locally advanced oropharyngeal or oral cavity cancer treated with accelerated radiotherapy in monotherapy were analyzed using reverse hybridization and immunohistochemistry for the presence of HPV and RAD51. Its effect on overall survival was examined. Results: Only two types of HPV were identified—HPV 16 (dominant) and HPV 66 (two samples). The HPV positivity was associated with a borderline insignificant improvement in 2-year (p = 0.083), 5-year (p = 0.159), and overall survival (p = 0.083). Similarly, the RAD51 overexpression was associated with borderline insignificant improvement in 2-year (p = 0.083) and 5-year (p = 0.159) survival. Conclusion: We found no statistically significant differences but detected trends toward improvement in the survival of HPV-positive and RAD51 overexpressing patients unfit for surgical treatment or chemotherapy treated with hyperfractionated radiotherapy. The trends, however, indicate that in a larger group of patients, the effects of these two parameters would likely be statistically significant.

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