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Mikula P, Hollerova A, Hodkovicova N, Doubkova V, Marsalek P, Franc A, Sedlackova L, Hesova R, Modra H, Svobodova Z, Blahova J. Long-term dietary exposure to the non-steroidal anti-inflammatory drugs diclofenac and ibuprofen can affect the physiology of common carp (Cyprinus carpio) on multiple levels, even at "environmentally relevant" concentrations. Sci Total Environ 2024; 917:170296. [PMID: 38301789 DOI: 10.1016/j.scitotenv.2024.170296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/15/2024] [Accepted: 01/18/2024] [Indexed: 02/03/2024]
Abstract
The aim of the study was to evaluate the effects of emerging environmental contaminants, the non-steroidal anti-inflammatory drugs (NSAIDs) diclofenac (DCF) and ibuprofen (IBP), on physiological functions in juvenile common carp (Cyprinus carpio). Fish were exposed for 6 weeks, and for the first time, NSAIDs were administered through diet. Either substance was tested at two concentrations, 20 or 2000 μg/kg, resulting in four different treatments (DCF 20, DCF 2000, IBP 20, IBP 2000). The effects on haematological and biochemical profiles, the biomarkers of oxidative stress, and endocrine disruption were studied, and changes in RNA transcription were also monitored to obtain a comprehensive picture of toxicity. Fish exposure to high concentrations of NSAIDs (DCF 2000, IBP 2000) elicited numerous statistically significant changes (p < 0.05) in the endpoints investigated, with DCF being almost always more efficient than IBP. Compared to control fish, a decrease in total leukocyte count attributed to relative lymphopenia was observed. Plasma concentrations of total proteins, ammonia, and thyroxine, and enzyme activities of alanine aminotransferase (ALT), aspartate aminotransferase, and alkaline phosphatase (ALP) were significantly elevated in either group, as were the activities of certain hepatic antioxidant enzymes (superoxide dismutase, glutathione-S-transferase) in the DCF 2000 group. The transcriptomic profile of selected genes in the tissues of exposed fish was affected as well. Significant changes in plasma total proteins, ammonia, ALT, and ALP, as well as in the transcription of genes related to thyroid function and the antioxidant defense of the organism, were found even in fish exposed to the lower DCF concentration (DCF 20). As it was chosen to match DCF concentrations commonly detected in aquatic invertebrates (i.e., the potential feed source of fish), it can be considered "environmentally relevant". Future research is necessary to shed more light on the dietary NSAID toxicity to fish.
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Affiliation(s)
- Premysl Mikula
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic
| | - Aneta Hollerova
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | - Nikola Hodkovicova
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | - Veronika Doubkova
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic
| | - Petr Marsalek
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic
| | - Ales Franc
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Lucie Sedlackova
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Renata Hesova
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic
| | - Helena Modra
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic; Department of Environmentalistics and Natural Resources, Faculty of Regional Development and International Studies, Mendel University in Brno, tr. Generala Piky 7, 613 00 Brno, Czech Republic
| | - Zdenka Svobodova
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic
| | - Jana Blahova
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Palackeho tr. 1946/1, Czech Republic.
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Hodkovicova N, Hollerova A, Blahova J, Mikula P, Crhanova M, Karasova D, Franc A, Pavlokova S, Mares J, Postulkova E, Tichy F, Marsalek P, Lanikova J, Faldyna M, Svobodova Z. Non-steroidal anti-inflammatory drugs caused an outbreak of inflammation and oxidative stress with changes in the gut microbiota in rainbow trout (Oncorhynchus mykiss). Sci Total Environ 2022; 849:157921. [PMID: 35952865 DOI: 10.1016/j.scitotenv.2022.157921] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/25/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
One of the main contributors to pharmaceutical pollution of surface waters are non-steroidal anti-inflammatory drugs (NSAIDs) that contaminate the food chain and affect non-target water species. As there are not many studies focusing on toxic effects of NSAIDs on freshwater fish species and specially effects after dietary exposure, we selected rainbow trout (Oncorhynchus mykiss) as the ideal model to examine the impact of two NSAIDs - diclofenac (DCF) and ibuprofen (IBP). The aim of our study was to test toxicity of environmentally relevant concentrations of these drugs together with exposure doses of 100× higher, including their mixture; and to deepen knowledge about the mechanism of toxicity of these drugs. This study revealed kidneys as the most affected organ with hyalinosis, an increase in oxidative stress markers, and changes in gene expression of heat shock protein 70 to be signs of renal toxicity. Furthermore, hepatotoxicity was confirmed by histopathological analysis (i.e. dystrophy, congestion, and inflammatory cell increase), change in biochemical markers, increase in heat shock protein 70 mRNA, and by oxidative stress analysis. The gills were locally deformed and showed signs of inflammatory processes and necrotic areas. Given the increase in oxidative stress markers and heat shock protein 70 mRNA, severe impairment of oxygen transport may be one of the toxic pathways of NSAIDs. Regarding the microbiota, an overgrowth of Gram-positive species was detected; in particular, significant dysbiosis in the Fusobacteria/Firmicutes ratio was observed. In conclusion, the changes observed after dietary exposure to NSAIDs can influence the organism homeostasis, induce ROS production, potentiate inflammations, and cause gut dysbiosis. Even the environmentally relevant concentration of NSAIDs pose a risk to the aquatic ecosystem as it changed O. mykiss health parameters and we assume that the toxicity of NSAIDs manifests itself at the level of mitochondria and proteins.
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Affiliation(s)
- N Hodkovicova
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Brno, Czech Republic.
| | - A Hollerova
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Brno, Czech Republic; Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
| | - J Blahova
- Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
| | - P Mikula
- Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
| | - M Crhanova
- Department of Microbiology and Antimicrobial Resistance, Veterinary Research Institute, Brno, Czech Republic
| | - D Karasova
- Department of Microbiology and Antimicrobial Resistance, Veterinary Research Institute, Brno, Czech Republic
| | - A Franc
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Masaryk University, Brno, Czech Republic
| | - S Pavlokova
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Masaryk University, Brno, Czech Republic
| | - J Mares
- Department of Zoology, Fisheries, Hydrobiology and Apiculture, Faculty of AgriSciences, Mendel University in Brno, Czech Republic
| | - E Postulkova
- Department of Zoology, Fisheries, Hydrobiology and Apiculture, Faculty of AgriSciences, Mendel University in Brno, Czech Republic
| | - F Tichy
- Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Veterinary Sciences, Brno, Czech Republic
| | - P Marsalek
- Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
| | - J Lanikova
- Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
| | - M Faldyna
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Brno, Czech Republic
| | - Z Svobodova
- Department of Animal Protection and Welfare & Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czech Republic
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Timkova V, Minarikova D, Katreniakova Z, Mikula P, Husivargova A, Nagyova I. Behavioral innovations in the management of obesity and overweight using the COM-B model. Eur J Public Health 2022. [DOI: 10.1093/eurpub/ckac131.352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Increasing overweight and obesity rates represent one of the global health challenges in the 21st century. Obesity is a gateway to many non-communicable diseases and shorter life expectancy. Understanding individual capability, opportunity, and motivation for health behavior change (COM-B) may help to develop effective public health interventions. However, so far, only a very few studies examined interventions based on behavior change theories. Thus, we aimed to assess the potential facilitators and barriers to behavior change in weight management using the COM-B model.
Methods
We included 146 people with overweight and obesity (66.7% female; mean age 46.62±14.51 years; body mass index 32.46±6.51 kg/m2) from primary care settings. All participants completed the Brief Measure of Behavior Change (COM-B), the General Self-Efficacy Scale (GSE), the Rosenberg Self-esteem Scale (RSE), and the Self-Rated Heath scale (SRH). Multiple linear regression analyses were used to analyze the data.
Results
In univariate analyses COM-B domains were positively associated with female gender, living with a partner, lower body mass index, and higher SRH. However, the associations between sociodemographic and clinical variables and COM-B domains were no longer significant when self-esteem and general self-efficacy were added to the multivariate regression models. Self-efficacy was associated with reflective motivation (β: 0.53; p < 0.001), physical capability (β: 0.43; p < 0.001), and psychological capability (β: 0.44; p < 0.001) the most significantly. Self-esteem was strongly associated with physical capability (β: 0.41; p < 0.01). Total explained variances in the final models varied from 17.7% to 25.0%.
Conclusions
Personal resources may play a significant role in weight management and should be included in tailored public health interventions (Grant support: VEGA: 1/0748/22).
Key messages
• Interventions focused on the enhancement of personal resources may improve weight management.
• Behavioral and cultural aspects should be considered when designing effective public health interventions.
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Affiliation(s)
- V Timkova
- Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Košice, Slovakia
| | - D Minarikova
- Organisation and Management of Pharmacy, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Z Katreniakova
- Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Košice, Slovakia
| | - P Mikula
- Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Košice, Slovakia
| | - A Husivargova
- Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Košice, Slovakia
| | - I Nagyova
- Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Košice, Slovakia
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Ondriska F, Soják Ľ, Boldiš V, Piesecká Ľ, Mikula P, Kováč Ľ. Unusual Toxoplasma infection of the eye and central nervous system in an HIV-positive patient. Epidemiol Mikrobiol Imunol 2022; 71:165-170. [PMID: 36257796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
OBJECTIVE To report on a unique combination of cerebral toxoplasmosis and ocular toxoplasmosis in an HIV-positive patient in Slovakia. METHODS A 35-year-old heterosexual patient who presented with headache and major seizures underwent computed tomography (CT) and magnetic resonance imaging (MRI). Based on clinical findings, serological tests for toxoplasmosis were performed on serum and ocular fluid specimens. PCR was also used to detect Toxoplasma gondii and cytomegalovirus DNA. Goldmann and Witmer coefficient calculation was applied to demonstrate the synthesis of intraocular IgG antibodies. RESULTS CT and MRI revealed cystic lesions suspected of metastasis in the occipital and temporal regions, and we searched for the primary tumor. After vision loss in the left eye, which rapidly progressed to complete blindness, an eye examination detected macular edema. Anti-edema treatment was initiated. HIV positivity with a very low CD4 T-cell count (20/μL) was found, and the viral load was 100 400 HIV-RNA copies/ml. The serum was positive for anti-Toxoplasma IgG antibodies (> 200 IU/mL), IgM negative, and IgA borderline. As toxoplasmic encephalitis and retinitis were suspected, antitoxoplasmic therapy with pyrimethamine, spiramycin, and folinic acid was started. The ophthalmologist considered cytomegalovirus retinitis, which was not confirmed by serology or PCR. In contrast, the presence of IgG antibodies in ocular fluid and serum with the calculation of the Goldmann-Witmer coefficient (GW = 32) as well as PCR DNA positivity pointed to Toxoplasma gondii as the etiological agent. Follow-up MRI scan confirmed regression of the pathological lesions, neurological deficit also improved, CD4 T-lymphocytes increased above 200/μL, but blindness of the left eye persisted. CONCLUSION CT and MRI scans offered no clue as to Toxoplasma etiology of the brain and eye involvement in an HIV-positive patient, which was only confirmed by laboratory tests. Due to the delay in the diagnosis of toxoplasmosis, time from the epileptic seizure to treatment initiation was 16 days, which assumedly caused irreversible blindness in the patient.
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Novotna K, Svobodova Z, Harustiakova D, Mikula P. Spatial and Temporal Trends in Contamination of the Czech Part of the Elbe River by Mercury Between 1991 and 2016. Bull Environ Contam Toxicol 2020; 105:750-757. [PMID: 32970223 DOI: 10.1007/s00128-020-03005-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
We summarized available data concerning contamination of the Czech part of the Elbe River by mercury and assessed the potential risks to humans connected with the consumption of contaminated fish. Total mercury concentrations were evaluated in dorsal muscle of chub (Squalius cephalus) and bream (Abramis brama) that were collected at 11 sampling sites in the period from 1991 to 2016. Significant differences among sites were found for both species. The highest contamination was observed near the non-ferrous Kovohute metal works at Celakovice and also downstream from the Spolana chemical plant at Neratovice. A significant decline in contamination with time (concentrations decreasing from 1.65 to 0.22 mg kg-1; p = 0.004) was revealed in chub downstream from the Spolana plant. Calculated hazard indices (HIs) were below 1, therefore, adverse health effects on the general Czech population connected with the consumption of fish from the Elbe River were not expected.
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Affiliation(s)
- Kamila Novotna
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Zdenka Svobodova
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Danka Harustiakova
- RECETOX, Faculty of Science, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic
- Institute of Biostatistics and Analyses, Faculty of Medicine, Masaryk University, Kamenice 126/3, 625 00, Brno, Czech Republic
| | - Premysl Mikula
- Department of Animal Protection and Welfare and Veterinary Public Health, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic.
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Hodkovicova N, Sehonova P, Blahova J, Faldyna M, Marsalek P, Mikula P, Chloupek P, Dobsikova R, Vecerek V, Vicenova M, Vosmerova P, Svobodova Z. The effect of the antidepressant venlafaxine on gene expression of biotransformation enzymes in zebrafish (Danio rerio) embryos. Environ Sci Pollut Res Int 2020; 27:1686-1696. [PMID: 31755053 DOI: 10.1007/s11356-019-06726-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 10/07/2019] [Indexed: 06/10/2023]
Abstract
The effect of venlafaxine, a pharmaceutical commonly found in aquatic environment, was analyzed on non-target organism, Danio rerio (Hamilton, 1822). D. rerio embryos were treated by two different concentrations of venlafaxine: either concentration relevant in aquatic environment (0.3 μg/L) or concentration that was two orders of magnitude higher (30 μg/L) for the evaluation of dose-dependent effect. Time-dependent effect was rated at 24, 96, and 144 h post-fertilization (hpf). For gene expression, genes representing one of the phases of xenobiotic biotransformation (0 to III) were selected. The results of this study showed that the effect of venlafaxine on the zebrafish embryos is the most evident at hatching (96 hpf). At this time, the results showed a downregulation of gene expression in each phase of biotransformation and in both tested concentrations. In contrast, an upregulation of most of the genes was observed 144 hpf for both tested venlafaxine concentrations. The study shows that venlafaxine can affect the gene expression of biotransformation enzymes in D. rerio embryos even in the environmentally relevant concentration and thus disrupt the process of biotransformation. Moreover, the pxr regulation of genes seems to be disrupted after venlafaxine exposure in dose- and time-dependent manner.
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Affiliation(s)
- Nikola Hodkovicova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic.
- Department of Immunology, Veterinary Research Institute, Hudcova 296/70, 621 00, Brno, Czech Republic.
| | - Pavla Sehonova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
- Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Jana Blahova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Martin Faldyna
- Department of Immunology, Veterinary Research Institute, Hudcova 296/70, 621 00, Brno, Czech Republic
| | - Petr Marsalek
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Premysl Mikula
- Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Petr Chloupek
- Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Radka Dobsikova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Vladimir Vecerek
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Monika Vicenova
- Department of Immunology, Veterinary Research Institute, Hudcova 296/70, 621 00, Brno, Czech Republic
| | - Petra Vosmerova
- Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
| | - Zdenka Svobodova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho tr. 1946/1, 612 42, Brno, Czech Republic
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Travnickova E, Mikula P, Oprsal J, Bohacova M, Kubac L, Kimmer D, Soukupova J, Bittner M. Resazurin assay for assessment of antimicrobial properties of electrospun nanofiber filtration membranes. AMB Express 2019; 9:183. [PMID: 31720875 PMCID: PMC6854189 DOI: 10.1186/s13568-019-0909-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 10/31/2019] [Indexed: 12/20/2022] Open
Abstract
We developed a simple and fast microplate assay for evaluation of the antimicrobial activity of electrospun nanofiber filtration membranes or similar porous materials for water treatment technologies. Resazurin (alamarBlue®) was used as an indicator of the amount of viable experimental microorganisms Gram-negative Escherichia coli, Gram-positive Enterococcus faecalis, and natural wastewater treatment plant effluent bacteria. A bacterial inoculum of concentration 1-3 × 105 CFU mL-1 was pipetted onto the surface of assessed both functionalized and respective control membranes and incubated in 12-well plates for 4 h at 37 °C. Kinetics of resazurin metabolization, i.e. its reduction to fluorescent resorufin, was evaluated fluorimetrically (λex520/λem590 nm). A number of viable bacteria on the membranes expressed as CFU mL-1 was calculated from the kinetic curves by using calibration curves that were constructed for both experimental bacterial species. Antimicrobial activities of the membranes were evaluated by either resazurin assay or modified ISO 20743 plate count assay. Results of both assays showed the significant antimicrobial activity of membranes functionalized with silver nanoparticles for both bacterial species and wastewater treatment plant effluent bacteria as well (log CFU reduction compared to control membrane > 4), while membranes containing specific quaternary ammonium salts were inefficient (log CFU reduction < 1). The suitability of resazurin microplate assay for testing nanofiber filtration membranes and analogous matrices has proven to be a faster and less demanding alternative to the traditionally used approach providing comparable results.
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Affiliation(s)
- Eva Travnickova
- RECETOX Centre, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czechia
| | - Premysl Mikula
- RECETOX Centre, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czechia
- Department of Veterinary Public Health and Forensic Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1946/1, 612 42, Brno, Czechia
| | - Jakub Oprsal
- SYNPO a. s., Pardubice, S. K. Neumanna 1316, 532 07, Pardubice, Czechia
| | - Marie Bohacova
- SYNPO a. s., Pardubice, S. K. Neumanna 1316, 532 07, Pardubice, Czechia
| | - Lubomir Kubac
- Centre for Organic Chemistry Ltd., Rybitvi 296, 533 54, Rybitvi, Czechia
| | - Dusan Kimmer
- Centre of Polymer Systems, University Institute, Tomas Bata University, Trida Tomase Bati 5678, 760 01, Zlin, Czechia
| | - Jana Soukupova
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Palacky University, Slechtitelu 27, 783 71, Olomouc, Czechia
| | - Michal Bittner
- RECETOX Centre, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czechia.
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Javorka V, Malik M, Mizickova M, Palenik S, Mikula P, Redecha M. Intraprocedural complications of uterine fibroid embolisation and their impact on long-term clinical outcome. BRATISL MED J 2019; 120:734-738. [PMID: 31663347 DOI: 10.4149/bll_2019_122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVES Authors evaluate the impact of intraprocedural complications on successful technical realisation and long-term clinical outcome of the uterine fibroid embolisation. BACKGROUND The uterine artery embolisation (UAE) has become an accepted treatment method for uterine fibroids. In general, the unilateral embolisation is considered to be insufficient due to poor clinical effect. METHODS Overall, 165 uterine artery embolisations were analysed (retrospectively-prospectively) in 163 female patients. Intraprocedural complications and their impact on the possibility to perform bilateral embolisationwere evaluated. In patients with unscheduled unilateral embolisation, short-term as well as long-term clinical effects were observed with mean follow-up period of 41 months. RESULTS The bilateral uterine artery embolisation was possible in 95.7 % (95 %, CI 91.3-99.4 %) procedures. The unilateral embolisation was reported in 7 procedures (4.3 %, CI 1.2-8.3 %) and reasons were following: resistant arterial spasm in 4 patients (2.5 %, CI 0.7 %-5.3 %) and impossible catheterisation due to unfavourable anatomic situation in 3 patients (1.8 %, CI 0.3-4.1 %). Other complications, such as dissection and perforation, did not affect the successful technical realisation. The long-term clinical effect of unscheduled unilateral embolisation was reported in 5 patients. CONCLUSION The results of our series of unscheduled unilateral uterine fibroid embolisation had high long-term clinical success rate. In way of unscheduled unilateral embolisation, we recommend MRI follow-up and reintervention only in way of persistence or recurrence of symptoms with concurrent MRI finding of residual fibroids(Tab. 5, Fig. 3, Ref. 12).
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Mikula P, Mlnarikova M, Takahashi H, Babica P, Kuroda K, Blaha L, Sovadinova I. Branched Poly(ethylene imine)s as Anti-algal and Anti-cyanobacterial Agents with Selective Flocculation Behavior to Cyanobacteria over Algae. Macromol Biosci 2018; 18:e1800187. [PMID: 30156762 DOI: 10.1002/mabi.201800187] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/17/2018] [Indexed: 11/07/2022]
Abstract
Poly(ethylene imine)s (PEIs) have been widely studied for biomedical applications, including antimicrobial agents against potential human pathogens. The interactions of branched PEIs (B-PEIs) with environmentally relevant microorganisms whose uncontrolled growth in natural or engineered environments causes health, economic, and technical issues in many sectors of water management are studied. B-PEIs are shown to be potent antimicrobials effective in controlling the growth of environmentally relevant algae and cyanobacteria with dual-functionality and selectivity. Not only did they effectively inhibit growth of both algae and cyanobacteria, mostly without causing cell death (static activity), but they also selectively flocculated cyanobacteria over algae. Thus, unmodified B-PEIs provide a cost-effective and chemically facile framework for the further development of effective and selective antimicrobial agents useful for control of growth and separation of algae and cyanobacteria in natural or engineered environments.
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Affiliation(s)
- Premysl Mikula
- Research Centre for Toxic Compounds in the Environment (RECETOX) Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic
| | - Marie Mlnarikova
- Research Centre for Toxic Compounds in the Environment (RECETOX) Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic
| | - Haruko Takahashi
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, 1011 North University Avenue, Ann Arbor, MI, 48109, USA
| | - Pavel Babica
- Research Centre for Toxic Compounds in the Environment (RECETOX) Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic
| | - Kenichi Kuroda
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, 1011 North University Avenue, Ann Arbor, MI, 48109, USA
| | - Ludek Blaha
- Research Centre for Toxic Compounds in the Environment (RECETOX) Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic
| | - Iva Sovadinova
- Research Centre for Toxic Compounds in the Environment (RECETOX) Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic
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Sehonova P, Plhalova L, Blahova J, Doubkova V, Marsalek P, Prokes M, Tichy F, Skladana M, Fiorino E, Mikula P, Vecerek V, Faggio C, Svobodova Z. Effects of selected tricyclic antidepressants on early-life stages of common carp (Cyprinus carpio). Chemosphere 2017; 185:1072-1080. [PMID: 28764131 DOI: 10.1016/j.chemosphere.2017.07.092] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 07/16/2017] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
Despite the fact that pharmaceuticals occur in surface water in low concentrations, they can still have adverse effect on aquatic biota, because these substances are designed to have a specific mode of action even at low concentrations. To our knowledge, only little is known about the long-term effect of tricyclic antidepressant residues on non-target animals, especially fish. Hence, the aim of this study was to assess the effect of subchronic exposure to selected tricyclic antidepressants - namely, amitriptyline, nortriptyline, and clomipramine and their mixture - on early-life stages of common carp (Cyprinus carpio). Two embryo-larval toxicity tests with common carp were performed, each taking 30 days. For the experiment, three tricyclic antidepressants as well as their mixtures were tested at three different concentrations - 10, 100 and 500 μg/L. Hatching and mortality were recorded twice a day. In addition, samples were taken at regular intervals in order to record developmental stage, morphometric and condition characteristics and morphological anomalies. At the end of the test, additional samples were taken for histopathological examination and also for the determination of antioxidant and biotransformation enzyme activity and lipid peroxidation and protein carbonylation. Long-term exposure resulted in a significant increase in mortality, developmental retardation, morphological anomalies, and pathological changes in brain, heart, and cranial and caudal kidney. In addition, changes in antioxidant enzyme activity as well as increased lipid peroxidation were observed, even at the lowest tested concentrations. Hence, environmentally relevant concentrations of TCAs have the potential to cause harmful effects on early-life stages of fish.
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Affiliation(s)
- Pavla Sehonova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic; Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Lucie Plhalova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Jana Blahova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Veronika Doubkova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic; Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Petr Marsalek
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Miroslav Prokes
- Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Brno, Czech Republic
| | - Frantisek Tichy
- Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Michaela Skladana
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Emma Fiorino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Premysl Mikula
- Department of Veterinary Public Health and Forensic Medicine, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Vladimir Vecerek
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Caterina Faggio
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Zdenka Svobodova
- Department of Animal Protection, Welfare and Behaviour, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic.
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Mikula P, Nagyova I, Vitkova M, Szilasiova J. Multiple sclerosis and coping: is disease management easier with good self-esteem? Eur J Public Health 2016. [DOI: 10.1093/eurpub/ckw175.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lachytova M, Katreniakova Z, Mikula P, Nagyova I. Self-rated health in relation to mental health, physical activity, sedentary behaviour in adolescents. Eur J Public Health 2015. [DOI: 10.1093/eurpub/ckv171.081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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13
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Mikula P, Kalhotka L, Jancula D, Zezulka S, Korinkova R, Cerny J, Marsalek B, Toman P. Evaluation of antibacterial properties of novel phthalocyanines against Escherichia coli – Comparison of analytical methods. Journal of Photochemistry and Photobiology B: Biology 2014; 138:230-9. [DOI: 10.1016/j.jphotobiol.2014.04.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 04/13/2014] [Accepted: 04/21/2014] [Indexed: 11/29/2022]
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Mikula P, Nagyova-Rajnicova I, Krokavcova M, Vitkova M, Rosenberger J, Szilasiova J, Gdovinova Z, Groothoff JW, van Dijk JP. The mediating effect of coping on the association between fatigue and quality of life in patients with multiple sclerosis. Eur J Public Health 2013. [DOI: 10.1093/eurpub/ckt123.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mikula P, Vrana M, Saroun J, Em V, Seong BS. Multiple Bragg reflections in cylindrically bent perfect crystals. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311093470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mráz L, Karlsson L, Hamák I, Vrána M, Mikula P. Neutron diffraction analysis of residual strain/stress distribution in the vicinity of high strength welds. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100644002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Haluzova I, Modra H, Mikula P, Svobodova Z. Subchronic exposure of the common carp (Cyprinus carpio) to four herbicide formulations: Effect on the haematological indice. Toxicol Lett 2009. [DOI: 10.1016/j.toxlet.2009.06.543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mikula P, Modra H, Nemethova D, Groch L, Svobodova Z. Effects of subchronic exposure to LASSO MTX (alachlor 42% W/V) on hematological indices and histology of the common Carp, Cyprinus carpio L. Bull Environ Contam Toxicol 2008; 81:475-479. [PMID: 18654729 DOI: 10.1007/s00128-008-9500-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Accepted: 07/14/2008] [Indexed: 05/26/2023]
Abstract
The aim of the study was to evaluate subchronic toxic effects of the preparation LASSO MTX (alachlor 42% W/V) on hematological indices and histology of the common carp (Cyprinus carpio L.). In carp exposed for 28 days to LASSO MTX in the concentration of 2,400 microg L(-1), significant differences (p < 0.05), were detected in all indices of the erythrocyte profiles tested except hematocrit (PCV) when compared to controls. At a lower exposure (240 microg L(-1)) concentration of blood hemoglobin and mean corpuscular hemoglobin were significantly reduced. In contrast, no influence of the preparation on leucopoiesis was demonstrated, and only slight changes were observed in histopathological indices.
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Affiliation(s)
- Premysl Mikula
- Department of Veterinary Public Health and Toxicology, University of Veterinary and Pharmaceutical Sciences, Faculty of Veterinary Hygiene and Ecology, Palackeho 1-3, 612 42 Brno, Czech Republic.
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Modra H, Haluzova I, Blahova J, Havelkova M, Kruzikova K, Mikula P, Svobodova Z. Effects of subchronic metribuzin exposure on common carp (Cyprinus carpio). Neuro Endocrinol Lett 2008; 29:669-674. [PMID: 18987601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Accepted: 09/05/2008] [Indexed: 05/27/2023]
Abstract
OBJECTIVES Effects of metribuzin on biochemical and haematological indices, induction of specific biomarkers and impacts on biometric parameters of Cyprinus carpio were investigated for subchronic conditions. METHODS Juvenile fish were exposed to 0.175 mg.L-1 or 1.75 mg.L-1 metribuzin for 28 days. Haematological indices were assessed using unified methods of haematological examination in fish. Biochemical indices were determined by biochemical analyzer, hepatic vitellogenin content was estimated by direct sandwich ELISA. Cytochrome P450 concentration and ethoxyresorufin O-deethylase activity were measured in liver spectrophotometrically and spectrofluorimetrically, respectively. RESULTS Increased haematocrit and RBC count were found in fish exposed to 1.75 mg.L-1 metribuzin compared to control fish (p<0.05). Other indices contents and biomarkers levels were not significantly changed by either concentration of metribuzin. CONCLUSION Sublethal metribuzin pollution may have adverse impacts on haematological parameters in common carp.
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Affiliation(s)
- Helena Modra
- Department of Veterinary Public Health and Toxicology, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
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Mikula P, Vrana M, Wagner V. Boost of multiple reflection effects – a new challenge for high-resolution neutron experiments. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308093938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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22
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Wimpory R, Mikula P, Šaroun J, Poeste T, Li J, Hofmann M, Schneider R. Efficiency Boost of the Materials Science Diffractometer E3 at BENSC: One Order of Magnitude Due to a Horizontally and Vertically Focusing Monochromator. ACTA ACUST UNITED AC 2008. [DOI: 10.1080/10448630701831995] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mikula P, Dobsíková R, Svobodová Z, Jarkovský J. Evaluation of xenoestrogenic potential of propylparaben in zebrafish (Danio rerio). Neuro Endocrinol Lett 2006; 27 Suppl 2:104-7. [PMID: 17159791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Accepted: 11/05/2006] [Indexed: 05/12/2023]
Abstract
OBJECTIVES Xenoestrogenic potential of propylparaben (PP), one of the most commonly used preservatives in drugs, cosmetics and food, was investigated in vivo using zebrafish (Danio rerio). METHODS Juvenile zebrafish (20 days post hatching) were exposed to three different concentrations of propylparaben (PP) dissolved in ethanol and added into the water. After 20 days of exposure the fish were euthanized and vitellogenin concentrations in their whole body homogenates were measured by the method of direct sandwich ELISA. Simultaneously, vitellogenin concentrations in either fish from the control group (exposed to solvent without the substance tested) and in fish from the positive control group (exposed to natural estrogen 17beta-estradiol) were measured. RESULTS Vitellogenin concentration in whole body homogenates of control fish was 400 (396-540) ng/ml(-1) (geometric mean (95% CI)). Zebrafish exposure to propylparaben at the concentrations of 0.1; 0.4 and 0.9 mg/l(-1) elicited statistically significant decline (P<0.001) of vitellogenin production, i.e. geometric means of vitellogenin concentrations in whole body homogenates were 240 (186-311); 218 (175-270) and 270 (234-311) ng/ml(-1), respectively. Conversely, the geometric mean of vitellogenin concentration in whole body homogenates of zebrafish exposed to 100 ng/ml(-1) of 17beta-estradiol (positive control) was significantly higher (P<0.001) than values in all other groups, i.e. 35,553 (16,860-74,968) ng/ml(-1). CONCLUSIONS Our results suggest an antiestrogenic potential of propylparaben tested in vivo in juvenile zebrafish (Danio rerio). The estrogenic effect of 17beta-estradiol was confirmed.
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Affiliation(s)
- Premysl Mikula
- Department of Veterinary Public Health and Toxicology, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic.
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Mikula P, Vrana M, Wagner V. High-resolution neutron diffraction monochromators. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305093943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Lukás P, Tomota Y, Harjo S, Neov D, Strunz P, Mikula P. In situ neutron diffraction study of drawn pearlitic steel wires upon tensile deformation. J of Neutron Res 2001. [DOI: 10.1080/10238160108200172] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Ono M, Vrána M, Torii S, Tayo T, Olkawa K, Kamiyama T, Waku Y, Fukunaga T, Suzuki K, Mikula P, LukáS P. Strain determination of an eutectic single crystal composite Al2O3/Y3Al5O12 (YAG) by neutron diffraction techniques at reactor and pulsed sources. J of Neutron Res 2001. [DOI: 10.1080/10238160108200155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Strunz P, Saroun J, Mikula P, Lukás P, Eichhorn F. Double-Bent-Crystal Small-Angle Neutron Scattering Setting and its Applications. J Appl Crystallogr 1997. [DOI: 10.1107/s0021889897001271] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Theoretical relations for optimum adjustments of two arrangements of a double-bent-crystal (DBC) small-angle neutron scattering (SANS) diffractometer are discussed. Results of several experiments demonstrate the applicability of DBC SANS in the investigation of some technologically important materials in the range of scattering-vector sizes 0.0002–0.02 Å−1. Formulas derived for data analysis, which describe the transformation of the SANS cross section to the measured intensity, indicate that water calibration is not required and that the indirect method of data evaluation is the most appropriate.
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Mikula P, Lukas P, Vrana M, Strunz P, Wagner V. Advanced neutron diffraction for microstructure analysis of polycrystalline materials. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396097553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Šaroun J, Lukáš P, Mikula P, Alefield B. Optimization of a double bent-crystal diffractometer for neutron small-angle scattering experiments. J Appl Crystallogr 1994. [DOI: 10.1107/s0021889893006831] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Vrána M, Lukáš P, Wagner V, Alefeld B. High-resolution powder diffractometry with a bent perfect crystal monochromators. Acta Crystallogr A 1993. [DOI: 10.1107/s0108767378089230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Wagner V, Scherm R. Focusing double bent crystal (DBC) diffractometer for medium-resolution small-angle neutron scattering (SANS) experiments. J Appl Crystallogr 1991. [DOI: 10.1107/s0021889891001607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Lukáš P, Kulda J, Mikula P, Sedláková L, Alexandrov YA, Vrána M. A neutron TOF investigation of dynamical reflectivity of elastically deformed crystals. Acta Crystallogr A 1991. [DOI: 10.1107/s0108767390011667] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Guigay JP, Mikula P, Hock R, Baruchel J, Waintal A. Wavelength dependence of the reflectivity in neutron diffraction by perfect vibrating crystals. Acta Crystallogr A 1990. [DOI: 10.1107/s0108767390005517] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
Some experimental results are presented for an elastically bent perfect silicon crystal in a strongly asymmetric diffraction geometry as a neutron monochromator. The use of this unconventional geometry of the monochromator appears to be suitable for a wide (several centimetres) incident polychromatic beam, when, thanks to the spatial condensation of the diffracted neutrons (Fankuchen effect), a high monochromatic beam density may be obtained. Furthermore, when using focusing in real and in momentum space by adjusting an optimum bending radius, the intensity diffracted by a sample may be comparable even with the best mosaic monochromators such as highly oriented pyrolytic graphite (PG). A comparison is demonstrated on the rocking curves of a strongly mosaic Ni–Al(020) crystal obtained with the monochromatic beam from bent Si(111), Si(400) and from PG(002), Cu(220) mosaic monochromators.
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Mikula P, Lukáš P, Eichhorn F. A new version of a medium-resolution double-crystal diffractometer for the study of small-angle neutron scattering (SANS). J Appl Crystallogr 1988. [DOI: 10.1107/s0021889887008653] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A new version of a SANS instrument based on two bent perfect Si crystals in the nondispersive (1, −1) setting is presented. Unlike an earlier proposal which employed bent crystals in symmetric diffraction geometry [Kulda & Mikula (1983). J. Appl. Cryst.
16, 498–504], use of the crystal analyser in the fully asymmetric geometry enables the angular dependence of the SANS intensity to be transformed into the positional dependence along its longest edge. This makes it possible to employ a one-dimensional position-sensitive detector and thus significantly increase the speed of collection of experimental data. Momentum-transfer resolution may be easily controlled by an adjustment of the bending radii of the crystals. Use was made of diffraction by the (111) crystal planes at a neutron wavelength of 0.2 nm to measure powder samples of Si3N4, poly(vinyl chloride)/poly(methyl methacrylate) and CrO2 in order to demonstrate the practical efficiency of the proposed device.
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Mikula P, Lukáš P, Michalec R. An experimental test of an elastically bent silicon crystal as a thermal-neutron monochromator. J Appl Crystallogr 1987. [DOI: 10.1107/s0021889887086345] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Kulda J, Horalík L, Chalupa B, Lukáš P. The spatial condensation of the neutron beam by an asymmetric diffraction in thermal-neutron monochromatization. J Appl Crystallogr 1986. [DOI: 10.1107/s0021889886089288] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Chalupa B, Kulda J, Vrána M, Sedláková L, Michalec RT. An experimental test of a double-crystal monochromator for thermal neutrons based on two bend silicon crystals. J Appl Crystallogr 1985. [DOI: 10.1107/s0021889885009980] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Alexandrov YA, Chalupa B, Kulda J, Machekhina TA, Michalec R, Mikula P, Sedlakova LN, Vrana M. Dynamical neutron diffraction studies on Si single crystals by the TOF method. Acta Crystallogr A 1984. [DOI: 10.1107/s0108767384089595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Chalupa B, Michalec R, Mikula P. Control of anomalous neutron transmission by ultrasonic vibrations. Acta Crystallogr A 1984. [DOI: 10.1107/s0108767384089753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Kulda J, Chalupa B. A highly efficient double-crystal monochromator for thermal neutrons. Acta Crystallogr A 1984. [DOI: 10.1107/s0108767384089091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mikula P, Kulda J, Vrána M, Chalupa B. A proposal for a highly efficient double-crystal monochromator for thermal neutrons. J Appl Crystallogr 1984. [DOI: 10.1107/s0021889884011274] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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Michalec R, Mikula P, Sedláková L, Chalupa B, Zelenka J, Petržílka V, Hrdlička Z. Effects of thickness-shear vibrations on neutron diffraction by quartz single crystals. J Appl Crystallogr 1975. [DOI: 10.1107/s0021889875010667] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Michalec R, Chalupa B, Sedláková L, Mikula P, Petržílka V, Zelenka J. Diffraction of neutrons by a vibrating quartz bar in the Laue case. J Appl Crystallogr 1974. [DOI: 10.1107/s002188987401048x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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