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Tytuł:
Composition of norfloxacin-resistant bacteria and isolation of norfloxacin-degrading bacteria in subtropical aquaculture ponds in China
Autorzy:
Mao, Lutian
Chen, Lifen
Wang, Xirui
Xu, Zhongbao
Ouyang, Hui
Huang, Biyou
Zhou, Libin
Powiązania:
https://bibliotekanauki.pl/articles/4790189.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-throughput sequencing
norfloxacin
antibiotic resistant bacterium
pond culture
Opis:
To analyze the composition of norfloxacin-resistant bacteria and norfloxacin-degrading bacteria in pond water and sediment in subtropical China, the composition of antibiotic resistant bacteria in pond water and sediment enriched with norfloxacin-containing medium was analyzed by high-throughput sequencing. Sediment and water samples were collected from 3 fish ponds in subtropical China, and domesticated with norfloxacin, subsequently norfloxacin-resistant bacteria through high-throughput sequencing of 16S rDNA, and isolated norfloxacin--degrading bacteria. Our results showed that the pond sediment and water contain a variety of norfloxacin-resistant bacteria, mainly from Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Chloroflexi. Moreover, we isolated two norfloxacin-degrading bacteria (NorXu-2 and NorXu-3). The norfloxacin-degrading rate by NorXu-2 and NorXu-3 in the culture mediums with 200 μg/mL was the highest, which was up to 49.71% and 35.79%, respectively. When the norfloxacin concentration was 200 μg/mL, NorXu-2 and NorXu-3 had the best norfloxacin- -degrading effect at pH of 6, and the degradation rates were 53.64% and 45.54%, respectively. Moreover, NorXu-3 exhibited a good tolerance to high NaCl concentration. These results not only provided basic data for the follow-up study of the molecular mechanism of antimicrobial microbial degradation, but also provided potential norfloxacin degrading bacteria for norfloxacin removal and bioremediation in aquaculture environment.
Źródło:
Archives of Environmental Protection; 2022, 48, 4; 95--101
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence and plasmid profiles of multidrug-resistant Enterobacteriaceae isolated from hawked soymilk samples in the Polytechnic of Ibadan Community, Nigeria
Autorzy:
Fadahunsi, I.F.
Babalola, D.O.
Powiązania:
https://bibliotekanauki.pl/articles/2096396.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
occurrence
plasmid profiles
multidrug-resistant Enterobacteriaceae
soymilk
Ibadan Polytechnic
Community
Opis:
This study was conducted to determine the occurrence, antibiotic susceptibility pattern, and plasmid profile of multidrug-resistant (MDR) Enterobacteriaceae isolated from soymilk hawked in the Ibadan Polytechnic Community, Nigeria. Bacterial isolation and identification were performed using a culture-dependent method and biochemical characterization, respectively, while antibiotic susceptibility was tested using the disk diffusion method. Plasmid analysis and curing were performed using standard procedures. The results revealed the following occurrence rate of bacterial species in soymilk samples collected from all axes (South, North, East, West, and Central) of Ibadan Polytechnic: Citrobacter spp., 64%; Klebsiella spp., 7%; Enterobacter spp., Escherichia coli, and Serratia spp., 6% each; Proteus spp., 5%; and Salmonella spp. and Shigella spp., 3% each. The highest heterotrophic bacterial count of 9.3 × 103 CFU/ml was recorded at Ibadan Polytechnic North and South, while the least count (3.2 × 107 CFU/ml) was recorded at Ibadan Polytechnic Central. The highest enteric bacterial count of 1.3 × 103 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic Central, while the least count of 1.7 × 107 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic North. A total of 26% of the isolates showed resistance to cefpodoxime, while 88% of the isolates were susceptible to trimethoprim-sulfamethoxazole. Four of the MDR isolates possessed plasmid bands ranging from 6 to 1 with molecular weights from 2.7 to 17.2 kbp. Enterobacteriaceae such as isolates O14 (Klebsiella spp.) and B10 (E. coli) retained their resistance to antibiotics even after removal of plasmids, while isolates S13 (Citrobacter spp.) and O4 (Shigella spp.) were susceptible to some antibiotics after curing. Conclusively, soymilk sold in the sampled areas was highly contaminated with Enterobacteriaceae, thereby indicating poor hygiene standards of soymilk production.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 2; 209-223
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic relatedness, antibiogram and virulence factors of Staphylococcus aureus isolated from bovine mastitis and related human contacts
Autorzy:
Alekish, M.O.
Bani Ismail, Z.
Gharaibeh, M.
Abu-Qatous, L.
Powiązania:
https://bibliotekanauki.pl/articles/2087354.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intramammary infection
dairy cows
multi-drug resistant S. aureus
antimicrobial resistance
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 1; 133-141
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue life prediction for acid-resistant steel plate under operating loads
Autorzy:
Tomaszewski, T.
Strzelecki, P.
Wachowski, M.
Stopel, M.
Powiązania:
https://bibliotekanauki.pl/articles/200215.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability
macrofractography
finite element analysis
S-N curve
acid-resistant steel
Opis:
The paper evaluates the causes related to the fatigue damage in a conveyor slide plate, exposed to high-frequency cyclic loads. The plate was made of 1.4301 acid-resistant steel. The fractography showed that the plate failure was caused by fatigue crack. A nonlinear analysis of plate deformation was conducted using the finite element method (FEA) in LS-Dyna software. The maximum normal stresses in the plate fracture were used in further analysis. A “fatigue limit” calculated initially using a FITNET procedure was above the maximum stress calculated using FEA. It indicates that the structural features of the plate were selected correctly. The experimental test results for 1.4301 acid-resistant steel were described using a probabilistic Weibull distribution model. Reliability was determined for the obtained S-N curve at 50% and 5% failure probability allowing for the selected coefficients (cycle asymmetry, roughness, variable load) and the history of cyclic loading. Cumulative damage was determined using the Palmgren-Miner hypothesis. The estimated fatigue life was similar to the actual value determined in the operating conditions for the S-N curve at 5% failure probability. For engineering calculations, the S-N curve at max. 5% failure probability is recommended.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 913-921
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Attempt of the Low-Cycle Fatigue Life Description of Chosen Creep-Resistant Steels Under Mechanical and Thermal Interactions
Autorzy:
Okrajni, J.
Marek, A.
Powiązania:
https://bibliotekanauki.pl/articles/354016.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low-cycle fatigue
high temperatures
fatigue life prediction
creep-resistant steels
Opis:
The study focuses on the problem of determination of low-cycle fatigue properties for the chosen group of creep-resistant steels used in the power and chemical industries. It tries to find the parameter which would describe well the fatigue life and take into account mechanical loads and temperature. The results of LCF tests have been presented in the paper. New parameter P has been introduced. This parameter joins a plastic strain range, a stress range and temperature. The fatigue life has been predicted versus parameter P. The comparison of the predicted and observed values of fatigue life shows the agreement between these values. The method of fatigue life prediction formulated in this way is expected to describe the behavior of materials under thermo-mechanical fatigue.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2349-2353
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of Casting Materials for Working Parts of Machines for the Forestry Sector
Autorzy:
Pirowski, Zenon
Bitka, Adam
Grudzień-Rakoczy, Małgorzata
Małysza, Marcin
Pysz, Stanisław
Wieliczko, Piotr
Wilk-Kołodziejczyk, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/2106604.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mulching
forestry tools
tribological wear
abrasion-resistant cast steel
hardfacing surface
Opis:
The article was created as a result of the work TECHMATSTRATEG 1 program “Modern Material Technologies” as part of the project with the acronym INNOBIOLAS entitled “Development of innovative working elements of machines in the forestry sector and biomass processing based on high-energy surface modification technologies of the surface layer of cast elements”; agreement No. TECHMATSTRATEG1/348072/2/NCBR/2017. The article discusses the procedure for selecting casting materials that can meet the high operational requirements of working tools of mulching machines: transfer of high static and dynamic loads, resistance to tribological wear, corrosion resistance in various environments. The mulching process was briefly described, then the alloys were selected for experimental tests, model alloys were made and perform material tests were carried out in terms of functional and technological properties. The obtained results allowed to select the alloy where the test castings were made.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 743--752
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular docking and pharmacokinetic prediction of phytochemicals from Syzygium cumini in interaction with penicillin-binding protein 2a and erythromycin ribosomal methylase of Staphylococcus aureus
Autorzy:
Shidiki, A.
Vyas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2096259.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
methicillin-resistant S. aureus
penicillin-binding protein 2a
erythromycin ribosomal methylase
Opis:
Background. MRSA and MLSB resistant S. aureus are known as important pathogens, which are responsible for many cases of both hospital and community-acquired infections worldwide. Studying drug discovery from plant sources is regarded as an important prevention strategy regarding these types of infections. Material and methods. Agar well diffusion method was performed for antimicrobial evaluation, LCMS technique used for identification of different compounds, molecular docking performed by application of iGEMDOCK for PBP2a and ERM to plant compounds, and its pharmacokinetic evaluation of ADMET through use of AdmetSAR. Results. Water extract was the most effective against resistant strains of Staphylococcus aureus. Twenty compounds belonging to phenols, flavonoids, organic acids, terpenoids groups were reported. Eighteen plant compounds passed in Lipinski's rule of five. iGEMDOCK revealed diferulic acid has the least binding energy -102.37 kcal/mole to penicillin-binding protein 2a and taxifolin has the least binding energy of -103.12 kcal/mole to erythromycin ribosomal methylase in comparison to control linezolid. These compounds raise the potential for developing potent inhibitors of penicillin-binding protein 2a and erythromycin ribosomal methylase for drug development. ADMET properties revealed that eighteen studied compounds were found in category III and IV with non-toxic properties except two butin and taxifolin found in category II with toxic properties. Conclusions. It can be concluded that diferulic acid and taxifolin compounds provide the best inhibitor effect to PBP2a and ERM protein for inhibition of MRSA and MLSB resistant strains of S. aureus through the application of molecular docking, leading to a lead drug candidate for the treatment of diseases.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 1; 5-18
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacture of two-layer castings using Fe base heat-resistant alloys
Wytwarzanie odlewów dwuwarstwowych z zastosowaniem stopów żaroodpornych na osnowie Fe z mikrostrukturą typu ferryt i austenit
Autorzy:
Rzepka, G.
Nawrocki, J.
Sieniawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/176262.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grey cast iron
heat resistant ductile iron
heat-resistant cast steel
two-layer material
intermediate zone
casting
żeliwo szare
żaroodporne żeliwo sferoidalne
żaroodporne staliwo
materiał dwuwarstwowy
warstwa przejściowa
odlewanie
Opis:
The main purpose of the present study is to verify the possibility of joining grey iron EN-GJL-250 with heat resistant ductile iron GJS-XSiMo5-1 and heat resistant cast steel GX40CrNiSiNb25-20 to create the two-layered material using casting process with materials in liquid state and in solid state. The mentioned above method was assumed to solve in an economically justified manner the problem of defects on turbocharger’s housing which occurred in some high performance premium application. Evaluation of joint quality was investigated by microstructure observation (LM), alloy elements diffusion (SEM), hardness measurement and discontinuity inspection by computed tomography scanning (CT).
W pracy przedstawiono rezultaty badań określających stopień możliwości wytworzenia połączenia żeliwo szare EN-GJL-250 – żaroodporne żeliwo sferoidalne GJS-XSiMo5-1 lub żaroodporne staliwo GX40CrNiSiNb25-20 w procesie odlewania – materiał w stanie ciekłym i materiał w stanie stałym. Analiza uzyskanych wyników badań wskazuje, że zaproponowana metoda jest ekonomicznie uzasadniona dla rozwiązania występujących wad w obudowie turbosprężarki pojawiających się podczas pracy w warunkach dużej wydajności. Ocenę jakości połączenia prowadzono w badaniach mikrostruktury połączenia (LM i SEM), pomiarach twardości i kontroli nieciągłości przy użyciu tomografii komputerowej (CT).
Źródło:
Advances in Manufacturing Science and Technology; 2018, 42, 1-4; 31-41
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot Formability of Heat-Resistant Stainless Steel X15CrNiSi20-12
Autorzy:
Kawulok, R.
Schindler, I.
Navrátil, H.
Ševčák, V.
Sojka, J.
Konečná, K.
Chmiel, B.
Powiązania:
https://bibliotekanauki.pl/articles/355196.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat-resistant stainless steel
hot tension test
nil strength temperature
nil ductility temperature
Opis:
High-temperature plastic properties of heat-resistant stainless steel X15CrNiSi20-12 were assessed on the basis of hot tensile tests and nil strength tests. The results were supported by metallographic analyses using SEM and EDX analysis. The formability of the investigated steel can be divided into roughly three temperature areas. In the temperature range of 900°C to about 1050°C, formability was negatively affected by precipitation of carbide particles at grain boundaries. As the temperature rose to 1200°C, these particles dissolved, resulting in an increase in formability. Further temperature increases resulted in a relatively steep drop in formability caused by overheating of the material. The nil ductility temperature of 1280°C and the nil-strength temperature of 1362°C were determined. The Plastic and strength properties of the investigated material were compared with the deformation behavior of the reference steel X5CrNi18-10, which shows a significantly wider range of suitable forming temperatures.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 727-734
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a New ATD-P Tester for Hard Wear Resistant Materials
Autorzy:
Dojka, M.
Dojka, R.
Studnicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/380369.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
crystallization
TDA
ATD tester
wear resistant materials
krystalizacja
ATD
ścieranie
materiały odporne na ścieranie
Opis:
The aim of presented studies was to develop a new geometry of the overflow part of standard ATD–C tester for derivative thermal analysis in a way that it would allow to obtain samples for abrasion and mechanical properties tests in the same mould without the need of cutting them from a block of material. The pattern of new ATD–P tester has parts reflecting implemented samples. Computer simulations regarding initial verification of new tester were performed in NovaFlow software. Chromium cast iron melts were made for testing the sampler in real conditions and TDA analysis for casting material were conducted. The sandmix was prepared on silica sand matrix according to the ALPHASET technology. This new solution greatly simplifies the preparations of materials difficult to machine.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 37-40
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Redox control of photosynthetic acclimation in plants
Autorzy:
Pfannschmidt, T.
Powiązania:
https://bibliotekanauki.pl/articles/81175.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
redox control
photosynthesis
acclimation
plant
dynamic process
stoichiometry
nuclear gene
stress-resistant crop
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence of new sequence types of methicillin-resistant Staphylococcus pseudintermedius in Italy
Autorzy:
Nocera, F.P.
Parisi, A.
Corrente, M.
De Martino, L.
Powiązania:
https://bibliotekanauki.pl/articles/2087290.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
methicillin-resistant S. pseudintermedius
canine skin diseases
Multi-Locus Sequence Typing
new sequence types
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 3; 465-468
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Type of Welding Sequence During Hardfacing Chromium Cast Iron for Erosion Resistance
Autorzy:
Gucwa, M.
Bęczkowski, R.
Winczek, J.
Wyleciał, T.
Powiązania:
https://bibliotekanauki.pl/articles/382472.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloys
hardfacing
erosion
welding
hardness
stopy odporne na zużycie
napawanie
erozja
spawanie
twardość
Opis:
The paper presents the capabilities of welding techniques to creating properties of wear resistant high chromium cast iron alloy. The use of the right kind of welding sequence allows you to change the structure and properties of the obtained welds. Tests were conducted for one type of additive material in the form of self shielded core wire. In order to determine the effect of the type of welding sequence on the properties of welds performed welding using string bead and weave bead. The resulting weld was tested on hardness and research structure in an optical microscope. In the following studies have been made erosive tests wear of made hardfacing. String beads gave structure rich in carbides and harder about 270 HV of the weld with weave bead. Also, wear resistance was nearly twice as better for welds made with string beads. In the experiment a decisive role in the resistance to wear plays a high hardness of the deposit and the presence of carbides in its structure. Changes in the basic parameters of the deposition process allows for the formation of structure and properties of hardfacing welds in a wide range.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 51-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspekty wytwarzania żeliwa wysokokrzemowego w warunkach przemysłowych
Aspects of silicon cast iron production in industrial conditions
Autorzy:
Stawarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/382631.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
żeliwo wysokokrzemowe
materiał kwasoodporny
produkcja odlewu
high silicon cast iron
acid resistant material
casting production
Opis:
W artykule opisano prace związane z próbą wytworzenia odlewów z żeliwa wysokokrzemowego w warunkach przemysłowych. Zwrócono głównie uwagę na napotkane trudności w produkcji odlewów z tego materiału. Okazało się, że pomimo 100 letniej tradycji w produkcji odlewów z żeliwa wysokokrzemowego (pierwszy odlew wytworzony z tego materiału i zastosowany z powodzeniem w warunkach przemysłowych wykonano w 1907 roku p rzez francuza Jouve [1]), materiał ten nadal stwarza wiele trudności podczas procesu produkcyjnego. Należą do nich pękanie związane z wysoką kruchością lub tzw. efekt „rośnięcia” metalu związany z dużą zdolnością do absorpcji gazów przez kąpiel metalową podczas procesu metalurgicznego przygotowania stopu do odlewania [2].
The article describes the work associated with the attempt to manufacture silicon cast iron in industrial conditions. Most attention has been paid to the difficulties encountered in the production of castings from this material. It turned out that despite 100 years of tradition in the production of silicon cast iron (first castings produced from this material and used successfully in industrial conditions were made in 1907 by Frenchman Jouve [1]), this material still poses many difficulties during the manufacturing process such as: cracking associated with high fragility or so called "grow" effect of the metal associated with large capacity to absorb gases through the metal bath during the process of preparing an alloy for casting [2].
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 205-208
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anodic Oxide Coatings on Aluminium Resistant to Strong Alkali Environment
Autorzy:
Kozik, A.
Nowak, M.
Gędłek, K.
Leśniak, D.
Zasadziński, J.
Jurczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/355544.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anodic coating
sealing of anodic coatings
resistant to strong alkali environment
sealing quality
aluminium alloys
Opis:
The aim of this paper was to test currently available on the market products for sealing anodic oxide coatings as well as to test the use of other alternative substances improving the sealing process. The ability to seal in 10 different solutions and the quality of the seal has been tested. The influence of the applied preparations on corrosion resistance and resistance to strongly alkaline environment was also investigated. Based on the results obtained, satisfactory results were archived for the sample sealed in a IMN-OML (Institute of Non-Ferrous Metals in Gliwice, Light Metals Division) solution sealant and in solution of nickel acetate in a medium-temperature process. Sealing by means of nickel acetate solutions is economically justified, and its use allows the process temperature to be lowered. When it comes to resistance to alkalis, samples sealed in IMN-OML sealant are the best. Commercial solutions have also achieved positive results in all tests.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1335-1342
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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