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Wyświetlanie 1-15 z 63
Tytuł:
Pleistocene deposits in the Southern Egyptian Sahara: lithostratigraphic relationships of sedimentsand landscape dynamics at Bir Tarfawi
Autorzy:
Hill, Christopher L.
Schild, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/2026009.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sediments
lithofacies
stratigraphy
groundwater
Pleistocene
Opis:
The sedimentological and lithostratigraphic record from north-central Bir Tarfawi documents the presence of Pleistocene basin-fill deposits. Three topographic basins were created as a result of deflation during climate episodes associated with lowering of the local groundwater table. In each case, the three deflational basins or topographic depressions were subsequently filled with sediments; these basin aggradations coincided with changes from arid climate conditions to wetter conditions and a rise in the groundwater table. The oldest and highest sedimentary remnant is associated with Acheulian artifacts and may reflect spring-fed pond and marsh conditions during a Middle Pleistocene wet climate episode. Lithofacies for a lower stratigraphic sequence (the “White Lake”) documents deposition in a perennial lake that varied in extent and depth and is associated with Middle Paleolithic artifacts. A third episode of deflation created a topographic low that has been filled with Late Pleistocene sediments that are associated with Middle Paleolithic artifacts and fossil remains. Lateral and vertical variations in the lithofacies of this basin-fill sequence and the sediments of the “grey-green” lake phases provide a record of changing hydrologic conditions. These hydrologic conditions appear to reflect variations in water-table levels related to groundwater recharge and, at times, local rains.
Źródło:
Studia Quaternaria; 2017, 34; 23-38
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions
Autorzy:
Krajewska, Magdalena
Szymczak-Żyła, Małgorzata
Kowalewska, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/2042142.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
HPLC
Pigments
sediments
Spitsbergen
Źródło:
Polish Polar Research; 2017, 38, 4; 423-443
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scale of pollutions with heavy metals in water and sediment of River Ibër from landfill in Kelmend, Kosovo
Autorzy:
Kadriu, Sadija
Sadiku, Milaim
Kelmendi, Mensur
Mulliqi, Ismet
Aliu, Mehush
Hyseni, Arbër
Powiązania:
https://bibliotekanauki.pl/articles/89156.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
river
waters
sediments
heavy metals
Opis:
Pollution with heavy metals and waters in Mitrovica with surroundings, both in the past and in present days, is a preoccupation for the citizens of Mirtovica, as well as for the other inhabitants living around it. Such a problem has been a concern which still continues for a number of researchers who have been dealing with this issue, and who still continue to be preoccupied with the issue of heavy metal (habitat) pollution in this part of Kosovo. Heavy metal's contamination of the environment's main components, dates back to the 1970s/90s to this date. This pollution, especially of the rivers, is due to the industrial activity taking place in the Trepça Combine and the presence of industrial landfill sites of this Combine near the flow of two main rivers: the Sitnica and Ibër River waters, in the city of Mitrovica. The focus of our study, this time consists solely in the research and illumination of pollution with these heavy metals and waterworks of the Ibër River, as a result of the pollution caused by the industrial waste landfill located in Kelmend village. In the paper, we have attempted to show the concentration of heavy metals in sediment and water, by pointing at four sample sites of the Ibër river: in the Bosniak U1 neighborhood, then in the flow in front the U2 landfill, discharge flows from landfill U3 and a certain distance from the U4 landfill.
Źródło:
Mining Science; 2019, 26; 147-155
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromorphology of cryoconite on Garabashi and Skhelda glaciers and soils of Baksan Gorge, Mt. Elbrus, Central Caucasus
Autorzy:
Abakumov, Evgeny
Tembotov, Rustam
Kushnov, Ivan
Polyakov, Vyacheslav
Powiązania:
https://bibliotekanauki.pl/articles/16538453.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Russia
Caucasus
sediments
weathering
deglaciation
Opis:
In the Central Caucasus region, the intense process of deglaciation is identified as caused by cryoconite formation and accumulation. The fine earth materials were collected on the surfaces of Skhelda and Garabashi glaciers as well as from zonal soils of Baksan Gorge and were studied in terms of chemical, particle-size, and micromorpholo-gical features. Supraglacial sediments are located at the glacial drift area of material and, thus, due to transfer of these sediments to the foothill area, their fine earth material can affect micromorphological and chemical characteristics of adjacent zonal soils. Thin sections of mineral and organo-mineral micromonoliths were analyzed by classic micromorphological methods. Data obtained showed that the weathering rates of cryoconite and soil minerals are different. The cryoconite material on the debris-covered Skhelda Glacier originated from local massive crystalline rocks and moraines, while for Garabashi Glacier the volcanic origin of cryoconite is more typical. Soils of Baksan Gorge are characterized by more developed microfabric and porous media, but their mineralogical composition is essentially inherited from sediments of glacial and periglacial soils. These new data could be useful for understanding the process of evolution of the mineral matrix of cryoconite to the soil matrix formed at the foot of the mountain.
Źródło:
Polish Polar Research; 2022, 43, 1; 1-20
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the USBR equation for surveying balance of sediment yield in Dez River branches in Iran
Autorzy:
Fuladipanah, M.
Makvandi, A.
Powiązania:
https://bibliotekanauki.pl/articles/208109.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sediments
rivers
osady rzeczne
rzeki
Opis:
Accurate determination of mean annual sediment load (MASL) of natural rivers will affect administrative aspects of water planning in dams. The MASL in Dez River in the southwest Iran has been considered. Sezar and Bakhtiari are its two branches. The amount of MASL was predicted by the USBR equation with three scenarios: using mean value of sediment discharge, using probabilistic classification of river flow data and using separation of wet and dry months. The results show that the USBR equation can be used to evaluate MASL in the Dez basin.
Źródło:
Environment Protection Engineering; 2013, 39, 3; 185-195
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of the identification of relict rock glaciers on sedimentological evidence
Autorzy:
Żurawek, R.
Powiązania:
https://bibliotekanauki.pl/articles/294394.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
sediments
ground ice
relict rock glaciers
Opis:
In order to establish sedimentological criteria for the identification of relict rock glaciers, a study of published information about the internal structure of both active and relict rock glaciers has been carried out. The literature survey revealed that there is no single lithological feature which could independently serve as a proof of the decisive role of ground ice for the transport of rock debris. However, a sequence of a bouldery mantle and a core composed of diamict, together with a layering which dips steeply up-slope are the strongest premises for the elimination of any process other than that associated with a cold environment. Certainly, in attempting to distinguish between a moraine and relict rock glacier, the geo-morphological setting must be taken into account and, notwithstanding this, an effective differentiation is often virtually impossible. Sedimentological parameters such as grain size distribution, sorting and grain morphology are largely controlled by the properties of the source rock and, as such, they are of no value in attempts to identify relict rock glaciers.
Źródło:
Landform Analysis; 2003, 4; 7-15
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plutonium and americium in sediments of Lithuanian lakes
Autorzy:
Remeikis, V.
Gvozdaite, R.
Druteikiene, R.
Plukis, A.
Tarasiuk, N.
Špirkauskaite, N.
Powiązania:
https://bibliotekanauki.pl/articles/148886.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plutonium isotopes
americium
sediments
isotopic composition
Opis:
The assessment of contribution of the global and the Chernobyl NPP (Nuclear Power Plant) accident plutonium and americium to plutonium pollution in sediments of Lithuanian lakes is presented. Theoretical evaluation of activity ratios of 238Pu/239+240Pu and 241Pu/239+240Pu in the reactor of unit 4 of the Chernobyl NPP before the accident was performed by means of the ORIGEN-ARP code from the SCALE 4.4A program package. Non-uniform distribution of radionuclides in depositions on the Lithuanian territory after nuclear weapon tests and the Chernobyl NPP accident is experimentally observed by measuring the lake sediment pollution with actinides. The activity concentration of sediments polluted with plutonium ranges from 2.0 š 0.5 Bq/kg d.w. (dry weight) in Lake Asave . lis to 14 š 2 Bq/kg d.w. in Lake Juodis. The ratio of activity concentrations of plutonium isotopes 238Pu/239+240Pu measured by á-spectrometry in the 10-cm-thick upper layer of bottom sediment varies from 0.03 in Lake Juodis to 0.3 in Lake Žuvintas. The analysis of the ratio values shows that the deposition of the Chernobyl origin plutonium is prevailing in southern and south-western regions of Lithuania. Plutonium of nuclear weapon tests origin in sediments of lakes is observed on the whole territory of Lithuania, and it is especially distinct in central Lithuania. The americium activity due to 241Pu decay after the Chernobyl NPP accident and global depositions in bottom sediments of Lithuanian lakes has been evaluated to be from 0.9 to 5.7 Bq/kg.
Źródło:
Nukleonika; 2005, 50, 2; 61-66
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Persistent Organic Pollutants (POPs) and Polycyclic Aromatic Hydrocarbons (PAHs) in surface sediments from selected fjords, tidal plains and lakes of the North Spitsbergen
Autorzy:
Sapota, Grażyna
Wojtasik, Barbara
Burska, Dorota
Nowiński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2051704.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
sediments
PAHs
PCBs
OCPs
Źródło:
Polish Polar Research; 2009, 30, 1; 59-76
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary assessment of agriculture influence on heavy metal content in bottom sediments of small water reservoirs and in rushes
Autorzy:
Szydłowski, K.
Podlasińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/100909.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
agriculture
ecology
heavy metals
sediments
ponds
Opis:
The main purpose of the paper was to determine the influence of catchment management on the bottom sediments quality of small water reservoirs as well as to determine toxic metal content in rushes. Samples of bottom sediments were collected in winter 2013 year, form 4 sediment layers (0-5, 5-10, 10-20 and 20-30 cm) at three points along the body of water. The 48 samples were collected. Soil material was prepared according to the procedures used in soil science, the analysis was performed for the fraction with a particle diameter of less than 1 mm. Plant samples from single species aggregations were randomly cut from 5 to 10 locations of 20-50 m2 area. From these samples the average composite sample was prepared. The total content of such elements as Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn was determined by atomic absorption spectrometry (using the Thermo Scientific iCE 3000 series spectrometer) after prior digestion in the mixture (5:1) of concentrated acids HNO3 (65%) and HClO4 (60%). Total Hg content was determined by the AMA 254 analyzer. Between the small water reservoirs adjacent to the areas where organic farming is used, and the reservoirs adjacent to the areas with mineral fertilization there are statistically significant differences in the concentrations of such metals as nickel (layers: 0-5, 5-10, 10-20 and 0-30 cm), as well as cobalt, chromium and iron (in a layer 5-10 cm). It has been found that some plants accumulate higher amounts of heavy metals (average values). Based on obtained results it can be stated that rushes actively captures large amounts of elements reaching studied objects and thereby protect the surface water of the reservoirs from contamination.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 949-962
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Changes in Microbiological Composition of Stored Sediments
Autorzy:
Sałata, A.
Stoińska, R.
Dąbek, L.
Powiązania:
https://bibliotekanauki.pl/articles/125293.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sediments
stormwater treatment plant
microbiological analysis
Opis:
The composition of the sediments formed in the process of stormwater pretreatment is diversified and depends on many parameters, mainly on the quality of stormwater and the land use of the catchment. The stormwater sediments are characterized by heterogeneous chemical and microbiological composition. The aim of this paper was the microbiological evaluation of the sediments from four stormwater catchments in terms of hazard to humans and the environment. The pH, and the content of organic and mineral matter were determined for the examined sediments. The microbiological analysis included the determination of the total number of psychrophilic, mesophilic, and coliform bacteria, including E. coli, and also the number of faecal Enterococci, Salmonella and Shigella. The study was conducted for fresh deposits and those stored for one year in order to determine the dynamics of changes in their biological activity.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 241-246
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Diversity Characterising Certain Chemical Substances in Sediments of Besko Reservoir
Autorzy:
Piwińska, D.
Gruca-Rokosz, R.
Bartoszek, L.
Czarnota, J.
Powiązania:
https://bibliotekanauki.pl/articles/125420.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sediments
organic matter
phosphorus
heavy metals
Opis:
The article reports the conducted analyses of certain chemical parameters characterising the sediments of Poland’s Besko Reservoir. Specifically, determinations concerned the pH value, percentage organic matter (OM), total organic carbon (TOC), total nitrogen (TN), carbonates (CO32-), total phosphorus (TP) and its fractions, as well as heavy metals (Fe, Al, Cr, Cu, Ni, Cd, Zn, Mn). The sediments have a slight alkaline reaction, with pH values correlating positively with the high content of carbonates. The sediments have low organic matter content, while organic carbon accounts for about 30% of OM. The values for the C:N ratio point to an allochthonous origin for organic matter. The analysis of phosphorus fractionation showed that inorganic phosphorus (IP) is predominant at every research station. The lowest percentage for a fraction was in turn obtained for NAIP. This testifies to a slight anthropogenic impact of the catchment area. The sediments can be classified as of the 2nd purity class (according to PIG), due to their highest concentration of chromium. According to Müller’s classification, the sediments can be classified as purity class 3 (i.e. with moderate contamination). The values noted for the EF coefficient confirm a very strong enrichment by chromium ions. In addition, chromium, copper, nickel and cadmium have a negative effect on aquatic organisms. The results show that the sediments can be used for example in building and maintaining hydraulic structures.
Źródło:
Journal of Ecological Engineering; 2018, 19, 1; 104-112
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation in heavy metal distribution in the sediments of selected dams in Nasarawa State, Nigeria
Autorzy:
Gav, B. L.
Aremu, M. O.
Etonihu, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/1109614.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dams
Heavy metal
Seasonal variations
sediments
Opis:
The study was carried out to ascertain seasonal variation in heavy metal distribution in sediments from Dams located in Nasarawa State, Nigeria. Sediment samples were collected twice each at two different seasons for two years from May to September, 2014 and November-December, 2014 to March, 2015 for wet and dry seasons, respectively. Similarly, sediment samples were collected from May to September, 2015 and November-December, 2015 to March, 2016 for wet and dry seasons, respectively. The samples were then assessed for heavy metal properties, using atomic absorption spectrophotography (AAS). Analysis of variance (ANOVA) was then applied. The mean results of the heavy metal levels showed high values in dry seasons and low values in wet seasons in the two years of the study. Herein, the results of ANOVA revealed significant difference in the heavy metal concentrations between the seasons, dams and years. Our study also indicated that for heavy metals, the levels determined in sediments were within the WHO acceptable standards, except for Pb and Mn. These exceeded the WHO acceptable standards for drinking water. Based on these results, the dam waters are, therefore, polluted and unsuitable for human consumption, except after treatment.
Źródło:
World News of Natural Sciences; 2018, 20; 148-159
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The facies and biota of the oldest exposed strata of the Eocene La Meseta Formation (Seymour Island, Antarctica)
Autorzy:
Tatur, A. E.
Krajewski, K. P.
lvalle de, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/2058745.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Antarctica
Seymour
Eocene
sediments
goethite
thanatocoenosis
Opis:
La Meseta Formation is made up of estuarine and shallow marine, fossiliferous clastic deposits 720 m thick that provides a unique record of marine and terrestrial biota of Antarctic ecosystems preceding continental glaciation in the Oligocene. The lower limit of this formation has been poorly known, and therefore it has been carefully investigated. The lowest part of the La Meseta Formation, at the southern bank of a palaeodelta, is represented by relics of a prograding sequence of sediments deposited in the wave-dominated part of a deltaic system in the offshore and lower and upper shoreface environments. The sequence is completed landwards by younger tidal plain sediments deposited at 40 m lower altitude in a relatively protected, central estuarine basin, which was dominated by tidal activity and influenced by periodic fluvial inflow. These strata were deposited during a late Paleocene or Ypresian/Lutetian lowstand of sea level, which might reflect a glaciation event or glacioisostatic rebound of land following deglaciation of hypothetic Antarctic inland glaciers. Forced regression of sea level and seaward expansion of a deltaic freshwater environment, led to local extinction of a unique assemblage of marine echinoderms, bryozoans, corals and brachiopods. These marine fossils, representing a thanatocoenosis, are perfectly preserved due to syngenetic goethite permineralisation. This process owed its origin to excess reactive iron coming from sulphide-rich bedrock through weathering processes and acid sulphate drainage of the neighbouring land area.
Źródło:
Geological Quarterly; 2011, 55, 4; 345-360
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the Evolution of Redox Changes in Sediments made Possible by Electrochemical Multilayer Probes
Autorzy:
Popa, Radu
Moga, Ioana Corina
Nealson, Kenneth H.
Cimpoiasu, V.M.
Powiązania:
https://bibliotekanauki.pl/articles/2134093.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensor
sediments
SPEAR
multielectrode
redox interface
Opis:
Marine sediments with rapid oxic/anoxic transitions are difficult to monitor in real time. Organic overload that may lead to anoxia and buildup of hydrogen sulfide can be caused by a variety of factors such as sewage spills, harbor water stagnation, algal blooms and the vicinity of aquaculture operations. We have tested a novel multiprobe technology (named SPEAR) on marine sediments to evaluate its performance in monitoring sediments and overlaying water. Our results show the ability of the SPEAR probes to distinguish electrochemical changes at 2-3 mm scale and at hourly cycles. SPEAR probes have the ability to identify redox interfaces and redox transition zones in sediments, but do not use micromanipulators (which are cumbersome in field and underwater applications). We propose that the best target habitats for SPEAR-type monitoring are rapidly evolving muddy deposits and sediments near aquaculture operations where pollution with organics stresses the ecosystem.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1037--1041
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of heavy metal pollution in bottom sediments of small water reservoirs with different catchement management
Autorzy:
Podlasińska, J.
Szydłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/101221.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
agriculture
ecology
heavy metals
sediments
ponds
classification
Opis:
The main purpose of this work was to determine the degree of negative impact of heavy metals accumulated in the water sediments to aquatic organisms. Samples of sediments were collected in winter 2013, from 4 layers of sediment (0-5, 5-10, 10-20 and 20-30 cm) at three points along the water reservoir. Sediments were prepared for analysis in accordance with the procedures applied in soil science. The analysis was carried out for the fraction with a particle diameter less than 1 mm. The total content of such elements as Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, was determined by atomic absorption spectrometry (using the Thermo Scientific iCE 3000 series spectrometer) after digestion in a mixture (5:1) of concentrated acid HNO3 (65 %) and HClO4 (60%). The total Hg content was obtained by using the AMA 254 analyzer. Only the lead content in the analyzed samples of bottom sediments exceeded the contamination value given by polish law (the Regulation of the Minister of Environment). According to the classification of PGI samples of sediments are classified mainly as medium polluted sediments (Class II), with the exception of zinc and lead concentrations (Class III). Due to the value of the indicator of sediments ecological risk (Er) for cadmium, the examined sediments from small water reservoirs no. 1 and 2 should be classified as deposits with a higher rate of environmental contamination risk. The sediments from small water reservoirs no. 3 and 4 belong to the class of a much higher index of contamination risk. On the basis of the PER indicator (a degree of potential envi ronmental risk) the sediments from small water reservoirs located within the area of organic farming can be classified as contaminated by heavy metals to a moderate degree. On the other hand, the analyzed sediments of small water reservoirs no. 3 and 4 were classified as deposits with a severe degree of heavy metal contamination. On the basis of the LAW classification one can say that the bottom sediments of examined ponds were classified into different classes depending on the analyzed chemical element.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 987-997
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
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