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Wyszukujesz frazę "mineralisation" wg kryterium: Temat


Tytuł:
Study of Microbiological Processes in the Soil of a Two-Year Fallow
Autorzy:
Malynovska, Iryna
Tkachenko, Mycola
Bulgakov, Volodymyr
Ptashnik, Mykhailo
Ivanovs, Semjons
Powiązania:
https://bibliotekanauki.pl/articles/2202367.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
microbiocenosis
fallow
mineralisation
humus
phytotoxicity
Opis:
A high degree of ploughing the soils is a destabilization factor of agrolandscapes and intensification of the erosion processes. Therefore, there arises a need to study the direction of the soil processes during the transfer of the arable land into a state of fallow. The state of microbiocenosis of a two-year-old abandoned land (fallow) was investigated using the gray forest soil in the variants of spontaneous overgrowth, sowing of grass mixtures and sowing of grass mixtures with simultaneous optimization of mineral nutrition of the phytocenosis as an example. It has been established that the least stable microbiocenosis is formed during the cultivation of the grass mixtures, which is characterized by the minimum total number of microorganisms (647.1 million CFU•g–1 of absolutely dry soil) and the minimum number of significant relations between the constituents (components) of the microbial community (98). The total number of microorganisms in the microbiocenosis of the spontaneous overgrowth variant and the legume-grass mixture exceeds that of the cereal grass mixture variant by 6.29 and 34.8%, respectively. A similar indicator for the total number of significant relations was 4.08%. Application of mineral fertilizers intensifies the process of mineralization of nitrogen compounds and slows down the consumption of the soil organic matter in the variants of sudden recovery of phytocenosis and cultivation of the legume-cereal grass mixture. The soil of the variant of the grass mixture is characterized by minimum total biological activity; it is 1.33 and 33.2% lesser than the total biological activity of the variants of spontaneous overgrowth and cultivation of the legume-grass mixture.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 309--316
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry and tectonic setting of the volcanic host rocks of VMS mineralisation in the Qezil Dash area, NW Iran : implications for prospecting of Cyprus-type VMS deposits in the Khoy ophiolite
Autorzy:
Imamalipour, Ali
Barak, Samaneh
Powiązania:
https://bibliotekanauki.pl/articles/2058590.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geochemistry
massive sulphide mineralisation
IAT
ophiolite
Khoy
Iran
Opis:
The uppermost part of the Khoy ophiolite includes submarine volcanic lavas. These rocks are found as two different types including basaltic pillow lavas and andesitic to andesitic basalt massive-sheet lavas known as the Qezil Dash unit. These last rocks host volcanogenic massive sulphide mineralisation (VMS). Concordant small lenticular massive sulphides associated with widespread stockworks, extensive wall rock alteration and simple mineralogical parageneses are characteristic of this mineralisation. The Qezil Dash lavas are characterized by HFSE depletion (such as in Nb, Zr, and Hf) and LILE enrichment, low Yb, Y and Ni contents and low Zr/Hf and Nb/Ta ratios. These rocks have low Ti contents and are of LKT type. These geochemical characteristics can be interpreted as indicating SSZ magmatism and suggesting that the Qezil Dash rocks belong to an early stage of island arc formation. Geochemically, this host rock is comparable with the Lasail unit, part of a volcanic sequence within the Oman ophiolite. In the Troodos and Oman ophiolites VMS mineralisation has occurred at the contacts of MOR-basalt and island arc tholeiite (IAT) lavas, so prospecting for VMS deposits in the Khoy area should be estabilished based on geochemical investigations of the volcanic rocks and recognition of their field boundaries.
Źródło:
Geological Quarterly; 2019, 63, 3; 435--448
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotopic Re-Os age of molybdenite from the Szklarska Poręba Huta Quarry (Karkonosze, SW Poland)
Autorzy:
Mayer, W.
Creaser, R. A.
Mochnacka, K.
Oberc-Dziedzic, T.
Pieczka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059392.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Karkonosze granite
hydrothermal mineralisation
Re/Os isotopic age
Opis:
New Re/Os isotopic data for molybdenite from the Szklarska Poręba Huta Quarry provide ages of 307 ± 2 Ma and 309 ± 2 Ma, respectively. The quarry is dominated by the porphyritic (“central”) and equigranular (“ridge”) varieties of the Karkonosze granite. Ore mineralisation hosted in aplogranite includes an assemblage of sulphides, sulphosalts, oxides and various rare phases. The molybdenite ages obtained are consistent with a previously published isotopic age of leucogranite (aplogranite?) from the same quarry and are only slightly older than a recently published, refined 2 6Pb/238U age of untreated zircons from the Szklarska Poręba Huta porphyritic granite. The age of the molybdenite corresponds moderately well to the younger stage of post-magmatic, pneumatolitic/hydrothermal activity of the Karkonosze granite (about 312 Ma).
Źródło:
Geological Quarterly; 2012, 56, 3; 505--512
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groundwater Quality Assessment of Hassi Messaoud Region (Algerian Sahara)
Autorzy:
Touahri, Mahmoud
Belksier, Mohamed Salah
Bouselsal, Bouualem
Kebili, Mokhtar
Powiązania:
https://bibliotekanauki.pl/articles/2202243.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Hassi Messaoud
CTM
CTS
CI
potability
irrigation
mineralisation
Opis:
In the Hassi Messaoud region, is groundwater the only source of water to meet daily demands, especially for consumption, domestic needs, industry and irrigation. This study focused on the evaluation of groundwater quality for potability and irrigation supply and the understanding of mineralization processes in the Mio-Pliocene (CTM), Senonian (CTS) and continental intercalary (CI) aquifers. For this study, 38 boreholes were sampled and analyzed for different parameters: pH, EC, TDS and major ions. The assessment of the relevance of groundwater in the study area was tested by the application of the water quality index (WQI) method. The suitability of the water for agricultural use was tested using the parameters of; EC, SAR, Na%, KR, PI and MH. The results illustrate that the groundwater in the study area is grouped into three classes: poor, very poor and unsuitable. Regarding groundwater use in irrigation, the results indicate that the waters of Hassi Messaoud are unsuitable for irrigation according on the EC and Wilcox diagram. The groundwater of the investigated area presents two types of water; Ca-Mg-HCO3 and Ca-Mg-HCO3. The study of the mineralization process of water using the Gibbs diagram and binary diagrams and the indices of saturation showed that the mineralization of water is controlled by the dissolution of evaporites and carbonates, silicate weathering and cation exchange. The participation of anthropic contributions is also noted in the Mio-Pliocene aquifer.
Źródło:
Journal of Ecological Engineering; 2022, 23, 11; 165--178
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The auriferous ore mineralisation and its zonal distribution around the Variscan Kłodzko–Złoty Stok granitoid pluton in the Sudetes (SW Poland) – an overview
Autorzy:
Mikulski, S. Z.
Speczik, S.
Powiązania:
https://bibliotekanauki.pl/articles/2059951.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gold
ore mineralisation
skarn
Variscan granitoids
Kłodzko–Złoty Stok pluton
Sudetes
Opis:
Due to a low level of erosion the Variscan (Carboniferous–Mississippian) Kłodzko–Złoty Stok (KZS) granitoid pluton and its metamorphic rock cover are unique examples of the ore mineralisation distribution pattern around a pluton. The KZS pluton formed from I-type magmas. It is composed mostly of high-K, metaluminous, biotite- and hornblende-rich granitoids of various compositions ranging from granodiorite to monzonite. The ore mineralisation in the KZS shows specific zonation that reflects interaction between post-magmatic mineralising fluids and country rocks of different composition. In the KZS pluton and its surroundings the mineralisation reveals high-temperature Ti-W oxides and As-Fe sulphide-arsenides plus Fe-oxides which are replaced outwards by Cu-Fe-Pb-Zn sulphides and subsequently, in the marginal parts of the pluton, by the Pb-Sb-Fe sulphide mineralisation. The specific elements and the isotopic composition of sulphur in ore minerals indicate that the metal-bearing postmagmatic-metamorphic hydrothermal fluids, despite their strong affinities to the KZS hybrid magmatic fluids, show also an influence of variable composition of country rocks. Variable alteration processes: hornfelsitisation, skarnisation, dolomitisation, serpentinitisation, pyroxenisation, biotitisation, K-feldspatisation, silicification, berezitisation, carbonatisation, prehinitisation, chloritisation, epidotisation, sericitisation, albitisation and sulphidisation developed along contacts of various rock types within the country rocks. In more fractured zones, transported elements were preferentially trapped by calcareous (Ca-rich) metamorphic rocks. Moreover, along the direct contact between granitoids and calcareous rocks a high temperature auriferous skarns with magnetite-pyrrhotite or/and löllingite-arsenopyrite mineralisation were formed. There are positive correlations between organic matter and Fe2O3 and MgO contents in skarns, suggesting remobilization of organic matter by hydrothermal fluids released during serpentinisation. The organic matter and carbonate samples have very variable δ13C and δ18O values. Most probably these are the result of isotopic re-equilibration between minerals under high temperatures. On the intimate contact of granitoids with less permeable amphibolitic hornfelses a high temperature titanite-scheelite mineralisation of veinlet-impregnation type occurred, while thermal and metasomatic alteration of the enveloping more permeable sandstones developed away from direct contact with granites, causing the formation of pyrite-rich beresites. As a rule, different types of sulphide ore mineralisation contain refractory gold captured by arsenopyrite, löllingite and/or pyrite. Moreover, the formation of contact-metasomatic ore mineralisation was accompanied by ore precipitation in veins and stockworks at a wide temperature range from 480 to 150°C during early and late fracturing stages. The younger stages also revealed variable concentration of gold. All those observations strongly indicate that the whole KZS pluton and its aureole was fertile in gold.
Źródło:
Geological Quarterly; 2016, 60, 3; 650--674
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neoproterozoic flood basalts of the upper beds of the Volhynian Series (East European Craton)
Autorzy:
Białowolska, A.
Bakun-Czubarow, N.
Fedoryshyn, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2059908.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Volhynian Series
Ratno Beds
flood basalts
fractional crystallisation
liquation
palagonite
copper mineralisation
Opis:
The effusive rocks of the Ratno Beds of the Volhynian Series known from the western slope of the Ukrainian Shield are represented by lower Vendian flood basalts whose normative composition is that of quartz tholeiites. These are plagioclase-pyroxene basalts displaying intergranular, intersertal, doleritic, ophitic and amygdaloidal textures; they range from aphanitic to medium-grained and contain about 7 vol. % of palagonite - an altered glass with a high iron and considerable magnesium content. The range in composition of plagioclases (andesine-bytownite) and clinopyroxenes (augite-ferropigeonite) suggests that the Ratno Beds basalts formed by fractional crystallisation of a parent magma. Residual magma underwent liquation, producing a separate acid glass (69-73 wt. % of SiO2) phase within a basic one considerably poorer in SiO2 but rich in iron and magnesium. The Ratno Beds basalts are relatively rich in silica, iron, titanium and vanadium as well as in REE and LREE in particular but poor in Ni, Co and Cr. Normative composition, geochemical characteristics and tectonic position suggest classification as continental quartz tholeiites. Hydrothermal solutions are responsible for rich native copper mineralisation in basalts of certain parts of Volhynia (Ivance and Policy). The Vendian volcanism of the Volhynian Series lithologically correlated with the Sławatycze Series of eastern Poland, can be related to continental rifting accompanying the breakup of Rodinia, with crustal fractures mainly running concordantly with the suture zone between Fennoscandia and Sarmatia, thus almost perpendicular to the Tornquist rift; other fracture trends may also have controlled Vendian volcanism.
Źródło:
Geological Quarterly; 2002, 46, 1; 37-58
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie stężenia węgla organicznego w wodzie gruntowej w różnie użytkowanych glebach torfowych
Variability of organic carbon concentrations in ground water of differently used peat soils
Autorzy:
Nadany, P.
Sapek, A.
Powiązania:
https://bibliotekanauki.pl/articles/337904.pdf
Data publikacji:
2004
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
mineralizacja
temperatura
torf
warunki wodne
mineralisation
temperature
peat
water regime
Opis:
Degradacji torfów towarzyszy obniżanie powierzchni torfowiska w wyniku utraty masy organicznej. Wieloletnie obserwacje prowadzone przez ZDMUZ Biebrza na torfowisku Kuwasy dowodzą, że powierzchnia torfowiska może obniżać się od 0,7 do ponad 1,5 cm rocznie. Zanikanie takiej ilości masy organicznej wiąże się z przenikaniem znacznych ładunków rozpuszczalnego węgla organicznego (RWO) do wody gruntowej, a następnie powierzchniowej, z którą może być on wynoszony z obiektu. Celem niniejszej pracy było zbadanie wpływu temperatury oraz poziomu wody gruntowej na obserwowane, zarówno w czasie, jak i przestrzeni, zróżnicowanie stężenia węgla organicznego w wodzie gruntowej na terenach torfowisk, które w różnym stopniu zostały przekształcone przez człowieka i warunki środowiskowe. Prace prowadzono na torfowiskach doliny Biebrzy gdzie wyodrębniono trzy, zróżnicowane pod względem warunków wodnych i glebowych, obiekty. Z przeprowadzonych badań wynika, że stężenie węgla organicznego w wodzie gruntowej użytkowanych i nieużytkowanych torfowisk jest zróżnicowane, a także, że istnieje związek intensywności uwalniania rozpuszczalnych form węgla z torfu do wody z warunkami hydrotermicznymi.
Peat degradation is accompanied by the subsidence of peat surface due to the loss of organic matter. Long-term observations carried out in the Experimental Station of Reclamation and Grassland Farming in Biebrza (the Kuwasy peatland) showed that the subsidence might vary from 0.7 to 1.5 cm annually. Disappearance of that amount of organic matter is followed by the transport of large loads of dissolved organic carbon to ground and then to surface waters through which it is removed from the object in question. This work was aimed at studying the effect of temperature and ground water table depth on observed (both spatial and temporal) differentiation of organic carbon concentration in ground waters of peatlands which had been transformed by various human activity and natural processes. The study was carried out in peats of the Biebrza Valley in three objects of distinctly different water and soil properties. The study revealed different concentration of organic carbon in ground water of used peatlands as compared with that in unused peatlands and a relationship between the intensity of dissolved organic carbon release from peat and hydrothermal conditions.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2004, T. 4, z. 2b; 281-289
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organic and inorganic geochemical study of the Lower Permian Walchia shale of the Intrasudetic Basin (SW Poland)
Autorzy:
Bilkiewicz, E.
Pieczonka, J.
Piestrzyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060412.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Intrasudetic Basin
Walchia shale
organic matter
uranium
base metal mineralisation
Opis:
The Lower Permian Walchia shale of the Intrasudetic Basin is lacustrine sediment enriched in organic matter and base metals. Rock-Eval geochemical analysis was conducted on 110 drill-core rock samples of the Walchia shale in order to characterize the quantity, genetic type and maturity of dispersed organic matter. Concentrations of U, Th, Cu, Ni, V, Pb, Zn, Co, Mo, Cr, P, S and Fe were determined and microscopic studies to recognize mineral composition were performed on selected samples. Organic matter of the Walchia shale is immature and dominated by terrestrial type III kerogen with an admixture of planktonic type II kerogen. The Walchia shale is generally poor source rock, but some parts of the profile exhibit good and even excellent hydrocarbon potential. The average concentrations of analysed metals are higher than the average reported for black shales. The concentrations of base metals do not correlate with TOC contents, suggesting that their presence is associated with inorganic features of the Walchia shale or they could have been related primarily to organic matter which was subsequently oxidized and altered. Uranium may be partly associated with phosphates. Results of microscopic investigations revealed the lack of detectable radioactive minerals, abundance of framboidal pyrite, and prevalent galena, sphalerite and chalcopyrite.
Źródło:
Geological Quarterly; 2018, 62, 3; 631--643
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktury koliste Sudetów i bloku przedsudeckiego jako perspektywiczne rejony występowania mineralizacji rudnej, na przykładzie struktury Damian w rejonie Gniechowic, SW do Wrocławia
The circular structures in the Sudetes mountains and foresudetic block as a potential zones of ore mineralisation, the Damian circular structure near Gniechowice, SW of Wrocław case history
Autorzy:
Kwaśny, L.
Korzekwa, W.
Powiązania:
https://bibliotekanauki.pl/articles/170622.pdf
Data publikacji:
2011
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
Sudety
mineralizacja rudna
struktura Damian
struktury koliste
Sudetes
ore mineralisation
Damian structure
circular structure
Opis:
Celem przeprowadzonych prac było przetestowanie zarówno metod badawczych służących rozpoznaniu struktur kolistych na bloku przedsudeckim jak i różnego rodzaju badań, pozwalających z większym prawdopodobieństwem ocenić zasadność poszukiwań stref występowania złóż rud metali w takich rejonach. Wstępny etap prac objął wytypowany obszar w rejonie stosunkowo niewielkiej, ale bardzo wyraźnej anomalii, nazwanej strukturą kolistą Damian. Anomalia magnetyczna o średnicy fftoło 3 km, występująca 10 km na południowy-zachód od Wrocławia odkryta została już ponad 20 lat temu w wyniku analizy materiałów archiwalnych i zdjęć satelitarnych. Przeprowadzone uszczegółowione badania wykazały, że skały podatne magnetycznie zalegają na analizowanym obszarze stosunkowo płytko, zwłaszcza w zachodniej części struktury. Stwierdzono zbieżność ukształtowania stropu podłoża podkenozoicznego, rozpoznanego w oparciu o badania elektrooporowe, z zarysem struktury rozpoznanej badaniami magnetycznymi. Wyraźne obniżenie w części centralnej koresponduje z występowaniem skał niepodatnych magnetycznie. Przeprowadzone powierzchniowe analizy geochemiczne pozwoliły stwierdzić, że w rejonie analizowanej struktury występują anomalie kompleksowe zawartości Zn, Pb, Cu, Ag, Co i As, przy wysokiej korelacji zawartości tych pierwiastków. W nawiązaniu do usytuowania kolistej struktury w stosunku do regionalnych jednostek krystalicznego podłoża wschodniej czębloku przedsudeckiego, założono, że anomalia ta może być wywołana występowaniem nierozpoznanego dotąd wierceniami, Stosunkowo niewielkiego ciała intruzywnego, występującego na głębokościach rzędu 50-100 m. Z przeprowadzonego dotychczas rozpoznania najbardziej prawdopodobne wydaje się powiązanie struktury „Damian" z lokalną intruzją kwaśnej magmy, występującą w strefie węzła tektonicznego. Wykonana analiza nie pozwala jednoznacznie stwierdzić, czy w rejonie analizowanej struktury występuje strefa mineralizacji rudnej, szereg przesłanek wynikających z przeprowadzonych badań geofizycznych i geochemicznych wskazuje jednak na zasadność wykonania na tym obszarze wierceń badawczych.
The main purpose of study was to test research methods suitable for recognition of ring structures in Foresudetic Block and methods which could confirm the legitimacy to ore deposits prospecting in areas covered by Cenozoic deposits. The area with relatively small but very distinct circular magnetic anomaly, named the "Damian " structure, has been chosen for the preliminary stage of the researches. The magnetic anomaly with diameter circa 3 km which occurs about 10 km SW from Wrocław has been discovered above 20 years ago as the result of the analysis of archival materials and satellite images. More detailed magnetic measurements have showed that magnetically susceptible rocks occur in the analysed area at relatively shallowly depth, especially in the west part of the ring structure. It has been stated that the shape of the sub-Cenozoic surface recognized by eleckoresistivity measurements refers to the outline of the magnetic anomaly structure. The distinct depression in the central part of the structure corresponds to the zone of magnetically unsusceptible rocks. Soil geochemical sampling reveals thecomplex anomaly contents of Zn, Pb, Cu, Ag, Co and As locally found with relatively high correlation between some of these elements, fhe relation of the analysed structure to the regional tectonic and structural units shows that the circular anomaly is caused probably by intrusive body, comparatively small at a depth about 50-100 m, so far unrecognized by drillings The local intrusion of an acid magma in the area of tectonic junction seems to be the most probable explanation for the "Damian " ring structure, studies in the area of the circular structure have not showed as yet the direct evidences for the occurrence of ore deposits but the correlation of many signs legitimates the further researches with reconnaissance drillings in this region.
Źródło:
Górnictwo Odkrywkowe; 2011, 52, 1-2; 73-79
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry and ore potential of the Almoughlagh batholith, western Iran
Autorzy:
Zamanian, Hassan
Asadollahi, Behrooz
Powiązania:
https://bibliotekanauki.pl/articles/94586.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Fe-skarn mineralisation
Almoughlagh batholith
metaluminous
geochemistry
skarn ore potential
Baba Ali pluton
geochemia
Baba Ali
Almoughlagh
Opis:
The Almoughlagh batholith intruded the dioritic Baba Ali pluton during the Oligo-Miocene; the pluton and is now exposed as a big enclave within the batholith. The pluton intruded the Songhor Series during the Late Kimmeridgian (~136 Ma) orogeny. The intrusion by the batholith transformed the diorite to metadiorite and the impure carbonate units of the Songhor Series. The batholith consists of rock types such as quartz syenite and syenogranite, which have a low average quartz content, and which are metaluminous to peraluminous and calc-alkaline in composition. Comparison of the compositions of the Almoughlagh batholith and the pluton with its Cu, Mo, Fe, Sn, W, Au, and Zn skarn deposits, indicates that the Baba Ali diorite geochemically shows much resemblance with those which could bring about Fe-Cu skarn mineralization, whereas the compositions of the Almoughlagh granitoids resembles those of the plutons associated with Mo and Zn skarn deposits. The associated hydrothermal activity related to the Almoughlagh batholith culminated in magnetite mineralisation in the Baba Ali and the Chenar mines in which copper mineralisation also is considerable.
Źródło:
Geologos; 2013, 19, 3; 229-242
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł

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