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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of acid buffering capacity on the remobilization of heavy metals in sewage sludge barrier for tailings
    Autorzy:
    Chen, Y.
    Zhang, H.
    Ju, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/205048.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sewage sludge
    heavy metals
    acid mine drainage
    acid buffering capacity
    remobilization
    Opis:
    Remobilization of heavy metals from the bottom liner system due to the seepage of acid mine drainage (AMD) is an important concern in the long-term management of tailing impoundment. Titration tests were carried out to evaluate the acid buffering capacity (ABC) of sewage sludge and to investigate its effect on the remobilization of heavy metals. Test results demonstrate that the ABC increases with solid/liquid ratio and anaerobic incubation time and it is mainly attributed to the abundant organic matters contained and increasing carbonate loads. The added heavy metals (Zn, Pb, and Cu) were well immobilized during the anaerobic incubation stage but were released out dramatically during the acidification especially when pH drops below 6.0 because of dissolution of carbonates and cation exchange of clay minerals. The calculated results, from a simplified model, indicate that high levels of remobilization of heavy metals are not expected during the typical management time because of the high ABC of compacted sewage sludge barrier. These results support that sewage sludge is a suitable bottom liner material for the management of AMD from tailings.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 2; 62-72
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of gluconic acid secretion by phosphate-solubilizing Pseudomonas putida bacteria on dissolution of pyromorphite Pb5(PO4)3Cl and Pb remobilization
    Autorzy:
    Topolska, J.
    Borowicz, P.
    Manecki, M.
    Bajda, T.
    Kaschabek, S.
    Merkel, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191216.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    pyromorphite
    pseudomonas putida
    gluconic acid
    Pb remobilization
    P-induced method
    Opis:
    The purpose of this study was to investigate the effect of bacterially produced gluconic acid on the dissolution of pyromorphite and Pb remobilization. Pyromorphite Pb5(PO4)3Cl is formed as a product of the phosphate-induced treatment of Pb-contaminated sites. This very stable mineral greatly decreases the bioavailability of Pb. In this study, bacterial and abiotic batch experiments on the dissolution of pyromorphite were carried out. In the microbial experiments, the mineral was dissolved in the presence of the phosphate–solubilizing soil bacterium, Pseudomonas putida. The bacterial growth medium was supplemented with glucose, which under natural condi- tions can be supplied to microbes via symbiosis with plants. P. putida acquired P from pyromorphite and enhanced its dissolution. Elevated Pb concentrations were observed in the suspensions with bacteria. The bacterial secretion of 16.5 mM gluconic acid played a significant role in Pb remobilization; the pH of the solution dropped down from an initial 7.4 to 3.5. In the abiotic experiments, pyromorphite was dissolved at several concentrations of gluconic acid and at an acidic to neutral pH range. Both acidification and formation of stable Pb-gluconate ligands enhanced the dissolution of pyromorphite and caused Pb remobilization.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2013, 83, 4; 343-351
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proteolytic activity and nitrogen remobilisation in senescing leaves of phenological forms of Fagus sylvatica
    Autorzy:
    Kraj, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/41003.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    proteolytic activity
    nitrogen remobilization
    leaf senescence
    phenological form
    peptidase
    protein
    phenology
    Fagus sylvatica
    beech
    Opis:
    Leaf senescence allows plants to remobilise and use the same nitrogen repeatedly and is closely linked to autumn phenology. The timing of leaf senescence affects the growth rate and survival of trees due to the association between senescence and the remobilisation of nutrients, particularly nitrogen. The present study compares protein degradation dynamics and nitrogen remobilisation in early, intermediate and late phenological forms of beech trees (Fagus sylvatica L.). Specimens of phenological forms were marked and examined in 2005 and 2008. Leaf samples were collected from August to October during each of these years, and a biochemical analysis and a determination of proteolytic enzyme activity were conducted. The early phenological form showed protein degradation with three clearly indicated phases, whereas in the late form, protein degradation was stable with a constant decrease. The phenological forms differed significantly in their C/N ratios, which increased from approximately 20 in August to 37.5, 35 and 32 for the early, intermediate and late forms, respectively, at the end of leaf senescence. The date of the sudden drop in temperature had a decisive effect on the beginning of leaf senescence. Temperature has a greater effect on protein degradation and the protein and nitrogen resorption efficiency in the early form than in the late form. The trees that began to senesce the earliest exhibited the highest resorption of nitrogen compounds. Senescence led to an increase in proteolytic activity. Aminopeptidase activity was highest at the beginning of senescence, while endo- and carboxypeptidase activity was highest in the middle of senescence. The early form had the highest activity levels for all peptidase types. These results indicate that beech trees that differ in their autumn senescence timing display different nitrogen remobilisation efficiencies. This efficiency depended on the length of leaf senescence, peptidase activity and the sensitivity of particular phenological forms to temperature changes.
    Źródło:
    Dendrobiology; 2014, 72
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mercury fluxes through the sediment water interface and bioavailability of mercury in Southern Baltic Sea sediments
    Autorzy:
    Beldowski, J.
    Miotk, M.
    Pempkowiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/49177.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    speciation
    sediment
    remobilization
    Baltic Sea
    bioavailability
    mercury
    toxic metal
    Opis:
    Sediment cores collected in several areas of the southern Baltic were analysed for total mercury (HgTOT) and five operationally defined mercury fractions: HgA – contained in pore waters, HgF – bound to fulvic acids, HgH – bound to humic acids, HgS – bound to sulphide, and HgR – residual. An effort was made to quantify mercury fluxes at the sediment/water interface in the study area. Net mercury input, calculated on the basis of sedimentation rate and concentration in the uppermost sediments, ranged from 1 to 5.5 ng cm−2 year−1. Mercury remobilisation from sediments due to diffusion and resuspension was calculated from the proportion of labile mercury and the velocity of near-bottom currents. The results showed that the return soluble and particulate fluxes of mercury from the sediments to the water column constitute a substantial proportion of the input (20–50%), and are slightly higher than those found in pristine areas, although they are less than the values recorded in areas with a history of mercury contamination. In addition, an index was developed to assess the methylation potential of mercury in sediments. Mercury contained in pore waters, and mercury bound to fulvic and humic acids together with Loss on Ignition were used to calculate the semiquantitative methylation potential (Pm). Despite the simplicity of this approach, Pm correlates well with methyl mercury in fish from the study area.
    Źródło:
    Oceanologia; 2009, 51, 2; 263-285
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology of extensor digitorum longus of Wistar rats after remobilization by vibratory platform
    Autorzy:
    Camilo, Izabela Rodrigues
    Wutzke, Maria Luiza Serradourada
    Costa, Rose Meire
    Bertolini, Gladson Ricardo Flor
    Ribeiro, Lucinéia de Fátima Chasko
    Powiązania:
    https://bibliotekanauki.pl/articles/454965.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    immobilization
    skeletal muscle
    vibration
    Opis:
    Introduction. In exercise, vibrations are performed in order to produce rapid and short changes in muscle length. These changes are detected by sensory receptors, in response try to dampen the vibratory waves through a modulation of muscle stiffness. However, its effects on the morphology of muscle tissue are still not fully established, especially after long periods of immobilization. Aim. To compare the effects of the vibratory platform on the remobilization of the extensor digitorum longus (EDL) muscle of Wistar rats with free remobilization. Material and methods. 20 rats were divided into: CG (Control), IG (immobilized), IFG (immobilization and free remobilization), IPG (immobilization and remobilization with vibratory platform). The immobilization was performed on the pelvic limb for 15 days. The remobilization with vibratory platform was done for 10 minutes daily, for 2 weeks. The EDL was processed for histological analysis of cross-sections. Results. The area, larger diameter, smaller diameter and fiber density of the EDL muscle of GI presented significant alteration when opposed to CG, IFG and IPG. The density of nuclei of the EDL muscle of IG presented a significant increase when opposed to the others, and IPG also presented a significant increase when compared to CG. Conclusion. The morphology and morphometry of the EDL muscle tissue were affected, and both free and vibration platform remobilization re-established the morphological aspects of the muscle fiber, without significant differences between the methods.
    Źródło:
    European Journal of Clinical and Experimental Medicine; 2019, 4; 295-300
    2544-2406
    2544-1361
    Pojawia się w:
    European Journal of Clinical and Experimental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluxes of nitrogen within deciduous fruit trees
    Przepływy azotu wewnątrz drzew owocowych klimatu umiarkowanego
    Autorzy:
    Tagliavini, M.
    Millard, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/11364496.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    nitrogen remobilization
    nitrogen nutrition
    nitrogen flux
    shoot-root-shoot nitrogen recycling
    fruit tree
    nitrogen storage
    fruiting
    growth
    Opis:
    Nitrogen (N) nutrition is a major means of controlling growth and fruiting of trees. In EU Countries, society’s expectations and political decisions have pushed for the adoption of sustainable ways to manage orchards. Guidelines for N management aim to limit fertiliser applications under threshold limits, in order to reduce N losses. Increasing the effectiveness of the recycling of the N present in the orchard is a basic step to reduce external N inputs. The availability of the stable isotope ¹⁵N as experimental tool has made possible significant advances in the knowledge of the fluxes of N at tree and orchard level. This paper discusses the N fluxes occurring within the tree both between the years and within the year (root-shoot-root N recycle) and their role in the vegetative and reproductive cycle of fruit trees.
    Odżywianie azotem (N) stanowi główny czynnik kontrolujący wzrost i owocowanie drzew. W krajach UE oczekiwania społeczeństwa i decyzje polityczne wymuszają przyjęcie odnawialnych sposobów prowadzenia sadów. Wskazania odnośnie gospodarki azotem są nakierowane na zastosowanie nawozów w progowych dawkach, w celu zredukowania strat N. Wzrost efektywności obiegu N obecnego w sadzie stanowi podstawowy krok w kierunku ograniczenia zewnętrznego wkładu. Zastosowania izotopu ¹⁵N jako narzędzia doświadczalnego umożliwiło znaczny postęp w poznaniu przepływów azotu w obrębie drzew i w ogóle w sadzie. W pracy dyskutowane są przepływy N wewnątrz drzewa – pomiędzy latami i w obrębie roku (obieg korzenie–pędy–korzenie) oraz ich znaczenie dla cykli wzrostowych i reprodukcyjnych drzew owocowych.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2005, 04, 1; 21-30
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ti remobilization and sulphide/sulphoarsenide mineralization in amphibolites: effect of granite intrusion (the Karkonosze–Izera Massif, SW Poland)
    Autorzy:
    Mochnacka, K.
    Oberc-Dziedzic, T.
    Mayer, W.
    Pieczka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059096.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Karkonosze granite
    Ti mineralization
    hydrothermal sulphide/sulphoarsenide mineralization
    contact metamorphism
    Opis:
    Our studies focus on ore mineralization in a contact-metamorphic aureole, using the Variscan Karkonosze Granite pluton as an example. The Karkonosze in trusion is enveloped by an Early Palaeozoic (about 500 Ma) metamorphic complex of the Izera–Kowary Unit composed of a diverse assemblage of gneisses, granitic gneisses, schists, amphibolites and marbles. The Budniki ore mineralization site was discovered in the early 1950's at the SE margin of the pluton. The uneconomic Ti-ox ide/sil i cate, Fe-Cu-Ni-Co-sulphide-sulphoarsenide, and uranium mineral deposits are hosted within amphibolites which were subjected to regional metamor phism fol lowed by contact meta - morphism. The Ti mineralization includes an ilmenite-titanite assemblage that originated from regional-metamorphic transformation of igneous Ti-bearing minerals, such as ilmenite and tschermakite, of the basic protoliths of amphibolites. During subsequent contact metamorphism, ilmenite was decomposed and, after wards, Al-rich titanite and rutile were formed. The Ti remobilization was coeval with an early stage of superimposed Fe-Cu-Ni-Co-sulphide/sulphoarsenide mineralization (pyrrhotite, pyrite, pentlandite, arsenopyrite, chalcopyrite, sphalerite and Fe-Ni-Co-As-S phases), related to the activity of the Karkonosze Granite hydrothermal system. The ore minerals formed successively within a wide range of temperatures (625–250gradeC).
    Źródło:
    Geological Quarterly; 2008, 52, 4; 349-349
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Histological aspects of whole-body vibration in the knee remobilization of Wistar rats
    Autorzy:
    da Costa, Juliana Roncini Gomes
    Tavares, Alana Ludemila de Freitas
    Bertolini, Gladson Ricardo Flor
    Wutzke, Maria Luiza Serradourada
    Boaro, Carolina De Toni
    Rodriguez, Diego Francis Saraiva
    Costa, Rose Meire
    Ribeiro, Lucinéia de Fátima Chasko
    Powiązania:
    https://bibliotekanauki.pl/articles/2054522.pdf
    Data publikacji:
    2022-06-30
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    articular cartilage
    knee
    synovial membrane
    vibration
    Opis:
    Introduction and aim. The knee is one of the joints where immobilization is most used, however, it can cause morphological changes in the joint tissues and is a challenge to be overcome during rehabilitation. Whole-body vibration (WBV) is capable of generating repetitive oscillatory movements, which cause mechanical stimuli that interfere with tissue plasticity. The aim of this study was to analyze the knee morphology of Wistar rats submitted to remobilization with WBV. Material and methods. 32 male rats were used, divided into four groups (n=8): Control Group (G1), Immobilization Group (G2), Immobilized Group and Free Remobilization (G3), Remobilized Group with WBV (G4). For immobilization, a plastered apparatus was used for 15 days. G3 and G4 carried out free remobilization or with WBV, respectively, for 2 weeks. The knee joints were processed for light microscopy. Results. The WBV led to a reduction in the inflammatory infiltrate in the articular cavity and greater presence of adipocytes in the subintima of the synovial membrane. Conclusion. Remobilization with WBV induced a better tissue response in the synovial membrane when compared to free remobilization.
    Źródło:
    European Journal of Clinical and Experimental Medicine; 2022, 2; 159-166
    2544-2406
    2544-1361
    Pojawia się w:
    European Journal of Clinical and Experimental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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