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Tytuł:
Sulfate permeases - phylogenetic diversity of sulfate transport
Autorzy:
Piłsyk, Sebastian
Paszewski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1040522.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
sulfate permeases
sulfate transporters
Opis:
Sulfate uptake, the first step of sulfate assimilation in all organisms, is a highly endoergic, ATP requiring process. It is under tight control at the transcriptional level and is additionally modulated by posttranslational modifications, which are not yet fully characterized. Sulfate anion is taken up into the cell by specific transporters, named sulfate permeases, located in the cell membrane. Bacterial sulfate permeases differ significantly from the eukaryotic transporters in their evolutionary origins, structure and subunit composition. This review focuses on the diversity and regulation of sulfate permeases in various groups of organisms.
Źródło:
Acta Biochimica Polonica; 2009, 56, 3; 375-384
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histological changes following the administration of two different chondroitin sulfate products in experimental osteoarthritis models in rats
Autorzy:
Nosivets, Dmitriy
Montell, Eulalia
Opryshko, Valentine
Powiązania:
https://bibliotekanauki.pl/articles/2040156.pdf
Data publikacji:
2021-03-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
chondroitin sulfate
chondroprotection
osteoarthritis
Opis:
Introduction. Osteoarthritis (OA) is generally a progressive disease that affects synovial joints, resulting in abnormalities to articular cartilage subchondral bone, synovium, and adjacent soft tissues. Aim. The purpose of this work was to examine the histological changes in knee cartilage and bone following the administration of two different chondroitin sulfate products in two experimental OA models in rats. Material and methods. OA was induced in rats by either a single injection of mono-iodoacetate or four once-weekly injections of dexamethasone. 70 adult rats were included: 30 received mono-iodoacetate, 30 received dexamethasone and the 10 remaining controls received no injection. Samples of knee bone and cartilage were then analyzed histologically. Results. Animals with OA that received CS had significantly less inflammation, improved motor activity, and better analgesia compared with those that did not receive CS, with little difference between products. Histologically, both products reduced the signs of OA and resulted in the activation of regenerative processes of cartilage and bone and stimulation of proliferation and formation of amorphous material. Conclusion. These results substantiate the importance of using high-quality pharmaceutical-grade CS to ensure optimal efficacy and safety of the final product in patients with OA
Źródło:
European Journal of Clinical and Experimental Medicine; 2021, 1; 23-32
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative technology for recovery of zinc, lead and silver from zinc leaching residue
Autorzy:
Zheng, Y.-X.
Lv, J.-F.
Liu, W.
Qin, W.-Q.
Wen, S.-M.
Powiązania:
https://bibliotekanauki.pl/articles/110688.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
zinc leaching residue
lead sulfate
zinc sulfate
reduction roasting
flotation
Opis:
Zinc leaching residue is a good source of zinc and has a great potential to be utilized. However, it is very difficult to recover lead, zinc and silver from the residue by traditional technologies. In this study, a new technology based on conversions of PbSO4 and ZnSO4 in the residue to their respective sulfides by reduction roasting with coal powder followed by a flotation treatment was developed. The effects of roasting temperature, coal dosage, reaction time and pyrite dosage were investigated at a laboratory scale. The results showed that the conversion extent of PbSO4 and ZnSO4 under the optimal experimental conditions was 71.89 and 69.76%, respectively. A flotation concentrate containing 39.13% Zn, 6.93% Pb and 973.54 g/Mg Ag was obtained from the treated material, and the recovery of Zn, Pb and Ag was 48.38, 68.23 and 77.41%, respectively. The tailing containing ZnFe2O4 or Fe3O4 could be either stockpiled or further disposed.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 943-954
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of sulfate-reducing bacteria and different organic fertilizer for bioremediation of ex-nickel mining soils
Autorzy:
Bakhtiar
Sukoso
Saida
Powiązania:
https://bibliotekanauki.pl/articles/35552128.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
organic matter
pH
sulfate
nickel
Opis:
The microbiological activity associated with exmining soil remediation can be considered useful to accelerate the contaminant degradation. The use of sulfate-reducing bacteria (SRB) and organic matter exhibits potential in improving ex-nickel mining soil quality. The purpose of this study was to examine the ability of SRB in several organic fertilizers to reduce sulfate and nickel ions, and to increase pH of soil from nickel in mining areas. This study used the bacteria collection of the Soil Laboratory of the Faculty of Agriculture, Universitas Muslim Indonesia. Those were previously isolated from two cultivating pond of milkfish in the Kuri area of Maros Regency, South Sulawesi, Indonesia. The soil samples were collected from ex-mining areas of the Vale Indonesia Enterprise in Soroako, South Sulawesi, Indonesia. Those were mixed with organic fertilizers, generated from sugarcane sludge, manure, and Quickstick (Gliricidia sepium) leaves, each with 50 and 100 g doses. The 5 kg soil samples were put into a pot and mixed evenly with organic fertil- izers. A general linear model (GLM) repeated measures analysis of variance (ANOVA) was adopted to analyze the data. The results of this study indicate that the application of SRB and fertilizer was effective in reducing concentration of sulfate and nickel. Among the three types of organic fertilizers, manure was effective in reducing sulfate and nickel concentrations, while Quickstick fertilizer was the more effective in stabilizing pH level. Fertilizer doses exhibited a significant effect on decreasing sulfate and nickel concentrations, but it exhibited no significant effect on stabilizing pH levels. At 10 days after treatment (DAT), the sulfate concentration decreased from 2,530 ppm to 1,443 ppm in treatment of SRB and manure with dose of 50 g and 1,363 ppm with that of 100 g. At the end of the observation (30 DAT), those were decreased to 1,217 ppm in treatment of SRB and manure with doses of 50 g and 1,167 ppm with that of 100 g. Among the three types of organic fertilizers used, Quickstick demonstrates the more effective reduction rate. At 10 DAT, pH increased in SRB treatment by 7.06 at a concentration of 50 g and 7.01 at a concentration of 50 g. At the end of the observation (30 DAT), the pH became 6.67 at a concentration of 50 g and 6.82 at a concentration of 50 g. The nickel concentration decreased from an origin concentration to 1,950 ppm in treatment of SRB and manure with doses of 50 g and 1,690 ppm with that of 100 g. Thus, the application of manure fertilizer and the addition of SRB is recommended for bioremediation of sulfate and nickel from ex-mining soil.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 4; 561-572
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of temperature in removing of anions in solution on biochar using Zea mays stalks as a precursor
Autorzy:
Villabona-Ortiz, Ángel
Tejada-Tovar, Candelaria
Ortega-Toro, Rodrigo
Powiązania:
https://bibliotekanauki.pl/articles/1841960.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
adsorption
biochar
cornstalks
nitrate
sulfate
phosphate
Opis:
Biochar was prepared from corn (Zea mays) stalks and impregnated with sulfuric acid. The biomass was impregnated for 24 h with a 50% solution of H2SO4 with impregnation ratios 1:2 (B 1:2) and 1:3 p/v (B 1:3); then, it was carbonized in a muffle furnace at 520°C for 30 min with a 10°C per min ramp. The adsorption capacity to remove anions (nitrate, sulfate, and phosphate) in an aqueous solution was evaluated by varying the temperature. The adsorption mechanism was studied by determining the thermodynamic parameters: Gibbs free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) standard. The biochars were characterized by Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS) analysis and were found to exhibit a heterogeneous surface and porous nature, with C, O, S, and Si. The experiments in the batch system showed the best performance of B 1: 2 in the removal of the three anions occurred at 303 K, while B 1: 3 had the best performance at 298 K. From the thermodynamic parameters, it was found that the removal processes are endothermic, their mechanism is by chemisorption. It is concluded that synthesized biochar is an excellent alternative to removing nutrient anions present in the solution.
Źródło:
Journal of Water and Land Development; 2021, 50; 64-68
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Sulfate in the Sand on the Absorption and Density of Metakaolin-Based Geopolymer Mortar
Autorzy:
Thamer, Sara Yahya
Al-Jaberi, Layth Abdulbari
Powiązania:
https://bibliotekanauki.pl/articles/2202341.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
geopolymer
sulfate
molarity
alkaline liquid
absorption
Opis:
The advancement of cement alternatives in the construction materials field is fundamental to sustainable development. Geopolymer is the optimal substitute for ordinary portland cement, which produces 80% less CO2 emissions. Metakaolin was used as one of the raw materials in the geopolymerization process. This research examined the influence of three different percentages of sulfate (0.00038, 1.532, and 16.24)% in sand per molarity of NaOH on the absorption and density of metakaolin-based geopolymer mortar (MK-GPM). Samples were prepared with two different molarities (8M and 12M) and cured at room temperature. The best results obtained for geopolymer mortar in the absorption and density test were (3.89%) and (2280 kg/m3), respectively, recorded with 12M with the lowest sulfate content (0.00038%) at 90 days. Moreover, it has been observed that the absorption percentage increased along with sulfate content in the sand, and an inverse relationship was recorded between the increasing sulfate percentages in the sand and density values of (MK-GPM).
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 328--335
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical study of precipitates in the architectural surfaces from Bern, Switzerland
Autorzy:
Huber, Miłosz Andrzej
Hałas, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/763337.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
precipitates
sulfate
geochemistry
pollution
microscopy
isotope analysis
Opis:
This geochemical study aims to resolve genesis of precipitation spots on the walls on the Nydeggbrücke in Bern, Switzerland. The bridge is composed of Jurassic limestone and dolomites and coated on both sides with Miocene flysch sandstone. As a result of infiltration of aqueous solutions derived directly from the road embankment into the sandstone, sulfate encrustation on the walls of sandstone has been formed.The study of these precipitates using optical and electron microscopy clearly shows dominant sulfate phases are gypsum (calcium sulfate), mirabilite (sodium hydrated sulfate) and polyhalite (potassium, calcium and magnesium sulfate). Impurities of Ni, Cu, Zn and Pb was encountered by ICP-MS analysis. Identified polymetallic mineralization is associated with the infrastructure of the bridge and the accumulation of pollution from vehicular traffic. This is also confirmed by sulfur and oxygen stable isotope analyses of sulfates.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica; 2015, 70
0137-6861
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Unithiol on the Liver in the Conditions of a Mechanical Injury Against the Background of Poisoning by Zinc and Copper Salts
Wpływ unithiolu na wątrobę w warunkach urazu mechanicznego na tle zatrucia solami cynku i miedzi
Autorzy:
Melnyk, Nataliia
Fedoriv, Olha
Kopach, Oleksandra
Powiązania:
https://bibliotekanauki.pl/articles/2159217.pdf
Data publikacji:
2022-12-30
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
Unithiol
zinc sulfate
copper sulfate
bile acids
injury
wounds
siarczan cynku
siarczan miedzi
kwasy żółciowe
uraz
rany
Opis:
Background. The aim of the study was to find out the influence of excess copper and zinc ions in drinking water on the bile-forming and bile-secreting functions of the liver in the conditions of mechanical trauma and the effectiveness of the antidote therapy. Material and methods. The experiments were performed on 60 Wistar strain male rats weighing 180-200 g. There were 3 groups of experimental animals in the experiment: 1 group – only skeletal trauma was simulated; 2 group – a skeletal injury was simulated and zinc and copper salts were administered; 3 group – skeletal trauma + zinc and copper salts followed by Unithiol treatment. Results. In the late period of traumatic illness (14-28 days), after a severe skeletal injury, the intensity of bromsulfalein increased in the liver tissue, and there were signs of increased formation of direct bilirubin in terms of additional intake of copper and zinc ions. The animals with severe skeletal trauma were accompanied by a significant deterioration in the functional state of the liver in comparison to the animals with similar skeletal trauma without additional intoxication. Conclusions. Under conditions of additional intake of copper and zinc ions (in the 2nd group), after 14 days and 28 days of observation, all the studied indicators are much higher than in the group of the animals without additional intoxication with these ions. The use of Unithiol reduced the toxic effect of copper and zinc ions on the studied indicators of the functional state of the liver both in the early and late period of the traumatic disease.
Wprowadzenie. Celem pracy było poznanie wpływu nadmiaru jonów miedzi i cynku w wodzie pitnej na funkcje wytwarzania i wydzielania żółci w wątrobie w warunkach urazu mechanicznego oraz skuteczności terapii antidotum. Materiał i metody. Doświadczenia przeprowadzono na 60 samcach szczurów szczepu Wistar o masie 180-200 g. W badaniu uczestniczyły 3 grupy zwierząt doświadczalnych: grupa 1 – symulowano tylko uraz szkieletowy; grupa 2 – symulowano uraz szkieletowy i podawano sole cynku i miedzi; grupa 3 – uraz szkieletowy + sole cynku i miedzi, a następnie leczenie Unithiolem. Wyniki. W późnym okresie choroby urazowej (14-28 dni), po ciężkim urazie szkieletowym, wzrosło nasilenie bromosulfaleiny w tkance wątrobowej i wystąpiły objawy zwiększonego wytwarzania bilirubiny bezpośredniej na skutek dodatkowego przyjmowania jonów miedzi i cynku. Zwierzętom z ciężkim urazem szkieletowym towarzyszyło znaczne pogorszenie stanu czynnościowego wątroby w przeciwieństwie do zwierząt z podobnym urazem szkieletowym bez dodatkowego zatrucia. Wnioski. W warunkach dodatkowego przyjmowania jonów miedzi i cynku (w drugiej grupie), po 14 i 28 dniach obserwacji, wszystkie badane wskaźniki były znacznie wyższe niż w grupie zwierząt bez dodatkowego zatrucia jonami. Stosowanie Unithiolu zmniejszyło toksyczny wpływ jonów miedzi i cynku na badane wskaźniki stanu czynnościowego wątroby zarówno we wczesnym, jak i późnym okresie choroby urazowej.
Źródło:
Health Problems of Civilization; 2022, 16, 4; 323-329
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genesis of hydrogen sulfide in carbonate reservoirs
Geneza siarkowodoru w węglanowych skałach zbiornikowych
Autorzy:
Matyasik, I.
Spunda, K.
Kania, M.
Wencel, K.
Powiązania:
https://bibliotekanauki.pl/articles/1835280.pdf
Data publikacji:
2018
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
hydrogen sulfide
bacterial sulfate reduction
thermochemical sulfate reduction
main dolomite
siarkowodór
bakteryjna redukcja siarczanów
termochemiczna redukcja siarczanów
dolomit główny
Opis:
The article presents the problem of hydrogen sulfide (H2S) occurring in hydrocarbon deposits and copper mines. The presence of this gas is an immense problem due to the necessity of removing it from liquid and gaseous deposits, threat to miner’s life, a negative impact on the equipment and the need of its utilization. The authors try to determine the origin of hydrogen sulfide in sedimentary basins on the basis of literature data concerning Polish and foreign deposits. The main processes of hydrogen sulfide formation are bacterial sulfate reduction (BSR) and thermochemical sulfate reduction (TSR). Because of similar products of these reactions, the unequivocal identification of the process of hydrogen sulfide formation is a difficult problem to solve. It is necessary to use additional geological and geochemical indicators to identify the origin of this gas. In this article Polish and foreign deposits with documented symptoms of the presence of hydrogen sulfide are compared. In addition, major mechanisms of H2S generation and criteria necessary for the occurrence of BSR and TSR processes are presented. The knowledge gained is essential at the stage of planning the exploitation of the reservoirs in order to predict the hydrogen sulfide presence.
W artykule poruszony został problem występowania siarkowodoru w złożach węglowodorów oraz rud miedzi. Obecność tego gazu jest dużym problemem ze względu na konieczność jego usunięcia z ciekłych i gazowych kopalin, zagrożenia życia górników prowadzących eksploatację w kopalniach, negatywny wpływ na urządzenia oraz konieczności jego zagospodarowania. Autorzy wskazują na genezę siarkowodoru w basenach sedymentacyjnych, na podstawie danych literaturowych dotyczących złóż polskich i światowych. Jako główne procesy powstawania H2S przyjmuje się bakteryjną redukcję siarczanów (BRS), a także termochemiczną redukcję siarczanów (TRS). Ze względu na jednakowe produkty tych reakcji, jednoznaczne określenie procesu powstania siarkowodoru jest problemem trudnym do rozwiązania. Niezbędne jest zastosowanie dodatkowych wskaźników geologicznych i geochemicznych w celu określenia genezy tego gazu. W prezentowanej pracy zestawiono krajowe i zagraniczne złoża w których odnotowano przejawy obecności siarkowodoru. Ponadto przedstawiono główne mechanizmy jego powstawania oraz kryteria które muszą zostać spełnione aby zaistniał proces BRS lub TRS. Zdobyta wiedza jest niezbędna na etapie planowania eksploatacji złóż celem przewidzenia możliwości wystąpienia siarkowodoru.
Źródło:
Nafta-Gaz; 2018, 74, 9; 627-635
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dermatan sulfate remodeling associated with advanced Dupuytrens contracture
Autorzy:
Koźma, Ewa
Głowacki, Andrzej
Olczyk, Krystyna
Ciecierska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1040877.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
epimerization
fibrous cords
dermatan sulfate
Dupuytren's contracture
Opis:
Dermatan sulfate (DS) widespread as a component of extracellular matrix proteoglycans, is characterized by great bio-reactivity and remarkable structural heterogeneity due to distinct degrees of sulfation and glucuronosyl epimerization and different polymerization degrees. However, DS metabolism under various biological conditions is poorly known. Dupuytren's contracture is a benign fibromatosis leading to complex remodeling of the palmar fascia structure and properties. However, it remains unclear whether the disease affects the structure of DS, which is the major tissue glycosaminoglycan. Thus the aim of the study was to examine the structure of the total DS in Dupuytren's fascia. DS chains were extracted from 5 samples of normal fascia and 7 specimens of Dupuytren's tissue by papain digestion followed by fractionation with cetylpyridinium chloride. Then, DS structure analysis was performed comprising the evaluation of its molecular masses and sensitivity to hyaluronidase and chondroitinase B. Dupuytren's contracture is associated with significant remodeling of DS chain structure revealed by (1) a distinct profile of chain molecular masses characterized by the appearance of long size components as well as the increase in the content of small size chains; (2) a different glucuronosyl epimerization pattern connected with the enhanced content of glucuronate disaccharide blocks; (3) chain oversulfation. These structural alterations in total DS may modify the GAG interactions especially affecting collagen fibrillogenesis and growth factor availability. Thus, Dupuytren's contracture associated DS remodeling may promote the phenomena typical for advanced disease: apoptosis and reduction in cell number as well as the appearance of dense pseudotendinous collagen matrix.
Źródło:
Acta Biochimica Polonica; 2007, 54, 4; 821-830
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of the novel calcium phosphate/sulfate based bone cements
Autorzy:
Czechowska, J.
Paszkiewicz, Z.
Ślósarczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/286028.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterial
calcium phosphate
calcium sulfate
dicalcium phosphate anhydrous
Opis:
Calcium phosphate cements (CPCs) are a family of self-setting, bone repair materials. CPCs possess excellent biocompatibility, surgical handiness and adequate mechanical properties but reveal slow resorption in vivo. Currently, very interesting group of CPCs are biomaterials composed of a-tricalcium phosphate (a-TCP, a-Ca3(PO4)2) and calcium sulfate. Calcium sulfate hemihydrate (CSH, CaSO40.5 H2O) posses a long clinical history in different fields of medicine and is widely recognized as a safe, fast setting and resorbable implant material. The main goal of this study was to investigate how different factors influence the phase composition and physico-chemical properties of the new, cement-type material on the basis of a-TCP, CSH and anhydrous dicalcium phosphate (DCP, CaHPO4). In presented work two different powder phase compositions and three liquid phases were used to produce new bone substitutes. XRD results showed that obtained materials, after setting and hardening, consisted of α-TCP, DCP, DCPD (CaHPO42H2O), HA and bassanite phases. Initial (I) and final (F) setting times of the cement pastes were determined with Gillmore needles and differed in the range of 4-14 min (I) and 10-30 min (F). Increase in the amount of CSH in the powder component resulted in shortening of setting time. Microstructure of cements was evaluated on the fractured samples by scanning electron microscopy (SEM) and the porosity via mercury porosimetry. Open porosity of the final materials was similar for all investigated compositions. Compressive strength depended on the composition and increased steadily over a period of maturation. The results obtained suggest that calcium phosphate/sulfate bone cement has the potential to be applied for bone augmentation.
Źródło:
Engineering of Biomaterials; 2012, 15, 115; 2-6
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The flotation separation of barite-calcite using sodium silicate as depressant in the presence of sodium dodecyl sulfate
Autorzy:
Chen, Xiong
Gu, Guohua
Liu, Donghui
Zhu, Renfeng
Powiązania:
https://bibliotekanauki.pl/articles/110272.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
calcite
barite
sodium dodecyl sulfate
sodium silicate
Opis:
The flotation separation of barite from calcite using sodium dodecyl sulfate (SDS) as the collector and sodium silicate (SS) as the depressant has been concretely studied in this paper. The results show that SDS has high collecting ability for both barite and calcite and that the flotation separation of barite from calcite cannot be achieved by using SDS alone. The depressant sodium silicate has a selective depression effect on calcite by the control of the pulp pH at 9.0 in the presence of SDS. Through locked cycle tests, a concentrate containing 95.54% BaSO4 can be obtained from an actual ore containing 24.5% BaSO4, with a recovery of 86.11%. The zeta potential measurements, adsorption analysis and infrared spectrum studies reveal that the pre-adsorption of sodium silicate strongly favors the adsorption of SDS on the calcite surface and adversely affects SDS adsorption on the barite surface. This property is the reason for the selective depression of SS on calcite.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 346-355
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective reduction of PbSO4 to PbS with carbon and flotation treatment of synthetic galena
Autorzy:
Zheng, Y.-X.
Liu, W.
Qin, W.-Q.
Han, J.-W.
Yang, K.
Luo, H.-L.
Powiązania:
https://bibliotekanauki.pl/articles/110717.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wastes
lead sulfate
reduction
carbon
lead sulfide
flotation
Opis:
In order to recover lead from the zinc leaching residues, a new technology involving selective reduction of lead sulfate to lead sulfide with carbon followed by flotation was investigated. The reduction thermodynamics of PbSO4 was discussed and the effects of molar ratio of C to PbSO4, reaction temperature and time were examined by thermogravimetry (TG) and XRD. Verification tests were further carried out to prove the conclusions of thermodynamic and TG analyses, and the transformation extent could reach 86.45% under the optimal roasting conditions. The prepared galena was then subjected to micro-flotation tests, and the highest lead recovery could reach up to 75.32%.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 535-546
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Synthesis of Lithium Carbonate (Li2CO3) from Waste Acidic Sludge
Autorzy:
Choi, Dong Hyeon
Wang, Jei-Pil
Powiązania:
https://bibliotekanauki.pl/articles/351124.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lithium carbonate
thermogravimetric apparatus
lithium sulfate
carbon dioxide
Opis:
In this study, the synthesis of lithium carbonate (Li2 CO3 ) powder was conducted by a carbonation process using carbon dioxide gas (CO2 ) from waste acidic sludge based on sulfuric acid (H2 SO4 ) containing around 2 wt.% lithium content. Lithium sulfate (Li2 SO4 ) powder as a raw material was reacted with CO2 gas using a thermogravimetric apparatus to measure carbonation conditions such as temperature, time and CO2 content. It was noted that carbonation occurred at a temperature range of 800°C to 900°C within 2 hours. To prevent further oxidation during carbonation, calcium sulfate (CaO4 S) was first introduced to mixing gases with CO2 and Ar and then led to meet in the chamber. The lithium carbonate obtained was examined by inductively coupled plasma–mass spectroscopy (ICP-MS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and it was found that of lithium carbonate with a purity above 99% was recovered.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1351-1355
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity and kinetic properties of phosphotransacetylase from intestinal sulfate-reducing bacteria
Autorzy:
Kushkevych, Ivan
Powiązania:
https://bibliotekanauki.pl/articles/1039142.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
sulfate-reducing bacteria
phosphotransacetylase
kinetic analysis
inflammatory bowel diseases
Opis:
Phosphotransacetylase activity and the kinetic properties of the enzyme from intestinal sulfate-reducing bacteria Desulfovibrio piger and Desulfomicrobium sp. has never been well-characterized and has not been studied yet. In this paper, the specific activity of phosphotransacetylase and the kinetic properties of the enzyme in cell-free extracts of both D. piger Vib-7 and Desulfomicrobium sp. Rod-9 intestinal bacterial strains were presented at the first time. The microbiological, biochemical, biophysical and statistical methods in this work were used. The optimal temperature and pH for enzyme reaction was determined. Analysis of the kinetic properties of the studied enzyme was carried out. Initial (instantaneous) reaction velocity (V0), maximum amount of the product of reaction (Pmax), the reaction time (half saturation period, τ) and maximum velocity of the phosphotransacetylase reaction (Vmax) were defined. Michaelis constants (Km) of the enzyme reaction (3.36 ± 0.35 mM for D. piger Vib-7, 5.97 ± 0.62 mM for Desulfomicrobium sp. Rod-9) were calculated. The studies of the phosphotransacetylase in the process of dissimilatory sulfate reduction and kinetic properties of this enzyme in intestinal sulfate-reducing bacteria, their production of acetate in detail can be perspective for clarification of their etiological role in the development of the humans and animals bowel diseases. These studies might help in predicting the development of diseases of the gastrointestinal tract, by providing further details on the etiology of bowel diseases which are very important for the clinical diagnosis of these disease types.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 103-108
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 84

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