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Tytuł:
Contaminants of post-leaching copper solutions and their behavior during extraction with industrial extractants
Autorzy:
Gotfryd, L.
Pietek, G.
Powiązania:
https://bibliotekanauki.pl/articles/109816.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
industrial copper extractants
copper contaminants
copper extraction isotherms
Opis:
Several copper extractants have been examined in laboratory glassware with a special attention paid to their behavior towards cations others than copper(II). In the studies 25 vol. percent of hydrocarbon (Exxsol D80 AZ) solutions of six industrial copper extractants have been used. They were mainly rea-gents of hydrooxime type (LIX 860N-IC, LIX 984, LIX 984N, LIX 84-I, Acorga M5640) and diketone type LIX 54-100. Individual isotherms of independent extraction of copper(II) and selected cations (Fe3+, Fe2+, Co2+, Ni2+, Zn2+, Mn2+, Cd2+, Mg2+) versus equilibrium pH have been compared. Investigations have been conducted with synthetic 0.1 mol/L solutions of their sulfates. The values of pH50% − parameter defined as an equilibrium pH at the moment of half-and-half extraction of the investigated cationic spe-cies have been presented. Also ΔpH50%, that is differences between values of pH50% for specific cation Me(II) and copper(II): ΔpH50% = pH50%(Me) − pH50%(Cu), have been given. In addition to that 25% LIX 984 has been used in counter-current pilot trials for copper(II) extraction from naturally contaminated solutions produced by bioleaching of industrial sulfide copper concentrate to observe behavior of investi-gated contaminants such as correlations between their real co-extraction with copper(II) and the position of their extraction on the pH scale. Copper electrolyte/strip solution, working alternately within close loop of coupled stripping - electrowinning system, has been analyzed during consecutive cycles to observe building up of the contaminants concentrations in the course of test.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 133-143
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper deposition on stainless steel sheets in copper nitrate solution
Autorzy:
Kekki, A.
Aromaa, J.
Forsen, O.
Powiązania:
https://bibliotekanauki.pl/articles/110678.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper nitrate
electrorefining
high purity copper
hydrometallurgy
Opis:
The aim of this study was to examine factors that influence copper nitrate based electrorefining of copper and to search the best process parameters for high-purity copper deposition on AISI 316L steel blanks. Considering impurities, the most important goal was to minimize sulfur content in a copper cathode. The effect of Cu2+ concentration, current density, temperature and pH were studied. The best parameters for the best copper purity were sorted out. The most important factors for quality copper deposition are sufficiently low Cu2+ concentration, low current density, right zone and careful control of pH. Active nitrate ion reduction reactions catalyzed by copper ions are suggested to affect detrimentally both copper deposition current efficiency and purity. Furthermore, nitrate ion reactions seem to elevate an electrolyte pH so that the deposition appears to be dark brow copper oxide. The 6N purity for copper was not reached with this cell construction and it felled behind about 7 ppm (99.9993% Cu). Both, sulfur and silver concentration were slightly above 1 - 2 ppm. To minimize the impurities, electrolyte circulation and filtration are needed. Also, either a separate silver cementation cell or cementation membrane is needed.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 247-256
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of proppant pack permeability assessment
Autorzy:
Lutynski, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/110881.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper nitrate
electrorefining
high purity copper
hydrometallurgy
Opis:
Hydraulic fracturing methods used for low permeability reservoirs such as shale gas or tight gas require the use of proppants. The current standard used for proppant assessment does not take into account its interaction with the rock and the embedment effect. In this paper a new method of proppant pack permeability assessment is proposed where proppant is placed into a rock sample with induced fracture. Three types of proppant were assessed to verify the method i.e. offshore sand, onshore sand and ceramic proppant. The rock sample was a Tumlin sandstone. As the flowing medium supercritical carbon dioxide was used. Tests were performed with 300-500 μm size proppants at flowing pressure of 3 MPa and confining pressure of 5 MPa. Additional test was conducted with 1–2 mm sand proppant at two confining pressure, i.e. 5 MPa and 16 MPa. Proppant were characterized in accordance with the Krumbein/Sloss diagram. Similar values of permeability for the proppant concentration of 0.5 kg/m2 were obtained ranging from 2.3 to 3.3 D although the highest permeability was achieved with Baltic sand proppant and ceramic proppant. For the larger size of proppant (1 – 2 mm) the initial permeability with confining pressure of 5 MPa was initially larger but when the confining pressure was increased it declined by 37%. This proves that in the proposed method we can observe changes in the permeability of the fracture with change in confining pressure apply subjected to the sample.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 325-334
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Study of Copper Alloy with Graphene Additive via x-Ray Diffraction
Autorzy:
Masri, Mohamad Najmi
Mohammad, M.
Yusoff, Mahani
Mamat, Sarizam
Teo, Pao Ter
Othman, R.
Irfan, Abd Rahim
Singh, Pramod K.
Powiązania:
https://bibliotekanauki.pl/articles/2134097.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper alloy
graphene
powder metallurgy
copper
zinc
Opis:
This study evaluated the effect of milling speed and compaction pressure on the densification and morphology of the CuZn-Gr composite. The composite was prepared by using the powder metallurgy technique. The effect on the microstructural and compaction was determined based on different milling speeds. The different milling speeds involved were 175, 200, 225, and 250 rpm. Meanwhile, the different compaction pressures used in this study were 127, 250, 374, and 500 MPa. The properties of the milled powder gave the result to green density and densification parameters. The XRD pattern of Cu and Zn broadened as milling time increased.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1051--1053
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Technology of Alloyed Copper Casting
Autorzy:
Rzadkosz, S.
Kranc, M.
Garbacz-Klempka, A.
Piękoś, M.
Kozana, J.
Cieślak, W.
Powiązania:
https://bibliotekanauki.pl/articles/380832.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting technology
copper
alloyed copper
copper deoxidation
heat treatment
technologia odlewnicza
miedź
obróbka cieplna
Opis:
The work presents experiment results from the area of copper casting technology and chosen examples of alloyed copper. At present, copper casting technology is applied in many branches of industrial manufacturing, especially in the sector of construction, communications, arms and power engineering. Alloyed copper, containing slight additions of different elements and having special physio-chemical properties, is used in a special range of applications. Copper technology and alloyed copper analyses have been presented, these materials being used for cast manufacturing for power engineering. The quality of casts has been assessed, based on their microstructure analysis, chemical content and the cast properties. During the research, special deoxidizing and modifying agents were applied for copper and chosen examples of alloyed copper; also exemplary samples were tested with the help of metallographic analysis, electrical conductivity and gaseous impurities research.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper(II) extraction from ammonia leach solution
Autorzy:
Ochromowicz, K.
Jeziorek, M
Wejman, K.
Powiązania:
https://bibliotekanauki.pl/articles/110345.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrometallurgy
hydroxyoximes
LIX
copper ore
copper concentrate
Opis:
Hydrometallurgical processing of copper-bearing materials (ores, concentrates, by-products) is usually done with the use of acidic or ammonia leaching. In the case where a leaching feed material contains significant amounts of carbonate rocks and iron minerals the second method is preferential due to a higher process selectivity. However, it can also be problematic considering possible ammonia transfer during the subsequent extraction process. The paper presents results of extraction of copper(II) from ammonia leach solutions. The effect of a type of extractant, its concentration and type of diluent in organic phase on extraction efficiency and ammonia transfer was studied. A few commercial extractants were examined, namely LIX 84-I, LIX 984N, LIX 54-100. The results clearly indicate that in the case of extraction systems using hydroxyoximes the extraction efficiency is remarkably higher than for βdiketone reagent. Presented studies proved that extraction efficiency of Cu(II) is also dependent on the type of diluent and is less favourable for systems with non-aliphatic diluents. It was observed that ammonia co-extraction occurs and depends on examined parameters. Scrubbing of loaded organic phase showed that ammonia can be removed almost completely using double wash with sulfuric acid solution.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 327-335
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical modeling of copper losses in the silicate slag of the sulfide concentrate smelting process
Autorzy:
Savic, M. V.
Djordjevic, P. B.
Mihajlovic, I. N.
Zivkovic, Z. D.
Powiązania:
https://bibliotekanauki.pl/articles/778781.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
modeling
copper concentrate
smelting process
copper losses
slag
ANFIS
Opis:
This article presents the results of the statistical modeling of copper losses in the silicate slag of the sulfide concentrates smelting process. The aim of this study was to define the correlation dependence of the degree of copper losses in the silicate slag on the following parameters of technological processes: SiO2, FeO, Fe3O4, CaO and Al2O3 content in the slag and copper content in the matte. Multiple linear regression analysis (MLRA), artificial neural networks (ANNs) and adaptive network based fuzzy inference system (ANFIS) were used as tools for mathematical analysis of the indicated problem. The best correlation coefficient (R2 = 0.719) of the final model was obtained using the ANFIS modeling approach.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 62-69
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Głogów copper works on the content of mobile forms of copper and zinc in arable soils
Wpływ Huty Miedzi Głogów na zawartość mobilnych form miedzi i cynku w okolicznych glebach uprawnych
Autorzy:
Jaworska, H.
Dabkowska-Naskret, H.
Powiązania:
https://bibliotekanauki.pl/articles/1188028.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
soils
copper
zinc
Opis:
Celem badań była ocena wpływu Huty Miedzi Głogów na profilową dystrybucję oraz mobilność miedzi i cynku w okolicznych glebach uprawnych. Materiał badawczy stanowiły profile glebowe położone w odległości 5,7-6,8 km w kierunku południowo-wschodnim od emitora. W próbkach glebowych pochodzących z 4 profili gleb uprawnych sklasyfikowanych jako gleby płowe typowe oznaczono: uziarnienie, pH KCl (1 mol dm- 3 ) i pH w H2O, C-organiczny oraz całkowitą zawartość Cu i Zn metodą ASA po mineralizacji w kwasach HF i HClO4, a zawartość form mobilnych Cu i Zn metodą analizy sekwencyjnej. Pod względem uziarnienia badane profile zaliczono do pyłów gliniastych. W badanych glebach pH było w zakresie pHH o 7,33-8,55 oraz pHKCl 5,81-7,75, przyjmując najniższe wartości w poziomach Bt. Stwierdzono obecność węglanu wapnia, oprcz profilu (P1), którego zawartość wynosiła 0,43%-11,60%. Najzasobniejsze w CaCOg były poziomy C oraz poziomy Bt. Zawartość C-organicznego w poziomach próchnicznych wynosiła 7,0-18,1 g kg- 1 , całkowita zawartość Cu 4,04-57,75 mg kg- 1 . Stwierdzono wyraźnie wyższą całkowitą zawartość Cu w poziomach Ap oraz najniższą w poziomach C, co wskazuje na antropogeniczne wzbogacenie poziomów Ap w Cu. Wyniki analizy sekwencyjnej wskazują na dominujący udział w poziomach powierzchniowych frakcji V, tj. form związanych z materią organiczną, w pozostałych poziomach przeważa frakcja Cu związana z tlenkami żelaza. Całkowita zawartość Zn wynosiła 3,34-42,65 mg kg- 1 , a najwyższą zawartość tego pierwiastka stwierdzono w poziomach Ap, najniższą w poziomach Eet. Analiza specjacyjna wykazała najwiekszą zawartość Zn w formie związanej z krystalicznymi tlenkami żelaza (frakcja VI), a najniższą we frakcji I i II, tj. w formach wodnorozpuszczalnych i wymiennych. Badane gleby w większości (oprócz profilu P1) można zaklasyfikować do gleb niezanieczyszczonych Cu i Zn, co wskazuje, że bliskość Huty Głogów (oprócz jednego przypadku) nie eliminuje badanych gleb z użytkowania rolniczego.
Źródło:
Journal of Elementology; 2012, 17, 1; 57-66
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of copper nanoparticles and copper sulfate administered in ovo on copper content in breast muscle, liver and spleen of broiler chickens
Wpływ nanocząstek miedzi i siarczanu miedzi podawanych in ovo na zawartość miedzi w mięśniu piersiowym, wątrobie i śledzionie kurcząt brojlerów
Autorzy:
Mroczek-Sosnowska, N.
Lukasiewicz, M.
Wnuk, A.
Sawosz, E.
Niemiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/2962.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
copper
nanoparticle
copper sulphate
copper content
breast muscle
liver
spleen
broiler chicken
egg
Opis:
Effect of copper nanoparticles and copper sulfate administered in ovo on copper content in breast muscle, liver and spleen of broiler chickens. The initial experimental material included 300 hatching eggs of Hubbard Flex chickens. The eggs were divided into three groups: control, NanoCu and CuSO4. Eggs from groups NanoCu and CuSO4 were subjected to in ovo injection to the air cell of egg. Experimental solutions were administered by in ovo injection using a sterile needle and a 0.3 mL syringe as follows: NanoCu – colloid of copper nanoparticles, concentration 50 ppm; and CuSO4 – colloid of copper sulfate, concentration 50 ppm. The eggs were incubated under standard conditions. After hatching, 50 chicks were selected from each group for 42-day rearing. The birds were fed standard feed concentrates for broilers. In that last day of rearing (42 day), 12 females and 12 males were selected from each group. The right part of their breast muscle, their liver and spleen were collected for copper content determinations. Results of this experiment confirm previous scientific reports which demonstrate that the greatest accumulation of copper is observed in soft organs like liver or spleen.
Wpływ nanocząstek miedzi i siarczanu miedzi podawanych in ovo na zawartość miedzi w mięśniu piersiowym, wątrobie i śledzionie kurcząt brojlerów. Materiał doświadczalny początkowo stanowiło 300 jaj wylęgowych kurcząt Hubbard Flex. Jaja podzielono na trzy grupy: kontrola, NanoCu i CuSO4, z czego jaja z grupy NanoCu i CuSO4 poddano zabiegowi iniekcji in ovo do komory powietrznej. Eksperymentalne roztwory podano poprzez wstrzyknięcie in ovo przy użyciu sterylnej igły i strzykawki 0,3 ml kolejno do grup: NanoCu (koloid nanocząstek miedzi, stężenie 50 ppm), CuSO4 (koloid siarczanu miedzi, stężenie 50 ppm). Jaja inkubowano w standardowych warunkach. Po wykluciu z każdej grupy wybrano po 50 piskląt do odchowu trwającego 42 dni. Ptaki żywiono standardowymi mieszankami pełnoporcjowymi dla brojlerów. W ostatnim 42. dniu odchowu z każdej grupy wybrano po 12 samic i 12 samców, od których pobrano prawą część mięśnia piersiowego, wątrobę i śledzionę celem określenia zawartości miedzi. Wyniki doświadczenia potwierdzają wcześniejsze doniesienia naukowe, że największą kumulację miedzi obserwuje się w narządach miękkich, takich jak wątroba czy śledziona.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science; 2014, 53
1898-8830
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An elite burial from the Copper Age: Grave 8 at the cemetery of the Lublin-Volhynian culture at Site 2 in Książnice, the Świętokrzyskie province
Elitarny pochówek z epoki miedzi - grób nr 8 z cmentarzyska kultury lubelsko-wołyńskiej na stan. 2 w Książnicach, woj. świętokrzyskie
Autorzy:
Wilk, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/498098.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
Lublin-Volhynian culture
Copper Age
funeral rites
copper artefacts
Książnice
Opis:
The paper describes an inhumation burial (Grave 8) discovered at the cemetery of the Lublin- Volhynian culture at Site 2 in Książnice, Świętokrzyskie Province, in August 2008. A skeleton of an adultus woman, lying in a flexed position on the left side, with the skull directed towards the south, was discovered at the depth of 55–60 cm in a partly destroyed rectangular burial pit. The unusually rich grave goods consisted of ten ornaments made from copper wire (two necklaces with spectacle-shaped pendants, two bracelets, two earrings and two rings), a chocolate flint retouched blade and a blade, as well as fragments of two clay vessels: a pear-shaped amphora and a pear-shaped goblet. The analysed burial is a perfect example of changes taking place in the social structure of the younger Danubian cultures at the turn of the 5th and the 4th millennia BC. It shows that the elite controlling trade exchange and the distribution of prestige objects in the Lublin-Volhynian culture included also women of high social standing
Źródło:
Analecta Archaeologica Ressoviensia; 2014, 9; 209-258
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of pH on solubility of copper in soils contaminated by copper industry in Legnica
Wpływ pH na mobilność miedzi w glebach zanieczyszczonych przez przemysł miedziowy w Legnicy
Autorzy:
Cuske, M.
Gersztyn, L.
Karczewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/395961.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
soil
copper
copper mobility
soil pollution
Legnica Copper Smelter
gleba
miedź
mobilność miedzi
zanieczyszczenie gleby
Huta Miedzi Legnica
Opis:
The aim of the study was to determine the influence of changes in pH on the solubility of copper in soils contaminated by copper industry. Soil samples were collected from the surface soil horizon (0-30 cm) at two sites situated in the vicinity of Legnica Copper Smelter. Soil material contained various concentrations of total Cu. Soil samples were treated with various doses of HCl and NaOH, in the presence of CaCl2 as a background electrolyte. Copper concentrations and pH values were determined in the extracts obtained from the experiment. Buffering capacity curves were prepared on the basis of those results. The changes in pH affected the solubility of copper in contaminated soils. Addition of HCl resulted in increased copper solubility, particularly strong at the doses higher than 0,2 M HCl kg-1.
Celem niniejszych badań było określenie wpływu odczynu na mobilność miedzi w glebach zanieczyszczonych przez przemysł miedziowy. W doświadczeniu pobrano dwie próbki glebowe z poziomów powierzchniowych (0-30cm) z otoczenia Huty Miedzi Legnica. Materiał glebowy różnił się całkowitą zawartością miedzi w glebie. Próbki gleby traktowane były różnymi dawkami HCl i NaOH w obecności CaCl 2 stanowiącego elektrolit podstawowy. W ekstraktach oznaczano stężenie miedzi i pH. Na tej podstawie wykreślono krzywe buforowe dla obu gleb. Zmiany wartości pH wpłynęły na rozpuszczalność miedzi w glebach zanieczyszczonych. Dodatek HCl w ilości przekraczającej 0,2 M kg-1 spowodował radykalny wzrost rozpuszczalności miedzi.
Źródło:
Civil and Environmental Engineering Reports; 2013, 11; 31-39
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE INFLUENCE OF KETOPROFEN AND ZINC OXIDE NANOPARTICLES ON SERUM COPPER LEVEL IN RATS
Autorzy:
Olbert, Magdalena
Krośniak, Mirosław
Gdula-Argasińska, Joanna
Librowski, Tadeusz
Zygmunt, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/956850.pdf
Data publikacji:
2018
Wydawca:
Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:
inflammation
ketoprofen
serum copper level
zinc oxide nanoparticles
zinc-copper antagonism
Opis:
The role of copper in anti-inflammatory response includes several mechanisms. Antagonism between zinc (Zn) and copper (Cu) and proper balance between the two elements in the organism may affect the course of inflammatory diseases. Copper is a component of Zn/Cu superoxide dismutase (Zn/Cu SOD) and other enzymes involved in the anti-inflammatory response of the organism. To investigate the serum copper level during inflammation and diseases, numerous researches were conducted. Copper deficiency or copper intoxication may lead to biological consequences. Copper deficiency may be caused by various factors, one of them is excessive zinc supplementation. The aim of the study was to investigate the alterations in the serum copper level after 2-week zinc oxide nanoparticles (NPs-ZnO) administration. The second aim was to investigate serum copper level alterations after 2-week NPs-ZnO and single ketoprofen administration. The inflammatory state was induced in each group by the carrageenan injection at the 15th day of the experiment. The results indicate for the decrease in serum copper level in group receiving NPs-ZnO compared to control. Moreover, in groups receiving NPs-ZnO as well as ketoprofen, a decrease in serum copper level was observed. We may conclude that NPs-ZnO administration and also ketoprofen administration acts as anti-inflammatory agents and may induce a decrease in serum copper level.
Źródło:
Medicina Internacia Revuo; 2018, 28, 110; 11-22
0465-5435
Pojawia się w:
Medicina Internacia Revuo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overexpression of human CUTA isoform2 enhances the cytotoxicity of copper to HeLa cells
Autorzy:
Yang, Jingchun
Li, Qiang
Yang, Huirong
Yan, Lichong
Yang, Liu
Yu, Long
Powiązania:
https://bibliotekanauki.pl/articles/1040764.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
copper toxicity
CUTA isoform2
overexpression
copper-induced apoptosis
cell proliferation
Opis:
Copper, an essential transient element, can be toxic to cells when present in excess. Altered copper homeostasis is involved in pathological events of many diseases. Human CUTA isoform2 is a member of cation tolerance protein (CutA1) family. In this study, we examined the effect of CUTA isoform2 overexpression on copper toxicity. It was shown that overexpressed CUTA isoform2 sensitized HeLa cells to copper toxicity by promoting copper-induced apoptosis. The inhibition effect of excessive copper on cell proliferation was also enhanced by overexpressed CUTA isoform2. So CUTA isoform2 was implicated to be involved in the cytotoxicity of copper.
Źródło:
Acta Biochimica Polonica; 2008, 55, 2; 411-415
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sweat lead and copper concentrations during exercise training
Autorzy:
Saran, Tomasz
Zawadka, Magdalena
Chmiel, Stanisław
Mazur, Anna
Powiązania:
https://bibliotekanauki.pl/articles/454846.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
copper
lead
physical effort
Opis:
Introduction. Skin is the largest organ of the human body. It plays an important role in protection against harmful substances found in the surrounding environment and takes part in the elimination of heavy metals from the body by sweating. The aim of the study was to evaluate the changes in the concentration of lead and copper in the sweat collected on the first and the fourteenth day of endurance training. Materials and methods. The research included 43 patients undergoing a supervised, two-week endurance training on a cycle ergometer and cross-trainer. The lead and copper contents were presented in relation to the sodium content as an indicator of the amount of excreted sweat. Results. The lead concentration in relation to the sodium content in the samples of sweat taken with the use of swabs is statistically significantly higher on day 1 (Me = 1.64-E-4) than the 14th day (Me = 0.37-E-4) p = 0.027. In the sweat samples collected with a plaster, the lead concentration on day 14 of rehabilitation (Me = 0.08-E-4) is statistically significantly lower than before the beginning of the training cycle (Me = 1.19-E-4) p = 0.044. The concentration of copper in sweat samples collected with swabs and patches on day 1 of the rehabilitation cycle does not significantly differ from the content of samples collected on day 14. Conclusions. Endurance training with submaximal heart rate results in reduced excretion of lead in the sweat and does not significantly affect the level of copper. Further research into the impact of physical effort on the excretion of metals from the body can help explain the results13
Źródło:
European Journal of Clinical and Experimental Medicine; 2018, 1; 14-19
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Some Optical Properties of Polystyrene - Copper Nanocomposite Films
Autorzy:
Kadhim, Raheem Gaayid
Powiązania:
https://bibliotekanauki.pl/articles/1192701.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
nano Copper
nanocomposites
polystyrene
Opis:
The effect of addition of nano Cu on some optical properties of polystyrene has been studied. For this purpose, many samples have been prepared by adding nano Cu to the polystyrene with different Weight percentages and different thickness. The absorption spectra have been recorded at the wavelength ranges (220-800 nm). The absorption coefficient, extinction coefficient and energy gap of the indirect allowed and forbidden transition have been determined. Results show that the absorption coefficient and extinction coefficient increase and the energy gap of the indirect allowed and forbidden transition decreases with the wt. % content of nano Cu.
Źródło:
World Scientific News; 2016, 30; 14-25
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 910

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