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Wyszukujesz frazę "copper excess" wg kryterium: Wszystkie pola


Wyświetlanie 1-10 z 10
Tytuł:
Analysis of serum copper and zinc concentration among excess body mass persons due to their age
Analiza stężeń cynku i miedzi w surowicy osób ze zwiększoną masą ciała w zależności od wieku
Autorzy:
Dziegielewska, S.
Wysocka, E.
Cofta, S.
Torlinski, L.
Powiązania:
https://bibliotekanauki.pl/articles/14150.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Metabolic alterations in physiological aging may depend on oxidative-antioxidative balance and biomineral status. The aim was to analyze concentrations of serum copper (Cu) and zinc (Zn) among excess body mass persons due to their age. Material: 72 healthy Caucasians, divided into 3 groups: AGE1, AGE2, AGE3 (30-45, 46-60, 61-75 years old respectively), with body mass index (BMI) ≥25 kg m–2 were qualified for oral glucose tolerance test (OGTT) and fasting (G0') and 2-hours (G120') glycemia were determined (enzymatically). Type 2 diabetes mellitus was excluded. Concentration of serum Cu and Zn (AAS), insulin (ELISA) and plasma lipids: total cholesterol, high density lipoproteins cholesterol, triacyloglyceroles (enzymatically) were measured in fasting samples. Low density lipoproteins cholesterol was obtained using Friedewald formula. Insulin Resistance ratios and Cu/Zn ratio were calculated. Results: No differences concerning BMI, waist, diastolic blood pressure, lipids and insulin concentrations and insulin resistance ratios were observed. Increasing G0’, G120' and systolic blood pressure from group 1 to 3 (p=0.01, p=0.01, p=0.04 respectively) were found. AGE2 group had the lowest Zn concentration 10.67±3.37 μmol dm–3, (p=0.002) and the highest Cu/Zn ratio 1.73±0.64 (p=0.0003). We calculated negative correlations Zn and SBP (R=-0.45, p=0.04), Zn and DBP (R=-0.46, p=0.04), Zn and G 120’ (R=-0.45, p=0.03) in the oldest group. Conclusions: Different zinc concentration while aging may occur, and may imply different metabolic usage of the biominerals, especially in obese patients otherwise healthy subjects.
W procesie starzenia obserwuje się rozwój zaburzeń metabolicznych, w których dyskutuje się udział stanu równowagi oksydacyjno-antyoksydacyjnej oraz biopierwiastków: cynku i miedzi. Celem badań była ocena stężenia cynku i miedzi w surowicy osób o zwiększonej masie ciała w zależności od ich wieku. W badaniach uczestniczyły 72 osoby rasy białej o zwiększonym BMI ≥25 kg m–2; przeprowadzono test doustnego obciążenia glukozą (OGTT), mierząc glikemię na czczo (G0’) i po 2 h (G120’) enzymatycznie. Wykluczono osoby z cukrzycą typu 2. Na czczo oznaczono stężenie cynku i miedzi (AAS), insuliny (ELISA) w surowicy oraz stężenie parametrów lipidowych: cholesterolu całkowitego, cholesterolu frakcji HDL, triacylogliceroli (enzymatycznie). Cholesterol frakcji LDL wyznaczono wzorem Friedewalda. Obliczono wskaźniki insulinooporności oraz stosunek Cu/Zn. Badano grupy w zależności od wieku: AGE1, AGE2, AGE3 (odpowiednio: 30-45, 46-60, 61-75 lat). Stwierdzono, że grupy nie różniły się BMI, obwodem pasa, rozkurczowym ciśnieniem tętniczym, profilem lipidowym, stężeniem insuliny oraz wskaźników insulionoporności. Analiza grup 1-3 wykazała wzrastające stężenie G0’, G120’ i ciśnienie skurczowe (SBP), odpowiednio p=0,01; p=0,01; p=0,04 oraz różnice w stężeniu Zn (p=0,002) i Cu/Zn (p=0,0003), z najniższymi wartościami Zn 10,67±3,37 μmol dm–3 i najwyższym Cu/Zn 1,73±0,64 – u AGE2; u AGE3 zaobserwowano ujemne korelacje dla Zn i SBP (R=-0,45; p=0,04), Zn i DBP (R=-0,46; p=0,04), Zn i G120’ (R=-0,45; p=0,03). Dysproporcja stężeń Zn między grupą w średnim a podeszłym wieku może być tłumaczona różnymi sposobami wykorzystania Zn w obliczu zaburzeń metabolicznych.
Źródło:
Journal of Elementology; 2011, 16, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper excess-induced large reversible and small irreversible adaptations in a population of Chlamydomonas reinhardtii CW15 (Chlorophyta)
Autorzy:
Plucinski, B.
Waloszek, A.
Rutkowska, J.
Strzalka, K.
Powiązania:
https://bibliotekanauki.pl/articles/57084.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Two Chlamydomonas reinhardtii CW15 populations modified by an excess of copper in growth medium were obtained: a “Cu” population that was continuously grown under the selection pressure of 5 μM Cu²⁺ (for at least 48 weeks) and the “Re” population, where a relatively short (9 week) exposure to elevated copper, necessary for acquiring tolerance, was followed by a prolonged period (at least 39 weeks) of cultivation at a normal (0.25 μM) copper concentration. Cells of the Cu population were able to multiply at a Cu²⁺ concentration 16 times higher than that of the control population at a normal light intensity and at a Cu²⁺ concentration 64 times higher when cultivated in dim light. The potential quantum yield of photosystem II (FV/FM ratio) under copper stress was also significantly higher for the Cu population than for Re and control populations. The Re population showed only residual tolerance towards the elevated concentration of copper, which is revealed by an FV/FM ratio slightly higher than in the control population under Cu²⁺ stress in dim light or in darkness. We postulate that in the Chlamydomonas populations studied in this paper, at least two mechanisms of copper tolerance operate. The first mechanism is maintained during cultivation at a standard copper concentration and seems to be connected with photosynthetic apparatus. This mechanism, however, has only low adaptive value under excess of copper. The other mechanism, with a much higher adaptive value, is probably connected with Cu²⁺ homeostasis at the cellular level, but is lost during cultivation at a normal copper concentration.
Źródło:
Acta Societatis Botanicorum Poloniae; 2018, 87, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How copper excess influences homeostasis of the bank vole (Myodes glareolus)
Autorzy:
Miska-Schramm, A.
Zakrzewska, M.
Hajduk, J.
Kruczek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189831.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
copper
iron
zinc
bank vole
homeostasis
Opis:
Copper is a physiologically occurring trace element, the availability of which to wild small mammals is constantly increasing. This research deals with the questions of how copper in doses equivalent to those found in the natural environment from polluted areas (Cu I – 150 mg kg-1, Cu II – 600 mg kg-1) influences homeostasis of small rodents. The following were used as indicators: ratios of organs to body mass, blood parameters (haematocrit, haemoglobin), copper, iron and zinc concentrations in selected tissues and in excrements. The bank vole was used as a model species (n = 72). Haematocrit was assessed using a haematocrit reader, while haemoglobin was determined with a spectrophotometer. The content of Cu, Fe and Zn was analyzed using the flame method. Ratios of the liver and kidneys to body mass were significantly lower in animals exposed to 600 mg kg-1 Cu than in the control. Copper accumulated in the liver, kidneys, brain and excrements of the Cu II animals of both sexes. It also influenced the iron and zinc homeostasis by decreasing the iron concentration in the kidneys of both sexes, in the liver of females and in male testes. Additionally, it caused a decline in iron excretion in females. Compared to the control, the zinc concentration was significantly higher in the liver and brain of animals exposed to copper solutions as well as in the kidneys of copper treated males. Along with an increase in copper, the zinc concentration in faeces decreased significantly. In conclusion, copper pollution influences negatively the homeostasis of small mammals. Consequently it may interfere with trophic chains, which could affect adversely the degree of biodiversity.
Źródło:
Journal of Elementology; 2017, 22, 2; 617-628
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How copper excess influences homeostasis of the bank vole (Myodes glareolus)
Autorzy:
Miska-Schramm, A.
Zakrzewska, M.
Hajduk, J.
Kruczek, M.
Powiązania:
https://bibliotekanauki.pl/articles/961456.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Copper is a physiologically occurring trace element, the availability of which to wild small mammals is constantly increasing. This research deals with the questions of how copper in doses equivalent to those found in the natural environment from polluted areas (Cu I – 150 mg kg-1, Cu II – 600 mg kg-1) influences homeostasis of small rodents. The following were used as indicators: ratios of organs to body mass, blood parameters (haematocrit, haemoglobin), copper, iron and zinc concentrations in selected tissues and in excrements. The bank vole was used as a model species (n = 72). Haematocrit was assessed using a haematocrit reader, while haemoglobin was determined with a spectrophotometer. The content of Cu, Fe and Zn was analyzed using the flame method. Ratios of the liver and kidneys to body mass were significantly lower in animals exposed to 600 mg kg-1 Cu than in the control. Copper accumulated in the liver, kidneys, brain and excrements of the Cu II animals of both sexes. It also influenced the iron and zinc homeostasis by decreasing the iron concentration in the kidneys of both sexes, in the liver of females and in male testes. Additionally, it caused a decline in iron excretion in females. Compared to the control, the zinc concentration was significantly higher in the liver and brain of animals exposed to copper solutions as well as in the kidneys of copper treated males. Along with an increase in copper, the zinc concentration in faeces decreased significantly. In conclusion, copper pollution influences negatively the homeostasis of small mammals. Consequently it may interfere with trophic chains, which could affect adversely the degree of biodiversity.
Źródło:
Journal of Elementology; 2017, 22, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physiological reaction of basket willow (Salix viminalis L.) to copper excess in hydroponic medium
Autorzy:
Malinowska, Katarzyna
Malinowski, Ryszard
Studziński, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/2045727.pdf
Data publikacji:
2018
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
Salix viminalis L.
copper stress
CO2 assimilation
photosynthetic pigments
transpiration
water content
water use efficiency
Opis:
The influence of copper salt, in a concentration range of 50–150 mg·dm−3, on the physiological response of basket willow was studied on Tora variety, which were grown in hydroponics. Content of assimilation pigments, relative water content (RWC), water saturation deficit (WSD), intensity of assimilation and transpiration, stomatal conductance, photosynthetic rate of water use efficiency (WUE) and instantaneous photosynthetic rate of water use (WUEI) were determined in leaves. It was observed that the decrease in the concentration of tested physiological parameters correlated with the increase in copper salt doses in the medium. The assimilation and transpiration of basket willow were significantly limited by stomata. The addition of copper salt to the medium increased WSD in leaves of the basket willow. The obtained results of the studied physiological parameters may prove useful for the assessment of resistance of the studied willow cultivar to stress caused by increased copper ion content in medium and its applicability in reclamation of areas degraded by humans.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2018, 60, 4; 214-220
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Copper Doped Neodymium Nickelate Oxide as Cathode Material for Solid Oxide Fuel Cells
Autorzy:
Lee, K. J.
Choe, Y-J.
Hwang, H-J.
Powiązania:
https://bibliotekanauki.pl/articles/351292.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solid oxide fuel cells
copper
electrical conductivity
excess oxygen
Opis:
Mixed ionic and electronic conducting K2NiF4-type oxide, Nd2Ni1-xCuxO4+δ (x=0~1) powders were synthesized by solid state reaction technique and solid oxide fuel cells consisting of a Nd2Ni1-xCuxO4+δ cathode, a Ni-YSZ anode and ScSZ as an electrolyte were fabricated. The effect of copper substitution for nickel on the electrical and electrochemical properties was examined. Small amount of copper doping (x=0.2) resulted in the increased electrical conductivity and decreased polarization resistance. It appears that this phenomenon was associated with the high mean valence of nickel and copper and the resulting excess oxygen (δ). It was found that power densities of the cell with the Nd2Ni1-xCuxO4+δ (x=0.1 and 0.2) cathode were higher than that of the cell with theNd2NiO4+δ cathode.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 625-628
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regulation of mitochondrial manganese superoxide dismutase (MnSOD) gene expression in cereals by copper and manganese excess
Zmiana ekspresji genu mitochondrialnej manganowej dysmutazy ponadtlenkowej (MnSOD) w zbożach pod wpływem miedzi i manganu
Autorzy:
Nowak, M.
Leśniowska-Nowak, J.
Sozoniuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/13097567.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
heavy metal
copper
manganese
stress
mitochondrial manganese superoxide dismutase
gene expression
Triticum aestivum
Hordeum vulgare
Źródło:
Agronomy Science; 2020, 75, 2; 59-71
2544-4476
2544-798X
Pojawia się w:
Agronomy Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skuteczność sorbentów organicznych w detoksykacji gleby zanieczyszczonej
Effectiveness of organic sorbents in polluted soil detoxification
Autorzy:
Wróbel, S
Powiązania:
https://bibliotekanauki.pl/articles/401052.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
gleba lekka
nadmiary miedzi
pozostałości herbicydu
remediacja gleby
rzepak ozimy
light soil
excess copper
herbicide residue
soil remediation
winter rape
Opis:
W badaniach oceniono fitotoksyczne oddziaływanie zanieczyszczenia gleby lekkiej nadmiarem miedzi i pozostałością herbicydu w doświadczeniach wazonowych z rzepakiem ozimym, a także skuteczność detoksykacji badanej gleby poprzez wprowadzanie sorbentów organicznych (torfu, biohumusu) oraz węglanu wapnia. Badania przeprowadzono w warunkach hali wegetacyjnej, stosując symulacyjne skażenie gleby miedzią na poziomie 180 i 360 mg Cu.kg-1 suchej masy gleby oraz pozostałością herbicydu w ilościach stwierdzanych w glebie w następstwie stosowania preparatu Starane 250 EC w uprawie przedplonu. Stwierdzono niekorzystne dla rozwoju roślin współdziałanie badanych polutantów, wyrażające się spadkami plonowania przy wzrostowej tendencji biodostępności miedzi. Zastosowana remediacja wyraźnie łagodziła skutki fitotoksyczności nadmiaru miedzi, jednak jej skuteczność była mniejsza na glebie zanieczyszczonej pozostałością herbicydu. Efekt ten wiązać można z wolniejszym przebiegiem procesów degradacji herbicydu w glebie obiektów doświadczenia zanieczyszczonych miedzią. Najwyższą skuteczność remediacji uzyskano pod wpływem łącznej aplikacji biohumusu i węglanu wapniowego.
The study has been carried out in order to assess the phytotoxic effect that light soil polluted with excess copper and herbicide residue can exert on winter rape plants. Another aim has been to evaluate the effectiveness of detoxifying the analyzed soil by amending it with organic sorbents (peat, biohumus) or/and calcium carbonate. The experiment consisted of pot trials, carried out in a greenhouse, in which the simulated soil contamination with copper reached the levels of 180 and 360 mg Cu.kg-1 of soil dry matter and herbicide was introduced in the amounts determined in soil after the herbicide Starane 250 EC had been applied while cultivating the preceding crop. Adverse interaction of the analyzed pollutants on the crop development was observed with the bioavailability of Cu being elevated. Soil remediation alleviated the harmful effect of excess copper toxicity with this positive impact being impaired on soil polluted with herbicide residue. This effect can be associated with the reduced degradation of herbicide in the copper contaminated soil. The highest remediation effectiveness was achieved when soil had been amended with biohumus along with CaCO3.
Źródło:
Inżynieria Ekologiczna; 2012, 31; 144-153
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Mechanical Properties and Precipitation Reactions in Low Copper Containing Al-Mg-Si Alloy
Autorzy:
Belghit, H.
Farh, H.
Ziar, T.
Zidani, M.
Guemini, M.
Powiązania:
https://bibliotekanauki.pl/articles/354817.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Mg-Si alloys
precipitation
DSC
TEM
excess Si
copper
Opis:
The scope of this work is to investigate the precipitation of two Al-Mg-Si alloys with and without Cu and excess Si by using the differential scanning calorimetry (DSC), transmission electron microscopic (TEM), Vickers hardness measurement and X-ray diffraction. The analysis of the DSC curves found that the excess Si accelerate the precipitation and the alloy contain the excess Si and small addition of copper has higher aging-hardness than that of free alloy (without excess Si and Cu) at the same heat treatment condition. The sufficient holding time for the precipitation of the β'' phase was estimated to be 6 hours for the alloy aged at 100°C and 10 hours for the alloy aged at 180°C. The low Copper containing Al-Mg-Si alloy gives rise to the forming a finer distribution of β (Mg2Si) precipitates which increases the hardness of the alloy. In order to know more about the precipitation reactions, concern the peaks on the DSC curve transmission electron microscopy observation were made on samples annealed at temperatures (250°C, 290°C and 400°C) just above the corresponding peaks of the three phases β'', β' and β respectively.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1643-1648
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of salicylic acid and excess of copper on selected stress parameters induced in Phaseolus coccineus leaves
Autorzy:
Hanaka, A.
Dresler, S.
Bednarek, W.
Wojcik, M.
Maksymiec, W.
Powiązania:
https://bibliotekanauki.pl/articles/81194.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
salicylic acid
copper excess
phenolic compound
abiotic stress
anthocyanin
Phaseolus coccineus
runner bean plant
leaf
stress parameter
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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