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Wyświetlanie 1-13 z 13
Tytuł:
The effect of heavy metals to be found in the environment on the human body
Wpływ metali ciężkich obecnych w środowisku na organizm człowieka
Autorzy:
Bálint, Á.
Kiss, R.
Szaniszló, A.
Bayoumi-Hamuda, H. E. A. F.
Powiązania:
https://bibliotekanauki.pl/articles/127207.pdf
Data publikacji:
2018
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
environmental risk
heavy metals
human hair
toxicity
ryzyko środowiskowe
metale ciężkie
włosy ludzkie
toksyczność
Opis:
The heavy metals mean serious risk in environmental pollution. Some of them are essential for many organisms in a low concentration, but the others should be toxic at low concentrations, too. The heavy metals are contacted through the food chain with living organisms. Industrial, transport and municipal waste origin effects of contaminants appear more and more in environmental pollution, and many of which earlier and nowadays got a large amount of heavy metals into the environment. Therefore, over the last few decades the trace element analytical examination of the various biological and human samples has become increasingly important. The human biological samples for trace element analysis of reliably detected many cases of occupational disease, poisoning, environmental hazards, and using the results of analyzes of health status can be characterized. This paper presents an example for the correlation of the concentration in human hair and in the environment of different heavy metals. The valley “Parád-Recsk, Hungary” has special geological capabilities. In the area of “Recsk” according to the deep drilling of mine company large amounts of copper, lead, zinc minerals have been identified. In “Parádsasvár, Hungary” worked glassworks from the early 1900s until 1995 and lead crystal glass was produced, which increased the air and soil lead content. In this area were monitored the quantities of heavy metals in soil and the human hair analysis by Flame Atomic Adsorption Spectrometry (FAAS).
Metale ciężkie stanowią poważne zagrożenie jako zanieczyszczenia środowiska. Niektóre z nich są niezbędne dla wielu organizmów w niskim stężeniu, ale pozostałe mogą być toksyczne również w małych stężeniach. Metale ciężkie ulegają translokacji poprzez łańcuch pokarmowy do żywych organizmów. Zanieczyszczenia pochodzenia przemysłowego, transportowego i z odpadów komunalnych coraz częściej zanieczyszczają środowisko, a wiele z nich dostarcza dużą ilość metali ciężkich do środowiska. Dlatego w ciągu ostatnich kilku dekad coraz ważniejsze staje się badanie różnych pierwiastków w próbkach biologicznych i ludzkich. Analiza ludzkich próbek biologicznych na obecność pierwiastków śladowych pozwala również wykryć wiele przypadków chorób zawodowych, zatruć, zagrożeń środowiskowych i dokonać oceny stanu zdrowia. W artykule przedstawiono przykład korelacji stężeń różnych metali ciężkich w ludzkich włosach i w środowisku. Dolina "Parád-Recsk, Węgry" ma szczególne cechy geologiczne. W obszarze "Recsk" wzdłuż głębokich odwiertów kopalni odkryto duże ilości miedzi, ołowiu i cynku. W "Parádsasvár, Węgry" działała huta szkła od wczesnych lat XX w. do 1995 r., gdzie wytwarzano szkło ołowiowe, co zwiększało zawartość ołowiu w powietrzu i w gruncie. Na tym obszarze monitorowano ilości metali ciężkich w glebie i w ludzkich włosach za pomocą absorpcyjnej spektrometrii atomowej z atomizacją płomieniową (FAAS).
Źródło:
Proceedings of ECOpole; 2018, 12, 1; 11-20
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition and UVA-protecting activity of extracts from Ligustrum vulgare and Olea europaea Leaves
Autorzy:
Czerwinska, M.E.
Duszak, K.
Parzonko, A.
Kiss, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/19073.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Plants belonging to the family Oleaceae have been traditionally used in treatment of various inflammatory skin disorders. One of the most well-known species is Olea europaea L. (olive), cultivated in the Mediterranean countries. Another species is Ligustrum vulgare L. (common privet), occurring particularly in Northern Europe and Asia. The aim of the study was a comparison of the composition of aqueous and ethanolic extracts from leaves of O. europaea and L. vulgare (HPLC-DAD-MS), and determination of the total content of phenolics and flavonoids, as well as the content of the major compound, oleuropein. Secondly, we aimed to study the protective effect of extracts on reactive oxygen species (ROS) production by human fibroblast cells (NHDF), cell viability (MTT assay), and apoptosis rate (Annexin V/propidium iodide staining) after UVA-irradiation. The phytochemical analysis allowed us to identify compounds belonging to the groups of flavonoids, phenylpropanoids and secoiridoids in the extracts. The compounds from the group of lignans (olivil) were identified as being unique to O. europaea extracts. Echinacoside, ligustroflavone and ligustaloside A were identified in L. vulgare extracts in contrast to olive preparations. It was established that the aqueous and ethanolic extracts from leaves of both species, except the privet aqueous extract at a concentration of 5 μg/ml, did not show any significant inhibition of ROS production after UVA-irradiation in the model of NHDF cell line. The aqueous extracts of both species at concentrations of 5 and 25 μg/ml had a protective effect on the viability of UVA-treated cells in contrast to the ethanolic extract. In conclusion, no significant difference in the activity of olive and privet leaf extracts has been observed, which suggests that both plant materials’ extracts, particularly aqueous ones, are effective herbal medicines and photoprotectors, which – to some extent – confirms the use of their preparations in skin disorders.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2016, 58, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and quantitative determination of pinoresinol in Taxus x media Rehder needles, cell suspension and shoot cultures
Autorzy:
Mistrzak, P.
Celejewska-Marciniak, H.
Szypula, W.J.
Olszowska, O.
Kiss, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/56453.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
identification
quantitative determination
pinoresinol
Taxus x media
needle
cell suspension
shoot culture
Opis:
The aim of our study was to investigate the presence and quantitative contents of lignans in the tissues of Taxus ×media. The presence of the lignans: pinoresinol, matairesinol and secoisolariciresinol was assessed in needles, shoots cultures and suspension culture. Pinoresinol was the only lignan found in the tissue of T. ×media. The total pinoresinol content in the needles and in the shoots was 1.24 mg/g dry weight (dw) and 0.69 mg/g dw, respectively. Most of the pinoresinol identified was appeared glycosidically bound. In needles, the amount of glycosidically bound pinoresinol (0.81 mg/g dw) was about twice as high as that of free pinoresinol (0.43 mg/g dw). The content of free and glycosidically bound pinoresinol showed the level of 0.18 mg/g dw and 0.51 mg/g dw, respectively in the in vitro shoot cultures. In the cell culture, no pinoresinol was found.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strong potential for endozoochory by waterfowl in a rare, ephemeral wetland plant species, Astragalus contortuplicatus (Fabaceae)
Autorzy:
Lovas-Kiss, A.
Sonkoly, J.
Vincze, O.
Green, A.J.
Takacs, A.
Molnar, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/56900.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
strong potential
endozoochory
waterfowl
rare species
wetland
plant species
Astragalus contortuplicatus
Fabaceae
germination
experiment
mallard
seed dispersal
seed ecology
seed viability
Opis:
It was proposed previously that passive dispersal by migratory aquatic birds explain the widespread distribution of many wetland organisms. Several experimental studies have shown that many widespread wetland plant species can be readily dispersed within the guts of Anatidae. However, it is unclear whether plants with a more restricted distribution are able to disperse via waterbirds. This paper addresses the dispersal ability and germination ecology of the little-known Hungarian milkvetch Astragalus contortuplicatus, which occurs on banks of continental rivers and has a limited and unpredictable distribution. To test whether limited capacity for endozoochory by waterfowl could explain the sporadic appearance of this species, we force-fed ten captive mallards (Anas platyrhynchos) with 100 milkvetch seeds each. Droppings were collected for up to 45 h after feeding. Intact and viable seeds were found in the droppings of each mallard, and altogether 24.7% of seeds fed were recovered intact. The proportion of retrieved seeds that germinated (27.0%) was significantly higher than that of untreated control seeds (0.5%), but significantly lower than that of mechanically scarified seeds (96.0%). Retrieved seeds that germinated developed into healthy mature plants. Given the average flight velocity of mallards, seeds of A. contortuplicatus may travel up to 1600 km inside the digestive tract of migrating individuals. Our results suggest that avian vectors may be more important for the dispersal of rare higher plants (especially those with a hard seed-coat) than hitherto considered. Moreover, they suggest that rarity does not necessarily indicate limited dispersal ability, and may instead be explained by specific habitat requirements.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zarządzanie stanem technicznym napędów pomp krytycznych
Condition Management of Critical Pump Drivers
Autorzy:
Kiss, A.
Nowicki, R.
Powiązania:
https://bibliotekanauki.pl/articles/1368039.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
stan techniczny
diagnostyka silnika
pęknięte pręty wirnika
UR bazujące na stanie technicznym
technical condition
motor diagnostics
broken rotor bars
condition based maintenance
Opis:
This paper describes various analysis used for technical condition diagnostics of electric motors used as pump drivers and oriented on recognition of broken rotor bars. There are discussed two case studies. The 1st one is dedicated to a motor driving a barrel pump operating as a water cutting pump on delayed cooking unit. The 2nd study considers an aggregate monitored by an anomaly detecting system.
W artykule omówiono wykorzystanie różnego typu analiz dla diagnostyki silników elektrycznych wykorzystywanych do napędów pomp i zorientowanych na pęknięcia prętów wirnika. Pokazano dwa przykłady analiz. Pierwszy z nich dotyczy silnika napędzającego krytyczną pompę garnkową na instalacji opóźnionego koksowania, drugi natomiast dotyczy agregatu nadzorowanego z pomocą sprzętowego systemu detekcji anomalii.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 1, 105; 175-181
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polyphenol composition of extract from aerial parts of Circaea lutetiana L. and its antioxidant and anti-inflammatory activity in vitro
Autorzy:
Granica, S.
Piwowarski, J.P.
Kiss, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/19454.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The chemical composition and bioactivity of a water/methanol extract prepared from aerial parts of Circaea lutetiana were determined. HPLC-DAD-MS3 analysis revealed the presence of 14 different compounds comprising phenolic acids, ellagitannins and flavonoids. Antioxidant assays showed the extract's strong scavenging activity towards DPPH (SC50 33.1±3.1 μg/ml), O2 - (SC50 4.0±2.3 μg/ml) and H2O2 (SC50 below 2 μg/ml). Enzyme-based studies revealed that Circaea lutetiana extract inhibits the activity of hyaluronidase (IC50 13.3±2.4 μg/ml) and lipoxygenase (IC50 44.7±1.4 μg/ml). These results support some traditional uses of Circaea lutetiana.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2013, 55, 1
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^1H$ NMR on $(Ni_xMn_{1-x})_3[Cr(CN)_6]_2 \cdot nH_2O$
Autorzy:
Bokor, M.
Tompa, K.
Kiss, L.
Zentková, M.
Zentko, A.
Mihalik, M.
Maťaš, S.
Mitróová, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1813831.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ga
75.50.Xx
76.60.Lz
Opis:
We report on $\text{}^1H$ NMR of $(Ni_xMn_{1-x})3[Cr(CN)_6]_2 \cdot 15H_2O$ hexacyanochromates, where x changes from 0 to 1. The decay time constants of the free induction decay signals described by an effective spin-spin relaxation time $T_{2eff}$ obtained from M(t) = $M_0 \text{exp}(t//T_{2eff})$ decrease as the local magnetic moments increase produced by the magnetic transition metal ions at the sites of the resonant $\text{}^1H$ nuclei. The recovery of the magnetization in the spin-lattice relaxation time $(T_1)$ experiments was single-exponential.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 485-488
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of deuterium content of water on the growth of plant embryo and free radical producing processes
Autorzy:
Kiss, S A
Varga, I.S.
Powiązania:
https://bibliotekanauki.pl/articles/14566.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
seedling mass
natural water
plant seed
producing process
free radical formation
plant growth
water
plant embryo
seedling length
deuterium content
Opis:
In the course of germinating plant seeds - if the deuterium (D) concentration in the germinating medium (water) is lower or higher than in natural water (150 ppm) - the length and mass of seedlings (coleoptil, epicotyl, root) proportionally decrease. The cause of the decrease owing to the changed D concentration is explained partly on energetic - partly on free radical basis and proved by measuring. In waters with lower or higher than natural D concentration the energy supply decreases while the free radical formation increases. Free radicals exert their influence by inactivating the bios substances (e.g. auxin) through oxidation. This seems to explain the mechanism of the ensuing changes.
Źródło:
Journal of Elementology; 2007, 12, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The toxic effect of aluminium and its supposable mechanism in Drosophila
Autorzy:
Kiss, A S
Kiss, I.
Csikkel-Szolnoki, A.
Powiązania:
https://bibliotekanauki.pl/articles/15648.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
toxic effect
aluminium
magnesium
sodium
Drosophila
membrane rigidity
Drosophila melanogaster
toxicity mechanism
Opis:
During the early epoch of biological evolution, aluminium was not available for the primitive organisms because of the low solubility of aluminium compounds. This can explain why aluminium is toxic for the present-day living organisms. We studied the toxic effect of aluminium by feeding Drosophila melanogaster adults for 24 hrs. with a 1% sugar solution containing different concentrations of aluminium sulphate. The effect of magnesium chloride was also tested in combination with aluminium. After 24 hrs. we calculated the survival rate, and solubilised the flies in concentrated nitric acid in a microwave oven. The Al, Na, Mg and Zn content of the solubilised flies was measured with the ICP-AES method. We found no change in the Zn content while the Al and Mg content changed according to the treatment, and the Na content decreased significantly (20-30%) in all the cases. We suppose that the flies were mainly killed by the elevated sodium efflux resulting in a decreased intracellular pH. The cause of the elevated Na efflux could be the increased rigidity of the cell membrane caused by the aluminium. We discuss the experimental results and the supposable mechanism of toxicity.
Źródło:
Journal of Elementology; 2007, 12, 4; 281-285
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of magnesium in the supposed mechanism of anaesthesia
Autorzy:
Kiss, S.A.
Galbacs, Z.
Galbacs, G.
Powiązania:
https://bibliotekanauki.pl/articles/14886.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
magnesium
anesthesia
fluidity
ion transport
membrane
Opis:
The anaesthetic, narcotic effect of magnesium has been discussed since the publication of Meltzer-Auger (1906), but its mechanism has not been clarified. Since then, other investigations have also been performed, but none of the publications has explained the issue. We propose a mechanism analogous to the studies made by Feinstein (1964), who examined organic compounds showing anaesthetic effects. Our view is that magnesium abridges two phospholipids of the opposite sides of the membrane through their phosphate groups. This binding results in membrane rigidity, which makes the ion permeability provided by the ion channel and/or carrier decrease or discontinue, thus the halting of the Na+, K+ and Ca2+ ion flow eventually causes an anaesthetic effect. Another possible pathway is that magnesium ions block the activity of N-methyl-D-aspartate (NMDA) receptor to control the ion channel, which also lowers the permeability of the membrane.
Źródło:
Journal of Elementology; 2006, 11, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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