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Wyszukujesz frazę "Strachel, R." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Deliberations on zinc - a trace mineral or a toxic element?
Autorzy:
Strachel, R.
Zaborowska, M.
Wyszkowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/961387.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
zinc
trace element
toxic element
sustainable development
toxicity
plant nutrition
microbiological activity
biochemical activity
Opis:
The paper gives a comprehensive insight into the role of zinc in the biosphere. It reviews numerous functions of this metal at various levels of the organisation of ecosystems. An attempt has ben made to assess its importance as a microelement, while not neglecting its toxicity due to excessive accumulation of zinc in the environment. Zinc is a natural component of the Earth's crust, but in many places it has accumulated in amounts near or above the safe levels. Currently, the use of this metal is very broad, and therefore attention should be drawn to possible consequences arising from elevated levels of zinc in the environment. Dispelling controversies surrounding heavy metals is a necessary step for gaining systematic and wider knowledge on these elements. This in turn will create an opportunity for the development of strategies and subsequent actions undertaken by everyone, from individuals to major international industrial corporations, aimed at achieving homeostasis in an environment polluted with heavy metals. Increased levels of zinc can adversely affect microbiological and biochemical processes occurring in the soil and the development of plants, which has a negative impact on the quantity and quality of crops. Therefore, low bioavailability of heavy metals, including zinc, in agricultural land is a key to the stability of ecosystems and food security.
Źródło:
Journal of Elementology; 2016, 21, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and potential risk assessment of heavy metals and arsenic in sediments of a dam reservoir: a case study of the Loje Retention Reservoir, NE Poland
Autorzy:
Strachel, R.
Wyszkowska, J.
Baćmaga, M.
Powiązania:
https://bibliotekanauki.pl/articles/958267.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The objective of this study has been to determine the potential toxicological effect of heavy metals accumulated in bottom sediments of a lowland retention reservoir located in north-eastern Poland. For this purpose the ecotoxicological (TEL, PEL) criteria were selected to quantify sediment contamination. The potential ecological risk was assessed. The analyzed reservoir was characterized by significant spatial variations in heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) and As related to organic carbon (Corg.) concentrations in bottom sediments during its 30-year-long life. Thus, the highest organic matter content and heavy metals accumulation was reported in the reservoir’s riverine and transitional zones, whereas predominance of mineral fractions did not favor metal content in the lacustrine zone. One kilogram of sediment dry matter contained 39.9 mg Zn, 20.5 mg Pb, 11.0 mg Cr, 9.1 mg Ni, 7.2 mg Cu, 1.29 mg As and 0.39 mg Cd on average. Nonmetric multidimentional scaling (NMS) revealed distinct elemental fingerprints in each sampling site, while two-way hierarchical agglomerative cluster analysis (TWHCA) provided insight to metal association and pollution distribution. It emerged that the riverine and transitional zones of the reservoir underwent progressively increasing contamination of the sediments, mainly due to a high content of Cd, Cr, Cu, Ni and Pb, although only three of these metals, i.e. Cd, Ni and Pb, reached levels that could produce an adverse effect on aquatic organisms. The application of geochemical and ecotoxicological indices is a helpful tool for the risk assessment of environmental pollution, as well as a tool supporting decision-making for water source security.
Źródło:
Journal of Elementology; 2017, 22, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbiome of soil contaminated with zinc
Autorzy:
Strachel, R.
Wyszkowska, J.
Baćmaga, M.
Powiązania:
https://bibliotekanauki.pl/articles/958271.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The accumulation of heavy metals in the environment can contribute to soil homeostasis disturbance. However, their adverse effect can be reduced by introducing neutralizing substances to soil. Therefore, an experiment was carried out to determine the effect of varied doses of zinc on the microbiological and enzymatic properties of soil. Additionally, the neutralizing effect of liming applied to zinc-contaminated soil was evaluated with regard to the microbiological and biochemical properties of the soil. Loamy sand of pHKCl 5.6 was used as the soil material. Calcium carbonate was applied in doses neutralizing the hydrolytic acidity of soil, which amounted to 0, 1 and 2 HAC, respectively. Next, zinc (ZnCl2) was introduced to soil, in the amounts of 0, 250, 500, 750, 1000 and 1250 mg kg-1 DM of soil. In weeks 2 and 20 of the experiment, the counts of microorganisms (organotrophic bacteria, copiotrophic bacteria, oligotrophic bacteria, actinomycetes and fungi) and activity of enzymes (dehydrogenases, catalase, urease, acid phosphatase, alkaline phosphatase and β-glucosidase) were determined in soil samples. Based on observations of the proliferation of microorganisms, changes in the diversity of the soil microbiome exposed to zinc were evaluated with the use of the colony development (CD) index and ecophysiological biodiversity (EP) index. Excessive amounts of zinc demonstrated a negative effect on the biological parameters of soil. It brought about a reduction in the count of microorganisms, although the highest resistance to zinc was demonstrated by copiotrophic bacteria and fungi. Additionally, this element revealed an inhibitory effect on the activity of soil enzymes and colony development index, as well as on the ecophysiological biodiversity (EP) index of microorganisms. The addition of calcium carbonate to the soil neutralized the negative effects of zinc on its microbiological and biochemical properties.
Źródło:
Journal of Elementology; 2017, 22, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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