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Wyszukujesz frazę "toxic activity" wg kryterium: Temat


Wyświetlanie 1-4 z 4
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:
Toxic effect of cyanobacterial blooms on the grazing activity of Daphnia magna Straus
Autorzy:
Lotocka, M.
Powiązania:
https://bibliotekanauki.pl/articles/48398.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Daphnia magna
Cyanoprokaryota
Aphanizomenon flos-aquae
herbivorous organism
bloom
grazing activity
toxic effect
Microcystis aeruginosa
Opis:
The investigations aimed to determine the impact of cyanobacteria Microcystis aeruginosa (K¨utz.) K¨utz. and Aphanizomenon flos-aquae (L.) Ralfs ex Bornet et Flah., both toxic algae, on the grazing intensity of Daphnia magna Straus. In order to determine the parameter permitting the quantitative determination of the grazing intensity of herbivorous organisms, methods based on the following techniques were applied: microscopy, to determine the degree of gut fullness; spectrophotometry, to determine the levels of chlorophyll a and its degradation products in the food composition; high-performance liquid chromatography (HPLC) to determine the content of exogenous and endogenous carotenoids. Each of these methods confirmed that the tested algae species inhibited grazing intensity in D. magna Straus. The most obvious effects were obtained when M. aeruginosa (K¨utz.) K¨utz. was used as food. With these cyanobacteria, the gut fullness indicator did not exceed 58%, and the chlorophyll a content in the digestive system of the tested D. magna was three times lower than that in the control organisms. It seems that the defensive reaction of organisms was a reversible process. However, the possibility of a long-term, sublethal influence of cyanobacteria on the physiology and internal processes of this species cannot be ruled out.
Źródło:
Oceanologia; 2001, 43, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histochemical study of the nitric oxide synthase activity in experimental trichinellosis
Autorzy:
Hadaś, E.
Gustowska, L.
Boczoń, K.
Janczewska, D.
Powiązania:
https://bibliotekanauki.pl/articles/2148736.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
toxic property
trichinellosis
nitric oxide
morphological transformation
parasitology
muscle cell
signalling property
infectious disease
physiological function
synthase activity
histochemistry
Opis:
Nitric oxide plays a critical role in a variety of biological acfivities. It has been nicknamed a ,,killer'' and ,,mediator" due to its toxic and signalling properties. Apart from its regular physiological function, nitric oxide indirectly participates in infectious diseases. Our report seems to be first presentation of the nitric oxide synthase participation in the host biochemical defence mechanisms and in morphological transformation of muscle cells in trichinellosis.
Źródło:
Wiadomości Parazytologiczne; 1999, 45, 1; 63-68
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histochemical study of the nitric oxide synthase activity in experimental trichinellosis
Autorzy:
Hadas, E
Gustowska, L.
Boczon, K.
Janczewska, D.
Powiązania:
https://bibliotekanauki.pl/articles/839127.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
toxic property
trichinellosis
nitric oxide
morphological transformation
parasitology
muscle cell
signalling property
infectious disease
physiological function
synthase activity
histochemistry
Opis:
Nitric oxide plays a critical role in a variety of biological acfivities. It has been nicknamed a ,,killer'' and ,,mediator" due to its toxic and signalling properties. Apart from its regular physiological function, nitric oxide indirectly participates in infectious diseases. Our report seems to be first presentation of the nitric oxide synthase participation in the host biochemical defence mechanisms and in morphological transformation of muscle cells in trichinellosis.
Źródło:
Annals of Parasitology; 1999, 45, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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