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Structure-dependent phytotoxicity of new aminophosphonates

100%
Bielecki K., Dziamska A., Sarapuk J.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2002
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tom 481
|
nr 1
Electrolyte efflux, chlorophyll, malondialdehyde content and enzymatic activities (catalase, peroxidase) in cucumber cotyledons as well as stability of model lipid membranes in the presence of some new, acyclic and cyclic, aminophosphonates were studied. They also differed in the substituents at the phosphorus and nitrogen atoms. It was found that the effectiveness of the compounds to influence mentioned parameters depended on their lipophilicity and structural features. The most active compounds were these with isopropyl substituents at the P atom unless their hydrocarbon chains at the N atom were not too long. Butyl substituents at phosphorus significantly decreased aminophosphonates efficiency. Similar effect was observed when trans-type hydrocarbon chain was replaced with a short-branched one. It also seems that cyclic compounds with hexane rings were weaker modifiers of model and biological membranes than these with pentane rings. Results show that aminophosphonates interact with plasma membranes and presumably induce oxidative stress.
2

The physicochemical properties of some new aminophosphonates

100%
Kleszczynska H., Sarapuk J., Dziamska A.
Cellular and Molecular Biology Letters
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2000
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tom 05
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nr 4
415-422
The hemolytic activity of some newly synthesized aminomethanephosphonic acid derivatives was studied. The compounds studied differed in their polarity and the hydrophobicity of the electronic substituents at their nitrogen and carbon atoms. It was found that acyclic aminophosphonates exhibited significantly stronger hemolytic properties than cyclic aminophosphonates. To cause the same level of hemolysis of pig erythrocytes, it was necessary to use about a tenfold higher concentration of cyclic aminophosphonates than acyclic ones. The hemolytic activities of the compounds were related to the possibilities of their incorporation into the lipid phase of erythrocyte membranes. Once incorporated, they changed the fluidity of those membranes; the changes were more pronounced in the case of cyclic aminophosphonates. Acyclic compounds were also found to exhibit a slight antioxidative activity, which may be a consequence of their stronger interaction with the membrane lipids. The results obtained in the experiments performed with the use of planar lipid membranes were similar to those obtained in the hemolytic studies, i.e., acyclic aminophosphonates interacted more effectively with those membranes. The general conclusion is that both stereochemistry and hydrophobicity are the factors that determine the efficiency of the interaction of the compounds studied with the model membranes used, and that most likely location of aminophosphonates is the lipid phase of the erythrocyte membrane. Another conclusion is that newly synthesized aminophosphonates may be used as potentially good pesticides.
3

New aminophosphonates - an assessment of their biological activity

100%
Bonarska D., Bielecki K., Dziamska A., Gancarz R., Grzys E., Kleszczynska H., Trela Z., Sarapuk J.
Cellular and Molecular Biology Letters
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2002
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tom 07
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nr Suppl.
4

Membrane-active aminophosphonates

100%
Dziamska A., Sarapuk J.
Cellular and Molecular Biology Letters
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2002
|
tom 07
|
nr 2
5

New aminophosphonates - estimation of their potential pesticidal efficiency

84%
Dziamska A., Bielecki K., Kleszczynska H., Sarapuk J.
Biuletyn Naukowy. Uniwersytet Warmińsko-Mazurski w Olsztynie
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2001
|
tom 12
219-226
6

New aminophosphonates with antioxidative activity

84%
Kleszczynska H., Sarapuk J.
Cellular and Molecular Biology Letters
|
2001
|
tom 06
|
nr 1
7

New aminophosphonates - assessment of biological activity

67%
Sarapuk J., Bonarska-Kujawa D., Bielecki K., Dudra A., Grzys E., Trela Z., Kleszczynska H.
Electronic Journal of Polish Agricultural Universities. Series Biology
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2009
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tom 12
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nr 4
8

Influence od some new aminophosphonates on electrical properties and stability of plasma membranes of plant cells

67%
Sarapuk J., Bielecki K., Trela Z.
Acta Societatis Botanicorum Poloniae
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2002
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tom 71
|
nr 3
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