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1

Chemical diversity within strawberry [Fragaria vesca L.] species

100%
Najda A., Dyduch M.
Herba Polonica
|
2009
|
tom 55
|
nr 3
140-146
The chemical diversity within wild strawberry (Fragaria vesca L.) species was studied depending on its origin (natural vs cultivated). The herb was collected at the full flowering stage. Following items were determined in collected material: flavonoids, phenolic acids, tannins, anthocyanins, as well as anti-oxidation activity (%) was evaluated by means of ability to neutralize the DPPH radicals. Contents of studied biologically active substances depended on the plant origin. Extracts made from examined raw materials showed no differences in the ability to reduce DPPH radicals to diphenylopicrylohydrazine.
2

Effect of land use and lake presence on chemical diversity of the Lyna River system

100%
Glinska-Lewczuk K.
Polish Journal of Environmental Studies
|
2006
|
tom 15
|
nr 2
This paper presents results of three years of geochemical research carried out in the upper Łyna catchment in NE Poland. Water in the system is of Ca²⁺ - HCO₃⁻ - SO₄²⁻ type and reflects mainly the impact of chemical weathering of bedrock. The results indicate that natural components such as Ca²⁺ and HCO₃⁻, derived from mineral weathering, dominate chemical composition of the Łyna River system, reaching 90%. However, agricultural input is clearly visible for ions such as Na and K. Under natural conditions their content usually reaches 4.3 and 1.2, respectively, while in the agriculture-dominated subcatchments in the study area the proportion of Na⁺ and K⁺ reached 8.3 and 4.1 mg L⁻¹. Besides land use pattern, the main factors modifying riverine transport of the dissolved substances along watercourses are open lakes. They play an important role as sinks for the ions in agricultural areas. The highest decrease in concentration was stated for K⁺ by 50%, Na⁺ by 36%, SO₄²⁻ by 25%, and Ca²⁺ by 20%. Retention of solutes in lakes is highly dependent on the location within the river catchment and water table area. The largest reservoirs in the region are capable for the retention of 8-12% of the river input. Based on changes in water quality parameters, the Łyna River profile was divided into three distinct zones: headwater zone, middle zone with lakes and lower zone with anthropogenic influences.
3
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Element content of Scots pine (Pinus sylvestris L.) stands of different densities

80%
Skonieczna J., Malek S., Polowy K., Wegiel A.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2014
|
tom 57
|
nr 192
Modern forestry management should be based on the principle of sustainability.In order to preserve habitat productivity, the amount of nutrients removed from the environment along with forestry products must be taken into consideration. This study shows the exact concentrations of chemical elements in different tree parts of Scots pine, growing on poor soils in north-western Poland. The observedvalues were compared to the values found in literature. In addition, the relationship between the concentrations of elements and stem diameter or stand density was researched. The highest concentration of chemical elements was observed in the needles (C, N, P, K, Mg, S, Mn, Na, Fe) and the lowest (C, N, P, S, Cu, Na, Ni, Pb, Zn, Fe) in the stem wood. Most of the macronutrients (P, K, Ca, Mg and S) reached optimal values, with the exception of N showing a deficiency, especially in the needles. The relationship between the content of elements and DBH or stand density was rather weak, and in both cases, negative.
4

Chemical diversity of five natural growing populations of evening primrose (Oenothera biennis L.)

80%
Wardziak O., Kosakowska O., Osinska E.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
|
2007
|
tom 28
5

Comparative study on the developmental and chemical diversity of sweet woodruff [Galium odoratum]

80%
Wardziak O., Osinska E.
Herba Polonica
|
2007
|
tom 53
|
nr 3
Morphological and chemical diversity of three populations of sweet woodruff (Galium odo- ratum L.) was investigated in situ and ex situ. The herb was collected in two stages of plants development: in full blooming and after blooming. Content of coumaric compounds, flavonoids and phenolic acids were determined. Investigated populations didn't differ sig­nificantly as to the morphological features of plants but they did as to the content of the biologically active compounds.The content of investigated pharmacologically active compounds depended both on the location of population and the growth phases of plants.
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