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Wplyw poziomu azotanow na emisje N20 z wybranych gleb w badaniach modelowych

100%

Stepniewska Z., Szmagara A.

Acta Agrophysica

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2000

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tom 38

209-219

Celem pracy było określenie wpływu poziomu azotanów w glebie na tempo denitryfikacji, mierzonej ubytkiem azotanów oraz ilością emitowanego podtlenku azotu. Do badań wybrano: glebę płową- Apglp.glp oraz dwie gleby brunatne - Bli i Bpgm-gc.sk, które wzbogacono dawkami azotanów do wartości odpowiadającej nawożeniu 100 i 200 kg N-NO3/ha. Emisja podtlenku azotu z gleby rozpoczęła się już w pierwszych trzech dniach, a jej wielkość maksymalna zależała nie tylko od dawki wprowadzonych azotanów (V), ale była przede wszystkim związana z cechami rodzajowymi gleby, które określają jej potencjalną zdolność do denitryfikacji i przy tym samym poziomie azotanów (V) była dwukrotnie większa w glebie brunatnej, w której zawartość węgla organicznego wynosiła 0,98% w porównaniu z glebą A o poziomie węgla organicznego równym 0,73%.

2

Effect of acetylene block on measurements of N2O emission from soils

100%

Stepniewska Z., Szmagara A.

International Agrophysics

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2004

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tom 18

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nr 2

3

Ellagic acid content in selected wild species of fruit roses

81%

Karczmarz K., Szmagara A., Stefaniak E. A.

Acta Scientiarum Polonorum. Hortorum Cultus

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2019

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tom 18

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nr 5

Ellagic acid (EA) is a natural antioxidant, belonging to the group of polyphenolic compounds. It displays a broad spectrum of pro-health effects, ranging from the prevention of cancer to antiviral properties. It is present in many fruit from the rose family (Rosaceae): strawberries, raspberries, blackberries and walnuts as well as cranberries and grapes. The available literature states that the fruit of roses, in addition to their aesthetic and functional applications, also show therapeutic properties, which, among other things, are associated with a high content of polyphenols, including ellagic acid derivatives. The aim of this research was to determine the differences in the content of free ellagic acid in the fruit of selected rose species. The test material consisted of freeze-dried sublimation and ground fruit from the following species of roses: R. canina, R. moyesii, R. pendulina. The fruit was separated into two fractions: flesh and seeds. Quantitative analysis of free ellagic acid was carried out by spectrofluorimetry. The free EA was present both in the flesh and in the seeds of the studied species of roses. Its content in the mentioned fractions varied depending on the species. The flesh of R. pendulina was characterised by the highest level of EA in free form (247.72 μg·g–1 of dry weight). The seeds of R. moyesii proved to be the most abundant in free EA (105.69 μg·g–1 of dry weight).

4

Okreslenie 'natywnych' zawartosci azotanow [V] w glebach uprawnych Polski

81%

Stepniewska Z., Szmagara A., Ostrowski J.

Acta Agrophysica

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2003

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tom 84

129-136

5

Pharmacokinetics of propofol in rainbow trout following bath exposure

71%

Gomulka P., Fornal E., Berecka B., Szmagara A., Ziomek E.

Polish Journal of Veterinary Sciences

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2015

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tom 18

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nr 1

Propofol, 2,6-diisopropylphenol, seems to be a good candidate as a fish anaesthetic, however, no study regarding propofol influence on fish has yet been reported. The aim of this study was to examine propofol pharmacokinetics in rainbow trout (Oncorhynchus mykiss) following bath exposure. Fish (n = 100) were exposed to an aqueous propofol bath at 12°C and 17°C; propofol concentration in the bath was 10 mg L(-1). Plasma concentration-time profiles were determined using LC-MS, and pharmacokinetic parameters were calculated. Propofol was absorbed quickly at both temperatures. Its concentration reached 13.8 ± 2.7 μg mL(-1) and 16.1 ± 2.1 μg mL(-1) at 12°C and 17°C, respectively, during the first minute of exposure. Blood plasma propofol decreased rapidly to 6.8 ± 0.7 μg mL(-1) and 6.3 ± 2.2 μg mL(-1) at 12°C and 17°C respectively, during the first 10 minutes of the recovery. The half-life time of propofol was 1.5 h and 1.1 h at 12°C and 17°C, respectively. We found propofol anaesthesia in trout effective and safe. However, it caused a gradual decrease of respiratory rate, and therefore a specific anaesthesia protocol should be developed.

6

A contribution to the assessment of potential denitrification in arable mineral soils of Poland

71%

Glinski J., Stepniewska Z., Stepniewski W., Ostrowski J., Szmagara A.

Journal of Water and Land Development

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2000

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nr 04

The main mechanism responsible for N20 production in agroecosystems is denitrification of nitrates (V) under hypoxic conditions, which occur e.g., after intensive precipitation or at high ground water level. The calculations of potential denitrification were performed for surface horizons from 672 soil profiles representing 25 main soil units of Polish soils. A proposal of the assessment of potential denitrification rate on the basis of the nitrate content, humus horizon thickness, its bulk density and of previously investigated soil redox resistance in the form of indicators tm and tm is presented. The proposal is based on the assumption that denitrification is linear with time and is illustrated for the temperature of 20°C. It was shown, that the highest potential denitrification would occur in Rendzic Leptosols and in the soils developed from loess i.e. Phaeozem, Cambisol and Luvisol, while the lowest <5 kg ha-1d-1 N - in Luvisols developed from loose sands, loams and skeleton loams. Evaluation of spatial distribution of the potential denitrification rate at current nitrate content in mineral soils of Poland has been attempted in the form of a map.

Ograniczanie wyników

2 Acta Agrophysica

1 Acta Scientiarum Polonorum. Hortorum Cultus

1 International Agrophysics

1 Journal of Water and Land Development

1 Polish Journal of Veterinary Sciences

6 Szmagara A.

4 Stepniewska Z.

2 Ostrowski J.

1 Berecka B.

1 Fornal E.

1 Glinski J.

1 Gomulka P.

1 Karczmarz K.

1 Stefaniak E. A.

1 Stepniewski W.

1 Ziomek E.

1 2019

1 2015

1 2004

1 2003

2 2000

Wplyw poziomu azotanow na emisje N20 z wybranych gleb w badaniach modelowych

Effect of acetylene block on measurements of N2O emission from soils

Ellagic acid content in selected wild species of fruit roses

Okreslenie 'natywnych' zawartosci azotanow [V] w glebach uprawnych Polski

Pharmacokinetics of propofol in rainbow trout following bath exposure

A contribution to the assessment of potential denitrification in arable mineral soils of Poland