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  1. 13 Oceanologia

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  1. 8 Pempkowiak J.

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1
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Content available

Synthesis and properties of model humic substances derived from gallic acid

100%
Slawinska D., Polewski K., Rolewski P., Slawinski J.
International Agrophysics
|
2007
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tom 21
|
nr 2
2

Impact of humic substances on the structure of the vegetation of hardwater lakes

100%
Bociag K.
Publications of the Department of Plant Taxonomy of the Adam Mickiewicz University in Poznan
|
2000
|
tom 10
3

Outline of the history of studies on the effect of humic compounds on algae

86%
Guminski S.
Oceanologia
|
1983
|
tom 17
4

Humic substances in the Baltic sediments. I. Isolation and preliminary characterization of humic substances

86%
Bojanowski R., Pempkowiak J., Kupryszewski G.
Oceanologia
|
1977
|
tom 07
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The content of anthocyanin in potato plants in an in vitro culture on the media with different humic products

86%
Klocek J., Costa G., Mioduszewska H.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2015
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tom 96
|
nr 1
6

The trends of lake trophy evolution due to allochthonous humic substances

86%
Wojciechowski I.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
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1990
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tom 43
7

The origin of humic substances and their role in the aquatic environment

86%
Szpakowska B.
International Journal of Ecohydrology and Hydrobiology
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2003
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tom 03
|
nr 2
165-172
8

Supporting the process of removing humic substances on activated carbon

86%
Olesiak P., Stepniak L.
Acta Biochimica Polonica
|
2014
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tom 61
|
nr 4
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Chemical composition of compost from municipal waste in the context of use as fertiliser

86%
Becher M., Symanowicz B., Jaremko D., Trzcinska E.
Acta Agrophysica
|
2018
|
tom 25
|
nr 3
10

The role of biogeochemical barriers in water migration of humic substances

86%
Szpakowska B., Zyczynska-Baloniak I.
Polish Journal of Environmental Studies
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1994
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tom 03
|
nr 2
This paper discusses research into the seasonal variability of concentrations of total carbon (TC), dissolved organic substances (DOC), and humic substances (HS) migrating with ground water from cultivated fields. Moreover, the effects of biogeochemical barriers such as meadow belts, shelterbelts and small field ponds on limiting migration of the chemical compounds in the agricultural landscape were analysed. It was found that ground water of the studied area contains high concentrations of all examined elements averaging from 44.7 to 73.1 mg/1 of TC, from 224 to 43.6 mg/1 of DOC, and from 6.84 to 20.3 mg/1 HS. It was shown that a 20 m wide meadow belt reduces concentration of TC in ground water by 29%, that of DOC by 44%, and HS by 52%. Moreover, it was found that surface waters of the studied area also contain high concentrations of TC (mean from 65.7 to 78.3 mg/1), DOC (47.8 mg/1), and HS (from 21.3 to 34.0 mg/1). The study results show that such biogeochemical barriers as meadow belts and small field ponds effectively limit the spread of organic compounds migrating with ground water through agricultural landscapes.
11

Changes in the vegetation of softwater lakes under the influence of humic substances

86%
Bociag K., Szmeja J.
Polish Journal of Ecology
|
2001
|
tom 49
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nr 4
12

Development and metabolic activity of bacteria isolated from polyhumic Stegwica Lake

86%
Donderski W., Walczak M., Wodkowska A.
Polish Journal of Environmental Studies
|
1997
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tom 06
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nr 5
This study concerns developmental intensity and metabolic activity of heterotrophic bacteria isolated from water of the littoral and pelagial zones of the polyhumic lake Stęgwica. The experiments were carried out with humic substances and [3H]-glucose in media with pH 6.0 and 8.0. It was found that the development and metabolic activity of most strains in the presence of humic substances were higher in the medium with pH 8.0 than in that with pH 6.0. It was found that humic substances in acid medium had an inhibitory effect on the development and metabolic activity of 90% of the strains of bacteria isolated from littoral zone and of 50% of the strains isolated from the pelagial zone.
13

Comparison of concentrations of chemical components in surface waters from agricultural areas of Lithuania and Poland

86%
Zyczynska-Baloniak I., Szpakowska B., Grabauskiene I., Baubinas R.
Polish Journal of Environmental Studies
|
1993
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tom 02
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nr 2
The aim of this paper is to compare the chemistry of surface waters taken from two areas: Poland (Wielkopolska) and Lithuania. These two areas have different environments and different agricultural utilization. The high concentration of both nutritive compounds and dissolved humic substances were found in the Wielkopolska Region, where a great proportion of cultivated fields and intensive agrotechnics are observed. Surface waters located in Lithuania, with a high percentage of wasteland such as bogs, pastures and meadows, showed much lower concentrations of the analysed components. The analysis of content of heavy metals in surface waters showed much greater concentrations of manganese, lead and zinc in Lithuanian water, which can be related to considerable atmospheric pollution of this area.
14

The role of mid-field ponds in the storage of dissolved organic compounds [DOC] and heavy metals

86%
Zyczynska-Baloniak I., Jaskulska R., Szteke B.
Polish Journal of Environmental Studies
|
1996
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tom 05
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nr 4
This paper presents a study on the concentration of dissolved organic carbon (DOC) and humic substances (HS) in the waters of two different small ponds located in agricultural environments. DOC and HS content is high in the water of pond R adjacent to cultivated fields (DOC 42.0 mg/1, HS 34.2 mg/1) and in pond H surrounded by a wide belt of meadow and settled by macrophytes (DOC 48.0 mg/1, HS 37.2 mg/1). The total amounts of cations and cations bounded with humic substances dissolved in water of these two ponds have been analyzed. These studies indicate that small field ponds are a good biogeochemical barrier controlling organic compound migration with water from arable fields into water reservoirs.
15

Effect of peat-bog reclamation on the physico-chemical characteristics of the ground water in peat

86%
Banas K., Gos K.
Polish Journal of Ecology
|
2004
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tom 52
|
nr 1
The authors determined the concentration of dissolved organic carbon (DOC) and electrical conductivity, as well as the colour and pH in the ground waters of 26 peatbogs in Pomerania (NW Poland). Three kinds of peat-bogs have been taken into account – forestless sphagnum-cover bogs, bog coniferous forests and birch swamps. The condition of bogs was classified as good, moderate or poor as regards their natural qualities. In good natural-status peat-bogs the lowest amounts of DOC (about 30 mg C dm⁻³) and conductivity (<100 µS cm⁻¹) were found in the water of the peat of sphagnumcover bogs, higher levels were recorded in forest peat-bog water (DOC – 50 mg C dm⁻³, conductivity – 100 µS cm⁻¹). Drainage of all the kinds of peat-bog under study leads to an increase in the concentration of DOC (>70 mg C dm⁻³) and conductivity (up to 90 µS cm⁻¹ in degraded sphagnum-cover bogs and 140–150 µS cm⁻¹ in degraded forest bogs); there also occurs an increase in acidity (from pH 4.0–3.7 to 3.7–3.4) and coloration (from 300 to 1000 mg Pt dm⁻³ in forestless peat-bogs and from 600–800 to 1400–1600 mg Pt dm⁻³ in forest bogs).
16
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Content available

Influence of humic substances on results of the spectrophotometric (TPTZ) analysis of monosaccharides

86%
Grzybowski W., Dudzinska M.
Oceanologia
|
2004
|
tom 46
|
nr 3
A spectrophotometric method of monosaccharide analysis was assessed with regard to its non-selectivity towards humic substances. Analysis of model solutions showed that it responds positively to both marine and terrestrial humics. The systematic error in monosaccharide analysis (in glucose equivalents) was 0.18–0.20mg per 1 mg of Aldrich humic acid and 0.11–0.12 mg per 1 mg of humic substances isolated from Gulf of Gdańsk water.
17
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Content available

Biodiversity of phytoplankton in hydrochemically different types of humic lakes in the Drawienski National Park

86%
Joniak T., Kraska M.
Acta Agrophysica
|
2006
|
tom 07
|
nr 2[133]
18

Impact of humic substances on Sphagnum denticulatum habitats

86%
Banas K.
Acta Societatis Botanicorum Poloniae
|
2002
|
tom 71
|
nr 1
19

Tendencies of changes in the flora and vegetation structure of Pomeranian lakes under the influence of humic substances

86%
Szmeja J.
Publications of the Department of Plant Taxonomy of the Adam Mickiewicz University in Poznan
|
2000
|
tom 10
20

Impact of humic substances on bacterioplankton in eutrophic lake

86%
Burkowska A., Donderski W.
Polish Journal of Ecology
|
2007
|
tom 55
|
nr 1
This paper presents the results of resarch on impact of humic substances (HS) on bacterioplancton in eutrophic Lake Jeziorak (north-eastern Poland). In cultures of natural bacteria from the lake water, enriched with 0, 5, 10, 25 and 50 mg dm⁻³ of HS (natural HS – isolated from lake water or commercial HS – sodium salt of humic substance; Sigma-Aldrich), were determined the following parameters: total number of bacteria (TNB), number of heterotrophic bacteria (CFU), bacterial production (BP) (measured with [³H]methyl thymidine method) and general activity of esterases. Natural HS had a more positive impact on bacterial growth, bacterial production and activity of esterases than the commercial preparation HS. The highest TNB and CFU was observed when the water was enriched with 25 mg dm⁻³ of natural HS. All concentrations of the natural HS stimulated bacterial production. The activity of hydrolytic enzymes increased with rising concentrations of natural HS.
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