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1

The study of electrical properties of components of a winter rape seed mixture

Kovalyshyn Stepan, Dadak Viktor, Ptashnyk Vadym, Shvets Oleksiy, Łuczycka Deta, Dróżdż Tomasz, Kiełbasa Paweł, Wesołowski Marcin

Przegląd Elektrotechniczny

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2020

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R. 96, nr 1

60--64

EN

Having conducted the investigation of electrical properties on the example of winter rape (Brassika napus oleifera diennis metzg) and its difficult-to-separate weed – cleavers (Galium aparine), we revealed a significant difference in their dielectric permittivity and the angle of dielectric loss in the wide frequency range. The revealed regularities allowed us to determine the value of the electric charge that can accumulate on the seed material in the separation process, and thus the strength of the electrical interaction between seed and separation surface.

PL

W artykule przedstawiono badania wybranych właściwości elektrycznych, które można wykorzystać do separacji nasion roślin produkcyjnych (Brassika napus oleifera diennis metzg) od nasion roślin niepożądanych (Galium aparine), których parametry geometryczne i masowe są bardzo zbliżone. Odnotowano różnice w przenikalności dielektrycznej oraz oszacowano wartość ładunku elektrycznego, który może gromadzić się w materiale.

2

Evaluation of the possibility of phytostabilization of post-flotation tailing ponds

Krawczyńska M., Kołwzan B., Gediga K., Dziubek A. M., Grabas K., Karpenko E.

Environment Protection Engineering

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2015

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Vol. 41, nr 1

157--167

EN

The effect of organic fertilization and microbiological preparations for phytostabilization of copper ore tailings were examined. It has been shown that the introduction of the pulp, waste from the sugar industry, leads to the mobilization of trace metals. The copper content in aqueous extract of enriched waste was greater than 500-fold higher than in controls. It has also been stated an increase in the toxicity of extracts. While the use of biopreparations for seed treatment contributed to the stimulation of nutrients uptake by plants. In the biomass of plants from treated seeds with a suspension of Azotobacter strain EK, and biosurfactant was found more phosphorus and calcium than in plants from control.

3

A computer system for a human semen quality assessment

Witkowski Ł.

Biocybernetics and Biomedical Engineering

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2013

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Vol. 33, no. 3

179--186

EN

An automatic computer system to assist assessment of a human semen quality is described. The hardware of the system consists of PC with frame grabber and CCD camera connected to an optical microscope with bright field optic. The software of the system consists of four modules: (1) acquisition of real time sequences of semen, (2) assessment of mobility o sperm cells, (3) calculation of density, and (4) morphology examination of sperm cells. There are few commercial CASA (Computer Assisted Semen Analysis) systems that measure a quantity of semen. Some of them measure only one factor of semen whereas others recognize sperm cells based on user-defined parameters. The described system calculates all factors required for semen quality assessment and recognizes sperm cells by its shape, structure and size.

4

Trade-off of sexual and asexual recruitment in a dominant weed Ligularia virgaurea (Maxim.) In alpine grasslands (China)

Wu G., Hu T., Liu Z.

Polish Journal of Ecology

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2010

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Vol. 58, nr 1

81-86

EN

Ligularia virgaurea (Maxim.) is a typical naturally-occurring native noxious weed, widely distributed in alpine grasslands of the Tibetan Plateau, China. Three field sampling plots (30 m ' 50 m) dominated by L. virgaurea were selected to study its population colonization mode and the relationship between sexual- and clonalrecruitment in alpine meadow of the Qinghai-Tibetan Plateau, NW China. Field investigations were conducted on its soil seed bank, seed rain and the individuals of new recruitment (seedlings and ramets) to study its sexual and asexual recruitment. And, 46 individuals which produced the seeds were selected randomly to study their relationship between seed production and ramet production. Results showed that there were more ramets (26.23 ramets m[^-2]) and less seedlings (6.70 seedlings m[^-2]) and a mean value of seed rain was close to 8.04 seeds m[^-2], but the soil seed bank for this species was not found in study sites. Significantly negative correlations (r = -0.416, P <0.001) between seed number per individual and ramet number per adult individual were found for L. vrigaurea in studied alpine grasslands. Our results revealed that clonal reproduction was the main population colonization mode. In addition, there was a significantly negative relationship between seed production and ramets for this species.

5

Komputerowy system wspomagania diagnostyki nasienia

Witkowski Ł.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

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2009

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Vol. 15, nr 4

393-396

PL

W pracy przestawiono kompletny system do komputerowego wspomagania diagnozy andrologicznej. System składa się z trzech modułów przeznaczonych do analizy ruchu, wyliczenia gęstości oraz badań morfologicznych plemników. System współpracuje z mikroskopem optycznym z optyką jasnego pola.

EN

A computer system for semen quality assessment is presented. The system consists of three modules for mobility assessment, density calculation and morphology examination. The system uses an optical microscope with bright field optics.

6

Cherry removal by seed-dispersing mammals : mutualism through commensal association with frugivorous birds

Hernandez A.

Polish Journal of Ecology

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2008

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Vol. 56, nr 1

127-138

EN

The consumption of Wild Cherries Prunus avium (L.) by frugivorous birds and mammals was studied in an area in northwest Spain in summer during July-August 2005, analysing in particular how the fruits were obtained by terrestrial seed-dispersing mammals. During the study cherries were practically the only ripe fleshy fruits available in the area. They were consumed by a variety of birds (16 species), with a very high mean rate of feeding visits (136 birds per hour for 10 trees, n = 4091 feeding visits). Most of these visits were by a priori seed-dispersing birds that usually swallow the fruits whole, in particular the Spotless Starling Sturnus unicolor Temminck, Blackbird Turdus merula L., Blackcap Sylvia atricapilla (L.), and Garden Warbler Sylvia borin (Boddaert). However, the large sizes of the cherries (10-17 mm) and the fact that they were often removed with the stalk attached hindered this to a great extent, especially in birds with small gape width (Sylvia warblers, with gape width <10 mm, accounted for 32% of the total feeding visits). Failure in handling the cherries and their falling to the ground was therefore common, as it was the alternative strategy of pecking the pulp without ingesting the large cherry seed. Most of the fallen cherries had been handled by birds (89% of 1241 cherries collected beneath eight trees), and 52% of the handled cherries still had the stalk attached. The cherries were frequently consumed by seed-dispersing mammals (1133 cherry seeds in 51 droppings of hedgehogs, mustelids and canids). More than 99% of the cherry seeds in mammal droppings were intact (potentially viable for germination). Considering their shoulder-heights (40 cm at the maximum) and the characteristics of the cherry trees (1.92 m mean distance from the ground to the lowest branch, n = 77 trees), seed-dispersing mammals were unlikely to have reached the branches directly from the ground without climbing. The non-climbing species (European Hedgehog Erinaceus europaeus (L.), Eurasian Badger Meles meles (L.), Red Fox Vulpes vulpes (L.) must have obtained all the fruits after they had fallen, and as a whole these species were precisely the main cherry dispersers among the mammals (94% of the total cherry seeds in mammal droppings). Western Polecats Mustela putorius (L.) and Beech Martens Martes foina (Erxleben) consumed cherries and could climb the trees to eat the fruit, and Stoats Mustela erminea (L.) did not consume cherries. Two conclusions in this study are relevant within the European context: 1) not all oversized fruits that often fall to the ground due to the action of seed-dispersing frugivorous birds are wasted, in terms of potential dispersal, and 2) non-climbing terrestrial seed-dispersing mammals can feed on the fruits that have fallen from shrubs and trees not necessarily after post-ripening natural abscission.