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Mińsk Mazowiecki, Poland

The paper concerns characterization of daily course of air temperature in days with spring and autumn frosts depending on kind of air mass. The study was based on the data collected from 2003 to 2010 by automatic station, situated in the west side of Bydgoszcz. The paper shows, among other things, terms of appearance and disappearance subzero temperature in days with spring and autumn frosts depending on kind of air mass. Source

Stepczynska M.,University Kazimierza Wielkiego | Walczak M.,Nicolaus Copernicus University | Zenkiewicz M.,Instytut Inzynierii Materiatow Polimerowych i Barwnikow
Przemysl Chemiczny

Effect of corona discharge in air on mortality rate of Escherichia coil, Staphylococcus aureus, Salmonella enteritidis, Bacillus subtilis and Pseudomonas aeruginosa strains In agar basis was detd. at 23°C, 1-20 kJ/m2 and test sample sweep speed 0.48-96 mlmin. The treatment resulted in an Increased mortality of the studied bacterial strains (up to 44.9%) except for Bacillus subtiis (0.47-4.28% only), where the discharge-resistant endospores existed. Source

Polypropylene and poly(vlnyl chloride) waste were disintegrated in a lab. multi-edge grinder equipped with drums or discs with round or polygon holes (500-2100 rpm) to det. the energy consumption for comminution. The energy losses were only 0.5-0.67% of the energy reserves in the disintegrated polymer waste. Source

Stepczynska M.,University Kazimierza Wielkiego | Zenkiewicz M.,Instytut Inzynierii Materialow Polimerowych i Barwnikow
Przemysl Chemiczny

Surface layer of polylactid films (thickness 100 μm) was treated with corona discharge in air or in He to improve their adhesive properties. Changes of the chem. structure of the corona-treated layers was studied by photoelectron spectroscopy to det. the oxidn. degree. The He atm. used was more efficient than the air one. Source

Oddou-Muratorio S.,French National Institute for Agricultural Research | Bontemps A.,French National Institute for Agricultural Research | Klein E.K.,French National Institute for Agricultural Research | Chybicki I.,University Kazimierza Wielkiego | And 2 more authors.
Forest Ecology and Management

The comparison between estimates of historical gene flow, using variance in allelic frequencies, and estimates of contemporary gene flow, using parentage assignment, is expected to provide insights into ecological and evolutionary processes at work within and among populations. Genetic variation at microsatellite loci was used to quantify genetic structure in two wind pollinated, gravity and animal-dispersed tree species (Fagus sylvatica L. and Fagus crenata Blum.) and to derive historical estimates of gene flow. The gene dispersal distances estimated assuming effective population density to be 1/4 of the observed density were ∼77 m in European beech and ∼40 m in Japanese beech. Parentage analyses and a neighbourhood model approach were used to estimate contemporary patterns of seed and pollen dispersal. Our results suggest restricted seed dispersal abilities in both European beech (δs = 10.5 m) and Japanese beech (δs = 12.4 m), with an exponential shaped seed dispersal kernel. A non-negligible rate of seed immigration (ms = 27%) was detected in European beech sites but not in Japanese beech site. Pollen dispersal within studied sites also appeared limited (δp = 41.63 m in European beech and δp = 79.4 m in Japanese beech), despite high rate of pollen immigration (mp = 68% in European beech and mp = 40% m in Japanese beech). Interestingly, contemporary and historical estimates of gene flow were within the same order of magnitude (a few tens of meters). © 2010 Elsevier B.V. All rights reserved. Source

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