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Szop pracz - nowy drapieznik w polskich lasach

100%

Lapinski S. , Cholewa E.

Wszechświat

2008

tom 109

nr 04-06

120-122

Elektrolityczne powłoki stopowe cynku - kierunki rozwoju i zastosowanie

80%

Cholewa E. , Lutze R. , Kwiatkowski L. , Okurowski W.

Inżynieria Powierzchni

2007

tom nr 2

24-31

Przedstawiono nowe kierunki rozwoju w dziedzinie powłok stopowych cynku. Omówiono wtaściwości funkcjonalne i zastosowanie podwójnych powłok stopowych cynku z niklem, kobaltem, żelazem, chromem, manganem, molibdenem. Opisano wpływ prądu impulsowego na proces osadzania i właściwości powłok stopowych cynku. Przedstawiono wyniki badań korozyjnych i morfologii powierzchni dla stopów Zn-Ni osadzonych w warunkach prądu impulsowego. Otrzymano powłoki drobnoziarniste i błyszczące.

This paper illustrates actual trends in electroplating of Zn alloy coatings. Functional properties and applications of the binary alloy systems of zinc with nickel cobalt, iron, chromium, manganese, molybdenum are presented. The influence of pulse parameters on the electrodeposition process and various properties of Zn alloy coatings is also discussed The paper presents the results of corrosion and surface morphology investigations of Zn-Ni alloy coatings deposited by pulse current Fine grained and bright Zn-Ni alloy coatings were obtained.

In vitro-regenerated weltand sedge Eriophorum vaginatum L. is genetically stable

70%

Rewers M. , Kisiala A. , Drouin J. , Sliwinska E. , Cholewa E.

Acta Physiologiae Plantarum

2012

tom 34

nr 6

Eriophorum vaginatum L. is a promising species for phytostabilization, restoration, or creation of wetlands, because it can survive in cold, nutrient-poor, or metal-contaminated soils. However, its propagation on a large scale is problematic due to the infrequent production of viable seeds, seed dormancy, and the limitations of reproduction by rhizomes. A technique to rapidly and effectively produce large quantities of outplanting stock of this species was sought. Seeds of E. vaginatum were cultured on Murashige and Skoog (MS) medium supplemented with plant growth regulators at different concentrations. The highest regeneration rate was obtained on MS medium supplemented with 2.26 µM 2,4-dichlorophenoxyacetic acid (2,4-D) and 2.32 µM kinetin (KIN) for callus induction, and 17.76 µM BA (6-benzylaminopurine) for shoot regeneration as well as when 2.26 µM 2,4-D and 4.65 µM KIN was added to the callus-induction medium, and 8.88 µM or 17.76 µM BA to the shootregeneration medium. The regenerated shoots were rooted on MS medium without growth regulators and acclimatized in a greenhouse. Genetic stability of the in vitro regenerants was determined using flow cytometry and random amplified polymorphic DNA. Cytometric analysis revealed that the nuclear DNA content was similar in all plant materials and amounted to about 0.8 pg/2C. The PCR amplification products were monomorphic in callusderived plants and similar to plants grown in a field. Lack of genome size variation and polymorphism within the regenerants indicates that the detailed E. vaginatum micropropagation protocol allows the production of a large number of genetically stable plants.