Classical and column flotation of black coal samples

Celem opracowania jest porównanie wyników klasycznej flotacji węgla z flotacją kolumnową. Badania przeprowadzono na próbkach węgla kamiennego z wybranych kopalń OKD (Ostrawsko-Karwinskie Duly w Czechach - kopalnie Dukla, Darkov, CSM, CSA, Doubrava) i Polski - KWK Kleofas. Uzyskane wyniki pozwalają na stwierdzenie, że zarówno w wyniku flotacji klasycznej jak i kolumnowej można uzyskać koncentraty węgla koksującego o założonej jakości.The objective of the paper was a comparison of classical and column flotation on samples of black-coal slurries from selected localities of OKR and Poland. Namely they are: Dukla Mine, Darkov Mine, CSM Mine, CSA Mine, Doubrava Mine and Kleofas Mine. The acquired results imply that the methods of classical and column flotation are suitable for flotation of the slurries in question as all the tested black-coal slurries from OKR and Poland are cokeable coals with a high flotability

DNA Damage Caused by Ionizing Radiation in Embryonic Diploid Fibroblasts WI-38 Induces Both Apoptosis and Senescence

Cellular response to ionizing radiation-induced damage depends on the cell type and the ability to repair DNA damage. Some types of cells undergo apoptosis, whereas others induce a permanent cell cycle arrest and do not proliferate. Our study demonstrates two types of response of embryonic diploid fibroblasts WI-38 to ionizing radiation. In the WI-38 cells p53 is activated, protein p21 increases, but the cells are arrested in G2 phase of cell cycle. Some of the cells die by apoptosis, but in remaining viable cells p16 increases, senescence associated DNA-damage foci occur, and senescence-associated beta-galactosidase activity increases, which indicate stress-induced premature senescence.</jats:p