Atomic force microscopy (AFM), a unique tool to investigate drug treatment of cancer cells, was used to analyze the anti-neoplastic activity of adriamycin by comparing DNA structures of non-treated and adriamycin-treated Ehrlich tumor cells. The non-treated cells exhibited a highly branched intact chromatin structure, related to the intensive DNA replication in cancer cells. Images from adriamycin-treated tumor cells showed that the DNAchains were broken and the chromatin structure had been destroyed. Possible explana- tions for these effects of adriamycin are considered: breakage of hydrogen bonding, oxida- tion and intercalation effects, as well as the poisoning of topoisomerase enzyme. DNA fractal and multifractal analyses, performed in order to evaluate the degree of bond scission, showed that the treated DNA had become more fractal compared to non-treated DNA.

PURPOSE To study in vitro the antioxidative effect of 6 Satureja montana L. extracts on free radicals and their antiproliferative effect on human tumor cell lines. MATERIALS AND METHODS The antioxidative effect of extracts on 2, 2-diphenyl-1-picryhydrazyl (DPPH) radical was investigated by electron spin resonance (ESR) spectroscopy. Cell growth effect was measured by sulforhodamine B colorimetric assay on HeLa (human cervix epidermoid carcinoma), HT-29 (human colon adenocarcinoma), and MCF-7 (human breast adenocarcinoma) cell lines. IC(50) values were calculated from the concentration response curves following 48 h exposure time. RESULTS The antioxidative activity of extracts increased dose-dependently at mass concentrations ranging from 0.05 to 0.3 mg/ml, and decreased in the following order: n-butanol > methanol > water > ethyl acetate > petroleum ether. All extracts effected cell growth but in a different way, depending on the extract dose and cell line. Extracts exhibited antiproliferative effect on HeLa cell line with IC(50) values ranging from 0.41 to 0.84 mg/ml except petroleum ether (IC(50) >1 mg/ml). Petroleum ether and chloroform extracts stimulated proliferation of HeLa cells within a concentration range from 0.0625 to 0.125 mg/ml. No extract reduced MCF-7 cells growth by 50% even at the concentration of 1 mg/ml. Only petroleum ether and chloroform extracts induced significant growth inhibition of HT-29 cells (IC(50) was approximately 0.74 mg/ml for both extracts). Strong stimulation of HT-29 proliferation was observed within a concentration range from 0.0625 to 0.25 mg/ml for petroleum ether, n-butanol and chloroform extract, and from 0.0625 to 0.5 mg/ml for methanol and water extracts, respectively. CONCLUSION The obtained results indicated that Satureja montana L. extracts are strong antioxidants in vitro. ESR data demonstrated that n-butanol, methanol and water Satureja montana L. extracts possess high antioxidative activity. Chloroform extract did not show any antioxidative activity. Satureja montana L. extracts selectively inhibited the growth of human tumor cells.

SUMMARY. Objective. The aim of this study is to appreciate the mode of delivery in the pregnant women with placenta praevia. Methods. Retrospective study. We analized 9010 deliveries (two years period, 2001 and 2002) performed at the University Clinical Center, Tuzla, Ob/Gyn Clinic. Control group were 16 pregnant women without placenta praevia. In statistical analysis t-test was used. Results. The incidence of placenta praevia was 0.17% (16 out of 9010 deliveries). Placenta praevia partialis was established in 8 (50%), placenta praevia centralis in 4 (25%) and placenta praevia marginalis in 4 (25%) pregnant women. All pregnant women with placenta praevia were secundiparas and multiparas. The caesarean section was previously performed in 8 (50%) pregnant women. In actual pregnancy in 14 (87.5%) of pregnant women with placenta praevia the mode of delivery was by caesarean section, in the control group in 3 (18.75%), the t-test is 5.72, p<0.05. Apgar score 8–10 was in 12 and 4–7 in 4 (25%) neonates; in the control group Apgar score 4–7 was only in one case (6.25%); the statistical difference is not significant. The gestational age at delivery in 8 cases was ≤37 weeks, in the control grup in 2; the difference is statistically significant (t=2.51, p<0.05). Conclusion. Placenta praevia is a serious complication of pregnancy. The method of choise in the delivery for pregnant women with placenta praevia is caesarean section.