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Biomedical subjects

V Georgieva

Publications and source records attributed to V Georgieva.

22 records · Page 2Linked to original sources
PubMed1985

On the genotoxicity of the pesticides Endodan and Kilacar in 6 different test systems.

Two pesticides, the fungicide Endodan (ethylene thiuram monosulphide) and the insecticide-acaricide Kilacar (bis(parachlorophenyl)cyclopropyl methanol), produced or used in the neighbouring countries of Bulgaria and Greece were investigated in a coordinated research programme for their genotoxic effects in a variety of test systems. This included the Ames test, Aspergillus nidulans for mitotic segregation, in vitro human lymphocyte cell cultures for SCE and chromosomal aberrations, in vivo bone marrow cells in hamsters and rats and the dominant lethal test in rats. The genotoxicity of Endodan was found to range from negative to slightly positive in different test systems. At concentrations of 7.5 and 12.0 micrograms/plate together with S9 mix it induced base-pair substitutions in the TA100 strain of Salmonella typhimurium at a rather low level. At a dose of 93 mg/kg b.w. it also caused chromosomal aberrations in acutely treated hamster bone marrow cells. A significant increase of SCE was also found in human lymphocyte cultures at a concentration of 20.0 micrograms/ml. Endodan was found to be negative in A. nidulans for somatic segregation, lymphocyte cultures for chromosomal aberrations and mitotic activity and in rats for dominant lethals and chromosomal aberrations. Kilacar was found to be a weak mutagen in the TA97 strain of S. typhimurium at concentrations of 2.5 and 5.0 micrograms/plate together with S9 mix. At concentrations of 1.0, 1.5 and 2 micrograms/ml Kilacar increased the number of mitotic segregants in A. nidulans by 160%, 220% and 156% respectively over the control. In Syrian hamster bone marrow cells after acute administration at concentrations of 0, 40, 80 and 160 mg/kg, the MI was 5.50, 4.30, 3.10 and 1.30 respectively, and an increase in chromosomal aberrations of about 300% over the control was observed with a concentration of 80 mg/kg. In human lymphocytes no significant changes were observed in either MI or SCE. In the dominant lethal test after chronic treatment of male rats at doses of 5.1, 10.2 and 102.0 mg/kg b.w. no significant mutagenic effect was found although a decrease was shown in the percentage of females with implants mated with treated males in the first week.

Animals↗
PubMed1982

[Manifestations, treatment and prognosis in acute leukemia].

One hundred fifty one patients were studied--with acute lymphoblast leukosis (ALL) and acute non-lymphoblast (myelogenic) leukosis (ANLL). The disease had a fulminant course in 118 of the patients studied (21.8%). In 73 patients, out of 118 studied, no treatment effect was obtained (61.9%) and the rest 45 patients developed a complete remission (38.1%). In 10 of the patients with no treatment effect, a partial remission was obtained (8.4%). The remission is more frequent in case of ALL. The younger age, at present, remains the most essential prognostic factor. Partial initial leukose infiltration of the bone marrow was found in some of the patients. The bone marrow aplasia is not an obligatory phase of remission. The latter could develop by a gradual restoration of the normal hematopoiesis. The existence of stages with inducing of leukosis processes is possible that follow the reverse way in remission development. Hemorrhages are the most frequent complications in forms with fulminant course, and the infections--in the rest of the patients.

Adolescent↗