Svetoslav Todorov

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The sputtering rate for silicon dioxide by argon ion bombardment at energies appropriate for ion beam deposition (< 100 eV) has been measured. It has been found that the energy dependence of the oxide sputtering rate at these low energies is easily predicted by assuming the yield is limited by the metallic component of the binary target. This assumption is(More)
Dielectric films with thickness of the order of 50 A are obtained at room temperature by bombarding exposed silicon surfaces with an oxygen-containing ion beam of energy 60 eV. Silicon nitride thin films have also been formed using the same technique. The film thickness is self-limited and largely independent of ion dose. AES and XPS analysis of the(More)
Tested was the embryotoxic and teratogenic action of the organic mercury compounds (phenyl mercuric acetate), containing 2 per cent mercury, on albino rats. The preparation was introduced orally during pregnancy in the form of a 2 per cent water solution at the following rates: I group--1/8 LD50 (= 4 mg Hg/kg body mass) on the 4th and 5th day of pregnancy;(More)
The pattern of morphological changes in blood clots, brain tissue and vessels of hypertensive hematomas (CH) was studied in 79 surgical and autopsy cases. Brain tissue compression degeneration of cells and fibers, edema were observed during the first 6 hours after the onset of hemorrhage. Necrosis and marked leukocyte infiltration appeared to progress(More)
A total of 554 case and autopsy records were clinically and morphologically analyzed. There was aortic coarctation (AC) in 47 cases, including 32 cases in babies aged less than 1 month. Pathomorphologic changes in the aorta and pulmonary artery in AC are a dynamic process and reflect the signs of increased vascular permeability, damaged muscle elements, and(More)
The paper considers the current aspects of the morphology, immunohistochemistry, molecular biology of liposarcomas. Particular attention is given to the embryogenesis of liposarcomas and to problems in the immunohistochemical diagnosis of these neoplasms. There is evidence that TLS-CHOP is involved in the PNA processing of liposarcoma cells. Prospects for(More)
Tested was the embryotoxic and teratogenic action of the organomercurial preparation falizan (a phenyl-mercury acetate), containing 2 per cent mercury, in chick embryos. It was introduced into the viteline sac of 3-day-old embryos in the form of a water solution as follows: Group I--0.1 cm3 per egg of a 13 per cent solution of falizan (= 260 micrograms Hg);(More)