The chemical composition of carrot umbel oils obtained by hydrodistillation of three cultivars of Daucus carota L. ssp. sativus was investigated by GC and GC-MS. Forty components were identified. The oils were dominated by monoterpene hydrocarbons (66-85%) represented mainly by α α α α α-pinene (40-46%) and myrcene (12 -24%). The most abundant sesquiterpene constituents were β β β β β -caryrophyllene (4.6-13.2%) and carotol (1.2-6.1%).
This paper gives the results of studies on the effects of malathion on human lymphocytes stimulated by PHA, including cell survival, chromosomal aberration and nucleic acid content. Increasing malathion doses (10-70 micrograms/ml) were introduced into cultures of human lymphotyes at different times relative to the time of PHA addition. At a concentration of 10 micrograms/ml, malathion induced an increase in the RNA and DNA fractions in lymphocyte cultures. Higher malathion concentrations (50 and 70 micrograms/ml), especially the dose of 70 micrograms/ml, induced both a significant decrease in the content of RNA and DNA and reduced survival of cultured cells. The insecticide damaged the chromosome structure, but no correlation was revealed between the dose and the level of chromosome aberrations.
Abstract. Paper presents results of the research findings on the quality problems analysis conducted in the chosen enterprise producing a machinery for the construction industry. The aim of the study was to identify the causes and consequences of the quality problems in the production by using selected methods and tools of the quality management, as well as to identify opportunities to minimize the existing risks in the production process. The results show that approximately 77% of production losses are caused by incompatibilities resulting from two quality problems caused by employee errors and the low quality level of supplied screw taps. The results of the study indicate the corrective measures that may be taken in the company in order to eliminate and reduce identified production problems contributing to the production of machines that do not meet building standards.
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