Background: Zinc has important effects on human health, especially on structural and functional activities of the immune system. This study was carried out to examine the in vitro cytotoxic effects of zinc on Raji cell line. Materials and Methods: The cell line was exposed to different concentrations of zinc followed by incubation (37°C, 5% CO2) at various time points (12 to 72 hrs).Viabil...

Background: Zinc has significant effects on structural and functional activities of many proteins and enzymes involved in biological activities, especially the regulation of immune-system. Symptoms of zinc toxicity include nausea/vomiting, fever, cough, diarrhea, fatigue, neuropathy, and dehydration. Further signs include growth retardation, altered iron function, anemia, copper deficiency, ...

in this study, a generalization of the theory of involute-evolute curves is presented for ruledsurfaces based on line geometry. using lines instead of points, two ruled surfaces which are offset in the senseof involute-evolute are defined. moreover, the found results are clarified using computer-aided examples

Abstract In the present paper, we study conic-line arrangements having nodes, tacnodes, and ordinary triple points as singularities. We provide combinatorial constraints on such arrangements, give complete classification of free in this class.