Particle dia. Number of cells, mln. NL/AM ratio total Alveolar macrophages (АМ) Neutrophil leucocytes (NL) - 2.53±0.36 2.06±0.29 0.30±0.05 0.15±0.03 10 nm 18.57±3.20*ϒ 2.72±0.54 14.99±2.57*ϒ 6.23±0.62*ϒ 50 nm 26.37±5.12*ϒ 5.05±0.93*●ϒ 20.65±4.37*ϒ 4.42± 0.57*●ϒ 1 μm 4.06±0.44*● 1.81±0.24 1.93±0,28*● 1.32±0.27*● «*» – designates values that are statistically significantly different from control value; «●» – same from the value for «10 nm» group; ϒ - same from «1 μm» (Р<0.05 by Student’s t-test)

Table 1: Count of BALF cells 24 hours after intratracheal instillation of suspensions of magnetite particles (2 mg/ml) of various sizes to rats (X±s.e.).