0.05). Açık hücre kültürlerinde çalışmaya alınan 68 olguda çalışmaya başlayıncaya kadar geçen süre ortalama 14,00±4,55 gün, kapalı sistemde ise toplam 100 olguda 13,19±3,60 gün olarak bulundu. Besiyeri değişim sayısı açık sistemde toplam 68 olguda ortalama flask başına 2,33±1,33; kapalı sistemde ise toplam 100 olguda ortalama tüp başına 1,29±0,46'dı. Total of 100 amniotic fluid samples were cultured both in open and closed systems to compare the growth of cell cultures by using different mediums. Each flask and tube was assessed in respect to cost effect, harvesting time and mitotic index. The 25-cm<sup>2</sup> plastic tissue culture flask and BioAmf I medium with penicilline-streptomycin and L-Glutamine for open system and 10 ml flat bottom tubes and F-10 Ham's Nutrient Mixture/Chang-D mediums supplied Hepes buffer, Ultroser-G, fetal calf serum, penicilline-streptomycin and L-Glutamine for closed system were used. Cell growth was obtained in all samples cultured by using closed system. In one closed culture tube, the number and quality of metaphases were not sufficient. Twenty-eight out of 100 amniotic fluid samples in open system were excluded from the study. Four out of 68 amniotic fluid samples were infected. Each flask for open system cell culture costed 4 times more expensive than each tube for closed system cell culture. The mean mitotic index was 10.46±12.76 in open and 9.76±9.75 in closed system(p>0.05). The mean time for harvesting in 68 cases was 74,00±4,55 days for open and 13,79±3,60 days in 100 cases for closed system. The mean number of medium change was 2,33±1,33 per flask for open system and 7,2±0,46 per tube for closed system.">
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