Perbandingan antara metode kultur dan pewarnaan gram untuk deteksi kontaminasi Bakteri pada konsentrat Trombosit di unit transfusi darah daerah Palang Merah Indonesia DKI Jakarta periode September 2012 = Comparison between culture method with gram staining to detect Bacterial contamination in Platelet concentrate at Jakarta Blood Centre in September 2012 / Dewi Astuti