Volume 79, Issue 1, Pages (July 2000)

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Volume 79, Issue 1, Pages 357-369 (July 2000) Analysis of Lung Surfactant Model Systems with Time-of-Flight Secondary Ion Mass Spectrometry Nikolaus Bourdos, Felix Kollmer, Alfred Benninghoven, Michaela Ross, Manfred Sieber, Hans-Joachim Galla Biophysical Journal Volume 79, Issue 1, Pages 357-369 (July 2000) DOI: 10.1016/S0006-3495(00)76297-7 Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 1 Surface pressure-area diagram of a monolayer of DPPC, DPPG, and SP-C on a pure water subphase at pH 5.8 and at 20°C. The molar ratio of DPPC and DPPG is 4:1, the SP-C content is 0.4mol %. The isotherm exhibits an extensive plateau region close to 50 mN/m. Cyclic compression beyond the plateau always develops the same isotherm; the film collapse is fully reversible. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 2 TOF-SIMS spectrum of positive SI from an LB layer of DPPC/DPPG/SP-C, prepared at plateau pressure on gold. PIDD: 3.4×1012cm−2. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 3 TOF-SIMS spectrum (fingerprint range) of positive SI from SP-C, prepared on silver by spin-coating of 1 nmol of SP-C, solved in isopropanol/water. PIDD: 6.8×1011cm−2. Inset: molecular ion peak of SP-C. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 4 Images of DPPC/DPPG monolayers. (A–H) Maps of positive SI at 6 and 30mN/m. PIDD: 1.0×1013cm−2 (6mN/m), 7.0×1012cm−2 (30mN/m); (I) 6mN/m, Ca+; (K) 6mN/m, sum image of several positive SI; (L) 6mN/m, silver-decorated; (I) and (K) are digitally enhanced. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 5 Images of DPPC/SP-C monolayers. Maps of positive SI at 6 and 30mN/m. PIDD: 7.4×1012cm−2 (6mN/m), 4.9×1012cm−2 (30mN/m). Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 6 Images of DPPG/SP-C monolayers. (A–I) Maps of positive SI at 6, 30, and 50mN/m (plateau); (K) Plateau, sum image of several amino acid-specific positive SI; (L) Plateau, Ca+; PIDD: 1.9×1013cm−2 (6mN/m), 8.1×1012cm−2 (30mN/m), 5.9×1013cm−2 (50mN/m). (M) Plateau, scanning force micrograph. Bright areas are higher than the dark (no scale bar given). (N–P) Fluorescence micrographs at 6, 30, and 50mN/m. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 7 Images of layers prepared from the ternary mixture DPPC/DPPG/SP-C. (A–S) Maps of positive SI at 6, 30, and 50mN/m; (G) is digitally enhanced. PIDD 8.1×1012cm−2 (6mN/m), 2.0×1013cm−2 (30mN/m), 4.6×1013cm−2 (50mN/m). Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions

Figure 8 Additional images from the plateau region of DPPC/DPPG/SP-C layers: (A) Sum image of several positive SI; (B) M42 (CNO−); (C) Fluorescence micrograph; (D) Scanning force micrograph. Biophysical Journal 2000 79, 357-369DOI: (10.1016/S0006-3495(00)76297-7) Copyright © 2000 The Biophysical Society Terms and Conditions