CONTENTS OF VOLUME 83 No. 1, January 1991 S.K. Powers, J. Lawler, D. Criswell, S. Dodd and H. Silverman (U.S.A.): Age-related changes in enzyme activity in the rat diaphragm C.C. W. Hsia, J.I . Carlin, M. Ramanathan, S.S. Cassidy and R. L. Johnson, Jr. (U.S.A.): Estimation of diffusion limitation after pneumonectomy from carbon monoxide diffusing capacity H. Kobayashi, B. Pelster, J. Piiper and P. Scheid (F.R.G.): Diffusion and perfusion limitation in alveolar O, exchange: shape of the blood O, equilibrium curve Y.-L. Lai (U.S.A.): Role of the axon reflex in capsaicin-induced bronchoconstriction in guinea pigs R.A. Furilla, E.L. Coates and D. Bartlett, Jr. (U.S.A.): The influence of venous CO, on ventilation in garter snakes Y.R. Kou and L.-Y. Lee (U.S.A.): Mechanisms of cigarette smoke-induced stimulation of rapidly adapting receptors in canine lungs T. Chonan, W. Hida, S. Okabe, T. Izumiyama, M. Sakurai and T. Takishima (Japan): Effects of focal cooling of the ventral medullary surface on breathing pattern and blood pressure in dogs M.A. Douse and G.S. Mitchell (U.S.A.): Time course of temperature effects on arterial acid—base status in Alligator mississippiensis J.-C. Massabuau, B. Burtin and M. Wheathly: How is O, consumption maintained independent of ambient oxygen in mussel Anodonta cygnea? 103 M. F. Khatib, Y. Oku and E. N. Bruce (U.S.A.): Contribution of chemical feedback loops to breath-to- breath variability of tidal volume 115 P.G. Wagner and F.L. Eldridge (U.S.A.): Development of short-term potentiation of respiration 129 Guest Referees 1990 141 Announcement from the Publisher 142 No. 2, February 1991 G. Manier, J. Moinard, P. Téchoueyres, N. Varéne and H. Guénard (France): Pulmonary diffusion limitation after prolonged strenuous exercise 143 J.M.B. Hughes, D.N.A. Lockwood, H.A. Jones and R.J. Clark (U.K.): Dico/Q and diffusion limitation at rest and on exercise in patients with interstitial fibrosis 155 S.C. Hempleman and J.M.B. Hughes (U.S.A., U.K.): Estimating exercise DLo, and diffusion limitation in patients with interstitial fibrosis 167 Y. Cormier, M. Laviolette, L. Atton and F. Sériés (Canada): Influence of lung volume on collateral resistance in normal man 179 R. C. Basner, J. Ringler, R.M. Schwartzstein, S.E. Weinberger and J. Woodrow Weiss (U.S.A.): Phasic electromyographic activity of the genioglossus increases in normals during slow-wave sleep 189 A. Denjean, E. Canet, J. P. Praud, Cl. Gaultier and M. Bureau (Canada): Hypoxia-induced bronchial responsiveness in awake sheep: role of carotid chemoreceptors 201 M. Pokorski and S. Lahiri (U.S.A.): Endogenous opiates and ventilatory acclimatization to chronic hypoxia in the cat 211 N.J. Smatresk andA . W. Smits (U.S.A.): Effects of central and peripheral chemoreceptor stimulation on ventilation in the marine toad, Bufo marinus 223 395 396 CONTENTS OF VOLUME 83 J.S. Wasser, S.J. Warburton and D.C. Jackson (U.S.A.): Extracellular and intracellular acid—base effects of submergence anoxia and nitrogen breathing in turtles 239 Erratum 253 No. 3, March 1991 Announcement from the Publisher ili H. Kobayashi, J. Piiper and P. Scheid (F.R.G.): Effect of the curvature of the O, equilibrium curve on alveolar O, uptake: theory 255 M.E. Tsu, A.L. Babb, E.M. Sugiyama and M.P. Hlastala (U.S.A.): Dynamics of soluble gas exchange in the airways: II. Effects of breathing conditions 261 D.P.J. Six, W.R. de Vries and S.C. M. Luijendijk (The Netherlands): Sloping alveolar plateaus of He and SF, measured in excised cat lungs ventilated at constant volume by pressure changes 277 A. Ar, H. Girard and J. L. Rodeau (France): Oxygen uptake and chorioallantoic blood flow changes during acute hypoxia and hyperoxia in the 16 day chicken embryo 295 Y. Kakuta, H. Sasaki and T. Takishima (Japan): Effect of artificial surfactant on ciliary beat frequency in guinea pig trachea 313 S.D. Parker, R.H. Brown and C.A. Hirshman (U.S.A.): Differential effect of glucocorticoids on pulmonary responses and eosinophils 323 L.G. Olson, L.G. Ulmer and N. A. Saunders (Australia): Mechanical properties of the rabbit upper airway during hypoxia and hypercapnia 333 M. Ahmed, G. G. Giesbrecht, C. Serrette, D. Georgopoulos and N. R. Anthonisen (Canada): Ventilatory response to hypoxia in elderly humans 343 Y.R. Kou, P. Ernsberger, P.A. Cragg, N.S. Cherniack and N.R. Prabhakar (U.S.A.): Role of &-adrenergic receptors in the carotid body response to isocapnic hypoxia 353 G.F. Birchard and S.M. Tenney (U.S.A.): Relationship between blood-oxygen affinity and blood volume 365 J. Wittmann and J. Prechtl (F.R.G.): Respiratory function of catecholamines during the late period of avian development 375 Author Index 387 Subject Index