Stj?rne: The present review puts the emphasis on two important developments: the discovery that individual postganglionic sympathetic neurons may secrete multiple transmitter substances from different classes of vesicles and by different mechanisms, and the introduction of new techniques which may permit for the first time direct impulse by impulse analysis of transmitter secretion in individual sympathetic nerve varicosities. Illes: Exogenous and endogen opioid peptides elicit a number of effects in the organism, usually by modifying the function of transmitter and hormone systems, for example, activation of multiple opioid receptors. The effects of opioids on transmitter and hormone release have frequently been reviewed. This review gives a detailed overview on the involvement of multiple opioid receptors in these processes. Rothstein: This article gives an overview of the exchange in acidification and transepithelial salt and water transfer in nonepithelial cells. Delineating the exchanger's most important, common features, and concentrating particularly on its role in cell pH and volume regulation.