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1. The relationship between the rate of evoked transmitter release and the extra-cellular concentration of Ca ions, [Ca2+]o, was studied at surface neuromuscular junctions of the frog cutaneous pectoris muscle. The average quantal content of the end-plate potential was reduced to low levels by reducing [Ca2+]o and adding 2 mM-Mn2+, 45 MM-Co2+ or 10 mM-Mg2+.(More)
Changes in dissolved nutrients in the lower Ebro River: Causes and consequences Water quality time series data regarding nutrient concentration and chlorophyll in the lower Ebro River and its estuary were analyzed over an 18 year period (1987-2004). Causes and consequences of changes in nutrient concentration are discussed and some hypotheses about it are(More)
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