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1. The transient current required to impose a step charge of potential has a complex time course especially in the region of internal potential between -50 and -40 mV. 2. Examination of non-linear transient current in this voltage range suggests two components of charge movement: (a) an initial more-or-less exponential movement, and (b) a slower component(More)
While there is a general sense that lakes can act as sentinels of climate change, their efficacy has not been thoroughly analyzed. We identified the key response variables within a lake that act as indicators of the effects of climate change on both the lake and the catchment. These variables reflect a wide range of physical, chemical, and biological(More)
1. Membrane capacity of sartorius muscle fibres has been measured at membrane potentials between -200 and +50 mV. Within this potential range the capacity is not independent of potential. Dielectric saturation is present at large negative and at positive internal potentials, indicating the presence in the membrane of permanent dipoles or movable charges. 2.(More)
1. A method is described which allows the approximate computation of membrane current from measurements with three electrodes in the mid-region of a muscle fibre.2. Measurements of inward sodium current in frog muscle are compared with the results of previous clamping studies to test the validity of the new method.3. Sodium current in rat muscle (extensor(More)
1. Muscle fibres from goats with myotonia congenita show characteristic responses to stimulation with intracellular currents (Adrian & Bryant, 1974). To test whether the reduced surface chloride conductance can account for these myotonic discharges, we have calculated responses of a model 'muscle fibre' to intracellular current of long duration (greater(More)
We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous high-frequency measurements of(More)
Key Points: • Lake surface waters are warming rapidly but are spatially heterogeneous • Ice-covered lakes are typically warming at rates greater than air temperatures • Both geomorphic and climate factors influence lake warming rates Supporting Information: • Figures S1–S4 and Tables S1–S4 Citation: O'Reilly, C. M., et al. (2015), Rapid and highly variable(More)
Past heat waves are considered harbingers of future climate change. In this study, we have evaluated the effects of two recent Central European summer heat waves (2003 and 2006) on cyanobacterial blooms in a eutrophic, shallow lake. While a bloom of cyanobacteria developed in 2006, consistent with our expectations, cyanobacterial biomass surprisingly(More)