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Full-Text Articles in Biology
Direct Evidence Of Missing Mepsps Using Ca2-Sensor Imaging, Petar Gajic
Direct Evidence Of Missing Mepsps Using Ca2-Sensor Imaging, Petar Gajic
Biological Sciences
Following an action potential in the presynaptic neuron there is evoked release of neurotransmitter into the synapse which activates ionotropic transmembrane receptors on the postsynaptic membrane that cause depolarizations in voltage that get recorded as excitatory postsynaptic potentials (EPSPs). In the absence of an action potential there is spontaneous release of neurotransmitter that postsynaptically gets recorded as miniature excitatory postsynaptic potentials (mEPSPs). According to the quantal hypothesis, postulated by Bernard Katz, the mEPSPs are allor- none changes in potential caused by a single quantum of neurotransmitter, which when added up create EPSPs. Following studies have found that these two modes …
Small Heat Shock Protein Responses Of A Closely Related Pair Of Desert And Coastal Encelia, Charles A. Knight, David D. Ackerly
Small Heat Shock Protein Responses Of A Closely Related Pair Of Desert And Coastal Encelia, Charles A. Knight, David D. Ackerly
Biological Sciences
Evolutionary variation for accumulation of small heat shock protein (sHsp) may contribute to thermal niche differentiation between species. Here we examine temperature and time-course-dependent variation for sHsp accumulation in a recently diverged pair of Encelia raised in a common environment: Encelia farinosa, common in the Mojave desert, and Encelia californica, which is found along the cool coastal bluffs of southern North America. Both species exhibit peak sHsp accumulation at 42oC. Encelia californica accumulated greater levels of sHsp at temperatures below 42oC, while E. farinosa had greater levels above 42oC. Encelia farinosa accumulates …
An Ecological And Evolutionary Analysis Of Photosynthetic Thermotolerance Using The Temperature-Dependent Increase In Fluorescence, Charles A. Knight, David D. Ackerly
An Ecological And Evolutionary Analysis Of Photosynthetic Thermotolerance Using The Temperature-Dependent Increase In Fluorescence, Charles A. Knight, David D. Ackerly
Biological Sciences
The hypothesis that species inhabiting warmer regions have greater photosynthetic tolerance of high temperatures was tested using the temperature-dependent increase in fluorescence (T-Fo). Congeneric species pairs of Atriplex, Salvia, Encelia, and Eriogonum with desert versus coastal distributions were studied in a common environment and in the field. In addition, 21 species with contrasting microclimate distributions were studied at a field site in a northern California chaparral community. The average July maximum temperature within the current distributions of species was quantified using a geographic information system. Four parameters (Tcrit, TS20, …