The stomatal complex of Zea mays is composed of two pore-forming guard cells and two adjacent subsidiary cells. For stomatal movement, potassium ions and anions are thought to shuttle between these two cell types. As potential cation transport pathways, K(+)-selective channels have already been identified and characterized in subsidiary cells and guard cells. However, so far the nature and regu...

The effects of anion-channel blockers on light-mediated stomatal opening, on the potassium dependence of stomatal opening, on stomatal responses to abscisic acid (ABA), and on current through slow anion channels in the plasma membrane of guard cells were investigated. The anion-channel blockers anthracene-9-carboxylic acid (9-AC) and niflumic acid blocked current through slow anion channels of ...

iii ACKNOWLEDGEMENTS I would like to thank Cem Ersoy for his guidance throughout my PhD study, M. Ufuk Ça˘ glayan for being the model of an academician, Hakan Deliç for his comments on DS-CDMA systems, Abbas Yongaço ˘ glu for his short course on CDMA systems, Emre Çelebi for his valuable discussions and support in Linux, and Ian Anderson for the high spirits. I would also like to thank my wife ...

Previous studies have demonstrated that methyl jasmonate (MeJA) induces stomatal closure dependent on change of cytosolic free calcium concentration in guard cells. However, these molecular mechanisms of intracellular Ca(2+) signal perception remain unknown. Calcium-dependent protein kinases (CDPKs) function as Ca(2+) signal transducers in various plant physiological processes. It has been repo...

Absrract-This work IS a continuation of our earlier work on the Generalized Guard-zones Algorithm (GGA) for self-supervised parameter learning. An atlempt is made here for the automatic determination of the guard-zone parameter i' N (i.e. the threshold used for discarding doubtful or mislabeled samples) at every instant of learning, for the general m-elass N-featu re pattern recognition problem...

Dynamic regulation of stomatal aperture is essential for plants to optimize water use and CO2 uptake. Stomatal opening or closure is accompanied by the modulation of guard cell turgor. Among the events leading to stomatal closure by plant hormones or microbial elicitors, three signaling components stand out as the major converging points. These are reactive oxygen species (ROS), cytosolic free ...

We propose an admission control policy for wireless multimedia networks that is based on the well known threshold-based guard channel method. The new scheme deals with two different types of traffic classes; namely: voice and data. We assume two different thresholds, one for each traffic class. In addition, we propose to buffer the handoff data calls if no free channels are available rather tha...

In this paper, a dynamic version of the Guard Channel Scheme (GCS) for cellular networks is illustrated to show the relation between bandwidth threshold and system mobility. The bandwidth threshold is dynamically changed according to mobility values. We propose a new equation which shows the relation between bandwidth threshold (Bt) and mobility. The effect of mobility on Bt is investigated usi...

The activity of the two dominant K(+) channels in the plasma membrane of Vicia faba guard cell protoplasts was examined during pressure-driven swelling. For this purpose, the K(+) currents and the membrane capacitance (C(m)) of guard cell protoplasts were recorded in parallel. A rise in C(m), reflecting an increase of the membrane surface area, was coupled to a proportional rise in conductance ...