Sedova, Marina, Elena N. Dedkova, and Lothar A. Blatter. Integration of rapid cytosolic Ca signals by mitochondria in cat ventricular myocytes. Am J Physiol Cell Physiol 291: C840–C850, 2006. First published May 24, 2006; doi:10.1152/ajpcell.00619.2005.—Decoding of fast cytosolic Ca concentration ([Ca ]i) transients by mitochondria was studied in permeabilized cat ventricular myocytes. Mitochon...

In isolated rat extensor digitorum longus (EDL) muscle mounted for isometric contractions, chronic low-frequency electrical stimulation was found to lead to an increased uptake of45Ca (154% above control after 240 min) and a progressive accumulation of Ca2+ (85% above control after 240 min). In soleus, however, this treatment led to a small, but significant, increase in 45Ca uptake (30% above c...

In the present study, some nutritional imbalances, specific ion toxicity and yield-ion concentration relationships in maize under water, nitrogen (N) and salinity stresses were assessed. Effect of different levels of irrigation water (I1=1.0ETc+0.25ETc as leaching, I2 =0.75I1 and I3 =0.5I1) as main plot, salinity of irrigation water (S1=0.6, S2= 2.0 and S3=4.0 dS m-1) as sub-plot and N fertiliz...

Phosphate accumulation by muscle in vitro and the effects of vitamin D3 metabolites thereupon were studied in cultures of chick embryo skeletal muscle myoblasts and intact chick soleus muscles. A significant proportion of phosphate accumulation by the cells was Na+-dependent, saturable with respect to phosphate, energy-dependent and inhibited by ouabain and arsenate, in agreement with the opera...

Recently, we found that vacuolar proton ATPase (VPATPase) operates in cardiomyocytes as a complementary proton-extruding mechanism. Its activity was increased by preconditioning with resultant attenuation of intracellular acidification during ischemia. In this study, we examined whether VPATPase-mediated proton efflux during metabolic inhibition/recovery may spare Na+ overload via Na+-H+ exchan...

Grassl, Steven M. Urate/ -ketoglutarate exchange in avian basolateral membrane vesicles. Am J Physiol Cell Physiol 283: C1144–C1154, 2002. First published June 13, 2002; 10.1152/ajpcell.00379.2001.—Membrane transport pathways for transcellular secretion of urate across the proximal tubule were investigated in avian kidney. The presence of coupled urate/ -ketoglutarate exchange was investigated ...

To measure the influx of Na+ and other ions through the light-dependent permeability of photoreceptors, we superfused the isolated retina of the toad, Bufo marinus, with a low-Ca2+ (10(-8) M), low-Cl- Ringer's solution containing 0.5 mM ouabain. Under these conditions, the membrane potential of the rod is near zero and there is no light-induced potential change either in the rod or in more prox...

the effects of sodium chloride and zn rates and sources on the growth and chemical composition of lowland rice (oryza sativa l.) were studied using calcareous soil in a greenhouse experiment. the treatments comprised 5 levels of nacl (0, 12.5, 25, 37.5 and 50 mmol kg-1 soil), three zn rates (0, 5 and 10 mg kg-1 soil) and two zn sources (znso4, 2h2o and znedta). applied salinity decreased shoot ...

With a view to test how the branchial and intestinal tissues of fish, the two sites of metal acquisition, utilize the water-borne ferric [Fe(III)] iron and whether the accumulation of this form of iron influences cellular Na/K gradient in these tissues, the gills and intestines of climbing perch adapted to freshwater (FW) and acclimated to dilute seawater (20 ppt; SW) were analyzed for ouabain-...

ABSTRACT- Seed germination and early seedling growth are critical stages for plants establishment and production, particularly under salinity conditions. Exogenous application of silicon (Si) can enhance germination as well as seedling growth. In this experiment, the effect of priming with Si (0, 0.75, 1.5 and 2.25 mM sodium silicate) on seed germination and seedling growth under NaCl (0, 100 a...