When tobacco (Nicotiana tabacum L. var. Virginia Gold) plants were pretreated with Na ((22)Na) several days before detopping, from 2.3 to 4.9% of Na previously accumulated in roots appeared in the xylem exudate in 7 days after detopping. Na from the external medium, however, was readily transported to the exudate. Moreover, the amount of the pretreatment Na that was transported to the exudate w...

The antitumor antibiotic peplomycin showed higher cytostatic antiproliferative effect on five cultured human oral squamous cell carcinoma (OSCC) cell lines (HSC-2, HSC-3, HSC-4, Ca9-22 and NA), as compared with three human oral normal cells (gingival fibroblast HGF, pulp cell HPC and periodontal ligament fibroblast HPLF). Although the antiproliferative activity of peplomycin declined with incre...

In skeletal muscle, excitation may cause loss of K+, increased extracellular K+ ([K+]o), intracellular Na+ ([Na+]i), and depolarization. Since these events interfere with excitability, the processes of excitation can be self-limiting. During work, therefore, the impending loss of excitability has to be counterbalanced by prompt restoration of Na+-K+ gradients. Since this is the major function o...

Yeast plasma membrane Na+/H+ antiporters are divided according to their substrate specificity in two distinct subfamilies. To identify amino acid residues responsible for substrate specificity determination (recognition of K+), the Zygosaccharomyces rouxii Sod2-22 antiporter (non-transporting K+) was mutagenized and a collection of ZrSod2-22 mutants that improved the KCl tolerance of a salt-sen...

abstract in order to study the effects of salinity and silicon application on biomass of leaves and root of purslane (portulaca oleracea l.), a greenhouse experiment was conducted at research greenhouse of ferdowsi university of mashhad using completely randomized desgin with three replications. employed two factors consisted of three levels of salinity using nacl (0.6, 11, 22 ds/m) and two lev...

The assessment of inflammatory markers and ions in exhaled breath condensate (EBC) is being utilized more frequently in diseases such as asthma and cystic fibrosis with marked variability in EBC measures, including those of exhaled Na(+). We sought to determine if variability in exhaled Na(+) was due to differences in pulmonary blood flow (PBF) or Na(+) in the mouth (salivary Na(+)). We measure...

On the basis of phenomenological model of the orthopositronium annihilation 'isotope anomaly' in gaseous neon (lifetime spectra, positrons source 22 Na) the realistic estimation of an additinal mode (∼0.2%) of the orthopositronium annihilation is received.