Essential requirements for the maintenance of active uptake of sodium chloride in isolated frog skin in Ringer's solution are: sufficient oxygen supply (8); neutral or slightly alkaline reaction of Ringer's solution (10); a reasonable temperature, e.g. 25°C., of the environment (10). A few years ago it was found (11) that, in addition to the above mentioned factors, the K + level in Ringer's so...

Exogenous administration of arachidonic acid, prostaglandins PGF2 alpha, PGD2 and PGE2 increased potassium-stimulated uptake of calcium in rat brain synaptosomes from the brain of the rat, but had no effect on the basal uptake of calcium. Arachidonic acid-induced uptake of calcium was mediated by its prostaglandin metabolites, because a cyclooxygenase inhibitor, indomethacin, inhibited the resp...

Very few vacuolar two pore potassium channels (TPKs) have been functionally characterized. In this paper we have used complementation of K(+) uptake deficient Escherichia coli mutant LB2003 to analyze the functional properties of Arabidopsis thaliana TPK family members. The four isoforms of AtTPKs were cloned and expressed in LB2003 E. coli background.The expression of channels in bacteria was ...

Received for Publication October 28, 1985 INTRODUCTION Fertilization of sugarbeets (Beta vulgaris L.) with potassium (K) is generally not recommended in the intermountain areas of the western United States. This is attributable to the general abundance of available K and sodium (Na) in the soils of this region, irrigation water often containing significant K and Na concentrations (7), and the l...

It has been reported that benziazole compounds, of which benzimid'azole is one, are growth regulators (4). The responses of this group of compounds appear to vary somewhat from some of the other growth regullators and bhths according to Klingen)smilth the benzazoles sihoul,d be classified as a slelparate dl'ass of compounds. One of the effects of benzimidazoile is an added uptake o-f potassium ...

Procaine, cocaine, pyribenzamine, antistine, and phosphate decrease the uptake of water by frog sartorii in a Ringer solution in which potassium has been substituted for sodium; all but the last two leave the swelling in hypotonic Ringer practically unaltered. They also decrease the depolarizing action of potassium. These effects are considered indicative of reduced membrane permeability to pot...

Potassium (K+) is one of the most important macronutrients for plant growth and development. It generally accepted that KUP/HAK/KT transporters play essential roles in K+ uptake at low concentrations. However, their physiological functions bananas remain unknown. Here, we cloned MaHAK5 analyzed its banana (Musa acuminata). Gene expression analysis showed was upregulated roots leaves early stage...

crop residues management is one of the most important factors to sustain agro-ecosystems. application of plant residues as organic fertilizers has functional role on the amount of soil elements, their availability for crops and finally yield obtained. in order to investigate the effect of different crop residues and their management on providing wheat potassium requirement, a four-replicated fi...