When Brassica nigra leaf petiole suspension cells were subjected to 7 days of inorganic phosphate (Pi) starvation the extractable activity of: (a) pyrophosphate:fructose 6-phosphate 1-phosphotransferase, nonphosphorylating NADP-glyceraldehyde 3-phosphate dehydrogenase, phosphoenolpyruvate phosphatase, and phosphoenolpyruvate carboxylase increased at least fivefold, (b) phosphorylating NAD-glyce...

Sucrose phosphate synthase was partially purified from spinach leaves and the effects and interactions among glucose-6-P, inorganic phosphate (Pi), and pH were investigated. Glucose-6-P activated sucrose phosphate synthase and the concentration required for 50% of maximal activation increased as the concentration of fructose-6-P was decreased. Inorganic phosphate inhibited sucrose phosphate syn...

It was concluded in a previous paper (1) that the enhancement of respiration by inorganic orthophosphate, occurring in rat liver mitochondria oxidizing a number of Krebs cycle metabolites or glutamate in the presence of 2,4-dinitrophenol or Dicumarol, is due to the substrate level phosphorylation linked to the oxidation of a-ketoglutarate which is not uncoupled by these agents. Yet, no requirem...

Radioactive adenosine triphosphate was synthesized transiently from adenosine diphosphate and radioactive inorganic phosphate by sodium and potassium adenosine triphosphatase from guinea pig kidney. In a first step, K+-sensitive phosphoenzyme was formed from radioactive inorganic phosphate in the presence of magnesium ion and 16 mM sodium ion. In a second step the addition to the phosphoenzyme ...

abstract the objectives of this research was to evaluate the rhizospheric effects of wheat (triticum aestivum l.) on the status of various inorganic p fractions and total organic p in 10 calcareous soils amended with 1% (w/w) municipal sewage sludge from the refinery of shahrekord city under rhizobox conditions. thus, wheat plant was planted in completely randomized design with three replicatio...

It was concluded in a previous paper (1) that the enhancement of respiration by inorganic orthophosphate, occurring in rat liver mitochondria oxidizing a number of Krebs cycle metabolites or glutamate in the presence of 2,4-dinitrophenol or Dicumarol, is due to the substrate level phosphorylation linked to the oxidation of a-ketoglutarate which is not uncoupled by these agents. Yet, no requirem...

IN the preceding paper [Robison and Soames, 1930] it was shown that, although bone slices from rachitic animals will calcify in solutions of inorganic salts supersaturated with respect to the bone phosphate, at lower concentrations of calcium and inorganic phosphate calcification will only occur in presence of phosphoric ester. At critical concentrations of the inorganic radical as little as 0*...