Ionic Species in Orthophosphate Absorption by Barley Roots.

Phosphorylation by Barley Root Mitochondria & Phosphate Absorption by Barley Roots.

The absorption by roots of ions in general, and phosphate absorption in particular, can occur against concentration gradients so great as to require free energy changes of the order of 8,000 calories per nmole. This implies coupling in the absorption process with reactions Jeroceecling wdith considerable free energy decrease. Few reacticius in plants other than those for production or destructi...

Kinetics of Sulfate Absorption by Barley Roots.

provements in the determination of iron by the Nitroso-R Salt Method. Ind. Eng. Chem., Anal. Ed. 16: 272. 1944. 25. SIDERIS, C. P. and YOUNG, H. Y. Effects of iron on chlorophyllous pigments, ascorbic acid, acidity and carbohydrates of Ananas comosus (L.) Merr. supplied with nitrate or ammonium salts. Plant Physiol. 19: 52-75. 1944. 26. SIDERIS, C. P. and YOUNG, H. Y. Effects of potassium on ch...

Manganese absorption by excised barley roots.

Short-term absorption studies with 5-day-old excised barley roots revealed that the basic aspects of Mn absorption were similar to those of other metabolically absorbed cations. Following an initial non-metabolic equilibration with the root, Mn was absorbed for several hours at a slower steady-state rate comparable to that of other inorganic cations. Complete or nearly complete inhibition of th...

Effects of temperature on orthophosphate absorption by excised corn roots.

The uptake of orthophosphate ((32)P) by excised corn roots, Zea mays L. was studied using roots grown on 0.2 mm CaSO(4). Nine concentrations of KH(2)PO(4) from 1 to 256 mum were used at temperatures of 20 degrees , 30 degrees , and 40 degrees . Enzyme kinetic analysis was applied to the data obtained. Two apparent mechanisms (sites) of phosphate uptake were observed, 1 dominating at high P conc...

Respiration and Salt Absorption by Excised Barley Roots.