Phosphorus, depletion

X. L. Li. E. George, and H. Marschner, Extension of the phosphorus depletion zone in VA-mycorrhizal white clover in calcareous. soil. Plant and Soil I3I 4 (1991). X. L. Li, E. George, and H. Marschner, Acquisition of phosphorus and copper by VA-mycorrhizal hyphac and root-to-shoot transport in white clover. Plant and Soil 135 49 (1991). 

Figure 11 Root systems as simulated by the computer program Simroot. The systems display herriitgbone architecture (a) dichotomous architecture (b) and bean root architecture (c). The bean root system (c) is shown in

The physician is concerned with at least three factors when prescribing antacids (1) Acid rebound (associated with calcium carbonate) (2) milk-alkali syndrome (caused by ingestion of large quantities of alkali) and (3) phosphorus depletion (by aluminum salts). The mechanism of add rebound, especially in the long-term use of caldum carbonate, is poorly understood. It has been established that there is an excessive re-addification of the antrum (pylonc gland area) a number of hours after ingestion of calcium caibonate. 

Hoppema, J.M.J., and Goeyens, L. (1999) Redfield behavior of carbon, nitrogen, and phosphorus depletions in Antarctic surface waters. Limnol. Oceanogr. 44, 220-224. 

Li, X. L., George, E. Marschner, H. (1991). Phosphorus depletion and pH decrease at the root soil and hyphae soil interfaces of VA mycorrhizal white clover fertilized with ammonium. New Phytologist, 119, 397 04. 

Phosphorus is essential in respiratory disease for its role in the synthesis of adenosine triphosphate, inadequate stores of which can lead to respiratory muscle weakness. Critically ill, malnourished patients are at risk for phosphorus depletion. 

K. Garde, K. Gustavson (1999). The impact of UV-B radiation on alkaline phosphatase activity in phosphorus-depleted marine ecosystems. J. Exp. Mar. Biol. Ecol, 238,93-105. 

L19. Lotz, M., Ney, B., Bartter, F. C., and Smith, H., Osteomalacia and debility resulting from phosphorus depletion. Trans. Assoc. Am. Physicians 77, 281-295 (1964). 

The productivity of many ecosystems is determined by the chemical stability of phosphate, its relative immobility in soil, and its low concentration in the soil solution (approximately 1 xM). Phosphorus uptake by plant roots occurs mainly as phosphate ions (H2P0 and HPO ) from the soil solution, which depends on the solubilization of mineral phosphates and the degradation or mineralization of organic phosphorus. During phosphate uptake, a phosphorus-depleted area is formed close to the root, since phosphate uptake is faster than its diffusion in soil (Bhat and Nye, 1973). Having... 

Zoysa, A.K.N., Eoganathan, P. and Medley, M.J. (1997) A technique for studying rhizosphere processes in tree crops soil phosphorus depletion around camellia (Camellia japonica L.) roots. Plant and Soil 190, 253-265. 

Joner, E.J., Magid, J., Cahoonia, T.S. and Jakobsen, I. (1995) Phosphorus depletion and activity of phosphatases in the rhizosphere of mycorrhizal and non-mycorrhizal cucumber (Cucumis sativus L.). Soil Biology and Biochemistry 27,... 

Phosphorus depletion due to prolonged and excessive intake of nonabsorbable antacids—The frequency of this syndrome is unknown. It is characterized by weakness, anorexia (reduced appetite), and pain in the bones. Treatment consists in discontinuing antacids and providing adequate dietary phosphorus. 

Decrease of the normal phosphorus concentration in the plasma of children on longterm total parenteral nutrition may cause severe neurological complications, such as hypotonia, areflexia, lethargy, tremor of the extremities and polypnoea. The conditions favouring phosphorus depletion appear to be related not only to the absolute amount of phosphorus perfused per kilogram of body weight per day, but also to the amounts of calcium and/or nitrogen associated with the dose of phosphorus in the perfusion solution. 

Calciuria exceeding 10 mg/kg/day and phosphaturia at undetectable level should be a warning sign of phosphorus depletion state (44). 

Ricour, C., Millot, M. and Balsan, S. (1975) Phosphorus depletion in children on long-term total parenteral nutrition. Acta paediat. scand., 64,385. 

---