Phosphorus-32 movement

W. K. Gardner, D. A. Barber, and D. G. Barbery, The acquisition of phosphorus by Liipiniis aibiis L. III. The probable mechanism, by which phosphorus movement in the soil-root interface is enhanced. Plant Soil 70 107 (1983). 

Novak, L. T., and Adriano, D. C. (1975). Phosphorus movement in soils-. Soil-orthophosphate reaction kinetics. J. Environ. Qual. 4, 261-266. 

Hannapel, R.J., Fuller, W.H. and Fox, R.H. (1964) Phosphorus movement in calcareous soil. II. Soil microbial activity and organic phosphorus movement. Soil Science 97, 421 27. 

Beck, M.A. and Sanchez, P.A. (1 995) Soil phosphorus movement and budget after 13 years of fertilized cultivation in the Amazon basin. Plant and Soil 184, 23-31. 

Chen H, Zhang S (1991) Nitrogen and phosphorus movement from loess tillage under modeling the rainfaU-rrmoff erosion processes. Sci Geogr Sin 11(2) 142-148 (in Chinese with English abstract)... 

Munn, D.A., McLean, E.O., Ramirez, A. and Logan, T.J. (1973). Effect of soil cover, slope and rainfall factors on soil md phosphorus movement under simulated rainfall conditions. Soil Science Society of America ECoceedings, 37, 428-31. 

Phosphorus also occurs in all living things and the phosphate cycle, including the massive use of phosphatic fertilizers, is of great current interest.O 20) -pj.jg movement of phosphorus through the environment differs from that of the other non-metals essential to life (H, C, N, O and S) because it has no volatile compounds that can circulate via the atmosphere. Instead, it circulates via two rapid biological... 

Other actions of estrogen include fluid retention, protein anabolism, thinning of the cervical mucus, and the inhibition or facilitation of ovulation. Estrogens contribute to the conservation of calcium and phosphorus, the growth of pubic and axillary hair, and pigmentation of the breast nipples and genitals. Estrogens also stimulate contraction of the fallopian tubes (which promotes movement of the ovum), modify the physical and chemical properties of the cervical mucus, and restore the endometrium after menstruation. 

A (b), 2.0 A (c), and 1.9 A (d). The red and yellow areas, indicating high electron density, clearly show the movement of WAT lone pairs from the oxygen to the phosphorus. 

In a general way, the overall movement of phosphorus on the continents can be considered as the constant water erosion of rock and transport of P in both particulate and dissolved forms with surface runoff to river channels and further to the oceans. The intermediate transformations are connected with uptake of P as a nutrient by... 

Human activity has an enormous influence on the global cycling of nutrients, especially on the movement of nutrients to estuaries and other coastal waters. For phosphorus, global fluxes are dominated by the essentially one way flow of phosphorus carried in eroded materials and wastewater from the land to the oceans, where it is ultimately buried in ocean sediments. The size of this flux is currently estimated at 22 x 106 tons per year. Prior to increased human agricultural and industrial activity,... 

In some cases, resins have been used to try to determine only the plant or more generally the biological availability of an ionic species. Resins placed in soil have also been used to study ion speciation, soil microbiology, various phosphorus measurements, soil nutrient supply rate, nutrient transformations and movement, and micronutrient and metal toxicity [22-25],... 

Table VI shows the effect of 0.75% dietary zinc on the phosphorus balance in young rats. A decrease in the apparent retention of phosphorus was noted in the zinc-fed rats as early as the end of the first week. Possibly a more significant observation was the apparent movement of phosphorus excretion from the urine, the normal pathway for phosphorus excretion, to the feces in rats fed the high zinc diet. Such a shifting of the phosphorus excretion to the fecal pathway in animals fed a high zinc diet should result in an increase...

Sharma, S.R., Singh, R.P., and Ahmed, S.R. Effect of different leachates on the movement of some phosphorus containing pesticides in soils using thin layer chromatography, Ecotoxicol. Environ. Sal, ll(2) 229-240, 1986. 

The second reason for acid-digestion is the determination of the total soil elemental content of, e.g. potassium, phosphorus or trace elements. This is seldom done for potassium in normal soil samples, mainly because the total K in soils is of no value as an index to the availability of K to plants, nor is it always of value in tracing the movement or accumulation of applied fertilizer K (Pratt, 1965). The unreactive soil phosphorus is obtained by subtracting the naturally leached reactive phosphorus from the total phosphorus, and a method for determining the latter by extraction with sulphuric acid and potassium persulphate is cited by Turner and FHaygarth (2000). They analysed... 

Calcium and phosphate enter the body from the intestine. The average American diet provides 600-1000 mg of calcium per day, of which approximately 100-250 mg is absorbed. This figure represents net absorption, because both absorption (principally in the duodenum and upper jejunum) and secretion (principally in the ileum) occur. The amount of phosphorus in the American diet is about the same as that of calcium. However, the efficiency of absorption (principally in the jejunum) is greater, ranging from 70% to 90%, depending on intake. In the steady state, renal excretion of calcium and phosphate balances intestinal absorption. In general, over 98% of filtered calcium and 85% of filtered phosphate is reabsorbed by the kidney. The movement of calcium and phosphate across the intestinal and renal epithelia is closely regulated. Intrinsic disease of the intestine (eg, nontropical sprue) or kidney (eg, chronic renal failure) disrupts bone mineral homeostasis. 

FTIR spectroscopy is a more accurate method for a quick analysis of the phosphorus in thin films. However, the P205 peak in FTIR is seriously affected if the thin film becomes hydrated. Some loss of sensitivity is caused by the movement of part of the peak from the P205 region to the P205 H20 region upon hydration of the thin film (Figure 3). This shift affects the measured phosphorus content of a thin film. Also, the lack of a significant... 

The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. Unlike many other biogeochemicals, the atmosphere does not play a significant role in the... 

---