Phosphorus is essential to all forms of life and its contribution towards aiding the native soil fertility sustaining it, well known. With passage time, P added undergoes transformation into various unavailable forms. Native compounds, some being highly insoluble are mostly for plant uptake. The availability phosphorus plants depends on properties, pH, soluble iron, aluminum manganese, calcium ...

The chemical composition of manure P is a key factor determining its potential bioavailability and susceptibility to runoff. The distribution of P forms in 13 dairy manures was investigated with sequential fractionation coupled with orthophosphate-releasing enzymatic hydrolysis. Among the 13 dairy manures, manure total P varied between 4100 and 18,300 mg kg(-1) dry matter (DM). Water-extractabl...

The 13C content of microbial products are controlled by many factors, including the 13C content of the growth substrate, growth rate, the flux of carbon through various parts of the biochemical network, and the isotopic fractionation imposed by the enzymes of that network. We analyzed the 13C content of products of the methanogen Methanosarcina barkeri and found that fractionation varied strong...

We used the Hedley sequential fractionation scheme to assess phosphorus (P) chemistry of a strongly weathered soil from a humid lowland forest in Panama. Our analyses were part of a factorial experiment of nitrogen, P, and potassium addition, with nutrients added annually, i.e. a chronic input. The aim was to examine changes in soil P chemistry with 7 years of nutrient addition for soils collec...

1. The factor 1.67 to be used to convert the weight of cholesterol present in the esterified form into weight of cholesterol ester. (Kelsey and Longenecker, J. Biol. Chem. 139:727,1941) 2. The ratio free cholesterol/total cholesterol to be expressed as a decimal and to be the accepted form of expressing the relative quantities of free and esterified cholesterol. 3. The factor 25 to be used to c...