The objective of this work was to evaluate the effectiveness of ruzigrass (Urochloa ruziziensis) in enhancing soil‐P availability in areas fertilized with soluble or reactive rock phosphates. The area had been cropped for five years under no‐till, in a system involving soybean, triticale/black‐oat, and pearl millet. Previously to the five‐year cultivation period, corrective phosphorus fertiliza...

Autolysis of Bacillus cereus N.R.R.L. 569 cell walls was accompanied by hydrolysis of the majority of the 4-O-beta-N-acetylglucosaminyl-N-acetylmuramic acid linkages in mucopeptide, presumably by an endo-beta-N-acetylglucosaminidase. Hydrolysis of the N-acetylmuramyl-l-alanine linkages by an amidase also occurred. Free d-alanine residues were detected in isolated cell walls and the proportion o...

Analyses of carbon stable isotopes are often used to estimate the contributions of allochthonous and autochthonous dietary resources to aquatic consumers. Most pelagic food web studies assume that all phytoplankton taxa have a similar δ13C value. We studied pelagic food web compartments (dissolved inorganic carbon [DIC], phytoplankton, bacteria, seston, cladoceran zooplankton) in 12 small (< 0....

The phosphorus (P) composition of sediment profiles in three subtropical lakes of contrasting trophic state in Florida, USA, was determined by sequential fractionation and solution P NMR spectroscopy. Sediment from Lake Annie, an oligo-mesotrophic sinkhole with moderately acidic sediment (pH 5.4; loss on ignition 58 %), contained higher total P concentrations than sediment from eutrophic Lake O...

The fate of phosphorus (P) during pedogenesis has been historically conceptualized (Walker-Syers model) with time as the primary controlling state factor. Herein, we demonstrate that both climate and lithology exert a strong interacting influence on P by examining coupled bioclimatic parent material effects soil fractions. Three transects were investigated spanning 2150-m elevation gradient (MA...

Hydrolysis of phytoglycolipid by barium hydroxide yielded the various products possible from cleavage of the phosphate diester bond (ceramide phosphate plus oligosaccharide and ceramide plus oligosaccharide phosphate). About 50% of the oligosaccharide was recovered as a phosphorus-free, amorphous solid, the analytical data for which suggested a hexasaccharide structure. Studies on the fractiona...

Background, aim, and scope Changes in bioavailability of phosphorus (P) during pedogenesis and ecosystem development have been shown for geogenic calcium phosphate (Ca-P). However, very little is known about long-term changes of biogenic Ca-P in soil. Materials and methods Long-term transformation characteristics of biogenic Ca-P were examined using anthropogenic soils along a chronosequence fr...

The nutritional value of breadmaking cereal spelt (Triticum aestivum ssp. spelta) is said to be higher than that of common wheat (Triticum aestivum ssp. vulgare), but this traditional view is not substantiated by scientific evidence. In an attempt to clarify this issue, wholemeal and milling fractions (sieved flour, fine bran, and coarse bran) from nine dehulled spelt and five soft winter wheat...