PHOSPHORUS EXCRETION BY ZOOPLANKTON

Phosphorus distribution in three crustacean zooplankton species

The distribution of phosphorus (P) was assessed in homogeneously 33P-labeled Daphnia magna, Daphnia galeata and Eudiaptomus gracilis. The specific P contents were 1.48, 1.41, and 0.50% of dry weight (DW), respectively. The results support the view of low intraspecific variability in P : DW ratios in crustacean zooplankton. The fraction of P allocated to nucleic acids, phospholipids, and other P...

Decreasing Nitrogen and Phosphorus Excretion by Dairy Cattle

In 1996, the Council for Agricultural Science and Technology (CAST) published a report entitled Integrated Animal Waste Management. One of the recommendations in that report was to “change animal diets to decrease nutrient outputs” (CAST 1996, 1). Since that time, concentration of animal production units has continued, public concern about the environmental effects of animal manure has increase...

Excretion of a phosphorus-containing carbohydrate by Streptomyces sp. A50.

A new phosphorus-containing compound (1) was detected by (31)P NMR spectroscopy in Streptomyces sp. A50. Compound 1, 1(alpha)-O-methyl-2-(N-acetyl)glucoseamine-6-O-phosphate-1(alpha)-2-(N-acetyl)glucosamine, exhibited a pK(a) value around zero. The compound was found both in the extracellular culture broth and in the cells. While very low concentrations of 1 were found in the culture broth of o...

The Excretion of Calcium , Phosphorus , and Mag -

The effects of phosphorus depletion, and of calcium and phosphorus intake, on the endogenous excretion of these elements by sheep.

I . Injections of and 45Ca were used to study the influence of phosphorus depletion and repletion on the rates of endogenous calcium and P excretion in fifteen P-depleted and eighteen control sheep. 2. When given adequate P, there was a marked increase in the rate of excretion of metabolic faecal P in sheep which previously had been depleted. In control sheep a decrease was found in metabolic f...