I N PREVIOUS work, it was found that the ‘osmotic ceiling’ in the urine from the desert rodents Heteromyidae is exceptionally high compared with the osmotic ceiling in urine from other mammals. This mechanism is of importance to water conservation. The general objective of the further investigations was to find in what respects the function of the heteromyid kidney differs from that of other ma...

The renal handling of urea has been studied by many investigators on a host of animals. It has been found that urea is actively secreted by certain species (Munro, '53; Forster, '54), reabsorbed by others (Smith, '31a, b), and in some the renal handling seems to be entirely passive (Shannen, '36). The aglomerular goose fish (Lophius piscatorius) is reportedly able to secrete urea actively from ...

Urea and uraease (U-ase) activity were determined in water samples taken from the surface layers of 17 lakes of different trophic status. Urea concentrations were inversely correlated with the trophic status of the studied lakes and varied from below the detection limit to 25 micromol l(-1). Maximal potential ureolytic activity (V(max)) ranged from 0.2 to 7.0 micromol l(-1) h(-1). The highest u...

The objective of this work was to study the effect of sewage sludge compost on ammonia and nitrate accumulation in the olive-grove soil. This study has been conducted since 1998. To evaluate sewage sludge compost on soil-grove four treatments were set up in a clay loam soil in Seseña (Toledo, Spain). Every experiment was replicated four times. The applied treatments were sewage sludge compost (...

Field experiments were conducted at the South farm in Karunya Institute of Technology and Sciences, Division Agronomy, Coimbatore, during Rabi season 2022. The experimental site is situated western agro-climatic zone Tamil Nadu, a latitude 10°56'N longitude 76°44'E, with an elevation 474 meters above mean sea level. soil composition field was identified as clay loam, moderately drained, exhibit...

The study “Influence of bio-fertilizers on vegetative growth, flower quality and bulb yield gladiolus (Gladiolus grandiflorus L.)”, field experiments conducted during 2020-21. Bulbous is a very well-liked plant. Pliny the Elder (2379 AD) first used term "gladiolus" to refer blade's sword-like form (Latin word means sword). Gladiolus delicate perennial herbaceous plant that may be cultivated fro...

Foliar urea application on barley plants increased leaf urease activity for 5 hours with a peak of 20-fold at 2 hours. To discern the mode of urease induction, urea with or without inhibitors and [35S]methionine were incubated with leaf sections for different lengths of time. Urease was extracted, partially purified, electrophoresed, and then quantified by fluorogram. Five urease (U) isozymes w...

Sixteen Friesian cows were used in Expt 1 to measure the effect of substituting urea-N with fishmeal-N either in early lactation (Part 1) or in mid-lactation (Part 2). In Part 1 (days 15-84 of lactation) the major N constituent of the concentrate was urea (U), urea-N: fishmeal-N in the ratio 2:1 (UF) or 1:2 (FU), or fishmeal (F). In Part 2 (days 84-175 of lactation) only urea (UM) and fishmeal ...