A nitrogen (N) budget was developed for four, 400-m ponds stocked with 550 channel catfish (Ictalurus punctatus) fingerlings that were fed to satiation daily for 133 days with a ration containing 4.85% N. Feed accounted for 87.9% of the N input to ponds. Abundant N from ammonia (NH3), ammonium (NH4 ), and nitrate (NO3 ) and the high total N: total phosphorus ratio in pond waters prevented appre...

Introduction Conclusions References

We describe an apparatus modified for the chemiluminescent estimation of nitrogen in biological and clinical samples. Analytical characteristics have been assessed and results compared with those by the traditional Kjeldahl method. The chemiluminescence method, much faster and more sensitive than the traditional method, is at least as accurate, precise, and reproducible. Costs are low, and the ...

BACKGROUND We previously reported that a weight-maintenance diet with a carbohydrate:protein:fat ratio of 30:30:40%, ingested for 5 weeks, improved blood glucose control in subjects with untreated type 2 diabetes. In this study we also determined that insulin and insulin-like growth factor-I (IGF-I) were increased. In this report we provide further information. Specifically, 24-hour total and i...

Surface water nitrate (NO~-) pollution from agricultural production is well established, although few studies have linked field N budgets, NO~loss in tile drained watersheds, and surface water NO~loads. This study was conducted to determine field sources, transport, and river export of NO~from an agricultural watershed. The Embarras River watershed at Camargo (48 173 ha) in east-central Illinoi...

The main purpose of this study is to perform a nitrogen budget survey for the entire Brazilian Amazon region. The main inputs of nitrogen to the region are biological nitrogen fixation occurring in tropical forests (7.7 Tg.yr(-1)), and biological nitrogen fixation in agricultural lands mainly due to the cultivation of a large area with soybean, which is an important nitrogen-fixing crop (1.68 T...

UNLABELLED Supplemental oxygen maintained during and for 2 h after colon resection halves the incidence of nausea and vomiting. Whether supplemental oxygen restricted to the intraoperative period is sufficient remains unknown. Similarly, the relative efficacy of supplemental oxygen and ondansetron is unknown. We tested the hypothesis that intraoperative supplemental oxygen reduces the incidence...

OBJECTIVE The effects of heat treatment, supplementation of a mineral and vitamin premix, and 4% olive oil on the bioavailability of protein and calcium from Lens culinaris M., var vulgaris, cultivar. magda-20 were studied in growing rats. METHODS Nutrition assessment was based on chemical analysis of lentil protein, energy, total and available starch, lipid and calcium composition, and the d...

A mass-balance approach was used to estimate in-stream processes related to inorganic nitrogen species (NH4C, NO2 and NO3 ) in a large river characterized by highly variable hydrological conditions, the Garonne River (south-west France). Studies were conducted in two consecutive reaches of 30 km located downstream of the Toulouse agglomeration (population 760 000, seventh order), impacted by mo...