Crop production is the single largest cause of human alteration of the global nitrogen cycle. We present a comprehensive assessment of global nitrogen flows in cropland for the year 2000 with a spatial resolution of 5 arc-minutes. We calculated a total nitrogen input (IN) of 136.60 trillion grams (Tg) of N per year, of which almost half is contributed by mineral nitrogen fertilizers, and a tota...

The nitrogen balance can serve as an indicator of the risk to the environment of nitrogen loss from agricultural land. To investigate the temporal and spatial changes in agricultural nitrogen application and its potential threat to the environment of the Haihe Basin in China, we used a database of county-level agricultural statistics to calculate agricultural nitrogen input, output, surplus int...

The clinical description of periodic catatonia is well documented by the earliest exponents of psychiatry. Gjessing (1935) carried out extensive metabolic and clinical studies in cases of periodic catatonia. He reported diphasic course of nitrogen metabolism associated with periodic mental changes and described 3 types of syntonic synchronous (S.S.) periodic catatonias, Type A, B and C. (Gjessi...

We studied nutrient balance in a paddy field that had a recycling irrigation system and evaluated the effect of the irrigation system on nutrient balance during the irrigation period, from April to August 2002. Chemical fertilizer was the main input of phosphorus; the soil absorbed about 56% of it. The amount of nitrogen supplied by the irrigation system was higher than in a representative padd...

Since the year 1939, when preparations of protein digests became generally available in America, reports of investigations designed to test their value in the parenteral feeding of infants have appeared from time to time. ' Amigen,' an enzymic digest of hydrolysed casein, is one of these preparations. Shohl, Butler, Blackfan, and McIlan (1939), using ' amigen ' as the sole source of nitrogen in...