Nitrogen utilization efficiency

Two studies (44,63) had shown that growth performance and nitrogen retention efficiency of chicks were severely reduced by the inclusion of raw full fat winged bean seeds at rates of up to 400g/kg in semi-purified diets. Heat treatment of winged beans prior to dietary incorporation results 1n reversal of the growth depression and increases the efficiency of food utilization. 

PTFE polytetrafluoroethylene PUFA polyunsaturated fatty acid PV peroxide value PVDF polyvinylidene difluoride PVP polyvinylpyrrolidone PVPP polyvinylpolypyrolidone RAS retronasal aroma stimulator RDA recommended dietary allowance RF radio frequency RFI relative fluorescence intensity RI retention index RNU relative nitrogen utilization ROESY rotational nuclear Overhauser enhancement spectroscopy RP-HPLC reversed-phase HPLC RPER relative protein efficiency ratio RS resistant starch RT retention time RVP relative vapor pressure S sieman (unit of conductance)... 

Stolte, W., Panosso, R., Gisselson, L. A., and GraneH, E. (2002). Utilization efficiency of nitrogen associated with riverine dissolved or nic carbon (>1 kDa) by two toxin-producing phytoplankton... 

Table III shows that preformed exogenous amino acids or peptides are not utilized efficiently as nitrogen sources for strain PS. Whether or not Casitone was present in the medium, NH4 utilized by growing cells was great. In fact, for a given amount of growth more NH4 was utilized in the medium containing amino acids and peptides than in that contain-...

Ammonium fixation is also a factor that affects the efficiency of nitrogen utilization (see Chapter 11). If the soil is high in 2 1 type minerals much of the ammonium will be fixed and thereafter be nitrified or released to crops only slowly. Under some conditions this may be an advantage, but present information indicates that it is more likely to be a... 

Plant population, and genetic characteristics of many crops, such as com, wheat and sorghums, are also factors that need to be considered in outlining the fertilization program. The new hybrid varieties of the grain crops, and similarly of coastal bermudagrass, will utilize efficiently considerably more nitrogen than the older varieties. 

How were the simple precursors of the pyrimidine ring recognized In 1943, Barnes and Schoenheimer showed that heavy nitrogen from N-ammonium citrate was incorporated into animal polynucleotides. It was apparent as early as 1944 that orotate (6-carboxyuracil) was involved in pyrimidine biosynthesis, because this compound would satisfy the pyrimidine requirement for some bacteria [see review (5)]. Between 1949 and 1952 it became apparent that orotate was probably an intermediate in pyrimidine biosynthesis because this compound was utilized efficiently in mammalian tissues as a precursor of both DNA and RNA p uimidines. However, the possibility remained that orotate per se w as not an actual intermediate, but rather was easily converted to one. 

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