CMldmyuOnas rihardii cells, growning photoautotropbical under air, excreted to the culture medium much higher amounts of N02 and NH4 I under ble than under red fight. Under shmilar conditions, but with N02as the only nitrogen source, the cells consumed NO2 and excreted NH4, at shilar rates under blue and red light. In the presence of N03and air with 2% CO2 (v/v), no excretion of NOand NH1+ occu...

The chemistry of streamwater, bulk precipitation, throughfall and soil waters has been studied for three years in two plantation forest and two moorland catchments in midWales. Na and CI are the major ions in streamwater reflecting the maritime influence on atmospheric inputs. In all streams, baseflow is characterised by high pH waters enriched in Ca, Mg, Si and HC03. Differences in baseflow ch...

nutrient in estuaries. Phosphorus enters surface waters in both dissolved and particulate form and is generally Much of the nonpoint N and P entering surface waters of the the limiting nutrient in lakes. A large portion of the N Midwest is from agriculture. We determined if constructed wedands could be used to reduce nonpoint N and P exports from agricultural and P now entering U.S. freshwater ...

We examined nitrate assimilation and root gas fluxes in a wildtype barley (Hordeum vulgare L. cv Steptoe), a mutant (narla) deficient in NADH nitrate reductase, and a mutant (narla;nar7w) deficient in both NADH and NAD(P)H nitrate reductases. Estimates of in vivo nitrate assimilation from excised roots and whole plants indicated that the narla mutation influences assimilation only in the shoot ...

During three consecutive years (1991-93), a field experiment was conducted in 3n intensively irrigated agricultural sail in SW Spain. The maio objective of tbis study was to determine the water flow and nitrate leaching below tbe root zone~ under an irrigated maize crop and after the growing season (bare soil and rainy periad). The experiment was carried out on a furrow irrigated maize crop usi...

in Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum and antibiotics. Cells were grown at 37°Cin a humidified 5% CO2 atmosphere. †̃fransfection. Thefull-lengthN03cDNAwas insertedintotheEcoRlre striction site of pMEXneo expression vector (13) in the forward orientation. The expression vector containing N03 cDNA or the expression vector alone was introduced independent...

A variety of management options are used to minimize losses of nitrogen (N), phosphorus (P), and other potential pollutants from agricultural source areas. There is little information available, however, to indicate the effectiveness of these options (sometimes referred to as Best Management Practices, or BMPs) on basin scales. The objective of this study was to assess the water quality effecti...

Nitrate Poisoning Farmers and ranchers depend on the successful combination of livestock and crops. Forage crops, in particular, are important to the producer, but they should be monitored due to plant toxicants that can be a problem. One toxicosis of concern is Nitrate (N03 ) toxicity. Nitrate toxicity of cattle was noted as early as 1895 with corn-stalk poisoning. However, at that time nitrat...

Z. Naturforsch. 55 b, 1131-1136 (2000); received July 24, 2000 Heterodinuclear Complex, Super-Exchange Interactions, Lanthanides Preparation, crystal structure and magnetic properties of a heterodinuclear complex, LCu(Me2C0 )Gd(N03)3 (L = (N,N'-bis(3-methoxysalicylidene)propane1,2-diamine) are re­ ported. The crystal structure of the complex was determined by X-ray diffraction methods at 200 K....

Childs River and Quashnet River, combined with the absence of such spikes at Sage Lot and Flat Ponds, suggests input by plumes from septic tanks. Mean NI&+ concentration in groundwater varied over a relatively small range across the three sites (Fig. 1, middle panels). NH4+ contributed less than 5% of the mean dissolved inorganic nitrogen (DIN) at Childs and Quashnet Rivers. Most of the inorgan...