The National Institute of Health of Japan, Tokyo (Received for publication, March 30, 1950) Evolutional steps of -nitrogen requirements of bacteria have been set up as follows. N2-N03-NH4-amino nitrogen-amino nitrogen+growth factor. Dysentery bacilli belong to the last step (3, 4, 6). As shown in the preceding report (5), Shigella dysenteriae (Shiga type) belongs to the transition zone between ...

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The amorphous platinum greens, which were synthesized from Pt ( N H s ) ~ ( H ~ O ) ~ (N03)2 or from Pt(NH3)2(H20)2(S04) and uridine, 5-bromouridine and ftorafur, were studied in the solid state by anomalous small angle x-ray scattering. The intensity curves exhibit a power-law dependence, which is likely to originate from large aggregates that are quite compact yet have rough surfaces. The sur...

A single component hard sphere description molten halides and nitrates, applied to self-diffusion and viscosity data, has led to a hard sphere size which for a given cation depends linearly upon the anionic radius. This correlation has been used to predict viscosity coefficients of fused alkali fluorides and to estimate the effective size of the N03~-anion in molten nitrates. The Stokes-Einstei...

In a heterogeneous electrolyte system of a strongly basic anion exchanger and solutions of NaBF4 or NaClC>4 we established the influence of the nature and concentration of the eluent in chromatographic experiments on chlorine isotope separation. Results show that when the electrolyte concentration is increased the degree of isotope separation decreases. With NaBF4 the separation factor is great...

The main contributors of high nitrate concentrations in the groundwater of the Vanisadhara River basin are the point sources associated with livestock barns while the seasonal variations in nitrate (N03) concentrations are attributed to the prevailing hydrogeological conditions. The observed increase in nitrate under rising water level conditions, contradicting an expected decrease due to dilut...

Weeds are a major problem in seeding rangeland and cropland to native grasses. However, many immature weedy forbs and grasses are palatable to cattle. Research was conducted using yearling cattle for weed control in big bluestem (Andropogon gerardii var. gerardii Vitman) seedings (1987, 1988) at Mead, Nebraska on a Sharpsburg silty clay loam (fine, montmorillonitic, mesic Typic Argiudoll) soil....

Recent evidence associates the persistence of invasive plant species with disturbance and fluctuations in distinct forms of mineral N in soils. We conducted soil and hydroponic experiments to investigate the influence of N form and availability on germination and seedling development of 2 invasive annual grasses, cheatgrass (Bromus tectorum) and medusahead (Taeniatherum caput-medusae) and 6 per...