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At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1995

Effect of pH and calcium on short-term NO3- fluxes in roots of barley seedlings

The effect of pH and Ca2+ on net NO3- uptake, influx, and efflux by intact roots of barley (Hordeum vulgare L.) seedlings was studied. Seedlings were induced with NO3- or NO2-. Net NO3- uptake and efflux, respectively, were determined by following its depletion from, and accumulation in, the external solution. Since roots of both uninduced and NO2(-)-induced seedlings contain little internal NO3- initial net uptake rates are equivalent to influx (M. Aslam, R.L. Travis, R.C. Huffaker [1994] Plant Physiol 106: 1293-1301). NO3-, uptake (influx) by these roots was little affected at acidic pH. In contrast, in NO3(-)-induced roots, which accumulate NO3-, net uptake rates decreased in response to acidic pH. Under these conditions, NO3- efflux was stimulated and was a function of root NO3- concentration. Conversely, at basic pH, NO3- uptake by NO3- and NO2(-)-induced and uninduced roots decreased, apparently because of the inhibition of influx. Calcium had little effect on NO3- uptake (influx) by NO2(-)-induced roots at either pH 3 or 6. However, in NO3(-)-induced roots, lack of Ca2+ at pH 3 significantly decreased net NO3- uptake and stimulated efflux. The results indicate that at acidic pH the decrease in net NO3- uptake is due to the stimulation of efflux, whereas at basic pH, it is due to the inhibition of influx.

Non-NASA Center↗
NASA NTRS2001

Nitrate concentration effects on NO3-N uptake and reduction, growth, and fruit yield in strawberry

Strawberries (Fragaria xananassa Duch. 'Osogrande') were grown hydroponically with three NO3-N concentrations (3.75, 7.5, or 15.0 mM) to determine effects of varying concentration on NO3-N uptake and reduction rates, and to relate these processes to growth and fruit yield. Plants were grown for 32 weeks, and NO3-N uptake and nitrate reductase (NR) activities in roots and shoots were measured during vegetative and reproductive growth. In general, NO3-N uptake rates increased as NO3-N concentration in the hydroponics system increased. Tissue NO3- concentration also increased as external NO3-N concentration increased, reflecting the differences in uptake rates. There was no effect of external NO3-N concentration on NR activities in leaves or roots during either stage of development. Leaf NR activity averaged approximately 360 nmol NO2 formed/g fresh weight (FW)/h over both developmental stages, while NR activity in roots was much lower, averaging approximately 115 nmol NO2 formed/g FW/h. Vegetative organ FW, dry weight (DW), and total fruit yield were unaffected by NO3-N concentration. These data suggest that the inability of strawberry to increase growth and fruit yield in response to increasing NO3-N concentrations is not due to limitations in NO3-N uptake rates, but rather to limitations in NO3- reduction and/or assimilation in both roots and leaves.

NASA Center KSC↗
DOE OSTI2022

Increased Arctic NO3− Availability as a Hydrogeomorphic Consequence of Permafrost Degradation and Landscape Drying

Climate-driven permafrost thaw alters the strongly coupled carbon and nitrogen cycles within the Arctic tundra, influencing the availability of limiting nutrients including nitrate (NO3−). Researchers have identified two primary mechanisms that increase nitrogen and NO3− availability within permafrost soils: (1) the ‘frozen feast’, where previously frozen organic material becomes available as it thaws, and (2) ‘shrubification’, where expansion of nitrogen-fixing shrubs promotes increased soil nitrogen. Through the synthesis of original and previously published observational data, and the application of multiple geospatial approaches, this study investigates and highlights a third mechanism that increases NO3− availability: the hydrogeomorphic evolution of polygonal permafrost landscapes. Permafrost thaw drives changes in microtopography, increasing the drainage of topographic highs, thus increasing oxic conditions that promote NO3− production and accumulation. We extrapolate relationships between NO3− and soil moisture in elevated topographic features within our study area and the broader Alaskan Coastal Plain and investigate potential changes in NO3− availability in response to possible hydrogeomorphic evolution scenarios of permafrost landscapes. These approximations indicate that such changes could increase Arctic tundra NO3− availability by ~250–1000%. Thus, hydrogeomorphic changes that accompany continued permafrost degradation in polygonal permafrost landscapes will substantially increase soil pore water NO3− availability and boost future fertilization and productivity in the Arctic.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2025

High-Resolution Photoelectron Spectroscopy of NO3 – Vibrationally Excited Along Its ν3 Mode

The nitrate (NO3) radical has long been the subject of both experimental and theoretical studies due to its complex electronic structure resulting from vibronic interactions between its X̃2A2' and B̃2E' states. In particular, the definite assignment of the fundamental of its degenerate stretching vibration (ν3) is still under debate. Here, we report high-resolution photoelectron spectra of vibrationally pre-excited NO3- using the recently developed IR-cryo-SEVI technique. The anions are excited through infrared (IR) excitation near 1350 cm-1, accessing the ν3 and 2ν3(e') vibrational levels with band centers at 1350.5 and ∼2700 cm-1, respectively. The IR-cryo-SEVI spectrum for 2ν3 pre-excitation shows clear evidence for an intense 321 transition. From the position of this feature (30031 cm-1), the electron affinity of NO3 also determined in this work (31680 cm-1), and the IR excitation energy, we obtain a fundamental frequency of 1051 cm-1 for the ν3 fundamental of the NO3 radical. This assignment and other features in the IR-cryo-SEVI spectra are supported by spectral simulations based on a vibronic Köppel-Domcke-Cederbaum Hamiltonian. The simulations also show that nearly all features in the IR-cryo-SEVI spectra arise because of pseudo-Jahn-Teller coupling between the X̃ and B̃ states of NO3. The results and analysis presented here settle a long-standing controversy regarding the ν3 frequency of NO3.

Anions↗
NASA NTRS1988

Characteristics of injury and recovery of net NO3- transport of barley seedlings from treatments of NaCl

The nature of the injury and recovery of nitrate uptake (net uptake) from NaCl stress in young barley (Hordeum vulgare L, var CM 72) seedlings was investigated. Nitrate uptake was inhibited rapidly by NaCl, within 1 minute after exposure to 200 millimolar NaCl. The duration of exposure to saline conditions determined the time of recovery of NO3- uptake from NaCl stress. Recovery was dependent on the presence of NO3- and was inhibited by cycloheximide, 6-methylpurine, and cerulenin, respective inhibitors of protein, RNA, and sterol/fatty acid synthesis. These inhibitors also prevented the induction of the NO3- uptake system in uninduced seedlings. Uninduced seedlings exhibited endogenous NO3- transport activity that appeared to be constitutive. This constitutive activity was also inhibited by NaCl. Recovery of constitutive NO3- uptake did not require the presence of NO3-.

Non-NASA Center↗
DOE OSTI2026

Synoptic NO3 in Slate River Watershed, Colorado (2022)

The synoptic nitrate (NO3) dataset in the Slate River Watershed, Colorado consists of NO3 data collected at 19 locations three times during the summer of 2022. Stream samples were collected in early summer (early July), mid summer (late August), and late summer (late September). The samples include mainstem, tributary, and point source input water samples. These data were collected to evaluate spatiotemporal variability in stream NO3 during the summer, and evaluate anthropogenic controls on stream NO3 dynamics. This data package contains: (1) a csv of all NO3 samples and (2) a csv of locations for each sampling site. The dataset additionally includes a file-level metadata (flmd.csv) file that lists each file contained in the dataset with associated metadata; and a data dictionary (dd.csv) file that contains column/row headers used throughout the files along with a definition, units, and data type. This work was supported by the Watershed Function Science Focus Area at Lawrence Berkeley National Laboratory funded by the US Department of Energy, Office of Science, Biological and Environmental Research under Contract No. DE-AC02-05CH11231.

EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATE↗
NASA NTRS1986

Possible role of NO3 in the nighttime chemistry of a cloud

The NO3 radical in the aqueous phase is a strong oxidizing agent which reacts rapidly with a wide variety of inorganic and organic species. Within nighttime clouds the production of gaseous NO3 from the reaction of NO2 with O3 followed by heterogeneous scavenging of NO3 by cloud droplets can represent a significant source of these reactive radicals to cloud water. Model calculations indicate that in addition to leading to the production of NO3(-) in cloud water, this aqueous-phase source of NO3 can, under the appropriate conditions and depending upon the values for a number of uncertain rate constants, have a significant impact upon the rate of conversion of SO2 to H2SO4.

Chameides, W. L.↗
NASA NTRS1986

Temperature dependence of the NO3 absorption spectrum

The absorption spectrum of the gas-phase NO3 radical has been studied between 220 and 700 nm by using both flash photolysis and discharge flow reactors for the production of NO3. In the flash photolysis method, cross sections at the peak of the (0,0) band at 661.9 nm were measured relative to the cross section of ClONO2 at several different wavelengths. From the best current measurements of the ClONO2 spectrum, the NO3 cross section at 661.9 nm was determined to be (2.28 + or 0.34) x 10 to the -17th sq cm/molecule at 298 K. Measurements at 230 K indicated that the cross section increases by a factor of 1.18 at the peak of the (0,0) band. The discharge flow method was used both to obtain absolute cross sections at 661.9 nm and to obtain relative absorption spectra between 300 and 700 nm at 298 and 230 K. A value of (1.83 + or - 0.27) x 10 to the -17th sq cm/molecule was obtained for sigma NO3 at 661.9 nm at 298 K. Upper limits to the NO3 cross sections were also measured between 220 and 260 nm with the discharge flow method.

Sander, Stanley P.↗
NASA NTRS1990

Efficiency of N use by wheat as a function of influx and efflux of NO3

Since N assimilation is one of the most costly functions of a plant, its efflux before assimilation results in a serious energy cost and loss in efficiency which could decrease yields. Efficient crop production is critical to the Closed Ecology Life Support System (CELSS). The objective is to determine the extent of efflux of the N species NO3(-), NH4(+), NO2(-), and urea after uptake, and possible means of regulation. Researchers found that NO3 efflux became serious as its substrate level increased. Efflux/Influx (E/I) of NO3(-) was greater in darkness (35 percent) than in light (14 percent), and the ratio greatly increased with substrate NO3 (-), (up to 45 percent at 10 mM). It seems advantageous to use the lowest possible nutrient concentration of NO3(-). The feasibility of using ClO3(-) was assessed and its toxicity determined.

Huffaker, R. C.↗
NASA NTRS1986

The uptake of NO3-, NO2-, and NH4+ by intact wheat (Triticum aestivum) seedlings. I. Induction and kinetics of transport systems

The inducibility and kinetics of the NO3-, NO2-, and NH4+ transporters in roots of wheat seedlings (Triticum aestivum cv Yercora Rojo) were characterized using precise methods approaching constant analysis of the substrate solutions. A microcomputer-controlled automated high performance liquid chromatography system was used to determine the depletion of each N species (initially at 1 millimolar) from complete nutrient solutions. Uptake rate analyses were performed using computerized curve-fitting techniques. More precise estimates were obtained for the time required for the extent of the induction of each transporter. Up to 10 and 6 hours, respectively, were required to achieve apparent full induction of the NO3- and NO2- transporters. Evidence for substrate inducibility of the NH4+ transporters requiring 5 hours is presented. The transport of NO3- was mediated by a dual system (or dual phasic), whereas only single systems were found for transport of NO2- and NH4+. The Km values for NO3-, NO2-, and NH4+ were, respectively, 0.027, 0.054, and 0.05 millimolar. The Km for mechanism II of NO3- transport could not be defined in this study as it exhibited only apparent first order kinetics up to 1 millimolar.

NASA Program CELSS↗
DOE OSTI2020

Materials Data on Co(NO3)4 by Materials Project

Co(NO3)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four Co(NO3)4 clusters. In two of the Co(NO3)4 clusters, Co4+ is bonded in a distorted pentagonal bipyramidal geometry to seven O2- atoms. There are a spread of Co–O bond distances ranging from 1.91–2.17 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.22–1.35 Å. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.22–1.30 Å. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.32 Å. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.31 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted L-shaped geometry to one Co4+ and one N5+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the fourth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the fifth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to one Co4+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the tenth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the eleventh O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the twelfth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In two of the Co(NO3)4 clusters, Co4+ is bonded in a distorted pentagonal bipyramidal geometry to seven O2- atoms. There are a spread of Co–O bond distances ranging from 1.94–2.27 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.23 Å) and one longer (1.35 Å) N–O bond length. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.31 Å. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.22–1.31 Å. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.31 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the second O2- site, O2- is bonded in a distorted L-shaped geometry to one Co4+ and one N5+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Co4+ and one N5+ atom. In the fourth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the sixth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the seventh O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the ninth O2- site, O2- is bonded in a water-like geometry to one Co4+ and one N5+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the twelfth O2- site, O2- is bonded in an L-shaped geometry to one Co4+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn(NO3)4 by Materials Project

Mn(NO3)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four Mn(NO3)4 clusters. In two of the Mn(NO3)4 clusters, Mn4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Mn–O bond distances ranging from 2.01–2.50 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.34 Å. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.32 Å. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.35 Å. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.32 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted L-shaped geometry to one Mn4+ and one N5+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Mn4+ and one N5+ atom. In the fifth O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a distorted L-shaped geometry to one Mn4+ and one N5+ atom. In the seventh O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the ninth O2- site, O2- is bonded in an L-shaped geometry to one Mn4+ and one N5+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the eleventh O2- site, O2- is bonded in an L-shaped geometry to one Mn4+ and one N5+ atom. In the twelfth O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In two of the Mn(NO3)4 clusters, Mn4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Mn–O bond distances ranging from 2.02–2.44 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.34 Å. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.34 Å. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.32 Å. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.21–1.32 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the second O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the third O2- site, O2- is bonded in a distorted L-shaped geometry to one Mn4+ and one N5+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the fifth O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a distorted L-shaped geometry to one Mn4+ and one N5+ atom. In the seventh O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a water-like geometry to one Mn4+ and one N5+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one N5+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to one Mn4+ and one N5+ atom. In the twelfth O2- site, O2- is bonded in a distorted L-shaped geometry to one Mn4+ and one N5+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS1979

The problem of nighttime stratospheric NO3

Detailed calculations of the behavior of the NO3 column content as a function of time after sunset show that it takes nearly 2 hours to increase from daytime values of approximately 10 to the 11th/sq cm to nighttime values of 10 to the 14th/sq cm. These results appear to be in conflict with the measured NO3-concentration rise time of 40 min after sunset obtained from the 662-nm absorption data of Noxon et al. (1978). Changes in the rate constants affecting the NO, NO2, NO3, N2O5 system, the atmospheric temperature, and the amount of NO2 are not able to bring the calculated rise time for the NO3 column content into agreement with observations.

Herman, J. R.↗
NASA NTRS1988

The equilibrium constant for N2O5 = NO2 + NO3 - Absolute determination by direct measurement from 243 to 397 K

Direct determinations of the equilibrium constant for the reaction N2O5 = NO2 + NO3 were carried out by measuring NO2, NO3, and N2O5 using long-path visible and infrared absorption spectroscopy as a function of temperature from 243 to 397 K. The first-order decay rate constant of N2O5 was experimentally measured as a function of temperature. These results are in turn used to derive a value for the rate coefficient for the NO-forming channel in the reaction of NO3 with NO2. The implications of the results for atmospheric chemistry, the thermodynamics of NO3, and for laboratory kinetics studies are discussed.

Cantrell, C. A.↗
DOE OSTI2020

Materials Data on BiH5(NO3)3 by Materials Project

BiH(NO3)3(H2)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of eight hydrogen molecules and two BiH(NO3)3 clusters. In each BiH(NO3)3 cluster, Bi2+ is bonded in a 6-coordinate geometry to one H1+ and five O2- atoms. The Bi–H bond length is 1.89 Å. There are a spread of Bi–O bond distances ranging from 2.37–2.54 Å. There are three inequivalent N+3.67+ sites. In the first N+3.67+ site, N+3.67+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.22–1.31 Å. In the second N+3.67+ site, N+3.67+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.22–1.31 Å. In the third N+3.67+ site, N+3.67+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.30 Å. H1+ is bonded in a single-bond geometry to one Bi2+ atom. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one N+3.67+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Bi2+ and one N+3.67+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Bi2+ and one N+3.67+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Bi2+ and one N+3.67+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one N+3.67+ atom. In the sixth O2- site, O2- is bonded in a distorted water-like geometry to one Bi2+ and one N+3.67+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one N+3.67+ atom. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Bi2+ and one N+3.67+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one N+3.67+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on P2H16PbC6(NO3)2 by Materials Project

(C3PH8)2Pb(NO3)2 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional and consists of eight trimethylphosphine molecules and one Pb(NO3)2 framework. In the Pb(NO3)2 framework, Pb2+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.65–3.16 Å. N3- is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.26–1.29 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Pb2+ and one N3- atom. In the second O2- site, O2- is bonded in a single-bond geometry to one Pb2+ and one N3- atom. In the third O2- site, O2- is bonded in a single-bond geometry to one Pb2+ and one N3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb5Nd2W(NO3)11 by Materials Project

WRb5Nd2(NO3)11 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional and consists of four tungsten molecules and one Rb5Nd2(NO3)11 framework. In the Rb5Nd2(NO3)11 framework, there are three inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Rb–O bond distances ranging from 2.91–3.17 Å. In the second Rb1+ site, Rb1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Rb–O bond distances ranging from 2.95–3.47 Å. In the third Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Rb–O bond distances ranging from 2.99–3.20 Å. Nd3+ is bonded to twelve O2- atoms to form corner-sharing NdO12 cuboctahedra. There are a spread of Nd–O bond distances ranging from 2.56–2.79 Å. There are six inequivalent N+4.45+ sites. In the first N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.29 Å. In the second N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.25 Å) and two longer (1.28 Å) N–O bond length. In the third N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. In the fourth N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.29 Å. In the fifth N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.29 Å. In the sixth N+4.45+ site, N+4.45+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.26 Å) and one longer (1.28 Å) N–O bond length. There are seventeen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Rb1+ and one N+4.45+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Nd3+ and one N+4.45+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Nd3+ and one N+4.45+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Rb1+, one Nd3+, and one N+4.45+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to two Rb1+ and one N+4.45+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to two Rb1+ and one N+4.45+ atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Rb1+ and one N+4.45+ atom. In the fourteenth O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the fifteenth O2- site, O2- is bonded in a single-bond geometry to two equivalent Nd3+ and one N+4.45+ atom. In the sixteenth O2- site, O2- is bonded in a single-bond geometry to one Rb1+, one Nd3+, and one N+4.45+ atom. In the seventeenth O2- site, O2- is bonded in a distorted single-bond geometry to two Rb1+ and one N+4.45+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS1986

Effects of NO3(-) and NH4(+) and urea on each other's uptake and incorporation

The purpose was to determine the optimal use by wheat plants of the N sources expected from processing biological waste products, NO3(-),NO2(-)NH4(+), and urea. The approach was to determine the uptake and metabolic products of each N source (from single and multiple component solutions), inhibitory effects of each, feedback inhibition, and overall in vivo regulation of the rates of assimilation of each by wheat plants. Previously, researchers determined the interactions of NO3(-),NO2(-),NH4(+) on each other's uptake and incorporation. The assimilation and some of its effects on NO3(-) and NH4(+) assimilation which have been completed to data are discussed.

Huffaker, R. C.↗