• Stable carbon isotope ratio in xylotrophic fungi and their substrates Mukhin, V. (deepdyve.com)
  • It is shown that coniferous substrates are more enriched in the heavy carbon isotope, compared to deciduous substrates. (deepdyve.com)
  • In both cases, however, their carbon isotope composition is characterized by low variability and does not correlate with the species or physiological type of decomposer fungus but shows a statistically significant correlation with the degree of wood mineralization. (deepdyve.com)
  • This trophic shift lacks species specificity, is equally manifested in decomposers of deciduous and coniferous substrates, remains unchanged along the latitudinal climatic gradient, and is positively correlated with the carbon isotope composition of substrates, in the absence of correlation with the degree of their mineralization. (deepdyve.com)
  • In addition, low δ15N_[coral] (+0.8∼+2.0‰) four months after the last typhoon implied nitrogen fixation because of the lack of typhoon upwelling through the four years record of δ15N_[coral]. (hokudai.ac.jp)
  • Choi, W.J., 2002, Natural 15 N abundances and source identification of nitrogen in soil-plant-groundwater system as affected by chemical fertilizer and composted manure. (springer.com)
  • Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems, and climate forcing. (usgs.gov)
  • Skeletons were collected at Okinotori Island in southwestern Japan, far from any sources of terrestrial nitrogen. (hokudai.ac.jp)
  • Analysis of media isotope enrichment during substrate depletion revealed relationships between net discrimination and external N concentration. (springer.com)
  • Nitrogen isotope data show that the regions of oceanic anoxia were marked by intense water-column denitrification in which cyanobacteria were the principal source of fixed N. In the overlying peak glacial interval of the Hirnantian, sedimentary successions from localities representing a wide range of water depths and paleolatitudes indicate that anoxia was restricted during the early-mid-Hirnantian. (geoscienceworld.org)
  • The extremely strong bond in elemental nitrogen dominates nitrogen chemistry, causing difficulty for both organisms and industry in breaking the bond to convert the N 2 into useful compounds, but at the same time causing release of large amounts of often useful energy when the compounds burn, explode, or decay back into nitrogen gas. (waystoworld.com)
  • Nitrogen occurs in all living organisms, and the nitrogen cycle describes movement of the element from the air into the biosphere and organic compounds, then back into the atmosphere. (waystoworld.com)
  • Lavoisier's name for nitrogen is used in many languages (French, Polish, Russian, etc.) and still remains in English in the common names of many compounds, such as hydrazine and compounds of the azide ion. (waystoworld.com)
  • Nitrogen compounds were well known during the Middle Ages. (waystoworld.com)
  • The earliest military, industrial, and agricultural applications of nitrogen compounds used saltpetre (sodium nitrate or potassium nitrate), most notably in gunpowder, and later as fertilizer. (waystoworld.com)
  • The resulting difficulty of converting N 2 into other compounds, and the ease (and associated high energy release) of converting nitrogen compounds into elemental N 2 , have dominated the role of nitrogen in both nature and human economic activities. (waystoworld.com)
  • Farquhar GD, O'Leary MH, Berry JA (1982) On the relationship between carbon isotope discrimination and the intercellular carbon dioxide concentration in leaves. (springer.com)
  • Fractionation of heavy and light isotopes of nitrogen ( 15 N vs. 14 N), carbon ( 13 C vs. 12 C), and hydrogen (D vs. H) can provide information about metabolic pathways and reaction mechanisms within living organisms ( 1 ⇓ ⇓ - 4 ). (pnas.org)
  • Organic matter soluble in CCl_4 has essentially no nitrogen, and δ^(13)C and δD values are lower than for CH_3OH-soluble phases. (caltech.edu)
  • Nitrogen ( / ˈ n aɪ t r ɵ dʒ ɨ n / ny -trə-jin ) is a chemical element that has the symbol N , atomic number of 7 and atomic mass 14.00674 u. (waystoworld.com)
  • Brooks PD, Stark JM, McInteer BB, Preston T (1989) Diffusion method to prepare soil extracts for automated nitrogen-15 analysis. (springer.com)
  • Organisms that use ammonium as the sole nitrogen source discriminate between [ 15 N] and [ 14 N] ammonium. (pnas.org)
  • For example, fractionation between 15 N and 14 N during incorporation of ammonium N in a single-celled organism like Escherichia coli is determined by the rate-limiting step for assimilating it into glutamate, the precursor of 88% of cellular nitrogen-containing material ( 5 ). (pnas.org)
  • Although E. coli lives in the human gut, which is nitrogen-rich, it also survives in fresh and brackish water, in which supplies of available ammonium can be limited ( 9 , 10 ). (pnas.org)
  • Integration of our N isotope data with graptolite biodiversity records suggests that the extinctions were profoundly influenced by changes occurring at the base of the marine food web, i.e., redox-driven changes in nutrient cycling and primary producer communities. (geoscienceworld.org)
  • In synthesizing data from over 6000 soil samples, we show strong global relationships among soil N isotopes, mean annual temperature (MAT), mean annual precipitation (MAP), and the concentrations of organic carbon and clay in soil. (usgs.gov)
  • Karsh, Kristen Leigh and Antarctic CRC, 2004 , 'Relationship of nitrogen isotope fractionation to phytoplankton size and iron availability during the Southern Ocean Iron RElease Experiment (SOIREE)', Unspecified thesis, University of Tasmania. (edu.au)
  • At high NH 3 (≥0.89 µM), discrimination against the heavy isotope by the WT strain (−19.2‰) can be accounted for by the equilibrium isotope effect for dissociation of NH 4 + to NH 3 + H + . NH 3 equilibrates across the cytoplasmic membrane, and glutamine synthetase does not manifest an isotope effect in vivo. (pnas.org)
  • Bergersen FJ, Peoples MB, Turner GL (1988) Isotopic discrimination during the accumulation of nitrogen by soybeans. (springer.com)
  • To address this challenge, aqueous reduction experiments with an Al2O3-supported Pd/In bimetallic catalyst were conducted using isotope-labeled nitrite (15NO2-), the first reduction intermediate of NO3-, alone and in combination with unlabeled proposed reduction intermediates (N2O, NO), and using N2O and NO alone, each as a starting reactant. (illinois.edu)
  • Simultaneous catalytic reduction of 15NO2- and 14N2O showed no isotope mixing in the final N2 product, demonstrating that N2O does not react with other NO2- reduction intermediates. (illinois.edu)
  • Eghball B, Maranville JW (1993) Root development and nitrogen influx of corn genotypes grown under combined drought and nitrogen stresses. (springer.com)
  • It is accompanied by a return to intensely denitrifying conditions within the water column, as indicated by the shift to negative N isotope values. (geoscienceworld.org)
  • The work is part of several subprojects of the SFB754 with the aim to decipher nitrogen pathways in the water column and in the benthic boundary layer of the eastern tropical South Pacific and tropical Atlantic Oceans. (ocean-partners.org)