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Data was acquired from an isotope ratio mass spectrometer using Isodat 3.0 software.<\/p>\n
Particulate Nitrogen calculations:<\/strong> Refer to the following publication for more information:<\/strong> Summary of methods from Dabundo et al. 2014:<\/strong> Dunaliella tertiolecta cultures:<\/em> Particulate nitrogen isotope ratio analyses:<\/em> The delta 15N of Dunaliella tertiolecta<\/em> organic matter after growth in media equilibrated with 15N2 gas.<\/p>\n Refer to the following publication for more information: See related datasets: Samples with the same ID are replicated measurements.<\/p>\n BCO-DMO Edits:
\nThe equation describing the linear regression of the standards' observed delta 15N PN and Assigned delta 15N (obs = x and assigned = y) was used to calculate delta 15N PN (y) of the samples from the uncorrected delta 15N (x).<\/p>\n
\nDabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N\u2013Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:10.1371\/journal.pone.0110335<\/a><\/p>\n
Reagents:<\/em>
\nFour lecture bottles of 98+ at% 15N-labeled N2 gas were purchased from Sigma-Aldrich, three from lot # SZ1670V, and one from lot # MBBB0968V. Two 1L lecture bottles of 98+ at% 15N2 were purchased from Cambridge Isotopes from lot #\u2019s I1-11785A and I-16727. One 1L lecture bottle of 98+ at% 15N2 was purchased from Campro Scientific from lot # EB1169V. Ammonium and nitrate solutions were prepared with salts or with solutions obtained from different distributors: sodium nitrate (NaNO3), potassium nitrate (KNO3), and ammonium chloride (NH4Cl) from Fisher Scientific; analytical-grade potassium nitrate from Fluka Analytical and a gravimetric solution of ammonium chloride from SPEX CertiPrep.<\/p>\n
\nThe marine green alga Dunaliella tertiolecta<\/em> was cultured in growth media equilibrated with 15N2 gas in order to ascertain the susceptibility of 15N-labeled gas contaminants to assimilation by non-N2-fixing organisms. Culture medium was prepared from filtered Long Island Sound sea water supplemented with 50 umol\/L NaNO3, 36.3 umol\/L NaH2PO4*H2O, and 107 umol\/L Na2SiO3*9H2O, as well as f\/2 trace metals and f\/2 vitamins, added from filter sterilized stock solutions. Medium (200 mL) was dispensed in 250 mL stoppered glass bottles. Experimental treatment bottles were equilibrated overnight with 0.2 mL 15N2 gas from either a Cambridge Isotopes or Sigma-Aldrich lecture bottle. Following inoculation, cultures were left loosely capped and placed on a windowsill with exposure to natural light. Nitrate concentrations were monitored daily. Upon the complete depletion of nitrate, 8 days after inoculation, the cultures were harvested on pre-combusted GF\/F filters. Filters were dried at 60 degrees C for 18 hours pending N isotopic analysis of the particulate nitrogen.<\/p>\n
\nThe d15N of particulate nitrogen (PN) was analyzed using a Costech Instruments elemental combustion system (model 4010) coupled to a Thermo Scientific Delta V Advantage IRMS. Analyses were standardized using L-glutamic acid reference materials, USGS-40, and USGS-41.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Particulate Nitrogen - The delta 15N of Dunaliella tertiolecta organic matter after growth in media equilibrated with 15N2 gas.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
\nDabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N\u2013Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:10.1371\/journal.pone.0110335<\/a><\/p>\n
delta 15N NO3<\/a>
delta 15N NH4<\/a>
direct N2O<\/a>
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\n- Modified parameter names to conform with BCO-DMO naming conventions;
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