ライフサイエンスコーパス: isotope ratio

1 n-era Gale crater smectite to determine this isotope ratio.

2 elements, 14 carbohydrates and stable carbon isotope ratio.

3 hange towards less radiogenic Nd, Hf, and Pb isotope ratios.

4 17), to underpin the dynamical drivers of TC isotope ratios.

5 he determination of compound-specific carbon isotope ratios.

6 of measurement for both hydrogen and oxygen isotope ratios.

7 h Element (REE) concentrations with Sr-Nd-Pb isotope ratios.

8 ized by a distinctive combination of H and O isotope ratios.

9 nants needed for accurate measurement of the isotope ratios.

10 bank) are the major determinants of measured isotope ratios.

11 changes in both (13)C/(12)C and (15)N/(14)N isotope ratios.

12 accurate determination of low (236)U/(238)U isotope ratios.

13 owth and a gradual increase in stable oxygen isotope ratios.

14 Stable isotope ratios ((13)C/(12)C and (15)N/(14)N) of South Af

15 Stable isotope ratios ((13)C/(12)C and (15)N/(14)N) of South Af

16 turally occurring carbon and nitrogen stable isotope ratios [13C/12C (CIR) and 15N/14N (NIR)] are pro

17 Stable nitrogen isotope ratios ((15)N/(14)N, delta(15)N) are of particul

18 Lead concentrations [Pb] and isotope ratios ((206)Pb/(207)Pb, (208)Pb/(207)Pb) have b

19 ple, sensitive, and robust method for sulfur isotope ratio ((34)S/(32)S) analysis of ppm-level organi

20 tical approaches to determine 5 light stable isotope ratios, 57 mineral elements and 14 carotenoids.

21 To determine accurate isotope ratios, a quantitative conversion of the carbon

22 ellent reproducibility, the variation of the isotope ratios along a single ablation line indicated is

23 ry indicators, including boron and strontium isotope ratios, along with groundwater tritium-helium an

24 For the case of Cu and Zn isotope ratio analyses, the same mass concentration of S

25 Stable isotope ratio analysis can therefore be proposed as a su

26 Stable isotope ratio analysis combined with elemental analysis

27 We combined this method with stable isotope ratio analysis of bulk plant tissue and plant-de

28 ld be differentiated in shrimps using stable isotope ratio analysis of carbon and nitrogen and/or mul

29 In this study, stable isotope ratio analysis of hydrogen (H, delta(2)H), carbo

30 d for organic authentication based on stable isotope ratio analysis of oxygen in plant-derived sulpha

31 no acid quantitation and amino-acid-specific isotope ratio analysis of scalp hair of American individ

32 cross-validated accuracies of 80% using the isotope ratios and 89% using amino acid quantities.

33 In this research, phosphate oxygen isotope ratios and Bayesian modeling on fingerprinting e

34 Isotope ratios and percentage composition for C and N we

35 The study analyses stable isotope ratios and provides full HPLC-DAD-MS characteris

36 stablished relationships between leaf carbon isotope ratios and the ratio of intracellular to ambient

37 The measured U isotope ratios and U concentration in the hair, toenail,

38 mono isotopic ion and up to three isotopes, isotope ratios, and a peak/noise filter.

39 Molybdenum (98)Mo/(95)Mo isotope ratios are a sediment paleo proxy for the redox

40 Organic carbon (13)C/(12)C isotope ratios are commonly obtained as whole-molecule a

41 It can be shown that the isotope ratios are correlated with the altitude and prec

42 sources are distinct (p = 0.0001) and blood isotope ratios are most similar to turmeric.

43 Hydrogen and oxygen isotope ratios are of use to determine the origin of mat

44 mber of the populations and their respective isotope ratios are unknown.

45 The method also has a potential for stable isotope ratio as well as chemical analysis to find indic

46 We used soil organic carbon isotope ratios as a proxy for changes in woody vegetatio

47 the possibilities of using zinc (Zn) stable isotope ratios as dietary indicators, we report here on

48 This is the first time that (236)U/(238)U isotope ratios as low as 10(-10) were determined by ICP-

49 tope analysis (CSIA) of nitrogen- and carbon-isotope ratios at natural abundances as an alternative a

50 opy to determine the bulk (13)C/(12)C carbon isotope ratio, at natural abundance, in inorganic carbon

51 This work aims to employ an (18)O-isotope ratio-based analytical method for quantitative e

52 ellular metabolites were quantified using an isotope-ratio-based approach.

53 We also compared isotope ratios between glacial-marine and more oceanic h

54 ated as the difference of substrate-specific isotope ratios between inflow and outflow.

55 A dual-isotope plot of the changes in isotope ratios between two elements produces a slope, la

56 erved in the (235)U/(238)U and (236)U/(238)U isotope ratios but not the (234)U/(238)U.

57 the measured (63)Cu/(65)Cu and (64)Zn/(66)Zn isotope ratios by -0.036 per thousand to -0.95 per thous

58 e possibility of measuring low (236)U/(238)U isotope ratios can offer a large variety of geochemical

59 Carbon isotope ratio (CIR) confirmation is one of the most comp

60 multidecadal record of annual foliar carbon isotope ratio collections coupled with 39 y of survey da

61 ark is famous for its high helium-3/helium-4 isotope ratio, commonly cited as evidence for a deep man

62 Analyses of stable metal isotope ratios constitute a novel tool in order to impro

63 l-derived proteins in our diets, hair carbon isotope ratios could provide an approach for scaling ass

64 The hydrogen isotope ratio (D/H) is commonly used to reconstruct the

65 The fine isotope ratio data filtering step distinguished (34)S/(1

66 nce ion chromatography (HPIC), carbon stable isotope ratio (delta(13)C) by isotope ratio mass spectro

67 C and nitrogen (N) concentrations and stable isotope ratios (delta(13) C and delta(15) N) in the Nort

68 tracer of past rainfall by analysing carbon isotope ratios (delta(13) C) of modern leaves.

69 ci inferred from studies reporting C stable isotope ratios (delta(13) C) or photosynthetic discrimin

70 one and enamel apatite rely mainly on carbon isotope ratios (delta(13)C) and to a lesser extent on st

71 Serial carbon isotope ratios (delta(13)C) in canine enamel from indivi

72 d as proxies for trophic position and carbon isotope ratios (delta(13)C) indicated foraging habitat.

73 set of carbon, hydrogen, and chlorine stable isotope ratios (delta(13)C, delta(2)H, delta(37)Cl) of i

74 Nitrogen stable isotope ratios (delta(15) N) may be used to estimate com

75 Nitrogen isotope ratios (delta(15)N) were used as proxies for tro

76 Here we used phosphate oxygen isotope ratios (delta(18)O(P)) in concert with sediment

77 Bone collagen hydrogen isotope ratios (delta(2)H) in cattle (and to a lesser ex

78 Stable magnesium isotope ratios (delta(26)Mg) also meet these criteria bu

79 Calcium isotope ratios (delta(44)Ca) meet these criteria but exh

80 uous tooth enamel as marked variations in Ca isotope ratios (delta(44/42)Ca).

81 Of the bulk isotope ratios, delta(15)N was the most significant para

82 temperature (based on the deuterium/hydrogen isotope ratio deltaD(ice), a proxy for regional temperat

83 tion of sulfur species prior to their online isotope ratio determination by MC-ICPMS.

84 pose Delta(13)C as an analytical measure for isotope ratio deviances instead of widely employed C dev

85 Observed dual-element isotope ratios differed slightly from literature values

86 The isotope ratios disclosed the majority of the females to

87 try (NanoSIMS), which reveals a comparable U isotope ratio distribution at the same spatial scale.

88 logy for accurate detection of (236)U/(238)U isotope ratios down to 10(-10), which is so far mainly a

89 delta(2)H and Deltadelta(13)C are changes in isotope ratios during degradation) resulted in clearly d

90 hat contains the measurements of (18)O/(16)O isotope ratios during oxygen-18 isotopic exchange betwee

91 At the same time the delta(18)O isotope ratio fell within legal limits when the final et

92 chlorinated biomolecules by the use of mass isotope ratio filters followed by the identification of

93 Population mean carbon isotope ratios fluctuated predictably in response to int

94 Stable carbon and nitrogen isotope ratios for all three individuals were within the

95 re was evidence from distribution and stable isotope ratios for differences in habitat use and diving

96 cision is offset by the ability to determine isotope ratios for enriched uranium specimens with a pre

97 ve found overlapping strontium and neodymium isotope ratios for Levantine and Egyptian glass.

98 on-specific isotope analysis (PSIA) provides isotope ratios for the individual carbons within a molec

99 Based on the Pb isotope ratios for the red inclusions within Trinitite,

100 antitative precipitation record using carbon isotope ratios from a single species of leaf preserved i

101 a new climate proxy based on paired hydrogen isotope ratios from microalgal and mangrove-derived sedi

102 Carbon isotope ratios from terrestrial plant wax biomarkers dep

103 We interpret our record of oxygen isotope ratios from the shells of the long-lived marine

104 Carbon isotope ratios, geographical and climate data, fossil re

105 Multi-element stable isotope ratios have been assessed as a means to distingu

106 Uranium isotope ratios have been determined on reference standar

107 Stable isotope ratios have been successfully applied to determi

108 Se isotope ratios help to trace biochemical processes of Se

109 ully adopted to characterize the (13)C/(12)C isotope ratio in inorganic carbonates and bicarbonates w

110 e and precise determination of (82)Se/(78)Se isotope ratio in natural samples of environmental and bi

111 eveloped and applied for analysis of C and N isotope ratios in amino acids derived from tomatoes.

112 nd Pu and can be used to obtain quantitative isotope ratios in any user-defined square region up to a

113 a mass-dependent manner, yielding correlated isotope ratios in elements with three or more stable iso

114 Carbon and nitrogen isotope ratios in hair sampled from 65 communities acros

115 ion was primarily based on elevated nitrogen isotope ratios in Neandertal bone collagen and has been

116 seasonally and interannually depleted oxygen isotope ratios in precipitation have been linked to the

117 d by historical records of Pb content and Pb isotope ratios in sediment profiles.

118 en, carbon, and amino acid specific nitrogen isotope ratios in six species distributed across differe

119 We measured He-Sr-Pb isotope ratios in superdeep diamond fluid inclusions fro

120 The similarity in Pb isotope ratios in suspended and sinking particles implie

121 ed light on key processes governing rainfall isotope ratios in the MAC region during continental and

122 Stable carbon and nitrogen isotope ratios in the skeletal elements of both ancient

123 h were characterized by exceptionally high N isotope ratios in their bulk bone or tooth collagen.

124 Changes in Pb isotope ratios in TSP depositions in these years indicat

125 The delta(18)O isotope ratio increased with D and decreased with MC.

126 (in this case a Vertex 70 V (Bruker)) or an isotope ratio infrared spectrometer (IRIS) (in this case

127 Isotope-ratio infrared spectroscopy (IRIS) offers a chea

128 verall discrimination potential of strontium isotope ratio is evidenced in the final statistical disc

129 The observed precision of isotope ratios is limited by the number of ions counted.

130 Determination of uranium isotope ratios is of great expedience for assessing its

131 The proportionality between isotope ratios is set by the triple isotope fractionatio

132 37)Cs distribution patterns, (135)Cs/(137)Cs isotope ratios, known Cs chemistry at this site, and his

133 Breath samples were analyzed on an isotope ratio mass spectrometer for 13C enrichment.

134 lticollector magnetic sector field gas-phase isotope ratio mass spectrometer.

135 uantify MPS via gas chromatography:pyrolysis:isotope ratio mass spectrometer.

136 gh-temperature conversion elemental analyzer:isotope ratio mass spectrometer.

137 easured by a gas chromatograph coupled to an isotope ratio mass spectrometer.

138 reducing extensive maintenance and costs of isotope ratio mass spectrometers (IRMS).

139 were analysed with bulk Elemental Analysis - Isotope Ratio Mass Spectrometry (EA-IRMS), high-resoluti

140 ed compound determined by elemental analyzer-isotope ratio mass spectrometry (EA-IRMS).

141 N2 (delta(15)N2) was monitored via gas bench isotope ratio mass spectrometry (GB-IRMS) for 21 days.

142 A gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) based method

143 Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) for the anal

144 suitability of gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) for the anal

145 (15)N(Arg)) by gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS), to further

146 l3) was explored by both, gas chromatography-isotope ratio mass spectrometry (GC-IRMS) and GC-quadrup

147 ios of NDMA by gas chromatography coupled to isotope ratio mass spectrometry (GC/IRMS).

148 combustion in gas chromatography combustion isotope ratio mass spectrometry (GCC-IRMS).

149 rall hydrogen isotope analysis via GC-Cr/HTC-isotope ratio mass spectrometry (IRMS) achieved a precis

150 egions along the Italian coasts, by means of isotope ratio mass spectrometry (IRMS) and resonant Rama

151 atios were analysed in bulk olive oils using Isotope Ratio Mass Spectrometry (IRMS) as well as (13)C/

152 ct the geographic origin of lentils by using isotope ratio mass spectrometry (IRMS) in combination wi

153 atural silicon due to storing and during the isotope ratio mass spectrometry (IRMS) measurements were

154 Isotope Ratio Mass Spectrometry (IRMS), (1)H Nuclear Mag

155 carbon stable isotope ratio (delta(13)C) by isotope ratio mass spectrometry (IRMS), and trace elemen

156 different vegetation types were measured by isotope ratio mass spectrometry (IRMS), to evaluate it a

157 were analysed using electronic nose (EN) and isotope ratio mass spectrometry (IRMS), with the aim of

158 en in the past for these measurements, i.e., isotope ratio mass spectrometry (IRMS), with very encour

159 asurement of these two isotope ratios, using isotope ratio mass spectrometry (IRMS).

160 ambs from different regions were measured by isotope ratio mass spectrometry (IRMS).

161 Here, we introduce a novel laser ablation-isotope ratio mass spectrometry (LA-IRMS) methodology th

162 In liquid chromatography coupled to isotope ratio mass spectrometry (LC-IRMS), analytes are

163 before analysis using liquid chromatography-isotope ratio mass spectrometry (LC-IRMS).

164 cal samples by gas chromatography combustion isotope ratio mass spectrometry analysis (GC-C-IRMS).

165 ectrometry and gas chromatography-combustion isotope ratio mass spectrometry for deuterium enrichment

166 on dioxide isotopologue (13)C(16)O(18)O with isotope ratio mass spectrometry is difficult due to isob

167 microextraction gas chromatograph-combustion-isotope ratio mass spectrometry method (HS-SPME-GC-C-IRM

168 ultiple reaction monitoring (MRM) assays for isotope ratio mass spectrometry of most metabolites in a

169 s (CF), by combining the high sensitivity of isotope ratio mass spectrometry with a heavy water label

170 by LC-IRMS (liquid chromatography coupled to isotope ratio mass spectrometry).

171 by complementary methods (gas chromatography-isotope ratio mass spectrometry, GC-IRMS, versus gas chr

172 tamination of silver phosphate generated for isotope ratio mass spectrometry, the TSM protocol is abl

173 e performed by gas chromatography/combustion/isotope ratio mass spectrometry.

174 were determined by using elemental analyzer-isotope ratio mass spectrometry.

175 hesis (MPS) via gas chromatography-pyrolysis-isotope ratio mass spectrometry.

176 gnatures were measured using continuous flow isotope ratio mass spectrometry.

177 spectrometry (GC-MS) and gas chromatography-isotope ratio mass spectromety (GC-IRMS) analyses on a s

178 ining an ion trap mass spectrometer (MS) and isotope-ratio mass spectrometer (IRMS).

179 he (13)C flux through sugar metabolites with isotope-ratio mass spectrometry (IR-MS), Fourier transfo

180 been profiled using a combination of stable isotope-ratio mass spectrometry (IRMS) and proton nuclea

181 and liquid organic samples with analysis by isotope-ratio mass spectrometry (IRMS).

182 delta(15)N) of DPC by liquid chromatography-isotope-ratio mass spectrometry (LC-IRMS) and derivatiza

183 ng by stable isotope labeling and combustion isotope-ratio mass spectrometry for precise quantificati

184 etermination of (15)N isotopic enrichment by isotope-ratio mass spectrometry to measure N2 emissions

185 scopy (IRIS) offers a cheaper alternative to isotope-ratio mass spectroscopy (IRMS), but its use in s

186 In addition to the conventional mass and isotope ratio matches, we would match annotated fragment

187 N, coincident with high dissolved Pb and Pb isotope ratios matching Asian industrial sources and con

188 es coinciding with rapidly decreasing carbon isotope ratios may in part be the result of a radical re

189 Magnesium isotope ratios measured at a concentration level of 7-10

190 The carbon stable isotope ratios measured by conventional IRMS technique a

191 Using stable isotope ratios measured in squid beaks recovered from di

192 We further demonstrate that stable isotope ratios measured on in-house standards of unknown

193 When isotope ratio measurement techniques like thermal ioniza

194 ns separated are suitable for high precision isotope ratio measurements by TIMS or MC-ICP-MS, as demo

195 Stable isotope ratio measurements have been used as a measure o

196 Selenium isotope ratio measurements in solution in the CaCO3 and

197 ficient sample preparation method in view of isotope ratio measurements is described, allowing the se

198 We conclude that Zn isotope ratio measurements of bone and teeth are a new a

199 rove sensitivity, accuracy, and precision of isotope ratio measurements of plutonium when compared to

200 w sample loading procedure was developed for isotope ratio measurements of ultratrace amounts of plut

201 r findings suggest potential for water vapor isotope ratio measurements to be used in conjunction wit

202 t Sr isotope analyses, MgAr(2+) may impair S isotope ratio measurements, while CaAr(2+) may cause int

203 concentration as the analyte elements, also isotope ratio measurements.

204 S-SSB), and ORM-SSB were compared for the Se isotope ratio measurements.

205 13)C-enriched CO2 samples, a newly developed isotope ratio mid-infrared spectrometer was introduced w

206 paration process and, finally, measuring the isotope ratios modified by the isotope dilution process.

207 This can be accessed by isotope ratio monitoring (13)C NMR spectrometry.

208 sotope effects (PSIEs) have been measured by isotope ratio monitoring (13)C nuclear magnetic resonanc

209 Isotope ratio monitoring by (13)C NMR spectrometry (irm-

210 Relatively recent developments in isotope ratio monitoring by (13)C NMR spectrometry make

211 y (irm-(13)C NMR) was mainly used to measure isotope ratio monitoring with the potential of conductin

212 Here we use a large data set of water stable isotope ratios (n = 1150) to show that newly formed rupt

213 compared, with the integration method, i.e., isotope ratios obtained by dividing the corresponding si

214 Total ion counts ((239)Pu + (242)Pu) and isotope ratios obtained from fiber-loaded filaments were

215 The nitrogen stable isotope ratio of NOx (delta(15)N-NOx) has been proposed

216 lution model output of the amount and oxygen-isotope ratio of rainfall from an isotope-enabled climat

217 two independent chemical water tracers (the isotope ratios of (231)Pa/(230)Th and (143)Nd/(144)Nd),

218 patial variation in the oxygen and strontium isotope ratios of 155 baboons from 77 locations to estim

219 Lead concentrations and lead isotope ratios of 43 authentic Bordeaux wines from prest

220 To date the stable isotope ratios of berries have never been extensively ex

221 d polar bear feeding habits with bulk stable isotope ratios of carbon and nitrogen.

222 and nitrous oxide) as well as carbon stable isotope ratios of carbon dioxide and methane, above and

223 Isotope ratios of Cd were determined in the bulk C and A

224 Stable carbon and nitrogen isotope ratios of collagen from bone and dentin have fre

225 d Canada, were analysed obtaining the stable isotope ratios of delta(13)C, delta(15)N, delta(2)H, del

226 The carbon, nitrogen and sulphur isotope ratios of feed and fillet were highly positively

227 human deciduous teeth and the N and C stable isotope ratios of four human remains from the Grotta Pag

228 we investigated the chemical composition and isotope ratios of groundwater samples from the roll-fron

229 Stable isotope ratios of HCHs cover the ranges from -233 per th

230 We measured Hg concentrations and stable isotope ratios of Hg, carbon, and nitrogen in the feathe

231 ybdates, a new approach for determination of isotope ratios of individual thiomolybdate species was d

232 The radiogenic isotope ratios of kimberlites of different ages enable u

233 The stable isotope ratios of light elements are a promising set of

234 The carbon isotope ratios of milk protein and milk fat as well as t

235 Using CSIA, the isotope ratios of multiple elements (delta(13)C, delta(2

236 Carbon and hydrogen isotope ratios of NDMA function as fingerprints of the N

237 ed the precise quantification of C, N, and H isotope ratios of NDMA in aqueous samples at concentrati

238 Measurements of the stable isotope ratios of nitrogen ((15)N/(14)N) and oxygen ((18

239 Along with manganese concentrations, isotope ratios of nitrogen and a high number of Rare Ear

240 ce suggests a relatively faster change in Pb isotope ratios of North Pacific deep water below the WSA

241 The (13)C/(12)C, (14)C/(12)C, and (2)H/(1)H isotope ratios of PAHs were determined in forest soils f

242 Isotope ratios of Pb in seawater and in the soluble frac

243 horus to nitrogen, and carbon ratios, oxygen isotope ratios of phosphate in vegetation, and phosphata

244 On the basis of relative isotope ratios of protonated molecules and measures of e

245 table isotope data of oxygen, and radiogenic isotope ratios of strontium for 84 radiocarbon-dated ske

246 (iv) a systematic shift in sulfur and oxygen isotope ratios of sulfate, indicative of microbial sulfa

247 It was shown that oxygen isotope ratios of sulphate from organic vegetables were

248 Although the Sr isotope ratios of the grapes do not show a strong correl

249 ovel explanation for the discrepancy between isotope ratios of the soil water profile and other water

250 The Pb isotope ratios of the three sources are distinct (p = 0.

251 elationship exists between the (87)Sr/(86)Sr isotope ratios of the wine and the grapes.

252 nsible for the differentiation of the oxygen isotope ratios of wine water.

253 characterised in terms of the (87)Sr/(86)Sr isotope-ratio of musts from the 2010, 2011 and 2012 vint

254 We report here both C and N isotope ratios on single amino acids of collagen samples

255 hydrogen and oxygen, while determining both isotope ratios on the same sample.

256 le, by modeling intake using multiple stable isotope ratios or by isolating and measuring specific mo

257 g, did not have any measurable effect on the isotope ratios or quantities of amino acids in the hair.

258 Stable isotope ratios provide a quantitative indication of, rat

259 In particular, the (236)U/(238)U isotope ratio provides a powerful tool to discriminate b

260 Ca isotope ratios rapidly increase with the pH and calcite

261 erived from fossil fuels will have noble gas isotope ratios reflecting a radiogenic component that wi

262 The isotope ratio results suggest direct ingestion of metall

263 NMR instrument, in order to obtain accurate isotope ratio results.

264 Measurements of stable isotope ratios revealed highly pronounced hydrogen fract

265 acific cores recorded Pacific-type neodymium isotope ratios, revealing deep westward flow equivalent

266 of these and other oxyanions are measured by isotope-ratio sector mass spectrometers after conversion

267 Pb isotope ratios showed notable alignments in binary mixin

268 Nitrogen isotope ratios showed that NH2Cl is the source of the N

269 The variations in isotope ratio, such as (18) O/(16) O (delta(18) O) and (

270 s, major- and trace elements, and Sr-Nd-Pb-O isotope ratios, supporting that the two outcrops represe

271 eloped using a new coupled carbon and oxygen isotope ratio technique in an exceptionally well-dated s

272 The soils yield Sr isotope ratios that are intimately related to the local

273 through modeling of Sr-Nd-Pb abundances and isotope ratios that the primitive Oraefajokull melts cou

274 retention time (R(t)) prediction models, and isotope ratio to generate intermediate and global scorin

275 After normalization of W isotope ratios to a pair of W isotopes, following the ex

276 ltaneous monitoring of the (18)O/(16)O and W isotope ratios to correct oxide interferences on a per-i

277 We use uranium (U) isotope ratios to detect and quantify the extent of natu

278 uation, which relates the change in measured isotope ratios to the decreasing substrate fractions and

279 ituents (trace-, ultra-trace elements and Sr isotope ratios) to assess the origin of world famous bra

280 Large-scale surveys of carbon-isotope ratios typically show a strongly bimodal frequen

281 tive substrates for measurement of these two isotope ratios, using isotope ratio mass spectrometry (I

282 iation of 0.0012 (0.117%) from the certified isotope ratio value of NBL CRM Pu128 was measured when f

283 MA and N(area) ) and chi (from stable carbon isotope ratios) varied almost independently among specie

284 Multielement isotope ratio was assessed in fat and defatted (protein)

285 ology for the determination of stable carbon isotope ratio was evaluated in comparison with the metho

286 From the hydrogen isotope ratios, we show that the mantle sources of these

287 Delta values of the (82)Se/(78)Se isotope ratio were measured in selenium-enriched yeast-c

288 2.5 +/- 0.1 ug g(-1) while the (90)Sr/(88)Sr isotope ratios were 6.47 +/- 0.17 x 10(-8) and 9.04 +/-

289 lution composition, speciation of Se, and Se isotope ratios were determined during both sets of exper

290 Stable Pb isotope ratios were measured and compared to U distribut

291 The (87)Sr/(86)Sr isotope ratios were measured on grape, wine and soil sam

292 and Sr ((87)Sr/(86)Sr = 0.70923 +/- 0.00024) isotope ratios were not consistent with the expected iso

293 adult males and 20 adult females and stable isotope ratios were quantified every 5 mm along the leng

294 form of imaging mass spectrometry quantifies isotope ratios with a lateral resolution <50 nm, using a

295 Here we present nitrogen isotope ratios with a mean of 0.0 +/- 1.2 per thousand f

296 CSIA profiles showed large shifts of carbon isotope ratios with depth (up to 24 per thousand) sugges

297 ble to accurately and reproducibly determine isotope ratios with FT-ICR-MS.

298 This shift is reflected in oxygen isotope ratios with low values (- 8 to - 10 per mille) d

299 lybdates, collecting each peak and analyzing isotope ratios with multicollector inductively coupled p

300 shown here to have indistinguishable oxygen isotope ratios, with a difference in Delta'(17)O of -1 +