ライフサイエンスコーパス: radiocarbon

1 ting and real time monitoring of atmospheric radiocarbon.

2 an important role in modulating atmospheric radiocarbon.

3 mporary levels and highly depleted levels of radiocarbon.

4 We used the radiocarbon ((14) C) 'bomb spike' as a tracer of substra

5 ch and sugars in a subset of trees using the radiocarbon ((14) C) bomb spike.

6 ws the determination of the full spectrum of radiocarbon ((14)C) ages present in a soil or sediment s

7 m natural samples are often insufficient for radiocarbon ((14)C) analyses (<50 mug C).

8 (AMS), has been investigated for the online radiocarbon ((14)C) analysis of carbonate records.

9 Radiocarbon ((14)C) analysis revealed that B. chinensis

10 origin of two large peaks in the atmospheric radiocarbon ((14)C) concentration at AD 774/5 and 993/4

11 Many applications are sensitive to the radiocarbon ((14)C) content of atmospheric CO2, which ha

12 Analyzing the radiocarbon ((14)C) content of polycyclic aromatic hydro

13 mporal frequency distributions of aggregated radiocarbon ((14)C) dates are used as a proxy of populat

14 Existing radiocarbon ((14)C) dates on American mastodon (Mammut a

15 ugh 1962 nearly doubled the concentration of radiocarbon ((14)C) in the atmosphere.

16 Radiocarbon ((14)C) is a radioactive isotope that is use

17 Radiocarbon ((14)C) is an ideal tracer for in vivo human

18 Stable carbon ((13)C) and radiocarbon ((14)C) isotopic data demonstrate a predomin

19 sil contributions to carbonaceous particles, radiocarbon ((14)C) measurements were performed on organ

20 versity experiment (The Jena Experiment) and radiocarbon ((14)C) modelling.

21 Radiocarbon ((14)C) provides a way to date material that

22 curely dated, decadally-resolved atmospheric radiocarbon ((14)C) record spanning GS-1.

23 Here, we used the radiocarbon ((14)C) signature of microbial DNA isolated

24 and an associated incursion of an extremely radiocarbon ((14)C)-depleted water mass, interpreted to

25 e show records of carbon monoxide containing radiocarbon (14CO), which is oxidized by hydroxyl radica

26 n an earlier paper, we published a series of radiocarbon accelerator mass spectrometer measurements f

27 the opposing patterns of atmospheric CO2 and radiocarbon activities (Delta(14)C) suggest the release

28 Radiocarbon activities were measured in annual tree ring

29 We reconstructed the radiocarbon activity of intermediate waters in the easte

30 Radiocarbon activity paralleled that of the atmosphere,

31 Radiocarbon activity tracks changes in ocean ventilation

32 Using radiocarbon age also implicitly models the preferential

33 Newly applied radiocarbon age dates from the deep water proteinaceous

34 The PDMS CH3 groups are of "infinite" radiocarbon age due to the fossil carbon origin of the f

35 Reappraisal of radiocarbon age estimates through bayesian modeling, and

36 origin, which explains the observed middepth radiocarbon age maximum and may play an important role i

37 m the Southern Ocean, producing a widespread radiocarbon age maximum at mid-depths and depriving the

38 AMEs, which would lead to a maximum shift in radiocarbon age of <3 years toward older values.

39 ided in the basin for millennia, with a mean radiocarbon age of 5,800 +/- 800 years, much older than

40 easure net ecosystem carbon exchange and the radiocarbon age of ecosystem respiration in a tundra lan

41 ecific fluorescence intensity of DOM and its radiocarbon age were identified, indicating that optical

42 ir with two distinct components of differing radiocarbon age.

43 ciently high concentrations, would shift the radiocarbon ages of trapped compounds to older ages.

44 Twenty-seven new radiocarbon ages on the bones of these animals revise th

45 ols, aquolls, diatomites, or algal mats with radiocarbon ages suggesting they are stratigraphic manif

46 used 115 cosmogenic beryllium-10 ages and 70 radiocarbon ages to constrain the timing of three substa

47 Radiocarbon analyses are commonly used in a broad range

48 Radiocarbon analyses demonstrate that CH4 and CO2 are pr

49 from bulk carbon to compound class specific radiocarbon analysis (CCSRA) to determine Delta(14)C and

50 Compound-specific radiocarbon analysis (CSRA) of amino acids (AAs) is of g

51 Compound specific radiocarbon analysis (CSRA) provides powerful insight in

52 Radiocarbon analysis allowed us to elucidate cryptic die

53 In this study, we advanced the radiocarbon analysis from bulk carbon to compound class

54 Radiocarbon analysis of perylene indicated that 70-85% o

55 Using radiocarbon analysis of phospholipid fatty acids (PLFAs)

56 Radiocarbon analysis of pyrogenic PAHs showed a 50% decr

57 Radiocarbon analysis of the skulls shows that the indivi

58 latile or semivolatile organic compounds for radiocarbon analysis using accelerator mass spectrometry

59 Radiocarbon and luminescence dating of the surrounding s

60 its impact on respired carbon storage using radiocarbon and stable carbon isotope data from the Braz

61 Our results are based on coupled radiocarbon and uranium-series dates, along with clumped

62 many different aspects of the stratigraphic, radiocarbon, and archaeological evidence.

63 pyrolysis (delta(13)Cpyr), natural abundance radiocarbon, and high resolution Orbitrap mass spectrome

64 Here we use the lipid profiles, radiocarbon, and stable carbon isotopic signatures of li

65 We use infrared, radiocarbon, and stable isotope analyses to investigate

66 Radiocarbon apportionment of EC indicates that fossil so

67 Using the bomb-spike radiocarbon approach we were able to estimate the averag

68 Analyzing radiocarbon at different treatment points within municip

69 Radiocarbon-based estimates indicated that the mean age

70 explain the ~190 per mil drop in atmospheric radiocarbon between ~17 and 14.5 ka.

71 sharks (220 cm or less) showed signs of the radiocarbon bomb pulse, a time marker of the early 1960s

72 are complicated by both uncertainty over the radiocarbon calibration beyond about 21,500 14C years bp

73 and (40)Ar/(39)Ar ages for refining both the radiocarbon calibration curve and the Late Pleistocene t

74 w that sampling biases, atmospheric effects, radiocarbon calibration error, and taphonomic processes

75 proach to remove the age artifacts caused by radiocarbon calibration from a large series of dated meg

76 Radiocarbon (carbon-14) data from the Aegean Bronze Age

77 we used the continuous label offered by the radiocarbon (carbon-14, (14) C) bomb spike to estimate t

78 n addition, both gradual and rapid deglacial radiocarbon changes in these Pacific records are coeval

79 Its application yields a consistent radiocarbon chronology of all soil horizons formed betwe

80 More generally, our radiocarbon climatostratigraphic approach can be applied

81 Radiocarbon comparisons, however, show significant diffe

82 ifferentiating the two CO2 samples, with the radiocarbon concentration 3 orders of magnitude apart, C

83 ls were accompanied by increased atmospheric radiocarbon concentrations that have been attributed to

84 hydrocarbon residues were devoid of natural radiocarbon, confirming a fossil source and excluding co

85 Radiocarbon-constrained chronologies from marine sedimen

86 surements to quantify the absolute amount of radiocarbon-containing methane ((14)CH4) in the past atm

87 es and that our procedure does not introduce radiocarbon contamination.

88 , we present a full year characterization of radiocarbon content ((14) C) of dissolved organic carbon

89 e we use time-integrated observations of the radiocarbon content of CO2 ((14)CO2) to quantify the rec

90 The radiocarbon content of nucleic acids, a biomarker for vi

91 Trends in concentrations and radiocarbon content of pyrogenic PAHs and perylene were

92 ribonucleotide reductase (RR) decreased the radiocarbon content of the DNA, but not in RNA, indicati

93 The depleted radiocarbon content of the warm and salty water mass imp

94 struct changes in deep water and thermocline radiocarbon content over the last deglaciation in the ea

95 We compared ancient DNA and radiocarbon data from 31 detailed time series of regiona

96 Here we combine new radiocarbon data from the Eastern Equatorial Pacific (EE

97 Here, we report radiocarbon data from uranium-thorium-dated deep-sea cor

98 Our radiocarbon data indicate that the New Kingdom started b

99 eoretical underpinning for this expectation, radiocarbon data on watermass ventilation ages conflict,

100 Our compound-specific radiocarbon data show that the archaea in surface waters

101 n cycle impacts remains to be confirmed, the radiocarbon data suggest an increase in the efficiency o

102 The Canadian Archaeological Radiocarbon Database contains more than 35,000 (14)C dat

103 Large radiocarbon datasets have been analysed statistically to

104 d busts in the context of uncertainty in the radiocarbon date calibration curve and archaeological sa

105 We demonstrate that summed calibrated radiocarbon date distributions and simulation can be use

106 cause of the lack either of a direct hominin radiocarbon date or of molecular confirmation of the Nea

107 ulation proxy based on summed archaeological radiocarbon date probability densities.

108 ley in Iberia at ca. 36 ka calBP (calibrated radiocarbon date ranges).

109 , and Holocene climate via an archaeological radiocarbon date series of unprecedented sampling densit

110 We describe the find and identify and radiocarbon date the construction materials.

111 Quelccaya ice cap (Peru) retreats, have been radiocarbon dated and, when coupled with other widesprea

112 In 1989, it was directly radiocarbon dated by accelerator mass spectrometry to 36

113 ng terrain, deltas, and lacustrine sediments radiocarbon dated to 22.5 ka.

114 Washington state (USA) in 1996 and initially radiocarbon dated to 8,340-9,200 calibrated years before

115 Five of the individuals (directly radiocarbon dated to a time transect spanning the 7(th)-

116 numerous handstones and milling stone bases radiocarbon dated to at least 8700 calendrical years B.P

117 04 AD, around the nuclear bombs period, were radiocarbon dated.

118 Our isotope records from modern and ancient, radiocarbon-dated bones provide evidence of over 3,000 y

119 We measured Hg stable isotope signatures of radiocarbon-dated boreal forest soils and modeled atmosp

120 Here we use a new geo-referenced database of radiocarbon-dated evidence to show that mammoths were ab

121 Radiocarbon-dated fossils show that late Quaternary loss

122 rate fossils from peat on the talus cone are radiocarbon-dated from approximately 4,200 to 1,000 cal

123 assemblage overlaps with the latest directly radiocarbon-dated Neanderthal remains, suggesting that N

124 sibericum, was isolated from a >30,000-y-old radiocarbon-dated sample when we initiated a survey of t

125 l time-series analysis of a high-resolution, radiocarbon-dated sequence of 22 faunas spanning the Hol

126 adiogenic isotope ratios of strontium for 84 radiocarbon-dated skeletons from seven archaeological si

127 al formed during or after this period may be radiocarbon-dated using the abrupt rise and steady fall

128 sediments retained within seven out of nine, radiocarbon-dated, Late Pleistocene mammoth (Mammuthus p

129 Here, we use radiocarbon dates and ancient mitochondrial DNA from lat

130 tie-points allows direct comparison between radiocarbon dates and Greenland climate records.

131 Accelerator mass spectrometer radiocarbon dates and reanalysis of archaeobotanical ass

132 t statistical analyses of large ensembles of radiocarbon dates are robust and valuable for quantitati

133 Based on new radiocarbon dates as well as reanalysis of the stratigra

134 t is exposing intact plant communities whose radiocarbon dates demonstrate entombment during the Litt

135 An analysis of 1516 radiocarbon dates demonstrates that the development of t

136 s of spacings and frequency distributions of radiocarbon dates for each region support the idea that

137 Radiocarbon dates for the ancient drawings in the Chauve

138 Radiocarbon dates for the earliest stratigraphic layers

139 y them to a new, extensive dataset of 14,535 radiocarbon dates for the Mesolithic and Neolithic perio

140 Forty-eight radiocarbon dates from 43 residential features indicate

141 All bat radiocarbon dates from Abaco (Bahamas) that represent ex

142 son with summed probability distributions of radiocarbon dates from archaeological sites indicate tha

143 /- 3300 to 29,400 +/- 2300 BP, and three AMS radiocarbon dates from charcoal samples belonging to the

144 Bayesian statistical analysis of radiocarbon dates from residential features in the core

145 ena, Easter Island, and analysis of previous radiocarbon dates imply that the island was colonized la

146 Radiocarbon dates indicate that peat began accumulating

147 A series of radiocarbon dates indicate that the precinct's different

148 Our accelerator mass spectrometry radiocarbon dates of 14 individual charcoal particles ar

149 associated with the writing have calibrated radiocarbon dates of 200 to 300 B.C.

150 We combined novel radiocarbon dates of bat fossils with time-scaled ecolog

151 r terrace near Fort McMurray with calibrated radiocarbon dates of over 11,500 years ago.

152 latest chronology for the site, based on AMS radiocarbon dates of shell ornaments, suggests that the

153 Remarkably agreeing with the radiocarbon dates of the human and animal occupancy, thi

154 Though radiocarbon dates on archaeological remains such as char

155 Radiocarbon dates on charcoal are consistent with a mid-

156 gy based on 26 accelerator mass spectrometry radiocarbon dates on ostrich eggshells indicates an age

157 To that end, we compiled lists of direct radiocarbon dates on paleontological specimens of extinc

158 Here, we report 88 radiocarbon dates on the botanical remains from El Gigan

159 Here we report a series of AMS radiocarbon dates on the marine gastropod Phorcus turbin

160 Nineteen radiocarbon dates on these deposits from four separate d

161 rt a series of accelerator mass spectrometry radiocarbon dates on ultrafiltered bone collagen extract

162 Radiocarbon dates on wetland plants exposed along its re

163 The new radiocarbon dates push back by 2 centuries the accepted

164 orous pretreatment protocols have been used, radiocarbon dates should be assumed to be inaccurate unt

165 More than 100 high-precision radiocarbon dates show that deposits containing artifact

166 47 archaeological sites and 5,464 calibrated radiocarbon dates spanning fourteen thousand to two thou

167 sed on cold argon and oxygen plasmas permits radiocarbon dates to be obtained on paintings that conta

168 Here I add many new radiocarbon dates to those already published on late Ple

169 The radiocarbon dates were calibrated using a Bayesian stati

170 ever, two-thirds of dates from the south are radiocarbon dates, a technique that is particularly sens

171 In the absence of radiocarbon dates, bat extinctions had been presumed to

172 , and stone tool residues, combined with 126 radiocarbon dates, demonstrate that maize was widely gro

173 They include 259 radiocarbon dates, mainly related to the rock art and hu

174 We obtained radiocarbon dates, pollen, macrofossils and metagenomic

175 In their recent reanalysis of Clovis-age radiocarbon dates, Waters and Stafford report that they

176 Using a regional database of n = 523 radiocarbon dates, we find a significant drop in relativ

177 Sample age was estimated by interpolating 40 radiocarbon dates.

178 recocity would be proven by stratigraphy and radiocarbon dates.

179 Measurements included radiocarbon dating (to determine peat accumulation rates

180 ntial alternative to the use of charcoal for radiocarbon dating analyses.

181 oring possible applications in the fields of radiocarbon dating and atmospheric monitoring.

182 Direct accelerator mass spectometry radiocarbon dating and Bayesian modeling confirm that th

183 Radiocarbon dating and DNA analysis show that the rib is

184 e damage of collagen, and screen samples for radiocarbon dating and DNA analysis.

185 s morphometrics, taphonomy, stable isotopes, radiocarbon dating and genetic analyses.

186 servations of Siberian permafrost exposures, radiocarbon dating and spatial analyses to quantify Holo

187 te change at the last glacial termination by radiocarbon dating benthic and planktonic foraminiferal

188 The conventional approach of radiocarbon dating bulk organic carbon in lake sediments

189 Archaeological, osteological and radiocarbon dating data were consistent with these being

190 Recent excavations and high-precision radiocarbon dating from the largest Iron Age (IA, ca. 12

191 Radiocarbon dating has been fundamental to the study of

192 locene epoch and previous attempts at direct radiocarbon dating have failed.

193 Direct radiocarbon dating indicated that these plants grew betw

194 Radiocarbon dating indicates that 30 to 50% of the carbo

195 Radiocarbon dating indicates that the three burial event

196 Therefore, radiocarbon dating is ideally performed on organic compo

197 arbon in various fields, and it implies that radiocarbon dating may no longer provide definitive ages

198 he accuracy of accelerator mass spectrometry radiocarbon dating of 29 herbivore and plant tissues col

199 biochemistry (delta(13)C and delta(15)N) and radiocarbon dating of ancient human and animal bone docu

200 Radiocarbon dating of both individuals (A120 to 533 AD [

201 Radiocarbon dating of eye lens nuclei from 28 female Gre

202 face waters in a boreal peat catchment using radiocarbon dating of particulate and dissolved organic

203 his C loss was from soil organic matter, and radiocarbon dating of residual soil layers revealed that

204 nt (kyr B.P.) has limited the application of radiocarbon dating of samples from the Last Glacial peri

205 To overcome this problem, a radiocarbon dating protocol has been developed to date e

206 Subsequent radiocarbon dating revealed the bone to be >50,000 years

207 wo recent developments in the methodology of radiocarbon dating show that the speed of colonization o

208 Accelerator mass spectrometry (AMS) radiocarbon dating showed fruits to be 31,800 +/- 300 y

209 Much as radiocarbon dating that half a century ago moved archaeo

210 ninvasive procedure presented here relies on radiocarbon dating the so-called angel's share: the trac

211 Here, by radiocarbon dating various terrestrial OC components in

212 through changes in DOC concentration alone: Radiocarbon dating was essential to show that leaching o

213 We sampled 281 moa individuals and combined radiocarbon dating with ancient DNA analyses to help res

214 everal cranial fragments from the site using radiocarbon dating, ancient DNA, ZooMS and isotope analy

215 c and geomorphic data, physical volcanology, radiocarbon dating, tephra geochemistry, and chronicles,

216 ration to purify faunal bone collagen before radiocarbon dating, we obtain ages at least 10 ka (14)C

217 ving patterns, dyes/mordant, style, and even radiocarbon dating.

218 One means of testing this is by radiocarbon dating; however, until recently, our ability

219 pools in tailings sediment were essentially "radiocarbon dead" (i.e., Delta(14)C ~ -1000 per thousand

220 UCM to these environments, natural abundance radiocarbon (Delta(14)C) and stable carbon (delta(13)C)

221 Compound-specific stable (delta(13)C) and radiocarbon (Delta(14)C) isotopes of phospholipid fatty

222 p Pacific Ocean that could have released its radiocarbon-depleted carbon stock to the atmosphere duri

223 ean is most likely the primary source of the radiocarbon-depleted CO2 released to the atmosphere duri

224 onstructed from deep-sea corals, which shows radiocarbon-depleted waters during the glacial period an

225 The timing of intermediate-water radiocarbon depletion closely matches that of atmospheri

226 IntraCavity OptoGalvanic Spectroscopy as a radiocarbon detection technique was first reported by th

227 This technique for radiocarbon detection was presented with tremendous pote

228 Galvanic Spectroscopy setup at Groningen for radiocarbon detection.

229 rbon-containing components that would affect radiocarbon determinations at the precisions achievable

230 In addition, accelerator mass spectrometry radiocarbon determinations carried out directly on diffe

231 The radiocarbon determinations, stratigraphic integrity of X

232 re we use a global array of ocean-atmosphere radiocarbon disequilibrium estimates to demonstrate a ap

233 he chronological improvements enabled by the radiocarbon "earthworm clock" thus strongly enhance our

234 e deglaciation is marked by switches between radiocarbon-enriched and -depleted waters, leading to la

235 We interpret these radiocarbon-enriched signals to represent two short-live

236 Here, we present radiocarbon evidence from the Atlantic sector of the Sou

237 Radiocarbon evidence rules out seawater bicarbonate as t

238 However, radiocarbon fingerprinting here clearly indicates that l

239 iched and -depleted waters, leading to large radiocarbon gradients in the water column.

240 Here we use the natural distribution of radiocarbon in archaeal membrane lipids to quantify the

241 Radiocarbon in the atmosphere is regulated largely by oc

242 gnized implications for many applications of radiocarbon in various fields, and it implies that radio

243 of deoxycytidine kinase had little effect on radiocarbon incorporation in DNA, which is in contrast t

244 Radiocarbon incorporation into DNA and RNA was abrogated

245 re, we present concentration, and stable and radiocarbon isotope, data from hydrocarbons dissolved in

246 ovided precise quantitation of the resulting radiocarbon-labeled species.

247 The radiocarbon level of ambient PAHs was higher in winter t

248 small offset (19 radiocarbon years older) in radiocarbon levels in the Nile Valley is probably a grow

249 he coke plant fenceline samples had very low radiocarbon levels.

250 tween global atmospheric and regional marine radiocarbon levels.

251 A radiocarbon mass balance quantified a predominantly natu

252 Archaeological bones are usually dated by radiocarbon measurement of extracted collagen.

253 This setup allows direct radiocarbon measurements for over 70 samples daily by AM

254 We used 211 radiocarbon measurements made on samples from short-live

255 We present direct radiocarbon measurements of OC respired by bacteria in f

256 we utilize molecular-level natural-abundance radiocarbon measurements on an amalgamated sediment reco

257 Natural abundance radiocarbon measurements on surface sediment organic mat

258 The radiocarbon measurements seem to provide the earliest se

259 hat the method is unsuited for ambient level radiocarbon measurements, and even highly enriched CO2 s

260 but must be used with caution for precision radiocarbon measurements.

261 s older, close to or beyond the limit of the radiocarbon method for the Mousterian at Jarama VI and N

262 ndered reliable dating of the period, as the radiocarbon method reaches its limit at approximately 50

263 In this work we present specific radiocarbon radioactivity determinations and based on th

264 We use water-column radiocarbon reconstructions to examine changes in northe

265 We present a 25,000-year-long Southern Ocean radiocarbon record reconstructed from deep-sea corals, w

266 Statistical analysis of the radiocarbon record shows that transitioning farming soci

267 e-delayed wave-of-advance models, we use the radiocarbon record to test several alternative colonizat

268 ulation based on statistical analysis of the radiocarbon record.

269 hern Ocean, we show that existing deep-ocean radiocarbon records from the glacial period are sufficie

270 Here we present radiocarbon records of surface and intermediate-depth wa

271 tarted developing this technique for various radiocarbon related applications.

272 e the time-constrained high-resolution local radiocarbon reservoir age offset derived from an absolut

273 Our radiocarbon results are inconsistent with the admixture

274 Stratified radiocarbon samples and artifacts were recorded with pre

275 ains of a palace complex dated by associated radiocarbon samples and ceramics to the Late Formative p

276 The outstanding radiocarbon sensitivity of accelerator mass spectrometry

277 Two major deglacial radiocarbon shifts occurred in phase with centennial atm

278 The atmospheric decrease in the radiocarbon signal coincides with regionally intensified

279 in magnitude the decrease in the atmospheric radiocarbon signal during the early stages of the glacia

280 Here, we evaluate the quantity and radiocarbon signature of C(ex) added from two sources: p

281 l Gyre was examined by exploiting the unique radiocarbon signatures (Delta(14)C) of the 3 major carbo

282 technical refinement extends the utility of radiocarbon simulation methods and can provide a rigorou

283 We combine measurements of radiocarbon, stable carbon isotopes and element ratios t

284 aleolithic contexts were previously dated by radiocarbon to less than 42 ka calBP.

285 We used natural abundance radiocarbon to partition ecosystem respiration into auto

286 rovide a comprehensive record of terrestrial radiocarbon to the present limit of the (14)C method.

287 chemistry+PCGC) agree, both in magnitude and radiocarbon value (1.1 +/- 0.5 microg of C, fraction mod

288 r, and use an average background or prespill radiocarbon value for sedimentary organic carbon that pr

289 in deep DOC concentration and the anomalous radiocarbon values of DOC in the Southern Ocean.

290 changes in AM circulation by reconstructing radiocarbon ventilation ages of the deep Nordic Seas ove

291 resent a record of North Atlantic deep-water radiocarbon ventilation, which we compare with similar d

292 t, CO2 samples containing elevated levels of radiocarbon were prepared in-house and experimented with

293 nera securely fall between 12,000 and 10,000 radiocarbon years ago (approximately 13,800-11,400 calen

294 chronous event that took place 12,000-10,000 radiocarbon years B.P.

295 rn Europe, dating to < or =48,000 calibrated radiocarbon years before present (cal BP).

296 By around 15 to 14 thousand calibrated radiocarbon years before present (cal. kyr bp), glacial

297 nsis holotype (LB1), ~18 thousand calibrated radiocarbon years before present (kyr cal. BP), or the t

298 e Americas, dating between 11,500 and 10,900 radiocarbon years before the present (14C yr B.P.).

299 A small offset (19 radiocarbon years older) in radiocarbon levels in the Ni

300 s cooling episode 10,900 B.P. to 9,800 B.P. (radiocarbon years).