ライフサイエンスコーパス: uranium

1 r for total evaporation TIMS measurements of uranium.

2 mately 10(-10 236)U concentration in natural uranium.

3 an aqueous solution containing low enriched uranium.

4 osure to geogenic contaminants, for example, uranium.

5 effect on the partitioning or speciation of uranium.

6 o contact with geological formations high in uranium.

7 story, the continental crust was enriched in uranium.

8 butes substantially to the immobilization of uranium.

9 ution of the upper mantle with this recycled uranium.

10 monstrate a useful yield of 24% for metallic uranium.

11 an aqueous solution containing low enriched uranium.

12 s radioactive gas produced from the decay of uranium ((238)U), which is ubiquitous in rocks and soils

13 Uranium accumulated only in areas where organic carbon a

14 BW30) membranes to establish the behavior of uranium across pH (3-10) and pressure (5-15 bar) ranges.

15 nges of performing reliable and reproducible uranium adsorption studies are also discussed, as well a

16 d to other mass spectrometry techniques, but uranium analysis shows strong matrix effects arising fro

17 - and threefold bonding interactions between uranium and arsenic in parent arsenide [U-AsH2], termina

18 water-stable anionic mesoporous MOF based on uranium and featuring tbo-type topology.

19 Determining key reaction pathways involving uranium and iron oxyhydroxides under oxic and anoxic con

20 itals are active in the chemical bonding for uranium and neptunium, shown by significant variations i

21 dia but were able to extensively precipitate uranium and phosphorus-containing minerals on hyphal sur

22 Weapons-grade uranium and plutonium could be used as nuclear explosive

23 fficient separation processes for recovering uranium and plutonium from spent nuclear fuel are essent

24 havior between Np and its closest neighbors, uranium and plutonium, are found.

25 Using the uranium and thorium amides U[N(SiMe3)2]3 and [(Me3Si)2N]

26 Here we report tetravalent cerium, uranium and thorium bis(carbene) complexes with trans C=

27 natural radioactivity, reveal the amount of uranium and thorium in the Earth and set limits on the r

28 move the heat-producing elements--potassium, uranium and thorium--such removal would make it extremel

29 r electron acceptors such as iron oxides and uranium and to wire electroactive biofilms, but the cont

30 t the nitride group is multiply bound to two uranium and two or three Cs+ cations, these complexes tr

31 Technetium, uranium, and neptunium are contaminants that cause conce

32 stabilization gained by dimerization through uranium-arene bonds.

33 y increasing the number of multiple bonds to uranium, as demonstrated by a family of uranium(VI) dian

34 adsorbent shows very high selectivity toward uranium, as well as thorium, in competition with various

35 d to investigate the immobilization of trace uranium associated with nanophase iron (oxyhydr)oxides,

36 plied to crystalline and liquid aluminum and uranium at different temperatures and densities, and sho

37 Samples having uranium atom percent (at%) from 0 to 100 in (U,Th)O2 wer

38 over the length of the filament, unlike the uranium atomic and ionic emission, for which the signal-

39 complexation and removal of oxidized surface uranium atoms by carbonate.

40 The useful yield for uranium atoms from a uranium dioxide matrix is 0.4% and

41 We report a structurally complex, mesoporous uranium-based metal-organic framework (MOF) made from si

42 Most importantly, however, this new uranium-based MOF is water-stable and able to absorb pos

43 h conditions is needed to predict subsurface uranium behavior and optimize the selection and performa

44 emulsified vegetable oil (EVO) amendment for uranium bioremediation.

45 ly sensitive real-time standoff detection of uranium by the use of femtosecond filament-induced laser

46 Dissolved uranium, calcium, and phosphate concentrations with satu

47 When dissolved uranium, calcium, and phosphate were added simultaneousl

48 to subsurface environments contaminated with uranium can be used as an in situ remediation approach.

49 ormed reversibly by f-block metals, and that uranium can thus mimic elementary transition metal react

50 s uniquely stabilized by backbonding between uranium cations and the eta(5)-pyridyl ring.

51 as quantum chemical, characterization of the uranium-centered clusters [U@Bi12](3-), [U@Tl2Bi11](3-),

52 taneously with (235,238)U(16)O2 species in a uranium certified reference material.

53 Prior to the year 2000, non-aqueous uranium chemistry mainly involved metallocene and classi

54 Uranium commonly exists in aqueous solutions in the form

55 nic structures of a series of highly reduced uranium complexes bearing the redox-active pyridine(diim

56 The uranium complexes have been characterized via multinucle

57 alcoholic substrate and the first example of uranium complexes showing catalytic reactivity with alco

58 here is burgeoning interest in the nature of uranium complexes with soft- and multiple-bond-donor lig

59 rasting to majority 5f-orbital character for uranium, computational analyses suggests that the bondin

60 No difference was observed in the uranium concentration between the two groups.

61 s are seen as the key to controlling aqueous uranium concentrations (cU(aq)).

62 cU(aq) up to 75 mug L(-1) but low background uranium concentrations (median cU(aq) < 0.5 mug L(-1)).

63 The main NRZ body exhibited uranium concentrations up to 100 mg/kg U as U(IV) and co

64 ption was the dominant removal mechanism for uranium contacted with preformed amorphous calcium phosp

65 Both organisms showed reduced growth on uranium-containing media but were able to extensively pr

66 NRZs, known to exist in other uranium-contaminated aquifers, may be regionally importa

67 has been proposed as a strategy to remediate uranium-contaminated groundwater in situ.

68 work has implications for the stewardship of uranium-contaminated groundwater, with the formation of

69 ial to be an effective remediation agent for uranium-contaminated subsurface environments, however, t

70 Uranium contamination of surface environments is a probl

71 three certified reference materials (CRM) of uranium, CRM U030a, CRM U500, and CRM U850.

72 is fixed at 7.4 thousand years (thorium-230/uranium dating), with a maximum age between 8.20 and 12

73 ure of uranium(III), and the availability of uranium delta-symmetry 5f orbitals.

74 The uranium deposit exhibited mostly (238)U-enriched isotope

75 Uranium determinations from the TXRF spectra of such spe

76 he total energy is proposed.The nuclear fuel uranium dioxide is of intrinsic interest due to its indu

77 The useful yield for uranium atoms from a uranium dioxide matrix is 0.4% and rises to 2% when the

78 Here we show that single crystals of uranium dioxide subjected to strong magnetic fields alon

79 g a robust magneto-elastic memory that makes uranium dioxide the hardest piezomagnet known.

80 der diffraction and tomography measurements, uranium dioxide was determined the dominant corrosion pr

81 The thermal and magnetic properties of uranium dioxide, a prime nuclear fuel and thoroughly stu

82 Hundreds of tons of depleted uranium (DU) ammunition were used in previous armed conf

83 Uranium encapsulated in grout was exposed to water vapou

84 ising for in-field, standoff measurements of uranium enrichment for nuclear safety and security.

85 More than 1000x uranium exists in the oceans than exists in terrestrial

86 are related to each other and to what extent uranium f-electron valence fluctuations influence each o

87 faces at structural uranium sites, impacting uranium fate.

88 loped for the selective recovery of seawater uranium for more than six decades, with a renewed intere

89 ation of residual plutonium in the separated uranium fraction was achieved directly on the filament b

90 y of an attached S. natans biofilm to remove uranium from solution without any filtration step.

91 Here, we present a record of redox-sensitive uranium from the central equatorial Pacific Ocean to ide

92 d in organic carbon and sulfides, as well as uranium, from previous milling operations.

93 Uranium groundwater contamination due to U mining and pr

94 (NRZs) coincide spatially with a persistent uranium groundwater plume.

95 Heterobimetallic complexes containing short uranium-group 10 metal bonds have been prepared from mon

96 The effective nuclear charge at uranium has been probed using X-ray absorption spectrosc

97 tion and characterization of highly enriched uranium (HEU) presents a large challenge in the non-prol

98 ly, a very thin (~5 nm) interfacial layer of uranium hydride was observed at the oxide-metal interfac

99 Quantum chemical calculations on the 5f(3) uranium(III) complex suggest the presence of a U=C donor

100 es sterically and electronically unsaturated uranium(III) complexes to afford a uranium(V)-imido comp

101 interactions) in molecular thorium(III) and uranium(III) species and therefore the extent of covalen

102 e)1.5 led to the formation of the homoleptic uranium(III) tris(aryl) complex (Terph)3U (1).

103 pentadienyl, the strongly reducing nature of uranium(III), and the availability of uranium delta-symm

104 carbon, nitrogen, oxygen, iron, sulfur, and uranium in a shallow floodplain.

105 ions produced from the mining and milling of uranium in Canada.

106 from 0 to 100 in (U,Th)O2 were analyzed for uranium in comparison to thorium.

107 rategy for maintaining low concentrations of uranium in groundwater over long time periods.

108 een used to determine the oxidation state of uranium in mixed-valent U3O8 and U3O7 uranium oxides.

109 urrently produced by irradiation of enriched uranium in nuclear reactors.

110 Elemental and isotope systematics of uranium in OIBs are strikingly consistent with previous

111 mple of a uranium nitride complex containing uranium in the +III oxidation state.

112 Uranium in the SRS wetland sediments existed primarily a

113 riggered roll-front mobilization of geogenic uranium in the studied aquifers which are unaffected by

114 rt a proposed mechanism for the oxidation of uranium in water vapour environments where the transport

115 Biogeochemistry of uranium in wetlands plays important roles in U immobiliz

116 a sensitive real-time monitor of toxicity of uranium (in the U(VI) oxidation state) in a plant cell m

117 oped from 2000-2016 for recovery of seawater uranium, in particular including recent developments in

118 eys contemporary ligand classes installed at uranium, including alkyl, aryl, arene, carbene, amide, i

119 anium plasma generated at different filament-uranium interaction points.

120 actinyl dioxo cations can be extended beyond uranium into the transuranic elements is presented.

121 Elevated uranium ion formation by passive heating during rhenium

122 Because uranium is a common element in the Earth's crust and a w

123 Uranium is an important carbon-free fuel source and envi

124 Understanding the corrosion of uranium is important for its safe, long-term storage.

125 We show that the subducted flux of uranium is isotopically distinct, with high (238)U/(235)

126 Uranium isotopes ((238)U/(235)U) have been utilized to t

127 ments for standoff detection and analysis of uranium isotopes and indicate the potential of the techn

128 on isotopes determined by ion microprobe and uranium isotopes and U-Th dating by laser ablation induc

129 equent measurement of the amount contents of uranium isotopes by total evaporation (TE) TIMS with a d

130 We demonstrate measurement of uranium isotopes in femtosecond laser ablation plumes us

131 In contrast, the uranium isotopic composition of MORB requires the convec

132 rgued to contain a recycled component, their uranium isotopic compositions do not differ from those o

133 tion of biological processes responsible for uranium isotopic fractionation and link them to potentia

134 combined instrument was used to measure the uranium isotopic ratios in particles of three certified

135 try of 1 was also explored, which led to the uranium(IV) alkoxide complex U(OCPh3)4(DME) (3.DME).

136 ggest that all members of the series contain uranium(IV) centers with 5f(2) configurations and reduce

137 ide and diazene activation by highly reduced uranium(IV) complexes bearing trianionic redox-active py

138 he nitride group to CS2 to afford SCN(-) and uranium(IV) disulfide.

139 Uranium(IV) is sparingly soluble, but may be mobilized u

140 line N-oxide to trianionic pyridine(diimine) uranium(IV) precursors, Cp*U((Mes)PDI(Me))(THF) (1), Cp*

141 ometric reaction at room temperature to form uranium(IV) siloxides.

142 Uranium(IV) speciation controls its reactivity, particul

143 esults in direct conversion of the uranyl to uranium(IV) tetrachloride.

144 Here, we report molecular uranium(IV)-arsenic complexes featuring formal single, d

145 quadrupolar and dipolar contributions in the uranium L3-edge X-ray absorption cross section to provid

146 nt a compilation of ~120,000 detrital zircon uranium-lead (U-Pb) ages from global sedimentary deposit

147 Here we apply uranium-lead (U-Pb) zircon geochronology to Deccan rocks

148 Much of the existing chronology based on uranium-lead dating and palaeomagnetic stratigraphy has

149 Uranium-lead geochronology in detrital zircons and prove

150 ing of the nature and extent of covalency in uranium-ligand bonding, and the benefits that this may h

151 Despite a major expansion of uranium-ligand multiple bond chemistry in recent years,

152 Despite the burgeoning field of uranium-ligand multiple bonds, analogous complexes invol

153 Uranium LIII-edge EXAFS analysis reveals that the adsorb

154 nanoparticles coprecipitated with U(VI) for uranium loadings varying from 1000 to 10000 ppm are inve

155 late the entire adsorption data set over all uranium loadings, pH values, and dissolved inorganic car

156 In this method, a uranium material was chemically purified from its thoriu

157 hydrolysis separation of Mo as MoO4(2-) from uranium materials and its subsequent determination using

158 ecord through the reductive precipitation of uranium may provide the sought-after tool to probe for b

159 esults showed that important determinants of uranium-membrane sorption interactions were (i) the uran

160 Uranium metal corrodes rapidly in air, but the exact mec

161 Diffusion kinetics obtained from the uranium metal indicate that He is quantitatively retaine

162 )U and (238)U in natural and highly enriched uranium metal samples.

163 The data show a trend in uranium-metal bond strength that decreases from 3-Ni dow

164 runae, originally isolated from an abandoned uranium mine, ceased to grow, and concomitantly exhibite

165 e study includes data from 2006-2013 for two uranium mine-mill operations in northern Saskatchewan (S

166 e assessed in a case-control study of former uranium miners (242 cases and 336 controls).

167 r variant was associated with lung cancer in uranium miners and never smokers in two external study p

168 tality associations in a study of 4,124 male uranium miners from the Colorado Plateau who were follow

169 er are associated with lung cancer in former uranium miners with high occupational exposure to radon

170 , and lung squamous cell carcinoma in former uranium miners.

171 jor lung cancer histology observed in former uranium miners.

172 This results in Canadian uranium mining-milling contributing only 1.1 g CO2e/kWh

173 ic conditions is essential for understanding uranium mobility as well as other iron oxyhydroxide medi

174 inate the role of the 5f valence orbitals of uranium, neptunium and plutonium in chemical bonding usi

175 tentials and total concentrations of aqueous uranium, nitrate, and sulfate species in groundwater tog

176 Uranium nitride (UN) is one of the most studied actinide

177 u)3)3}2(mu-N)]affords the first example of a uranium nitride complex containing uranium in the +III o

178 Complexes with up to three uranium-nitrogen double bonds are now being widely studi

179 173.3-angstrom cubic unit cell enclosing 816 uranium nodes and 816 organic linkers-the largest unit c

180 The structure comprises 10 uranium nodes and seven tricarboxylate ligands (both cry

181 Uranium on the roots were both U(IV) and U(VI), which we

182 eference materials (GRMs), uranium ores, and uranium ore concentrates (UOC) prior to the analysis of

183 hat biogenic processes are more important to uranium ore genesis than previously understood.

184 s of geochemical reference materials (GRMs), uranium ores, and uranium ore concentrates (UOC) prior t

185 We report here a photoluminescent uranium organic framework, whose photoluminescence inten

186 that can be stabilized within the conjugated uranium oxalate-carboxylate sheet.

187 demonstrate rapid isotopic analysis of solid uranium oxide at a precision of <0.5% relative standard

188 rent rates of increase of plasma density and uranium oxide density along the filament length resultin

189 The resulting uranium oxide emis-sion exhibits a nearly constant signa

190 The presence of schoepite phases in older uranium oxide material is likely indicative of storage u

191 A uranium oxide molecular emission isotope shift of 0.05 +

192 eld from the oxide is almost entirely due to uranium oxide molecules reducing the neutral atom conten

193 Chemical signatures correlated with uranium oxide processing are of interest to forensic sci

194 igh-purity alpha-U3O8 sample and three other uranium oxide samples synthesized from reaction routes u

195 ites, were initially detectable in the other uranium oxide samples.

196 a more rapid characterization of interdicted uranium oxide samples.

197 We quantify the reduction of uranium oxide surface layers by Ar(+) and Ga(+) sputteri

198 on of micrometer-sized particles composed of uranium oxide using aerosol spray pyrolysis is character

199 ate of uranium in mixed-valent U3O8 and U3O7 uranium oxides.

200 Additional equivalents result in full uranium-oxo bond scission and formation of UI4(1,4-dioxa

201 laser ablation-MC-ICPMS of micrometer sized uranium particles (1-3.5 mum).

202 ogy was successfully applied to a mixture of uranium particles coming from certified reference materi

203 ted aquifers, may be regionally important to uranium persistence.

204 under anaerobic conditions to assess whether uranium phosphate precipitation was a viable bioremediat

205 pounds 4 and 7 are unprecedented examples of uranium phosphido complexes outside of matrix isolation

206 pose in solution underscoring the paucity of uranium phosphido complexes.

207 iagnostics to characterize the properties of uranium plasma generated at different filament-uranium i

208 sensitivity to uranium were selected in the uranium population.

209 Formation of nanosize uranium precipitates on the magnetite surface at reducin

210 i were investigated for phosphatase-mediated uranium precipitation during growth on an organic phosph

211 Uranium precipitation with phosphate does not induce iso

212 as a highly sensitive indicator for residual uranium present in the sample, which is not of radiogeni

213 en (Ptrend < 0.01), and 1.46 (1.09-1.96) for uranium (Ptrend = 0.02).

214 atrices as well as widely varying amounts of uranium radioisotopes content.

215 Uranium redox states and speciation in magnetite nanopar

216 The contributions of the three different uranium redox states are quantified with the iterative t

217 stinguishable from that generated by abiotic uranium reduction in laboratory experiments.

218 There is concern that uranium release from NRZs is contributing to plume persi

219 osinus species may have played a key role in uranium removal in these experiments.

220 years ago, the aqueous mobility of oxidized uranium resulted in its significant transport to the oce

221 importance of sulfate-reducing conditions to uranium retention and the essential role of organic matt

222 ical genome sequence but not isolated from a uranium-rich biotope, showed no evidence of dormancy whe

223 This redox shift controls the uranium roll-front mobilization and results in high cU(a

224 reduced U species formed in low-temperature uranium roll-front ore deposits.

225 cs obtained from a metallic, highly enriched uranium sample.

226 MIL-101(Cr) was investigated as a potential uranium scavenger.

227 Support is obtained through the recalculated uranium series with electron spin resonance date of 286

228 urrent deposits, in combination with coupled uranium-series and electron spin resonance dating of fos

229 aring sediments and speleothems, and coupled uranium-series and electron spin resonance dating of mam

230 Uranium-series dating of stalagmite regrowths on the str

231 ntinental weathering and is vital for marine uranium-series geochronology.

232 Luminescence and uranium-series techniques applied to bone-bearing sedime

233 The M. prunae transcriptome during 'uranium-shock' implicated VapC toxins as possible causat

234 strongly to uraninite surfaces at structural uranium sites, impacting uranium fate.

235 al and diagonal reflection symmetries at the uranium sites, resulting in crystal field states with di

236 sis of the magnetite electrodes polarized in uranium solutions at voltages from -0.1 to -0.9 V (E(0)(

237 cessary, adjust those parameters controlling uranium sorption.

238 -membrane sorption interactions were (i) the uranium speciation (uranium species valence and size in

239 s a powerful tool for identifying hexavalent uranium speciation in situ; however, there is no straigh

240 emical modelling confirmed the complexity of uranium speciation, and the presence of meta-ankoleite,

241 user-friendly, straightforward approach for uranium species identification using Raman spectroscopy.

242 re developed that allow accurate and routine uranium species identification.

243 nteractions were (i) the uranium speciation (uranium species valence and size in relation to membrane

244 surface microstructure of metallic depleted uranium specimens following polishing and exposure to mo

245 ns for post-transcriptional regulation under uranium stress to enter a cellular dormant state, thereb

246 dition, the sulfur-rich core would partition uranium strongly and thorium slightly, supplying a subst

247 ruptly exposed to toxic levels of hexavalent uranium, the extremely thermoacidophilic archaeon Metall

248 as iron oxyhydroxide mediated scavenging of uranium, the sorption or coprecipitation of U(VI) with p

249 ring radioactive materials (NORM), including uranium, thorium, actinium, radium, lead, bismuth, and p

250 rithmetic mean +/- 2 standard deviations) by uranium-thorium dating, that sheds light on this crucial

251 Here, we report radiocarbon data from uranium-thorium-dated deep-sea corals in the Equatorial

252 extend the Chinese record to cover the full uranium/thorium dating range, that is, the past 640,000

253 r results are based on a decadally resolved, uranium/thorium-dated, oxygen isotopic record for much o

254 requires the convective stirring of recycled uranium throughout the upper mantle within the past 600

255 matrix effects arising from the tendency of uranium to form strongly bound oxide molecules that do n

256 that it is important to monitor sorption of uranium to membranes, which is controlled by pH and conc

257 overall consistent with charge transfer from uranium to the cyclo-P5 unit to give a cyclo-P5 charge s

258 ent with back-bonding-type interactions from uranium to the HAsAsH pi*-orbital.

259 sion, and the uptake through a high-affinity uranium transport protein involving the modification of

260 ) results in the formation of the hexavalent uranium tris(imido) complex [U(NDIPP)3(thf)3] (1) throug

261 uced via the abiotic reduction of hexavalent uranium (U((VI))) is the dominant reduced U species form

262 blastoma cells incorporated small amounts of uranium (U) after exposure to 10 microM natural U, with

263 The reactive transport of uranium (U) and vanadium(V) from abandoned mine wastes c

264 Uranium (U) contamination occurs as a result of mining a

265 nt state-of-the-art materials for collecting uranium (U) from seawater.

266 lorado River Basin (UCRB) exhibit persistent uranium (U) groundwater contamination plumes originating

267 cedure was developed for preconcentration of uranium (U) in environmental aqueous samples.

268 better the fate and stability of immobilized uranium (U) in wetland sediments, and how intermittent d

269 ssociated with the in situ recovery (ISR) of uranium (U) is the environmental release of soluble, tox

270 We use uranium (U) isotope ratios to detect and quantify the ex

271 gain insights into the risks associated with uranium (U) mining and processing, we investigated the b

272 In situ recovery (ISR) uranium (U) mining mobilizes U in its oxidized hexavalen

273 Despite the well-known toxicity of uranium (U) to bacteria, little is known about how cells

274 iated with microbial reduction of hexavalent uranium (U), i.e., the accumulation of the heavy isotope

275 At pH 4.0 and 6.0 uranium uptake from solution occurred via autunite (Ca(U

276 y between approximately pH 3 and 6; however, uranium uptake increased significantly above approximate

277 he dependence of the extent and mechanism of uranium uptake on the pathway for reaction with calcium

278 Uranium uptake rates follow first order kinetics over a

279 Uranium uptake rates in L. stagnalis ultimately demonstr

280 withN triple bonds, and assemble a family of uranium(V) nitrides.

281 Complexes 2-Cp*, 2-Cp(P), and 3-Cp(P) are uranium(V) trans-bis(imido) species supported by neutral

282 saturated uranium(III) complexes to afford a uranium(V)-imido complex in a reaction that satisfies al

283 restricted to high-valent actinyls and a few uranium(V/VI) complexes, it has had limited scope in an

284 in 3-Cp* and 3-(t)Bu by Ag(I) forms cationic uranium(VI) [Cp*U(NTol)2((Mes)PDI(Me))][SbF6] (4-Cp*) an

285 participation in actinide-ligand bonding for uranium(VI) complexes in contrast to those involving tho

286 s to uranium, as demonstrated by a family of uranium(VI) dianions bearing four U-N multiple bonds, [M

287 Uranium(VI) exhibits little adsorption onto sediment min

288 the sensitive electroanalytical detection of uranium(VI) in aqueous solutions.

289 Uranium(VI) interactions with three smectites (one montm

290 anges the electronic structure, generating a uranium(VI) ion with a monoanionic pyridine(diimine) rad

291 imulating the microbial reduction of aqueous uranium(VI) to insoluble U(IV) via electron donor additi

292 Two uranium(VI) uranyl compounds, Cp*UO2((Mes)PDI(Me)) (3) a

293 Uranium was found to be heterogeneously distributed at t

294 um, and phosphate were added simultaneously, uranium was structurally incorporated into a newly forme

295 Molybdenum, antimony, tungsten, and uranium were positively associated with diabetes, even a

296 Molybdenum, antimony, tungsten, and uranium were positively associated with diabetes, even a

297 but with apparently a greater sensitivity to uranium were selected in the uranium population.

298 Unlike the organometallic chemistry of uranium, which has focused strongly on U(III) and has se

299 num, lead, antimony, thallium, tungsten, and uranium with diabetes prevalence.

300 we demonstrate identification and imaging of uranium with this novel technique using a simple yet rob