ライフサイエンスコーパス: thorium

1 erminal phosphorano-stabilized carbenes with thorium.

2 2 were analyzed for uranium in comparison to thorium.

3 thin the crust by alpha-decay of uranium and thorium.

4 that sedimentary ratios of the radionuclides thorium-230 ((230)Th) and protactinium-231 ((231)Pa), wh

5 arbados corals that have identical 231Pa and thorium-230 (230Th) ages indicate that the timing of sea

6 Thorium-230 dates (uncertainty +/- approximately 10 year

7 Coupled radiocarbon and thorium-230 dates from benthic coral species reveal that

8 Winograd and Coplen question the thorium-230 distribution model proposed to explain the a

9 occurring radionuclides protactinium-231 and thorium-230 in the deep Canada Basin and on the adjacent

10 The initial ratio of radium-226 to thorium-230 is largest in the most primitive lavas, whic

11 The thorium-230-dated records reveal that between 75 and 55

12 of the site is fixed at 7.4 thousand years (thorium-230/uranium dating), with a maximum age between

13 The thorium-232 data suggest that offshore advection of part

14 on ratios of actinides (like uranium-238 and thorium-232).

15 oactive materials (NORM), including uranium, thorium, actinium, radium, lead, bismuth, and polonium i

16 )2) into the Th-C bond of the cyclometalated thorium amides [ThN''2(N(SiMe3)(SiMe2CH2))] and K[ThN''(

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

18 oderate to high catalytic activities for the thorium analogues 6-8, among which 8 exhibited the highe

19 Meanwhile, the radioactive element thorium and counterions phosphate and citrate were separ

20 se self-assembled arrays, which are dense in thorium and nitrogen, has also been demonstrated: infini

21 Thorium and potassium are highly concentrated in and aro

22 le heat-producing elements (such as uranium, thorium and potassium) are efficiently scavenged from de

23 The thorium and uranium complexes were obtained in high yiel

24 bonds of 3.0771(5) A and 3.0319(7) A for the thorium and uranium complexes, respectively, were observ

25 The 231Pa-230Th data also constrain the thorium and uranium distribution coefficients for clinop

26 ions of the heat-producing elements uranium, thorium, and potassium.

27 blanket, proposed to explain the eruption of thorium- and titanium-rich lunar mare basalts, plausibly

28 d ThAsTh linkages exhibit polarized-covalent thorium-arsenic multiple bonding interactions, hitherto

29 ic are known; indeed only two complexes with thorium-arsenic single bonds have been structurally auth

30 n=2; M=U, n=0) results in the formation of a thorium aryl complex, [Th(2-C6H4CH2NMe2)4] or a uranium

31 Moreover, surrounding each thorium atom we find the unusual modulations of hybridiz

32 At each thorium atom, an electronic bound state is observed.

33 Kondo-holes created by substituting spinless thorium atoms for magnetic uranium atoms in the heavy-fe

34 Here we present a mesoporous cationic thorium-based MOF (SCU-8) containing channels with a lar

35 re we report tetravalent cerium, uranium and thorium bis(carbene) complexes with trans C=M=C cores wh

36 The bis(NHC)borate-supported thorium-bis(mesitylphosphido) complex (1) undergoes reve

37 We describe a bis(NHC)borate thorium-bpy complex (1) that is capable of reductively c

38 tional analyses suggests that the bonding of thorium can be more nuanced, in terms of 5f- versus 6d-o

39 These complexes feature the shortest thorium-carbon bonds ( approximately 2.30 A) reported to

40 ][BPh4], 5, the first example of a molecular thorium carbonyl isolable at room temperature.

41 This represents a rare example of thorium-catalyzed transformations of an alcoholic substr

42 A negative array between thorium/cerium and neodymium-143/neodymium-144 indicates

43 of chalcogen atoms resulting in a series of thorium chalcogenolate complexes, Th(ECH2SiMe3)(L3) (E =

44 Me2 with [Et3NH][BPh4] produces the cationic thorium complex [(C5Me5)2ThMe][BPh4] that can be treated

45 atalytic Tishchenko reaction mediated by the thorium complex [(Im(Dipp)N)Th{N(SiMe3)2}3] (8), exhibit

46 A new, simple mono(imido) thorium complex and the first bis(imido) thorium complex

47 The thorium complex was structurally characterized by X-ray

48 do) thorium complex and the first bis(imido) thorium complex, K[Th( horizontal lineNAr)N''3] and K2[T

49 The solution-state behavior of the thorium complexes was evaluated using (1)H, (1)H-(1)H CO

50 bond cleavage, whereas the more redox-robust thorium compounds engage in an acid-base/dehydrocoupling

51 Uranium and thorium concentration and isotopic data are also present

52 ma mass spectrometry (MC-ICP-MS) uranium and thorium concentration and isotopic data obtained by isot

53 Knowledge of uranium and thorium concentrations in geological reservoirs relies l

54 of such specimens were made with respect to thorium, considering it as an internal standard.

55 h H2 forms the known (C5Me5)3ThH as the sole thorium-containing product.

56 , primarily because of problems with uranium/thorium coral dating.

57 In the case of the diamagnetic thorium corrole, variable-temperature, DOSY (diffusion-o

58 ere, we report radiocarbon data from uranium-thorium-dated deep-sea corals in the Equatorial Atlantic

59 s are based on a decadally resolved, uranium/thorium-dated, oxygen isotopic record for much of the pa

60 We found, by means of uranium/thorium dating of fossil corals, that sea level during t

61 e investigate this hypothesis, using uranium-thorium dating of the Hulopoe gravel (on Lana'i) and a s

62 the Chinese record to cover the full uranium/thorium dating range, that is, the past 640,000 years.

63 c mean +/- 2 standard deviations) by uranium-thorium dating, that sheds light on this crucial event.

64 um material was chemically purified from its thorium decay product at a well-known time.

65 two organometallic monometallic complexes of thorium diazide have been synthesized and characterized.

66 ]2[Se4] or [K(18-crown-6)]2[Te2] affords the thorium dichalcogenides, [K(18-crown-6)][Th(eta(2)-E2)(N

67 able to delay phagolysosomal fusion, we used thorium dioxide and acid phosphatase to label phagolysos

68 um might be more compatible than uranium and thorium during mantle melting and that high 3He/4He rati

69 Weaker thorium hydride (ThH1(-4)) absorptions were also observe

70 found to provide syntheses of new classes of thorium hydride compounds.

71 he weak hyperfine interactions) in molecular thorium(III) and uranium(III) species and therefore the

72 44 indicates that significant amounts of the thorium in arc rocks are derived from subducted sediment

73 The detection of thorium in halo and globular cluster stars offers a prom

74 lthough perhaps only about 30 percent of the thorium in subducted sediments is returned to the crust

75 ermine average concentrations of uranium and thorium in the continental crust and in the mantle by us

76 ioactivity, reveal the amount of uranium and thorium in the Earth and set limits on the residual prop

77 high selectivity toward uranium, as well as thorium, in competition with various rare earth metals.

78 s of stabilizing polar linkages at the large thorium ion.

79 with stabilising these linkages at the large thorium ion.

80 ThO2, in which thorium is stable only in a tetravalent state, exhibits

81 Although thorium is traditionally considered to have dominant 6d-

82 ctive elements in KREEP, such as uranium and thorium, is generally thought to provide the thermal ene

83 Uranium, but not thorium, is readily mobilized in the fluid.

84 Maintaining the required gradient of thorium isotope (230)Th over 3.6 meters for 1000 years,

85 Uranium-thorium isotope results from island arc volcanic rocks w

86 Thorium(IV) and uranium(IV) macrocycles of Mes2(p-OMePh)

87 f NC-ArF gives the corresponding fluorinated thorium(IV) bis(ketimide) complexes (C5Me5)2Th[-N=C(CH3)

88 ucturally authenticated examples of a parent thorium(IV)-phosphanide (Th-PH2), a terminal thorium(IV)

89 thorium(IV)-phosphanide (Th-PH2), a terminal thorium(IV)-phosphinidene (Th=PH), a parent dithorium(IV

90 VI) complexes in contrast to those involving thorium(IV).

91 monoselenide and monotelluride complexes of thorium, [K(18-crown-6)][Th(E)(NR2)3] (E = Se, 4; E = Te

92 d the separation of (223,224,225)Ra from the thorium matrix was obtained with an overall recovery yie

93 A new thorium monoalkyl complex, Th(CH2SiMe3)(L3) (L = MeC(N(i

94 Thorium monocarbide (ThC) as a potential fuel for next g

95 Thorium monoxide (ThO) produced in the reaction inserts

96 now being widely studied, yet those with one thorium-nitrogen double bond are rare, and those with tw

97 combining the kinematic tracer protactinium/thorium (Pa/Th) with the deep water-mass tracer, epibent

98 Here, we report thorium parent-arsenide (ThAsH2), -arsinidiides (ThAs(H)

99 hout formation of other secondary uranium or thorium phases.

100 thesized, as evidenced by the formation of a thorium phosphide superlattice.

101 is and structural determination of the first thorium phosphinidene complex are reported.

102 ter spectra along with counting rate maps of thorium, potassium, and iron delineate large composition

103 Radioactive decay of uranium and thorium produces 4He, whereas 3He in the Earth's mantle

104 The low average uranium/thorium ratios of bulk crust primarily reflect different

105 ve lavas, which also have the highest barium/thorium ratios, and decreases with increasing magmatic d

106 Uranium/thorium series analysis of speleothems brackets the Plei

107 Recent geochemical studies of uranium-thorium series disequilibrium in rocks from subduction z

108 ch core would partition uranium strongly and thorium slightly, supplying a substantial part of the 'm

109 mplex 6 represents the first alkyl disulfide thorium species and illustrates the ability of 2 to unde

110 commensurate with those indicated by uranium-thorium studies.

111 t-producing elements--potassium, uranium and thorium--such removal would make it extremely difficult

112 n enthalpies found for two related series of thorium (Th)-nitrate molecular compounds obtained by eva

113 tassium (K, 1150 +/- 220 parts per million), thorium (Th, 220 +/- 60 parts per billion), and uranium

114 For thorium, under ambient conditions only a few multiple bo

115 For thorium, under ambient conditions only a few multiple bo

116 terobimetallics has been prepared, featuring thorium, uranium, and cobalt.

117 os with proxies for curium/uranium (that is, thorium/uranium and neodymium/uranium) provides strong e

118 Uranium and thorium within the Earth produce a major portion of terr

119 ched in mantle melts relative to uranium and thorium, yet estimates of helium partitioning in mantle