962 resultados para CE-3
Resumo:
(Ce,Gd,Mn)MgB_5O_(10)X,LaMgB_5O_(10),P2_(1/c)EPR(Ce_(0.2)La_(0.2))MgB_5O_(10),(Gd_(0.7)La_(0.3))MgB_5O_(10),(Mn_(0.05)La_(0.95))MgB_5O_(10),(Ce_(0.2)Mn_(0.05)La_(0.75))MgB_5O_(10),(Gd_(0.95)Mn_(0.05))MgB_5O_(10)(Ce_(0.2)Gd_(0.8))MgB_5O_(10)(Ce_(0.2)Gd_(0.75)Mn_(0.05))MgB_5O_(15)(Ce_(0.2)Gd_(0.75)Mn_(0.05))MgB_5O_(10):Ce~(3+)Mn~(2+),Gd~(3+)Mn~(2+)Ce~(3+)Gd~(3+)Mn~(2+),Ce~(...
Resumo:
Ce:BaAlF_5X -BaAlF_5,,=5.146(?),b=7.191(?),c=19.647(?)Ce~(3+)290nm ,4f-5d 292nm ,306.5nm 324nm Ce~(3+)~2D ~2F_5/2~2F_7/2254nm , Ce_~(3+),351nm494nm , Ce~(3+)324nm ,
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(Nd,Ce) :YAG Nd:YAG ,80%,,, YAG Ce~(3+) Nd~(3+)
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(NH_4)_2HPO_4-Li_2CO_3-MoO_3(PbF_2) RPO_4(R=La~(3+),Ce~(3+),Tb~(3+)), CePO_4 TbPO_4
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REEREEREE31000g/g;CeCe0.007REE1(pH8REEREECe^3+Ce^4+HCO3^-Ce2Ce^3+Ce^4+CeREEREEREE
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Cerium doped yttrium aluminate perovskite YAlO(3) (YAP) powders are pursued as interesting alternatives to bulk crystals for application in scintillating devices. The emissions of these materials in the near-UV and visible spectral regions originate from electric dipole transitions between 4f and 5d energy levels of Ce(3+) and largely depend on the environment occupied by the ion. In search for improved synthesis conditions that can lead to phase pure powders with optimized structural and spectroscopic characteristics, in this work we have employed the polymeric precursor (Pechini) method to prepare crystalline and amorphous YAP:Ce powders doped with 1-10 mol% Ce(3+). Interesting composite materials were also obtained by dispersing some of the YAP:Ce powders in silica xerogels. A comparative structural and spectroscopic study of all the samples was done by XRD, FT-IR, emission, excitation and excited state lifetime measurements. In agreement with previous reports, excitation at 296 nm results in intense emission in the range 315-425 nm with an average decay time of 30 ns. (c) 2010 Elsevier B.V. All rights reserved.
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Cancer is a disease that begins with mutation of critical genes: oncogenes and tumor suppressor genes. Our research on carcinogenic aromatic hydrocarbons indicates that depurinating hydrocarbonDNA adducts generate oncogenic mutations found in mouse skin papillomas (Proc. Natl. Acad. Sci. USA 92:10422, 1995). These mutations arise by mis-replication of unrepaired apurinic sites derived from the loss of depurinating adducts. This relationship led us to postulate that oxidation of the carcinogenic 4-hydroxy catechol estrogens (CE) of estrone (E1) and estradiol (E2) to catechol estrogen-3,4-quinones (CE-3, 4-Q) results in electrophilic intermediates that covalently bind to DNA to form depurinating adducts. The resultant apurinic sites in critical genes can generate mutations that may initiate various human cancers. The noncarcinogenic 2-hydroxy CE are oxidized to CE-2,3-Q and form only stable DNA adducts. As reported here, the CE-3,4-Q were bound to DNA in vitro to form the depurinating adduct 4-OHE1(E2)-1(,)-N7Gua at 59213 mol/mol DNAphosphate whereas the level of stable adducts was 0.1 mol/mol DNAphosphate. In female SpragueDawley rats treated by intramammillary injection of E2-3,4-Q (200 nmol) at four mammary glands, the mammary tissue contained 2.3 mol 4-OHE2-1(,)-N7Gua/molDNAphosphate. When 4-OHE1(E2) were activated by horseradish peroxidase, lactoperoxidase, or cytochrome P450, 87440 mol of 4-OHE1(E2)-1(, )-N7Gua was formed. After treatment with 4-OHE2, rat mammary tissue contained 1.4 mol of adduct/mol DNAphosphate. In each case, the level of stable adducts was negligible. These results, complemented by other data, strongly support the hypothesis that CE-3,4-Q are endogenous tumor initiators.
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Cathaya argyrophylla100%45%3%3Pnmax(CE)3%1(LCP)(LSP)3%6h45%Pnmax(CE)(LCP)(LSP)1 0-40cm50%;;10cm80%;;
Resumo:
With a crystal orientation dependent on the etch rate of Si in KOH-based solution, a base-emitter self-aligned large-area multi-linger configuration power SiGe heterojunction bipolar transistor (HBT) device (with an emitter area of about 880 mu m(2)) is fabricated with 2 mu m double-mesa technology. The maximum dc current gain is 226.1. The collector-emitter junction breakdown voltage BVCEO is 10 V and the collector-base junction breakdown voltage BVCBO is 16 V with collector doping concentration of 1 x 10(17) cm(-3) and thickness of 400 nm. The device exhibited a maximum oscillation frequency f(max) of 35.5 GHz and a cut-off frequency f(T) of 24.9 GHz at a dc bias point of I-C = 70 mA and the voltage between collector and emitter is V-CE = 3 V. Load pull measurements in class-A operation of the SiGe HBT are performed at 1.9 GHz with input power ranging from 0 dBm to 21 dBm. A maximum output power of 29.9 dBm (about 977 mW) is obtained at an input power of 18.5 dBm with a gain of 11.47 dB. Compared to a non-self-aligned SiGe HBT with the same heterostructure and process, f(max) and f(T) are improved by about 83.9% and 38.3%, respectively.
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PSLBaLiF_3Eu~(2+)BaLiF_3Eu~(2+)BaLiF_3Ce~(3+)BaLiF_3Ce~(3+)Eu~(2+)BaLiF_3Tb~(3+)BaLiF_3Ce~(3+)CeF_3Ce~(3+)CeF_3 Li~+CeF_3F~-BaLiF_3Ce~(3+)Eu~(2+)Eu~(3+)Eu~(2+)Eu~(2+)Ce~(3+)Ce~(3+)Eu~(2+)BaLiF_3xBaLiF_3BaLiF_3BaLiF_3xBaLiF_3Eu~(2+)BaLiF_3Tb~(3+)KMgF_3Tb~(3+)
Resumo:
-- ZnSZnS:EuZnS:MnZnS:Mn,EuCeO_2CeO_21(TAA)ZnSXRDTEMSPS(1)ZnSZnSTAAZnS100ZnS(2)100ZnS3.2 nmTEMZnSZnS40 nm(3)TAATAATAAZnSZnS2ZnSZnS:EuZnS:MnZnS:MnEuZnS3ZnS:Mn254 nm365 nm4ZnSZnS5W/OCeO_2(Ce~(3+))(1)CeO_2Ce02500CeO_2CeO_2CeO_2(2)W()Ce~(3+)CeO_2(3)TEMCeO_26CeO_2CeO_2(1)CeO_2/IRCe-OCeO_2Ce-OCeO_2(2)XPSCe3d_(5/2)3d_(3/2)CeO_2CeO_27XPS(1)EuEu~(3+)Eu~(3+)~5D_0 ~7F_J(J = 0l234)~7F_l~7F_2EuEu~(3+)(2)400 nmH_2SEu~(3+)Eu~(2+)Eu~(3+)(3)EuXPSEu~(3+)615 nmEuEu
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Ca_4RO(BO_3)_3(R:)1PbO, PbF_2B_2O_3Gd_2O_3, CaCO_3, H_3BO_3GdCOB2 Ca_4GdO(BO_3)_3: Eu~(3+),Sm~(3+)Ca_4GdO(BO_3)_3Eu~(3+) 611nmGd~(3+)Gd~(3+)-Gd~(3+)Eu~(3+)Sm~(3+)Eu~(3+)3 M_4LnO(BO_3)_3: Dy~(3+)(M=Ca, Sr, Ba;Ln=La, Gd, Y, Yb, Lu)Dy~(3+)Dy~(3+)Ca~(2+)Sr~(2+)Ba~(2+)La~(3+)Gd~(3+)Yb~(3+)Lu~(3+), Dy~(3+)~4F_(9/2)~6H_(13/2)4 Ca_4YO(BO_3)_3:Tb~(3+), Ce~(3+)Tb~(3+)Ce~(3+)Tb~(3+)Ce~(3+)Tb~(3+)
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KMgF_3:Eu~(2+)KMgF_3:Eu~(2+)-X(X=Gd~(3+)Ce~(3+)Cr~(3+)Cu~(+))12UV-Vis300 K77 KEu~(2+)4Eu~(2+) ~6P_(7/2)Eu~(2+)Ce~(3+)d-dKMgF_3:Eu~(2+)
Resumo:
?? ? ? 0CCN~+20 mol20 mol - Eu~(3+)Dy~(3+)(2.O * 1O~(-3)2.0 * l0~(-4)2.0 * 10~(-5)2.0 * 10~(-8) mo1/L)180HH_2O -3Trp-3Trp-158Trp-237Trp-3Trp-158 -Ca~(2+)DNADNADNADNADNADNADNA1Eu~(3+)Dy~(3+)Pr~(3+)Lu~(3+)Ca~(2+)Mg~(2+)DNAP0_2~-2Ni~(2+)Zn~(2+)DNAN7DNAB3Cu~(2+)DNAN7DNADNAB4Ce~(3+)ATDNAATBDNA - 5DNACe~(2+)> Cu~(2+)>Ni~(2+)Zn~(2+)> Eu~(3+)Dy~(3+)Pr~(3+)Lu~(3+)Ca~(2+)Mg~(2+)
