AbrlracL ?he spin dynamics of magnetic impurities is shown la play a crucial rule in mesoscapic effects. It follows h m lhis analysis lhat the quantum magnetwnduclance Osdllations in a mesoscopic ring of a diluted magnetic alloy are gradually suppressed m lhe paramagnetic regime, whereas a strong magnetic Seld forbids spin-flip processes and mtores the mesosmpic Aharonov-Bohm &lalions with an amplitude limited by the efficiency of electron escape to lhe bulk ?his &ecl is examined analytically using a model of a quasi onedimensional ring joined la the eledmdes tunnelling oml am OT short leads. Benoit A 1990 pivale "munication de Vegvar P G N, Jzvy L P and Fulton T A 1991 @s. REX Lett 66 2380 Mi 4 Bugmann G and Pelem R-P 1988 Phys Rn! B 38 11751 Fallm V t 1991 JETP Lett 53 340; 1591 Sot! phys. Low Tmp. 17 1173 Komnga J 1959 phvsicn 16 601 Stone A D and lmry Y 1986 Phys. Rcu L a L 54 189 Fal'b V I and Khmd'nilskii D E 1989 SOL! phys lETP 6% 186 Khmcl'nilskii D E and Larkin A I 1986 phys. Sm T 14 4 Scrota R 4 Fcng Sh. Kanc C and Lce P A 1987 Ply. &. B 35 5031 Kanc C, Le P A and D i V i c c m D P 1988 @ s h B 38 W95 DiVianzn D P and Kanc C 1988 Phys Rex B 38 3w6 Santhanam P 1989 @ s Rn B 39 2541 Buttiker M 1988 IllM 1 Rrt Dfl! 32 317 Hcrsh6cld S 1991 Bzp. REX B 44 3320 Amaral v s 19901 Phys: C & Mamr 2 8201
Simultaneous measurement of the circulating testosterone (TS) and dehydroepiandrosterone sulfate (DHEAS) is deemed to be helpful for the assessment of men's health.Liquid chromatography/electrospray ionization-tandem mass spectrometry (LC/ESI-MS/MS) is the most reliable methodology for this purpose, however, it has room for improvement in analysis throughput.In this study, a quadruplicate of the Girard reagents was used to develop an LC/ESI-MS/MS method capable of quantifying TS and DHEAS in four different serum samples in a single run. The four serum samples were separately pretreated, derivatized with one of four Girard reagents, then combined.The LC/ESI-MS/MS analysis of the combined sample provided the androgen concentrations of four serum samples in parallel. The method had practical measuring ranges, in which good precision and accuracy, and negligible matrix effects were verified. The speed-up capability of the developed method was evaluated through the analysis of 10 batches of serum samples (total 40 samples); the method saved a 60% post-pretreatment analysis time compared to the non-derivatization method for 40 samples.
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