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WL van Neerven 《Pramana》2000,55(1-2):101-111
We present some techniques which have been developed recently or in the recent past to compute Feynman graphs beyond one-loop
order. These techniques are useful to compute the three-loop splitting functions in QCD and to obtain the complete second
order QED corrections to Bhabha scattering. 相似文献
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Lakhani NJ Lepper ER Sparreboom A Dahut WL Venitz J Figg WD 《Rapid communications in mass spectrometry : RCM》2005,19(9):1176-1182
A liquid chromatography/tandem mass spectrometric (LC/MS/MS) assay was developed for the quantitative determination of 2-methoxyestradiol (2ME2) in human plasma. Sample pretreatment involved liquid-liquid extraction with ethyl acetate of 0.3-mL aliquots of plasma spiked with the internal standard, deuterated 2ME2 (2ME2-d5). Separation was achieved on a Zorbax Eclipse C18 column (2.1 x 50 mm, i.d., 5 microm) at room temperature using a gradient elution with methanol and water at a flow rate of 0.25 mL/min. Detection was performed using atmospheric pressure chemical ionization MS/MS by monitoring the ion transitions from m/z 303.1 --> 136.8 (2ME2) and m/z 308.1 --> 138.8 (2ME2-d5). Calibration curves were linear in the concentration range of 1-100 ng/mL. The accuracy and precision values, obtained from three different sets of quality control samples analyzed in quintuplicate on four separate occasions, ranged from 105-108% and from 3.62-5.68%, respectively. This assay was subsequently used for the determination of 2ME2 concentration in plasma of a patient with cancer after a single oral administration of 2ME2 at a dose of 2200 mg. 相似文献
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