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101.
KM Clauwaert Van Bocxlaer JF HJ Major JA Claereboudt WE Lambert Van den Eeckhout EM Van Peteghem CH De Leenheer AP 《Rapid communications in mass spectrometry : RCM》1999,13(14):1540-1545
This paper describes the investigation of the potential of a quadrupole orthogonal acceleration time-of-flight mass spectrometer (Q-TOF) equipped with an atmospheric pressure ionisation interface for quantitative measurements of small molecules separated by reversed phase liquid chromatography. To this end, the detection limits and linear dynamic range in particular were studied in an LC/MS/MS experiment using 3,4-methylenedioxymethamphetamine standards and 3,4-methylenedioxyethylamphetamine for internal standardisation. In a second phase, the experiment was repeated with real biological extracts (whole blood, serum, and vitreous humour). A calibration for 3,4-methylenedioxymethamphetamine and its metabolite 3,4-methylenedioxyamphetamine was prepared in each of these matrices again using 3,4-methylenedioxyethylamphetamine as internal standard. The resulting quantitative data were compared with those obtained by liquid chromatography with fluorescence detection for the same extracts. The Q-TOF results revealed excellent sensitivity and a linear dynamic range of nearly four decades (2-10 000 pg on-column, r(2) = 0.9998, 1/x weighting). Furthermore, all the calibration curves prepared in biological material were superimposable, LC/MS/MS and LC-fluorescence, and the quantitative results for actual samples compared very favourably. It was concluded that the Q-TOF achieves a linear dynamic range for quantitative LC/MS/MS work exceeding that of fluorescence detection and at much better absolute sensitivity. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
102.
103.
Richa Upadhyay Sarvesh Pratap Kashyap Chandra Shekhar Singh Kavindra Nath Tiwari Karuna Singh Major Singh 《Applied biochemistry and biotechnology》2014,174(6):2195-2208
Germplasm storage of Phyllanthus fraternus by using synseed technology has been optimized. Synseeds were prepared from nodal segments taken from in vitro-grown plantlets. An encapsulation matrix of 3 % sodium alginate and 100 mM calcium chloride with polymerization duration up to 15 min was found most suitable for synseed formation. Maximum plantlet conversion (92.5?±?2.5 %) was obtained on a growth regulator-free ½-strength solid Murashige and Skoog (MS) medium. Multiple shoot proliferation was optimum on a ½ MS medium containing 0.5 mg/l 6-benzylaminopurine (BAP). Shoots were subjected to rooting on MS media containing 1 mg/l α-naphthaleneacetic acid (NAA) and acclimatized successfully. Encapsulated nodal segments can be stored for up to 90 days with a survival frequency of 47.33 %. The clonal fidelity of synseed-derived plantlets was also assessed and compared with that of the mother plant using rapid amplified polymorphic DNA and inter-simple sequence repeat analysis. No changes in molecular profiles were observed among the synseed-derived plantlets and mother plant, which confirms the genetic stability of regenerates. This synseed production protocol could be useful for in vitro multiplication, short-term storage, and exchange of germplasm of this important antiviral and hepatoprotective plant. 相似文献
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M.J. Emms J.B. Kinson B.J. Stacey M.F. Votruba P.L. Woodworth I.G. Bell M. Dale J.V. Major J.A. Charlesworth D.J. Crennell R.L. Sekulin 《Physics letters. [Part B]》1974,52(3):372-374
A search has been made for spectator delta resonances from the breakup of deuterons by a 4 GeV/c incident π+ beam. It is shown that the narrow pπ enhancement produced backwards in the laboratory system is mostly not Δ, and an upper limit of 0.8% is estimated for the Δ Δ component of the deuteron. 相似文献
107.
A. Schenck A. Amato F.N. Gygax M. Pinkpank A. Jung P. Wachter J. Major Th. Stammler R. Scheuermann 《Hyperfine Interactions》1997,104(1-4):209-213
The pressure dependence of the μ+-Knight shift in the pseudo‐binary compound Sm0.9La0.1S has been studied with the aim to verify microscopically the quenching of paramagnetism by the formation and condensation
of excitons in the insulating regime. A collapse of the μ+-Knight shift is indeed observed but it is not restricted to the insulating phase and may not reflect the bulk‐magnetic response.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
108.
Zheming Cheng Joel L. Lebowitz Péter Major 《Probability Theory and Related Fields》1994,100(2):253-268
Summary Let A be an oval with a nice boundary in 2,R a large positive number,c>0 some fixed number and a uniformly distributed random vector in the unit square [0,1]2. We are interested in the number of lattice points in the shifted annular region consisting of the difference of the sets {(R+c/R)A–} and {(R–c/R)A–}. We prove that whenR tends to infinity, the expectation and the variance of this random variable tend to 4c times the area of the set A, i.e. to the area of the domain where we are counting the number of lattice points. This is consistent with computer studies in the case of a circle or an ellipse which indicate that the distribution of this random variable tends to the Poisson law. We also make some comments about possible generalizations. 相似文献
109.
Chemical reactions of positronium studied by age-momentum correlation (AMOC) using a relativistic positron beam 总被引:1,自引:0,他引:1
P. Castellaz J. Major C. Mujica H. Schneider A. Seeger A. Siegle H. Stoll I. Billard 《Journal of Radioanalytical and Nuclear Chemistry》1996,210(2):457-467
Correlated measurements of the individual positron lifetimes (so-called positron ages) and of the Doppler shift of the 2-annihilation photon energy (Age-Momentum Correlation, AMOC) allow the evolution of the positron states to be observed in the time domain. The AMOC technique is thus especially useful when chemical reactions of positronium induce transitions between positron states. The full information contained in the AMOC data may be extracted from the two-dimensional AMOC histogramme, the so-called AMOC relief, by fitting a suitable two-dimensional model function. In this way quantitative information on the spin conversion of positronium by a paramagnetic radical in the systems HTEMPO/methanol and HTEMPO/benzene and on the formation of positron bound states in aqueous solutions of various sodium halides has been deduced. 相似文献
110.
B. T. Wilkins S. P. Stewart R. O. Major 《Journal of Radioanalytical and Nuclear Chemistry》1987,115(2):249-262
Methods for the analysis of129I and241Pu are described briefly. Neutron activation is necessary to achieve an adequate degree of sensitivity for the measurement of129I, but otherwise all laboratory manipulations are straightforward and use commonly-found, well-tried techniques. With these methods, both radionuclides can be measured easily in the terrestrial environment around a nuclear fuel reprocessing plant;241Pu is measureable elsewhere in integrating media such as undisturbed soil. 相似文献