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Ganisl B Taucher M Riml C Breuker K 《European journal of mass spectrometry (Chichester, England)》2011,17(4):333-343
Acidic proteins and nucleic acids such as RNA are most readily ionized in electrospray ionization (ESI) operated in negative-ion mode. The multiply deprotonated protein or RNA ions can be used as precursors in top- down mass spectrometry. Because the performance of the dissociation method used critically depends on precursor ion negative net charge, it is important that the extent of charging in ESI can be manipulated efficiently. We show here that (M - nH)(n-) ion net charge of proteins and RNA can be controlled efficiently by the addition of organic bases to the electrosprayed solution. Our study also highlights the fact that ion formation in ESI in negative mode is only poorly understood. 相似文献
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Kathrin Bringmann Ben Kane 《Journal of Combinatorial Theory, Series A》2012,119(2):483-501
In this paper, we obtain infinitely many non-trivial identities and inequalities between full rank differences for 2-marked Durfee symbols, a generalization of partitions introduced by Andrews. A certain strict inequality, which almost always holds, shows that identities for Dyson?s rank, similar to those proven by Atkin and Swinnerton-Dyer, are quite rare. By showing an analogous strict inequality, we show that such non-trivial identities are also rare for the full rank, but on the other hand we obtain an infinite family of non-trivial identities, in contrast with the partition theoretic case. 相似文献
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Kathrin Bringmann 《Mathematische Zeitschrift》2006,253(4):735-752
In this paper we construct a lifting map from a vector space of generalized Jacobi cusp forms to a certain subspace of elliptic
cusp forms and vice versa such that both mappings are adjoint with respect to the Petersson scalar products. 相似文献
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Georg Schwedt Dirk-Oliver Waldheim Klaus-Dietrich Neumann Kathrin Stein 《Fresenius' Journal of Analytical Chemistry》1993,346(6-9):659-662
Summary A method for metal speciation using an enzyme reactor is described. The enzyme urease is immobilized on a polymer support. The parameters of the inhibition procedure are investigated for the determination of copper in drinking and surface water samples. The results are compared with those obtained by atomic absorption spectrometry. It has been found that the enzyme urease was inhibited only by free copper ions.Dedicated to Professor Dr. Wilhelm Fresenius on the occasion of his 80th birthday 相似文献
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