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排序方式: 共有90条查询结果,搜索用时 31 毫秒
1.
D. Henneberg 《Fresenius' Journal of Analytical Chemistry》1966,221(1):321-341
Zusammenfassung Es wird die Auswertung von Massenspektren hoher Auflösung auf Photoplatten beschrieben.Das Auswertegerät projiziert einen 1×2 cm großen Ausschnitt der Platte auf eine 1×2 m große Fläche. Linienabstände werden mit einem photoelektrischen Längenschrittgeber in Einheiten von 2,5 gemessen. Das Gerät enthält ferner eine Abtastvorrichtung für das Linienprofil zur genauen Lokalisierung der Linien und zur Schwärzungsmessung sowie eine auf eine Masseneinheit genaue Massenanzeige. Die Einstellung der Linien erfolgt durch geschwindigkeitsgesteuerte Motoren von Hand, alle Meßdaten werden auf Knopfdruck vollautomatisch in digitaler Form ausgedruckt bzw. auf Lochkarten gestanzt.Auswerteverfahren unter Benutzung von Tischrechenmaschine oder Computer sowie Meßergebnisse werden diskutiert.
Der Vortrag in Lindau enthielt einen Überblick über den derzeitigen Stand der Datenerfassung und -verarbeitung für hochaufgelöste Massenspektren. Dieser Teil des Vortrages ist im wesentlichen enthalten in einem Bericht von D. Henneberg u. G. Schomburg: diese Z. 220, 192 (1966). 相似文献
Summary The evaluation of high-resolution mass spectra from photographic plates is described.The measuring apparatus projects a part of the plate (1×2 cm) onto a 1×2 m plane. Line distances are measured with a photoelectric device giving pulses for every 2.5 motion of a scale. In addition the apparatus contains a scanning device measuring the density profile across a line or a multiplet for localisation of a line and measurement of density and a unit which indicates the mass number with an accuracy of one mass unit. Adjustment of lines on a mark is done manually with the aid of speed-controlled motors. All measured data are automatically printed or punched in digital form by operation of a push-button.Methods of evaluation of data using a desk calculator and a computer are given and results are discussed.
Der Vortrag in Lindau enthielt einen Überblick über den derzeitigen Stand der Datenerfassung und -verarbeitung für hochaufgelöste Massenspektren. Dieser Teil des Vortrages ist im wesentlichen enthalten in einem Bericht von D. Henneberg u. G. Schomburg: diese Z. 220, 192 (1966). 相似文献
2.
Miral Dizdaroglu Dieter Henneberg Clemens Von Sonntag 《Journal of mass spectrometry : JMS》1974,8(1):335-345
Aldoses, ketoses, deoxy-aldoses, deoxy-keto-aldoses, lactones, deoxy-lactones and other similar compounds are readily reduced by NaBD4 to the corresponding polyalcohol. Their trimethylsilyl ethers show characteristic mass spectra which allow firm assignments of the position of deuteration and hence of the nature of the starting sugar compound. The g.c./m.s. coupling technique even allows trace analysis since full information can be derived from the most intense fragments of the mass spectra. 相似文献
3.
P. Aufmuth I. Henneberg A. Siminski A. Steudel 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1991,18(1):107-112
By means of classical interference spectroscopy, using enriched isotope samples, the isotope shift between178Hf and180Hf has been measured for 33 transitions in the Hf II spectrum. For the pure Russell-Saunders terms 5d 26s 4 F and2 F the parametric analysis yields a field-shift difference of 17(2) mK produced by the second-order interaction of the electrostatic operator and the field-shift operator. Semi-empirical calculations based on the non-relativistic Hartree-Fock method reproduce this value as well as the experimental field shifts if a factor of 1.68(6) is used to scale theab initio electron densities at the nucleus. The corresponding factor for the Hf atom is much smaller. This leads to a re-evaluation of screening ratios for Hf and to a more accurate value of the nuclear parameter λ178,180 (Hf)=0.072(4) fm2. 相似文献
4.
How preparation and modification parameters affect PB‐PEO polymersome properties in aqueous solution
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Joachim Habel Anayo Ogbonna Nanna Larsen Simon Krabbe Kristoffer Almdal Claus Hélix‐Nielsen 《Journal of Polymer Science.Polymer Physics》2016,54(16):1581-1592
The effect of formation and modification methods on the physical properties of polymersomes is critical for their use in applications relying on their ability to mimic functional properties of biological membranes. In this study, we compared two formation methods for polymersomes made from polybutadiene‐polyethylene oxide diblock copolymers: detergent‐mediated film rehydration (DFR) and solvent evaporation (SE). DFR‐prepared polymersomes showed a three times higher permeability compared to SE‐prepared polymersomes as revealed by stopped‐flow light scattering. SE‐prepared polymersomes broke down faster to structures <50 nm diameter when processed with extrusion, which was more pronounced at 5 mg mL?1, compared to 10, 20, and 25 mg mL?1. Our results indicate that the bilayer of SE‐prepared polymersomes has a lower apparent fluidity. We also investigated the role of n‐octyl‐β‐d ‐glucopyranoside (OG), a detergent typically used for reconstitution of membrane proteins into lipid bilayers. Specifically, we compared dialysis and biobeads for OG removal to investigate the influence of these methods on bilayer conformation and polymer rearrangement following detergent removal. There was no significant difference found between method, temperature, or time within each method. Our findings provide insight on how biocompatible polymersome production affects the physical properties of the resulting polymersomes. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1581–1592 相似文献
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6.
D. Henneberg 《Fresenius' Journal of Analytical Chemistry》1967,229(5):355-362
Ohne Zusammenfassung 相似文献
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L. Henneberg 《Annali di Matematica Pura ed Applicata》1931,9(1):58-67
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Sebastian T. Le QuementMette Ishoey Mette T. PetersenPernille M. Simonsen Nanna S. HolckThomas E. Nielsen 《Tetrahedron letters》2011,52(52):7049-7053
An approach for the solid-phase synthesis of apoptosis-inducing Smac peptidomimetics is presented. Using a Rink linker strategy, tetrapeptides mimicking the N-4-terminal residue of the Smac protein [(N-Me)AVPF sequence] were synthesized on PEGA resin in excellent purities and yields. Following two synthetic routes, a known tetrapeptide, incorporating a substituted proline, previously shown to exhibit excellent biological activity in vitro as well as low toxicity, was synthesized effectively on a solid support. 相似文献