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21.
Structure of N, N′-Bis (trimethylsilyl) Dithiooxamide An X-ray analysis of a compound prepared by WALTER et al. and formulated as N, N′-bis(trimethylsily1) dithiooxamide proves that the suggested structure is correct for the solid state. The compound crystallizes in the orthorhombic space group Pbcn with lattice constants a = 10.702, b = 12.485, c = 11.733 Å and Z = 4. The molecular symmetry is 1 . 相似文献
22.
P. Schaltegger H. Beilner G. Reckel H. Müller-Merbach G. Gallus O. Müller H. Rinne H. -J. Zimmermann A. Klingst R. Lott 《Mathematical Methods of Operations Research》1973,17(6):B253-B260
Ohne Zusammenfassung 相似文献
23.
Friedrich Rinne 《Colloid and polymer science》1933,62(2):216-226
Ohne Zusammenfassung
Der Freiburger Wissenschaftlichen Gesellschaft sei für Unterstützung der Untersuchungen bestens gedankt. 相似文献
24.
R. Rinne P. Klinger H. Fueke H. J. van Royen und H. Grewe 《Fresenius' Journal of Analytical Chemistry》1935,100(1-2):48-50
Ohne Zusammenfassung 相似文献
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A fast and sensitive capillary liquid chromatography (cLC) column-switching method with electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) detection for the simultaneous determination of dopamine (D), epinephrine (E), norepinephrine (NE) and serotonin (SE) was pursued. A sample volume of 100 microl was loaded with a mobile phase containing 0.1% pentafluoropropionic acid (PFPA) as ion-pairing agent on a 25 mm x 0.32 mm (i.d.) 5 microm Hypercarb column. A water-acetonitrile (AcN) gradient with 0.1% acetic acid (AcOH) backflushed the compounds onto a 34 mm x 0.32 mm (i.d.) 5 microm Hypercarb analytical column. However, during a series of analyses, oxidation of the catecholamines (CAs) was observed. This was suspected to be due to the loading mobile phase composition and precluded the usefulness of this method even though the achievable detection limit was in the range of 0.75-3.0 ng/ml. The combination of the porous graphitic carbon (PGC) material and the fluorinated strong acids which were required to get enough retention for preconcentration of large volumes cannot be used for easily oxidized compounds as the CAs. 相似文献
28.
Jari Herranen Johanna Kinnunen Britta Mattsson Hannu Rinne Franciska Sundholm Lena Torell 《Solid State Ionics》1995,80(3-4):201-212
PEO sulfonic acids with Mw in the range 446–4246 have been prepared. Mechanically stable polyelectrolyte films containing high molar mass PEO and PEO sulfonic acids were prepared. The PEO sulfonic acids and the polyelectrolyte films were examined by thermal analysis, optical microscopy, Raman spectroscopy, and impedance spectroscopy. While the low molar mass PEO sulfonic acids were completely amorphous, sulfonic acids with Mw ≥ 1246 show considerable crystallinity. Experimental data indicate aggregation of the low molar mass PEO sulfonic acids through hydrogen bonds. The PEO sulfonic acids are miscible with high molar mass PEO and form free standing polyelectrolyte films. The PEO sulfonic acids with the lowest molar masses have a plasticizing effect on the high molar mass PEO. The crystallinity of the films decreased as the concentration of sulfonic acid increased. The films are stable at RH ≤ 75%, and for some mixtures protonic conductivities of 10−3 S cm−1 at room temperature were reached. 相似文献
29.
H. Rinne B. Wobith J. Schwarze P. Kall A. Jaeger N. Szyperski G. Zäpfel L. v. Dobschütz 《Mathematical Methods of Operations Research》1979,23(2):B59-B64
Ohne Zusammenfassung 相似文献
30.
Rinne S Ramstad Kleiveland C Kassem M Lea T Lundanes E Greibrokk T 《Journal of separation science》2007,30(12):1860-1869
An online 2-D strong cation exchange (SCX)-RP capillary liquid chromatographic (cLC) method with IT mass spectrometric (IT-MS/MS) detection for the simultaneous determination of prostaglandin (PG) A(1), PGD(2), PGE(1), PGE(2), PGF(2a), 6-keto-(6k)PGF(1a), and 15-Delta(12,14)-deoxy-PGJ(2) (15dPGJ(2)) in cell culture supernatants was developed and validated. Pretreatment of the cell culture supernatants included dilution and filtration, and the analysis time including all sample preparation steps was less than 50 min per sample. Peptides/proteins contained in the matrix were removed by the SCX column. LODs in the range of 0.4-2.2 ng/mL cell culture supernatant, recoveries higher than 80% and within- and between-day precisions of less than 30% RSDs were obtained. Human mesenchymal stem cells (hMSCs) were stimulated with cytokine-containing supernatants derived from activated T lymphocytes, and PG production was analyzed using the developed method. PGE(2 )was found in cultures from both untreated and stimulated hMSCs, while PGE(1) was present above the detection limit only in stimulated cells. 相似文献