Search Results - (Author, Cooperation:Q. Ou)
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1Latest Papers from Table of Contents or Articles in PressZ G Li, B Wang, B Ma, C Q Ou, G F Dong, F Y Yang and Y B Li
Institute of Physics (IOP)
Published 2018Staff ViewPublication Date: 2018-07-31Publisher: Institute of Physics (IOP)Print ISSN: 1755-1307Electronic ISSN: 1755-1315Topics: GeographyGeosciencesPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressJ. Liu ; M. Steiner ; J. A. Dunlop ; H. Keupp ; D. Shu ; Q. Ou ; J. Han ; Z. Zhang ; X. Zhang
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-02-26Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Arthropods/*anatomy & histology/*classification ; China ; Extinction, Biological ; Extremities/*anatomy & histology ; *Fossils ; *PhylogenyPublished by: -
3Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Column liquid chromatography ; Alcohols ; Pre-column fluorescence derivatizationSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary A sensitive LC method for the determination of alcohols, using fluorescent condensation agent carbazole-9-N-acetylbenzne-disulfonate(CABS), has been developed. A mixture of alcohols and triethylamine catalyst in dichloromethane or chloroform is treated with CABS to give quantitative yields of esters. Emission maximum for the derivatized alcohols is 365 nm (λex 335 nm). The labeled derivatives are very stable, no significant decomposition is observed after heating in 40% at 40°C for 24 h. The method, in conjunction with a multigradient program, offers baseline resolution of common alcohol derivatives on a reversed-phase C18 column. Studies on derivatization conditions indicate that primary and secondary alcohols react very fast with CABS in the presence of triethylamine in dichloromethane or chloroform to give the corresponding fluorescent derivatives. This method is more convenient and more efficient than previous methods which require prior conversion of carboxylic acids to acyl chlorides. The separation of alcohol derivatives has good reproducibility and the rsd's (n=5) for 50 pmol of each alcohol are 4%. Detection limits are at the fmol level.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Micellar electrokinetic chromatography ; Podophyllum emoddii var. chinesis SpragueSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary A crude chloroform extract of the roots ofPodophyllum emoddii var. chinesis Sprague was studied by micellar electrokinetic chromatography. Four peaks belonging to podophyllotoxin, 4′-desmethyl-podophyllotoxin, kaempferol and quercetin were identified by known standards. The four substances are valuable pharmaceutical ingredients of the plant.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Column liquid chromatography ; Cyclodextrin additives ; Fluorescence agentsSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary We report four new derivatization agents, acridone-N-acetic acid (ARC), carbazole-9-ylacetic acid (CRA), carbazole-9-ylpropionic acid (CRP), and 2-methyl-2-carbazole-9-ylacetic acid (MCRA), with strong fluorescence emission which has low dependence on solvent polarity. The emission maxima for ARC, CRA, CRP, and MCRA were 430 nm (λex 404 nm), 368 nm (λex 335 nm), 356 nm (λex 340 nm) and 360 nm (λex 330 nm), respectively. The effects of mobile-phase composition, pH, and temperature on the liquid chromatographic retention behavior of the four fluorescence agents were investigated. An experimental model was established for calculating the inclusion constants of cyclodextrin (CD) complexes in the dynamic state, using β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) as examples, and different mobilephase compositions. On the basis of the model, the inclusion constants of the solutes in pure water (K fw) were determined by extrapolation. The thermodynamic parameters (ΔH o and ΔS o) and dissociation constantsK am for the solutes in this chromatographic system were obtained by means of capacity factor (k) values using a corresponding model formulation.Type of Medium: Electronic ResourceURL: -
9Latest Papers from Table of Contents or Articles in PressUryu, O., Ou, Q., Komura-Kawa, T., Kamiyama, T., Iga, M., Syrzycka, M., Hirota, K., Kataoka, H., Honda, B. M., King-Jones, K., Niwa, R.
Genetics Society of America (GSA)
Published 2018Staff ViewPublication Date: 2018-01-30Publisher: Genetics Society of America (GSA)Print ISSN: 0016-6731Topics: BiologyPublished by: -
10Latest Papers from Table of Contents or Articles in PressYang, Z., Yang, N., Ou, Q., Xiang, Y., Jiang, T., Wu, X., Bao, H., Tong, X., Wang, X., Shao, Y. W., Liu, Y., Wang, Y., Zhou, C.
The American Association for Cancer Research (AACR)
Published 2018Staff ViewPublication Date: 2018-07-03Publisher: The American Association for Cancer Research (AACR)Print ISSN: 1078-0432Electronic ISSN: 1557-3265Topics: MedicinePublished by: