Keunings

Keunings, R., 1989. Simulation of viscoelastic fluid flow. Tn Tucker, C. L. HI (ed.), Computer Modeling for Polymer Proces.sing, Chapter 9, Hanser Publishers, Munich, pp. 403-469. 

I. Verpoest, M. Desaeger, and R. Keunings, Composites, Controlled Interphases in Composite Materials, (H. Ishida, ed.), Elsevier Science Publishing Co. Inc., p. 653... 

B.Ramachandra, Jung Sik Choi , Keun-Soo Kim , Ko-Yeon Choo, Jae-Suk Sung and Tae-Hwan Kim ... 

Prof, Dong-Keun Lee Gyeongsang National University... 

Keuning S, DB Janssen, B Witholt (1985) Purification and characterization of hydrolytic haloalkane dehalogenase from Xanthobacter autotrophicus GJ 10. J Bacterial 163 635-639. 

Molecules having only a sulfoxide function and no other acidic or basic site have been resolved through the intermediacy of metal complex formation. In 1934 Backer and Keuning resolved the cobalt complex of sulfoxide 5 using d-camphorsulfonic acid. More recently Cope and Caress applied the same technique to the resolution of ethyl p-tolyl sulfoxide (6). Sulfoxide 6 and optically active 1-phenylethylamine were used to form diastereomeric complexes i.e., (-1-)- and ( —)-trans-dichloro(ethyl p-tolyl sulfoxide) (1-phenylethylamine) platinum(II). Both enantiomers of 6 were obtained in optically pure form. Diastereomeric platinum complexes formed from racemic methyl phenyl (and three para-substituted phenyl) sulfoxides and d-N, N-dimethyl phenylglycine have been separated chromatographically on an analytical column L A nonaromatic example, cyclohexyl methyl sulfoxide, did not resolve. 

From the mid-igSo s, a number of initiatives was made to produce reference publications describing the current state of RM availability, the activities of the producers, and their future plans. Whilst the documents themselves were useful, they were generally out of date by the time they were published, were not regularly updated and, with one or two exceptions, have not endured. None was completely comprehensive, with the IAEA and Cantillo s work focused on environmental analysis. (IAEA 1985, 1990, 1996 Delve and Keune 1992 Rasberry 1994, 1996 Can-tillo 1995). 

Deive M, Keune H. (1992) Survey of Institutions, Organizations and Laboratories Manufacturing Supplying or Using RMs. UNEP-HEM, Published by GSF Neuherberg, Germany. 

Shigematsu, T., Pfannes, H.-D., Keune, W. In Mossbauer Spectroscopy and its Chemical Applications. American Chemical Society, Washington, DC (1981)... 

In-Won C, Moore NA, Won-Keun O, et al. Behavioral pharmacology of polygalas-aponins indicates potential antipsychotic efficacy. Pharmacol Biochem Behav 2002 71 191-195. 

Jongwon C, Keun H, Suk-Hwan K, Kyung-Tae L, Hyeong-Kyu L. Hee-Juhn P. Kalopanaxsaponin A from Kalopanax pictus, a potent antioxidant in the rheumatoidal rat treated with Freund s complete adjuvant reagent. J Ethnopharmacol 2002 79 113-118. 

Keune K., Binding medium, pigments and metal soaps characterized and localized in paint cross sections, PhD Dissertation, University of Amsterdam, 2005. 

In an article published in Analytical Chemistry in 2004, Keune and Boon [2004a] present the application of ToF-SIMS analysis to a paint cross-section. The sample used was from the panel painting The Descent from the Cross (Museo del Prado, Madrid) by the early Flemish painter Rogier van der Weyden (1399/1400 1464). Scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX) and infrared microscopy were also used to complete and confirm the results. 

In addition to these numerous results, two other points are discussed by the authors fatty acid speciation and oil identification. These two aspects are developed in another publication written by the same authors [Keune et al. 2005]. The fatty acid speciation is based on the positive ion ToF-SIMS analysis and aims to prove if the fatty acids detected exist as free fatty acids, ester bound fatty acids or metal soaps. On account of the study of different standards, it is shown that when free fatty acids are present, the protonated molecular ion and its acylium ([M-OH]+) ion are detected. In cases of ester-bound fatty acid only the... 

To identify the kind of oil, Keune et al. [2005] used the classical approach based on the palmitic acid/stearic acid (P/S) ratio usually obtained from GC/MS data. Ratios less than 2 correspond to linseed oil, whereas ratios higher than 5 correspond to poppy seed oil. Intermediate values can be attributed to walnut, poppy seed oil or mixtures [Schilliing and Khaijan 1996]. Keune et al. first show that ionization efficiency is the same for the two fatty acids in negative ion mode permitting the use of ToF-SIMS for the calculation of the P/S ratio. A test on the oil-paint model system shows a ratio of 2.0 for linseed oil and 3.6 for poppy seed oil, which can allow the two oils to be differentiated. Nevertheless, it is important to note that the ratio is not constant all over the cross-section. 

The problem of interaction between binding media and inorganic ions has already been mentioned in the case of binding media identification [Keune and Boon 2004a]. This problem has been further developed in other research by the same team. 

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