Heiles

Comhretum micranthum. From the leaves of this W, African native drug Lahmann prepared a non-volatile alkaloid, combretine. (Heil u. Gewurz-Pflanzen, 1943, 22, 1 Chem. Abstr., 1946, 40, 7523.)... 

Recently, multidimensional GC has been employed in enantioselective analysis by placing a chiral stationary phase such as a cyclodextrin in the second column. Typically, switching valves are used to heart-cut the appropriate portion of the separation from a non-chiral column into a chiral column. Heil et al. used a dual column system consisting of a non-chiral pre-column (30 m X 0.25 mm X 0.38 p.m, PS-268) and a chiral (30 m X 0.32 mm X 0.64 p.m, heptakis(2,3-di-(9-methyl-6-(9-tert-butyldimethylsilyl)-(3-cyclodextrin) (TBDM-CD) analytical column to separate derivatized urinary organic acids that are indicative of metabolic diseases such as short bowel syndrome, phenylketonuria, tyrosinaemia, and others. They used a FID following the pre-column and an ion trap mass-selective detector following the... 

Figure 15.8 Multidimensional GC-MS separation of urinary acids after derivatization with methyl chloroformate (a) pre-column cliromatogram after splitless injection (h) Main-column selected ion monitoring cliromatogram (mass 84) of pyroglutamic acid methyl ester. Adapted from Journal of Chromatography, B 714, M. Heil et ai, Enantioselective multidimensional gas chromatography-mass spectrometry in the analysis of urinary organic acids , pp. 119-126, copyright 1998, with permission from Elsevier Science.

M. Heil, E. Podehrad, T. Beck, A. Mosandl, A. C. Sewell and H. Bohles, Enantioselective multidimensional gas clnomatography-mass spectrometiy in the analysis of urinary organic acids , 7. Chromatogr. 714 119-126 (1998). 

Heidekom, n. buckwheat (Fagopyrum). Heidelbeere,/. whortleberry bilberry. Heidetorf, m. peat, heikel, a. critical delicate, heil, a. whole, sound, well. — — werden, heal, become well. 

Heil-. healing, curative, therapeutic, medical, -anstalt, /. hospital, sanatorium, heilbar, a. curable. 

Heil-formel, /. (Med.) prescription, -gerati n, therapeutic Apparatus, heilig, a. holy solemn, sacred, heiligen, v.t. hallow, sanctify consecrate. Heiligen-harz, n. guaiacum (resin), -holz, n. 

Heil-serum, n. antitoxic serum, -stoff, m. curative, remedy, -stofflehre, /. pharmacology, pharmacy. 

Heilung,/. healing, curing, cure. Heilungsvorgang, m. healing process. Heil-verfohren, n. healing process, -wasser, n. curative water, mineral water, -wert, m. therapeutic value. -wesen, n. medical affairs, -wirkung,/. curative effect, -wissen-schaft,/. medical science. 

A list of the systems investigated in this work is presented in Tables 8-10. These systems represent 4 nonpolar binaries, 8 nonpolar/polar binaries, and 9 polar binaries. These binary systems were recognized by Heil and Prausnitz [55] as those which had been well studied for a wide range of concentrations. With well-documented behavior they represent a severe test for any proposed model. The experimental data used in this work have been obtained from the work of Alessandro [53]. The experimental data were arbitrarily divided into two data sets one for use in training the proposed neural network model and the remainder for validating the trained network. 

Using the same method as described in II.B, Binsch and Heil-bronner have examined the second-order bond distortion in the lowest excited states of nonalternant hydrocarbons (I, IV—VII, X, XI, XIII — XV and XVII), and have shown that, of the molecules examined, only VI and XVII suffer a molecular-symmetry reduction in the lowest... 

Figure 18. Trajectories in the Henon-Heiles potential for the initial condition xo ya = —0.37. The marks ( ) indicate the location of caustics. Taken from Ref. [29].

The Driven Henon-Heiles System V. Outlook Open Problems... 

The diagnostic power of the time-dependent invariant manifolds Wu and Ws as separatrices between reactive and nonreactive trajectories was illustrated in Ref. 40 for the example of a driven Henon-Heiles system described by the Hamiltonian... 

Figure 6. The deterministic potential (80) of the driven Henon-Heiles system. A central well is separated from three asymptotic channels by three saddle points SA, SB, and Sr. Also indicated is the surface, Eq. (82), on which initial conditions are sampled. (From Ref. 40.)...

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