Stereo pictures

Figure 8.48. Three-dimensional stereo picture of O]- acid glycoprotein. The picture shows the +1 topology P-barrel that the protein has common with other members of the lipocalin family. Source Kopecky, V. Jr, Ettrich, R., Hofbauerova, K. and Baumruk. V, 2003, Biochemical Biophysical Research Communications. 300.41 >46.

With projection VE, stereo pictures are projected by means of a special projection system onto surrounding walls. Projection VE systems allow the user a higher degree of free movement because 3D glasses are the only device that has to be worn. Such a system make it possible to link up several users within a VE application. However, orientation and interaction within the virtual environment is more difficult because of the system s low grade of immersion. 

Figure 12. Crystal structure 3 of a saponin hydrolyzate obtained from Panax notoginseng-, a) atomic distances in pm b) bond angles in ° (grad) c,d) stereo pictures without (c) and with (d) vibrational ellipsoids of atoms for viewing the three-dimensional picture of molecular structure with...

Fig. 49 Orbital symmetry at central spiro-carbon atom in case of spiro-binding interaction (stereo picture)...

Photograph 1. Parallel cameras setting for taking stereo pictures. 

Photograph 2. Front view of slope for taking stereo pictures (dotted line is the constructed area of excavation tunnel). 

Stereo pictures of the different bioactive conformations of sLe from Table 1 are shown in Figure 7. It has been shown that for biological activity the relative orientation of the fucose and the neuraminic acid residue are relevant [11, 12]. Following this guide line, a potent mimic of sLe had been synthesized [11-13]. A conformational analysis of this sLe mimic in the free and bound state [60] clearly showed that the bioactive conformation is very similar to the one derived originally for sLe bound to E-selectin [19]. 

Figure 5. Stereo picture of a Mg + chelated chromomycin A3 (11) dimer bound to d(AACJGCCTT)2 [91] as retrieved from the Brookhaven database (ld83). The hydrogen atoms are omitted to simplify the representation of the complex. The DNA duplex is represented as a CPK model (grey) and both the chromomycin dimer and magnesium ion are shown in black.

For visual observation of the cell interior through the sapphire windows a lamp mounted behind one end is used. A mirror and stereo microscope at the other end facilitate the observation. The microscope is equipped with a normal camera or a video camera. Normally the phenomena within the cell are continuously observed and controlled with video camera and colour monitor. A video recorder serves for documentation, for inspection of short time processes and for the production of standing flame pictures for size and shape determination. Instead of the microscope a Jarrell-Ash diode array rapid scan spectrometer can be attached to the cell to obtain flame spectra in the visible and UV-regions. 

She left him alone in the house that afternoon and after Lizzy had gone Holmes wandered through the kitchen, surprisingly sparse for a commercial cook, into the bathroom big and blue to a sunroom of books records a stereo and pictures. And a low makeshift couch on which two cats, part black part Burmese, slept in a monkey grip. 

An orbital picture and a stereo view of the acetate ion, showing the equivalence of the two oxygen atoms. 

A critical, systematic study of the expanding macromole-cular data base may be predicted to yield insights into the mode of action of small and large molecules. The complexity of even these simplified models is such that the uninitiated viewer requires time and a variety of stereo cues in order to perceive the spatial relationships discussed. For this reason a short motion picture film will be shown. 

Dihydro intermediates were omitted from these road maps on the basis that they do not have any stereochemical significance over that possessed by the tetralins. Hexahydro intermediates are ignored as being too short lived to be desorbed in significant amounts. The second step is pictured as cis addition of hydrogen to the tetralins to form octalins with essentially randomly distributed double bonds. Only those octalins in which the double bond involves one or two of the three bridgehead positions are shown. The others would be stereo-ohemically significant only if double-bond isomerization is fast, as it is... 

Figuie 55. Stabilization of positively charged groups by bridging water molecules in the active site of native ribonuclease A without anions. The stereo drawing corresponds to a snapshot of the molecular dynamics trajectory at 15 ps. The picture includes only residues Lys-7, Arg-39, Lys-41, Lys-66, His-119, and the bound water molecules. The hydrogen-bonding criterion is the same as used in Fig. 54. 

For A-acyliminium ions that (can) adopt the s-cis conformation, the mechanistic picture is quite different. Now the /V-acyliminium intermediate reacts as a 4ir-electron component in a Diels-Alder cycloaddition with inverse electron demand (equation 28). " This process also shows high regio- and stereo-selectivity in most cases. A nice illustration of high stereospecificity is found in recent work on the intramolecular Diels-Alder reaction of A-acyliminium species (equations 29 and 30). The bis-amides (50) and (51) serve as precursors to the reactive intermediates, which cycloadd to the alkenes with high selectivity to give r/a s-fused bicyclic 5,6-dihydro-1,3-oxazines. 

Fig. (23). Stereo representation of the X-ray structure of SERCA with a hound molecule of thapsigargin (TG) [147] (PDB code 1IWO). The lower picture shows TG in a surface representation of the binding site illustrating the perfect fit of the very potent inhibitor.

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