Orientation right-handed

Figure 1 Examples of chiral metallointercalators that bind DNA with little site selectivity (above) and with high specificity for the targeted sites shown (below). In the center is shown schematically the basis for enantiomeric discrimination in stacking in the right-handed DNA helix. For the A-isomer, the ancillary ligands have a right-handed orientation in the DNA groove, whereas for the left-handed A-isomer, steric clashes between the ancillary ligands and phosphate backbone can develop.

The distrubution of substituent groups from the backbone ofa polymer is tacticity and it is displayed in Figure 2 of Appendix II. Polymers in which every repeat unit has the same left- or right-handed orientation with respect to the backbone of the chain are called isotactic. Polymers in which the optical orientation of each repeat unit with respect to the backbone of the chain is the opposite of the preceding repeat unit are called syndiotactic. Polymers in which there is no order or pattern to the distribution of optically active sites with respect the the backbone are called atactic. 

Looking from this side, i.e. in the direction of bj means choosing a directional sense. In the case shown above this is the direction of a right-handed screw, so we call this a right-handed orientation, in accordance with the orientation of thumb, index finger and middle finger of the right hand. The opposite case is a left-handed screw or a left-handed orientation. 

This sign is called the orientation of the tetrahedron or the atom quadruple, in accordance with the definition of orientation given in Chapter 3 on chirality Suppose we have chosen a right-handed orientation of the 3D space, according to Definition 3.6 ... 

Now we suppose that the quadruple of atoms (og, p 02, of) is arranged such that viewing from og, the triple of remaining atoms ( p 2,03) appears in clockwise order. Then, the quadruple of atoms also has a right-handed orientation ... 

Helicoidal architectures have also been found in the epicarp of different fruits (Figure 17.5). The first observation of this phenomenon was reported by D. Lee in 1991 in Elaeocarpus. Recently, similar structures have been observed in the fruit of Margaritaria nobilis and Pollia condensate. While all the other published examples of helicoidal architectures (both in cellulose and chitin) are left-handed, the fruit of Pollia condensata has also cell walls with right-handed orientation of the cellulose structures. 

Figure Al.4.4. The definition of the Euler angles (0, ( ), x) that relate the orientation of the molecule fixed (x, y, z) axes to the (X, Y, Z) axes. The origin of both axis systems is at the nuclear centre of mass O, and the node line ON is directed so that a right handed screw is driven along ON in its positive direction by twisting it from Z to z through 9 where 0 < 9 < n. ( ) and x have the ranges 0 to In. x is measured from the node line.

Figure Cl.5.14. Fluorescence images of tliree different single molecules observed under the imaging conditions of figure Cl.5.13. The observed dipole emission patterns (left column) are indicative of the 3D orientation of each molecule. The right-hand column shows the calculated fit to each observed intensity pattern. Molecules 1, 2 and 3 are found to have polar angles of (0,( ))=(4.5°,-24.6°), (-5.3°,51.6°) and (85.4°,-3.9°), respectively. Reprinted with pennission from Bartko and Dickson [148]. Copyright 1999 American Chemical Society.

Fig. 3. Raman intensities as a function of the sample orientation for the (10, 10) armchair CNT. As shown on the right, 0 and 62 are angles of the CNT axis from the z axis to the x axis and the y axis, respectively. 63 is the angle of the CNT axis around the z axis from the x axis to the y axis. The left and right hand figures correspond to the VV and VH polarisations [12].

Fig. 9. The right-handed (R) and left-handed (L) three-fold helices of i-PP. For each handedness, the two different orientations (up or down) with respect to the reference axis are shown. The heights of the methyl groups are expressed ic c/6 units...

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