Axially Symmetric Type

Violent oscillations of the axially symmetric type can be induced in single drops formed at a nozzle. Drops of chlorobenzene (Dg = 0.985 cm) were so formed, and allowed to fall in water. At about five inches below the nozzle two types of rupture were observed. A small droplet was formed at the front and hurled ahead of the drop by the next oscillation. A second mode of formation caused a droplet to be formed by inertial pinch at the rear of the oscillating drop. This rear-formed droplet was always larger than the very small one formed in front. There were, on occasion, two successive pinch-formed droplets from the rear. In a few instances both front and rear formation occurred, as shown in Fig. 13 in selected... 

One-electron oxidation of the vinylidene complex transforms it from an Fe=C axially symmetric Fe(ll) carbene to an Fe(lll) complex where the vinylidene carbon bridges between iron and a pyrrole nitrogen. Cobalt and nickel porphyrin carbene complexes adopt this latter structure, with the carbene fragment formally inserted into the metal-nitrogen bond. The difference between the two types of metalloporphyrin carbene, and the conversion of one type to the other by oxidation in the case of iron, has been considered in a theoretical study. The comparison is especially interesting for the iron(ll) and cobalt(lll) carbene complexes Fe(Por)CR2 and Co(Por)(CR2) which both contain metal centers yet adopt... 

It should be noted that these types of spectra are expected only for quadrupolar nuclei of semiconductors in non-cubic axially-symmetric forms such as the WZ structure cubic forms such as ZB or rocksalt structures ideally lack any anisotropy, and the ST peaks overlap the CT peak. However, defects in such cubic structures can produce EFGs that have random orientations, and the resulting ST are spread out over a wide range. 

Since many planar metal complexes have nearly axially symmetric g and AM tensors, two-dimensional powder ENDOR spectra can easily be obtained from such compounds oriented in nematic glasses84. As mentioned, interpretation of this type of spectra will be discussed in Sect. 4.3. 

It can easily be shown that ao.rand is independent of anisotropy for any type of anisotropy, not only axially symmetric [21]. Changing the coordinate system of Eq. (3.21) to the local one determined by the anisotropy direction of each spin. 

Radical 15, C4 (-H) , could be only tentatively identified. ENDOR spectra indicated that it was present in two slightly different conformations at 10 K. At 150 K, the ENDOR line associated with the 2.89 mT coupling decreased in intensity and that associated with the 2.80 mT line increased, indicating the radical relaxes into a more stable conformation at 150 K. A variety of small couplings were observed, but not characterized, in both conformations of 15. An unidentified likely sugar radical was detected in 2 -deoxycytidine hydrochloride through observation, in both deuterated and undeuterated crystals, of a nearly axially symmetric 0-type coupling with Aiso = 3.21 mT. It appears to exist in three different conformations at 10 K at 150 K, one of these conformations seems to disappear, and two appear to increase in concentration. 

Because of their structural and spectroscopic analogies with the hemo-chromes Fe(P)L2, e.g. the protoporphyrin derivative 3 (L, L = Py or 1-Meim), the corresponding 4d and 5d homologs are named ruthenochromes or osmo-chromes . The hemochromes derive their name from the cytochromes, the widespread electron-carrying heme proteins. Cytochrome b (coordination type F, M = Fe) has two imidazole donors from histidine side chains at the central iron, cytochrome c (coordination type G, M = Fe) an imidazole and a methyl-thioether function from a methionine. F is an axially symmetrical, G an axially unsymmetrical system. 

Very often the capillary menisci have rotational symmetry. In general, there are three types of axially symmetric menisci corresponding to the three regions denoted in Figure 5.8 (1) meniscus meeting the axis of revolntion, (2) meniscns decaying at inhnity, and (3) meniscus confined between two cylinders, 0 < Pj < r < P2 < °°- These three cases are separately considered below. 

An icosahedral capsid has 12 fivefold, 20 threefold and 30 twofold symmetry axes. This situations yields a second question, whether clusters of coat proteins having one of these axial symmetries share a form lattice of the same type as in the axially symmetric biomolecules discussed above. 

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