Central grey

Fig. 15. Growth of a (5ii,5n) tubule on the catalyst surface, illustrated by that of the (5,5) tubule. The central grey circle represents the catalyst particle with 10 coordination sites, and the small grey circles represent the other 10 catalyst coordination sites. The normal and bold lines represent single and double bonds, respectively, while coordinative bonds are represented by dotted lines [(a), (b) and (c)] (a ), (b ) and (c ) are the corresponding planar representations.

High amounts of somatostatin are found in the CNS, the peripheral nervous system, the gut and the endocrine pancreas whereas the kidneys, adrenals, thyroid, submandibular glands, prostate and placenta produce rather low amounts. In particular, the hypothalamus, all limbic structures, the deeper layers of the cerebral cortex, the striatum, the periaqueductal central grey and all levels of the major sensoty pathway are brain areas that are especially rich in somatostatin. Eighty percent of the somatostatin immunoreactivity in the hypothalamus is found in cells of the anterior periventricular nucleus (Fig. 1, [1]). The gut 5 cells of the mucosa and neurons, which are intrinsic to the submucous and... 

Efferent projections from the NAc core and shell topographically terminate in the lateral and medial ventral pallidus respectively, but in addition the NAc shell targets the lateral hypothalamus, central grey and nucleus of the solitary tract (Heimer et al., 1991). 

FIG U RE 3.1 Schematic (two-dimensional) presentation of preferential solvation in a binary mixture of solvents A (large circles) and B (small circles). In the first solvation shell of the central (grey) molecule, within the inner dashed circle, there are three A and one B molecule, so A preferentially solvates the central molecnle. In the outer solvation shell, which includes the inner shell, there are eight A and eight B molecnles, the same ratio as in the bulk, so no further preferential solvation takes place. 

Investigations in recent years have indicated a possible relationship between brain amine metabolism and Parkinson s disease. Dopamine, noradrenaline, and serotonin have a characteristic distribution in the human brain. Dopamine is found in especially high concentration in the nuclei of the neostriatum, i.e. in the caudate nucleus and putamen noradrenaline and serotonin predominantly in the hypothalamus, in the central grey matter, and in the reticular formation. The brain content of these amines is reduced in patients... 

Histologically, a diffuse, symmetrical, extensive demyelination is seen. There may be almost complete lack of myelin sheaths in the central nervous system (Jervis 1960) with the exception, in most cases, of some U-fibers and of myelin sheaths within the central grey nuclei and the optic radiation. Demyelination is most marked in the internal capsule and pyramidal tracts spinal roots and peripheral nerves are involved to a lesser degree (Jacobi 1947 Bertrand et al. 1954). There may be partial loss, or in the center of involved regions, complete loss of axis cylinders. In the periphery of demyelinized areas they may be swollen and terminally distended (Hollander and Pilz 1964). The axis cylinders of U-fibers are, in general, well preserved. Small inflammatory lymphocytic infiltrates may be seen perivascularly. 

Fig. 3. Snapshots of adsorbate microstructure at different pore sizes. For clarity in viewing the (dense) packing the molecules are displayed as lines, with the red portion representing oxygoi, and the central grey part representing carbon.

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