Bridging vein

The aplasia of the frontal superior sagittal sinus anterior to the coronary suture with compensation via large bridging veins. 

In a similar vein, the keto bridge in 5 can be replaced by oxygen with retention of activity. Reduction of acetophenone derivative 19 by means of sodium borohydride leads to the corresponding alcohol (20). Reaction with phosphorus tribromide with cyanide gives... 

Volume 2 in this series continues in the vein established by the first volume. The contributors are distinguished organic chemists whose work helps bridge the gap between theory and experiment. 

In a similar vein, tris-aluminium complexes have been reported in which related 2-methyl- and 2-phenyl-substituted azaindoles use their two N-centres to bridge two Group 13 metal centres. In either case the oxide itself adopts a trigonal planar geometry (angles sum to 360.0° and 359.7°, respectively) with... 

In a similar vein, it was shown that molybdenum amido derivatives of the isolobal terminal phosphide and carbide, " and related chalcogenide atoms,could be obtained. Detailed mechanistic studies of the Mo N(R)Ar 3/N2 system involving X-ray, EXAFS, magnetic, Raman, and isotopicaUy labelled NMR spectroscopy showed that the reaction proceeded through an intermediate involving an end-on bound N2 bridging the molybdenum centres (Scheme... 

The structural mutation of our 29 by variation of the macrocycle (via its heteroatoms and carbon bridges), the lumophore, and the spacer is obviously a rich vein to mine for luminescent PET sensors. Kubo s laboratory (formerly at Kyushu University, now at Kanagawa University, Japan) has systematically explored this line [81-84], 33 has a straight swap of 1-pyrenyl for 9-anthryl [81]. 34 to 36 [81-83] use two nitrogens in the crown ether instead of the one in 29,... 

Attention turned to the dinuclear carbonyls Mn2(CO)io, Re2(CO)io, and Co2(CO)g. Regarding mechanistic information, the study of Re2(CO)io has been the most fruitful. Here two distinct oxocarbonyl species, which appear to contain only one rhenium atom each, are formed. The final product of the reaction is the O-bridged oxide Re207. In a similar vein, Mn2(CO)io yields Mu207 upon matrix photooxidation, although there is no hint of any intermediate in this process, no matter what steps are taken to produce such species. The photooxidation of C02 (CO)g is likely to follow a pathway even more complex than that of Mn2(CO)io or Re2(CO)io- In this case not only is there competition between M-C and M-M bond ruptme as the primary photochemical step, but there is also the complication of photoisomerism of the molecule. 

Among the various polygonal assemblies that inorganic architectures can adopt, molecular squares are the most common. This fact can be attributed to the tendency of transition metals to form cis complexes with L-M-L bond angles of 90° and to the widespread availability of linear-bridging ligands. In this vein, Stang and coworkers... 

The transformation of the lobular architecture is initiated and maintained by at least two histomorphological processes (i.) piecemeal necrosis and (2.) bridging necrosis, which provides string-like links between the central veins and the portal fields. Portocentral shunts, which are of significance for the fate of cirrhosis, make use of these bridges as routes for their development. During the course of time, these channels, which acquire solid basal membranes like capillaries, carry the portal blood directly to the venous flow-off. As a result, blood is withdrawn from the respective acini these areas become more susceptible to disruption and damage and are forced to restructure anew, (see chapter 35)... 

Chronic autoimmune hepatitis If untreated, AIH (especially type 2) develops almost inevitably into cirrhosis the condition is further aggravated by the presence of multilobular necrosis and bridging necrosis. In bridging necrosis, development of cirrhosis is more rapid between the portal fields and the central vein than between the portal fields themselves, (s. p. 683) (s. fig. 33.4)... 

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