A Catalytic Enantioselective Electron Transfer Reaction: Titanocene-Catalyzed Enantioselective Formation of Radicals from meso-Epoxides.

A rationally designed titanium(III) catalyst allows the opening of epoxides with high enantioselectivity. This reaction [Eq. (1)] constitutes the first example of an enantioselective transition metal catalyzed radical reaction that proceeds by electron transfer.

[The value of meniscus sonography--a study with reference to clinical and arthroscopic findings]. / Uber den Wert der Meniskussonographie--Eine Studie unter Berücksichtigung des klinischen und arthroskopischen Befundes.

In a prospective study the sonographic findings of 250 patients were compared with the results of their clinical and arthroscopic examinations, in order to test the value of ultrasonography of the meniscus. At the same time the influence of interfering factors and the value of certain sonographic criteria were investigated. Diagnostic sensitivity of sonography proved to be 71% for the medial meniscus and 85% for the lateral meniscus. The division into parts made us realize that there was a high rate of errors. Sonography did not provide us with an essentially greater degree of information, except in certain cases such as ganglions, for example. Errors in diagnosis were evident in radial tears and in certain parts of the meniscus (Pars intermedia, Pars anterior and lateral meniscus). There is insufficient imaging especially in radial tears and cases of adiposis and osteoarthritis.

[Digital subtraction angiography in percutaneous transluminal angioplasty of vessels of the extremities and renal vessels]. / Digitale Subtraktionsangiographie bei perkutaner transluminaler Angioplastie der Extremitäten- und Nierengefässe.

The new imaging method digital subtraction angiography (DSA) permits intravenous arteriography. 1259 patients were thus investigated over one year. The lower extremities comprised 21,4% of assessment areas. 120 investigations in 95 patients were based on an indication of percutaneous transluminal angioplasty (PTA). DSA can be used before and after the PTA. The small extent of invasiveness and the shortening of in-patient admission are particular advantages preoperatively. These advantages, in addition to the possibility of out-patient evaluation, are also true for DSA in comparison to the conventional arteriography. Thus the combination of both methods has been found to be very suitable.