Water on porous, nitrogen-containing layered carbon materials: the performance of computational model chemistries.

Porous, layered materials containing sp-hybridized carbon and nitrogen atoms, offer through their tunable properties, a versatile route towards tailormade catalysts for electrochemistry and photochemistry. A key molecule interacting with these quasi two-dimensional materials (2DM) is water, and a photo(electro)chemical key reaction catalyzed by them, is water splitting into H and O, with the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) as half reactions. The complexity of some C/N-based 2DM in contact with water raises special needs for their theoretical modelling, which in turn is needed for rational design of C/N-based catalysts.

[Prevention of thromboembolism in minimal invasive interventions and brief inpatient treatment. Results of a multicenter, prospective, randomized, controlled study with a low molecular weight heparin].

A prospective, randomised, controlled clinical trial was carried out in order to elucidate the incidence of venous thromboembolism in selected patients undergoing laparoscopic cholecystectomy and other types of minimally invasive surgery, as well as to show safety and efficacy of a low-molecular-weight heparin (LMWH) in the prevention of post-operative venous thromboembolism. Seven hundred and eighteen patients were randomly allocated to one of two groups: One group received physical measures for prevention of deep-vein thrombosis, i.e.

[Indication and operative technique in chronic occlusions of the innominate artery and proximal subclavian artery (author's transl)].

Surgery is indicated in clinical stage II and cases of subclavian steal syndrome. Endarterectomy by mid-sternotomy is the operation of choice for obliteration of the innominate artery. The lethality rate is 6%.