Abstract Non-negative matrix factorization (NMF) is a recently developed technique for finding parts-based, linear representations of non-negative data. Although it has successfully been applied in several applications, it does not always result in parts-based representations. In this paper, we

'exigence, tant au niveau national qu’européen, de finaliser la plupart des activités de recherche (toutes?) pour des applications industrielles prévisibles. The access to scientific knowledge is a construction of objectivity which needs the critical insight of "negative results". These consist

results. analysis of specimens with false-negative immunodeficiency virus type 1 PCR and Performance of the Amplicor human

A huge pseudoaneurysm of the left ventricle after simple gluing of an oozing-type postinfarction rupture

Open stent-grafting: aborted procedure in a patient with mega aorta syndrome

laboratories

Host factors do not influence the colonization or infection by fluconazole resistant Candida species in hospitalized patients

Catastrophic haemoptysis during rigid bronchoscopy: a discussion of treatment options to salvage patients during catastrophic haemoptysis at rigid bronchoscopy

Depression is considered to be a major suicide precursor: An estimated 50 % of those who die through suicide have suffered from depression (Isometsä et al., 1998). Among those ever hospitalized for depression the percentage who will die by suicide is estimated to be 15–19 % (Guze & Robbins, 1970; Goodwin & Jamison, 1990). Lower figures are reported for depressed outpatient populations (Bost-wick & Pankratz, 2000). The rate of attempted suicide in depression, though not exactly known, is much higher. A major strategy in the treatment of depression, both major depression and dysthymia, is the prescription of anti-depressant drugs. The use of those drugs has risen substan-tially over the years. In The Netherlands, for instance, the increase was 12 % yearly over the past 4 years. Of course, antidepressants are also used in other conditions, but depres-

hemorrhage during percutaneous radiofrequency ablation: a more frequent complication than assumed?