#$agent -> get ('http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?CMD=search&DB=pubmed/');
my $Suchbegriff = 'SIDA';
$agent -> get ('http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Search&db=pubmed&term=' . $Suchbegriff);