Sorry, I can ony answer you the first question (biology isn't my science, any other but not that one, lol) Dr. rer. nat = Doktor rerum naturalium = He's got a doctor in nature science (so like biology... as he should, lol) Dr. Med. Hab. = Doktor Medizin habilitation = Habitilation is the highest university graduation you can get, with it you got the right to teach in university (if I remember it's meaning correctly)

1) They are titles, keep them in the translation. Niklas has explained them. Karl is a German first name. 2) No interactions (in the sense of negative interactions if you take two medical substances at once) are known besides those that have been confirmed with Lecithines (卵磷脂) 3) Main structure: Da die Fettsäuren die Oberfläche der Lipidmonolayer vergrößern. Because the polysaturated fatty acids connected to that (whatever was mentioned in the sentence before) enlarge the surface of the fatty monolayer of the HDL (high density lipoprotein, 高密度脂蛋白) particles to a greater extent compared to monounsaturated resp. saturated phosphatidylcholines (磷脂酰胆碱), the reason being their larger steric (related to the spatial arrangement of atoms in a molecule coupled with the fact that every atom needs some space. E.g. steric hindrance = 位阻效应, so it's got probably a 位 in the chinese word. :-)) footprint, ... (second part of sentence)