Zeitschrift 265 Mathematics 212 Science 138 Biology 136 Chemistry 120 Research 107 Physics 102 Biochemistry 91 Pe ́riodiques 88 Geology 74 Mathe ́matiques 72 Molecular Biology 71 Botany 69 Online-Ressource 66 Zoology 60 Ecology 56 Microbiology 56 Plants 55 Biologie 54 Molecular biology 54 Cytology 53 Data processing 50 Physiology 47 Natuurkunde 44 Biochimie 43 Physique 42 Sciences 42 Wiskunde 42 Earth sciences 41 Study and teaching 41