Science 313 Mathematics 311 Zeitschrift 279 Research 201 Biology 164 Study and teaching 139 Chemistry 134 Physics 131 Ciencia 129 Philosophy 98 Biochemistry 97 Pe ́riodiques 93 Geology 89 Botany 86 Ecology 77 Molecular Biology 75 Mathe ́matiques 72 Filosofía 69 Online-Ressource 69 Zoology 67 History 64 Training of 63 Biologie 61 Microbiology 61 Plants 61 Cytology 58 Methodology 58 Computers 55 Matemáticas 55 Data processing 54