Within most types of eukaryotic CELL NUCLEUS, a distinct region, not delimited by a membrane, in which some species of rRNA (RNA, RIBOSOMAL) are synthesized and assembled into ribonucleoprotein subunits of ribosomes. In the nucleolus rRNA is transcribed from a nucleolar organizer, i.e., a group of tandemly repeated chromosomal genes which encode rRNA and which are transcribed by RNA polymerase I. (Singleton & Sainsbury, Dictionary of Microbiology & Molecular Biology, 2d ed)
Cell organelles -- Formation -- Congresses. : Biological chemistry of organelle formation / 31. Colloquium der Gesellschaft für Biologische Chemie, 14.-19. April 1980 in Mosbach/Baden ; edited by Th. Bücher, W. Sebald, H. Weiss
A type of MICROCOMPUTER, sometimes called a personal digital assistant, that is very small and portable and fitting in a hand. They are convenient to use in clinical and other field situations for quick data management. They usually require docking with MICROCOMPUTERS for updates
Cell phone equipment industry -- History : Cellular : an economic and business history of the international mobile-phone industry / Daniel D. Garcia-Swartz and Martin Campbell-Kelly