The cell in development and inheritance . and this in turn often contains Attraction-sphere enclosing two centrosomes. Nucleus -I Plasmosome or true nucleolus Chromatin- network Linin-network Karyosome,net-knot, orchromatin-nucleolus. Plastids lying in thecytoplasm Vacuole Passive bodies (meta-plasm or paraplasm)suspended in the cy-toplasmic meshwork Fig. 6.— Diagram of a cell. Its basis consists of a meshwork containing numerous minutegranules (microsomes) and traversing a transparent ground-substance. one or more smaller bodies or nucleoli. By some of the earlierworkers the nucleus was suppo
The cell in development and inheritance . and this in turn often contains Attraction-sphere enclosing two centrosomes. Nucleus -I Plasmosome or true nucleolus Chromatin- network Linin-network Karyosome,net-knot, orchromatin-nucleolus. Plastids lying in thecytoplasm Vacuole Passive bodies (meta-plasm or paraplasm)suspended in the cy-toplasmic meshwork Fig. 6.— Diagram of a cell. Its basis consists of a meshwork containing numerous minutegranules (microsomes) and traversing a transparent ground-substance. one or more smaller bodies or nucleoli. By some of the earlierworkers the nucleus was supposed to be, like the cell-wall, of sec-ondary importance, and many forms of cells were described as beingdevoid of a nucleus (cytodes of Haeckel). Nearly all later re-searches have indicated, however, that the characteristic nuclearmaterial, whether forming a single body or scattered in smallermasses, is always present, and that it plays an essential part in thelife of the cell. • Besides the presence of protoplasm and nucleus, no other struc-tural features of the cell are yet known to be of universal occurrence. ^ First described by Fontana in 1781, and recognized as a normal element of the cell byRobert Brown in 1833. GEN
Size: 1421px × 1759px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
