منابع مشابه
Cell division in two large pennate diatoms Hantzschia and Nitzschia III. A new proposal for kinetochore function during prometaphase
Prometaphase in two large species of diatoms is examined, using the following techniques: (a) time-lapse cinematography of chromosome movements in vivo; (b) electron microscopy of corresponding stages: (c) reconstruction of the microtubules (MTs) in the kinetochore fiber of chromosomes attached to the spindle. In vivo, the chromosomes independently commence oscillations back and forth to one po...
متن کاملUltrastructure and Membrane Traffic During Cell Division in the Marine Pennate Diatom Phaeodactylum tricornutum
The marine pennate diatom Phaeodactylum tricornutum has become a model for diatom biology, due to its ease of culture and accessibility to reverse genetics approaches. While several features underlying the molecular mechanisms of cell division have been described, morphological analyses are less advanced than they are in other diatoms. We therefore examined cell ultrastructure changes prior to ...
متن کاملInvestigating the Uptake of Inorganic Particulate Iron for the Pennate Diatoms Phaedactylum tricornutum and Thalassiosira pseudonana
Currently, bioavailable iron (Fe) controls CO 2 uptake in about half of the world's oceans. Furthermore, Fe fluxes to Fe-limited regions have been responsible for phytoplankton blooms and global cooling in the geologic past. The uptake process of Fe from fluxes of various speciation and solubility is not well known, but highly critical. The study of inorganic particulate Fe and its interactions...
متن کاملJudging Diatoms by Their Cover: Variability in Local Elasticity of Lithodesmium undulatum Undergoing Cell Division
Unique features of diatoms are their intricate cell covers (frustules) made out of hydrated, amorphous silica. The frustule defines and maintains cell shape and protects cells against grazers and pathogens, yet it must allow for cell expansion during growth and division. Other siliceous structures have also evolved in some chain-forming species as means for holding neighboring cells together. C...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1991
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.56.309