Why do mature diatoms undergo vegetative cell division?

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Discussion Overview

The discussion centers around the concept of "vegetative cell division" in mature diatoms, exploring its definition, implications, and comparisons to other forms of cell division. Participants examine the biological processes involved and the potential reasons for size reduction in diatom cells during this division.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the meaning of "vegetative cell division" and seeks clarification on its definition.
  • Another participant suggests that "vegetative division" refers to mitotic cell division, contrasting it with meiotic divisions that produce germ cells.
  • It is noted that diatom cells may shrink due to rapid division rather than growing significantly before dividing, drawing a parallel to animal embryonic development.
  • A participant introduces the concept of amitosis, describing it as an asymmetric cell division that occurs in some unicellular organisms, though its relevance to diatoms is unclear.
  • There is uncertainty regarding the term "shrinking," with one participant questioning how it relates to the size of the resulting cells post-division.

Areas of Agreement / Disagreement

Participants express differing interpretations of "vegetative cell division" and its implications, indicating that multiple competing views remain regarding the processes and definitions involved.

Contextual Notes

There are limitations in the discussion regarding the specific mechanisms of cell division in diatoms and the definitions of terms used, which may vary across different biological contexts.

Who May Find This Useful

This discussion may be of interest to those studying cell biology, particularly in the context of unicellular organisms, as well as researchers exploring diatom biology and their reproductive strategies.

Stephen Tashi
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This page indicates that mature diatoms begin to shrink as they age due to "vegetative cell division". http://www.sciencebythesea.org/SciencebytheSea.org/TAS-2014_Log/Entries/2014/7/10_Can_Diatoms_Iron-Out_Their_Differences_2.html What kind of cell division is "vegetative cell division"?
 
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Although "vegetative division" can have different meanings in difference contexts, in your link it seems to mean just mitotic (normal cell division) as distinct from meiotic divisions, which reduce the number of chromosomes by half to make germ cells.
From the link, it seems the cells just get smaller because they are dividing rapidly instead of growing 2x in size before dividing again.
Animal embryos often do this after fertilization (in the blastula stage) to make many small cells from the large fertilized egg.
 
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From what I understand cells of animals divide with (till?) Specialisation of stem cells which are triggered by hormone receptors based on proximity.
 
Amitiosis. It is an asymmetric cell division that occurs rarely in some unicellular and acellular organisms.

Not sure what is meant by "shrinking", but one cell is going to be smaller, so?
 

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