frustule การใช้

• The zygote is then becomes an auxospore, which has no rigid frustule.
• A frustule is usually composed of two identically shaped but slightly differently sized thecae.
• Once each cell is completely separate they then have similar protection and the ability to continue frustule production.
• As the diatom divides, each daughter retains one theca of the original frustule and produces one new theca.
• Their distinguishing feature is a hard mineral shell or frustule composed of opal ( hydrated, polymerized silicic acid ).
• Some polyps can asexually produce a creeping " frustule " larval form, which then develops into another polyp.
• The frustule's structure is usually composed of two overlapping sections known as thecae ( or less formally as valves ).
• The frustule also contains many pores and slits that provide the diatom access to the external environment for processes such as waste removal and mucilage secretion.
• Diatom cells are contained within a unique silica cell wall known as a frustule made up of two valves called thecae, that typically overlap one another.
• This is used by each daughter cell as the larger frustule ( or epitheca ) into which a second, small frustule ( or hypotheca ) is constructed.
• This is used by each daughter cell as the larger frustule ( or epitheca ) into which a second, small frustule ( or hypotheca ) is constructed.
• Diatoms build a frustule from silica extracted from the surrounding water; radiolarians, foraminiferans, testate amoebae and silicoflagellates also produce a skeleton from minerals, called lorica.
• Diatoms are traditionally divided into two main groups that are primarily distinguished by frustule structures : the "'centrics "'and the "'pennates " '.
• This form of division results in a size reduction of the daughter cell that received the smaller frustule from the parent and therefore the average cell size of a diatom population decreases, until the cells are about one-third their maximum size.