frustule

Once each cell is completely separate they then have similar protection and the ability to continue frustule production.

Its frustule is a form of armor that can protect the diatoms from predators.

A frustule is the hard and porous cell wall or external layer of diatoms.

This forms the center of the pattern and silica deposition can continue outward from that point, till the frustule is produced.

Just how much protection the typical diatom frustule offers has been determined by scientists in Germany, who performed load tests on several species.

A frustule is usually composed of two identically shaped but slightly differently sized thecae.

Some polyps can also asexually produce a creeping frustule larval form, which then also develops into a new polyp.

Genetically it is closely related to diatoms, but differs morphologically from them, lacking the silica frustule characteristic of diatoms.

Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms (frustule).

The margins of the two thecae are covered by a connecting band called a cingulum and all together are referred to as a frustule.

The silica skeleton of a diatom cell (called the frustule) consists of an epitheca and an hypotheca.

Like most marine diatoms, C. pseudocurvisetus is characterized by its frustule, or cell wall, which is composed of silicon dioxide and other organic matter.

Diatoms are golden-brown algae that construct an opaline silica microscopic shell that is known as a "frustule".

A unique feature of diatom cells is that they are encased within a cell wall made of silica (hydrated silicon dioxide) called a frustule.

Diatoms build a frustule from silica extracted from the surrounding water; radiolarians also produce a test from minerals.

As the diatom divides, each daughter retains one theca of the original frustule and produces one new theca.

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.

This is used by each daughter cell as the larger frustule (or epitheca) into which a second, small frustule (or hypotheca) is constructed.

This occurs because each daughter cell produced by cell division inherits one of the two valves that make up the frustule (a silica cell wall), and then grows a smaller valve within it.

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.

The basic structure of all diatoms is similar: a single cell, often with a large vacuole, contained within a silica shell or frustule made of two overlapping halves or valves joined by girdle bands, which are also made of silica.

The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred to in the early literature on diatoms as pectin, a fiber most commonly found in cell walls of plants.