âI think weâve read every single book they have.â Mark chuckled. He still wasnât ready to put the children downâWill was hanging off of one hip, his hand on Markâs shoulder as he stoically looked down at Bridget, and Mabel had nuzzled into the crook of Markâs neck with a contented sigh.
Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. These frustules show a wide diversity in form, but are usually almost bilaterally symmetrical, hence the group name.
There are at least 100,000 species of diatoms, which makes them the most abundant photosynthetic group after the angiosperms. Diatoms, therefore occupy a central position in the control of marine resources, and for prediction of climatic change.inally, diatoms are the principal cause of âbiofoulingâ, because of their capacity to adhere to surfaces and to produce extracellular polymeric mucilaginous substances (EPS). The total direct costs of âantifoulingâ treatments in the world is estimated at 3 billion dollars.