2018年5月23日 · Diatoms belong to the taxonomic phylum Bacillariophyta. There are approximately 10, 000 known diatom species. Of all algae phyla, diatom species are the most numerous. Diatoms frustules are used to differentiate species. Diatom frustules are composed of very pure hydrated silica within a layer of organic, carbon containing material.

2018年5月18日 · Most diatoms are unicellular, but some are colonial or filamentous. Most are photosynthetic, but some species lack chlorophyll and live heterotrophically among decaying marine algae. Pennate (i.e. bilaterally symmetrical) diatoms occur in both freshwater and marine habitats; centric diatoms (i.e. radially symmetrical) occur predominantly as ...

2018年6月11日 · Bacillariophyta A phylum of algae comprising the diatoms. These marine or freshwater unicellular organisms have cell walls (frustules) composed of pectin impregnated with silica and consisting of two halves, one overlapping the other. Diatoms are found in huge numbers in plankton and are important in the food chains of seas and rivers.

2018年6月8日 · Chrysophyta (krəsŏf´ətə), phylum (division) of unicellular marine or freshwater organisms of the kingdom Protista [1] consisting of the diatoms [2] (class Bacillariophyceae), the golden, or golden-brown, algae (class Chrysophyceae), and the yellow-green algae [3] (class Xanthophyceae).

A small particle feeder that feeds in near-surface coastal waters, generates water currents by the slow swimming movements of antennae and maxillipeds and captures food particles in laminar flow fields. Omnivorous, with diet including wide range of minute unicellular phytoplankton such as diatoms, dinoflagellates, ciliates, and tintinnids.

Cladocera(Water fleas) Phylum ArthropodaSubphylum CrustaceaClass BranchiopodaOrder CladoceraNumber of families 15Thumbnail description Small transparent zooplankton found in bodies of freshwater throughout the world; a few species inhabit marine waters Source for information on Cladocera (Water Fleas): Grzimek's Animal Life Encyclopedia dictionary.

The usual method of preparation involves the addition of lime (calcium oxide; CaO) to diatomaceous earth, a material consisting of the fossil remains of single-celled algae known as diatoms. The lime provides the calcium and the diatomaceous earth provides the silicon dioxide (SiO 2 ) required to make calcium silicate.

Marine halfbeaks, on the other hand, tend to feed on algae, diatoms, and sea grasses, though some species eat small fishes. Planktivorous marine beloniforms include the flyingfishes and sauries. Ricefishes are omnivorous and will eat plankton, small insects, detritus, and plant material. Beloniformes themselves often fall prey to larger fishes.

2018年5月18日 · Many are unicellular, including most euglenoids (phylum Euglenophyta) and dinoflagellates (Dinophyta), and some diatoms (Bacillariophyta) and green algae (Chlorophyta). These, along with the cyanobacteria (often misleadingly called blue- green algae ), form the phytoplankton of aquatic ecosystems .

2018年5月9日 · Diatomaceous earth is formed by the fossil remains of a single-celled plankton called diatoms, and the result is an absorbent material which "soaks up" the nitroglycerin. Alfred named the product "dynamite" — derived from the Greek "dynamis" meaning "power"-— and received a patent for the process in 1867. Nobel went on to develop several ...