23 August 2011

red algae

Red Algae

Scientific classificationDomain: Eukaryotes(Not included) ArchaeplastidaPhylum: RhodophytaWettstein, 1922possibility of class

Red algae or Rhodophyta are one phylum of algae based dyes or pigmentasinya. The red color of algae is caused by pigment fikoeritrin in large quantities compared to the pigment chlorophyll, carotene, and xantofil.
Algae are generally many cells (multicellular) and macroscopic. The length between 10 cm to 1 meter and shaped beam or a sheet.
Some red algae have economic value as a foodstuff (as a supplement beverages or as raw material for gelatin). Red algae as a food ingredient has a soft fiber that is good for intestinal health. 
Most of the red algae live in the sea, numerous in tropical seas. Small fraction live in fresh water that flows swift and cold with lots of oxygen. In addition there is also live in brackish water. Red algae which are found in the deep ocean is Gelidium and Gracilaria, are Euchema spinosum like a shallow sea. 
Red algae reproduce vegetatively and generative.

Vegetative propagation of red algae takes place with the formation of haploid spores produced by a sporangium or talus diploid algae. These spores then grow into a male or female algae are haploid cells.
Generative proliferation of red algae with Oogami, fertilization of the female sex cell (ovum) by the male sex cells (spermatium). Male breeding tool called spermatogonia that produce no berflagel spermatium. While the female genitals are called karpogonium, which produces ova. Fertilized ovum by a diploid zygote spermatium is. Subsequently, the zygote that will grow into a new algae that produces aplanospora with meiosis. Haploid spores will grow into gamete-producing algae. So the red algae occur rotation between sporophytes and gametophyte offspring.
Red algae can provide food in large quantities for fish and other animals that live in the sea. This species is also into food for humans such as Chondrus crispus (Irish moss) and several genera porphyra. Chondrus crispus and Gigortina mamilosa produce karagen used for tanning leather, fabric cream, shampoo and medicine. Other red algae such as Gracilaria lichenoides, Euchema spinosum, Gelidium and Agardhiella cultivated because it produces a similar gelatinous material known as agar-agar. The gel is used by researchers as a bacterial culture medium and the solid phase in gel electrophoresis, to thickener in many foods, textile sizing, as a laxative (laxative), or as a dessert.

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