“Chlorophyta”的概念、定义、翻译、参考文献-科学参考

Chlorophyta

Biology

A large phylum (or group, i.e. the chlorophytes) comprising most of the green algae. They possess chlorophylls a and b, store food reserves as starch, and have cellulose cell walls. In these respects, and on the basis of molecular studies, they are now regarded as the sister group of the streptophytes (or charophytes), which includes the land plants and certain freshwater algae, i.e. the stoneworts and choleochaetophytes. Chlorophytes are widely distributed and diverse in form. Unicellular forms may occur singly (sometimes with flagella for motility) or in colonies, while multicellular forms may be filamentous (e.g. Spirogyra) or platelike (e.g. Ulva).

Geology and Earth Sciences

Superdivision of algae which are typically green in colour. In common with land plants, green algae include chlorophylls a and b among their principal pigments, have cellulose as the main constituent of cell walls, and form food reserves of starch. Consequently it is believed that the ancestors of land plants must have belonged to this group. The organisms take many forms, ranging from unicellular to relatively complex multicellular plants. They are found today mainly in freshwater habitats and their distribution is cosmopolitan. They are known from the Precambrian onwards, and the earliest eukaryotes were probably of this taxon. Marine, lime-secreting green algae have contributed to algal limestone reefs since the Cambrian. Fossil genera include Palaeoporella (similar to modern Halimeda), and Coelosphaeridium (similar to modern Acetabularia). See also charophyceae.

单词	Chlorophyta
释义	Chlorophyta Biology A large phylum (or group, i.e. the chlorophytes) comprising most of the green algae. They possess chlorophylls a and b, store food reserves as starch, and have cellulose cell walls. In these respects, and on the basis of molecular studies, they are now regarded as the sister group of the streptophytes (or charophytes), which includes the land plants and certain freshwater algae, i.e. the stoneworts and choleochaetophytes. Chlorophytes are widely distributed and diverse in form. Unicellular forms may occur singly (sometimes with flagella for motility) or in colonies, while multicellular forms may be filamentous (e.g. Spirogyra) or platelike (e.g. Ulva). Geology and Earth Sciences Superdivision of algae which are typically green in colour. In common with land plants, green algae include chlorophylls a and b among their principal pigments, have cellulose as the main constituent of cell walls, and form food reserves of starch. Consequently it is believed that the ancestors of land plants must have belonged to this group. The organisms take many forms, ranging from unicellular to relatively complex multicellular plants. They are found today mainly in freshwater habitats and their distribution is cosmopolitan. They are known from the Precambrian onwards, and the earliest eukaryotes were probably of this taxon. Marine, lime-secreting green algae have contributed to algal limestone reefs since the Cambrian. Fossil genera include Palaeoporella (similar to modern Halimeda), and Coelosphaeridium (similar to modern Acetabularia). See also charophyceae.
随便看	Hipparchus of Nicaea (190–c.120) Hipparcos Hipparcos Catalogue Hippasus of Metapontum (6th) Hippias (c.485–415) Hippocamp hippocampus Hippocrates (5th) shielded twisted pair shielded twisted pair cable shielding shielding effectiveness(of a barrier or enclosure) shield volcano shift shift character shift counter shifting cultivation shift instruction shift keying shift lock shift operator shift-reduce parsing shift register shift-share analysis shift work