In biology , a septum ( Latin for something that encloses ; pl. : septa ) is a wall, dividing a cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate .
11-486: [REDACTED] Look up roya in Wiktionary, the free dictionary. Roya may refer to: Roya (alga) , a genus of green algae and a subgroup of Zygnemataceae Roya (artist) , a Swedish electronic artist, producer and composer Roya (river) , a river of France and Italy Roya (gastropod) , a synonym of Williamia , a genus of small sea snails Roya (given name) ,
22-605: A family of filamentous or unicellular , uniseriate (unbranched) green algae . The filaments are septated and reproduction is by conjugation ; Spirogyra is commonly used in schools to demonstrate this kind of reproduction. The family is notable for its diversely shaped chloroplasts , such as stellate in Zygnema , helical in Spirogyra , and flat in Mougeotia . The Zygnemataceae are cosmopolitan, but though all generally occur in
33-567: A female proper name of Persian origin, meaning "fantasy" or "dream" Roya (singer) , an Azerbaijani pop singer Roya, Princess Samira’s pet peacock in Shimmer and Shine Roya TV , a private Jordanian television station Notable people with this name [ edit ] Roya Arab , UK-based Iranian musician and archaeologist Roya Hakakian , Iranian American Jewish poet, journalist, and writer Roya Heshmati , Kurdish-Iranian activist Roya Maboudian , American academic and researcher in
44-426: Is a stub . You can help Misplaced Pages by expanding it . Septum Histological septa are seen throughout most tissues of the body, particularly where they are needed to stiffen soft cellular tissue, and they also provide planes of ingress for small blood vessels. Because the dense collagen fibres of a septum usually extend out into the softer adjacent tissues, microscopic fibrous septa are less clearly defined than
55-618: The basal cells of the filament. The mat species rise to the surface in early spring, grow rapidly through the summer, disappearing by late summer. Members of the Zygnemataceae, such as Spirogyra , fall prey to parasites, especially chytrids . Most genera (all except Mesotanium and Spirotaenia ) previously assigned to Mesotaeniaceae as well as the Desmidiales actually emerged in the Zygnematacae. This green algae -related article
66-417: The field of chemical engineering Roya Megnot , American actress Roya Mirelmi , Iranian theater, cinema and television actress Roya Nonahali , Iranian actress and director Roya Rahmani , Afghan diplomat Roya Ramezani , Iranian designer and women's rights campaigner Roya Rozati , India-based gynecologist and infertility specialist Roya Saberi Negad Nobakht , Iranian-British housewife who
77-544: The macroscopic types of septa listed above. In rare instances, a septum is a cross-wall. Thus it divides a structure into smaller parts. The septum (cell biology) is the boundary formed between dividing cells in the course of cell division . A coral septum is one of the radial calcareous plates in the corallites of a coral . Annelids have septa that divide their coelom into segmented chambers. Many shelled organisms have septa subdividing their shell chamber, including rhizopods , cephalopods and gastropods ,
88-416: The same types of habitats, Mougeotia , Spirogyra , and Zygnema are by far the most common; in one study across North America, 95% of the Zygnemataceae collected were in these three genera. Classification and identification is primarily by the morphology of the conjugation, which is somewhat rare to find in natural populations of permanent water bodies; when in the vegetative state, the rarer genera resemble
99-481: The three most common, and are often mistaken for them and catalogued as such. Conjugation can be induced in low-nitrogen culture. While they occupy many habitats, in North America all are found solely in freshwater or subaerial habitats. Species typically exist as floating mats in stagnant water in ditches and ponds, but some also grow in moving water, attaching themselves to a substrate by rhizoid-like projections of
110-496: The title Roya . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Roya&oldid=1222396622 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Zygnemataceae Zygnemeae Kützing, 1843 The Zygnemataceae are
121-413: Was imprisoned after she returned to Iran Roya Sadat , Afghan film producer and director Roya Teymourian , Iranian actress Roya Toloui , Kurdish-Iranian journalist, human rights activist and feminist See also [ edit ] Roia (disambiguation) Royal (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
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