Desmidium

Desmidium
Desmidium swartzii
Scientific classification Edit this classification
Clade: Viridiplantae
(unranked): Charophyta
Class: Zygnematophyceae
Order: Desmidiales
Family: Desmidiaceae
Genus: Desmidium
Species

(more)

Desmidium is a genus of green algae, specifically of the Desmidiaceae.[1]

Morphology

Desmidium is one of the filamentous desmid genera characterized by rather firm intercellular connections. Cells connect to adjoining cells at the flat, apical face of the cells. The cells can be longer or shorter than wide. A median constriction of the cells may appear either as distinct or faint. Desmidium cell walls are smooth with multiple side-by-side or scattered pores. Every semicell contains one stellate chloroplast. Typically cells are oval in shape or have a three to five angle. Angles of the cell are often off-balance on each semicell. This creates a helical shape of angles throughout the filament. Cells may have either a pyrenoid (transparent structure) in each of its lobes or a single pyrenoid in the middle of the cell. The nucleus is found in the conjoined area of semicells (isthmus). After cell division daughter cells stick together so that the filament in question increases in length. Moreover, cell filaments are markedly twisted, to be seen from a gradual shift in position of the cellular lobe facing the observer. In case of conjugation (almost) all cells in the paired filaments are sexually activated, resulting in a series of zygospores coupling the empty cell filaments

  • The genus name of Desmidium - derived from the Greek word 'desmos' (= ribbon, chain or bond) - presumably gave rise to the family name of Desmidiaceae.

References

  1. ^ See the NCBI webpage on Desmidium. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.


Stub icon

This green algae-related article is a stub. You can help Wikipedia by expanding it.

Read other articles:

Periodo Yayoi

Il periodo Yayoi (弥生時代?, Yayoi-jidai) è un'epoca nella storia del Giappone che va dal 400-300 a.C. al 250-300 d.C.,[1] attraversando il Neolitico, l'età del bronzo e l'età del ferro. Il suo nome deriva dal quartiere di Tokyo dove furono per la prima volta ritrovati resti archeologici di quell'era. A seconda della fonte che si prende in considerazione il periodo Yayoi viene fatto iniziare o con l'inizio della coltivazione del riso nelle risaie oppure con il ritrovamento di n...

 

 

Pompei

City in Campania, southern Italy This article is about the modern Italian city. For the ancient Roman city, see Pompeii. For the Classical Roman leader, see Pompey. For the Pacific island, see Pohnpei. For other uses, see Pompeii (disambiguation). Comune in Campania, ItalyPompeiComune FlagCoat of armsLocation of Pompei PompeiLocation of Pompei in ItalyShow map of ItalyPompeiPompei (Campania)Show map of CampaniaCoordinates: 40°44′57″N 14°30′02″E / 40.74917°N 14.50056...

 

 

Society for American Baseball Research

American baseball research organization This article is about the baseball history organization. For baseball statistical analysis, see Sabermetrics. For other uses, see SABR (disambiguation). Society for American Baseball ResearchAbbreviationSABRFormationAugust 10, 1971; 52 years ago (1971-08-10)FounderBob DavidsFounded atCooperstown, New York, U.S.Headquarters555 N Central Ave #416Phoenix, Arizona, U.S.FieldBaseball researchMembership (2022) 7,194[1]CEOScott BushPr...

Mazraat el Daher

City in Mount Lebanon GovernorateMazraat el Daher Arabic: مزرعة الضهرCityMazraat el DaherLocation within LebanonCoordinates: 33°35′N 35°30′E / 33.583°N 35.500°E / 33.583; 35.500Country LebanonGovernorateMount Lebanon GovernorateDistrictChouf DistrictGovernmentElevation750 m (2,460 ft)Time zoneUTC+2 (EET) • Summer (DST)UTC+3 (EEST)Dialing code+961 Mazraat el Daher (Arabic: مزرعة الضهر) also spelled Maraat el Dahr, i...

 

 

Синелобый амазон

Синелобый амазон Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:ЗавропсидыКласс:Пт�...

 

 

High Rock Canyon Wilderness

Protected area in Nevada, United States High Rock CanyonIUCN category Ib (wilderness area)[1]Hikers in High Rock CanyonLocation in United StatesShow map of the United StatesLocation of High Rock Canyon Wilderness in Nevada[2]Show map of NevadaLocationBlack Rock Desert, Nevada, United StatesCoordinates41°23′8.628″N 119°27′17.715″W / 41.38573000°N 119.45492083°W / 41.38573000; -119.45492083Elevation1,743 m (5,719 ft)Established2000Op...

FIFA Series

An editor has performed a search and found that sufficient sources exist to establish the subject's notability. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: FIFA Series – news · newspapers · books · scholar · JSTOR (March 2024) (Learn how and when to remove this message) For the video game series, see FIFA (video game series). Football tournamentFIFA SeriesOrgan...

 

 

Pierre Waldeck-Rousseau

Pour les articles homonymes, voir Waldeck-Rousseau, Waldeck et Rousseau. Ne doit pas être confondu avec Waldeck Rochet. Pierre Waldeck-Rousseau Pierre Waldeck-Rousseau(photographié par Eugène Pirou). Fonctions Président du Conseil des ministres françaisMinistre de l'Intérieur et des Cultes 22 juin 1899 – 7 juin 1902(2 ans, 11 mois et 16 jours) Président Émile Loubet Gouvernement Waldeck-Rousseau Législature VIIe Prédécesseur Charles Dupuy Successeur Émile Combes ...

 

 

大字 (数字)

この項目には、一部のコンピュータや閲覧ソフトで表示できない文字が含まれています（詳細）。 数字の大字（だいじ）は、漢数字の一種。通常用いる単純な字形の漢数字（小字）の代わりに同じ音の別の漢字を用いるものである。 概要 壱万円日本銀行券（「壱」が大字） 弐千円日本銀行券（「弐」が大字） 漢数字には「一」「二」「三」と続く小字と、「壱」「�...

Singapore Airlines

Pour les articles homonymes, voir SIA. Singapore Airlines A great way to flyCodes IATAOACIIndicatif d'appel SQ SIA SINGAPORE Repères historiques Date de création 1947 (Sous le nom de Malayan Airways) Généralités Basée à Aéroport international de Singapour-Changi Programme de fidélité KrisFlyer Alliance Star Alliance Taille de la flotte 142 Nombre de destinations 137 Siège social Singapour Société mère Temasek Holdings Filiales ScootSilkAirSIA Engineering CompanySingapore Airlin...

 

 

1998–99 North Carolina Tar Heels men's basketball team

American college basketball season 1998–99 North Carolina Tar Heels men's basketballNCAA tournament, Round of 64ConferenceAtlantic Coast ConferenceRankingCoachesNo. 18APNo. 13Record24–10 (10–6 ACC)Head coachBill Guthridge (2nd season)Assistant coaches Phil Ford (11th season) Dave Hanners (9th season) Pat Sullivan (2nd season) Home arenaDean Smith CenterSeasons← 1997–981999–2000 → 1998–99 ACC men's basketball standings vte Conf Overall Team...

 

 

Auguste Vallet de Viriville

Pour les articles homonymes, voir Vallet. Auguste Vallet de VirivilleAuguste Vallet de Viriville,atelier Nadar, Paris, BnF, département des estampes et de la photographie.BiographieNaissance 23 avril 1815ParisDécès 20 février 1868 (à 52 ans)11e arrondissement de ParisNationalité françaiseFormation École nationale des chartesActivités Archiviste, historienAutres informationsA travaillé pour École nationale des chartesMembre de Société de l'École des chartesComité des ...

Nethy Bridge

Human settlement in ScotlandNethy BridgeScottish Gaelic: Cinn DrochaidNethy BridgeLocation within the Badenoch and Strathspey areaPopulation680 (mid-2020 est.)[1]Council areaHighlandCountryScotlandSovereign stateUnited KingdomPost townNethy BridgePostcode districtPH25Dialling code01479PoliceScotlandFireScottishAmbulanceScottish UK ParliamentInverness, Nairn, Badenoch and StrathspeyScottish ParliamentInverness and Nairn List of places UK Scotlan...

 

 

Second Johnson ministry

Government of the UK (2019–2022) This article is about the people in Boris Johnson's government. For the events of Boris Johnson's tenure as Prime Minister, see Premiership of Boris Johnson. Second Johnson ministryCabinet of the United Kingdom2019–2022The Johnson Cabinet's first meeting after the 2019 general electionDate formed16 December 2019Date dissolved6 September 2022People and organisationsMonarchElizabeth IIPrime MinisterBoris JohnsonPrime Minister's history2019–2022Deputy Prime...

 

 

Stanford Super Series

Stanford Super SeriesCountries Antigua and BarbudaFormatTwenty20Tournament formatOne off match with warm upsNumber of teams4 The Stanford Super Series was a series of Twenty20 cricket matches in 2008, sponsored by Allen Stanford. The main game of the Series matched the English national cricket team against an all-star team from the Caribbean, called the Stanford Superstars. The prize money awarded in the tournament was winner-take-all; the players for the winning team in the yearly game took...

一中同表

一中同表，是台灣处理海峡两岸关系问题的一种主張，認為中华人民共和国與中華民國皆是“整個中國”的一部份，二者因為兩岸現狀，在各自领域有完整的管辖权，互不隶属，同时主張，二者合作便可以搁置对“整个中國”的主权的争议，共同承認雙方皆是中國的一部份，在此基礎上走向終極統一。最早是在2004年由台灣大學政治学教授張亞中所提出，希望兩岸由一中各表�...

 

 

Somerley Mill, Earnley

Earnley WindmillThe mill in 2005OriginMill nameSomerley MillMill locationSZ 817 983Coordinates50°46′44″N 0°50′35″W / 50.779°N 0.843°W / 50.779; -0.843Operator(s)PrivateYear builtc1803InformationPurposeCorn millTypeSmock millStoreysThree-storey smockBase storeysSingle-storey baseSmock sidesEight sidesNo. of sailsFour sailsType of sailsTwo Spring sails and two Common sailsWindingFantailAuxiliary powerEngineNo. of pairs of millstonesTwo pairs, a third pair dr...

 

 

جيانغ نينغ

جيانغ نينغ معلومات شخصية الميلاد 1 سبتمبر 1986 (العمر 37 سنة)[1]تشينغداو  الطول 1.80 م (5 قدم 11 بوصة)[2][2] مركز اللعب نصف الجناح  الجنسية الصين  معلومات النادي النادي الحالي كينغداو جونون الرقم 21 مسيرة الشباب سنوات فريق 1997–2003 كينغداو جونون المسيرة الاحت�...

Frecciargento

Voce principale: Le Frecce. Questa voce o sezione sull'argomento trasporto pubblico non cita le fonti necessarie o quelle presenti sono insufficienti. Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. Segui i suggerimenti del progetto di riferimento. FrecciargentoServizio di trasporto pubblicoETR.485 FrecciargentoStati Italia Apertura2008  GestoreTrenitalia ClassificazioneAV FA / FA Mezzi utilizzatiETR 485  ...

 

 

Huasca de Ocampo

Town & Municipality in Hidalgo, MexicoHuascaTown & MunicipalityHuasca de OcampoStreetview looking towards parish church SealLocation of the municipality of Huasca de Ocampo in Hidalgo.HuascaCoordinates: 20°12′10″N 98°34′33″W / 20.20278°N 98.57583°W / 20.20278; -98.57583Country MexicoStateHidalgoFounded18th centuryMunicipal Status1864Government • Municipal PresidentÁlvaro López VacaElevation (of seat)2,100 m (6,900...