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  1. Marine protists - Wikipedia › wiki › Marine_protists

    5 days ago · Marine protists are defined by their habitat as protists that live in marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. Life originated as single-celled prokaryotes (bacteria and archaea) and later evolved into more complex eukaryotes .

  2. Marine microorganisms - Wikipedia › wiki › Marine_microorganism

    6 days ago · The tiny (0.6 µm) marine cyanobacterium Prochlorococcus, discovered in 1986, forms today an important part of the base of the ocean food chain and accounts for much of the photosynthesis of the open ocean and an estimated 20% of the oxygen in the Earth's atmosphere.

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    How are marine protists defined by their habitat?

    Are there any protists in the deep sea?

    Which is the most abundant organism in the sea?

    Where are marine viruses found in the ocean?

  4. Marine food web - Wikipedia › wiki › Marine_food_webs

    May 25, 2021 · Marine cyanobacteria include the smallest known photosynthetic organisms. The smallest of all, Prochlorococcus, is just 0.5 to 0.8 micrometres across. In terms of individual numbers, Prochlorococcusis possibly the most plentiful species on Earth: a single millilitre of surface seawater can contain 100,000 cells or more.

  5. Marine viruses - Wikipedia › wiki › Marine_viruses

    6 days ago · By 2015, about 40 viruses affecting marine protists had been isolated and examined, most of them viruses of microalgae. The genomes of these marine protist viruses are highly diverse. Marine algae can be infected by viruses in the family Phycodnaviridae. These are large (100–560 kb) double-stranded DNA viruses with icosahedral shaped capsids.

  6. Marine prokaryotes - Wikipedia › wiki › Marine_bacteria

    May 27, 2021 · Marine prokaryotes are marine bacteria and marine archaea. They are defined by their habitat as prokaryotes that live in marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. All cellular life forms can be divided into prokaryotes and eukaryotes.

  7. Marine life - Wikipedia › wiki › Marine_animal

    Jun 06, 2021 · Marine microorganisms, including protists, bacteria and viruses, have been variously estimated as constituting about 70% or about 90% of the total marine biomass. Marine life is studied scientifically in both marine biology and in biological oceanography .

  8. Microorganism - Wikipedia › wiki › Microbe

    6 days ago · A cluster of Escherichia coli bacteria magnified 10,000 times. A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or a colony of cells . The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from 6th century BC India.

  9. Microalgae — Wikipedia Republished // WIKI 2 › en › Microalgae
    • Characteristics and Uses
    • Cultivation of Microalgae
    • External Links

    The chem­i­cal com­po­si­tion of mi­croal­gae is not an in­trin­sic con­stant fac­tor but varies over a wide range of fac­tors, both de­pend­ing on species and on cul­ti­va­tion con­di­tions. Some mi­croal­gae have the ca­pac­ity to ac­cli­mate to changes in en­vi­ron­men­tal con­di­tions by al­ter­ing their chem­i­cal com­po­si­tion in re­sponse to en­vi­ron­men­tal vari­abil­ity. A par­tic­u­larly dra­matic ex­am­ple is their abil­ity to re­place phos­pho­lipids with non-phos­pho­rus mem­brane lipids in phos­pho­rus-de­pleted environments. It is pos­si­ble to ac­cu­mu­late the de­sired prod­ucts in mi­croal­gae to a large ex­tent by chang­ing en­vi­ron­men­tal fac­tors, like tem­per­a­ture, il­lu­mi­na­tion, pH, CO2sup­ply, salt and nu­tri­ents. Mi­cro­phytes also pro­duce chem­i­cal sig­nals which con­tribute to prey se­lec­tion, de­fense, and avoid­ance. These chem­i­cal sig­nals af­fect large scale tropic struc­tures such as algal blooms but prop­a­gate by sim­ple dif­fu­sion a...

    A range of mi­croal­gae species are pro­duced in hatch­eries and are used in a va­ri­ety of ways for com­mer­cial pur­poses, in­clud­ing for human nu­tri­tion, as bio­fuel, in the aqua­cul­ture of other organisms, in the man­u­fac­ture of phar­ma­ceu­ti­cals and cos­met­ics, and as biofer­tiliser.How­ever, the low cell den­sity is a major bot­tle­neck in com­mer­cial vi­a­bil­ity of many mi­croal­gae de­rived prod­ucts, es­pe­cially low cost commodities. Stud­ies have es­ti­mated the main fac­tors in the suc­cess of a mi­croal­gae hatch­ery sys­tem to be: 1. the dimensions of the container/bioreactor where microalgae is cultured; 2. exposure to light/irradiation; and 3. concentration of cells within the reactor.

    "From Micro-Algae to Blue Oil", ParisTech Review, Dec. 2011
  10. Eukaryote - Wikipedia › wiki › Eucaryote

    May 22, 2021 · For the journal, see Eukaryotic Cell (journal). Eukaryotes ( / juːˈkærioʊts, - əts /) are organisms whose cells have a nucleus enclosed within a nuclear envelope. Eukaryotes belong to the domain Eukaryota or Eukarya; their name comes from the Greek εὖ ( eu, "well" or "good") and κάρυον ( karyon, "nut" or "kernel").

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