A family of microscopic freshwater EUKARYOTA, commonly known as golden algae. They share many features with the BROWN ALGAE but are planktonic rather than benthic. Though most are photosynthetic, they are not considered truly autotrophic since they can become facultatively heterotrophic in the absence of adequate light. In this state they can feed on BACTERIA or DIATOMS.

Succession and regulation factors of small eukaryote community composition in a lacustrine ecosystem (Lake Pavin). (1/15)

The structure and dynamics of small eukaryotes (cells with a diameter less than 5 microm) were studied over two consecutive years in an oligomesotrophic lake (Lake Pavin in France). Water samples were collected at 5 and 30 m below the surface; when the lake was stratified, these depths corresponded to the epilimnion and hypolimnion. Changes in small-eukaryote structure were analyzed using terminal restriction fragment length polymorphism (T-RFLP) and cloning and sequencing of the 18S rRNA genes. Terminal restriction fragments from clones were used to reveal the dominant taxa in T-RFLP profiles of the environmental samples. Spumella-like cells (Chrysophyceae) did not dominate the small eukaryote community identified by molecular techniques in lacustrine ecosystems. Small eukaryotes appeared to be dominated by heterotrophic cells, particularly Cercozoa, which represented nearly half of the identified phylotypes, followed by the Fungi-LKM11 group (25%), choanoflagellates (10.3%) and Chrysophyceae (8.9%). Bicosoecida, Cryptophyta, and ciliates represented less than 9% of the community studied. No seasonal reproducibility in temporal evolution of the small-eukaryote community was observed from 1 year to the next. The T-RFLP patterns were related to bottom-up (resources) and top-down (grazing) variables using canonical correspondence analysis. The results showed a strong top-down regulation of small eukaryotes by zooplankton, more exactly, by cladocerans at 5 m and copepods at 30 m. Among bottom-up factors, temperature had a significant effect at both depths. The concentrations of nitrogenous nutrients and total phosphorus also had an effect on small-eukaryote dynamics at 5 m, whereas bacterial abundance and dissolved oxygen played a more important structuring role in the deeper zone.  (+info)

Evidence for geographic isolation and signs of endemism within a protistan morphospecies. (2/15)

The possible existence of endemism among microorganisms resulting from and preserved by geographic isolation is one of the most controversial topics in microbial ecology. We isolated 31 strains of "Spumella-like" flagellates from remote sampling sites from all continents, including Antarctica. These and another 23 isolates from a former study were characterized morphologically and by small-subunit rRNA gene sequence analysis and tested for the maximum temperature tolerance. Only a minority of the Spumella morpho- and phylotypes from the geographically isolated Antarctic continent follow the worldwide trend of a linear correlation between ambient (air) temperature during strain isolation and heat tolerance of the isolates. A high percentage of the Antarctic isolates, but none of the isolates from locations on all other continents, were obligate psychrophilic, although some of the latter were isolated at low ambient temperatures. The drastic deviation of Antarctic representatives of Spumella from the global trend of temperature adaptation of this morphospecies provides strong evidence for geographic transport restriction of a microorganism; i.e., Antarctic protistan communities are less influenced by transport of protists to and from the Antarctic continent than by local adaptation, a subtle form of endemism.  (+info)

Chloroplast His-to-Asp signal transduction: a potential mechanism for plastid gene regulation in Heterosigma akashiwo (Raphidophyceae). (3/15)

BACKGROUND: Maintenance of homeostasis requires that an organism perceive selected physical and chemical signals within an informationally dense environment. Functionally, an organism uses a variety of signal transduction arrays to amplify and convert these perceived signals into appropriate gene transcriptional responses. These changes in gene expression serve to modify selective metabolic processes and thus optimize reproductive success. Here we analyze a chloroplast-encoded His-to-Asp signal transduction circuit in the stramenopile Heterosigma akashiwo (Hada) Hada ex Y. Hara et Chihara [syn. H. carterae (Hulburt) F.J.R. Taylor]. The presence, structure and putative function of this protein pair are discussed in the context of their evolutionary homologues. RESULTS: Bioinformatic analysis of the Heterosigma akashiwo chloroplast genome sequence revealed the presence of a single two-component His-to-Asp (designated Tsg1/Trg1) pair in this stramenopile (golden-brown alga). These data represent the first documentation of a His-to-Asp array in stramenopiles and counter previous reports suggesting that such regulatory proteins are lacking in this taxonomic cluster. Comparison of the 43 kDa H. akashiwo Tsg1 with bacterial sensor kinases showed that the algal protein exhibits a moderately maintained PAS motif in the sensor kinase domain as well as highly conserved H, N, G1 and F motifs within the histidine kinase ATP binding site. Molecular modelling of the 27 kDa H. akashiwo Trg1 regulator protein was consistent with a winged helix-turn-helix identity - a class of proteins that is known to impact gene expression at the level of transcription. The occurrence of Trg1 protein in actively growing H. akashiwo cells was verified by Western analysis. The presence of a PhoB-like RNA polymerase loop in Trg1 and its homologues in the red-algal lineage support the hypothesis that Trg1 and its homologues interact with a sigma 70 (sigma70) subunit (encoded by rpoD) of a eubacterial type polymerase. Sequence analysis of H. akashiwo rpoD showed this nuclear-encoded gene has a well-defined 4.2 domain, a region that augments RNA polymerase interaction with transcriptional regulatory proteins and also serves in -35 promoter recognition. The presence/loss of the His-to-Asp pairs in primary and secondary chloroplast lineages is assessed. CONCLUSION: His-to-Asp signal transduction components are found in most rhodophytic chloroplasts, as well as in their putative cyanobacterial progenitors. The evolutionary conservation of these proteins argues that they are important for the maintenance of chloroplast homeostasis. Our data suggest that chloroplast gene transcription may be impacted by the interaction of the His-to-Asp regulator protein (which is less frequently lost than the sensor protein) with the RNA polymerase sigma70 subunit.  (+info)

Direct effects of UV-B radiation on the freshwater heterotrophic nanoflagellate Paraphysomonas sp. (4/15)

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Prymnesins: toxic metabolites of the golden alga, Prymnesium parvum Carter (Haptophyta). (5/15)

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Scent of danger: floc formation by a freshwater bacterium is induced by supernatants from a predator-prey coculture. (6/15)

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Intracellular uptake: a possible mechanism for silver engineered nanoparticle toxicity to a freshwater alga Ochromonas danica. (7/15)

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Utilizing the effective xanthophyll cycle for blooming of Ochromonas smithii and O. itoi (Chrysophyceae) on the snow surface. (8/15)

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Chrysophyta is an outdated and no longer widely used taxonomic grouping that was once used to classify certain types of algae. This group, also known as the golden-brown algae or golden algae, included several genera of unicellular and colonial organisms that contain yellow-brown pigments called xanthophylls and have two flagella for movement.

Modern molecular evidence has shown that Chrysophyta is not a natural group (monophyletic) and the organisms once classified within it are now placed in several different taxonomic groups, including the stramenopiles, alveolates, and rhizarians (SAR supergroup), haptophytes, and cryptomonads.

It is important to note that medical definitions focus on human health and disease-related topics, while Chrysophyta is a taxonomic category related to algae, which falls under the broader field of biology.

... or golden algae is a term used to refer to certain heterokonts. It can be used to refer to: Chrysophyceae (golden ... "Introduction to the Chrysophyta". Retrieved 2009-06-13. Margulis, L., J.O. Corliss, M. Melkonian, D.J. Chapman. Handbook of ... "Chrysophyta". Archived from the original on September 22, 2008. Retrieved 2009-06-13. Pascher A (1914). "Über Flagellaten und ... 1990). Chrysophyta has some characteristics which includes their possession of the photosynthetic pigments which are ...
Many of the chrysophyta precursor fossils entirely lacked any type of photosynthesis-capable pigment. The most primitive ... 1995). "Chrysophyta". Archived from the original on 2008-09-22. Retrieved 2009-06-13. Wikispecies has information related to ... The Chrysophyceae should not be confused with the Chrysophyta, which is a more ambiguous taxon. Although "chrysophytes" is the ... Springer-Science+Business Media, B. V. Round, F.E. (1986). The Chrysophyta - a reassessment. In: Chrysophytes: Aspects and ...
Many of the chrysophyta precursor fossils entirely lacked any type of photosynthesis-capable pigment. Most biologists believe ... Introduction to the Chrysophyta. Ucmp.berkeley.edu. Retrieved 2014-03-20. Introduction to the Prymnesiophyta. Ucmp.berkeley.edu ...
Division Chrysophyta, pp. 411-423. In: CRC Handbook of Microbiology, 2nd ed., vol. 2, Fungi, Algae, Protozoa, and Viruses, ed. ...
Pascher (1914) included the Heterokontae in the Chrysophyta. In 1930, Allorge renamed the group as Xanthophyceae. The monadoid ... placed in the division Chrysophyta: Order Heterochloridales (e.g., Chlorochromonas) Order Rhizochloridales (e.g., ...
Entwisle, Timothy John (1986). Taxonomic studies on Vaucheria (Vaucheriaceae, Chrysophyta) in South-Eastern Australia (Ph.D. ...
The microalgae in these marine environments can be categorized into four varieties-pyrrhophyta, chrysophyta, euglenophyta or ...
23 genera of phytoplankton have been found: fourteen genera of Chrysophyta, five of Cyanophyta and four of Chlorophyta. The ...
Chrysophyta) from the coastal water of Sind, Pakistan. Int J Phycol Phycochem 4(2): 209-220 (Pakistan). 239 Rizvi MA & Shameel ...
Pyrrophyta and Chrysophyta have been observed in the lake as well. The faunal species recorded are of terrestrial, aquatic and ...
Chrysophyta, Cercozoa), were found through the use of RNA-SIP. In cold-seep ecosystem, Lithodid crabs (Paralomis sp.), which ...
... the most abundant forms are protist skeletons or cysts from the Chrysophyta, Pyrrhophyta, Sarcodina, acritarchs and ...
Chrysophyta (brown) Oscillatoria borneti Pleurococcus Protococcus Scenedesmus quadricauda Selenastrum gracile Acinetobacter ...
Chrysophyta - 8 species, Cyanobacteria - 7 species, Cryptophyta - 6 species, Euglenophyta - 2 species. There are 20 taxa of ...
... the most abundant forms are protist skeletons or microbial cysts from the Chrysophyta, Pyrrhophyta, Sarcodina, acritarchs and ...
... the most abundant forms are protist skeletons or cysts from the Chrysophyta, Pyrrhophyta, Sarcodina, acritarchs and ...
Chrysophyta or golden algae is a term used to refer to certain heterokonts. It can be used to refer to: Chrysophyceae (golden ... "Introduction to the Chrysophyta". Retrieved 2009-06-13. Margulis, L., J.O. Corliss, M. Melkonian, D.J. Chapman. Handbook of ... "Chrysophyta". Archived from the original on September 22, 2008. Retrieved 2009-06-13. Pascher A (1914). "Über Flagellaten und ... 1990). Chrysophyta has some characteristics which includes their possession of the photosynthetic pigments which are ...
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Jelaskan persamaan dan perbedaan Chrysophyta, Pyrrophyta, Chlorophyta, Phaeophyta, dan Rhodophyta. ... Jelaskan persamaan dan perbedaan Chrysophyta, Pyrrophyta, Chlorophyta, Phaeophyta, dan Rhodophyta. Riski Ferdian April 05, 2020 ... Chrysophyta: uniseleuler dan multiseluler. ada flagel/tidak. *Pyrrophyta: memiliki flagel, uniseluler, dan memiliki dinidng sel ...
Effects of water soluble fraction of Bombay High crude oil and heavy duty marine diesel on the growth of a microalga were examined and compared. Most concentrations of the oil depressed the growth rate in Isochrysis sp. Marine diesel prevented the growth of the alga in a concentration above 10%, while crude oil at a similar concentration had little effect on the growth. Hydrocarbon would cause environmental damage through selective effects on natural biota in the marine environment ...
Chrysophyta. Dinobryon cylindricum var. alpinum. 1619.0. 545. 9. Cyanophyta. Chroococcus limneticus. 85.0. 546. ...
Chrysophyta - golden-brown algae, chrysophycophytes. Class. Chrysophyceae Order. Rhizochrysidales Family. Rhizochrysidaceae ...
Unrein F, Gasol JM, Massana R. Dinobryon faculiferum (Chrysophyta) in coastal Mediterranean seawater: presence and grazing ...
The Chrysophyta - a reassessment Frank E. Round; 2. Ultrastructure of the Chrysophyceae - phylogenetic implications and ...
Silica-scaled chrysophyceae and synurophyceae (Chrysophyta) from Nigeria, II. Lake Lekki. Trop. Freshwater Biol., 12-13: 99-103 ... Chrysophyta and Rhodophyta. A total of 129 species belonging to 64 genera were observed. Diatoms formed the most abundant group ...
The proportion of Chrysophyta also increased during the water transfer period, while the proportion of Bacillariophyta was ... In the whole water transfer cycle, eight phyla and 59 genera, including Cyanophyta, Bacillariophyta, Chrysophyta, Pyrrophyta, ...
A total of 109 taxa belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Dinophyta, Xantophyta, Chrysophyta and Cryptophyta ...
Apakah Navicula termasuk Chrysophyta?. Navicula adalah salah satu anggota daru Chrysophyta berfungsi sebagai membentuk tanah ... Apa yang dimaksud Chrysophyta?. Alga Chrysophyta disebut juga ganggang keemasan (golden algae) atau ganggang pirang. ... Chrysophyta kebanyakan hidup di air tawar, meskipun beberapa jenis ada yang hidup di air laut. Alga kelompok ini mempunyai ... Chrysophyta atau alga keemasan adalah salah satu kelas dari kelompok alga heterokontophyta yang berwarna kuning keemasan. ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Chrysophyta. Algae, Green. Chlorophyta. Algae, Red. Rhodophyta. Fleas. Siphonaptera. Lice. Phthiraptera. Plant Families and ...
Division: Chrysophyta. Class: Bacillariophyceae. Order: Centrales. Family: Thalassiosiraceae. Genus: Stephanocostis. Species: ...
Chrysophyta III : Xantophyceae, różnowiciowe / by: Starmach, Karol, 1900-1988 Published: (1968) * Chrysophyta. by: Siemińska, ... Chrysophyta. by: Starmach, Karol, 1900-1988 Published: (1968) * Cryptophyceae - Kryptofity, Dinophyceae - Dinofity, ...
chrysophyta 2) chlorophyta 3) pyrrophyta 4) phaeophyta 5) NULL (Complaint Here As Incorrect) ...
Division: Chrysophyta. Class: Bacillariophyceae. Order: Pennales. Family: Naviculaceae. Genus: Navicula. Second_taxon_name: sp. ...
The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation. ...
  • Chrysophyta or golden algae is a term used to refer to certain heterokonts. (wikipedia.org)
  • Single-celled algae belonging to the golden algae (Chrysophyta). (exampleslab.com)
  • Pigmen dominan yang terdapat dalam chrysophyta adalah? (theboegis.com)
  • Navicula adalah salah satu anggota daru Chrysophyta berfungsi sebagai membentuk tanah diatom. (jawabanapapun.com)
  • Chrysophyta atau alga keemasan adalah salah satu kelas dari kelompok alga heterokontophyta yang berwarna kuning keemasan. (jawabanapapun.com)
  • The golden alga is in a different family called the Chrysophyta. (texas.gov)
  • It is also present in the large family of heterokonta protists, for example in the cell wall of oomycota, the spines of diatomae and the stalk of chrysophyta [ 7 ]. (biomedcentral.com)
  • Taxonomically, diatoms are generally placed in either the algal phylum Bacillariophyta or in the class Bacillariophyceae of the protist phylum Chrysophyta . (fsu.edu)
  • Chrysophyta (Diatoms), Euglenophyta (Euglena) and Protozoa. (entranceindia.com)
  • Phylum Chrysophyta - Diatoms and. (enfants-terribles.tk)
  • red list: The organisms are included in the latest version of the red list, Rødlista 2015, provided by the Norwegian Biodiversity Information Centre (Artsdatabanken) (encompassing the categories CR, EN, VU, NT, and DD, but not RE). (gbif.no)
  • 1990). Chrysophyta has some characteristics which includes their possession of the photosynthetic pigments which are chlorophylls a and c, they also possess a yellow carotenoid called fucoxanthin, this is responsible for their unique and characteristic color. (wikipedia.org)

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