• Taking inspiration from the structure of diatom algae frustules and motivated by the need for new detecting strategies for emerging nanopollutants in water, we analyze the potential of nanoporous silica tablets as metering devices for the concentration of biomolecules or nanoparticles in water. (springer.com)
  • Taking inspiration from the exoskeleton (frustule) of diatom algae [ 23 ], in this work, we conceptualize nanoporous metering tablets for the concentration of some classes of biomolecules and nanoparticles in water. (springer.com)
  • Diatoms are photosynthesising algae that live in most aquatic environments, both fresh and salt water. (cellimagelibrary.org)
  • 18 species of diatoms, nine species of cyanobacteria, four species of euglenoids and green algae each, one species of dinoflagellates, red algae and chrysophytes each, are first reports for south-western Nigeria with regard to existing checklists in the region. (scialert.net)
  • Evolving imaging techniques heighten magnification and concentrate the view in plant studies such as the centric diatom (algae) rendered by electron microscopy and the cyanotype of a Turkey Oak by contemporary artist Ansel Oommen. (jstor.org)
  • Diatoms are unicellular algae characterized by ornamented silica shells. (cuni.cz)
  • Diatoms , a big group of microalgae, are free-floating unicellular algae found in both the oceans and freshwater. (rsscience.com)
  • Like plants and algae, diatoms contain chlorophyll A in the chloroplast for photosynthesis. (rsscience.com)
  • fauna and flora, including on groups of interest to the microscopist, such as diatoms and other algae. (diatomsireland.com)
  • Diatoms are algae that have a glass-like skeleton made of silica. (diatomsireland.com)
  • Diatoms are microscopic, photosynthetic algae (which due to the yellow-brown chloroplasts they contain are sometimes referred to as golden algae). (onestopias.com)
  • Diatoms are unicellular algae responsible for approximately 20% of global carbon fixation. (uni-konstanz.de)
  • The CNN was generally able to capture important seasonal dynamics such as the shift from large centric diatoms to small pennate diatoms in both seasons, which is thought to be driven by increases in glacial meltwater from January to March. (rutgers.edu)
  • Diatoms was characterised by the proliferation of pennate diatoms species (Amphiprora sp. (siftdesk.org)
  • Pennate diatoms dominated the biofilms whilst centric diatoms were dominant in the water column. (nio.res.in)
  • Cell counts revealed that centric and pennate diatoms (largely Pseudo-nitzschia and Chaetoceros spp. (sjsu.edu)
  • Diatoms can be divided into two groups by their shapes, the pennate diatoms and the centric diatoms. (rsscience.com)
  • Most diatoms are pennate diatoms (bilaterally symmetric), while a few diatoms are centric diatoms (radical symmetric). (rsscience.com)
  • Since some of the aggregate-forming diatom species store nitrate intracellularly, we explored the fate of intracellular nitrate and its availability for microbial metabolism within anoxic diatom-bacteria aggregates. (frontiersin.org)
  • We conclude that the Lower Jurassic Pyxidicula fossils were most likely calcareous nannofossils, whereas the Middle Jurassic Pyxidicula species has been reassigned to the Lower Cretaceous and is likely a testate amoeba, not a diatom. (lu.se)
  • Diatoms formed the most abundant group making up 90 species from 39 genera. (scialert.net)
  • Despite centric diatoms are bloom forming in this area, there is a lack of information about the species that form the community. (merconsortium.eu)
  • We guided participants in learning how to better use the Diatoms of North America website (diatoms.org) and gather the information needed to produce a "species" page. (diatoms.org)
  • in northern part contrasting a progressive augment of centric diatoms species (Biddulphia sp. (siftdesk.org)
  • Most diatoms are nonmotile, but some species are capable of gliding over the surface due to their ability to secrete mucus. (rsscience.com)
  • In addition, sperms in some species (centric diatoms) have flagella and can swim to meet female gametes (mature female germ cells such as an egg). (rsscience.com)
  • Some species are less fussy and will incorporate sand grains, diatoms , desmids, and bits of debris into the shell construction. (diatomsireland.com)
  • Both periods also show increasing algal growth and changes in diatom species composition (i.e. increase in centric diatoms and recent blooms in Asterionella formosa). (fmach.it)
  • Five potential toxin producing species were observed at bloom levels during the study period, including the diatom Pseudo-nitzschia calliantha and the dinoflagellates Pyrodinium bahamense var. (pdffox.com)
  • Gyrosigma is a genus of diatoms belonging to the family Pleurosigmataceae. (wikipedia.org)
  • Armbrust EV, Galindo HM (2001) Rapid evolution of a sexual reproduction gene in centric diatoms of the genus Thalassiosira . (springer.com)
  • Validation of the centric diatom genus name Cyclostephanos. (calacademy.org)
  • Molecular clocks estimate that diatom microalgae, one of Earth's foremost primary producers, originated near the Triassic-Jurassic boundary (200 Ma), which is close in age to the earliest, generally accepted diatom fossils of the genus Pyxidicula. (lu.se)
  • Fe addition elicited varying responses by different diatom genera, with more prevalent diatoms experiencing more differential regulation of Fe-responsive pathways and proteins. (uri.edu)
  • In addition, some diatom genera expressed components of a putative Fe-siderophore uptake system, including an Fe-siderophore outer membrane receptor protein and corresponding ABC transporter components. (uri.edu)
  • Armbrust EV (1999) Identification of a new gene family expressed during the onset of sexual reproduction in the centric diatom Thalassiosira weissflogii . (springer.com)
  • Chapter 4 investigated how three SO diatoms ( Fragilariopsis cylindrus , Pseudo-nitzschia arenysensis , and Thalassiosira tumida ) interact with associated bacterial communities under Fe stress. (uri.edu)
  • Isolation of fucoxanthin chlorophyll protein complexes of the centric diatom Thalassiosira pseudonana associated with the xanthophyll cycle enzyme diadinoxanthin de-epoxidase. (uni-leipzig.de)
  • The genome sequence of the marine centric diatom Thalassiosira pseudonana was recently reported, revealing a wealth of information about diatom biology. (uni-konstanz.de)
  • We identified and annotated genes for enzymes involved in carbohydrate pathways based on extensive EST support and comparison to the whole genome sequence of a second diatom, Thalassiosira pseudonana. (uni-konstanz.de)
  • Diatoms are a group of highly diverse photosynthetic eukaryotes that account for about 40% of oceanic primary production. (uri.edu)
  • View more of these photosynthetic protists in the Diatom Depot. (diatomsireland.com)
  • Photosynthetic light reactions in diatoms. (uni-leipzig.de)
  • Diatoms are photosynthetic secondary endosymbionts found throughout marine and freshwater environments, and are believed to be responsible for around one-fifth of the primary productivity on Earth. (uni-konstanz.de)
  • The planktonic diatom community structure differed from the biofilm community. (nio.res.in)
  • Like other diatoms, Gyrosigma has a siliceous cell wall called a frustule. (wikipedia.org)
  • A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide, like glass) called a frustule . (rsscience.com)
  • Unlike the plants' cell walls that are made of cellulose, the diatom cell walls are made of silica (i.e. glass), called frustule. (rsscience.com)
  • In this figure] Illustration of the structure of a diatom frustule. (rsscience.com)
  • When diatoms divide, each daughter cell receives one of the frustules from parents, acting as an epitheca, the bigger frustule. (rsscience.com)
  • In this "Photo Guide for Northern European Seas" we describe the major phytoplankton groups, diatoms and dinoflagellates with additional information on ciliates and smaller flagellates. (pfeil-verlag.de)
  • Dinoflagellates, diatoms or cyanobacteria dominated the phytoplankton communities in terms of biovolume at all six sampling sites. (pdffox.com)
  • Effects of iron limitation on carbon balance and photophysiology of the Antarctic diatom Chaetoceros cf. simplex . (uni-leipzig.de)
  • Diatoms store energy either as lipids or as chrysolaminaran (a β-1,3-glucan) outside of the plastids. (uni-konstanz.de)
  • Inverted microscopy analysis of diatoms resolved 31 and 29 taxa in the north and south Sfax coasts respectively. (siftdesk.org)
  • Census of Australian Marine Diatoms (web page), web resource: http: www.anbg.gov.au/abrs/Marine_Diatoms/index.html . (cmar.csiro.au)
  • This Nomarski interference microscopy shows a marine centric diatom (unicellular alga). (cellimagelibrary.org)
  • The spatial and seasonal variations of the diatoms communities were examined during four marine cruises conducted between years 2011 and 2012 on 12 stations at the north (restored) and south (not yet restored) coasts. (siftdesk.org)
  • Diatoms represent a major part of the eukaryotic primary production in marine ecosystems (Drira et al. (siftdesk.org)
  • 2009). The seasonal succession of diatoms communities were governed by a combination of physical, chemical and biological variables in marine ecosystems (Meiners et al. (siftdesk.org)
  • Diatoms, which are early autotrophic colonisers, are an important constituent of the biofouling community in the marine environment. (nio.res.in)
  • In marine water diatoms can be found in an enormous variety of shapes. (diatomsireland.com)
  • Thirty-one percent of the diatom-derived nitrate was converted to nitrogen gas, indicating that a substantial fraction of the intracellular nitrate pool of S. marinoi becomes available to the aggregate-associated bacterial community. (frontiersin.org)
  • Hence, aggregate-associated diatoms accumulate nitrate from the surrounding water and sustain complex nitrogen transformations, including loss of fixed nitrogen, in anoxic, pelagic microniches. (frontiersin.org)
  • In large areas of the ocean deemed high nitrate, low chlorophyll (HNLC) regions, dissolved macronutrient (nitrogen, phosphorus, silica) concentrations are high in the surface but diatom biomass is consistently low. (uri.edu)
  • We also suggest the relative expression of NRT2 compared to the expression of GSII as a marker of cellular nitrogen status and the relative expression of iron starvationinduced protein genes (ISIP1, ISIP2, and ISIP3) compared to the expression of the thiamine biosynthesis gene (thiC) as a marker of iron status in natural diatom communities. (sjsu.edu)
  • Variations in diatom communities may determine the functional ecosystem of the benthic environment. (nio.res.in)
  • The occurrence in year 2005 of the centric diatom Cyclotella meduanae Germain in Alalay Pond, a saline, highly eutrophic ecosystem in the city of Cochabamba, Bolivia is reported. (org.bo)
  • This work sought to determine SO diatom biogeography and investigate their potential Fe-limitation coping strategies. (uri.edu)
  • Chapters 1 and 2 focused on determining diatom biogeography and community structure in the western Antarctic Peninsula (WAP), the Ross Sea Polynya (RSP), and surrounding HNLC Antarctic Circumpolar Current (ACC) waters. (uri.edu)
  • Ultimately, this dissertation work adds to our understanding of diatoms as important players in the SO ecosystem by assessing their biogeography and responses to varying Fe concentrations using molecular techniques that capture their highly diverse nature. (uri.edu)
  • 15 N photo-CIDNP MAS NMR on both photosystems and magnetic field-dependent 13 C photo-CIDNP MAS NMR in photosystem II of the diatom Phaeodactylum tricornutum . (uni-leipzig.de)
  • Here we report the complete genome sequence of the pennate diatom Phaeodactylum tricornutum and compare it with that of T. pseudonana to clarify evolutionary origins, functional significance and ubiquity of these features throughout diatoms. (uni-konstanz.de)
  • The whole genome sequence of the diatom Phaeodactylum tricornutum has recently been completed. (uni-konstanz.de)
  • The Southern Ocean (SO) is the largest of these environments, and when exogenous Fe is supplied to this region, large diatoms blooms and subsequent carbon export are promoted. (uri.edu)
  • In this figure] Illustration of diatoms asexual reproduction and size reduction in daughter cells. (rsscience.com)
  • The results confirm that restoration had positive effects on the abiotic variables and diatoms assemblage of the north coast. (siftdesk.org)
  • In addition to chlorophyll A, diatoms also have chlorophyll C, fucoxanthin, and carotene, giving them golden-brown color. (rsscience.com)
  • Results from the ultrastructural plus the molecular analyses were compared with the counting size method with the aim to demonstrate that the deep taxonomical study uncover a high diversity in this group of centric diatoms. (merconsortium.eu)
  • Diatom-targeted high-throughput molecular barcoding data and corresponding environmental metadata were analyzed to determine diatom community composition and the factors driving their structure. (uri.edu)
  • Analysis of molecular divergence compared with yeasts and metazoans reveals rapid rates of gene diversification in diatoms. (uni-konstanz.de)
  • Excluding the Pyxidicula fossils widens the gap between the estimated time of origin and the oldest abundant fossil diatom record to 75 million years. (lu.se)
  • Preliminary results indicate that in MC, where 57% of the protistan biomass was represented by centric diatoms and 40% by pennates, clearance rates were higher for the later. (conicet.gov.ar)
  • The same is true for LT, where the protistan biomass was 70 % pennate and 30 % centric diatoms. (conicet.gov.ar)
  • The ubiquitous nitrate-storing diatom Skeletonema marinoi was studied as both axenic cultures and laboratory-produced diatom-bacteria aggregates. (frontiersin.org)
  • The daughter diatom that receives the bigger frustules becomes the same size as its parents. (rsscience.com)
  • The effects of substratum and temporal variations on the fouling diatom community structure in a monsooninfluenced tropical estuary were studied. (nio.res.in)
  • Gyrosigma has valves with a central slit called a raphe, which allows the diatom to move. (wikipedia.org)
  • Diatoms can be further sub-divided according to whether they possess a raphe (a median line or slot in the cell wall), a pseudoraphe, or completely lack a raphe. (onestopias.com)
  • These findings go a long way towards explaining the incredible diversity and success of the diatoms in contemporary oceans. (uni-konstanz.de)
  • Diatom analyses are applied not only in science, for example, in climate change investigation, but in practice as well: in biomonitoring or in forensic investigations in drowning cases. (cuni.cz)
  • I found this diatom (Tabellaria) in the pond water in the spring near my home. (rsscience.com)
  • In Chapter 3, metatranscriptomic sequencing was used to examine the gene expression response of a SO diatom community and their associated bacteria to Fe-amendment incubations during the 2016 WAP cruise. (uri.edu)
  • More than 300 of these gene transfers are found in both diatoms, attesting to their ancient origins, and many are likely to provide novel possibilities for metabolite management and for perception of environmental signals. (uni-konstanz.de)
  • Thanks to the high persistence of shells, relatively easy determination and wide spread occurrence are the diatoms used for natural condition assessment. (cuni.cz)
  • The abundance of diatoms has a huge impact on the earth because one-fifth of the photosynthesis on the earth is done by diatoms. (rsscience.com)
  • via photosynthesis, is attributable to diatoms - in large due to their great abundance. (onestopias.com)
  • We identified genes potentially involved in a C4-like photosynthesis in P. tricornutum and, on the basis of sequence-based putative localization of relevant proteins, discuss possible differences in carbon concentrating mechanisms and CO2 fixation between the two diatoms. (uni-konstanz.de)
  • On the 2016 WAP cruise, a bacterial addback experiment was completed with these previously antibiotic-treated diatoms under Fe-rich (+Fe) and Fe-limited (-Fe) conditions. (uri.edu)
  • In the bacterial metatranscriptome, upregulation of Fe-siderophore uptake genes was observed, possibly indicating increased competition for Fe among the stimulated diatom-associated bacterial community. (uri.edu)
  • The two pennates F. cylindrus and P. arenysensis recruited distinct bacterial communities from the centric T. tumida , but the +Fe and -Fe bacterial communities were not significantly different for all three diatoms. (uri.edu)
  • In addition to substratum variations, the biofilm diatom community structure also showed significant seasonal variations, which were attributed to physico-chemical and biological changes in both the water and substratum. (nio.res.in)
  • Temporal variations in the tychopelagic diatoms of the water were also observed to exert an influence on the biofilm diatom community. (nio.res.in)
  • Diatoms: powerful indicators of environmental change. (cuni.cz)
  • Diatom-bacteria aggregates are key for the vertical transport of organic carbon in the ocean. (frontiersin.org)
  • As such, SO diatoms are major players in the global carbon cycle and were the focus of this dissertation. (uri.edu)
  • These tiny beautiful shapes, seem kind of plant-like, are what we know today as diatoms. (rsscience.com)
  • Pre-purification of diatom pigment protein complexes provides insight into the heterogeneity of FCP complexes. (uni-leipzig.de)
  • Protein localization to mitochondria was predicted based on identified similarities to mitochondrial localization motifs in other eukaryotes, whereas protein localization to plastids was based on the presence of signal peptide motifs in combination with plastid localization motifs previously shown to be required in diatoms. (uni-konstanz.de)
  • Comparison of diatoms recorded in samples of body tissues (lungs, bone marrow) with communities from the locality where the drowned was found, has helped to clarify many cases. (cuni.cz)
  • Diatoms mostly reproduce asexually by binary fission (vegetative reproduction), producing two daughter cells with identical genes. (rsscience.com)
  • Although Pyxidicula resembles some extant radial centric diatoms and has character states that may have been similar to those of ancestral diatoms, we describe numerous sources of uncertainty regarding the reliability of these records. (lu.se)
  • 2003). Diatoms tend to have considerably higher maximum uptake rates of nutrients than any other group (Litchman et al. (siftdesk.org)