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Diatoms (0):
Recent article
Diatoms
Abstract
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Abstract
I use a model system of stream biofilms to show that niche partitioning among species of algae can increase the uptake and storage of nitrate, a nutrient pollutant of global concern. I manipulated the number of species of algae growing in the biofilms of 150 stream mesocosms that had been set up to...
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PMID: 21475199
PDF is available here.
PDF is available here.
Abstract
We studied the effects of top-down control by herbivores on a self-organized landscape of regularly spaced, diatom-covered hummocks alternating with water-filled hollows on an intertidal mudflat in The Netherlands. Spatial patterns developed during spring but were followed by a rapid collapse in sum...
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PMID: 21618927
PDF is available here.
PDF is available here.
Abstract
Abstract
Pigment absorption property of two arctic microalgae species (Skeletonema marinoi and Chlorella sp.) cultured at three temperatures (0, 4 and 8°C) was analyzed. Carotenoids and chlorophyll (Chl) c were positive factors to the high cell activities and primary productivities of S. marinoi at 4°C and...
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PMID: 20816707
PDF is available here.
PDF is available here.
Abstract
We reveal the key function of a member of the light-harvesting complex stress-related (LHCSR) protein family, denoted LHCX1, in modulation of excess light energy dissipation. In contrast to green algae, this gene is already maximally expressed in nonstressful light conditions and encodes a protein r...
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PMID: 20921421
PDF is available here.
PDF is available here.
Trends in Microbiology (18)10 2010
Abstract
We review the current state of knowledge of these symbioses and highlight important avenues for future studies.
Copyright © 2010 Elsevier Ltd. All rights reserved....
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PMID: 20674366
PDF is available here.
PDF is available here.
Abstract
We experimentally show that the interaction between dispersal rate and the presence of an environmental gradient with on-average lower resource availability than the homogeneous control treatment affects diversity. In metacommunities of nine co-occurring species of marine benthic microalgae we facto...
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PMID: 20715625
PDF is available here.
PDF is available here.
Biofouling (26)5 2010
Abstract
Diatoms are abundant in biofilms developed on surfaces immersed in sunlit waters. In both the planktonic and the biofilm mode of growth, diatoms produce carbohydrate polymers which perform several functions including motility, protection, production of macro-aggregates and detoxification. However, l...
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PMID: 20512708
PDF is available here.
PDF is available here.
Abstract
Despite the significance of diatoms in biomonitoring, many aspects of their biodiversity and geographical distribution are poorly understood. Recent evidence from molecular data has shown that traditional cosmopolitan and euryvalent morphospecies are often heterogeneous, containing cryptic or pseudo...
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PMID: 20097131
PDF is available here.
PDF is available here.
Optics Express (18)12 2010
Abstract
We have studied the transmission of light coming from a monochromator through single valves of Coscinodiscus wailesii diatoms. Incoming light is confined by the regular pore pattern of the diatom surface into a spot of few microns, its dimensions depending on wavelength. The effect is ascribed to th...
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PMID: 20588345
PDF is available here.
PDF is available here.
Abstract
We demonstrate that not every damaged diatom valve needs to be identified.
(c) 2010 Elsevier Ltd. All rights reserved....
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PMID: 20226586
PDF is available here.
PDF is available here.
Abstract
We show a pronounced latitudinal increase in phytoplanktonic and zooplanktonic biodiversity in the extratropical North Atlantic Ocean in recent decades. We also show that this rise in biodiversity paralleled a decrease in the mean size of zooplanktonic copepods and that the reorganization of the pla...
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PMID: 20479247
PDF is available here.
PDF is available here.
Biotechnology Letters (32)4 2010
Abstract
Poly(N-isopropylacrylamide)-co-N-(1-phenylethyl) acrylamide [P(NIPAAm-co-PEAAm)] thermo-responsive thin films with a lower critical solution temperature (LCST) adjusted to fit marine applications were used to investigate the effect of changes in the wetting properties of a surface on the adhesion of...
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PMID: 20035372
PDF is available here.
PDF is available here.
Abstract
We conducted a controlled mesocosm experiment with inorganically acidified wetland water and wetland sediment replicates to pH 3 from a naturally acidic (pH 3.9, conductivity=74microScm(-1)) wetland in south-western Australia. Following acidification, dissolved organic carbon and nitrogen declined,...
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PMID: 20163829
PDF is available here.
PDF is available here.
Chemosphere (79)1 2010
Abstract
Biotic indices based on macro-invertebrates and diatoms are frequently used to diagnose ecological quality in watercourses, but few published works have assessed their effectiveness as biomonitors of the concentration of micropollutants. A biological survey performed at 188 sites in the basin of the...
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PMID: 20163819
PDF is available here.
PDF is available here.
Abstract
We present results related to the genera Encyonema, Encyonopsis and Gomphonema. Plankton and periphyton samples were collected in lotic and lentic waterbodies from the Amazonian-Andean region, the Amazon River, Japurá River and Porvenir River basins during 1993, 1994, 2001 and 2003. At each samplin...
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PMID: 20411706
PDF is available here.
PDF is available here.
Abstract
Periphytic diatoms were studied to evaluate the water quality of a newly created lake, formed by the enclosure of the formerly tidal Cardiff Bay (Wales, UK), and the effects of two inflowing rivers which drain densely populated and industrialised catchments. Seven sites in Cardiff Bay and two locati...
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PMID: 19247794
PDF is available here.
PDF is available here.
Abstract
We show that much of observed cetacean paleodiversity can indeed be explained by diatom diversity in conjunction with variations in climate as indicated by oxygen stable isotope records (delta18O)....
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PMID: 20167785
PDF is available here.
PDF is available here.
Abstract
Abstract
We show that the bioavailability of dissolved Fe may decline because of ocean acidification. Acidification of media containing various Fe compounds decreases the Fe uptake rate of diatoms and coccolithophores to an extent predicted by the changes in Fe chemistry. A slower Fe uptake by a model diatom...
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PMID: 20075213
PDF is available here.
PDF is available here.
Abstract
Sediment profiles of two alpine lakes located in the Tatra Mountains, the Toporowy Staw Nizni (TSN) and the Zielony Staw Gasienicowy (ZSG), were studied for their chronology, lithology, diatom and cladoceran remains. The sediment sequences, 50cm long from TSN and 30cm long from ZSG, were deposited d...
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PMID: 19896170
PDF is available here.
PDF is available here.
Abstract
Tega-numa (Lake Tega) is one of the eutrophic lakes in Japan. For the improvement of water quality in Lake Tega, the North-chiba Water Conveyance Channel was constructed in 2000, which transfer water from Tone River into the lake. After 2000, the dominant species of diatoms, mainly Cyclotella sp., h...
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PMID: 21235152
PDF is available here.
PDF is available here.
Abstract
The effects of allochthonous dissolved organic matter (DOM) on the growth and photosynthesis of Phaeodactylum tricornutum were investigated. P. tricornutum incubated in f/2 medium was exposed to DOM additives, which were extracted from the plant and sediment samples of a salt marsh in North Branch o...
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PMID: 21179964
PDF is available here.
PDF is available here.
Biofouling (26)4 2010
Abstract
The physical roughness of a surface changes when freshwater biofilms colonize and grow on it and this has significant implications for surfaces enclosing water conveying systems such as pipelines and canals. Plates with surfaces initially artificially roughened with varying grit size were deployed i...
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PMID: 20234953
PDF is available here.
PDF is available here.
Abstract
We present a meticulous search for LHC-like sequences in public genome and expressed sequence tag databases covering twelve representative photosynthetic eukaryotes from the three primary lineages of plants (Plantae): glaucophytes, red algae and green plants (Viridiplantae). By introducing a coheren...
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PMID: 20673336
PDF is available here.
PDF is available here.
Abstract
This is the first study that presents concentrations of domoic acid detected in the whole shellfish tissue from breeding and harvesting areas along the Croatian coast of the Adriatic Sea during the period 2006 to 2008. Shellfish sample analyses after SAX cleaning procedures, using a UV-DAD-HPLC syst...
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PMID: 20938398
PDF is available here.
PDF is available here.
Abstract
The study of pesticide effects on algae, and diatoms in particular, was focused on photosynthesis and biomass growth disturbances. Few studies have been performed to investigate the effects of these toxic agents on intracellular structures of diatom cells. Nuclear alterations and cell wall abnormali...
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PMID: 19957117
PDF is available here.
PDF is available here.
Photosynthesis Research (102)1 2009
Abstract
Photosynthetic parameters of phytoplankton and sea ice algae from landfast sea ice of the Chukchi Sea off Point Barrow, Alaska, were assessed in spring 2005 and winter through spring 2006 using Pulse Amplitude Modulated (PAM) fluorometry including estimates of maximum quantum efficiency (F(v)/F(m)),...
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PMID: 19728139
PDF is available here.
PDF is available here.
Abstract
We analysed photosynthesis, responses to variable light and macromolecular allocations across a size panel of marine centric diatoms. The diatoms have strong capacities to withstand and exploit fluctuating light, when compared with picophytoplankton. Within marine diatoms, small species show larger...
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PMID: 19735282
PDF is available here.
PDF is available here.
Abstract
Diatoms have continued to attract research interest over a long time. One important reason for this research interest is the amazingly beautiful microstructured and nanostructured patterning of the silica-based diatom cell walls. These materials become increasingly important from the materials scien...
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PMID: 19629468
PDF is available here.
PDF is available here.
Hereditas (Beijing) (31)8 2009
Abstract
Sixteen cDNA fragments of Phaeodactylum tricornutum were isolated and identified to be up-regulated under nitrogen starvation by suppression subtractive hybridization (SSH) technology in order to elucidate the molecular mechanism of the diatom nitrogen utilization. Seven of them have high similarity...
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PMID: 19689950
PDF is available here.
PDF is available here.
Abstract
Genes encoding Delta6 desaturase, Delta6 fatty acid elongase, and Delta5 desaturase from the alga, Phaeodactylum tricornutum, were co-expressed in Pichia pastoris to produce arachidonic acid (ARA; 20:4 Delta(5, 8, 11, 14)) and eicosapentaenoic acid (EPA; 20:5 Delta(5, 8, 11, 14, 17)). A panel of Pic...
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PMID: 19306085
PDF is available here.
PDF is available here.
Biofouling (25)6 2009
Abstract
The proteinaceous nature of the adhesives used by most fouling organisms to attach to surfaces suggests that coatings incorporating proteolytic enzymes may provide a technology for the control of biofouling. In the present article, the antifouling (AF) and fouling release potential of model coatings...
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PMID: 19387876
PDF is available here.
PDF is available here.
Abstract
EMBO Reports (10)6 2009
Abstract
We show that the PtCPF1 protein from the marine diatom Phaeodactylum tricornutum shows 6-4 photoproduct repair activity and can act as a transcriptional repressor of the circadian clock in a heterologous mammalian cell system. Conversely, it seems to have a wide role in blue-light-regulated gene exp...
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PMID: 19424294
PDF is available here.
PDF is available here.
Abstract
We examined their electronic absorption properties using two synthetic types of esters possessing a porphyrin pi-system: acrylate-type (17-CH=CH-COOR) prepared by esterification of natural Chl-c1 and Chl-c2, and propionate-type (17-CH2-CH2-COOR) by 17,18-oxidation of natural Chl-a and its 8-vinyl an...
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PMID: 19421450
PDF is available here.
PDF is available here.
Abstract
We show a decrease in the median size of planktonic diatoms in response to higher nutrient concentrations in a set of intermediate-sized alkaline lakes. Climate-induced increases in the frequency, duration and strength of water column stratification may select smaller planktonic species in the ocean...
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PMID: 19203916
PDF is available here.
PDF is available here.
Abstract
We present empirical evidence for the multivariate productivity-diversity (MPD) hypothesis, which argues that differing perspectives on productivity-diversity relationships can be resolved by recognizing that historical research has focused on how resource supply regulates both the productivity and...
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PMID: 19537544
PDF is available here.
PDF is available here.
Biochemical Journal (419)3 2009
Abstract
These results strongly suggest that the amphipathic C-terminal helix of PtCA1 plays an essential role in the formation of the macromolecular protein complex....
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PMID: 19200059
PDF is available here.
PDF is available here.
Abstract
We explore the bioenergetic, membrane recycling, and vacuolar volume requirements that must be satisfied for pinocytosis-mediated silicon uptake. These calculated requirements contrast starkly with existing data on diatom physiology, uptake kinetics, growth, and ultrastructure, leading us to conclud...
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PMID: 19260019
PDF is available here.
PDF is available here.
Abstract
Three antifouling (AF) sesterterpenes have been isolated from the New Zealand marine sponge Semitaspongia bactriana with toxicity against the diatom Nitzschia closterium and bryozoan Bugula neritina. The three metabolites have been characterised by spectroscopic techniques as 7E,12E,20Z-variabilin (...
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PMID: 19413109
PDF is available here.
PDF is available here.
Abstract
We present Monte Carlo simulation results demonstrating the feasibility of using the focused ion beam based X-ray microanalysis technique (FIB-EDS) for the 3D elemental analysis of biological samples. In this study, we used a marine diatom Thalassiosira pseudonana as our model organism and NISTMonte...
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PMID: 19220700
PDF is available here.
PDF is available here.
Abstract
Delta5-fatty acid desaturase is the key enzyme in synthesis of arachidonic acid. Two specific fragment was cloned from genomic DNA and total cDNA of Phaeodactylum tricornutum through PCR with primer designed according to the reported sequences, respectively 1520 bp and 1410 bp. Comparison of the gen...
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PMID: 19459323
PDF is available here.
PDF is available here.
Fa yi xue za zhi (25)1 2009
Abstract
The diatom had been identified with clear striations, counted conveniently and classified easily. CONCLUSION: The improved nitric acid digestion method is not only simple with a higher successful rate of detection, but also can prevent interference from contamination. It can improve the stability of...
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PMID: 19397213
PDF is available here.
PDF is available here.
Abstract
The herbicide bentazon (CASRN 25057-89-0) is extensively used in agriculture in Brittany (France) to replace atrazine. Bentazon is not readily adsorbed by soil and therefore it enters adjacent freshwater ecosystems, making its way to estuarine and marine waters areas. Information reg...
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PMID: 19778254
PDF is available here.
PDF is available here.
Abstract
The toxicity of bisphenol A (BPA) to Stephanodiscus hantzschii, a diatom isolated from tidal water of Futian Mangrove Nature Reserve, China, and the bioaccumulation and removal capability of the marine microalga to BPA were investigated in the present study. Toxicity experiments showed that the 96-h...
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PMID: 18639342
PDF is available here.
PDF is available here.
Abstract
We annotated genes encoding isozymes of the reductive and oxidative pentose phosphate pathways in the genomes of the centric diatom Thalassiosira pseudonana and the pennate diatom Phaeodactylum tricornutum and bioinformatically inferred their intracellular distribution. Prediction results were confi...
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PMID: 19206144
PDF is available here.
PDF is available here.
Abstract
Results of the analysis of biological materials originating from the body of general Sikorski are presented in the paper. Samples of the liver, kidney, intestine and lung were analysed for metals and As content, and samples of the lung, liver, kidney, stomach, intestine and bone marrow--for diatoms...
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PMID: 19711817
PDF is available here.
PDF is available here.
Nucleic Acids Research (37)Database issue 2009
Abstract
The Diatom Expressed Sequence Tag (EST) Database was constructed to provide integral access to ESTs from these ecologically and evolutionarily interesting microalgae. It has now been updated with 130,000 Phaeodactylum tricornutum ESTs from 16 cDNA libraries and 77,000 Thalassiosira pseudonana ESTs f...
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PMID: 19029140
PDF is available here.
PDF is available here.
Abstract
Abstract
We determined for the first time the crystal structure of diatom cytochrome c(6) from Phaeodactylum tricornutum at 1.5 A resolution. The overall structure of the protein was classified as a class I c-type cytochrome. The physicochemical properties of the protein were examined by denaturation with gu...
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PMID: 19129656
PDF is available here.
PDF is available here.
Marine Drugs (7)4 2009
Abstract
In spite of the high abundance and species diversity of diatoms, only a few bioactive compounds from them have been described. The present study reveals a high number of mammalian cell death inducing substances in biofilm-associated diatoms sampled from the intertidal zone. Extracts from the genera...
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PMID: 20098602
PDF is available here.
PDF is available here.
Cryo letters (30)3 2009
Abstract
In this paper, the cryopreservation of marine diatom algae (Nitzschia closterium f. minutissima Allen and Nelson and Chaetoceros muelleri Lemmermann) using the encapsulation-vitrification technique was studied. The effect of the composition the vitrification solution, of the concentration of the loa...
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PMID: 19750246
PDF is available here.
PDF is available here.
Abstract
Comparative analysis of species composition of ice diatom algae (IDA) of the White, Barents, Kara, Laptev, East Siberian, Chukchi Seas and the Basin of the Arctic Ocean was conducted on the basis of both original and published data. Species composition of IDA counts 567 taxa including 122 centric an...
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PMID: 19425351
PDF is available here.
PDF is available here.
Tsitologiia (51)4 2009
Abstract
Diatoms significantly differ from other groups of heterokont algae in the diversity of chloroplast forms, their number, and location in a cell and in the structure of pyrenoids. The information on the fine structure of chloroplast is recognized to be important for taxonomic and phylogenetic studies...
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PMID: 19505053
PDF is available here.
PDF is available here.
Marine Biotechnology (11)1 2009
Abstract
We report the isolation of an antibacterial fatty acid. Mass spectrometry and (1)H-nuclear magnetic resonance spectroscopy revealed it to be the polyunsaturated fatty acid, eicosapentaenoic acid (EPA). We show that EPA is active against a range of both Gram-positive and Gram-negative bacteria, inclu...
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PMID: 18575935
PDF is available here.
PDF is available here.
BMC Genomics (10)1 2009
Abstract
Contingency tests of specific predictions of the chromalveolate model find no evidence for an unusual red algal contribution to Phytophthora genomes, nor that putative cyanobacterial sequences that are present entered these genomes through a red algal endosymbiosis. Examination of genes unrelated to...
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PMID: 19843329
PDF is available here.
PDF is available here.
Aquatic Toxicology (90)4 2008
Abstract
Our results showed that, in general, both Cd and Zn were sequestered in insoluble forms (organelles, metal-rich granules, and cellular debris). The main binding pool for the newly acquired metals was organelles for Cd and cellular debris for Zn. Metallothionein-like protein (MTLP) was the most impor...
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PMID: 18992948
PDF is available here.
PDF is available here.
Abstract
We describe an unusual fossil assemblage from Devon Island, Arctic Canada, that offers a snapshot of a ca 75 Myr ago marine palaeoecosystem adapted to such conditions. Thick siliceous biogenic sediments and glaucony sands reveal remarkably persistent high primary productivity along a high-latitude L...
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PMID: 18713718
PDF is available here.
PDF is available here.