keyword
MENU ▼
Read by QxMD icon Read
search

Diatom

keyword
https://www.readbyqxmd.com/read/28231315/functional-xanthophyll-cycle-and-pigment-content-of-a-kleptoplastic-benthic-foraminifer-haynesina-germanica
#1
Thierry Jauffrais, Bruno Jesus, Vona Méléder, Emmanuelle Geslin
Some shallow water benthic foraminifera are able to retain functional chloroplasts (kleptoplasts) from their food source, i.e. diatoms. Here we assessed the functionality of the kleptoplast xanthophyll cycle (XC, i.e. the main diatom short-term photo-regulation mechanism) and we surveyed Haynesina germanica kleptoplast pigment composition over time and at different light regimes. Six common diatom lipophilic pigments were detected, two chlorophylls (Chl a, Chl c) and four carotenoids (fucoxanthin and by-products, diadinoxanthin, diatoxanthin and β-carotene), the same pigment profile as the diatom species frequently isolated at the sampling site...
2017: PloS One
https://www.readbyqxmd.com/read/28226268/recent-progress-in-diatom-genomics-and-epigenomics
#2
REVIEW
Leila Tirichine, Achal Rastogi, Chris Bowler
Diatoms are one of the most diverse and successful groups of phytoplankton at the base of the food chain, sustaining life in the ocean and performing vital biogeochemical functions. The last fifteen years have witnessed the comprehensive analysis of several diatom genomes, revealing that they bear traces of their endosymbiotic origins from algal and heterotrophic ancestors, as well as significant gene transfer from bacteria. Their chimeric genomes are further regulated by a range of chromatin-based processes that are characteristic of both plant and animal genomes...
February 19, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28222924/assessing-anthropogenic-pressures-on-streams-a-random-forest-approach-based-on-benthic-diatom-communities
#3
Floriane Larras, Romain Coulaud, Edwige Gautreau, Elise Billoir, Juliette Rosebery, Philippe Usseglio-Polatera
Benthic diatoms have been widely used to assess the ecological status of freshwater ecosystems, especially in the context of recent international water framework directive policies (e.g. the WFD). Despite diatom-based indices are known to respond fastly to water quality degradation, they are not designed to precisely identify the nature of pressures co-occurring in the environment. Based on large scale monitoring data, we aimed at building models able to estimate the risk of stream impairment by many types of anthropogenic pressures from taxonomy-based and trait-based characteristics of diatom assemblages...
February 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28222374/diuron-causes-sinking-retardation-and-physiochemical-alteration-in-marine-diatoms-thalassiosira-pseudonana-and-skeletonema-marinoi-dohrnii-complex
#4
Mst Ruhina Margia Khanam, Yohei Shimasaki, Md Zahangir Hosain, Koki Mukai, Michito Tsuyama, Xuchun Qiu, Rumana Tasmin, Hiroshi Goto, Yuji Oshima
The present research investigated the effect of diuron on sinking rate and the physiochemical changes in two marine diatoms, Thalassiosira pseudonana (single-celled species) and Skeletonema marinoi-dohrnii complex (chain-forming species). The results revealed that the sinking rate of both diatoms exposed to diuron at a level of 50% effective concentration for growth (EC50) decreased significantly compared with the control. Photosynthetic performance (Fv/Fm and PIABS) of both diatoms also decreased significantly with diuron exposure...
February 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28221791/adiabatic-variational-theory-for-cold-atom-molecule-collisions-application-to-metastable-helium-atom-colliding-with-ortho-and-para-hydrogen-molecule
#5
Mariusz Pawlak, Yuval Shagam, Ayelet Klein, Edvardas Narevicius, Nimrod Moiseyev
We recently developed an adiabatic theory for cold molecular collision experiments. In our previous application of this theory, we assumed that during the experiment the collision of an atom with a diatom takes place when the diatom is in the ground rotational state and is located in a plane. In this paper, we present how the variational approach of the adiabatic theory for low-temperature collision experiments can be used for the study a 5D collision between the atom and the diatomic molecule with no limitations on its rotational quantum states and no plane restrictions...
February 21, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28217746/integrated-regulatory-and-metabolic-networks-of-the-marine-diatom-phaeodactylum-tricornutum-predict-the-response-to-rising-co2-levels
#6
Jennifer Levering, Christopher L Dupont, Andrew E Allen, Bernhard O Palsson, Karsten Zengler
Diatoms are eukaryotic microalgae that are responsible for up to 40% of the ocean's primary productivity. How diatoms respond to environmental perturbations such as elevated carbon concentrations in the atmosphere is currently poorly understood. We developed a transcriptional regulatory network based on various transcriptome sequencing expression libraries for different environmental responses to gain insight into the marine diatom's metabolic and regulatory interactions and provide a comprehensive framework of responses to increasing atmospheric carbon levels...
January 2017: MSystems
https://www.readbyqxmd.com/read/28214648/toxicity-degradation-and-metabolic-fate-of-ibuprofen-on-freshwater-diatom-navicula-sp
#7
Tengda Ding, Mengting Yang, Junmin Zhang, Bo Yang, Kunde Lin, Juying Li, Jay Gan
Ibuprofen (IBU) is one of the most widely used and frequently detected human pharmaceuticals in aquatic environment. However, the toxicity of IBU on diatom and its fate remain still unkown. In the present study, the toxicity of IBU on the diatom was evaluated by the algal growth rate, the chlorophyll-a and carotenoids contents. The degradation of IBU including in particular the potential for the formation of incomplete degradation products was also explored. Biochemical characteristics of Navicula sp. were significantly inhibited at IBU concentrations up to 50mgL(-1) after 10days of exposure...
February 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28213541/accurate-quantification-of-laminarin-in-marine-organic-matter-with-enzymes-from-marine-microbes
#8
Stefan Becker, André Scheffel, Martin F Polz, Jan-Hendrik Hehemann
Marine algae produce varieties of glycans, which fulfill diverse biological functions and fuel the carbon and energy demand of heterotrophic microbes. A common approach to analyze marine organic matter uses acid to hydrolyze its glycans into measurable monosaccharides. These, however, may derive from different glycans that are built with the same monosaccharides, hence this approach does not distinguish between glycans in natural samples. Here we use enzymes to selectively digest and thereby quantify laminarin in particulate organic matter...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28209775/evidence-for-environmental-and-ecological-selection-in-a-microbe-with-no-geographic-limits-to-gene-flow
#9
Kerry A Whittaker, Tatiana A Rynearson
The ability for organisms to disperse throughout their environment is thought to strongly influence population structure and thus evolution of diversity within species. A decades-long debate surrounds processes that generate and support high microbial diversity, particularly in the ocean. The debate concerns whether diversification occurs primarily through geographic partitioning (where distance limits gene flow) or through environmental selection, and remains unresolved due to lack of empirical data. Here we show that gene flow in a diatom, an ecologically important eukaryotic microbe, is not limited by global-scale geographic distance...
February 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28208105/the-impact-of-damming-on-riverine-fluxes-to-the-ocean-a-case-study-from-eastern-iceland
#10
Eydis Salome Eiriksdottir, Eric H Oelkers, Jorunn Hardardottir, Sigurdur Reynir Gislason
Anthropogenic water management has extensively altered the world's river systems through impoundments and channel diversions to meet the human's need for water, energy and transportation. To illuminate the effect of such activities on the environment, this study describes the impact of the installation of the Kárahnjúkar Dam in Eastern Iceland on the transport of riverine dissolved- and particulate material to the ocean by the Jökulsá á Dal and the Lagarfljót rivers. This dam, completed in 2007, collects water into the 2...
December 19, 2016: Water Research
https://www.readbyqxmd.com/read/28205600/non-reliance-of-metazoans-on-stromatolite-forming-microbial-mats-as-a-food-resource
#11
Gavin M Rishworth, Renzo Perissinotto, Matthew S Bird, Nadine A Strydom, Nasreen Peer, Nelson A F Miranda, Jacqueline L Raw
Grazing and burrowing organisms usually homogenise microalgal mats that form on benthic sediments of many aquatic ecosystems. In the absence of this disruption, microalgal mats can accrete laminated deposits (stromatolites). Stromatolites are rare in modern coastal ecosystems, but persist at locations where metazoans are largely excluded. This study aimed to assess the trophic structure at stromatolite locations where metazoans co-occur, to determine the grazing influence exerted by the metazoans on the stromatolite-forming microalgae (cyanobacteria and diatoms)...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205216/the-diagnostic-value-of-quantitative-assessment-of-diatom-test-for-drowning-an-analysis-of-128-water-related-death-cases-using-microwave-digestion-vacuum-filtration-automated-scanning-electron-microscopy
#12
Jian Zhao, Chao Liu, Adham Sameer A Bardeesi, Yeda Wu, Yanbing Ma, Sunlin Hu, He Shi, Jianding Cheng
The value of diatom test for the diagnosis of drowning remains controversial. The conventional forensic diatom test with low sensitivity is not a useful tool to provide accurate information about diatom in the tissues and organs. To improve the sensitivity of the diatom test, we developed a novel method called the Microwave Digestion-Vacuum Filtration-Automated Scanning Electron Microscopy (MD-VF-Auto SEM) method which resulted in a high recovery of diatoms. In this article, we analyzed 128 water-related death cases...
February 15, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28202243/potential-toxicity-of-ionic-liquid-c12mim-bf4-on-the-growth-and-biochemical-characteristics-of-a-marine-diatom-phaeodactylum-tricornutum
#13
Xiang-Yuan Deng, Da Li, Ling Wang, Xiao-Li Hu, Jie Cheng, Kun Gao
Recently, some researchers have pointed out that the threats of ionic liquids (ILs) to aquatic environment cannot be ignored. Thus, this study investigated the potential toxicity of 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12mim]BF4) on a marine diatom Phaeodactylum tricornutum at population, biochemical and physiological levels using 96h growth tests with a batch-culture system. Results showed that [C12mim]BF4 was very stable in aquatic environment during 96h of exposure. The growth of P. tricornutum was significantly inhibited by [C12mim]BF4 with 24, 48, 72 and 96h EC50 values of 0...
February 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28192486/ocean-acidification-modulates-expression-of-genes-and-physiological-performance-of-a-marine-diatom
#14
Yahe Li, Shufang Zhuang, Yaping Wu, Honglin Ren, Fangyi Chen, Xin Lin, Kejian Wang, John Beardall, Kunshan Gao
Ocean Acidification (OA) is known to affect various aspects of physiological performances of diatoms, but little is known about the underlining molecular mechanisms involved. Here, we show that in the model diatom Phaeodactylum tricornutum, the expression of key genes associated with photosynthetic light harvesting as well as those encoding Rubisco, carbonic anhydrase, NADH dehydrogenase and nitrite reductase, are modulated by OA (1000 μatm, pHnbs 7.83). Growth and photosynthetic carbon fixation were enhanced by elevated CO2...
2017: PloS One
https://www.readbyqxmd.com/read/28192469/diatoms-on-the-carapace-of-common-snapping-turtles-luticola-spp-dominate-despite-spatial-variation-in-assemblages
#15
Shelly C Wu, Elizabeth A Bergey
Filamentous algae are often visible on the carapaces of freshwater turtles and these algae are dominated by a few species with varying geographic distributions. Compared to filamentous algae, little is known about the much more speciose microalgae on turtles. Our objectives were to compare the diatom flora on a single turtle species (the common snapping turtle, Chelydra serpentina) across part of its range to examine spatial patterns and determine whether specific diatom taxa were consistently associated with turtles (as occurs in the filamentous alga Basicladia spp...
2017: PloS One
https://www.readbyqxmd.com/read/28188702/control-of-chitin-nanofiber-production-by-the-lipid-producing-diatom-cyclotella-sp-through-fed-batch-addition-of-dissolved-silicon-and-nitrate-in-a-bubble-column-photobioreactor
#16
Omar Chiriboga, Gregory L Rorrer
Diatoms are single-celled algae that make cell walls of nanopatterned biogenic silica called frustules through metabolic uptake of dissolved silicon and its templated condensation into biosilica. The centric marine diatom Cyclotella sp. also produces intracellular lipids and the valued co-product chitin, an N-acetyl glucosamine biopolymer that is extruded from selected frustule pores as pure nanofibers. The goal of this study was to develop a nutrient feeding strategy to control the production of chitin nanofibers from Cyclotella with the co-production of biofuel lipids...
February 11, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28187324/differential-impacts-of-global-change-variables-on-coastal-south-atlantic-phytoplankton-role-of-seasonal-variations
#17
Marco J Cabrerizo, Presentación Carrillo, Virginia E Villafañe, E Walter Helbling
Global change is associated to the increase in temperature (T), nutrient inputs (Nut) and solar radiation in the water column. To address their joint impact on the net community production [NCP], respiration [CR] and PSII performance (ΦPSII) of coastal phytoplankton communities from the South Atlantic Ocean over a seasonal succession, we performed a factorial design. For this, we used a 2 × 2 × 2 matrix set-up, with and without UVR, ambient and enriched nutrients, and in situ T and in situ T + 3 °C...
January 24, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28187245/molecular-phylogeny-and-ultrastructure-of-aphelidium-desmodesmi-a-new-species-in-aphelida-opisthosporidia
#18
Peter M Letcher, Martha J Powell, Philip A Lee, Salvador Lopez, Micheal Burnett
Aphelids are a diverse group of intracellular parasitoids of algae and diatoms, and are sister to true fungi. Included in four genera, the 14 described species utilize phagocytosis as their mode of nutrition, and the life cycles of these taxa are remarkably similar. However, their putative specificity of host, morphological and ultrastructural features, and genetic divergence have been considered in taxon delineation. Here we examine the host specificity, morphology, ultrastructure, and molecular 18S gene sequence of a new species in Aphelida, Aphelidium desmodesmi sp...
February 10, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28186097/mismatch-between-marine-plankton-range-movements-and-the-velocity-of-climate-change
#19
William J Chivers, Anthony W Walne, Graeme C Hays
The response of marine plankton to climate change is of critical importance to the oceanic food web and fish stocks. We use a 60-year ocean basin-wide data set comprising >148,000 samples to reveal huge differences in range changes associated with climate change across 35 plankton taxa. While the range of dinoflagellates and copepods tended to closely track the velocity of climate change (the rate of isotherm movement), the range of the diatoms moved much more slowly. Differences in range shifts were up to 900 km in a recent warming period, with average velocities of range movement between 7 km per decade northwards for taxa exhibiting niche plasticity and 99 km per decade for taxa exhibiting niche conservatism...
February 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28181560/responses-of-the-marine-diatom-thalassiosira-pseudonana-to-changes-in-co2-concentration-a-proteomic-approach
#20
Romain Clement, Sabrina Lignon, Pascal Mansuelle, Erik Jensen, Matthieu Pophillat, Regine Lebrun, Yann Denis, Carine Puppo, Stephen C Maberly, Brigitte Gontero
The concentration of CO2 in many aquatic systems is variable, often lower than the KM of the primary carboxylating enzyme Rubisco, and in order to photosynthesize efficiently, many algae operate a facultative CO2 concentrating mechanism (CCM). Here we measured the responses of a marine diatom, Thalassiosira pseudonana, to high and low concentrations of CO2 at the level of transcripts, proteins and enzyme activity. Low CO2 caused many metabolic pathways to be remodeled. Carbon acquisition enzymes, primarily carbonic anhydrase, stress, degradation and signaling proteins were more abundant while proteins associated with nitrogen metabolism, energy production and chaperones were less abundant...
February 9, 2017: Scientific Reports
keyword
keyword
31400
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"