نتایج جستجو برای: diatoms

تعداد نتایج: 5070  

2017
Scott Meyerink Michael J. Ellwood William A. Maher Robert Strzepek

Citation: Meyerink S, Ellwood MJ, Maher WA and Strzepek R (2017) Iron Availability Influences Silicon Isotope Fractionation in Two Southern Ocean Diatoms (Proboscia inermis and Eucampia antarctica) and a Coastal Diatom (Thalassiosira pseudonana). Front. Mar. Sci. 4:217. doi: 10.3389/fmars.2017.00217 Iron Availability Influences Silicon Isotope Fractionation in Two Southern Ocean Diatoms (Probos...

2010
E. Virginia Armbrust

microscopic, eukaryotic phytoplankton known as diatoms. These photosynthetic workhorses are found in waters worldwide, wherever there is sufficient light and nutrients. Their name is derived from the Greek diatomos, meaning ‘cut in half ’, a reference to their distinctive two-part cell walls made of silica (Fig. 1). Each year, diatom photosynthesis in the sea generates about as much organic car...

Journal: :iranian journal of science and technology (sciences) 2007
m. sharifi

the influence of the herbivorous snail (physa sp.) on the algal periphyton community from thegamasiyab river, kermanshah province in western iran was examined by establishing a gradient of physa sp.density in artificial streams. the impact of physa grazing was evaluated by measuring dry mass, ash-free drymass (afdm) and chlorophyll a in the periphyton community. snails significantly depressed p...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Erin M Bertrand Andrew E Allen Christopher L Dupont Trina M Norden-Krichmar Jing Bai Ruben E Valas Mak A Saito

Diatoms are responsible for ~40% of marine primary production and are key players in global carbon cycling. There is mounting evidence that diatom growth is influenced by cobalamin (vitamin B(12)) availability. This cobalt-containing micronutrient is only produced by some bacteria and archaea but is required by many diatoms and other eukaryotic phytoplankton. Despite its potential importance, l...

Journal: :PLoS ONE 2008
Peter G. Kroth Anthony Chiovitti Ansgar Gruber Veronique Martin-Jezequel Thomas Mock Micaela Schnitzler Parker Michele S. Stanley Aaron Kaplan Lise Caron Till Weber Uma Maheswari E. Virginia Armbrust Chris Bowler

BACKGROUND Diatoms are unicellular algae responsible for approximately 20% of global carbon fixation. Their evolution by secondary endocytobiosis resulted in a complex cellular structure and metabolism compared to algae with primary plastids. METHODOLOGY/PRINCIPAL FINDINGS The whole genome sequence of the diatom Phaeodactylum tricornutum has recently been completed. We identified and annotate...

2018
Naicheng Wu Claas Faber Uta Ulrich Nicola Fohrer

Background The separation of runoff components within a model simulation is of great importance for a successful implementation of management measures. Diatoms could be a promising indicator for tile drainage flow due to their diverse preferences to different aquatic habitats. In this study, we collected diatom samples of 9 sites (4 tile drainage, TD, and 5 river sites, Ri) in a German lowland ...

2016
Gang Li Amy D. Woroch Natalie A. Donaher Amanda M. Cockshutt Douglas A. Campbell

Marine diatoms are photosynthetic, and thrive in environments where light fluctuates. Like all oxygenic photosynthetic organisms diatoms face a light-dependent inactivation of the Photosystem II complexes that photooxidize water to generate biosynthetic reductant. To maintain photosynthesis this photoinactivation must be countered by slow and metabolically expensive protein turnover, which is l...

2004
Oliver Kilian Iwona Adamska Peter G Kroth

Diatoms and a variety of other algae evolved by secondary endocytobiosis, i.e. by uptake of a eukaryotic alga into a eukaryotic host cell and the subsequent transformation of the endosymbiont into an organelle. Due to this explicit evolutionary history diatoms possess plastids bound by four membranes. Nucleus encoded plastid preproteins in diatoms have N-terminal bipartite presequences consisti...

Journal: :international journal of environmental research 0
a.v. hallare department of biology, cas, university of the philippines manila, padre faura, manila 1000. philippines, institute for environmental research, rwth aachen university, worringerweg 152074 aachen, germany k.j.a. lasafin department of biology, cas, university of the philippines manila, padre faura, manila 1000. philippines j.r. magallanes department of biology, cas, university of the philippines manila, padre faura, manila 1000. philippines

the present study reports the changes in the phytoplankton community structure in taklong island national marine reserve (tinmar), guimaras island, philippines. quantification of pah yielded undetectable results, whereas, primary productivity, phytoplankton density, and diversity values were higher as compared to samples before the oil spill and samples from the reference site. sixty-nine gener...

Journal: :Botanical Gazette 1908

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