نتایج جستجو برای: diatoms

تعداد نتایج: 5070  

Journal: :Proceedings of the Royal Society B: Biological Sciences 2009
Monika Winder John E. Reuter S. Geoffrey Schladow

Diatoms contribute to a substantial portion of primary production in the oceans and many lakes. Owing to their relatively heavy cell walls and high nutrient requirements, planktonic diatoms are expected to decrease with climate warming because of reduced nutrient redistribution and increasing sinking velocities. Using a historical dataset, this study shows that diatoms were able to maintain the...

2006
Andrew J. Alverson Jamie J. Cannone Robin R. Gutell Edward C. Theriot

Diatoms have been classified historically as either centric or pennate based on a number of features, cell outline foremost among them. The consensus among nearly every estimate of the diatom phylogeny is that the traditional pennate diatoms (Pennales) constitute a well-supported clade, whereas centric diatoms do not. The problem with the centric–pennate classification was highlighted by some r...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Harriet Alexander Bethany D Jenkins Tatiana A Rynearson Sonya T Dyhrman

Diverse communities of marine phytoplankton carry out half of global primary production. The vast diversity of the phytoplankton has long perplexed ecologists because these organisms coexist in an isotropic environment while competing for the same basic resources (e.g., inorganic nutrients). Differential niche partitioning of resources is one hypothesis to explain this "paradox of the plankton,...

2017
Sung Min An Dong Han Choi Jung Ho Lee Howon Lee Jae Hoon Noh

Benthic diatoms isolated from tidal flats in the west coast of Korea were identified through both traditional morphological method and molecular phylogenetic method for methodological comparison. For the molecular phylogenetic analyses, we sequenced the 18S rRNA and the ribulose bisphosphate carboxylase large subunit coding gene, rbcL. Further, the comparative analysis allowed for the assessmen...

2009
Guillaume Sapriel Michelle Quinet Marc Heijde Laurent Jourdren Véronique Tanty Guangzuo Luo Stéphane Le Crom Pascal Jean Lopez

BACKGROUND Diatoms are largely responsible for production of biogenic silica in the global ocean. However, in surface seawater, Si(OH)(4) can be a major limiting factor for diatom productivity. Analyzing at the global scale the genes networks involved in Si transport and metabolism is critical in order to elucidate Si biomineralization, and to understand diatoms contribution to biogeochemical c...

2016
Colleen A. Durkin Julie A. Koester Sara J. Bender E. Virginia Armbrust

Diatoms are highly productive single-celled algae that form an intricately patterned silica cell wall after every cell division. They take up and utilize silicic acid from seawater via silicon transporter (SIT) proteins. This study examined the evolution of the SIT gene family to identify potential genetic adaptations that enable diatoms to thrive in the modern ocean. By searching for sequence ...

2014
Shiyong Sun Faqin Dong Hermann Ehrlich Xueqing Zhao Mingxue Liu Qunwei Dai Qiongfang Li Dejun An Hailiang Dong

Diatoms are a highly diversified group of algae that are widely distributed in aquatic ecosystems, and various species have different nutrient and temperature requirements for optimal growth. Here, we describe unusual psychrophilic diatoms of Cymbella in a travertine deposition environment in southwestern China in winter season.Travertine surfaces are colonized by these psychrophilic diatoms, w...

2011
Florian Maumus Pablo Rabinowicz Chris Bowler Maximo Rivarola

Epigenetics include DNA methylation, the modification of histone tails that affect chromatin states, and small RNAs that are involved in the setting and maintenance of chromatin modifications. Marine stramenopiles (MAS), which are a diverse assemblage of algae that acquired photosynthesis from secondary endosymbiosis, include single-celled organisms such as diatoms as well as multicellular form...

2013
Peter Stief Anja Kamp Dirk de Beer

Intracellular nitrate storage allows microorganisms to survive fluctuating nutrient availability and anoxic conditions in aquatic ecosystems. Here we show that diatoms, ubiquitous and highly abundant microalgae, represent major cellular reservoirs of nitrate in an intertidal flat of the German Wadden Sea and are potentially involved in anaerobic nitrate respiration. Intracellular nitrate (ICNO3...

Journal: :PLoS ONE 2008
Sacha Coesel Miroslav Oborník Joao Varela Angela Falciatore Chris Bowler

Carotenoids are produced by all photosynthetic organisms, where they play essential roles in light harvesting and photoprotection. The carotenoid biosynthetic pathway of diatoms is largely unstudied, but is of particular interest because these organisms have a very different evolutionary history with respect to the Plantae and are thought to be derived from an ancient secondary endosymbiosis be...

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