ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Global distributions of marine Cyanobacteria [Ecology] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-06-12
    Description: The Cyanobacteria Prochlorococcus and Synechococcus account for a substantial fraction of marine primary production. Here, we present quantitative niche models for these lineages that assess present and future global abundances and distributions. These niche models are the result of neural network, nonparametric, and parametric analyses, and they rely on 〉35,000...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Decoupling of net community and export production on submesoscales in the Sargasso Sea (2015)
    Wiley
    Details
    Publication Date: 2015-07-19
    Description: Determinations of the net community production (NCP) in the upper ocean and the particle export production (EP) should balance over long time and large spatial scales. However, recent modeling studies suggest that a horizontal decoupling of flux-regulating processes on submesoscales (≤10 km) could lead to imbalances between individual determinations of NCP and EP. Here we sampled mixed-layer biogeochemical parameters and proxies for NCP and EP during ten, high spatial-resolution (~2 km) surface transects across strong physical gradients in the Sargasso Sea. We observed strong biogeochemical and carbon flux variability in nearly all transects. Spatial coherence among measured biogeochemical parameters within transects was common, but rarely did the same parameters co-vary consistently across transects. Spatial variability was greater in parameters associated with higher trophic levels, such as chlorophyll in 〉 5.0 µm particles, and variability in EP exceeded that of NCP in nearly all cases. Within sampling transects, coincident EP and NCP determinations were uncorrelated. However when averaged over each transect (30 to 40 km in length), we found NCP and EP to be significantly and positively correlated (R = 0.72, p = 0.04). Transect-averaged EP determinations were slightly smaller than similar NCP values (Type-II regression slope of 0.93, std = 0.32); but not significantly different from a 1:1 relationship. The results show the importance of appropriate sampling scales when deriving carbon flux budgets from upper ocean observations.
    Print ISSN: 0886-6236
    Electronic ISSN: 1944-9224
    Topics: Biology , Chemistry and Pharmacology , Geography , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Phytoplankton in the ocean use non-phosphorus lipids in response to phosphorus scarcity (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-02-03
    Description: Phosphorus is an obligate requirement for the growth of all organisms; major biochemical reservoirs of phosphorus in marine plankton include nucleic acids and phospholipids. However, eukaryotic phytoplankton and cyanobacteria (that is, 'phytoplankton' collectively) have the ability to decrease their cellular phosphorus content when phosphorus in their environment is scarce. The biochemical mechanisms that allow phytoplankton to limit their phosphorus demand and still maintain growth are largely unknown. Here we show that phytoplankton, in regions of oligotrophic ocean where phosphate is scarce, reduce their cellular phosphorus requirements by substituting non-phosphorus membrane lipids for phospholipids. In the Sargasso Sea, where phosphate concentrations were less than 10 nmol l-1, we found that only 1.3 +/- 0.6% of phosphate uptake was used for phospholipid synthesis; in contrast, in the South Pacific subtropical gyre, where phosphate was greater than 100 nmol l-1, plankton used 17 6% (ref. 6). Examination of the planktonic membrane lipids at these two locations showed that classes of sulphur- and nitrogen-containing membrane lipids, which are devoid of phosphorus, were more abundant in the Sargasso Sea than in the South Pacific. Furthermore, these non-phosphorus, 'substitute lipids' were dominant in phosphorus-limited cultures of all of the phytoplankton species we examined. In contrast, the marine heterotrophic bacteria we examined contained no substitute lipids and only phospholipids. Thus heterotrophic bacteria, which compete with phytoplankton for nutrients in oligotrophic regions like the Sargasso Sea, appear to have a biochemical phosphorus requirement that phytoplankton avoid by using substitute lipids. Our results suggest that phospholipid substitutions are fundamental biochemical mechanisms that allow phytoplankton to maintain growth in the face of phosphorus limitation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Mooy, Benjamin A S -- Fredricks, Helen F -- Pedler, Byron E -- Dyhrman, Sonya T -- Karl, David M -- Koblizek, Michal -- Lomas, Michael W -- Mincer, Tracy J -- Moore, Lisa R -- Moutin, Thierry -- Rappe, Michael S -- Webb, Eric A -- England -- Nature. 2009 Mar 5;458(7234):69-72. doi: 10.1038/nature07659.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. bvanmooy@whoi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19182781" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/analysis ; *Lipid Metabolism ; Lipids/*chemistry ; Membrane Lipids/chemistry ; Nitrogen/analysis/metabolism ; Oceans and Seas ; Phosphates/metabolism ; Phospholipids/biosynthesis ; Phosphorus/analysis/*deficiency ; Phytoplankton/*metabolism ; Seawater/*chemistry/microbiology ; Synechococcus/chemistry/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    Environmental genome shotgun sequencing of the Sargasso Sea (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-04-07
    Description: We have applied "whole-genome shotgun sequencing" to microbial populations collected en masse on tangential flow and impact filters from seawater samples collected from the Sargasso Sea near Bermuda. A total of 1.045 billion base pairs of nonredundant sequence was generated, annotated, and analyzed to elucidate the gene content, diversity, and relative abundance of the organisms within these environmental samples. These data are estimated to derive from at least 1800 genomic species based on sequence relatedness, including 148 previously unknown bacterial phylotypes. We have identified over 1.2 million previously unknown genes represented in these samples, including more than 782 new rhodopsin-like photoreceptors. Variation in species present and stoichiometry suggests substantial oceanic microbial diversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Venter, J Craig -- Remington, Karin -- Heidelberg, John F -- Halpern, Aaron L -- Rusch, Doug -- Eisen, Jonathan A -- Wu, Dongying -- Paulsen, Ian -- Nelson, Karen E -- Nelson, William -- Fouts, Derrick E -- Levy, Samuel -- Knap, Anthony H -- Lomas, Michael W -- Nealson, Ken -- White, Owen -- Peterson, Jeremy -- Hoffman, Jeff -- Parsons, Rachel -- Baden-Tillson, Holly -- Pfannkoch, Cynthia -- Rogers, Yu-Hui -- Smith, Hamilton O -- New York, N.Y. -- Science. 2004 Apr 2;304(5667):66-74. Epub 2004 Mar 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Biological Energy Alternatives, 1901 Research Boulevard, Rockville, MD 20850, USA. jcventer@tcag.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15001713" target="_blank"〉PubMed〈/a〉
    Keywords: Archaea/*genetics ; Atlantic Ocean ; Bacteria/*genetics ; Bacteriophages/genetics ; Biodiversity ; Computational Biology ; Cyanobacteria/genetics/growth & development/metabolism ; *Ecosystem ; Eukaryotic Cells ; Genes, Archaeal ; Genes, Bacterial ; Genes, rRNA ; Genome, Archaeal ; *Genome, Bacterial ; *Genomics ; Molecular Sequence Data ; Photosynthesis ; Phylogeny ; Plasmids ; Rhodopsin/genetics ; Rhodopsins, Microbial ; Seawater/*microbiology ; *Sequence Analysis, DNA ; Water Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    Electronic Resource
    Electronic Resource
    Organic nitrogen uptake and growth by the chrysophyte Aureococcus anophagefferens during a brown tide event (1997)
    Springer
    Marine biology 129 (1997), S. 377-387 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The quantitative importance of light-mediated, dissolved organic nitrogen (DON) utilization in relation to overall nitrogen-assimilation in Aureococcusanophagefferens Hargraves et Sieburth was assessed during a brown tide event in Shinnecock Bay, Long Island, 24 through 26 July 1995. The growth response of A. anophagefferens was maximal in organic-rich Bay water and decreased proportional to the organic:inorganic nutrient ratio of the water. Short-term uptake measurements with six nitrogenous substrates revealed that reduced nitrogen could potentially represent 95% of overall nitrogen uptake of which 70% was due to organic nitrogen alone. Potential uptake of urea by the A. anophagefferens-dominated bloom was substan tially greater than uptake of the other substrates tested during the study, contributing the largest percentage of total nitrogen uptake (58 to 64%; ρ′ max(urea) 4.4 μg  atom N l−1 h−1), followed by NH4 + (18 to 26%; ρ′max(NH4+) 2 μg atom N l−1 h−1). The combined rates of uptake of algal extract, lysine and glutamic acid contributed between 11 and 16% of total uptake, whereas NO3 −contributed 5 to 8%. Based on the kinetic determinations from this study we suggest an ecological framework for the events leading to the dominance and abundance of A. anophagefferens in coastal bays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050178
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Interactions between NH+4 and NO−3 uptake and assimilation: comparison of diatoms and dinoflagellates at several growth temperatures (1999)
    Springer
    Marine biology 133 (1999), S. 541-551 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ammonium concentrations of ∼1 M are commonly cited as being the threshold for inhibition of NO3 − uptake, but the applicability of this threshold to phytoplankton from different taxonomic classes has rarely been examined. Additionally, little is known about the influence of environmental variables (e.g. growth temperature) on the interaction between ambient NH4 + and NO3 − uptake. Four species of estuarine phytoplankton, two diatom [Chaetoceros sp., and Thalassiosira weissflogii (Grunow) Fryxell et Hasle] and two dinoflagellate [Prorocentrum minimum (Pavillard) Schiller, and Gyrodinium uncatenum Hulburt], were grown on NO3 − at several different temperatures (4, 10, 15, or 20 °C), and the impact of NH4 + additions on NO3 − uptake/assimilation (non-TCA-extracted) and assimilation (TCA-extracted) was assessed. For all species at all temperatures, NO3 − uptake/assimilation and assimilation rates decreased in a roughly exponential manner with increasing NH4 + concentrations but were not completely inhibited even at elevated NH4 + concentrations of 200 μM. Estimated half-inhibition concentrations (K i) were significantly greater in the diatom species (mean ± SE; 2.70 ± 0.67 μM) than in the dinoflagellate species (1.26 ± 0.55 μM). Half-inhibition constants were positively related to temperature-limited relative growth rate although not significantly. The observed inhibition of NO3 − uptake and assimilation, as a percentage of NO3 − uptake in the absence of NH4 +, averaged about 80% and ranged from 49 to 100%. For all species, a significant (P 〈 0.001) positive correlation was found between percent inhibition of NO3 − assimilation and temperature-limited relative growth rate. Two experiments on Chesapeake Bay phytoplankton during an April 1998 diatom bloom showed that in short-term (∼1 h) temperature manipulation experiments, percent inhibition of NO3 − uptake/assimilation was also positively related (P = 0.05) to experimental temperature. The observed relationships between temperature-limited relative growth rate and percent inhibition of NO3 − assimilation rates for the species tested suggest that at the enzyme level, the inhibitory mechanism of NO3 − assimilation is similar among species, but at the whole cell level may be regulated by species-specific differences in the accumulation of internal metabolites. These findings add not only to our understanding of species-specific variability and the role of growth temperature, but also provide additional data with which to evaluate current models of NH4 + and NO3 − interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050494
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    facet.materialart.
    Unknown
    Present and future global distributions of the marine Cyanobacteria Prochlorococcus and Synechococcus (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-05-23
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Accumulation and enhanced cycling of polyphosphate by Sargasso Sea plankton in response to low phosphorus (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-04-21
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Phytoplankton diversity and ocean phosphate uptake [Environmental Sciences] (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-12-10
    Description: We have a limited understanding of the consequences of variations in microbial biodiversity on ocean ecosystem functioning and global biogeochemical cycles. A core process is macronutrient uptake by microorganisms, as the uptake of nutrients controls ocean CO2 fixation rates in many regions. Here, we ask whether variations in ocean phytoplankton...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Polyphosphate accumulation in the Sargasso Sea [Earth, Atmospheric, and Planetary Sciences] (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-06-04
    Description: Phytoplankton alter their biochemical composition according to nutrient availability, such that their bulk elemental composition varies across oceanic provinces. However, the links between plankton biochemical composition and variation in biogeochemical cycling of nutrients remain largely unknown. In a survey of phytoplankton phosphorus stress in the western North Atlantic, we found...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...