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  • 1
    Online Resource
    Online Resource
    Induced Mutations in Plant Breeding. (1983)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (250 pages)
    Edition: 1st ed.
    ISBN: 9783642819971
    Series Statement: Monographs on Theoretical and Applied Genetics Series ; v.7
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6574410
    Language: English
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    GEOMAR EBL
  • 2
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    Production of siderophore type chelates in Atlantic Ocean waters enriched with different carbon and nitrogen sources (2011)
    Elsevier
    In:  Marine Chemistry, 124 (1-4). pp. 90-99.
    Details
    Publication Date: 2017-10-24
    Description: Siderophore type chelates were detected in nutrient enriched, incubated seawater collected from different biogeographical regions of the Atlantic Ocean. Seawater was enriched with glucose and ammonium, glycine (as a source of carbon and nitrogen) or chitin and ammonium at different concentrations and was incubated for up to 3-4. days in the dark. Siderophore type chelates were detected using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS) after complexation with Ga. Samples were subsequently analysed by HPLC-electrospray ionisation mass spectrometry (HPLC-ESI-MS) in order to confirm the identity of the known siderophores, and to obtain the pseudo-molecular ions of unknown siderophore type chelates. A total of 22 different siderophore type chelates were resolved in the HPLC-ICP-MS chromatograms. Ten different siderophore type chelates were identified by HPLC-ESI-MS, 3 of which had not previously been identified in nutrient enriched seawater incubations. The concentration and diversity of siderophore type chelates was highest in seawater amended with glucose. The concentrations and diversity of siderophore type chelates also varied with biogeographical area in the Atlantic Ocean, with the North Atlantic Sub-tropical Gyre yielding highest concentrations in incubations, and the South Atlantic Sub-tropical Gyre and Western Tropical Atlantic yielding the highest diversity
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.marchem.2010.12.005
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Hydroxamate siderophores: Occurrence and importance in the Atlantic Ocean (2008)
    American Chemistry Society
    In:  Environmental Science and Technology, 42 (23). pp. 8675-8680.
    Details
    Publication Date: 2017-10-24
    Description: Siderophores are chelates produced by bacteria as part of a highly specific iron uptake mechanism. They are thought to be important in the bacterial acquisition of iron in seawater and to influence iron biogeochemistry in the ocean. We have identified and quantified two types of siderophores in seawater samples collected from the Atlantic Ocean. These siderophores were identified as hydroxamate siderophores, both ferrioxamine species representative of the more soluble marine siderophores characterized to date. Ferrioxamine G was widely distributed in surface waters throughout the Atlantic Ocean, while ferrioxamine E had a more varied distribution. Total concentrations of the two siderophores were between 3 and 20 pM in the euphotic zone. If these compounds are fully complexed in seawater, they represent approximately 0.2-4.6 of the 〈0.2 μm iron pool. Our data confirm that siderophore-mediated iron acquisition is important for marine heterotrophic bacteria and indicate that siderophores play an important role in the oceanic biogeochemical cycling of iron. © 2008 American Chemical Society.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1021/es801884r
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Organic matter quality and supply to deep-water coral/mound systems of the NW European Continental Margin (2007)
    Springer
    In:  International Journal of Earth Sciences, 96 (1). pp. 159-170.
    Details
    Publication Date: 2015-09-21
    Description: Comparison of five deep-water coral (DWC)/mound ecosystems along the European Continental Margin shows that suspended particulate organic matter (sPOM), a potential food source, is lipid rich and of high quality. However, there are differences between the sites. The Darwin and Pelagia Mounds (N. Rockall Trough and N. Porcupine Bank, respectively) have higher proportions of labile particulate lipids (including high proportions of polyunsaturated fatty acids) in the benthic boundary layer than Logachev, Hovland and Belgica Mounds (Rockall Bank, S. Porcupine Bank and Porcupine Seabight, respectively). The high quality sPOM could be transported downslope from the euphotic zone. There is some evidence for inter-annual variability at some sites (e.g. Hovland and Logachev Mounds) as large differences in suspended lipid and particulate organic carbon concentrations were observed over the sampling period. Elevated total organic carbon contents of sediments at mound sites, relative to control sites in some cases (particularly Darwin Mounds), probably reflect local hydrodynamic control and the trapping of sPOM by the DWC. Fresh POM can be relatively rapidly transferred to significant depth (up to 8 cm) through bioturbation that is evident at all sites. There is no clear evidence of present day hydrocarbon seepage at any of the sites.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00531-006-0078-6
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Phosphorus cycling in the North and South Atlantic Ocean subtropical gyres (2008)
    Nature Publishing Group
    In:  Nature Geoscience, 1 (7). pp. 439-443.
    Details
    Publication Date: 2017-02-23
    Description: Despite similar physical properties, the Northern and Southern Atlantic subtropical gyres have different biogeochemical regimes. The Northern subtropical gyre, which is subject to iron deposition from Saharan dust1, is depleted in the nutrient phosphate, possibly as a result of iron-enhanced nitrogen fixation2. Although phosphate depleted, rates of carbon fixation in the euphotic zone of the North Atlantic subtropical gyre are comparable to those of the South Atlantic subtropical gyre3, which is not phosphate limited. Here we use the activity of the phosphorus-specific enzyme alkaline phosphatase to show potentially enhanced utilization of dissolved organic phosphorus occurring over much of the North Atlantic subtropical gyre. We find that during the boreal spring up to 30% of primary production in the North Atlantic gyre is supported by dissolved organic phosphorus. Our diagnostics and composite map of the surface distribution of dissolved organic phosphorus in the subtropical Atlantic Ocean reveal shorter residence times in the North Atlantic gyre than the South Atlantic gyre. We interpret the asymmetry of dissolved organic phosphorus cycling in the two gyres as a consequence of enhanced nitrogen fixation in the North Atlantic Ocean4, which forces the system towards phosphorus limitation. We suggest that dissolved organic phosphorus utilization may contribute to primary production in other phosphorus-limited ocean settings as well.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/ngeo232
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    How widespread and important is N2 fixation in the North Atlantic Ocean? (2007)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 21 . GB4015.
    Details
    Publication Date: 2018-03-21
    Description: The spatial extent of N2 fixation in the Atlantic Ocean is examined by determining the isotopic composition of N in suspended particulate organic nitrogen (δ15N PONsusp). The samples were collected from zonal and meridional transects of the Atlantic Ocean during a 3‐year period. There is a consistent depleted δ15N PONsusp signal extending over the center of the northern subtropical gyre, which partly coincides with a region where the tracer N* increases westward following the gyre circulation. This nonconservative behavior of N* implies that N2 fixation is responsible for the depleted δ15N PONsusp. A mixing model suggests that N2 fixation over parts of the northern gyre provides up to 74% of the N utilized by phytoplankton. However, since the PONsusp represents only a small fraction of the total N pool, N2 fixation probably only plays a minor role in supplying new N to the euphotic zone in the surface waters of the northern subtropical gyre.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2006GB002886
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Perinatal exercise improves glucose homeostasis in adult offspring (2012)
    The American Physiological Society (APS)
    Details
    Publication Date: 2012-10-16
    Description: Emerging research has shown that subtle factors during pregnancy and gestation can influence long-term health in offspring. In an attempt to be proactive, we set out to explore whether a nonpharmacological intervention, perinatal exercise, might improve offspring health. Female mice were separated into sedentary or exercise cohorts, with the exercise cohort having voluntary access to a running wheel prior to mating and during pregnancy and nursing. Offspring were weaned, and analyses were performed on the mature offspring that did not have access to running wheels during any portion of their lives. Perinatal exercise caused improved glucose disposal following an oral glucose challenge in both female and male adult offspring ( P 〈 0.05 for both). Blood glucose concentrations were reduced to lower values in response to an intraperitoneal insulin tolerance test for both female and male adult offspring of parents with access to running wheels ( P 〈 0.05 and P 〈 0.01, respectively). Male offspring from exercised dams showed increased percent lean mass and decreased fat mass percent compared with male offspring from sedentary dams ( P 〈 0.01 for both), but these parameters were unchanged in female offspring. These data suggest that short-term maternal voluntary exercise prior to and during healthy pregnancy and nursing can enhance long-term glucose homeostasis in offspring.
    Print ISSN: 0193-1849
    Electronic ISSN: 1522-1555
    Topics: Medicine
    Published by The American Physiological Society (APS)
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    PAPER CURRENT
  • 8
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    Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-05-26
    Description: Precise timekeeping is critical to metrology, forming the basis by which standards of time, length, and fundamental constants are determined. Stable clocks are particularly valuable in spectroscopy because they define the ultimate frequency precision that can be reached. In quantum metrology, the qubit coherence time defines the clock stability, from which the spectral linewidth and frequency precision are determined. We demonstrate a quantum sensing protocol in which the spectral precision goes beyond the sensor coherence time and is limited by the stability of a classical clock. Using this technique, we observed a precision in frequency estimation scaling in time T as T –3/2 for classical oscillating fields. The narrow linewidth magnetometer based on single spins in diamond is used to sense nanoscale magnetic fields with an intrinsic frequency resolution of 607 microhertz, which is eight orders of magnitude narrower than the qubit coherence time.
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
    Electronic Resource
    Electronic Resource
    The Basle PEEP weaner (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 32 (1977), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1977.tb10005.x
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    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    De novo expansion of a (CAG) n repeat in sporadic Huntington's disease (1993)
    [s.l.] : Nature Publishing Group
    Nature genetics 5 (1993), S. 168-173 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Huntington's disease (HD) chromosomes contain an expanded unstable (CAG)n repeat in chromosome 4p16.3. We have examined nine families with potential de novo expression of the disease. With one exception, all of the affected individuals had 42 or more repeat units, well above the normal range. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1093-168
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    Paper (German National Licenses)
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