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  • 1
    Electronic Resource
    Electronic Resource
    The Dead Sea — alive again (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 518-522 
    Details
    ISSN: 1420-9071
    Keywords: Dead Sea ; Halobacteriaceae ; Dunaliella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In the thirteen years of quantitative studies on the microbiology of the Dead Sea from 1980 onwards three distinct periods can be discerned. Mass development of the green unicellular algaDunaliella parva (up to 8,800 cells/ml) and red archaeobacteria (2×107 cells/ml) was observed in 1980, following a dilution of the upper water layers by rain floods. This bloom disappeared at the end of 1982 as a result of a complete mixing of the water column. During the period 1983–1991 the lake was holomictic, and noDunaliella cells were observed. Viable bacteria were present during this period in very low numbers. Heavy rain floods during the winter of 1991–1992 caused a new stratification as the upper five meters of the water column became diluted to 70% of their normal salinity. In this upper water layerDunaliella reappeared (up to 3×104 cells/ml at the beginning of May, rapidly declining to less than 40 cells/ml at the end of July), and a bloom of red archaeobacteria (3×107 cells/ml) once more imparted a red coloration to the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955154
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  • 2
    Electronic Resource
    Electronic Resource
    On the red coloration of saltern crystallizer ponds. II. Additional evidence for the contribution of halobacterial pigments (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 9-13 
    Details
    ISSN: 1573-8590
    Keywords: solar salterns ; Halobacterium ; Dunaliella ; bacterioruberin ; β-carotene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract In a previous paper we attempted to assess the contribution of red bacteria of theHalobacterium — Haloferax — Haloarcula group and of the β-carotene-rich green algaDunaliella salina to the red colour of saltern crystallizer ponds. By means of light absorption measurements, we showed that bacterioruberin contained in the bacteria was mainly responsible for the colour of the brines, in spite of the fact that β-carotene derived fromDunaliella was the pigment present in the greatest amount. This apparent discrepancy was explained by the very smallin vivo optical cross-section of β-carotene, which is densely packed in globules inside theD. salina cells. We recently observed that the centrifugation technique used in the previous study to collect biomass from the ponds was unsuitable for this type of measurements, as a substantial part of theDunaliella cells present did not sediment upon centrifugation due to the low specific gravity caused by the high β-carotene content. Therefore similar measurements were performed with biomass collected by filtration. Again,in vivo absorption spectra were dominated by the absorption peaks of bacterioruberin. The results reported here show that, in spite of the methodological problem associated with the earlier study, all views and conclusions expressed in our earlier paper retain their validity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990638
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  • 3
    Electronic Resource
    Electronic Resource
    A bloom of Dunaliella parva in the Dead Sea in 1992: biological and biogeochemical aspects (1995)
    Springer
    Hydrobiologia 297 (1995), S. 173-185 
    Details
    ISSN: 1573-5117
    Keywords: Dead Sea ; Dunaliella ; hypersaline ; stratification ; carbon isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A bloom of the unicellular green alga Dunaliella parva (up to 15 000 cells m1−1) developed in the upper 5 m of the water column of the Dead Sea in May-June 1992. This was the first mass development of Dunaliella observed in the lake since 1980, when another bloom was reported (up to 8800 cells m1−1). For a bloom of Dunaliella to develop in the Dead Sea, two conditions must be fulfilled: the salinity of the upper water layers must become sufficiently low as a result of dilution with rain floods, and phosphate must be available. During the period 1983–1991 the lake was holomictic, hardly any dilution with rainwater occurred, and no Dunaliella cells were observed. Heavy rain floods in the winter of 1991–1992 caused a new stratification, in which the upper 5 m of the water column became diluted to about 70% of their former salinity. Measurements of the isotopic composition of inorganic carbon in the upper water layer during the bloom (δ13C = 5.1‰) indicate a strong fractionation when compared with the estimated −3.4‰ prior to the bloom. The particulate organic carbon formed was highly enriched in light carbon isotopes (δ 13 C = − 13.5‰). The algal bloom rapidly declined during the months June–July, probably as a result of the formation of resting stages, which sank to the bloom. A smaller secondary bloom (up to 1850 cells m1−1) developed between 6 and 10 m depth at the end of the summer. Salinity values at this deep chlorophyll maximum were much beyond those conductive for the growth of Dunaliella, and the factors responsible for the development of this bloom are still unclear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019283
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of a bloom of halophilic archaea in the Dead Sea (1995)
    Springer
    Hydrobiologia 315 (1995), S. 149-158 
    Details
    ISSN: 1573-5117
    Keywords: Dead Sea ; archaea ; Haloferax ; Dunaliella ; heterotrophic activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After a period of more than ten years in which bacterial and algal community sizes were extremely small, a dense bloom of halophilic archaea developed in the upper 5–10 m of the Dead Sea water column in the summer of 1992. The development of this bloom followed a dilution of the upper water layer by winter rainfloods, which enabled the development of a short-lived dense bloom of the unicellular green alga Dunaliella parva. The dense archaeal community (up to 3.5 × 107 cells m1−1 in June 1992) imparted a red coloration to the Dead Sea, due to its high content of bacterioruberin. Bacteriorhodopsin was not detected. High levels of potential heterotrophic activity were associated with the bloom, as measured by the incorporation of labeled organic substrates. After the decline of the algal bloom, archaeal numbers in the lake decreased only little, and most of the community was still present at the end of 1993. The amount of carotenoid pigment per cell, however, decreased 2–3-fold between June 1992 and August 1993. No new algal and archaeal blooms developed after the winter floods of 1992–1993, in spite of the fact that salinity values in the surface layer were sufficiently low to support a new algal bloom. A remnant of the 1992 Dunaliella bloom maintained itself at the lower end of the pycnocline at depths between 7 and 13 m (September 1992–August 1993). Its photosynthetic activity was small, and very little stimulation of archaeal growth and activity was associated with this algal community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033627
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  • 5
    Electronic Resource
    Electronic Resource
    Microbiological studies in the Dead Sea: future challenges toward the understanding of life at the limit of salt concentrations (1999)
    Springer
    Hydrobiologia 405 (1999), S. 1-9 
    Details
    ISSN: 1573-5117
    Keywords: Dead Sea ; Dunaliella ; halophilic Archaea ; bacteriorhodopsin ; bacteriophages ; fungi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003879932328
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  • 6
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    Frustration and magnetism of the zigzag chain compounds EuL_{2}O_{4} (L= Yb, Lu, Gd, Eu) (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-08-10
    Description: Author(s): Oren Ofer, Jun Sugiyama, Jess H. Brewer, Eduardo J. Ansaldo, Martin Månsson, Kim H. Chow, Kazuya Kamazawa, Yoshihiro Doi, and Yukio Hinatsu We present muon-spin rotation/relaxation and susceptibility measurements on polycrystalline samples of Eu L 2 O 4 , where L is the lanthanide Yb, Lu, Gd, or Eu. The magnetic phase of these quasi-one-dimensional zigzag chain compounds is characterized with respect to the difference in their lanthanide mag... [Phys. Rev. B 84, 054428] Published Tue Aug 09, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Successive magnetic transitions and static magnetic order in RCoAsO (R=La, Ce, Pr, Nd, Sm, Gd) confirmed by muon-spin rotation and relaxation (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-11-17
    Description: Author(s): Jun Sugiyama, Martin Månsson, Oren Ofer, Kazuya Kamazawa, Masashi Harada, Daniel Andreica, Alex Amato, Jess H. Brewer, Eduardo J. Ansaldo, Hiroto Ohta, Chishiro Michioka, and Kazuyoshi Yoshimura [Phys. Rev. B 84, 184421] Published Wed Nov 16, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Magnetic and diffusive nature of LiFePO_{4} investigated by muon spin rotation and relaxation (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-08-10
    Description: Author(s): Jun Sugiyama, Hiroshi Nozaki, Masashi Harada, Kazuya Kamazawa, Oren Ofer, Martin Månsson, Jess H. Brewer, Eduardo J. Ansaldo, Kim H. Chow, Yutaka Ikedo, Yasuhiro Miyake, Kazuki Ohishi, Isao Watanabe, Genki Kobayashi, and Ryoji Kanno In order to elucidate the magnetism and Li diffusion in LiFePO 4 , we have measured muon-spin rotation and relaxation ( μ + SR) spectra for the polycrystalline LiFePO 4 sample in the temperature range between 1.8 and 500 K. Below T N ∼52 K, two oscillatory signals together with one fast relaxation signal we... [Phys. Rev. B 84, 054430] Published Tue Aug 09, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    β-NMR study of isolated ^{8}Li^{+} in the enhanced paramagnet platinum (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-08-15
    Description: Author(s): Oren Ofer, K. H. Chow, I. Fan, M. Egilmez, T. J. Parolin, M. D. Hossain, J. Jung, Z. Salman, R. F. Kiefl, C. D. P. Levy, G. D. Morris, M. R. Pearson, H. Saadaoui, Q. Song, D. Wang, and W. A. MacFarlane We report β -detected nuclear magnetic resonance ( β -NMR) measurements of 8 Li + implanted into high purity Pt. The frequency of the 8 Li β -NMR resonance and the spin-lattice relaxation rates 1/ T 1 were measured at temperatures ranging from 3 to 300 K. Remarkably, both the spin-lattice relaxation rate and... [Phys. Rev. B 86, 064419] Published Tue Aug 14, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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