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  • Dunaliella  (5)
  • Magnetism  (4)
  • Halophilic  (3)
  • LAUNCH VEHICLES AND SPACE VEHICLES  (3)
  • Collagen
  • Optimal pricing
  • 1
    Electronic Resource
    Electronic Resource
    Reduced levels of α1 (I) collagen mRNA in cells immortalized by mutant p53 or transformed by ras
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 1129 (1991), S. 34-42 
    Details
    ISSN: 0167-4781
    Keywords: Collagen ; Transformation ; Tumor suppressor ; p53 ; ras
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0167-4781(91)90209-5
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Multilevel demand subscription pricing for electric power
    Amsterdam : Elsevier
    Energy Economics 8 (1986), S. 199-217 
    Details
    ISSN: 0140-9883
    Keywords: Demand model ; Electric power ; Optimal pricing
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0140-9883(86)90001-0
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  • 4
    Electronic Resource
    Electronic Resource
    Occurrence of virus-like particles in the Dead Sea (1997)
    Springer
    Extremophiles 1 (1997), S. 143-149 
    Details
    ISSN: 1433-4909
    Keywords: Key words Virus-like particles ; Dead Sea ; Halophilic ; Archaea ; Hypersaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electron-microscopic examination of water samples from the hypersaline Dead Sea showed the presence of high numbers of virus-like particles. Between 0.9 and 7.3 × 107 virus-like particles ml−1 were enumerated in October 1994 in the upper 20 m of the water column during the decline of a bloom of halophilic Archaea. Virus-like particles outnumbered bacteria by a factor of 0.9–9.5 (average 4.4). A variety of viral morphologies were detected, the most often encountered being spindle-shaped, followed by polyhedral and tailed phages. In addition, other types of particles were frequently found, such as unidentified algal scales, and virus-sized star-shaped particles. Water samples collected during 1995 contained low numbers of both bacteria and virus-like particles (1.9–2.6 × 106 and 0.8–4.6 × 107 ml−1 in April 1995), with viral numbers sharply declining afterwards (less than 104 ml−1 in November 1995–January 1996). It is suggested that viruses may play a major role in the decline of halophilic archaeal communities in the Dead Sea, an environment in which protozoa and other predators are absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007920050027
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  • 5
    Electronic Resource
    Electronic Resource
    Ectothiorhodospira marismortui sp. nov., an obligately anaerobic, moderately halophilic purple sulfur bacterium from a hypersaline sulfur spring on the shore of the Dead Sea (1989)
    Springer
    Archives of microbiology 151 (1989), S. 524-529 
    Details
    ISSN: 1432-072X
    Keywords: Ectothiorhodospira marismortui sp. nov. ; Purple sulfur bacteria ; Sulfide ; Photoorganotrophic ; Anaerobic ; Halophilic ; 16S rRNA oligonucleotide catalog
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel type of purple sulfur bacterium was isolated from a hypersaline sulfur spring on the shore of the Dead Sea. The cells of the isolate are irregularly rod-shaped or curved, and motile by means of a tuft of polar flagella. The photosynthetic system, containing bacteriochlorophyll a and carotenoids of the spirilloxanthin series, is located on stacks of lamellar membranes in the cell cytoplasm. The organism can grow either photoautotrophically with sulfide as electron donor, which is oxidized via extracellular sulfur to sulfate, or photoheterotrophically, using acetate, succinate, fumarate, malate or pyruvate as carbon sources. The bacterium is obligately anaerobic, and requires a source of reduced sulfur for growth. The isolate is moderately halophilic, and grows optimally at NaCl concentrations between 3 and 8%, temperatures between 30 and 45°C, and neutral pH. 16S ribosomal RNA oligonucleotide cataloging suggests a close relationship to purple sulfur bacteria of the genus Ectothiorhodospira. As the isolate differs greatly from the described members of the genus Ectothiorhodospira, we describe the isolate as a new species, and propose the name Ectothiorhodospira marismortui sp. nov.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454869
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  • 6
    Electronic Resource
    Electronic Resource
    Intracellular salt and solute concentrations in Ectothiorhodospira marismortui: glycine betaine and Nα-carbamoyl glutamineamide as osmotic solutes (1991)
    Springer
    Archives of microbiology 156 (1991), S. 350-355 
    Details
    ISSN: 1432-072X
    Keywords: Ectothiorhodospira ; Halophilic ; Compatible solutes ; Glycine betaine ; Nα-carbamoyl glutamineamide ; Sucrose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ectothiorhodospira marismortui, a moderately halophilic purple sulfur bacterium from a hypersaline sulfur spring, contains glycine betaine and Nα-carbamoyl glutamineamide (CGA) as the main intracellular osmotic solutes, with sucrose as a minor component. The concentration of glycine betaine was found to increase with increasing salt concentration of the medium, from 0.47 M to 1.29 M in cells grown from 0.85 to 2.56 M NaCl, while the estimated CGA concentration rose from about 0.2 M to 0.5 M. The concentration of sucrose remained constant at a value of around 0.05 M. Intracellular sodium and potassium concentrations were relatively low (around 0.5 and 0.3 M, respectively, at an external NaCl concentration of 1.8 M). The concentration of the novel compound Nα-carbamoyl glutamineamide was enhanced when l-glutamine was added to the growth medium, suggesting that glutamine served as a precursor for the synthesis of the compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248709
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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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