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  • 1
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    Seasonal and Interannual Variability of the Mineral Dust Cycle under Present and Glacial Climate Conditions (2002)
    In:  EPIC3Journal of Geophysical Research, 107, No. D24, 4744 p.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Biotransformation at 10° C of Di-n-Butyl Phthalate in Subsurface Microcosms (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 34 (1996), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Di-n-butyl phthalate (DBP) was found to be transformed by microorganisms under aerobic and anaerobic conditions at 10° C in microcosms simulating the Canadian Forces Base (CFB) Borden subsurface environment. Biotransformation of DBP was observed under aerobic, nitrate-reducing, Fe(III)-reducing, and sulfate-reducing conditions. The biotransformation of DBP in the microcosms was significantly decreased as the redox potential was lowered, especially under sulfate-reducing conditions. However, other factors such as nutrient depletion and buildup of toxic intermediates could have affected the biotransformation rates. The highest DBP biotransformation rate (0.57 μg DBP.g sediment−1.day−1) was observed under aerobic conditions whereas the lowest rate (0.05 μg DBP.g sediment−1.day−1) was under sulfate-reducing conditions. Biotransformation of DBP at 10° C was significantly enhanced by the addition of 10 mM NaNO3 suggesting that both the addition of nitrate and high redox conditions favor its biotransformation in subsurface environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1996.tb02072.x
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  • 3
    Electronic Resource
    Electronic Resource
    Biotransformation of Benzene by Denitrification in Aquifer Sand (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 26 (1988), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This study investigated the biodegradation of benzene, toluene, and the isomers of xylene (BTX) in anaerobic batch microcosms containing shallow aquifer material. BTX loss occurred with the addition of either nitrate or oxygen. Denitrification was confirmed by nitrous oxide accumulation after acetylene blockage of nitrate reductase. When a limiting amount of nitrate was added, there was a corresponding limit to the loss of BTX and a limited amount of nitrous oxide production. We propose that the addition of nitrate to gasoline-contaminated aquifers would serve as an adjunct to current remedial techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1988.tb00362.x
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  • 4
    Electronic Resource
    Electronic Resource
    Climate and CO2 controls on global vegetation distribution at the last glacial maximum: analysis based on palaeovegetation data, biome modelling and palaeoclimate simulations (2003)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 9 (2003), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The global vegetation response to climate and atmospheric CO2 changes between the last glacial maximum and recent times is examined using an equilibrium vegetation model (BIOME4), driven by output from 17 climate simulations from the Palaeoclimate Modelling Intercomparison Project. Features common to all of the simulations include expansion of treeless vegetation in high northern latitudes; southward displacement and fragmentation of boreal and temperate forests; and expansion of drought-tolerant biomes in the tropics. These features are broadly consistent with pollen-based reconstructions of vegetation distribution at the last glacial maximum. Glacial vegetation in high latitudes reflects cold and dry conditions due to the low CO2 concentration and the presence of large continental ice sheets. The extent of drought-tolerant vegetation in tropical and subtropical latitudes reflects a generally drier low-latitude climate. Comparisons of the observations with BIOME4 simulations, with and without consideration of the direct physiological effect of CO2 concentration on C3 photosynthesis, suggest an important additional role of low CO2 concentration in restricting the extent of forests, especially in the tropics. Global forest cover was overestimated by all models when climate change alone was used to drive BIOME4, and estimated more accurately when physiological effects of CO2 concentration were included. This result suggests that both CO2 effects and climate effects were important in determining glacial-interglacial changes in vegetation. More realistic simulations of glacial vegetation and climate will need to take into account the feedback effects of these structural and physiological changes on the climate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2486.2003.00640.x
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  • 5
    Electronic Resource
    Electronic Resource
    α -Adrenergic receptors modulate β -receptor affinity in rat kidney membranes (1980)
    [s.l.] : Nature Publishing Group
    Nature 286 (1980), S. 159-160 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adult Sprague-Dawley rats were killed by cervical dislocation. Kidneys were removed immediately and homogenized in 0.25 M sucrose in buffer (50 mM Tris-HCl, pH 8.1, 10mMMgSO4). The homogenate was centrifuged twice at 2,000g for 5 min and the final supernatant was centrifuged at 30,000g for 15 min. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/286159a0
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  • 6
    Electronic Resource
    Electronic Resource
    Neanderthal DNA Not just old but old and cold? (2001)
    [s.l.] : Nature Publishing Group
    Nature 410 (2001), S. 771-772 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The successful retrieval of ancient DNA from two geographically dispersed Neanderthal skeletons has fuelled a demand for more Neanderthal DNA sequences for analysis. However, these exceptionally well-preserved specimens were geologically young and the mean annual temperature of their cave sites ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35071177
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  • 7
    Electronic Resource
    Electronic Resource
    Correlated morphological and functional study of isolated rat thyroid follicles in suspension culture
    Amsterdam : Elsevier
    Molecular and Cellular Endocrinology 71 (1990), S. 141-153 
    Details
    ISSN: 0303-7207
    Keywords: (Rat) ; Culture ; Thyroglobulin iodination ; Thyroid follicle
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0303-7207(90)90251-3
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  • 8
    Electronic Resource
    Electronic Resource
    Development of an optimal heterotrophic growth medium for Chlorella vulgaris (1984)
    Springer
    Applied microbiology and biotechnology 20 (1984), S. 281-283 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Final biomass yields of Chlorella vulgaris cultured heterotrophically in bristol medium amended with 0.1% (w/v) yeast extract (Difco) or 0.5% glucose (w/v) were 26 and 58 times higher, respectively, than yields obtained for autotrophically grown cells in the light. Similarly, final biomass increases were 35 and 138 fold for these organic substrates in the dark. The mixture of 0.1% yeast extract and 0.5% glucose was optimal and produced increases in final biomass of 70 and 140 times in the light and dark, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250641
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  • 9
    Electronic Resource
    Electronic Resource
    Detection and analysis of interactions between atrazine and sodium pentachlorophenate with single and multiple algal-bacterial populations (1985)
    Springer
    Archives of environmental contamination and toxicology 14 (1985), S. 167-177 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract A multispecies-multitoxicant defined microcosm was studied by examination of its various components. Determination of population interactions showed thatChlorella vulgaris inhibitedAnkistrodesmus braunii by 32%. The presence ofChromobacterium violaceum resulted in a further inhibition ofA. braunii (17%) but its presence had no effect onC. vulgaris. Sensitivity of the two algae and the bacterium were determined for the toxicants atrazine1 and sodium pentachlorophenate, both singly and in combination. While both algae were sensitive to the toxicants, the combined effect of the toxicants on the individual populations was additive. In mixed cultures with one toxicant present, a synergistic interaction was detected between sodium pentachlorophenate andC. vulgaris with respect to A.braunii. Further, the combination ofA. braunii and atrazine withC. vulgaris resulted in an increased inhibition ofC. vulgaris. These observations indicate that biological-chemical interactions can occur as do population-population and chemical-chemical interactions. When mixed cultures of the algae were treated with both toxicants, chemical antagonism was observed. This antagonism was modified by the presence of the bacterium but it was not eliminated. It was concluded that the techniques allowed determination of the interactions in a complex microcosm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055608
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  • 10
    Electronic Resource
    Electronic Resource
    Are adrenergic neurons subject to a serotoninergic influence in the nucleus tractus solitarii? (1989)
    Springer
    Cell & tissue research 258 (1989), S. 603-610 
    Details
    ISSN: 1432-0878
    Keywords: Serotonin ; Adrenaline ; Neuronal interactions ; Nucleus tractus solitarii ; C2 area ; Rat (Sprague-Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The possible relationships between adrenaline-synthesizing neurons and serotoninergic afferent fibers in the nucleus tractus solitarii of the rat were investigated both morphologically and biochemically. Adrenergic elements (cell bodies, dendrites and nerve endings) were detected simultaneously with serotoninergic axonal varicosities in the same electron-microscopic sections by means of combined phenylethanolamine-N-methyltransferase immunocytochemistry and [3H]serotonin-uptake radioautography. Among some 500 serotoninergic varicosities scanned in the areas of significant overlap between the 2 types of labeling, only 3 were directly apposed to an adrenergic process, identified as a dendrite in each case. No synaptic membrane differentiations were seen at these occasional sites of contact. Destruction of the serotonin input by 5,7-dihydroxytryptamine had no significant effect on the tyrosine hydroxylase, dopamine-β-hydroxylase and phenylethanolamine-N-methyltransferase enzymatic activities in the C2 adrenergic region, but induced 22% and 38% increases of tyrosine hydroxylase and dopamine-β-hydroxylase activities, respectively, in the neighboring A2 noradrenergic area. Taken together, these results suggest that serotoninergic and adrenergic neurons do not significantly interact in the nucleus tractus solitarii; this implies that the possible catecholaminergic relays for the action of serotonin in autonomic regulation at this level could consist of noradrenergic neurons rather than of their adrenergic counterparts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218873
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