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  • 1
    Electronic Resource
    Electronic Resource
    The visible photoabsorption spectrum of Ar+3 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 71-74 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation cross section of Ar+3 was measured at a number of wavelengths between 1064 and 320 nm. A single broad and featureless band was observed peaking near 520 nm with a width of (approximate)2600 cm−1 and a peak cross section of (approximate)10−16 cm2. Consideration of the electronic structure of Ar+3 indicates that the measured spectrum is equivalent to the photoabsorption spectrum. Two ionic products, Ar+ and Ar+2, were observed in the photodissociation of Ar+3, indicative of at least two exit pathways and suggestive of two electronic transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455462
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  • 2
    Electronic Resource
    Electronic Resource
    ENDOR Studies of the Primary Donor Cation Radical in Mutant Reaction Centers of Rhodobacter sphaeroides with Altered Hydrogen-Bond Interactions (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 8130-8143 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00025a020
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  • 3
    Electronic Resource
    Electronic Resource
    Electronically excited states in size selected solvated alkali metal atoms. I. First observation in NaNH3 by resonant two color two photon ionization (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6559-6564 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonant two color two photon ionization is used to investigate the first electronically excited state of NaNH3 as a first example of size selected, solvated alkali metal atoms systems (alkali⋅solventn). The observed spectrum shows a complex vibrational and rotational structure. The 0-0 transition is found at 12 220 cm−1 (1.52 eV), in good agreement with recent theoretical calculations. With increasing laser power ionic fragments of the molecule are seen, indicating possible new avenues to study the dynamics of charge transfer processes in this type of model system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468349
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  • 4
    Electronic Resource
    Electronic Resource
    Autodetachment dynamics of acetaldehyde enolate anion, CH2CHO- (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 10281-10286 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100142a005
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  • 5
    Electronic Resource
    Electronic Resource
    Spin fluctuations of paramagnetic iron centers in proteins and model complexes: Mössbauer and EPR results (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5077-5091 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have analyzed the Mössbauer spectra of several iron proteins in the regime of intermediate fluctuation rates of the magnetic hyperfine interaction using the dynamic line shape model of Clauser and Blume. All Mössbauer data were recorded in applied fields so that the electron Zeeman interaction is much larger than the hyperfine splittings. We modeled the transitions between the eigenstates of the electronic spin Hamiltonian by an effective spin–phonon coupling V(1)=V0∑′i,j=x,y,zSi Sj and described the phonons in the Debye approximation. With V0 as the only adjustable parameter the model reproduced the major temperature dependence of the spectral shapes for spins from S=1 to S=5/2. We found V0 to lie in the narrow range 3 K ≤V0/k≤19 K, which is of the order of the zero-field splittings, but does not correlate with it. The smallest values of V0 were observed in the four-coordinate iron–sulfur proteins. Refinements and implications of the model are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453675
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  • 6
    Electronic Resource
    Electronic Resource
    Moessbauer and electron paramagnetic resonance studies of horseradish peroxidase and its catalytic intermediates (1984)
    s.l. : American Chemical Society
    Biochemistry 23 (1984), S. 4743-4754 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00315a033
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  • 7
    Electronic Resource
    Electronic Resource
    Scattering experiments with sodium clusters: Differential cross sections and classical trajectory calculations (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9635-9649 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Scattering of sodium clusters Nan (n =3,8) with argon, neon and molecular nitrogen is investigated in a crossed molecular beam experiment. The clusters are scattered by a pulsed gas beam and subsequently ionized by a pulsed laser and detected in a time-of-flight mass spectrometer. Total differential cross sections for Nan+ Ar, Ne and N2 (n=3−8) are measured. The angularly resolved cross sections show a significant amount of energy transfer to the clusters in the collision process. Classical trajectory calculations are performed using an distance-dependant Hückel-type Hamiltonian with added pair potentials for the sodium–rare gas interaction. The results show good agreement with the measurements in the range of small impact parameters. It is observed that the different isomers of the clusters play an important role in the process. Discrete excitations are analyzed for Na3 and Na5. The shape of the measured angular distributions is explained from the superposition of rotational rainbows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464394
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  • 8
    Electronic Resource
    Electronic Resource
    Differences in LPS-Induced Activation of Bronchial Epithelial Cells (BEAS-2B) and Type II-Like Pneumocytes (A-549) (2002)
    Oxford, UK : Blackwell Science Ltd
    Scandinavian journal of immunology 56 (2002), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Lipopolysaccharide (LPS) as a major component of the outer membrane of gram-negative bacteria stimulates various cells to initiate a signalling cascade which ultimately leads to cell activation and expression of immunoregulatory or inflammatory cytokines. The human respiratory epithelium is an important environmental interface, but differences in LPS-induced cell activation between bronchial and alveolar epithelial cells have not yet been investigated in detail. First, the expression of Toll-like receptors (TLRs), as pattern-recognition receptors, was investigated for the bronchial epithelial cells and type II-like pneumocytes, demonstrating that they fulfil the prerequisites for LPS signalling. Thereafter, the effects of LPS, soluble CD14 (sCD14) and LPS-binding protein (LBP) on the release of interleukin-6 (IL-6) and IL-8 were studied. In the presence of LPS, sCD14 induced a significant and concentration-dependent cytokine release in type II-like pneumocytes, whereas the response of bronchial epithelial cells to sCD14 stimulation was low, implicating sCD14-independent activation mechanisms. Furthermore, LBP revealed inhibitory effects on the activation of alveolar epithelial cells, which may represent a novel local defence mechanism during gram-negative infection. We conclude that distinct pathways exist for LPS-induced activation of bronchial and alveolar epithelial cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3083.2002.01137.x
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  • 9
    Electronic Resource
    Electronic Resource
    Constructed wetlands with free water surface for treatment of aquaculture effluents (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 20 (2004), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The aim of the study was to determine the reduction of the overall environmental load (in terms of organic and nutrient load) in effluents of a flow-through trout farm. Effluents of a flow-through system for rainbow trout (Oncorhynchus mykiss) production passed through constructed wetlands with free water surface. Removal of nutrients was determined in three wetlands of 350 m2 each at hydraulic residence times (HRTs) of 3.5, 5.5 and 11 h. The areal load of total suspended solids (TSS), chemical oxygen demand (COD), total phosphorus (TP), and total nitrogen (TN) varied in terms of HRTs from 12.3–36.8 g m−2 day−1, 21.7–65.2 g m−2 day−1, 0.23–0.70 g m−2 day−1, and 1.46–4.37 g m−2 day−1. Values for reduction of suspended solids, COD, TP, and TN were 67–72%, 30–31%, 41–53% ,and 19–30%, respectively. Significantly lower nutrient concentrations in the effluent among the wetlands were only found for nitrogen parameters: TN and ammonia concentrations were lower in the wetlands with a HRT of 5.5 h (0.89 mg L−1, 0.11 mg L−1) and 11 h (0.81 mg L−1, 0.11 mg L−1) compared with the one with 3.5 h (0.96 mg L−1, 0.16 mg L−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0175-8659.2003.00520.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of feeding under-year zander (Sander lucioperca) on size, body mass and body composition before and after wintering (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zander (Sander lucioperca) is one of the most important fish species in the German inland fishery. As a pelagic predator, zander is able to regulate populations of small cyprinids and perch and is therefore used in ‘top-down’ projects to directly control the food web. At present, natural waters are mainly stocked with one-summer-old zander from pond hatcheries; however, such fish are poor stocking material due to low survival rates, presumably because of their small size. Two groups of 50-day-old zander fingerlings reared in a recirculation system (T = 23 °C) were used. For 90 days one group (FG 1) was fed with a commercial dry feed (Trouvit Pro Aqua Brut), and the other group (FG 2) was fed with chironomides (Chironomus spp.). The fat content of the dry feed was increased with fish oil supplemented up to 22%. After the rearing period the FG 1 fishes attained the largest size and fat content. A pond with a surface of 667 m2 and a mean depth of 0.8 m was stocked with 24-tagged zander (12 of each feeding group) for wintering. After the winter period of 176 days, survival rate of each feeding group was 83.3%. The fatty acid composition in the membrane lipids of group 2 changed dramatically. In contrast to previous investigations, presented results indicate that the survival rate is not influenced by fish size (weight and length). The crucial factors for high survival rates of zander during wintering are the crude tissue fat content (〉5%) and its fatty acid composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00665.x
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