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  • 1
    Electronic Resource
    Electronic Resource
    The rate of microbial degradation of oil in a beach gravel column (1976)
    Springer
    Microbial ecology 3 (1976), S. 55-64 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An automatic, continuous flow respirometer was used to follow the bio-oxidation of a crude oil in a column of fairly coarse beach material. A number of water percolation rates were employed, with and without inorganic nutrient supplementation (nitrate and phosphate). Initially, nutrient supplementation was required to allow significant oxidation rates, but a capacity for biodegradation in the absence of continued supplementation developed slowly. The increase in oxidation rate with nutrient supplementation was in the proportion 0.23 mg oxygen perμmol nitrate. This proportionality was similar to previous results in this laboratory (using different systems), as was the effect of temperature. The mean of two Q10 values in this work was 2.7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02011453
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  • 2
    Electronic Resource
    Electronic Resource
    Characterisation of the low affinity interaction between rat cell adhesion molecules CD2 and CD48 by analytical ultracentrifugation (1997)
    Springer
    European biophysics journal 25 (1997), S. 455-462 
    Details
    ISSN: 1432-1017
    Keywords: Key words T-lymphocytes ; Dissociation constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract CD2 is a cell adhesion molecule found on the plasma membrane of T-lymphocytes. Its counter-receptor in rat is the structurally related CD48. This interaction is believed to contribute to the adhesion of T-cells to other cells such as cytotoxic targets and antigen presenting cells. Cell-cell adhesion involves the formation of multiple cell adhesion molecule complexes at the cell surface and if cell-cell de-adhesion is to occur, these complexes need to be disrupted. The affinities of cell adhesion molecule interactions are suggested to be relatively weak to allow this de-adhesion of cell-cell interactions. The CD2/CD48 interaction has been studied using recombinant extracellular proteins and the affinity of the interaction of soluble recombinant rat CD2–CD48 has been determined (at 37°C) using surface plasmon resonance (and shown to be weak), with the dissociation constant Kd=60–90 µm. The values determined by surface plasmon resonance results could be affected by the immobilisation of the ligand on the chip and any self-association on the chip. We used three different analytical ultracentrifuge procedures which each allowed the interaction to be studied in free solution without the need for an immobilisation medium. Both sedimentation equilibrium (using direct analysis of the concentration distribution and also modelling of molecular weight versus concentration data) and sedimentation velocity at 5°C yielded dissociation constants in the range of 20– 110 µm, supporting the surface plasmon resonance findings showing that binding between these cell adhesion molecules is relatively weak. These studies also ruled out the presence of any significant self-association of the reactants which could lead to systematic error in the surface plasmon resonance results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050060
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  • 3
    Electronic Resource
    Electronic Resource
    Rotational energy transfer in excited states of halogen molecules. I. Transfer from v'=6, J'=72 in IF B 3Π(0+) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1661-1671 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A cw laser-induced fluorescence experiment is described in which state-to-state rate coefficients for rotation-to-translation energy transfer have been determined from J'=72, v'=6 in IF B 3Π(0+). Using the collision partners He, Ne, Ar, Kr, Xe, N2, and CF4, nearly 500 individual rate coefficients have been measured. The rare-gas atoms display a characteristic behavior with the heavier collision partners more efficiently exchanging large amounts of angular momentum in a single collision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458047
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  • 4
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of tellurium with fluorine: The A 2Πi–X 2Πi and B 2Σ+–X2Πi transitions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5007-5012 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Te reacts with fluorine to give a strong chemiluminescence between 3800 and 8700 A(ring). The emission spectrum contains both 2Σ+–2Πi and 2Πi–2Πi systems. TeF emission bands are of the Hund's type (a) without spin forbidden intermultiplet crossing. Spin orbit coupling of the X 2Πi state is −497 cm−1 as determined from the 2Σ+–2Πi transition. Vibrational constants are reported for all states and compare favorably with those obtained from theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449766
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  • 5
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of selenium with fluorine: Assignment of the SeF A 2Π3/2 state (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4544-4553 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Selenium reacts with fluorine with a weak visible chemiluminescence between 3800 and 8900 A(ring). Identical spectra are obtained regardless of whether the source of selenium is the elemental vapor or hydrogen selenide. By analogy with C10, TeF, and reevaluated SF absorption data, the SeF band system is assigned to transitions between inverted 2Π states. The spectroscopic constants for the A 2Π3/2 to X 2Π3/2 system are: Te=14 680.4 cm−1, ω‘e =688.8 cm−1, ωex‘e =1.84 cm−1, ω'e =444.1 cm−1, and ωexe =2.93 cm−1. The weak 2Π1/2 to 2Π1/2 subband is described by the constants: Te =15 025.4 cm−1, ω‘e =683.0 cm−1, ωex‘e =2.11 cm−1, ω'e =436.9 cm−1, and ωexe =1.20 cm−1. Laser excitation spectra were recorded for the SeF chemiluminescence flame. The SeF fluorescence between 4200 and 5200 A(ring) is rapidly quenched with increasing total pressure. A Stern–Volmer analysis gave a zero pressure lifetime of 12.8±3.9 μs. The measured quenching rate of 2.5×106 s−1 Torr−1 is nearly gas kinetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449024
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  • 6
    Electronic Resource
    Electronic Resource
    Excitation of iodine fluoride(B3.PI.(0+)) by metastable oxygen. 1. Studies involving iodine fluoride (X,v) (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 4610-4618 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100165a008
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  • 7
    Electronic Resource
    Electronic Resource
    Detection of vibrationally excited molecular iodine in the dissociation region of chemical oxygen-iodine lasers (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 902-905 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100277a038
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  • 8
    Electronic Resource
    Electronic Resource
    Multilevel amplified spontaneous emission in I2 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2672-2677 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of a study of amplified spontaneous emission (ASE) in the I2(B→X) system. For many (v',v‘) bands, several J'→J‘ transitions contribute to the ASE in a cooperative manner. We present spectroscopic and kinetic data that contrast this cooperative stimulated emission to the emission in previously reported optically pumped lasers. Transitions that involve several cooperatively emitting levels produce efficient conversion of the pump laser to near-infrared output.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353063
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  • 9
    Electronic Resource
    Electronic Resource
    Optical gain on the I2 (B3Πo+→X3Σg+) system produced by a visible wavelength diode laser (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 621-625 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of a measurement of subdoppler gain profiles in molecular iodine produced by a low power tunable diode laser. Using a sensitive, two beam detection method, we have measured absorptions and amplifications that are only a few parts in 104. Amplification was observed for pump laser powers of only 200 μW, and the optical gain observed varied linearly with pump power. Comparisons with a simple, steady-state model are also discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373712
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  • 10
    Electronic Resource
    Electronic Resource
    Multilevel cooperative amplified spontaneous emission from the I2(B→X) system (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 5-10 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amplified spontaneous emission (ASE) on the I2(B→X) system has been studied as a function of excitation wavelength by using a narrow-band pulsed dye-laser pump source. ASE output in the range 1.1–1.3 μm has been observed for dye-laser excitation wavelengths between 515 and 600 nm. Cooperative emission from several adjacent rotational levels has been observed and provides an explanation for anomalous spectral features. The conversion efficiency of dye-laser photons to ASE output was as high as a few percent. Pump energy thresholds as low as 5.0 μJ were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339161
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