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  • 2005-2009  (2)
  • 1990-1994  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Inversion of experimental data to generate state-to-state cross sections for rovibrationally inelastic scattering of CO2 by hot hydrogen atoms (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 347-357 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: State-to-state integral cross sections for rovibrationally inelastic collisions between CO2 and hot hydrogen atoms are obtained by inversion of rotationally resolved population measurements of CO2 (0001). The inversion/fitting procedure is based upon the infinite order sudden (IOS) scaling law and employs a spline interpolating model to reduce the amount of information to be extracted. The experimental data used in the analysis was obtained using time domain tunable diode laser absorption spectroscopy to measure rotationally resolved excitation in CO2 (0001) following the generation of translationally hot H atoms via H2S photolysis at 193 nm. The analysis utilizes data acquired at two temperatures, 292 and 223 K, in order to acquire additional information about the temperature independent scattering cross sections. Sensitivity analysis is employed to gauge the sensitivity of the extracted cross sections to uncertainties in the experimental data, and also to estimate the effect of additional measurements at different temperatures. The final extracted cross sections exhibit strong rotational inelasticity, with a propensity for scattering from 0000; J' to both 0001; J=J' and 0001; J=||J'±41||. The largest state-to-state collision cross section corresponds to the (0000; J'=0) to (0001; J=41) transition and has a magnitude of (2.0±0.4)×10−3 A(ring)2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458436
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    State-resolved vibrational, rotational, and translational energy deposition in CO2(0001) excited by collisions with hot hydrogen atoms (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4876-4886 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time-domain tunable diode laser absorption spectroscopy has been used to measure rotationally resolved transient absorption line shapes and nascent rotational populations for CO2 molecules excited into the (0001) vibrational state by collisions with translationally hot hydrogen atoms. High-accuracy measurements were made at both 292 and 223 K, providing information about the initial-state dependence of the collision dynamics and about the (temperature-independent) state–to–state scattering cross sections. The nascent rotational population distribution is found to be nearly independent of temperature, indicating broad rotational inelasticity in the 0000→0001 scattering process. The nascent populations and transient linewidths are interpreted in terms of two separate theoretical models which lend substantial insight into the H–CO2 collision dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457704
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Collisional excitation of CO2(0111) by hot hydrogen atoms: Alternating intensities in state-resolved vibrational, rotational, and translational energy transfer (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 445-451 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time domain tunable diode laser absorption spectroscopy has been used to measure rotationally resolved transient absorption line shapes and nascent rotational populations for CO2 molecules excited into the (0111) vibrational state by collisions with translationally hot hydrogen atoms. The even rotational levels are more heavily populated than the odd levels, in agreement with propensity rules derived earlier by Alexander and Clary. The nascent populations and transient linewidths are interpreted in terms of a theoretical model that lends insight into the H–CO2 collision dynamics. The cross section for exciting (0111) is ∼0.23 times the cross section for exciting (0001), and ∼0.38 times the cross section for exciting (1000).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459718
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nutrition influences growth and virulence of the insect-pathogenic fungus Metarhizium anisopliae (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 251 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Nutrition influenced growth, sporulation and virulence of the insect pathogenic fungus, Metarhizium anisopliae. Virulent conidia were produced on susceptible insect hosts, 1% yeast extract, 2% peptone, osmotic stress medium (OSM) and CN 10:1 medium. Several strain independent markers were identified that could be used to predict the virulence of M. anisopliae conidia. Virulent conidia typically had high levels of spore bound Pr1, an important cuticle degrading protease, and high germination rates. We also show for the first time that virulent conidia have an endogenous CN ratio below 5.2:1. Real Time PCR revealed that virulent conidia from insects contained significantly higher levels of transcripts of pr1 A and other pathogenicity-related genes than inoculum from artificial media. Of the artificial media studied, 1% yeast extract medium yielded the most virulent conidia, these had higher levels of transcripts of these pathogenicity-related genes than the least virulent conidia from the high conidia yielding CN 35:1 medium (= SDA), however, the levels were significantly lower than those in insect-derived conidia. Our study shows for the first time that the passaged inoculum is virulent irrespective of the original culture medium or insect host. Virulent conidia were consistently produced on OSM even though growth and sporulation were poor. We postulate that starvation conditions, whether in vivo or in vitro, results in de-repression of Pr1 and that elevated levels of this enzyme enhance fungal virulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2005.08.010
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of nutrition on the production and physiology of sectors produced by the insect pathogenic fungus Metarhizium anisopliae (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 250 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Metarhizium anisopliae strains V245 and V275 differed in their stability when grown on different nutrient media. V275 produced fewer sectors than V245 irrespective of the cultural conditions. Both strains produced more sectors on nutrient rich media. At least four distinct types of sectors were produced in vitro. Most sectors were sterile or sporulated poorly and produced significantly lower quantities of virulence determining enzymes like Pr1. Real-time PCR confirmed differential expression of the pathogenicity-related genes pr1 A, ste 1, try 1, and chy 1 encoding for the subtilisin Pr1A, esterase, trypsin and chymotrypsin, respectively. API-ZYM revealed that the enzyme profiles of sectors differed from those of the parent cultures and also from other sectors. Sectors of M. anisopliae also produced less destruxins than the parent cultures independent of the strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2005.07.011
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    State-Specific Reactions of Fe+(a6D,a4F) with D2O and Reactions of FeO+ with D2 (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 6522-6529 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100077a017
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Translationally and rotationally resolved excitation of CO2(0002) by collisions with hot hydrogen atoms (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 6183-6189 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time domain tunable diode laser absorption spectroscopy has been used to measure rotationally resolved transient absorption line shapes and nascent rotational populations for CO2 molecules excited into the (0002) vibrational state by collisions with translationally hot hydrogen atoms. The 0002 rotational population distribution and rotationally resolved linewidths are remarkably similar to those previously obtained for 0001. Within the context of a simple physical model used to interpret the data, the similar rotational distributions and translational recoils for 0001 and 0002 suggest that these two states are excited by similar collision trajectories, wherein asymmetric stretching excitation is optimized when H strikes near the end of the O–C–O molecule. The magnitude of population scattered into 0002 is ∼21 times smaller than that scattered into 0001.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464833
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  • 8
    Electronic Resource
    Electronic Resource
    Sequential bond energies of chromium carbonyls (Cr(CO)x+, x = 1-6) (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 7978-7987 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100132a029
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    Paper (German National Licenses)
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