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  • 1
    Electronic Resource
    Electronic Resource
    Studies of the photoionization cross sections of CH4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2998-3001 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present cross sections and asymmetry parameters for photoionization of the 1t2 orbital of CH4 using static-exchange continuum orbitals of CH+4 to represent the photoelectron wave function. The calculations are done in the fixed-nuclei approximation at a single internuclear geometry. To approximate the near-threshold behavior of these cross sections, we assumed that the photoelectron spectrum is a composite of three electronic bands associated with the Jahn–Teller components of the distorted ion. The resulting cross sections reproduce the sharp rise seen at threshold in the experimental data and are in good agreement with experiment at higher energy. The agreement between the calculated and measured photoelectron asymmetry parameters is, however, less satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455006
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  • 2
    Electronic Resource
    Electronic Resource
    Cross sections and photoelectron asymmetry parameters for photoionization of H2O (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2362-2366 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The iterative Schwinger variational method is used to obtain cross sections and photoelectron asymmetry parameters for photoionization of the three outermost valence orbitals (1b1, 3a1, and 1b2) of H2O for photon energies from near threshold to 50 eV. A comparison of these calculated results with available experimental data is encouraging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457977
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  • 3
    Electronic Resource
    Electronic Resource
    Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of H2O via the C 1B1 Rydberg state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3905-3913 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper, we extend a previous formulation of molecular resonance enhanced multiphoton ionization (REMPI) photoelectron spectra of diatomic molecules to treat rotationally resolved photoionization of nonlinear polyatomic molecules. Useful parity selection rules, which govern changes of angular momenta ΔKa and ΔKc, are also derived. As an example, we use this formulation to study rotational branching ratios and photoelectron angular distributions resulting from (3+1') REMPI of H2O via the C 1B1 (3pa1) Rydberg state. Cooper minima are predicted to occur in the d wave (l=2) of the ka1 (λ=0) and kb1 (λ=1) photoelectron continua. The effects of these Cooper minima on rotationally resolved photoelectron spectra are also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462929
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  • 4
    Electronic Resource
    Electronic Resource
    Eregoyazin and eregoyazidin, two new guaianolides from Eremanthus goyazensis (1977)
    s.l. : American Chemical Society
    The @journal of organic chemistry 42 (1977), S. 3910-3913 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00444a025
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  • 5
    Electronic Resource
    Electronic Resource
    Photoionization cross sections and asymmetry parameters for silane (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7228-7232 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present calculated results of photoionization cross sections and photoelectron angular distributions for ionization out of the two outermost 2t2 and 3a1 valence orbitals of silane for photon energies ranging from near threshold to 50 eV. The iterative Schwinger variational method in the exact static-exchange level is applied to obtain the continuum photoelectron orbitals. A generally good agreement is observed between our calculated cross sections and the experimental data available in the literature. In addition, a striking similarity has been observed between the photoionization properties of the 1t2 orbital of methane and the 2t2 orbital of silane. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478626
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  • 6
    Electronic Resource
    Electronic Resource
    Allergenic crossreactivity between Lepidoglyphus destructor and Blomia tropicalis (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 27 (1997), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background In general, the non-pyroglyphid mites Lepidoglyphus destructor and Blomia tropicalis show a different geographical distribution. Allergic sensitization to both species have been demonstrated in several investigations. However, whether this reflects crossreactivity or dual sensitization is so far not known.Objective The aim of the study was to investigate the allergenicity and allergenic crossreactivity of L destructor and B. tropicalis using sera from Sweden and Brazil.Objective Allergens in extracts of L. destructor and B. tropicalis were identified with SDS-PAGE and immunoblotting and the crossreactivity was studied by an immunoblot inhibition method. In addition to mite extracts, a recombinant major allergen of L destructor, Lep d 2, was used.Results The extract prepared from L. destructor contained 21 IgE-binding components when using the Swedish or the Brazilian sera. A 15 kDa allergen was recognized by 85% of the Swedish sera and 78% of the Brazilian. The B. tropicalis extract exposed 23 IgE-binding components when the Brazilian sera were used and 19 when the Swedish sera were used. A total of 83% of the Brazilian sera and 80% of the Swedish sera identified a 14.5 kDa allergen. The IgE response of the Swedish serum pool to 10 B. tropicalis allergens was inhibited by L. destructor extract. Likewise, the response of the Brazilian serum pool to four different L. destructor allergens was inhibited by B. tropicalis extract. The recombinant Lep d 2 allergen inhibited 33% of the IgE binding of the Swedish serum pool to the 14.5 kDa allergen in the B. tropicalis extract.Conclusion crossreactivity with several proteins from L. destructor and B. tropicalis was demonstrated. The results suggest that a B. tropicalis 14.5 kDa allergen is antigenically crossreactive with recombinant L. destructor allergen Lep d 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1997.tb01198.x
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  • 7
    Electronic Resource
    Electronic Resource
    First record of Polyprion oxygeneios(Perciformes: Polyprionidae) for the south-west Atlantic and a northernmost range extension (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 64 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The occurrence of Polyprion oxygeneios(Perciformes: Polyprionidae) is recorded for the first in the south-west Atlantic. Twenty specimens were caught off Rio Grande do Sul (33°41·8′–34° 15·3′ S, 370–854 m depth) during winter cruises of the commercial fishing fleet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00396.x
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of clinical significance and allergenic cross-reactivity of storage mites Blomia kulagini and Lepidoglyphus destructor in Sweden and Brazil (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 45 (1990), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Comparison of the clinical significance and allergenic cross-reactivity of Blomia kulagini(B. kulagini) and Lepidoglyphus destructor (L. destructor) was made on sera from Sweden and Brazil using the radio-allergo-sorbent test (RAST) and the RAST inhibition technique. RAST-positive sera were obtained from 53 allergic Swedish farmers and 31 allergic subjects from Brazil who were positive to B. kulagini and/or L. destructor. B. kulagini was shown to be a common cause of sensitization especially in Brazil. There was a fairly high correlation between positive RAST results to L. destructor and B. kulagini based on sera from both Sweden and Brazil. The highest RAST scores were found against L. destructor in Swedish sera and against B. kulagini in Brazilian sera. The RAST inhibition studies showed that the L. destructor extract was able to inhibit the B. kulagini system (a positive RAST to B. kulagini allergen disc) in Swedish but not in Brazilian sera. In contrast, the B. kulagini extract was only able to inhibit the L. destructor system in sera from Brazil and not in sera from Sweden. This study shows that results obtained with RAST inhibition are not entirely dependent on the overall specificity of the IgE antibodies in the patient's sera, since the more subtle specificity of the primarily sensitizing allergen will dominate. Thus, conclusions drawn regarding allergenic cross-reactivity are dependent on the populations tested, and conclusions on the existence or absence of cross-reactivity, e.g. between two species of mites may be contradictory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1990.tb01091.x
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  • 9
    Electronic Resource
    Electronic Resource
    Increased Bronchial Hypersensitivity after Early and Late Bronchial Reactions Provoked by Allergen Inhalation (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 40 (1985), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The non-specific bronchial reactivity following bronchial allergen challenge was studied in 40 patients with allergic bronchial asthma, particularly in subjects without definite late reactions 6 h after the provocations (reduction in peak expiratory flow or forced expiratory volume in 1 s of less than 15% of the control value at this time). Among a group of 21 patients submitted to bronchial provocation tests, 13 carried out maximal exercise tests 6 h and 1 week after the allergen challenge. In another group of 19 patients, the bronchial hyperreactivity to methacholine was assessed before and 6 h and 1 week after challenge. Two patients with a dual response (early + late) reacted with bronchial obstruction to the exercise. Exercise tests performed after 1 week did not provoke asthma in any patient. In the methacholine group a marked increase in responsiveness to methacholine 6 h after the provocation was observed in those patients with a dual response who were tested and in those with equivocal late reactions and even in three patients with an isolated immediate reaction. The increased responsiveness was still present in many patients 1 week after challenge. The airway caliber did not influence the degree of responsiveness to methacholine. Nor did the degree of responsiveness have any influence on the patterns of reactions observed after allergen exposure.It was concluded that in some individuals exposure to the relevant allergen predisposes them to exercise-inducible bronchial obstruction. Further, it was confirmed that nonspecific bronchial reactivity can be increased not only in patients with late responses - both definite and equivocal - but also in some patients with immediate reactions alone. It is suggested that only allergens provoking late reactions or an increase in the non-specific reactivity should be considered clinically relevant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1985.tb00886.x
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  • 10
    Electronic Resource
    Electronic Resource
    Factors influencing the occurrence of late bronchial reactions after allergen challenge (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 45 (1990), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Forty-seven patients with allergic bronchial asthma were challenged with the relevant allergen. Forty-eight per cent of the provocations resulted in a positive immediate reaction followed by a late bronchial response. Late bronchial obstruction was more common among patients with a high than with a low RAST score. Ten patients were challenged with different allergens on two different occasions, but the same type of bronchial response was observed in only six of them. Nine patients with an isolated immediate response were rechallenged with higher allergen doses, the early bronchial response being partially counteracted by terbutaline inhalations in clinically appropriate doses before and during the inhalation of allergen. The treatment alleviated the early reaction in six of the patients. A late reaction occurred in all patients with an immediate response. The non-specific bronchial reactivity to methacholine was assessed in 24 patients before allergen challenge. No relation was found between this reactivity and the observed patterns of reactions to allergen. It was concluded that the occurrence of a late bronchial response probably depends on the dose of allergen administered but is independent of the degree of unspecific bronchial responsiveness to methacholine prior to the challenge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1990.tb00495.x
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