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Marie-therese Miquel – One of the best experts on this subject based on the ideXlab platform.

  • Cuticular Hydrocarbons of Calliphora vomitoria (Diptera): relation to age and sex.
    General and Comparative Endocrinology, 1992
    Co-Authors: Marie Trabalon, Mireille Campan, Jean-luc Clement, C Lange, Marie-therese Miquel
    Abstract:

    Changes in epicuticular Hydrocarbon content and composition were examined from 3 to 120 hr postemergence in both sexes of Calliphora vomitoria. n-Alkanes and mono- and dimethylakanes with 20 to 31 carbon atoms were the major Hydrocarbons detected. Alkenes were only detected in the females. Males had fewer Hydrocarbons (40 versus 49 for the females). In males this number remained constant from 3 to 120 hr, whereas in females the number increased progressively from 3 to 48 hr. The males had a greater total of Hydrocarbons than the females (×6 versus ×3.5). They had significantly more Hydrocarbons by 48 hr, the time of sexual maturation, while in females, the Hydrocarbon content increased between 6 and 24 hr postemergence, just before the onset of previtellogenesis. Hydrocarbon synthesis continued up to 120 hr in males, but remained constant in the females after 24 hr. Hydrocarbon composition differed in males and females and between the young (3 and 6 hr) and the older animals (24 to 120 hr). The young animals were characterized by the presence of monomethylalkanes with chain lengths over 25C and the older animals by monomethylalkanes with chain lengths

  • cuticular Hydrocarbons of calliphora vomitoria diptera relation to age and sex
    General and Comparative Endocrinology, 1992
    Co-Authors: Marie Trabalon, Mireille Campan, Jean-luc Clement, C Lange, Marie-therese Miquel
    Abstract:

    Changes in epicuticular Hydrocarbon content and composition were examined from 3 to 120 hr postemergence in both sexes of Calliphora vomitoria. n-Alkanes and mono- and dimethylakanes with 20 to 31 carbon atoms were the major Hydrocarbons detected. Alkenes were only detected in the females. Males had fewer Hydrocarbons (40 versus 49 for the females). In males this number remained constant from 3 to 120 hr, whereas in females the number increased progressively from 3 to 48 hr. The males had a greater total of Hydrocarbons than the females (×6 versus ×3.5). They had significantly more Hydrocarbons by 48 hr, the time of sexual maturation, while in females, the Hydrocarbon content increased between 6 and 24 hr postemergence, just before the onset of previtellogenesis. Hydrocarbon synthesis continued up to 120 hr in males, but remained constant in the females after 24 hr. Hydrocarbon composition differed in males and females and between the young (3 and 6 hr) and the older animals (24 to 120 hr). The young animals were characterized by the presence of monomethylalkanes with chain lengths over 25C and the older animals by monomethylalkanes with chain lengths <25C. Alkenes were found only in females. The males were characterized by the presence of di- and monomethylalkanes with 23, 24, and 26 carbon atoms.

Allen H Goldstein – One of the best experts on this subject based on the ideXlab platform.

  • quantification of isomerically summed Hydrocarbon contributions to crude oil by carbon number double bond equivalent and aromaticity using gas chromatography with tunable vacuum ultraviolet ionization
    Analyst, 2018
    Co-Authors: Jeremy A Nowak, Robert J Weber, Allen H Goldstein
    Abstract:

    The ability to structurally characterize and isomerically quantify crude oil Hydrocarbons relevant to refined fuels such as motor oil, diesel, and gasoline represents an extreme challenge for chromatographic and mass spectrometric techniques. This work incorporates two-dimensional gas chrochromatography coupled to a tunable vacuum ultraviolet soft photoionization source, the Chemical Dynamics Beamline 9.0.2 of the Advanced Light Source at the Lawrence Berkeley National Laboratory, with a time-of-flight mass spectrometer (GC × GC-VUV-TOF) to directly characterize and isomerically sum the contributions of aromatic and aliphatic species to Hydrocarbon classes of four crude oils. When the VUV beam is tuned to 10.5 ± 0.2 eV, both aromatic and aliphatic crude oil Hydrocarbons are ionized to reveal the complete chemical abundance of C9–C30 Hydrocarbons. When the VUV beam is tuned to 9.0 ± 0.2 eV only aromatic Hydrocarbons are ionized, allowing separation of the aliphatic and aromatic fractions of the crude oil Hydrocarbon chemical classes in an efficient manner while maintaining isomeric quantification. This technique provides an effective tool to determine the isomerically summed aromatic and aliphatic Hydrocarbon compositions of crude oil, providing information that goes beyond typical GC × GC separations of the most dominant Hydrocarbon isomers.

Marie Trabalon – One of the best experts on this subject based on the ideXlab platform.

  • Cuticular Hydrocarbons of Calliphora vomitoria (Diptera): relation to age and sex.
    General and Comparative Endocrinology, 1992
    Co-Authors: Marie Trabalon, Mireille Campan, Jean-luc Clement, C Lange, Marie-therese Miquel
    Abstract:

    Changes in epicuticular Hydrocarbon content and composition were examined from 3 to 120 hr postemergence in both sexes of Calliphora vomitoria. n-Alkanes and mono- and dimethylakanes with 20 to 31 carbon atoms were the major Hydrocarbons detected. Alkenes were only detected in the females. Males had fewer Hydrocarbons (40 versus 49 for the females). In males this number remained constant from 3 to 120 hr, whereas in females the number increased progressively from 3 to 48 hr. The males had a greater total of Hydrocarbons than the females (×6 versus ×3.5). They had significantly more Hydrocarbons by 48 hr, the time of sexual maturation, while in females, the Hydrocarbon content increased between 6 and 24 hr postemergence, just before the onset of previtellogenesis. Hydrocarbon synthesis continued up to 120 hr in males, but remained constant in the females after 24 hr. Hydrocarbon composition differed in males and females and between the young (3 and 6 hr) and the older animals (24 to 120 hr). The young animals were characterized by the presence of monomethylalkanes with chain lengths over 25C and the older animals by monomethylalkanes with chain lengths

  • cuticular Hydrocarbons of calliphora vomitoria diptera relation to age and sex
    General and Comparative Endocrinology, 1992
    Co-Authors: Marie Trabalon, Mireille Campan, Jean-luc Clement, C Lange, Marie-therese Miquel
    Abstract:

    Changes in epicuticular Hydrocarbon content and composition were examined from 3 to 120 hr postemergence in both sexes of Calliphora vomitoria. n-Alkanes and mono- and dimethylakanes with 20 to 31 carbon atoms were the major Hydrocarbons detected. Alkenes were only detected in the females. Males had fewer Hydrocarbons (40 versus 49 for the females). In males this number remained constant from 3 to 120 hr, whereas in females the number increased progressively from 3 to 48 hr. The males had a greater total of Hydrocarbons than the females (×6 versus ×3.5). They had significantly more Hydrocarbons by 48 hr, the time of sexual maturation, while in females, the Hydrocarbon content increased between 6 and 24 hr postemergence, just before the onset of previtellogenesis. Hydrocarbon synthesis continued up to 120 hr in males, but remained constant in the females after 24 hr. Hydrocarbon composition differed in males and females and between the young (3 and 6 hr) and the older animals (24 to 120 hr). The young animals were characterized by the presence of monomethylalkanes with chain lengths over 25C and the older animals by monomethylalkanes with chain lengths <25C. Alkenes were found only in females. The males were characterized by the presence of di- and monomethylalkanes with 23, 24, and 26 carbon atoms.

Franz Schinner – One of the best experts on this subject based on the ideXlab platform.

Jeremy A Nowak – One of the best experts on this subject based on the ideXlab platform.

  • quantification of isomerically summed Hydrocarbon contributions to crude oil by carbon number double bond equivalent and aromaticity using gas chromatography with tunable vacuum ultraviolet ionization
    Analyst, 2018
    Co-Authors: Jeremy A Nowak, Robert J Weber, Allen H Goldstein
    Abstract:

    The ability to structurally characterize and isomerically quantify crude oil Hydrocarbons relevant to refined fuels such as motor oil, diesel, and gasoline represents an extreme challenge for chromatographic and mass spectrometric techniques. This work incorporates two-dimensional gas chromatography coupled to a tunable vacuum ultraviolet soft photoionization source, the Chemical Dynamics Beamline 9.0.2 of the Advanced Light Source at the Lawrence Berkeley National Laboratory, with a time-of-flight mass spectrometer (GC × GC-VUV-TOF) to directly characterize and isomerically sum the contributions of aromatic and aliphatic species to Hydrocarbon classes of four crude oils. When the VUV beam is tuned to 10.5 ± 0.2 eV, both aromatic and aliphatic crude oil Hydrocarbons are ionized to reveal the complete chemical abundance of C9–C30 Hydrocarbons. When the VUV beam is tuned to 9.0 ± 0.2 eV only aromatic Hydrocarbons are ionized, allowing separation of the aliphatic and aromatic fractions of the crude oil Hydrocarbon chemical classes in an efficient manner while maintaining isomeric quantification. This technique provides an effective tool to determine the isomerically summed aromatic and aliphatic Hydrocarbon compositions of crude oil, providing information that goes beyond typical GC × GC separations of the most dominant Hydrocarbon isomers.