نتایج جستجو برای: hydrocarbons

تعداد نتایج: 26785  

Journal: :Journal of insect physiology 2008
Melissa L Thomas Leigh W Simmons

Sexual dimorphism is presumed to reflect adaptive divergence in response to selection favouring different optimal character states in the two sexes. Here, we analyse patterns of sexual dimorphism in the cuticular hydrocarbons of the Australian field cricket Teleogryllus oceanicus using gas chromatography. Ten of the 25 peaks found in our chromatographs, differed in their relative abundance betw...

Journal: :Meat science 2011
K C Nam E J Lee D U Ahn J H Kwon

To determine the effects of irradiation on the chemical attributes of sausages, TBARS values, volatile compounds, gaseous compounds, and hydrocarbons of vacuum-packaged sausages were analyzed during 60 d of refrigerated storage. A sulfur-containing volatile (dimethyl disulfide), a gas (methane), and radiation-induced hydrocarbons (1-tetradecene, pentadecane, heptadecane, 8-heptadecene, eicosane...

2002
J. H. Wagner C. H. Lillie M. D. Dupuis H. H. Hill

The ionization response of hydrocarbons In a hydrogen-atmosphere flame was compared to that of a normal flame ionization detector used in gas chromatography. Absolute response in the hydrogen-atmosphere flame lonizatlon detector (HAFID) was found to be two orders of magnitude less than that of the normal FID. This reduced response is attributed both to oxidation of hydrocarbons in the precombus...

2005
Jack DeRuiter

Hydrocarbons are organic compounds consisting of C-C and C-H bonds. Carbon has a valence of four and thus requires four electrons or bonds to complete its octet in the neutral state. Hydrogen has a valence of one and thus requires a single electron or bond to complete its "duet" in the neutral state. Thus in hydrocarbons carbon can form neutral bonding arrangements by forming single bonds with ...

2006
Toshio Kuroki Charles Heidelberger

The binding of several labeled carcinogenic hydrocarbons to macromolecular constituents of various cells involved in systems for chemical carcinogenesis in vitro was studied. The hydrocarbons were firmly bound to the DNA, RNA, and proteins of cultured embryonic cells from C3H mice and hamsters and of various cells derived from C3H mouse prostates. The extent of binding in the embryonic cells wa...

2008
Jasmin Shah M. Rasul Jan Fazal Mabood

The waste tyres represent a source of energy and valuable hydrocarbon products. Waste tyres were pyrolysed catalytically in a batch reactor under atmospheric pressure. The effects of basic catalysts (MgO and CaCO3) were studied on the pyrolysis products. The distribution ratio of gas, liquid and char with MgO and CaCO3 were 24.4:39.8:35.8 wt % and 32.5:32.2:35.2 wt % respectively at 350°C for 2...

Journal: :Journal of occupational health 2004
Grazyna Bieniek Slawomir Kurkiewicz Tadeusz Wilczok

A method for the qualitative analysis of aromatic hydrocarbons in air and their various urinary metabolites is presented. The air was sampled in charcoal tubes and extracted with carbon disulfide. The hydrocarbons were identified as being aliphatic hydrocarbons (C(9)-C(19)), aromatic hydrocarbons and heterocyclic compounds. The urinary metabolites after enzymatic hydrolysis were analyzed by sol...

Journal: :Science 2008
Giora Proskurowski Marvin D Lilley Jeffery S Seewald Gretchen L Früh-Green Eric J Olson John E Lupton Sean P Sylva Deborah S Kelley

Low-molecular-weight hydrocarbons in natural hydrothermal fluids have been attributed to abiogenic production by Fischer-Tropsch type (FTT) reactions, although clear evidence for such a process has been elusive. Here, we present concentration, and stable and radiocarbon isotope, data from hydrocarbons dissolved in hydrogen-rich fluids venting at the ultramafic-hosted Lost City Hydrothermal Fiel...

2011
Fuji Zhang Xiaofeng Guo Heping Zhang

Clar's aromatic sextet theory provides a good means to describe the aromaticity of benzenoid hydrocarbons, which was mainly based on experimental observations. Clar defined sextet pattern and Clar number of benzenoid hydrocarbons, and he observed that for isomeric benzenoid hydrocarbons, when Clar number increases the absorption bands shift to shorter wavelength, and the stability of these isom...

Journal: :Cancer research 1971
T Kuroki C Heidelberger

The binding of several labeled carcinogenic hydrocarbons to macromolecular constituents of various cells involved in systems for chemical carcinogenesis in vitro was studied. The hydrocarbons were firmly bound to the DNA, RNA, and proteins of cultured embryonic cells from C3H mice and hamsters and of various cells derived from C3H mouse prostates. The extent of binding in the embryonic cells wa...

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