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  • 1
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 57 (1992), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A laboratory thermal processing unit and reactor cell were adapted to aseptically process browned and unbrowned cubes from Choice an Utility Grade beef. Processing parameters of heating medium flow rate, time and temperature were established. Processed product was analyzed for changes in flavor and texture on day 0 and after 30 days refrigerated storage. Because sterility of each sample was not verified, sensory evaluation was only performed at day 0. Pre-browning improved flavor quality and did not reduce tenderness or yield. Low quality beef could be effectively utilized with proper processing parameters. Lipid oxidation and loss of sulfur compounds during storage were limiting factors in aseptically processing beef particulates.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Neutral lipid (NL) and phospholipid (PL) fractions and their corresponding fatty acid (FA) profiles from the L. dorsi of Angus-Hereford heifers (n=27) were compared as a function of forage grazing (FG) and time in the feedlot after grazing (DIF) on pasture. There were no differences in total PL content or FA composition of the individual PL as influenced by initial FG. As DIF increased, there was an increase in PL concentration and significant changes in the FA composition of the total PL and several of the individual PL fractions, separated by high performance liquid chromatography. Total PL content and FA content of the individual PL were significantly correlated with differences in the flavor characteristics of ground beef which were determined by a descriptive panel.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Neutral lipid (NL) and phospholipid (PL) fractions and their corresponding fatty acid profiles from the L. dorsi of Bison, Hereford, and Brahman steers of similar age finished on identical diets were determined. Compositional differences were related to sensory characteristics of the samples. Phosphatidylcholine + lysophosphatidylethanolamine (PC + LPE) existed in the highest concentration in all samples evaluated followed by lysophosphatidylcholine (LPC), phosphatidylethanolamine (PE), sphingomyelin (SPH), fraction one and phosphatidylserine (PS). Bison contained more total PL, particularly PC + LPE and LPC, than the other two bovine species. Polyunsaturated fatty acid (PUFA) composition of these PL was greater for Bison. Off-flavor and aftertaste increased with increasing levels of PC + LPE and LPC due to their greater composition of PUFA.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 176-176 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE distribution and physical properties of the neutral interstellar gas in our galaxy have been major subjects of investigation since the discovery of interstellar atomic hydrogen in 1951. With the discovery 12 years ago of interstellar molecules as a new investigative tool, these studies have ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 15 (1980), S. 79-101 
    ISSN: 1432-1432
    Keywords: Molecules ; Interstellar ; Chemistry ; Isotopes ; Solar system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The study of interstellar molecules broadly includes two areas of interest. One area uses the unique ability of molecules to act as probes of the physical conditions in the cold, dense, visually opaque component of the interstellar medium. The physical properties of this and other components of the interstellar medium are summarized. The other area deals with the chemistry of interstellar molecules, recent aspects of which are emphasized in this review. Gas-phase chemistry, shock chemistry, and grain surface chemistry are discussed in the context of recent observations. No present observations suggest that surface reactions are relevant, but neither can they be ruled out. Ion-molecule reactions are clearly operative, at least for the simpler species. Chemical isotope fractionation is reviewed, andd it is concluded that the complexities of the chemistry allow no cosmological conclusions to be drawn from observations of deuterium in interstellar molecules, while the presence of13C in interstellar molecules permits an estimate of the12C/13C ratio which is consistent with the current concepts of the nucleosynthesis history of the Galaxy. Possible connections between interstellar molecules and the early molecular history of the solar system are discussed.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Space science reviews 51 (1989), S. 235-337 
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Models of the four currently recognized regimes of astrochemistry are compared with observations. Ion-Molecule Gas Phase Chemistry is fundamental throughout all interstellar and circumstellar molecular clouds, and by itself explains fairly well the simpler molecular species in diffuse and cold quiescent dense interstellar clouds, as well as in the outer envelopes of circumstellar clouds. Dust-Grain Chemistry may modify ion-molecule chemistry noticeably in regions containing UV radiation, shocks, or other heating agents which can serve to promote surface reactions and to desorb molecules frozen on grains; it likely plays no role in cold quiescent clouds except to adsorb gas phase molecules. Shock Chemistry occurs in regions of star formation and appears important in explaining certain molecular species and in disrupting grains. Circumstellar envelopes combine several chemistries, including those of thermochemical equilibrium in the dense inner regions, and ion-molecule in the outer regions, with grain processes also likely. The limitations of all current models are lack of knowledge of reaction rates, of detailed physical conditions (interstellar clouds), and of the relative depletions (onto grains) of the chemical elements, as well as grain surface chemistry in general. In both interstellar and circumstellar objects, ion-molecule gas phase models are now quite successful in explaining, semi-quantitatively, observed species with up to 4 atoms, but difficulties remain for larger species, as well as the state of carbon, and the models are not yet very predictive.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 224 (1995), S. 297-303 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The list of detected refractory-element (RE) species in IRC10216 is now large enough to try to assess their chemistry, and the fraction of each that escapes in gas phase to the ISM. The former may tell us how grains are formed, the latter whether mass-loss from evolved stars is important in determining interstellar elemental depletions as distinct from accretion processes in the ISM. We expect that much of the Si chemistry is now understood and about 25% of Si escapes as a gas. Other REs are less well understood but most should be more volatile than Si. For many of the REs, O-rich CSEs should behave similarly to C-rich ones.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1368-1375 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Problems associated with the repair of fractured plastic car bumpers by traditional hot gas welding have been identified. In particular, interfacial cracks arising due to contraction stresses, weld pores, root notches, and voids in filler rods have been observed. These result in welds with inferior mechanical properties. Even so the impact properties and strength of plastic bumpers which were fractured and have been repaired by hot gas welding are likely to be acceptable for the purposes that the bumpers are intended. We have considered three materials: a polycarbonate/polyester blend, poly(butylene terephthalate), and an ethylene-propylene-diene rubber. Improvements in weld strength and interfacial bonding arise if a heated roller immediately following the welding torch is used to consolidate and compress the molten plastic. Porosity is reduced if the hot gas can escape easily from beneath the weld.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
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