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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 11 (1999), S. 2765-2771 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A direct numerical simulation (DNS) database is used to develop a model of subgrid-scale temperature fluctuations for use in large-eddy simulations of turbulent, reacting hypersonic flows. The proposed model uses a probability density representation of the temperature fluctuations. The DNS database reveals a physically consistent relation between the resolved-scale flow conditions that may be used to predict the standard deviation of the Gaussian probability density function (PDF). The model is calibrated and tested by comparison to simulations of decaying isotropic turbulence. The conditional single-variable PDF model is found to capture the fluctuations in temperature and product formation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    R & D management 22 (1992), S. 0 
    ISSN: 1467-9310
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: AbstractFor many firms, entering into some form of collaborative arrangement with other organizations has become a necessary step towards improving their competitive positions. This is particularly true of research intensive companies which frequently participate in such strategic alliances (SAs). This paper reports on the experiences of some 70 North American firms with SAs in the biotechnology industry. The sample includes small dedicated biotechnology companies (DBCs) and large organizations, such as pharmaceutical firms.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-4812
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1673-1675 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In nonlinear optics applications employing quasiphase matching, short-pitch domain gratings are generally required for the efficient generation of visible and ultraviolet light. Here we introduce an improved electric-field poling technique, which incorporates spontaneous backswitching and leads to uniform short-pitch domain structures. The total volume of backswitched material, and hence the duty cycle of the backswitched domain grating, can be accurately controlled. First-order single-pass continuous-wave second harmonic generation of 60 mW at 460 nm is achieved at 6.1%/W efficiency in 0.5-mm-thick 4-μm-period backswitch-poled lithium niobate. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the European Academy of Dermatology and Venereology 1 (1992), S. 0 
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The success of the immunofluorescence technique has as its basis a specific immune reaction which is readily influenced by physicochemical variables. In all procedures careful examination with appropriate selection of materials and conjugates and careful observation must be made. Proper controls are required to interpret specific reactions and distinguish these from nonspecific artefacts and other patterns which cause diagnostic confusion. The recognition of immunofluorescence artefact patterns is essential to the trainee who is gaining experience in immunofluorescence microscopy. However, the correct diagnosis in the individual patient is further insured by correlating all the relevant clinical and histological details with the immunofluorescent findings.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 55 (1992), S. 245-248 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 15 (1992), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Deuterium NMR at the natural abundance was used to determine the site-specific isotope ratios (D/H)i of the non-equivalent isotopomers of various chemical species which exist in plant products. The deuterium distribution in glucose, galactose and mannitol samples from different botanical and compartmental origins is discussed in terms of the influence of plant metabolism and environmental factors. Particular emphasis is given to the potential versatility of deuterium NMR in the study of natural isotopic distribution in pro-chiral situations. Typical examples of chiral recognition are given in the field of glycolysis metabolites (ethanol, amino-acids) and of monoterpene biosynthesis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 13 (1992), S. 0 
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The objective of this study was to determine whether melatonin (aMT) influences the postnatal development of the mammary gland parenchyma in female mice from the time of weaning to adulthood. Twenty-one-day-old female BALBc mice were treated with daily subcutaneous injections of aMT (200 (μg) or diluent, 3 hr before the onset of darkness (photoperiod LD 12:12). At 3, 5, 7, 9, 11, and 13 weeks of age, batches of 20 animals (ten controls and ten aMT-treated) were sacrificed and the second pair of mammary glands were dissected to evaluate their degree of development. Melatonin decreased body weight gain from 2 weeks before until 2 weeks after the onset of puberty. Treatment with aMT also resulted in a lower DNA content and smaller area of the mammary gland from the time of puberty until the end of the study. In aMT-treated mice the phase of highly positive allometric growth began 2 weeks later, but ended at the same time as in controls (11th week of life). Finally, aMT decreased the development of terminal, lateral, and alveolar buds while it increased the number of terminal ducts per gland. We conclude that pharmacological doses of aMT (1) reduce body weight gain at the peripuberal age; (2) partially inhibit postnatal mammary gland development by reducing the number of epithelial structures representing sites of growth and increasing that of structures representing the final state of ductal growth in virgin animals; (3) delay the onset of and shorten the phase of rapid mammary growth occurring in early postpuberal age.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food process engineering 15 (1992), S. 0 
    ISSN: 1745-4530
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Four different methods of oven roasting beef were studied. Twelve semi-tendinosus muscles were transversely divided, and the 24 subsamples were allocated to 4 cooking methods: High temperature roasting (HTR) with a constant oven temperature of 170C; low temperature roasting (LTR) with a constant oven temperature of 120C; maximum temperature roasting (MTR) with maximally 70C 1 cm below the roast surface and temperature difference roasting (TDR) with constantly 50C between the oven and 1 cm below the roast surface. Quality parameters measured were cooking loss, Warner-Bratzler shear parameters and taste panel ratings.Mean heating times of HTR, LTR, MTR and TDR were 69, 100, 79 and 157 min, respectively. Most of the quality parameters by HTR were significantly poorer as compared with the other methods, while differences between LTR, MTR and TDR were small.Surface heat transfer coefficient was estimated as 14.1 W/m2C. Heating times were predicted with a maximum deviation of 10%.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 8 (1992), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Die Verteilung des Polypeptids Neurophysin wurde mittels Immunhistochemie im Hypothalamus des Buntbarsches Cichlasoma nigrofasdatum untersucht. Eine definierte Population von Neurophysinimmunreaktiven Nervenzellen wurde subependymal entlang des 3. Ventrikels innerhalb des magnozellularen Nucleus präopticus nachgewiesen. Von diesen Zellen geht eine Projektion von Nervenfasern aus, die bogenförmig in ventromedialer Richtung zur Neurohypophyse zieht, wo eine roße Dichte immunreaktiver Variositäten nachweisbar ist. Die immunhistochemische Untersuchung enachbarter Schnitte mit einem Antiserum geen Vasotocin ergab eine Überlappung Vasotocin positiver Neurone mit der Lokalisation von Neurokysin. Der Vergleich mit Studien an anderen Vertebraten zeigte eine gute Korrelation mit unseren Befunden. Unsere Ergebnisse unterstützen somit die Hypothese, daß das System neurosekretorischer Neurone eine allgemeine Bedeutung für endokrine Regulationsmechanismen im Gehirn von Teleostei besitzen.〈section xml:id="abs1-2"〉〈title type="main"〉Summary Localization of neurophysin-immunoreactive neurons in the hypothalamus of the South American cichlid Cichlasoma nigrofasciatumThe distribution of the polypeptide neurophysin was examined by immunohistochemistry in the hypothalamus of the cichlid Cichlasoma nigrofasciatum. A distinct group of neurophysin-immunoreacrive nerve cells was found along the subependymal lining in an area belonging to the magnocellular preoptic nucleus. An arched bundle of neurophysin fibers originating from these cells travelled in ventromedial direction to the posterior pituitary, where a high density of immunopositive varicosities was observed. Additional investigation of neighbouring sections using an antiserum against vasotocin revealed an overlap of vasotocin positive neurons with the localization observed for neurophysin. A comparison with studies in other vertebrates demonstrated a good correlation with our results. Thus, our findings support the hypothesis that the system of neurosecretory neurons may be of general functional importance for neuroendocrine regulatory mechanisms in the brains of teleosts.
    Type of Medium: Electronic Resource
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