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  • 1
    Electronic Resource
    Electronic Resource
    Resolution of an alkyl aryl ketone with asymmetry due to restricted rotation about the carbonyl group (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 5043-5044 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01020a059
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  • 2
    Electronic Resource
    Electronic Resource
    Osteoporosis, sedentary lifestyle, and increasing hip fractures: Pathogenic relationship or differential survival bias (1994)
    Springer
    Calcified tissue international 55 (1994), S. 87-89 
    Details
    ISSN: 1432-0827
    Keywords: Osteoporosis ; Hip fracture ; Aging ; Cohorts ; Epidemiologic bias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Osteoporosis, although a disorder of antiquity, has become more prevalent in developed countries and is a major risk factor for skeletal fracture. Accordingly, the increasing incidence of hip fracture among the elderly within developed nations has been attributed to an increased prevalence of osteoporosis. An increasingly sedentary lifestyle has been suggested as a significant contributing factor for the increased prevalence of osteoporosis. However, differential survival, reflecting changing competing mortality risks, will alter the gene pool of a surviving population cohort. Thus, the gene pool (and hence, disease susceptibilities) of 70-year-old individuals in 1990, for example, should not implicitly be assumed to be the same as 70-year-old individuals in 1950. Consequently, differences in the prevalence of osteoporosis or incidence of hip fracture between current and past elderly cohorts do not necessarily imply differences in environmental risk factors such as levels of physical activity. Instead, variation in competing mortality risks over time may produce differential survival with selection bias and “naturally” lead to increases in the incidence and prevalence of some aging-related disorders such as osteoporosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297180
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  • 3
    Electronic Resource
    Electronic Resource
    One-dimensional model of the physico-chemical processes occurring inside a burning coal surface (1983)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 29 (1983), S. 975-981 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A one-dimensional model has been developed to account for the physicochemical processes occurring inside a burning wet coal surface. The model considers the vaporization of coal moisture and the existence of a moving evaporation front, pyrolysis and char/gas reactions in the hot zone, molecular diffusion and Darcy flow through the dry porous coal, transpiration cooling effect of the water vapor and pyrolysis gases, temperature-dependent reaction kinetics and coal thermal conductivity, and variable porousity of the coal due to pyrolysis and char/gas reactions.The model and associated assumptions have been verified with experimental data from the combustion and drying of coal. The results also show that the model prediction of the heat transferred from the coal surface into the coal is much higher than that calculated by the simple heat conduction equation.The fraction of the water in the coal that reacts with char is shown as a function of the linear burn velocity and the surface temperature. In addition, the effect of variations in coal moisture and the thermal conductivity on the thickness of the dry zone are also shwon.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690290616
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  • 4
    Electronic Resource
    Electronic Resource
    Protein-rejecting ability of surface-bound dextran in end-on and side-on configurations: Comparison to PEG (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 741-747 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: There is much interest in attaching polyethylene glycol (PEG) and other hydrophilic, neutral polymers to surfaces to reduce the extent of protein and cell adsorption. Interestingly, these same surface-bound polymers are effective in masking surface charge and reducing electrokinetic effects such as particle electrophoretic mobility, streaming potential, and electroosmosis. It is apparent that similar molecular properties are responsible for both protein and cell rejection and reduction of electrokinetic effects. In this work we compared the fibrinogen-rejecting ability and the effect on electrophoretic mobility of three polymer coatings bound to polystyrene. The three polymers were side-bound dextran, end-bound dextran, and end-bound PEG. The results of these measurements were used to elucidate the importance of polymer packing density and polymer layer thickness on protein adsorption and reduction of electrokinetic effects. Protein adsorption appears not to be sensitive to polymer layer thickness or the presence of dilute polymer tails in a surface coating, while electrokinetic effects are. Protein adsorption is, however, very sensitive to the availability of exposed surface. Finally, the unique effectiveness of PEG is apparent in this research as in previous studies. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820290610
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of acrylamide initiated by the persulfate-thiosulfate redox couple (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 3167-3181 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conversion-time data were obtained for the polymerization of acrylamide initiated by the redox couple persulfate-thiosulfate by using a dilatometer. A plot of initial rate as a function of thiosulfate concentration shows a well-defined maximum and three distinct regions of behavior. In each region the shape of the conversion-time curves demonstrates the differences in apparent order with respect to monomer arising from changes in initiator concentration during an individual run. A reaction mechanism is proposed to explain the results, and a limiting form of the rate expression is derived for each of the three regions. The ranges of concentration studied are: persulfate, 9.5 × 10-4-4.7 × 10-2M; thiosulfate, 2 × 10-5-2 × 10-2M; initial monomer, 0.05-1.0M; and temperature, 30-50°C. Within these ranges the initial rate shows a halforder dependence on persulfate and a first-order dependence on initial monomer concentration.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150051216
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  • 6
    Electronic Resource
    Electronic Resource
    Persulfate-initiated polymerization of acrylamidePresented to the Divison of Polymer Chemistry, 194th Meeting, American Chemical Society, Detroit, April 1965. (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 3151-3165 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A dilatometric technique was used to obtain conversion-time data for the polymerization of acrylamide initiated by potassium persulfate in water. The results are summarized by the empirical rate expression, -d[M1]/dt = Rp = k1.25[K2S2O8]0.5[M1]1.25, and k1.25 = 1.70 × 1011 exp {-16,900/RT} 1.0.75/mole-0.75-min. Persulfate was varied over the range 9.5 × 10-4 to 5.2 × 10×2 mole/l., and initial monomer concentration [M1] was varied from 0.05 to 0.4 mole/l. The temperature range was 30-50°C. Results of analysis of the kinetics and energetics of the polymerization favor a cage-effect theory rather than a complex-formation theory to explain the order with respect to monomer.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150051215
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  • 7
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    Resolution of an alkyl aryl ketone with asymmetry due to restricted rotation about the carbonyl group (1968)
    American Chemical Society
    Details
    Publication Date: 1968-08-01
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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  • 8
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    Expression of antigenic crossreactivity to RD114 p 30 protein in a human fibrosarcoma cell line. (1977)
    National Academy of Sciences
    Details
    Publication Date: 1977-02-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Investment protection in Colombia: can investors rely on the full protection and security clause? (2014)
    Oxford University Press
    Details
    Publication Date: 2014-05-27
    Description: With international arbitrations plaguing the rest of Latin America, Colombia has become the new hot spot for petroleum investment due to its attractive foreign investment policies. Unfortunately, foreign investors are not the only ones who have taken advantage of this favourable climate; the Revolutionary Armed Forces of Colombia (FARC) have, along with the E&P companies, also taken advantage of the newly liberated and surging Colombian oil and gas sector. However, while the E&P companies are vying for production, FARC has instead used this surging sector to highlight their half-century old struggle against the incumbent Colombian government through increased attacks on the sector. The Transandino pipeline, for example, suffered 51 attacks in 2011, while overall attacks on Colombian pipelines were up 460 per cent in the first seven months of 2012. 1 Coincidentally, oil production in Colombia has nearly doubled since 2007, finally surpassing the 1 million barrel per day mark in December 2012. 2 As the Colombian oil and gas sector continues to grow by leaps and bounds, it is likely that FARC will continue to target this sector for its political attacks. The question facing foreign investors—and what this article proposes to answer—is, ‘what recourse is available in case my investment is attacked?’
    Print ISSN: 1754-9957
    Electronic ISSN: 1754-9965
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Law , Economics
    Published by Oxford University Press
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  • 10
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    The overlooked potential of generalized linear models in astronomy - III. Bayesian negative binomial regression and globular cluster populations (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-28
    Description: In this paper, the third in a series illustrating the power of generalized linear models (GLMs) for the astronomical community, we elucidate the potential of the class of GLMs which handles count data. The size of a galaxy's globular cluster (GC) population ( N GC ) is a prolonged puzzle in the astronomical literature. It falls in the category of count data analysis, yet it is usually modelled as if it were a continuous response variable. We have developed a Bayesian negative binomial regression model to study the connection between N GC and the following galaxy properties: central black hole mass, dynamical bulge mass, bulge velocity dispersion and absolute visual magnitude. The methodology introduced herein naturally accounts for heteroscedasticity, intrinsic scatter, errors in measurements in both axes (either discrete or continuous) and allows modelling the population of GCs on their natural scale as a non-negative integer variable. Prediction intervals of 99 per cent around the trend for expected N GC comfortably envelope the data, notably including the Milky Way, which has hitherto been considered a problematic outlier. Finally, we demonstrate how random intercept models can incorporate information of each particular galaxy morphological type. Bayesian variable selection methodology allows for automatically identifying galaxy types with different productions of GCs, suggesting that on average S0 galaxies have a GC population 35 per cent smaller than other types with similar brightness.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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