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  • 1
    Electronic Resource
    Electronic Resource
    Solution structure of .gamma.1-H and .gamma.1-P thionins from barley and wheat endosperm determined by proton NMR: a structural motif common to toxic arthropod proteins (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 715-724 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00053a041
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  • 2
    Electronic Resource
    Electronic Resource
    Total immunoreactive proinsulin, immunoreactive insulin and specific insulin in relation to conversion to NIDDM: the Mexico City Diabetes Study (1997)
    Springer
    Diabetologia 40 (1997), S. 830-837 
    Details
    ISSN: 1432-0428
    Keywords: Keywords Insulin ; proinsulin ; insulin secretion ; non-insulin-dependent diabetes mellitus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Although insulin resistance and decreased insulin secretion are characteristic of established non-insulin-dependent diabetes mellitus (NIDDM), which of these metabolic abnormalities is the primary determinant of NIDDM is still controversial. A disproportionate increase in the proinsulin to insulin ratio has been proposed as a marker of compromised insulin secretion. We examined the association of fasting immunoreactive insulin (which cross-reacts with proinsulin), specific insulin (which does not cross-react with proinsulin), total immunoreactive proinsulin (or insulin precursors), and the fasting proinsulin/specific insulin ratio to the risk of developing NIDDM in the 3.25-year follow-up of the Mexico City Diabetes Study. These measurements were made in 85 subjects who subsequently converted to NIDDM (prediabetic subjects) and in 85 age and gender matched subjects who remained non-diabetic at follow-up (control subjects). Immunoreactive insulin, proinsulin and the proinsulin/specific insulin ratio were significantly higher in prediabetic than in control subjects. However, the relation between specific insulin and the development of NIDDM was weaker than for proinsulin or immunoreactive insulin. After further adjustment for obesity, body fat distribution and glucose tolerance status, proinsulin and the proinsulin/specific insulin ratio, but not specific or immunoreactive insulin, predicted conversion to NIDDM. A high proinsulin/specific insulin ratio predicted conversion to NIDDM both in subjects with normal and those with impaired glucose tolerance at baseline. We conclude that in prediabetic subjects increased proinsulin, a marker of islet cell distress or compromised insulin secretion, is associated with rapid conversion (within 3.25 years) to NIDDM even in obese populations. [Diabetologia (1997) 40: 830–837]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001250050756
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  • 3
    Electronic Resource
    Electronic Resource
    Suprasellar arachnoid cysts in children report of three cases (1982)
    Springer
    Acta neurochirurgica 60 (1982), S. 281-296 
    Details
    ISSN: 0942-0940
    Keywords: Arachnoid cyst ; suprasellar space occupying lesion ; hydrocephalus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three cases of suprasellar arachnoid cysts in children are reported. Incidence, aetiology, pathogenesis, symptomatology, diagnosis, treatment, and other problems of these uncommon lesions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01406313
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  • 4
    Electronic Resource
    Electronic Resource
    Study of Drawing Processes by Analytical and Finite Element Methods (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 526 (Oct. 2006), p. 187-192 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Finite Element Method (FEM) has become an indispensable tool in metal forminganalysis [1,2]. Contrary to the traditional methods, FEM allows to analyze more realistic situations, eithergeometric and tensional. On the other hand, the drawing process is one of the most ancient metal formingoperations and, nowadays, this process is widely used in industrial field. However, the influence of themain parameters in the mechanics and efficiency of the process has been scarcely studied. Drawingprocesses have been analysed by FEM, assuming plane strain and axisymmetrical conditions in order tocheck the possibility of extrapolating results from one case to another. Besides, this numerical method iscompared with analytical and experimental methods. Also, FEM is used for studying the influence ofseveral technological parameters on variables such as the drawing force or the die pressure, and forobtaining results of stresses and strains in certain regions of the model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.526.187.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    On the applicability of the Redfield high-temperature theory for proton dipolar order relaxation in liquid crystals (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 1530-1535 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nuclear magnetic resonance experiments on the Larmor frequency dependence of the intrapair dipolar order relaxation time T1D showed the existence of discrepancies between the usual two-spin theory and the experimental data. Field-cycling experiments of T1D in methyl deuterated para azoxyanisole (PAA-d6) in the nematic phase [J. Chem. Phys. 110, 8155 (1999)] showed that the difference cannot be assigned to the common assumption of isolated spin pairs or to the neglecting of the alkyl chain protons in the theoretical interpretation. Though the applicability of the spin temperature and short correlation time assumptions have not been justified for nematic liquid crystals, they have been used in all the available theoretical approaches for dipolar order relaxation. In this work, we calculate T1D of PAA-d6 within the Redfield high-temperature theory of spin–lattice relaxation but avoid the usual assumptions of short correlation times and random phase. First, we find that this fact does not alter the expression for T1D in the simple case of an ensemble of isolated spin pairs. Then we take the four benzene protons as the spin system and find that this refinement gives no relevant contribution able to explain the discrepancies between theory and experiments. Also, we find that the random phase assumption becomes redundant in the calculation of T1D, whenever the relevant spin Hamiltonian is nondegenerate. Thus, in these cases the spin temperature hypothesis is justified in liquid crystals, where the spin system contains few spins. We conclude that the Redfield high-temperature relaxation theory fails to describe T1D in thermotropic liquid crystals, since it underestimates the prominent role of the slow cooperative motions. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1423325
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  • 6
    Electronic Resource
    Electronic Resource
    Vibrational coherence and nonadiabatic dynamics in the condensed phase (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 3343-3352 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ultrafast nonradiative relaxation processes after photon excitation at 266 nm of Hg2 trapped in a cryogenic argon matrix are studied by molecular dynamics with quantum transitions. Fourteen electronic surfaces and their corresponding couplings are included in the simulations. The couplings between electronic states are modeled using a diatomics-in-molecules treatment of the mixing of the different states of Hg2 induced by the Ar atoms. While the initially excited electronic state is the D1u state, we observe that after 10 ps of dynamics most of the electronic population (90%) is in the A0g± states. The majority of nonadiabatic jumps take place in the first 2 ps of the dynamics and at large Hg–Hg nuclear distances close to the Franck–Condon region of excitation. These results confirm predictions from previous experimental steady-state spectroscopic studies. Finally, we also demonstrate the conservation of vibrational coherence of the Hg2 stretching mode during the first few picoseconds, despite several nonadiabatic crossing events during this time. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1434996
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  • 7
    Electronic Resource
    Electronic Resource
    Optimization of quantitative X-ray phase analysis by Monte Carlo methods (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 622-626 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Present methods for quantitative X-ray phase analysis make extensive use of multilinear regression. Practical application of these methods compels workers to make a choice among many different sets of experimental conditions such as the number, identity and relative concentration of the phases in the synthetic mixtures used for the solution of the regression problem; the number and extent of the angular regions within which X-ray intensities are to be measured; and so on. There are as yet no general criteria for this selection, and classical statistical experimental methods, even such effective ones as SIMPLEX, are very time consuming. In the present work a Monte Carlo method is proposed for optimization of the reproducibility and detection limit for a completely general quantitative X-ray phase analysis. A system of three computer programs to this end is developed and applied to X-ray phase analysis of laterites, illustrating the choice of a set of performing conditions among 20 of them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387098829
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  • 8
    Electronic Resource
    Electronic Resource
    General theory of the effect of granularity in powder X-ray diffraction (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 769-774 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The effect of granularity in powder X-ray diffraction is reviewed, and the shortcomings of previously developed models in explaining this effect are described. A new physical model encompassing all aspects of this phenomenon is proposed. Mathematical formulae based on the model are derived, and their limit cases are discussed. Values of the theoretical intensities from the model are compared with results from a specially designed experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387098544
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Identification and Purification of the Vasopressin Receptor from Rat Liver Membranes (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 689 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb55584.x
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  • 10
    Electronic Resource
    Electronic Resource
    Structure of Neurosecretory Granules and the Chemistry of Exocytosis (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 689 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb55537.x
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