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  • 1
    Electronic Resource
    Electronic Resource
    X-ray crystal structure of the nitrogenase molybdenum-iron protein from Clostridium pasteurianum at 3.0-.ANG. resolution (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 7104-7115 
    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/bi00079a006
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  • 2
    Electronic Resource
    Electronic Resource
    Cholecystokinin dipeptoid antagonists: design, synthesis, and anxiolytic profile of some novel CCK-A and CCK-B selective and mixed CCK-A/CCK-B antagonists (1993)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 36 (1993), S. 552-565 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00057a005
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogenase: A Nucleotide-Dependent Molecular Switch (1994)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 63 (1994), S. 235-264 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.63.070194.001315
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of oxygen concentration on changes in the microbial population, temperature and dry-matter content in grass silage (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 49 (1994), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The effects of transfusing cores of grass silage with mixtures of oxygen and nitrogen containing 0%, 0·2%, 2%, 5% and 20% oxygen were investigated. Changes in populations of yeasts, lactobacilli and streptococci were measured and the relationship between populations after 7 days' transfusion and oxygen concentration were tested against the predictions of two models, based on Monod and logistic growth functions. Yeasts were related to oxygen by the Monod model, while lactobacilli and streptococci were related by the logistic model. The differences were ascribed to yeasts initiating deterioration by growing aerobically, while lactobacilli and streptococci grew fermentatively once the environment had changed following yeast growth. Dry-matter losses were related to oxygen by the Monod model. Changes in temperature were related to dry matter loss (through measurements of CO2 evolution) using a simple heat balance model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1994.tb01991.x
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  • 5
    Electronic Resource
    Electronic Resource
    THE FATIGUE LIFE OF THICK-WALLED AUTOFRETTAGED CYLINDERS WITH CLOSED ENDS (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 14 (1991), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— It is well known that the fatigue strength of a thick-walled cylinder is enhanced by autofrettage. However, this does not appear to have been explained from fracture mechanics. The present paper shows that two uncertainties arise when this is attempted. Firstly, the distribution of residual stress resulting from the autofrettage pressure must be estimated and secondly a realistic stress intensity factors for subsequent fatigue cracking must be defined. A number of available stress intensity solutions are modified with the author's predictions to the residual stress following an elastic-plastic autofrettage pressure in a closed cylinder of hardening material. A comparison with experiment has enabled the various approaches to be appraised. It is shown that a modified stress intensity factor of Bowie and Freese is most consistent with the propagation fatigue life observed in autofrettaged cylinders provided their solution is adapted to account for the propagation of a semi-elliptical crack front in the presence of residual stress. Other K1 estimates appear to lead to dangerously optimistic predictions particularly within the range of fluctuating pressure where failure occurs between 105 and 106 cycles. The contribution to fatigue failure from initiation cycles is expressed as a power function of the observed life for cyclic pressures in the region of the fatigue limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00642.x
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  • 6
    Electronic Resource
    Electronic Resource
    Ionization Coefficients in Helium at High Pressures (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 58-59 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is the purpose of this note to report preliminary measurements on pre-breakdown ionization currents in uniform fields in helium over the range 3 〈 E/p 〈 5 V cm?1 mm Hg?1 for pressures between 150 and 560 mm mercury. The measurements were carried out using a specially designed parallel ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200058a0
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  • 7
    Electronic Resource
    Electronic Resource
    Water-soluble Polysaccharides of Porphyra Species : a Note on the Classification of P. naiadum (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 398-399 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is already known2-3 that the water-soluble polysaccharides of certain Porphyra species contain residues of D-galactose, L-galactose, 3,6-anhydro-L-galactose, 6-0-methyl-D -galactose and ester sulphate, and that the relative proportions of some of these components vary from sample to sample. It ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/195398a0
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  • 8
    Electronic Resource
    Electronic Resource
    Isolation of L -Galactose-6-sulphate from a Seaweed Polysaccharide (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 831-832 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our earlier work6*7 has shown that porphyran contains residues of D-galactose, L-galactose, 6-O-methyl-"-galactose, 3,6-anhydro-L-galactose and ester sulphate respectively in the molar ratios 100: 110: 118: 73: 140. A similar polysaccharide has been isolated from Porphyra capensis8. The fact ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189831a0
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  • 9
    Electronic Resource
    Electronic Resource
    An envelope-based approach for direct phase determination of macromolecular structures (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 915-922 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An initial electron density distribution for a crystal structure may be directly derived from observed diffraction data by maximizing the product of the observed and calculated Patterson functions with respect to the electron density values within an envelope. This maximization problem may be formulated as an eigenvalue equation, in which potential electron density distributions are obtained as eigendensities (eigenvectors) of a symmetric matrix. Elements of this matrix depend only on the indices and intensities of the observed reflections, and on the coordinates of grid points inside the envelope. Eigendensities are calculated for a set of small envelopes (enclosing about 20% of the molecular volume) covering a unique region of the unit cell whose points are unrelated by space-group operations, origin shifts or changes in enantiomorph. On the basis of correlation coefficients between the observed and calculated values for both the Patterson function and structure factor amplitudes, a small set of eigendensities are selected for combination into a final electron density distribution. This electron density distribution may be Fourier transformed to yield calculated structure factors. Test calculations on lysozyme indicate that phase errors of less than 60° may be obtained for strong low-resolution reflections by this procedure. An extension of this approach to handle crystal structures containing non-crystallographic symmetry is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390006705
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  • 10
    Electronic Resource
    Electronic Resource
    Crystallization and X-ray structure determination of cytochrome c2 from Rhodobacter sphaeroides in three crystal forms (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 596-602 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Cytochrome c2 serves as the secondary electron donor that reduces the photo-oxidized bacteriochlorophyll dimer in photosynthetic bacteria. Cytochrome c2 from Rhodobacter sphaeroides has been crystallized in three different forms. At high ionic strength, crystals of a hexagonal space group (P6122) were obtained, while at low ionic strength, triclinic (P1) and tetragonal (P41212) crystals were formed. The three-dimensional structures of the cytochrome in all three crystal forms have been determined by X-ray diffraction at resolutions of 2.20 Å (hexagonal), 1.95 Å, (triclinic) and 1.53 Å (tetragonal). The most significant difference observed was the binding of an imidazole molecule to the iron atom of the heme group in the hexagonal structure. This binding displaces the sulfur atom of Met l00, which forms the axial ligand in the triclinic and tetragonal structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444994001319
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