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  • 1
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of the peptide methionine sulfoxide reductase from Escherichia coli (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1194-1197 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Peptide methionine sulfoxide reductase mediates the reduction of protein sulfoxide methionyl residues back to methionines and could thus be implicated in the antioxidant defence of organisms. Hexagonal crystals of the Escherichia coli enzyme (MsrA) were obtained by the hanging-drop vapour-diffusion technique. They belong to space group P6522, with unit-cell parameters a = b = 102.5, c = 292.3 Å, γ = 120°. A native data set was collected at 1.9 Å resolution. Crystals of selenomethionine-substituted MsrA were also grown under the same crystallization conditions. A three-wavelength MAD experiment has led to the elucidation of the positions of the Se atoms and should result in a full structure determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900009483
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  • 2
    Electronic Resource
    Electronic Resource
    4-Acetonylidene-1-ethyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e165-e166 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C14H16N2O2, contains a diazepine ring, which appears in a boat conformation. An intramolecular hydrogen bond is formed between the NH group of the diazepine ring and a carbonyl O atom of one of the side chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100003826
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  • 3
    Electronic Resource
    Electronic Resource
    Cyclohexylammonium 2′-hydroxy-2-biphenyl phosphonate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 491-492 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the molecular structure of the title compound, C6H14N+·C12H10O4P−, three O atoms are bonded to phosphorus. The oxygen connected to the biphenoxy residue is not involved in hydrogen bonding; of the other two, one oxygen is involved in intermolecular hydrogen bonding to an N—H group as well as the O—H group of the biphenoxy residue, while the second oxygen is involved in hydrogen bonding to two N—H groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101001184
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute configuration of N-[(–)-2-(7-methoxy-1,2,3,4-tetrahydro-1-naphthyl)ethyl]cyclopropylcarboxamide, a highly potent and selective melatonin analogue (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 100-101 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C17H23NO2, a tetrahydronaphthalenic analogue of melatonin, crystallizes in the monoclinic space group P21 with one molecule in the asymmetric unit. The crystal structure has been determined by X-ray analysis at room temperature. The absolute configuration of this compound was determined unambiguously as R at the chiral naphthalene C-1 position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100014724
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  • 5
    Electronic Resource
    Electronic Resource
    αββα-3,4-Dimethyl-2,5-bis(3,4,5-trimethoxyphenyl)tetrahydrofuran (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 414-416 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure determination of the title compound, C24H32O7, a second isomer of the natural 2,5-bisaryltetrahydrofuran lignans, reveals that the molecule adopts an αββα configuration. The tetrahydrofuran ring is in an intermediate conformation between half-chair and envelope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195012054
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical-plate concept in chromatography (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 477-481 
    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: The theoretical-plate concept in chromatography has been treated on the basis of continuous flow of eluent through the plates of the column. A treatment more precise in principle than the previous treatments is presented. General elution and deposition equations have been derived and applied to special cases of practical interest. The derived formulas have the advantage of precision, generality, and simplicity.The theory was found adaptable to the treatment of gradient elution and also to the calculation of the fraction of solute which has been eluted or still-adsorbed on the column during the elution process.A method for the determination of the number of theoretical plates in a chromatographic column is also described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020412
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  • 7
    Electronic Resource
    Electronic Resource
    Catalytic dehydrogenation of ethylbenzene to styrene in membrane reactors (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 2055-2059 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690401215
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical plate concept in chromatography: Part II (1959)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 5 (1959), S. 69-72 
    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: Part A of this paper is essentially a continuation of a previous paper on the theoretical plate concept in chromatography (4). It deals with some special cases of eluting conditions and zone shapes. A more general equation, which combines both elution and deposition, is derived, and methods for approximating a continuous zone by means of a discontinuous one are discussed.Part B discusses the effect of the finite size of samples and the dead free volume at the bottom of the column on the shape of elution curves. The effect of representative sample volumes is calculated, and the deviation between the experimental and the true elution curves is illustrated.A simple expression for the number of theoretical plates utilizing the ratio between the maximum concentrations at the top and bottom of the column is derived and corrected for the effect of the finite size of samples.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690050115
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  • 9
    Electronic Resource
    Electronic Resource
    Chromatographic columns containing a large number of theoretical plates (1959)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 5 (1959), S. 223-224 
    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: To obtain numerical answers for the concentration distribution of solute on a chromatographic column or in the effluent, tables and charts of the Poisson distribution are used. Their use however is limited to a small number of theoretical plates. The transformation of the Poisson to the normal distribution enables the calculations to be performed for any number of theoretical plates through the use of the normal distribution tables.Equations derived previously for columns containing a large number of plates and employing elaborate mathematical procedures and approximations have been simply deduced by applying a limit property of the Poisson distribution to the exact equations.A relationship between the Poisson and normal distribution is derived, and charts are drawn which allow the rapid evaluation of the Poisson in terms of the normal values.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690050218
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  • 10
    Electronic Resource
    Electronic Resource
    Some properties of the poisson distribution (1958)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 4 (1958), S. 290-292 
    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: This paper lists various properties of the Poisson distribution and related functions which can be derived from elementary principles without reference to theories of probability or statistics. They are intended for use by persons who may have to deal with Poisson distributed variables but not from a satistical point of view. Limit values and sums of the Poisson distribution, the sums of related functions, and different relations between its sums and integrals are given.Differential and difference equations which lead to solutions in the form of a Poisson distribution are discussed. The general elution equation is derived by setting up the differential-difference equation for plate n in a chromatographic column and showing that the Poisson distribution is a solution to this equation. The complete solution is then obtained by applying the boundary conditions of the process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690040311
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