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  • 1990-1994  (9)
  • 1975-1979  (11)
  • 1905-1909  (3)
  • Chemistry  (15)
  • Life and Medical Sciences  (6)
  • Allelopathy
  • Biochemistry and Biotechnology
  • synergism
  • 11
    Electronic Resource
    Electronic Resource
    Successful maintenance of suckling rat ileum in organ culture (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 155 (1979), S. 375-389 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Ileum from rats 4, 9, 11, 12, and 15 days old can best be maintained for 24 hours in a system using Hanks' Balanced Salt Solution without fetal calf serum, at 25°C and 21% O2. Suckling rat duodenum and jejunum were difficult to maintain well for 24 hours in this system or a variety of other systems that were tried. A temperature of 37°C hastened deterioration of duodenum, jejunum or ileum. With ileum, 3H-thymidine and 14C-leucine were increasingly incorporated into DNA and protein over the 24-hour period. Light microscopy, as well as scanning and transmission electron microscopy, showed very good preservation of the ileum after 24 hours. The addition to the medium of hydrocortisone, 1 μm, and thyroxine, 0.01 μm, alone or in combination, did not change DNA or protein synthesis, or morphology, possibly because of the relatively short (24 hour) time period. Our organ culture system emphasizes the differences between suckling rat ileum and the rest of the intestine, and provides a new tool for evaluating, over a 24-hour period, the developing rat small intestine.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001550307
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  • 12
    Electronic Resource
    Electronic Resource
    The influence of collisional cooling on boundary-activated decomposition in an ion-trap mass spectrometer (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 929-934 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: When the working point of a precursor ion confined within a quadrupole ion trap is moved to the vicinity of a boundary of the stability diagram, fragmentation of the precursor ion can be induced by virtue of energy gained from the radio-frequency trapping field. This behaviour is known as the ‘border effect’. When the isolated precursor ion is subjected to a cooling period of variable duration, in the presence of helium buffer gas and prior to experiencing the ‘border effect’, a high degree of control of the fragmentation pattern is achieved. The cooling period causes decreases in both ion kinetic energy and ion axial excursions. From this preliminary study, it is suggested that the deposition of internal energy during the ‘border effect’ can be varied by changing the duration of the cooling period. In addition to a degree of control of internal energy deposition, the amount of energy which can be deposited in this manner, though unknown, appears to exceed those energy levels achievable with resonance excitation and the ‘border effect’ without collisional cooling, in that an additional fragmentation channel is accessed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071014
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  • 13
    Electronic Resource
    Electronic Resource
    Enhanced mass resolution in a quadrupole ion trap (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 43-45 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The versatility of the quadrupole ion trap as a mass spectrometer in which the mass resolution may be varied over a wide range has been demonstrated. Mass resolution of 0.8 × 107 and 1.2 × 107 have been obtained for ions of m/z 414 and m/z 614, respectively, well in excess of the normal value of 3m, where m is the mass of ion. At the highest mass resolution, peak-widths at half-maximum are but 52 × 10-6 u. While it has been shown previously that enhanced mass reslution in the quadrupole ion trap can be achieved by reduction of the mass scanning rate, the range of mass resolutions reported here were achieved by reducing the mass scanning rate, in stages, by an overall factor of ca 5.5 × 104.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070111
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  • 14
    Electronic Resource
    Electronic Resource
    A contribution to the anatomy and development of the venous system of chelonia (1905)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 4 (1905), S. 453-485 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1000040406
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  • 15
    Electronic Resource
    Electronic Resource
    A dynamic nuclear magnetic resonance study of nitrogen inversion in N,N'-dimethylimidazolidine (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 362-364 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 251 MHz 1H and the natural-abundance 63.1 MHz 13C NMR spectra of N,N'-dimethylimidazolidine have been measured from -50 to -170°C. Below about -140°C. nitrogen inversion in the compound becomes slow on the NMR time scale and both the 1H and the 13C spectra indicate that it exists in solution as a mixture of cis and trans conformations having nearly the same energies. The free-energy barrier (ΔG≠) for nitrogen inversion in N,N'-dimethylimidazolidine is 6.4 kcal mol-1, a value which is 1.5 kcal mol-1 lower than that for N-methylpyrrolidine.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120607
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  • 16
    Electronic Resource
    Electronic Resource
    13C n.m.r. chemical shifts of carbodiimides (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 327-328 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C n.m.r. chemical shifts of the sp-hybridized carbons in dialkylcarbodiimides have values of δc ≃ 140. These shifts are compared with those of similarly hybridized carbons occuring in other classes of compounds.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080613
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  • 17
    Electronic Resource
    Electronic Resource
    Carbon-13 nuclear magnetic resonance spectra and conformations of cis,cis-1,5-cyclooctadiene monoepoxide and cis, syn,cis-1,5-cyclooctadiene diepoxide (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 299-301 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The natural-abundance 13C NMR spectra of cis,cis-1,5-cyclooctadiene monoepoxide and cis,syn,cis-1,5-cyclooctadiene diepoxide have been investigated over the temperature range of - 10 to - 180°C. Whereas the spectra of the former showed no dynamic NMR effect, two different conformations in the ratio of 3:1 were observed at low temperatures for the latter. The free-energy barrier (ΔG≠) for conversion of the major conformation to the minor conformation is calculated to be 5.9°0.2 kcal mol-1 from a line-shape analysis of spectra obtained at intermediate temperatures. It is shown that cis,syn,cis-1,5-cyclooctadiene diepoxide exists in solution in chair (major) and in twist-boat (minor) conformations of slightly different energies. Interconversion paths between these conformations are discussed. The monoepoxide is suggested to have a twist-boat conformation that is rapidly pseudorotating via a boat conformation even at - 180°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120510
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  • 18
    Electronic Resource
    Electronic Resource
    Lectin binding to gp60 decreases specific albumin binding and transport in pulmonary artery endothelial monolayers (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 149 (1991), S. 575-584 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effect of albumin binding to cultured bovine pulmonary artery endothelial cell (BPAEC) monolayers on the transendothelial flux of 125I-labelled bovine serum albumin (BSA) was examined to determine its possible role on albumin transcy-tosis. The transport of 125I-BSA tracer across BPAEC grown on gelatin- and fibronectin-coated filters (0.8 μm pore diam.) was affected by the presence of unlabelled BSA in the medium in that transendothelial 125I-BSA permeability decreased, reaching a 40% reduction at BSA concentrations equal to or greater than 5 mg/ml. BSA binding to BPAEC monolayers was saturated at concentration of 10 mg/ml with an apparent binding affinity of 6 x 10-7 M. In contrast, gelatin added to the medium altered neither 125I-BSA binding nor transport. Several lectins were tested for their ability to inhibit 125I-BSA binding and transport. One lectin, Ricinus communis (RCA), reduced 125I-BSA binding by 70% and transport by 40%. Other lectins, Ulex europaeus, Triticum vulgare, and Glycine max decreased neither 125I-BSA binding nor transport. The reduction of 125I-BSA transport by RCA was not observed in the presence of saturating levels of BSA, indicating that RCA influenced only the albumin-dependent component of transport. RCA, but not other lectins, precipitated a 60 kDa plasmalemmal glycoprotein from cell lysates of surface radioiodinated BPAEC monolayers. This 60 kDa glycoprotein appears to be the equivalent of gp60 identified previously as an albumin binding glycoprotein in rat microvascular endothelium. In summary, approximately 40% of albumin transport across' BPAEC monolayers is dependent on albumin binding. This component of albumin transport is inhibited by 80% by the binding of RCA to gp60. These results suggest that binding of albumin to gp60 on pulmonary artery endothelial cell membrane is a critical determinant of transendothelial albumin flux involving mechanisms such as plasmalemmal vesicular transcytosis.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041490329
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  • 19
    Electronic Resource
    Electronic Resource
    Über Gewinnung von schwefelsaurem Ammonium und von Kraftgas aus TorfVortrag, gehalten in der Fachgruppe für anorganische Großindustrie des Vereins deutscher Chemiker, Hauptversammlung Jena, 12./6. 1908. (1908)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 21 (1908), S. 1597-1600 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19080213003
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  • 20
    Electronic Resource
    Electronic Resource
    Effect of the orientation of an α-substituent on vicinal 13C-;1H spin-spin coupling constants (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 68-74 
    Details
    ISSN: 0749-1581
    Keywords: Theoretical calculation of 13C-1H spin-spin couplings ; Propanes ; Calculated 13C-1H coupling constants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The magnitude of the NMR spin-spin coupling constant, 3J(CH), between a vicinal 13C-1H pair depends, inter alia, on the value of the torsion angle ΦCH(13C—C—C—H) and is influenced by the presence of an electronegative substituent located on the coupling 13C nucleus. The form and magnitude of the effect of the orientation ΨXC of such an α-substituent were examined. The coupling constant between C-1 and a hydrogen atom located on C-3 in a series of α-substituted propanes were studied by means of the semi-empirical INDO method. In the calculations both Φ and Ψ(X—13C—C—C) were systematically varied in steps of 30°. These calculations reveal that the variation of Ψ at a constant Φ has a pronounced effect on the calculated coupling constant Jcalc. The magnitude of this effect is shown to be strongly dependent on the electronegativity χ of the α-substituent. Thus, it is shown that Jcalc depends on Φ and Ψ, in addition to χ. The resulting set of two-dimensional Karplus-type surfaces can be described by an equation that contains only nine adjustable parameters. Measurement of 3J(CH) in cis- and trans-2,2,6,6-tetradeuterio-4-tert-butylcyclohexanol confirmed some of the theoretical predictions. In the cis compound (ΦCH = 180°, ΨOC = 60°) 3J(C-1,H-3eq) is 7.1 Hz, whereas in the trans compound (ΦCH = 180°, ΨOC = 180°) 3J(CH) equals 10.4 Hz, in qualitative agreement with the INDO calculations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280113
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