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  • Inorganic Chemistry  (7,119)
  • Life and Medical Sciences  (6,946)
  • Organic Chemistry  (6,825)
  • LUNAR AND PLANETARY EXPLORATION  (3,085)
  • 2015-2019  (33)
  • 1985-1989  (16,281)
  • 1960-1964  (7,661)
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  • 1
    Electronic Resource
    Electronic Resource
    New data on the structure and the growth of the osteoderms in the reptile Anguis fragilis L. (Anguidae, Squamata) (1985)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 186 (1985), S. 327-342 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Light and electron microscopy shows the osteoderms of Anguis fragilis to be small, flat disks located in the dermis along the adult trunk: microradiography established the extent of the mineralization.Each osteoderm coincides exactly with an epidermal fold forming the keratinized scales characteristic of the skin of reptiles.Sections perpendicular to the surface show two mineralized layers differing in histological and histochemical characteristics and in fine structure, although both contain collagen fibrils. The structure of each layer can be related to that of the surrounding dermis.The outer superficial layer located in the loose dermis contains few collagen bundles that form a discontinuous sheet at the upper surface of the osteoderms. This superficial layer appears to be constituted of units separated by furrows and is composed of woven fibered bone.The basal plate comprises stratified lamellae formed of parallel-oriented collagen fibrils; the fibrils of successive lamellae lie at right angles. The densely packed collagen fibrils of the basal plate are distributed similarly to those of the dense dermis within which it lies. This layer exhibits structural and histochemical characteristics of a lamellar bone.The presence of two different layers in the osteoderms of Anguis fragilis may reflect their mode of formation, which consists of the deposit of mineral crystals in the preexisting dermal tissue. This mineralization process, considered as a “metaplastic ossification,” may reflect the potentiality retained by the dermis of reptiles to form mineralized structures.
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051860309
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Thermische Umsetzung von Mono-n-alkylbenzenen (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 824-832 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal Reaction of Mono-n-alkyl-benzenesThe pyrolysis of ethyl-(1), n-propyl-(2), n-hexyl-(3) and n-octylbenzene (4) has been studied under conditions of steam cracking (600 to 800°C) in a laboratory scale tubular reactor. The overall activation energies determined for (1) to (4) were found to be nearly identical (221 to 227 kJ · mol-1) obviously caused by similar initial steps. The main liquid product observed was styren accompanied by ω-phenyl-1-alkenes and α-olefins. Benzene is an important side product of 1. It might be formed mainly by a hydrogen assisted dealkylation via a cyclohexadienyl type radical as reactive intermediate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290511
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  • 3
    Electronic Resource
    Electronic Resource
    Über einige physikalisch-chemische Eigenschaften wässeriger Systeme. Natrium Alkylsulfat/P-ToluidinhydrochloridHerrn Prof. Dr. H. Bertsch zum 65. Geburtstage gewidmet (1962)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 15 (1962), S. 216-222 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Im Zusammenhang mit der früher bearbeiteten konduktometrischen Titration oberflächenaktiver Substanzen mit p-Toluidinhydrochlorid wurde die physikalisch-chemische Analyse des Systems Alkylsulfat/p-Toluidinhydrochlorid durch Bestimmung der Leitfähigkeit, Viskosität und deren Abweichungen von der Addierbarkeit durchgeführt. Auf Grund dieser Ergebnisse wurden die untersuchten Systeme als „irrationelle“ angenommen, was bedeutet, daß die charakteristischen Punkte, also die Extrema auf den Kurven der physikalisch-chemischen Eigenschaften  -  Zusammensetzung des Systems, einer stöchiometrischen Zusammensetzung der in der Lösung sich bildenden Verbindungen nicht entsprechen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19620150309
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  • 4
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    Energetic ions upstream of Jupiter's bow shock (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In an analysis of the Jovian ion events, Baker et al. (1984) have found that there appears to be a spectral hardening as the interplanetary magnetic field (IMF) changed orientation from the postnoon to a prenoon connection point. It was also observed that ion events were accompanied by long-period (approximately 10 min) waves whose presence was weakly related to a decrease in the ion anisotropy. The present investigation examines in substantial detail the development of the ion energy spectrum over the full range (approximately 30 keV to approximately 4 MeV). The results of the investigation show that the energy spectra are dominated by heavy ions (presumed to be oxygen and sulfur) at higher (approximately equal to or greater than 300 keV) energies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 3947-396
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Remote Tricarbonyl(diene)iron Substituent Effect on Ester Heterolysis. The Solvolyses of 5,6,7,8-Tetramethylidenebicyclo[2.2.2]oct-2-yl Methanesulfonate and of its Tricarbonyliron Mono- and Dinuclear ComplexesPart of Ph.D. thesis of J.-C. Zwick, Ecole Polytechnique Fédérale de Lausanne, 1987. Part of this work has been presented at the Fall Meeting of the Swiss Chemical Society in Bern, Oct. 10, 1986. (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 1079-1094 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Buffered acetolyses and hydrolyses of 5,6,7,8-tetramethylidenbicyclo[2.2.2]oct-2-yl methanesulfonate (17), of its ‘syn-endo’ (18), ‘syn-exo’ (19), ‘anti-endo’ (20), ‘anti-exo’ (21) tricarbonyliron complexes and of its ‘anti-exo,syn-endo’ (22) and ‘anti-endo,syn-exo’ (23) bis(tricarbonyliron) dinuclear complexes have been investigated (product analysis and kinetics). In contract with the solvolyses of the uncomplexed mesylate 17, the solvolyses of the complexed esters can be highly chemo- and stereoselective. The nature of the products (non-rearranged bicyclo[2.2.2]oct-2yl vs. rearranged bicyclo[3.2.1]oct-2-yl derivatives) depends on the relative configuration of the tricarbonyl(diene)iron moieties and on the medium. The rates of solvolyses of 17 are only slightly affected by complexation of one or both s-cis-butadiene units with Fe(CO)3 groups, except in the cases where the diene moiety ‘anti’ with respect to the mesylate is complexed onto its ‘endo’ face (20,23). In these cases, significant rate-retardation effects are observed, consistent with the inductive effect of the Fe(CO)3 substituent. Such retardation effects are overwhelmed by competing accelerating homoallylic participation by uncoordinated ‘anti’ -diene moieties (18,19) or, as in the case of the ‘anti-exo’-Fe(CO)3 complexes 21 and 22, by possible direct metal participation to the ionization process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700421
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  • 6
    Electronic Resource
    Electronic Resource
    Control of Diels-Alder Addition, Stereo- and Regioselectivity by Remote Substituents and Tricarbonyl(diene)iron MoietiesPart of the Ph. D. thesis of J.-C. Zwick, Ecole Polytechnique Fédérale de Lausanne, 1987. Part of this work has been presented at the fall meeting of the Swiss Chemical Society in Bern, Oct.10, 1986. (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 1231-1249 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A stereoselective synthesis of tricarbonyl-[((1RS,2RS,4RS,5RS,6RS)-C-5,6,C-η-(5,6,7,8,-tetramethylidenbicyclo[2.2.2]octan-2-ol)]iron (11),and of its tosylate 12 and benzoate 13 is reported. The bulk of the ‘endo’-Fe(CO))3 moiety and of the ester groups in 13 renders its Diels-Alder additions to methyl propynoate (15)), butynone (16), and 1-cyanovinyl acetate highly ‘para’ regioselective. The cycloadditions of diene-alcohol 11 are either ‘meta’- or ‘para’-regioselective depending on the nature of the dienophile. In the presence of BF3. Et2O, the addition of 11 to methyl vinyl ketone is highly stereo- (Alder mode) and ‘para’-regioselective, giving adduct 52 (tricarbonyl [((1 RS,4RS,8RS,9RS,10RS,12RS)-C,9,10,C-η-(12-hydroxy-9,10-dimethylidenetricyclo[6.2.2.02,7]dodec-2(7)-en-4 yl methyl ketone)]iron) whose structure has been established by single-crystal X-ray crystallography.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700502
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  • 7
    Electronic Resource
    Electronic Resource
    Enterocytic differentiation of a subpopulation of the human colon tumor cell line HT-29 selected for growth in sugar-free medium and its inhibition by glucose (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 122 (1985), S. 21-29 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In order to study the effect of glucose on the differentiation of cultured human colon cancer cells, a subpopulation of HT-29 cells was selected for its capacity to grow in the total absence of sugar. These cells (GIc-cells) exhibit, after confluency, an enterocytic differentiation, in contrast to cells grown with glucose (Glc+ cells), which always remain undifferentiated. The differentiation is characterized by a polarization of the cell layer with apical brush borders and tight junctions, and by the presence of sucrase-isomaltase. The differentiation of Glc-cells is reversible: the addition of glucose to postcon-fluent cultures of Glc- cells results in an inhibiting effect on the expression of sucrase-isomaltase; switching growing cultures of Glc-cells to the Glc+ medium for several passages results in a progressive reversion to the undifferentiated state, which is completed after seven passages. The dedifferentiation process is associated with a parallel, passage-related, increase in the rates of glucose consumption and lactic acid production, and decreases of intracellular glycogen content, which return to the values of the undifferentiated original Glc+ cells. The values of these metabolic parameters are correlated, at each passage, with the degree of dedifferentiation of the cells. When these dedifferentiated cells, after having been cultured in Glc+ medium for 20 passages, are switched back to the Glc- medium, they readily grow without mortality, and reexpress the same enterocytic differentiation as the parent Glc- cells. These results show that the capacity of this subpopulation to grow and differentiate in the absence of sugar is a stable characteristic. They further suggest that glucose metabolism interferes with the program of differentiation of HT-29 cells.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041220105
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  • 8
    Electronic Resource
    Electronic Resource
    Stability Constants of Cu(II) Complexes with Acid Hydrazides (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 534-538 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290323
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  • 9
    Electronic Resource
    Electronic Resource
    Neutral amino acid transport in embryonal carcinoma cells (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 122 (1985), S. 379-386 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Neutral amino acid transport was characterized in the pluripotent embryonal carcinoma (EC) cell line, OC15. Ten of the thirteen amino acids tested are transported by all three of the major neutral amino acid transport systems - A, L, and ASC - although one system may make a barely measurable contribution in some cases. The characterization of N-methyl-aminoisobutyric acid (meAIB) transport points to this model amino acid as a definitive substrate for System A transport by OC15 cells. Thus, high concentrations of meAIB can be used selectively to block System A transport, and the transport characteristics of meAIB represent system A transport. Kinetic analysis of System A, with a Km = 0.79mM and Vmax = 14.4 nmol/mg protein/5 min, suggests a single-component transport system, which is sensitive to pH changes. While proline transport in most mammalian cells is largely accomplished through System A, it is about equally divided between Systems A and ASC in OC15 cells, and System A does not contribute at all to proline transport by F9 cells, an EC cell line with limited developmental potential. Kinetic analysis of System L transport, represented by Na+-independent leucine transport, reveals a high-affinity, single-component system. This transport system is relatively insensitive to pH changes and has a Km = 0.0031 mM and Vmax = 0.213 nmol/mg protein/min. The putative System L substrate, 2-aminobicyclo-[2,2,1]heptane-2-carboxylic acid (BCH), inhibits Systems A and ASC as well as System L in OC15 cells. Therefore, BCH cannot be used as a definitive substrate for System L in OC15 cells. Phenyialanine is primarily transported by Na+ -dependent Systems A and ASC (83% Na+-dependent; 73% System ASC) in OC15 cells, while it is transported primarily by the Na+-independent System L in most other cell types, including early cleavage stage mouse embryos and F9 cells. We have also found this unusually strong Na+-dependency of phenyl-alanine transport in mouse uterine blastocysts (82% Na+-dependent). There is no evidence for System N transport by OC15 cells, since histidine is transported primarily by a Na+-independent, BCH-inhibitable mechanism.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041220307
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  • 10
    Electronic Resource
    Electronic Resource
    Lectin-induced blockage of developmental processes in preimplantation mouse embryos in vitro (1985)
    New York, NY : Wiley-Blackwell
    Gamete Research 12 (1985), S. 275-290 
    Details
    ISSN: 0148-7280
    Keywords: lectins ; preimplantation mouse embryos ; glycoconjugates ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: This study attempts to assess the developmental importance of cell surface glycoconjugates of preimplantation mouse embryos. This was done by incubating early embryos in various lectins and analyzing subsequent development. If specific cell surface glycoconjugates (lectin receptors) are linked to specific developmental processes, such as cell division, compaction, and blastocyst formation, then different lectins should block these different developmental processes. The results show that wheat-germ agglutinin (WGA; N-acetyl-D-glucosamine-specific) at 50 μg/ml prevents the cell division of four-cell embryos. However, this effect of WGA occurs only in embryos with intact zonae pellucidae. Concanavalin A (Con A; α-D-glucose and α-D-mannose-specific) treatment, 20 μg/ml, of four-cell or early eight-cell embryos prevents compaction, the first major change in cell shape in early mouse embryogenesis. Divalent succinly Con A does not affect development, suggesting that the Con A effect is due to crosslinking of cell surface glycoconjugates. Exposure of four-cell or early eight-cell embryos to 10 μg/ml Lotus Tetragonolobus puprureas agglutinin (LTA; α-L-fucose-specific) or 25 μg/ml Limulus polyphemus agglutinin (LPA; sialic acid-specific) allows compaction or development to the morula stage, but blocks blastocyst formation. All lectins tested retard cell division to some extent. Late morulae and early blastocysts are more resistant than earlier stages to all of the lectins studied. This study demonstrates that very low concentrations of these lectins affect different developmental processes, presumably based upon their sugar specificities.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120120306
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