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  • Articles  (106)
  • Life and Medical Sciences  (54)
  • Inorganic Chemistry  (52)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE
  • ASTROPHYSICS
  • Aircraft Stability and Control
  • Lunar and Planetary Science and Exploration
  • MATERIALS, METALLIC
  • 2005-2009
  • 1975-1979  (65)
  • 1970-1974  (41)
  • 1925-1929
  • 1977  (65)
  • 1974  (41)
  • 1953
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  • 2005-2009
  • 1975-1979  (65)
  • 1970-1974  (41)
  • 1925-1929
  • 1950-1954  (20)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Mechanics of the syrinx in Gallus gallus. II. Electromyographic studies of Ad Libitum vocalizations (1977)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 152 (1977), S. 1-19 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Records of electrical activity in the tracheal muscles of domestic chickens were obtained for a variety of ad libitum vocalizations. Primary attention was given to an analysis of events during the most complex call, crowing.Three pairs of muscles, Mm. tracheohyoideus, tracheolateralis, and sternotrachealis, can affect the configuration of a chicken's syrinx. The firing patterns of the three muscle pairs are related to their different abilities to affect the tension of the syringeal membranes. The influence of M. tracheohyoideus is most indirect and imprecise, and its role the least clearly defined. It appears to adjust the position of the trachea so that the syrinx is isolated from unpredictable and/or undesirable consequences of nuchal position and tracheal elasticity, and also helps draw the glottis caudad, thereby deepening the pharyngeal chamber. The other two muscles interact to control the tension of the vocal membranes. M. sternotrachealis relaxes the membranes by drawing the drum of the trachea caudad, or, via the syringeal ligament, by rotating the pessulus cranioventrad, or both. M. tracheolateralis tenses the membranes and/or prevents caudal movement of the origin of M. sternotrachealis, a necessity if the syringeal ligament is to rotate the pessulus.Vocalization depends on both syringeal configuration and appropriate air flow. Hence, tracheal muscles, syrinx, air sacs, and ventilatory muscles cooperate to form a vocal system. Cooperation elicits a surprising degree of redundancy. At least one call, a high pitched wail, may be produced by two very different techniques.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051520102
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  • 2
    Electronic Resource
    Electronic Resource
    Glycolytic enzyme activity in developing red and white muscle (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 83 (1974), S. 251-257 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The activities of the constant proportion enzymes of the Embden-Meyerhof chain (triose phosphate isomerase (TIM), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), phosphoglycerate kinase (PGK), phosphoglycerate mutase (PGM) and enolase (ENOL)), and the activity of lactic dehydrogenase (LDH) were studied in developing red (trapezius) and white (longissimus) muscles of the pig from a fetal stage to 24 weeks postnatal. Both muscles were differentiated by two weeks postnatal in the sense that they had reached the adult level of enzyme activity. Enzyme activities were two- to three-fold greater in the longissimus than in the trapezius. Enzyme activity ratios based on GAPDH were not consistent in the fetal and day 1 samples but were consistent during later stages of growth. Ratios of enzyme activity based on activity at 105 days gestation revealed that TIM, PGK and PGM are grouped and follow the same pattern, but GAPDH and ENOL are quite different from each other and from the pattern shown by TIM, PGK and PGM. The constant proportion concept in developing muscle is therefore questioned.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040830211
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  • 3
    Electronic Resource
    Electronic Resource
    Cell cycle dependent modulations of the surface membrane of normal and SV40 virus transformed 3T3 cells (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 84 (1974), S. 343-348 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Agglutinability with Concanavalin was studied as function of cell cycle transition in normal and SV40 virus transformed 3T3 cells. In synchronized cultures of normal cells, agglutinbility was high during mitosis and disappeared rapidly. Agglutinability of transformed cells remained high in G1 phase but diminished gradually upon entering S phase and reached minimum in G1 phase. Decreased agglutinability a the end of the cell cycle was also observed in synchronous SV3T3 cultures by a combined technique of haemadsorption and density gradient centrifugation. In normal 3T3 cells, similar variations in agglutin ability during interphase could not be observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040840303
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  • 4
    Electronic Resource
    Electronic Resource
    Colloidal iron hydroxide-binding to the surfaces of chick embryo fibroblasts transformed by wild-type and a temperature-sensitive mutant of Rous sarcoma virus (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 91 (1977), S. 329-334 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The densities of colloidal iron hydroxide (CIH) particles binding to the surfaces of chick embryo fibroblasts were determined before and after transformation with wild type Rous sarcoma virus and a temperature sensitive (ts) mutant of this virus. On the basis of in vitro behavior, cells transformed by the ts virus manifest a malignant phenotype at 36°C (permissive temperature) and appear normal at 41°C (non-permissive temperature). At the permissive temperatures there is a significant increase in CIH particle-binding to spaces of cell surface between microvilli on the wild type and ts transformed cells. At the non-permissive temperature this significant increase in binding is only observed on the wild type transformant, while the density found on the ts transformant is not significantly different from the untransformed state. Therefore, in vitro characteristics of normalcy and malignancy are reflected in changes in the CIH binding properties of the cell surface spaces between microvilli.The CIH densities observed on the microvilli are significantly different from the density on the spaces between them for each of the classes of cells studied at either temperature. The microvilli are found to bind a lower density of particles in five of the six cases. No correlations between microvilli particle density and transformation to in vitro malignant characteristics were observed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040910302
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Katalyse der Ammoniaksynthese und des Stickstoffisotopenaustausches durch Schichtverbindungen von Graphit mit Eisen, Ruthenium und Osmium (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 428 (1977), S. 231-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Catalysis of Ammonia Synthesis and Nitrogen Isotope Exchange by Lamellar Compounds of Graphite with Iron, Ruthenium, and OsmiumThe catalytic activity of transition metal potassium-graphite lamellar compounds for the synthesis of ammonia from the elements and the catalysis of the equilibration by isotope exchange of the isotopic nitrogen molecules are shown to correlate. Connections between the state of metal in the catalyst exist with iron as metal which is shown by Mössbauer spectroscopy and the catalytic activity in relation to the potassium content.
    Notes: Die katalytische Aktivität von Übergangsmetall-Kalium-Graphitverbindungen bei der Synthese von Ammoniak aus den Elementen und bei der Einstellung des Isotopenaustauschgleichgewichts der isotopen Stickstoffmolekeln korrelieren miteinander. Im Falle von Eisen als Metall sind Beziehungen zwischen dem durch Mößbauer-Spektroskopie ermittelten Zustand des Metalls im Katalysator und der katalytischen Aktivität in Abhängigkeit vom Kaliumgehalt erkennbar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774280129
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  • 6
    Electronic Resource
    Electronic Resource
    Reactions between Triethyl Phosphate and Metal HalidesVorbericht: Z. anorg. allg. Chem. 401, 313 (1973). Part of this work appeared in the Proceedings of the XIVth International Conference on Coordination Chemistry, pp. 283-285, Toronto Canada, June 22-28, 1972; abstracted from the Ph. D. thesis of C. M. Mikulski, Drexel University, Department of Chemistry, 1972. (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 200-210 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktionen von Triäthylphosphat mit MetallhalogenidenTriäthylphosphat reagiert mit M(I), M(II) oder M(III) Halogeniden bei 100-250°C unter Bildung folgender Komplexe: M[OOP(OC2H5)2]3, (M = Al, Ga, In, Sc, Y, Dy, Ti, V, Cr, Fe); M[OOP(OC2H5)2]2, (M = Fe, Cu); VO[OOP(OC2H5)2]2; Li[OOP(OC2H5)2]; M2[OOP(OC2H5)2]2 [OOP(OC2H5)—O—P(OC2H5)OO], (M = Mn, Co, Ni); und M3HP2O7 (M = Rb, Cs). Diese Komplexe wurden mittels Infrarot- und Elektronen-Spektren und magnetischer Messungen charakterisiert.
    Notes: Triethyl phosphate reacts with M(I), M(II) or M(III) halides at 100-250°C with formation of the following complexes: M[OOP(OC2H5)2]3, (M = Al, Ga, In, Sc, Y, Dy, Ti, V, Cr, Fe); M[OOP(OC2H5)2]2, (M = Fe, Cu); VO[OOP(OC2H5)2]2; Li[OOP(OC2H5)2]; M2[OOP(OC2H5)2]2 [OOP(OC2H5)—O—P(OC2H5)OO], (M = Mn, Co, Ni); and M3HP2O7 (M = Rb, Cs). These complexes were characterized by means of their infrared and electronic spectra and magnetic susceptibilities.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030216
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  • 7
    Electronic Resource
    Electronic Resource
    Eine neue Synthese für Tetracyclo[3.3.0.02,8.04,6]octan-3-one durch intramolekulare [2π + 2 σ]-Thermocycloaddition (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 680-685 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Synthesis of Tetracyclo[3.3.0.02.8.04.6]octan-3-ones by Intramolecular Thermal [2π + 2σ]-CycloadditionThe synthesis of the tetracyclooctanone 19 by thermolysis of the tricyclic acetal 15 and subsequent removal of the acetal group is described. Thus, a third synthetic access to this system is now available. The reaction involves the cycloaddition of a thermally ring-opened cyclopropane to a double bond.
    Notes: Die Synthese des Tetracyclooctanons 19 durch Thermolyse des tricyclischen Acetals 15 und anschließende Entacetalisierung wird beschrieben. Damit bietet sich ein dritter synthetischer Zugang zu diesem System an. Die Reaktion beinhaltet die Cycloaddition eines thermisch ringgeöffneten Cyclopropans an eine Doppelbindung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070240
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  • 8
    Electronic Resource
    Electronic Resource
    Di-μ-hydrido-bis[1,3-propanbis(dicyclohexylphosphin)]dinickel(Ni—Ni)  -  Der Bindungszustand in einem Dreizentren-Wasserstoff-überbrückten Ni—Ni-System (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3900-3909 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Di-p-hydrido-bis[1,3-propanbis(dicyclohexylphosphin)]dinickel(Ni—Ni) - Der Bindungszustand in einem Dreizentren-Wasserstoff-überbrückten Ni—Ni-SystemDie Kristallstruktur der Titelverbindung [(C6H11)2PCH2CH2CH2P(C6H11)2NiH]2 (1) wurde aus 4051 Reflexen abgeleitet und zu einem R-Wert von 0.044 verfeinert. Lageparameter aller Wasserstoffatome konnten einer Differenz-Fourier-Synthese entnommen werden. Die Struktur der diamagnetischen Verbindung setzt sich aus zwei P2Ni-Untereinheiten zusammen, welche zweifach mit Wasserstoffatomen (Ni—H 1.6 Å) überbrückt sind. Hierdurch ergibt sich ein bindender Ni—Ni-Abstand von 2.441(1) Å. Im Kristallgitter bilden die Ebenen durch die P2Ni-Untereinheiten einen Interplanarwinkel von 63.3°. Theoretische Betrachtungen sagen für das freie Molekül eine quadratisch planare Anordnung voraus, doch ergibt sich für die Drehbewegung zur beobachteten Geometrie nur eine flache Potentialenergiefläche. Die gefundene Verdrillung resultiert aus starken intramolekularen Abstoßungskräften zwischen den Cyclohexylgruppen der zwei P2Ni-Einheiten.
    Notes: The crystal structure of the title compound, [(C6H11)2PCH2CH2CH2P(C6H11)2NiH]2 (1), has been determined from 4051 reflections and refined to a final R-value of 0.044. The positions of the hydrogen atoms (bridging and non-bridging) have been determined from a difference Fourier synthesis. The molecular structure of the diamagnetic compound consists of subunits doubly-bridged by hydrogen atoms. The Ni—Ni and average Ni—H distances are 2.441 and 1.6 Å, respectively. In the solid state the two planes of the P2Ni units form a dihedral angle of 63.3°. Theoretical considerations predict a square-planar structure for the idealized molecule with a soft potential energy surface for a twisting motion towards the observed geometry. The observed twist is the result of severe intramolecular repulsions between the cyclohexyl groups of the two P2Ni units.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101221
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  • 9
    Electronic Resource
    Electronic Resource
    Carboxoniumverbindungen in der Kohlenhydratchemie, XXI. Umlagerungsreaktionen bei Einwirkung von Trifluormethansulfonsäure auf 1,6-Anhydro-β-D-galactopyranose-und 1,6-Anhydro-β-D-gulopyranose-triacetate (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 937-950 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carboxonium compounds in Carbohydrate chemistry, XXI. Rearrangement Reactions of 1,6-Anhydro-β-Dgalactopyranose and 1,6-Anhydro-β-Dgulopyranose Triacetates by the Action of Trifluoromethanesulfonic AcidTri-O-acetyl-1,6-anhydro-β-D-galactopyranose (1) affords with trifluoromethanesulfonic acid (TFMS) in a cis-reaction the gulo-ion 3 and in a trans-reaction the talo-ion 4. In addition, the 1,6-anhydrotalofuranose-ion 8 and 1,5-anhydrotalofuranose-ion 9 are obtained as ringcontraction products in considerable amounts. The ring-contraction reactions proceed with retention of configuration. In contrast, the ring transformations between 3-acetoxy-tetrahydropyran (16) and tetrahydrofurfuryl acetate (17) in the presence of TFMS occur with inversion. Tri-O-acetyl-1,6-anhydro-β-D-gulopyranose (27) affords in the presence of TFMS in a cis-reaction predominantly the gulo-ion 3. 1 reacts with TFMS to form the isomerized triacetates 527, 27 and 30 with gulo- and ido-configuration respectively.
    Notes: Tri-O-acetyl-1,6-anhydro-β-D-galactopyranose (1) ergibt mit Trifluormethansulfonsäure (TFMS) in einer cis-Reaktion dasgulo-Ion 3 und in einer trans-Reaktion das talo-Ion 4. Ferner werden in erheblichem Maße als Ringkontraktionsprodukte das 1,6-Anhydrotalo-furanose-Ion 8 und das Anhydrotalofuranose-Ion9 erhalten. Die Ringkontraktions-reaktionen verlaufen stets unter Retention der Konfiguration. Unter Inversion erfolgen dagegen Ringumwandlungen zwischen 3-Acetoxytetrahydropyran (16) und Tetrahydro-furfurylacetat (17) bei Einwirkung von TFMS. Tri-O-acetyl-1,6-anhydro-β-D-gulopyranose (27) liefert bei TFMS-Einwirkung in einercis-Reaktion stark bevorzugt das gulo-Ion 3. Bei der TFMS-Einwirkung auf 1 wurde die Bildung isomerisierter Triacetate der gulo- und ido-Konfiguration 27 und 30 beobachtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070322
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  • 10
    Electronic Resource
    Electronic Resource
    Konformationsanalyse, VII. Tetra-axiale Konformation des Tri-O-benzoyl-β-D-xylopyranosylbromids in Lösung und im Kristall (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2615-2625 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Conformational Analysis, VII. Tetra-axial Conformation of Tri-O-benzoyl-β-Dxylopyranosyl Bromide in Solution and in the Crystalline StateAs a consequence of the dominating influence of the anomeric effect, tri-O-benzoyl-β-D-xylopyranosyl bromide (5) in solution as well as in the solid state adopts the 1C4(D) conformation with four axial groups. A three-dimensional X-ray structural analysis of 5 (rhombic, space group P2 12121) was performed. As a result of a 1,3-syn-diaxial interaction, the bromine atom on C1 is pushed toward the outside of the molecule, and the tetrahydropyran chair is slightly flattened at C1. The 1,3-syn-diaxial interaction of the other two benzoyloxy groups is small. In contrast to pyranoses and pyranosides, the O6—C1-bond in 5 is significantly shortened. Thus, the situation in the pyranosyl halides is comparable to that in 2,3-dihalo-1,4-dioxanes. The implications on the anomeric effect are discussed.
    Notes: Tri-O-benzoyl-β-D-xylopyranosylbromid (5) liegt infolge der dominierenden Wirkung des anomeren Effektes in Lösung und im Kristall in der 1C4(D)-Konformation mit vier axialen Gruppen vor. Eine dreidimensionale Röntgenstrukturanalyse von 5 (rhombisch, Raumgruppe P212121) wurde angefertigt. Der Pyranosesessel ist am C1 leicht abgeflacht, da durch 1,3-syn-diaxiale Wechselwirkung das Brom nach außen gedrängt wird. Die 1,3-syn-diaxiale Wechsel-wirkung zweier O-Benzoylgruppen ist klein. Die O6—C1-Bindung ist im Gegensatz zu allen Pyranosen und Pyranosiden in 5 signifikant verkürzt. Die Verhältnisse bei Pyranosylhalogeniden sind vergleichbar mit denen bei 2,3-Dihalogen-1,4-dioxanen. Die Auswirkungen auf den anomeren Effekt werden diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070822
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