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  • Chemistry  (164)
  • Cell & Developmental Biology  (1)
  • 1965-1969  (165)
  • 1
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 6 (1966), S. 324-332 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This article presents the background and results of the first two-year interval test of a projected 10 or more years field gas service test of various types of plastic pipes. The study is part of a program to establish the suitability of plastic pipes for gas distribution uses. A number of short-term laboratory tests were used to characterize the condition of the pipe after the first two-year exposure period some, like the cursh test, are recognized and accepted methods; others, like the ring-tensile, tensile-impact, and the tear-propagation tests were developed or modified for this stdy. The results show that comparatively little change had taken place in this test period; the possible exception being in the ductility of two kinds of pipe subsequent evaluation should confirm or deny this behavior.
    Additional Material: 28 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 74 (1969), S. 213-216 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Reduction in alkaline phosphatase activity was observed when HeLa S3 cells were grown in Puck's medium containing high concentrations of human serum. This effect was not seen with the enzyme of Chang liver 8A cells. The induction of increased alkaline phosphatase in HeLa S3 by prednisolone or by osmolality changes was not prevented by serum. The concentration of serum in the culture medium had no influence on acid phosphatase activity.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 338 (1965), S. 1-8 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cleavage reactions of the Sn—C and Sn—H bonds in (C2H5)3SnH (I), C2H5SnH3 (II), and (C6H5)3SnH (III) with HBr at -78°C have been investigated. (I) yields (C2H5)3SnBr and H2. (II) reacts with 1 mole HBr forming C2H5SnH2Br (IV) and H2. No further reaction occurs with one additional mole of HBr at -78°C; excess of HBr, However, leads to a very complicated reaction. The white crystalline compound (IV) is stable at -78°C, but decomposes on warming to room temperature: n C2H5SnH2Br → n H2 + (C2H5SnBr)n. (C6H5)3SnH (III) reacts with 1 mole HBr at -78°C yielding (C6H5)2SnHBr (V) and C6H6. (V) decomposes on warming to room temperature giving benzene (no H2) and an insoluble residue with Sn:Br = 1:1. Reaction of (III) with 2 moles HBr leads to C6H5SnHBr2 (VI) which is stable at -78°C. The cleavage of the third Sn-penyl group with an additional mole of HBr does not occur at -78°C. In ether solution, (VI) decomposes forming ½ mole H2 per mole of (VI)
    Notes: Es werden die Spaltungsmöglichkeiten der Sn—C und Sn—H-Gruppe mit HBr in (C2H5)3SnH (I), C2H5SnH3 (II) und (C6H5)3SnH (III) bei - 78°C untersucht. (I) bildet mit HBr (C2H5)3SnBr und H2. -(II) reagiert mit einem Mol HBr nach C2H5SnH3 + HBr = C2H5SnH2Br (IV) + H2. Mit einem weiteren Mol HBr setzt sich (IV) bei -78°C nicht mehr um; mit überschüssigem HBr verläuft die Reaktion unübersichtlich. Das weiße kristalline (IV) ist bei -78°C haltbar, zersetzt sich beim Erwärmen auf Raumtemperatur nach n · C2H5SnH2Br = n · H2 + (C2H5SbBr)n. - (C6G5)3SnH (III) reagiert mit einem Mol HBr bei -78°C nach (C6H5)3SnH + HBr = C6H6 = (C6H5)2SnHBr (V). Dieses (V) zersetzt sich beim Erwärmen auf Raumtemperatur ohne H2-Entwicklung unter Abspaltung von weiterem Benzol und Bildung eines unlöslichen Rückstandes (Sn:Br = 1:1). Die Umsetzung von (III) mit zwei Mol HBr führt zu dem bei -78°C haltbaren C6H5SnHBr2 (VI), Während mit drei Mol HBr eine Abspaltung der letzten Sn-Phenylgruppe bei -78°C nicht mehr gelingt. In Äther erfolgt die Zersetzung von (VI) unter Entwicklung von ½ Mol H2.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 342 (1966), S. 297-306 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN spectrum and the IR spectrum in the range 500-4000 cm-1 of liquid 1,8,10,9-triazaboradecaline were recorded. Major frequencies were assigned by comparing the data with the IR spectra of the corresponding N-dideuterated and 10B-labeled derivatives and by taking into consideration the expected vibrational spectrum of the compound. In accordance with the PMR spectrum, the structure of 1,8,10,9-triazaboradecaline as a bicyclic B-N-C system was confirmed; the bonding situation is discussed briefly.
    Notes: Vom 1,8,10,9-Triazaboradekalin wurde im flüssigen Zustand das RAMAN-Spektrum und das IR-Spektrum von 500-4000 cm-1 aufgenommen. Durch Vergleich mit den IR-Spektren der entsprechenden N-dideuterierten und 10B-markierten Verbindung und Berücksichtigung des Erwartungsspektrums wird eine Zuordnung zu den Grundschwingungen durchgeführt. In Übereinstimmung mit dem 1H-Kernresonanzspektrum wird die Struktur der Verbindung als bicyclisches Bor-Stickstoff-Kohlenstoff-System bestätigt. Die Bindungsverhältnisse werden kurz diskutiert.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 342 (1966), S. 113-120 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Si2C7H16 (I) which is isolated from the products of the pyrolysis of SiMe4 is shown to be 1,1,3,3-tetramethyl-1,3-disilacyclopentene. This result is based on n. m. r. investigations and the reactions of (I) and HBr and Br2.
    Notes: Das aus den Pyrolyseprodukten des Si(CH3)4 isolierte Si2C7H16 wird auf Grund von Umsetzungen mit HBr und Br2 in Verbindung mit NMR-Untersuchungen als 1,1,3,3-Tetramethyl-1,3-Disilacyclopenten identifiziert.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 342 (1966), S. 130-145 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1. By pyrolysis of SiMe4 high boiling silicon compounds are formed which cannot be separated unchanged by distillation. A column chromatographic separation on Al2O3 with benzene and benzene/methanol is described for these compounds. Three groups of substances (A, B, C) are eluated. A can be further separated on an Al2O3 column with pentane and C with benzene/methanol mixtures.2. B contains strongly fluorescent substances which can be characterised (Rf-values) and separated by paper chromatography. These compounds show characteristic absorption and fluorescence bands. This allows a check of the purity of the substances which are separated by paper chromatography.3. Chromatographic investigations have shown that the thermal treatment (i. e. distillation) influences the composition of the pyrolysis mixtures. Above 280°C the proportions of A to B to C are shifted in favour of C. Silicon compounds of higher molecular weight and, finally, compounds which are insoluble in benzene are formed.
    Notes: 1. Für die bei der Pyrolyse des Si(CH3)4 entstehenden und nicht unverändert destillierbaren Siliciumverbindungen wird eine säulenchromatographische Auftrennung an Al2O3 mit Benzol und Benzol-Methanol angegeben, bei der drei Substanzgruppen (A, B, C) zu eluieren sind. A läßt sich an der Al2O3-Säule mit Pentan, C mit Benzol-Methanol-Gemischen weiter auftrennen.2. B enthält stark fluoreszierende Substanzen, die sich papierchromatographisch erfassen (RF-Werte) und abtrennen lassen. Sie besitzen charakteristische Absorptions- und Fluoreszenzspektren, die eine Reinheitskontrolle der papierchromatographisch abgetrennten Substanzen ermöglichen.3. Nach der chromatographischen Untersuchung beeinflußt eine thermische Behandlung (z. B. Destillation) die Zusammensetzung des Pyrolysegemisches. Oberhalb 280°C verschieben sich die Mengenverhältnisse von A:B:C zugunsten von C und es bilden sich noch höhere und schließlich benzolunlösliche Siliciumverbindungen.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 344 (1966), S. 329-336 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The infrared spectrum of 1,3,2-diazaboracyclohexane has been recorded and major absorptions were assigned. The nature of the chemical bonding in 1,3,2-diazaboracycloalkanes is discussed on the basis of spectroscopic data.
    Notes: Das Infrarot-Spektrum von 1,3,2-Diazaboracyclohexan wurde aufgenommen und die Hauptbanden zugeordnet. Die Auswertung spektroskopischer Daten von 1,3,2-Diazaboracycloalkanen erlaubt eine Diskussion der Bindungsverhältnisse der BNC-Heterocyclen.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 353 (1967), S. 34-41 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochlorination of (Cl2Si—CH2)3 or (SiCl3)2CH2 yields (Cl2Si—CCl2)3 or (SiCl3)2CCl2 which react with LiAlH4 to give (H3Si—CCl2)3 (I) or (H3Si)2CCl2 (II)· (II) and (I) tend to rearrange under formation of SiCl and CH bonds. They are the first represenatives of the CCl- and SiH-containing carbosilanes. Their PMR spectra are discussed in connection with their structure.
    Notes: Durch Photochlorierung von (Cl2Si—CH2)3 bzw. (SiCl3)2CH2 werden (Cl2Si—CCl2)3 und (SiCl3)2CCl2 gebildet, aus denen durch Umsetzung mit LiAlH4 (H2Si—CCl2)3 (I) und (SiH3)2CCl2 (II) zugänglich werden. (I) und (II) neigen zu Umlagerungen unter Ausbildung von SiCl- und CH-Gruppen. Sie sind die ersten Vertreter der C-chlorierten, SiH-haltigen Carbosilane. Zur Aufklärung werden die PMR-Spektren herangezogen.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 367 (1969), S. 44-61 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (Cl2Si—CCl2)3 (I) forms with an excess of CH3MgCl the products: (II), (III), (IV), (V), (VI). (II) gives with CH3MgCl (III), with LiAlH4(CH3)3Si—CH2—Si(CH3)2—C≡C—Si(CH3)3. With 6 moles CH3(I) yields (VII). (VII) forms H3Si—Cl2—Si(CH3)2—C≡C—Si(CH3)3 with LiAlH4.(II), (III), (VI) are formed in the reaction of VII with CH3MgCl. The fission of (I) forming the pentacycle (VII) and the cleavage of (VII) to linear products are explained by β-elimination.
    Notes: (Cl2Si—CCl2)3 (I) bildet mit überschüssigem CH3MgCl die Verbindungen (II) reagiert mit CH3MgBr zu (III), mit LiAlH4zu \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm (CH}_{\rm 3})_3 {\rm Si \hbox{---} CH}_{\rm 2} \hbox{---} {\rm Si(CH}_{\rm 3})_2 \hbox{---} {\rm C} \equiv {\rm C \hbox{---} Si(CH}_{\rm 3})_3 . $$\end{document} Mit 4-6 Mol CH3MgBr entsteht aus (I) das mit LiAlH4 bildet.Aus (VII) entstehen mit CH3MgCl die Verbindungen (II), (III), (VI). Die Aufspaltung von (I) zum Fünfring (VII) und die Spaltung von (VII) zu linearen Verbindungen wird über β-Eliminierungen erklärt.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 336 (1965), S. 17-23 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Calcium iridium(IV)-oxide exists in two modifications: the first one is hexagonal (a = 5.441, c = 6.392 Å) and forms on heating mixtures of IrO2 and CaCO3. The other one is orthorhombic (a = 3.145, b = 9.855, c = 7.293 Å); single crystals of the compound are obtainable from a melt of the components in CaCl2.A PATTERSON synthesis yielded a trial-structure of the orthorhombic modification which crystallizes in the space group D2h17-Cmcm. The structure was refined by difference Fourier synthesis and least squares (R = 0.041; 99 reflections h k l). There results a distorted octahedron of oxygen surrounding each iridium; calcium exhibits a coordination number of 9.
    Notes: Calciumiridium(IV)-oxid existiert in zwei Modifikationen: einer hexagonalen (a = 5,441 Å, c = 6,392 Å), die beim Tempern einer Mischung von IrO2 und CaCO3 entsteht, und einer rhombischen (a = 3,145 Å, b = 9,855 Å, c = 7,293 Å), die in Form von Einkristallen aus einer Schmelze dieser Komponenten mit CaCl2 erhalten wird.Mit Hilfe einer PATTERSON-Synthese konnte ein Strukturmodell der rhombischen, in der Raumgruppe D2h17-Cmcm kristallisierenden, Modifikation aufgestellt und mittels Differenz-Fourier-Synthesen und nach der Methode der kleinsten Quadrate verfeinert werden (R = 0,041 für 99 Reflexe h k l).Für Iridium ergibt sich verzerrt oktaedrische Sauerstoffumgebung. Calcium zeigt die Koordinationszahl 9.
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