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  • 1980-1984  (15)
  • 1975-1979
  • 1905-1909
  • 1982  (15)
  • Inorganic Chemistry  (10)
  • Biochemistry and Biotechnology  (2)
  • 42.55  (1)
  • AKR Leukemia  (1)
  • Nuclear reactions
  • Physics
Material
Years
  • 1980-1984  (15)
  • 1975-1979
  • 1905-1909
Year
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  • 1
    ISSN: 1432-0584
    Keywords: AKR Leukemia ; Vincristine ; Recruitment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to investigate the influence of a cell-cycle specific agent on the cytokinetic behavior of a leukemic cell population in vivo, labeling studies with tritiated thymidine (3HTDR) followed by administration of vincristine (VCR) were performed on thymic cells of advanced AKR leukemic mice and evaluated utilizing a combined autoradiographic-Feulgen-microspectrophotometric technique. Twelve hours after a single drug injection the stathmokinetic effect of VCR was observed as reflected by an accumulation of cells in the S/G2-M phase of the mitotic cycle. Within 28 h this effect was no longer evident, but the significant increase in % unlabeled S/G2-M cells strongly suggested an influx of previously non-proliferating cells into the proliferating compartment (recruitment).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0649
    Keywords: 42.70 ; 42.55 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 1901-1904 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 1905-1909 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 20 (1982), S. 389-398 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The glass transition behavior of two sets of ABA poly(styrene-b-isoprene) block copolymers was examined by differential scanning calorimetry. In one series, the triblock copolymers had different total molecular weights and the same (30 wt %) polyisoprene content, in the other, the molecular weight was constant (30,000 g/mol) and the elastomer content was the variable. For all triblock copolymers studied, the data show an inward shift for the glass transition temperatures Tg of the corresponding homopolymers. This shift increases for the rigid-phase Tg as the polystyrene block length decreases. Depending on their molecular characteristics, two, three, or only one Tg were found. The third Tg was interpreted in terms of the existence of an interphase. Some of these conclusions could be confirmed by transmission electron microscopy.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 490 (1982), S. 121-128 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Spectroscopic Studies of 15N Labelled OxocyclophosphazanesThe completely 15N labelled cyclophosphazanes (15NMeP(OMe)O)3, (15NEtP(OEt)O)3, and (15NMeP(OMe)O)4 were prepared by rearrangement of the corresponding alkoxyphosphazenes and their 31P- and 15N-NMR spectra were investigated. On the case of the trimer compounds spectra of the ABB′XX′Y spin type were obtained; all coupling constants are relevant, and like the 15N chemical shifts they are found only by means of spectra simulations. The relative signs of the coupling constants 1JPN, 2JPP, 2JNN, and 3JPN were also obtained.
    Notes: Die vollständig 15N-markierten Cyclophosphazane (15NMeP(OMe)O)3, (15NEtP(OEt)O)3 und (15NMeP(OMe)O)4 wurden aus den entsprechenden Alkoxyphosphazenen dargestellt und sowohl 31P- als auch 15N-NMR-spektroskopisch untersucht. Bei den trimeren Verbindungen wurden Spektren vom Spintyp ABB'XX'Y erhalten; alle Kopplungskonstanten sind relevant, sie können wie die 15N-chemischen Verschiebungen nur auf dem Wege der Spektrensimulation erhalten werden. Es ergeben sich auch die relativen Vorzeichen für die Kopplungskonstanten 1JPN, 2JPP, 2JNN und 3JPN.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 485 (1982), S. 133-140 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs2LiLuCl6: Two Modifications with Two Transitions in the Solid StateAt ambient temperature Cs2LiLuCl6 crystallizes with the trigonal HT-K2LiAlF6 structure type („6L-type“ form I, L). With increasing temperature a reversible, reconstructive solid to solid first order phase transition to the cubic-face centered K2NaAlF6-type („elpasolite“, form II) occurs at ≍ 325°C with a negative volume discontinuity. Above ≍ 510°C up to the melting point (≍ 675°C) again the 6L-type is observed (form I, H). The likewise reversible phase transition proceeds with a positive volume discontinuity. In both phase transitions 60° rotations occur within densest packed layers with [0 0.1] as rotation axis.
    Notes: Cs2LiLuCl6 kristallisiert bei Raumtemperatur im trigonalen HT-K2LiAlF6-Typ („6 L-Typ“ Form I, L). Bei Temperaturerhöhung beobachtet man bei ≍ 325°C eine reversible, rekonstruktive fest-fest-Umwandlung 1. Art unter Volumenabnahme in den kubisch-flächenzentrierten K2NaAlF6-Typ („Elpasolith“ Form II). Oberhalb ≍ 510°C tritt bis zum Schmelzpunkt (≍ 675°C) wiederum der 6L-Typ auf (Form I, H). Bei dieser ebenfalls reversiblen Umwandlung nimmt das Volumen zu. Die Phasenumwandlungen verlaufen über Drehsprünge (60°) um [0 0.1] innerhalb „dichtest-gepackter“ Schichten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 494 (1982), S. 91-97 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Hydridobis[1,2-bis(diphenylphosphinoethane)]dinitrogen-technetium(I)The crystal and molecular structure of the title compound HTcN2(diphos)2[diphos = (C6H5)2PCH2CH2P(C6H5)2] has been determined by X-ray analysis and 1H NMR spectra. Crystals are monoclinic, space group P21/n, with cell dimensions a = 11.090(3), b = 24.550(5), c = 16.379(4) Å, β = 96.02(2)°.The technetium atom is octahedrally co-ordinated with the hydridic hydrogen trans to the dinitrogen group. The Tc—N distance is 2.05(1) Å, the Tc—H distance is 1.7(1) Å. The Tc—P distances (2.359(7) Å) are remarkably shorter than in technetium complexes with mono-dentate phosphine ligands. The existence of the hydridic hydrogen is also confirmed by 1H NMR (δ = -10.08 ppm).
    Notes: Die Kristall- und Molekülstruktur der im Titel genannten Verbindung HTcN2 (diphos)2 [diphos = (C6H5)2PCH2CH2P(C6H5)2] wurde mittels Röntgenstruktur- und 1H-NMR-Spektroskopie ermittelt. Die Kristalle sind monoklin mit a = 11,090(3), b = 24,550(5), c = 16,379(4) Å, β = 96,02(2)°, Raumgruppe P21/n.Das Technetiumatom ist oktaedrisch koordiniert, der Hydrid-Wasserstoff befindet sich zum Distickstoff-Liganden in trans-Stellung. Der Bindungsabstand Tc—N beträgt 2,05(1) Å, der Tc-H-Abstand 1,7 (1) Å. Bemerkenswert kürzer ist der Abstand Tc—P (2,359(7) Å) im Vergleich zu Komplexen mit einzähnigen Phosphanliganden.Im 1H-NMR-Spektrum tritt bei δ = -10,08 ppm ein Signal für den Hydridwasserstoff auf.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 494 (1982), S. 189-195 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Intramolecular Mobility of Phosphin-3η-allyl Palladium Chloride ComplexesThe diastereomers of the complexes cis- and trans-2.3-diphenyl-1.3-oxaphosphorinan-3η-allyl palladiumchloride interchange. The activation parameters of the diastereomerization are estimated by line-shape analysis of the 31P - NMR signals.The exchange of allyl protons is described by 16 permutations involved in three graphes of the proposed seven modes of intramolecular movement.The cross-peaks in the 2D-exchange-1H - NMR spectrum display the exchanging protons.The results suggest a π-σ-transition together with a trigonal-bipyramidal arrangement of ligands in the transition state.
    Notes: Die Diastereomere der Komplexe cis- und trans-2,3-Diphenyl-1,3-oxa-phosphorinan-3η-allylpalladiumchlorid wandeln sich ineinander um. Die Aktivierungsparameter für diese Diastereomerisierung werden durch Linienformanalyse der 31P-NMR-Signale bestimmt.Der Positionswechsel der Allylprotonen wird durch 16 Permutationen beschrieben und in je drei Graphen den sieben vorgeschlagenen intramolekularen Bewegungsmechanismen zugeordnet. Aus den cross-peaks im 2D-Austausch-1H - NMR-Spektrum werden die miteinander im Positionswechsel befindlichen Protonen bestimmt.Die Ergebnisse sprechen für einen π-σ-Übergang mit trigonalbipyrymidaler Ligandenanordnung im Übergangszustand.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 491 (1982), S. 217-224 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: KDy2Cl7 and RbDy2Cl7, Phyllochlorodysprosates(III) with Face- and Edge-Sharing Monocapped Trigonal PrismsKDy2Cl7 (monoclinic, P21/a, Z = 4; a = 1 273.9(8), b = 688.1(5), c = 1 262.1(6) pm; γ = 89.36(3)°) and RbDy2Cl7 (orthorhombic, Pnma, Z = 4; a = 1 288.1(3), b = 693.5(2), c = 1 267.2(3) pm) show as hetto- and aristotype, respectively, structural arrangements unknown so far: monocapped trigonal prisms [DyCl7] are connected via common faces to form [Dy2Cl11] groups, these via common edges to form layers ∞2[(DyCl3/2fCl4/2e)2]. The layers are stacked in [100] direction and held together by K+ and Rb+, respectively.
    Notes: KDy2Cl7 (monoklin, P21/a, Z = 4; a = 1 273,9(8), b = 688,1(5), c = 1 262,1(6) pm; γ = 89,36(3)°) und RbDy2Cl7 (orthorhombisch, Pnma, Z = 4; a = 1 288,1(3); b = 693,5(2); c = 1 267,2(3) pm) zeigen als Hetto- bzw. Aristotyp einen bislang unbekannten strukturellen Aufbau: einfach bekappte trigonale Prismen [DyCl7] werden über eine Dreiecksfläche zu [Dy2Cl11]-Gruppen, diese über Kanten mit je vier weiteren solchen Gruppen zu einer Schicht ∞2[(DyCl3/2fCl4/2k)2] verknüpft. Längs [100] sind die Schichten gestapelt und werden über K+ bzw. Rb+ zusammengehalten.
    Additional Material: 4 Ill.
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