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  • 1
    Keywords: Electronics ; Materials ; Nanotechnology
    ISBN: 9783540328209
    Language: English
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  • 2
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0878
    Keywords: Seminal vesicles ; Rat ; Epithelium ; Proliferation activity ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung An 12 männlichen weißen Wistarratten unterschiedlichen Alters wurde autoradiographisch die Proliferation des Samenblasenepithels zur Zeit der Pubertät geprüft. Die Tiere waren 21, 29, 40, 50, 60 und 180 Tage alt und erhielten 1 Std vor der Tötung durch Dekapitation 2,5 μC 3H-Thymidin/g Körpergewicht i. p. appliziert. Ausgewertet wurden Autoradiogramme nach einer Expositionszeit von 18 Tagen; bestimmt wurde der Prozentsatz der markierten Zellkerne (3H-Index). Im Gegensatz zu dem bekannten exponentiellen Abfall des 3H-Indexes bei nicht-hormonabhängigen Leberepithelien jugendlicher Ratten kommt es beim Epithel der Samenblasen um den 40. Lebenstag zu einem erneuten, starken Proliferationsschub. Diese starke Wachstumszunahme ist wahrscheinlich der proliferationskinetische Ausdruck der nach Steinberger (1970) zur gleichen Zeit stattfindenden hormonellen Umschaltung in den Testes. Anschließend geht das Vermehrungswachstum des jugendlichen Tieres, durch das die Zellzahl erhöht wird, in das Erhaltungswachstum über; der 3H-Index des Samenblasenepithels erreicht den Wert des erwachsenen Tieres.
    Notes: Summary In 12 male white rats (Wistar) the proliferative activity of the epithelial cells in the seminal vesicles was studied by autoradiography. The animals were 21, 29, 40, 50, 60 and 180 days old. Each animal was given 2.5 μC/g 3H-thymidine and was killed 1 hour thereafter. We analysed the autoradiograms recording the percentage of labelled nuclei (3H-index). While the 3H-index of the non hormone-dependent epithelial cells in the liver of young rats declines continously with growing age (Stocker et al., 1964), the epithelial cells in the seminal vesicles of 40 days old rats show a remarkable rise in their proliferative activity. It is quite possible that this new peak in the proliferation is the morphological result of a preceeding switch in hormonal production of the testes as reported by Steinberger (1970). Thereafter the growth proliferation of the young rats declines into the steady state of the grown up.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 185 (1982), S. 498-501 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ribosomal subunits from the thermoacidophilic Archaebacterium Sulfolobus were purified and their protein composition analyzed by gel electrophoretic methods. A tentative nomenclature was proposed. 30S subunits contained 27, and 50S subunits 34, electrophoretically distinguishable proteins. Three additional proteins were present on both the 30S and 50S subunits. The protein pattern of three geographically different isolates of Sulfolobus (Italy, Japan, Yellowstone) were nearly identical.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 1 (1945), S. 163-165 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 6
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991):65R10, 44A10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. Methods for the numerical inversion of a Laplace transform $F(s)$ which use a special bilinear transformation of $s$ are particularly effective in many cases and are widely used. The main purpose of this paper is to analyze the convergence and conditioning properties of a special class of such methods, characterized by the use of Lagrange interpolation. The results derived apply both to complex and real inversion, and show that some known inversion methods are in fact in this class.
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A hypothesis is presented on the formation of stable covalent metal boron bonds in molecular compounds, and the synthesis of X2B—Mn(CO)4P(C6H5)3 and XB[Mn(CO)4P(C6H5)3]2 (X = C6H5, C4H9, Cl, NR2, OCH3) is described. These compounds are more stable than the corresponding Mn(CO)5-derivatives. This is attributed to differences in the electron density at the manganese atom. 11B - NMR studies are interpreted in terms of back-donation of metal d-electrons to the tervalent boron atom.
    Notes: Nach kurzer Erörterung einiger Leitgedanken, die dem Aufbau kovalenter Bor - Metall Bindungen in molekularen Verbindungen zugrunde liegen, wird die Synthese von X2B—Mn(CO)4P(C6H5)3 und XB[Mn(CO)4P(C6H5)3]2 (X = C6H5, C4H9, Cl, NR2, OCH3) beschrieben. Diese Verbindungen sind stabiler als die entsprechenden Mn(CO)5-Derivate, was wahrscheinlich auf Unterschieden in der Elektronendichte an den Manganatomen beruht. 11B-kernresonanzspektroskopische Untersuchungen weisen auf eine Beteiligung der Metall-d-Elektronen an der Mangan--Bor-Bindung hin.
    Additional Material: 3 Tab.
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: P2J3 - a New Complex LigandP2J4 and Na2Cr(CO)5 react in benzene to the monomeric diamagnetic complex (CO)4CrP2J3. The 31P-nmr spectrum shows the presence of different bonded phosphorus atoms. The exchange of one iodine atom between the P atoms leads to a temperature dependent equilibrium with a symmetrical transition state. Triphenyl- and tricyclohexylphosphine react with (CO)4CrP2J3 to (CO)4CrPJ2 · P(C6H5)3 resp. (CO)4CrPJ2 · P(C6H11)3, probably of dimeric nature.
    Notes: P2J4 und Na2Cr(CO)5 reagieren in Benzol zu dem monomeren, diamagnetischen Komplex (CO)4CrP2J3. Das 31P-NMR-Spektrum zeigt die Anwesenheit unterschiedlich gebundener Phosphoratome. Der Austausch eines Jodatoms zwischen den P-Atomen führt zu einem temperaturabhängigen Gleichgewicht, in dem ein symmetrischer Übergangszustand auftritt. Triphenyl- und Tricyclohexylphosphin reagieren mit (CO)4CrP2J3 zu (CO)4 · P(C6H5)3 bzw. (CO)4 CrPJ2 · P(C6H11)3, wahrscheinlich dimerer Natur.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 160-166 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Use of Elemental Phosphorus as Ligand in Iron CarbonylsWhite phosphorus and Fe2(CO)9 react in benzene at room temperature to the monomeric diamagnetic complex [(CO)4Fe]3P4. The Mössbauer spectrum proves the presence of penta- and hexacoordinated Fe atoms in the ratio 1:2. The i.r. spectrum also suggests different bonded Fe(CO)4 groups. As the 31P-n.m.r. spectrum shows, the 4 P atoms are equivalent. It is supposed that one Fe(CO)4 group fluctuates between the P atoms. At 70°C P4 and Fe2(CO)9 react to the polymeric diphosphorous complex [(CO)3FeP2]n. Its synthesis succeeds also with Fe(CO)5 and P4 under u.v. irradiation. Additionally [(CO)4Fe]3P4 can be decomposed to [(CO)3FeP2]n by warming or irradiation. The Mössbauer spectrum of this complex shows equivalent Fe atoms with the coordination number 6. Possible structures are discussed.
    Notes: Weißer Phosphor und Fe2(CO)9 reagieren in Benzol bei Raumtemperatur zu dem monomeren, diamagnetischen Komplex [(CO)4Fe]3P4. Das Mössbauerspektrum belegt die Anwesenheit fünffach und sechsfach koordinierter Fe-Atome im Verhältnis 1:2. Auch das IR-Spektrum legt unterschiedlich gebundene Fe(CO)4-Gruppen nahe. Wie das 31P-NMR-Spektrum zeigt, sind alle 4 P-Atome äquivalent. Es wird angenommen, daß eine Fe(CO)4-Gruppe zwischen den P-Atomen fluktuiert. Bei 70°C setzen sich P4 und Fe2(CO)9 zu dem polymeren Diphosphorkomplex [(CO)3FeP2]n um. Dessen Synthese gelingt auch aus Fe(CO)5 und P4 unter UV-Bestrahlung. Ebenso kann [(CO)4Fe]3P4 durch Erwärmen oder Belichten in [(CO)3FeP2]n zersetzt werden. Das Mössbauerspektrum dieses Komplexes zeigt äquivalente Fe-Atome mit der Koordinationszahl 6. Mögliche Strukturen werden diskutiert.
    Additional Material: 5 Ill.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 56. 2-(Dimethylaminomethyl) ferrocenyl-Derivate des Titans und Zirconiums - Grenzen der ChelatbildungAls neue Titanocen- bzw. Zirconocenkomplexe wurden das paramagnetische (η5-C5H5)2Ti(FcN) III (FcN = 2-[Dimethylaminomethyl]ferrocenyl) und das diamagnetische (η5-C5H5)2Zr(1-Camph)(FcN) IV (1-Camph = 1-Camphenyl) synthetisiert und durch Massen-, 1H- und 13C-NMR-Spektren sowie magnetische Messungen charakterisiert. Ferner wurden die Kristall- und Molekülstrukturen von (η5-C5H5)2M(FcN)2 (M = Ti I, Zr II) bestimmt. Eine M—C, N-Chelatbildung mit dem (Dimethylaminomethyl)ferrocenyl-Liganden wurde bei III (im Festkörper) und IV (in Lösung) gefunden, während diese bei I und II im kristallinen Zustand ausbleibt.
    Notes: The new paramagnetic (η5-C5H5)2Ti(FcN) III (FcN = 2-[dimethylaminomethyl]-ferrocenyl) and diamagnetic (η5-C5H5)2Zr(1-Camph)(FcN) IV (1-Camph = 1-Camphenyl) complexes were prepared and characterized by spectra and magnetic measurements. The crystal and solid phase molecular structures of (η5-C5H5)2M(FcN)2 (M = Ti I and Zr II) compounds were determined by single crystal X-ray diffraction. An M—C, N chelation of the (dimethylaminomethyl)ferrocenyl ligand was detected at compounds III (solid phase) and IV (solution), while such interaction fails at complexes I and II in crystalline phase.
    Additional Material: 3 Ill.
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