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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 465 (1980), S. 204-208 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neue Chelate des Bis-β- Carbomethoxyethlzinn(IV)Zwei- und dreizähnige Chelatinganden (s. Abstract) Können die Chloratome des Bis-β-carbomethoxethyldichlozinn(IV) unter Bildung neuer stabiler Chelatverbindungen ersetzen. Bromierung dieser Verbindungen unter milden Bedingungen zeigt, daß die Chelatinganden bevorzugt abgespalten werden. Die neun Verbindungen werden durch Elementaranalyse, IR- und PMR-Spektren sowie Molekulargewichtsbestimmungen Charakterisiert und mögliche Strukturen werden Vorgeschlagen.
    Notes: Bi- and tri-denate Chelating ligands (acetylacetone, salicylasehyde, 8-hydroxy quinoline, dibenzoylmethane, benzoyl phenhydroxlmanine, 2-hydroxy benzophenone, 2-hydroxy 4-methoxy benzophenone and salichyaldine) replace cholrine atoms of bis-β-carbomethoxyethyl dischlorotin (IV) to form new stable Cheleted compounds. Bromination studies under mild conditions indicate that in these compounds the Cheleated ligand part is preferentially cleaved. The new compounds are characterized by elemental analysis. IR and PMR spectra and molecular weight, and possible structures have been assigned.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1980-06-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 130 (1981), S. 50-53 
    ISSN: 1432-072X
    Keywords: Bound NTPs ; Injection of DNA ; Phage bound Ca2+ ; Equilibrium dialysis ; Mycobacteriophage I3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The association of nucleoside triphosphate molecules and calcium ions with purified particles of mycobacteriophage I3 has been documented. The content of nucleoside triphosphate has been determined to be 118 molecules per phage particle by equilibrium dialysis against labelled ATP or 148 molecules per phage particle by the direct determination of labelled nucleoside triphosphate. The concentration of bound Ca2+ exhibited a high degree of variation between different batches, which may be due to the nonspecific binding of Ca2+ by the virus particles. However, the tightly bound Ca2+ not removable by dialysis against calciumspecific chelating agent, showed a constant value of 2985 atoms/phage particle.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 124 (1980), S. 249-254 
    ISSN: 1432-072X
    Keywords: Calcium ions ; Phage propagation ; Phage DNA injection ; Mycobacteriophage 13
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ca2+ ions are absolutely necessary for the propagation of mycobacteriophage I3 in synthetic medium. These ions are required for successful infection of the host and during the entire span of the intracellular development of the phage. A direct assay of the phage DNA injection using 32[P] labelled phage, showns that Ca2+ ions are necessary for the injection process. The injection itself is a slow process and takes 15 min to complete at 37°C. The bacteria infected in presence of Ca2+ tend to abort if the ions are subsequently withdrawn from the growth medium. The effect of calcium withdrawal is maximally felt during the early part of the latent period; however, later supplementation of Ca2+ ions salvage phage production and the mature phage progeny appear after a delayed interval, proportional to the time of addition of Ca2+.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 136 (1983), S. 275-280 
    ISSN: 1432-072X
    Keywords: Transfection ; Mycobacterium smegmatis ; Mycobacteriophage I3 ; Calcium sensitization ; Glycine sensitization ; Protamine sulfate ; Exogenous RNA ; DNA uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mycobacterium smegmatis SN2 does not exhibit natural competence for the uptake of phage I3 DNA. Competence can artificially be induced by treatment with glycine or CaCl2, and the combination of both is even more effective. The efficiency of transfection can be improved by inclusion of protamine sulphate and heterologous RNA in the system. From 32P DNA uptake studies the major barrier for the entry of DNA has been found to be the complex cell wall. The efficiency of transfection calculated on the basis of fraction of DNA which has entered the cell is comparable to that of other bacterial systems. The phage development takes a longer time (7 h for one cycle) after transfection, as compared to infection (4 h).
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 15 (1982), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 63 (1983), S. 497-509 
    ISSN: 1432-2234
    Keywords: Definition and properties of valency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A quantum chemical definition of the valency of an atom in a molecule is proposed. It is defined as the sum of the squares of the appropriate offdiagonal elements of the first-order density matrix of the system in an orthogonal basis. It is a measure of the degree of electron sharing of the given atom with the other atoms. Its properties such as invariance to rotation of the coordinate system, its limiting values as well as its relation to natural hybrids and bond orbitals are discussed.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 63 (1983), S. 511-527 
    ISSN: 1432-2234
    Keywords: Valency of first-row atoms ; Free valence ; Bond indices ; Natural hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A quantum chemical definition of valency proposed in Part I is used to calculate the valency of carbon, nitrogen, oxygen, lithium, beryllium and boron in a number of compounds with the SINDO1 method. It is demonstrated that consistency of the basis set is necessary for comparable results. The general features of valency and bonding in these molecules are discussed. The π-electron concept of free valence is generalised to sigma systems and atoms in molecules are classified as subvalent, normal or hypervalent. The relation between valency and natural hybrid occupancy is illustrated. The symmetry properties of natural hybrid orbitals are discussed by means of group theory. A preliminary attempt is made to relate covalency and covalent reactivity. Bond indices and the σ, π character of bonds are obtained by a suitable partitioning and projection of valency into bonding and antibonding contributions.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 63 (1983), S. 497-509 
    ISSN: 1432-2234
    Keywords: Definition and properties of valency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A quantum chemical definition of the valency of an atom in a molecule is proposed. It is defined as the sum of the squares of the appropriate offdiagonal elements of the first-order density matrix of the system in an orthogonal basis. It is a measure of the degree of electron sharing of the given atom with the other atoms. Its properties such as invariance to rotation of the coordinate system, its limiting values as well as its relation to natural hybrids and bond orbitals are discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 63 (1983), S. 511-527 
    ISSN: 1432-2234
    Keywords: Valency of first-row atoms ; Free valence ; Bond indices ; Natural hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A quantum chemical definition of valency proposed in Part I is used to calculate the valency of carbon, nitrogen, oxygen, lithium, beryllium and boron in a number of compounds with the SINDO1 method. It is demonstrated that consistency of the basis set is necessary for comparable results. The general features of valency and bonding in these molecules are discussed. The π-electron concept of free valence is generalised to sigma systems and atoms in molecules are classified as subvalent, normal or hypervalent. The relation between valency and natural hybrid occupancy is illustrated. The symmetry properties of natural hybrid orbitals are discussed by means of group theory. A preliminary attempt is made to relate covalency and covalent reactivity. Bond indices and the σ, π character of bonds are obtained by a suitable partitioning and projection of valency into bonding and antibonding contributions.
    Type of Medium: Electronic Resource
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