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  • 11
    Electronic Resource
    Electronic Resource
    Binding of metal cations by natural substances (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 675-681 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: The binding of mercuric chloride and other metal salts to bark, activated sludge (Milorganite), chitosan, poly(p-aminostyrene), and other natural and synthetic materials was investigated by specific atomic absorption and x-ray fluorescence spectroscopy. The synthetic poly(aminostyrene) was included for comparison with the natural polyamine chitosan. Our results show that a wide range of natural materials are potentially useful for the removal of toxic and precious metals that may be present in industrial effluents, mine waters, or other water supply. Such metal salts include those of mercury, lead, zinc, cadmium, copper, nickel, cobalt, iron, manganese, silver, platinum, palladium, and gold.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180305
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  • 12
    Electronic Resource
    Electronic Resource
    Sorption behavior of mercuric and methylmercuric salts on wool (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 377-390 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: Sorption by wool of mercuric nitrate, mercuric chloride, and methylmercuric chloride was measured by atomic absorption spectroscopy. Both inorganic mercury compounds are efficiently taken up at low concentrations from acid solution. The rate of binding from the nitrate is appreciably slower than from the chloride. Methylmercuric chloride is bound slowly at low pH, rapidly at pH 6. The extent of its binding is roughly 10% to 20% of that of the inorganic salts. The wool-bound mercury can be recovered by serial extraction with aqueous citrate or ethylenediaminetetraacetate at pH 6. The residual, firmly bound mercury is roughly equivalent to the sulfhydryl sulfur. Sorption of inorganic mercury compounds at low pH roughly follows a Freundlich isotherm in the concentration range 5×10-6 to 10-1M. Sorption of methylmercurie chloride at pH 6 follows a roughly parallel isotherm in the range 5×10-6 to 10-3M. These data suggest the potential value of wool and other animal keratins to remove and recover mercury from contaminated water. Wool may also serve as an instructive model for mercury binding and release in the body.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170205
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  • 13
    Electronic Resource
    Electronic Resource
    True cholinesterases with pronounced resistance to eserine (1946)
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 27 (1946), S. 69-85 
    Details
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1030270202
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  • 14
    Electronic Resource
    Electronic Resource
    Untersuchungen von Struktur und Funktion von Proteinen mit einem erweiterten genetischen Code (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 107 (1995), S. 677-690 
    Details
    ISSN: 0044-8249
    Keywords: Aminosäuren ; Mutagenese ; Proteinsynthese ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine allgemeine biosynthetische Methode wurde entwickelt, um ortsspezifisch nichtnatürliche Aminosäuren mit neuartigen sterischen und elektronischen Eigenschaften in Proteine einzuführen. Sie beginnt damit, daß das Codon für die jeweilige Aminosäure durch Oligonucleotid-Mutagenese durch das Nonsense-Codon UAG, ein „Leerzeichen“ des genetischen Codes, ersetzt wird. Für dieses spezielle Codon wird eine Suppressor-tRNA hergestellt und in vitro chemisch mit der gewünschten nichtnatürlichen Aminosäure aminoacyliert. Gibt man diese aminoacylierte tRNA in ein In-vitro-Proteinsynthesesystem, das von der mutagenisierten DNA gesteuert wird, wird die gewünschte Aminosäure einheitlich in der angestrebten Stelle im Protein eingebaut. Die Methode wurde jüngst eingesetzt, um die katalytischen Eigenschaften, die Spezifität und die Stabilität einiger Proteine zu untersuchen. Aminosäuren und ihre Analoga mit veränderten Eigenschaften bei der Wasserstoffbrückenbindung, mit veränderten sterischen Eigenschaften und mit anderen Konformationen des Rückgrats wurden ebenso ortsspezifisch in Proteine eingebaut wie lichtaktivierbare Aminosäuren und biophysikalische Sonden. Damit sollten weitergehende detaillierte physikalisch-organische Untersuchungen an dieser wichtigen Klasse von Makromolekülen möglich werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19951070604
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  • 15
    Electronic Resource
    Electronic Resource
    Probing Protein Structure and Function with an Expanded Genetic Code (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 34 (1995), S. 621-633 
    Details
    ISSN: 0570-0833
    Keywords: amino acids ; mutagenesis ; proteins ; Proteins ; Protein structures ; Amino acids ; Mutagenesis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A general biosynthetic method has been developed which makes it possible to site-specifically incorporate unnatural amino acids with novel properties into proteins. In this approach the codon encoding the amino acid of interest is replaced with the “blank” nonsense codon UAG by oligonucleotide-directed mutagenesis. A suppressor tRNA that recognizes this codon is generated by run-off transcription and then chemically aminoacylated with the desired unnatural amino acid. Addition of the mutagenized gene and the aminoacylated suppressor tRNA to an in vitro extract capable of supporting protein biosynthesis generates a mutant protein containing the unnatural amino acid at the specified position. This methodology has recently been used to study the stability, specificity, and catalytic properties of a number of proteins. In these studies amino acids and analogues possessing altered hydrogen-bonding, electronic, and steric properties and unique backbone conformations have all been site-specifically incorporated into proteins. In addition, photoactivatable amino acids, isotopically labeled amino acids, and amino acids bearing biophysical probes have been inserted site-specifically. This chemistry increases our ability to carry out detailed physical organic studies on this important class of macromolecules.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199506211
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  • 16
    Electronic Resource
    Electronic Resource
    The Photochemistry of Organic Solids (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 386-393 
    Details
    ISSN: 0570-0833
    Keywords: Photochemistry ; Solid-state photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: During the years that he was at the Weizmann Institute of Science the late G. M. J. Schmidt initiated and developed a very vital research program on the relationship between the structures of organic crystals and the reactions which occur in these crystals. As the program developed the “solid-state group” became larger and more diversified - X-ray crystallographers, organic chemists, spectroscopists, and even theoreticans had their contributions to make. Professor Schmidt died in 1971. As one of the members of this group, I here present a review of recent developments in parts of the field of interest to me.Of the reactions of organic crystals which have been studied thus far a large number are induced by light and other radiation. This is because radiation, unlike most chemical reactants, can readily penetrate the surface of the crystal, and thus reach the sites one wishes to activate. It is my aim in this article to point out some of the principles operative in the photochemistry of organic crystals. I shall choose examples to illustrate these principles and will not attempt to cover all the various types of reaction and systems which have been studied.It is appropriate at this stage to pay tribute to the memory of another great scientist who recently passed away - Theodorr Föster. Many of the ideas which I develop here are extensions of Professor Förster's earlier work, as are so many of the recent developments in photochemistry.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197503861
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