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  • 1
    Electronic Resource
    Electronic Resource
    Anreicherung von Tyrosinase durch Zerschäumung (1948)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 81 (1948), S. 354-355 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Eigenschaft der Tyrosinase, sich in wäßrigen Lösungen bevorzugt im Schaum zu verteilen, wird benutzt, dieses Ferment mit Hilfe einer von Wo. Ostwald beschriebenen kontinuierlich arbeitenden Zerschäumungsvorrichtung anzureichern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19480810413
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  • 2
    Electronic Resource
    Electronic Resource
    Über eine colorimetrische Bestimmungsmethode für Tyrosinase und ihre Anwendung bei kautschukführenden Löwenzahnrassen (1948)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 81 (1948), S. 340-353 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde gefunden, daß die kautschukführenden Wurzeln von Taraxacum Kok-saghyz Rod. tyrosinasefreisind, während der mit Koksaghyz nahe verwandte kautschukfreie Löwenzahn (Taraxacum officinale) Tyrosinase enthält. Um festzustellen, welche Beziehung zwischen Kautschuk und Tyrosinase besteht, wurden Hybriden aus beiden Rassen herangezogen, für deren Untersuchung ein colorimetrisches Verfahren angegeben wird, das auch sehr geringe Gehalte von Tyrosinase mit genügender Genauigkeit zu ermitteln gestattet.Das Verfahren beruht auf einer kurzzeitigen Verfolgung der Bildung des roten Farbstoffs aus Tyrosin durch Messung der Lichtabsorption mit dem Photozellencolorimeter nach R. Havemann, während der die in Skalenteilen des Geräts über der Zeit aufgetragenen Reaktionskurven einen geradlinigen Verlauf zeigen. Der Neigungswinkel der Geraden gegen die Abszisse bzw. seine Tangente ist in einem genügend großen Meßbereich der Fermentkonzentration annähernd proportional und kann als relatives Maß für die Aktivität der Fermentpräparate gelten. Eine durch Titration der Reaktionslösungen ermittelte Bezugskurve zwischen dem tg-Wert und dem Tyrosinase-Umsatz nach 2 Stunden führt zu der scheinbaren Wirkungseinheit des Ferments, als die der Umsatz von 1 mg Tyrosin gewählt wird, Woraus sich als absoluter Tyrosinasewirkungswert die Zahl der Wirkungseinheiten/1 g Wurzeltrockensubstanz ergibt.Aus dem Vergleich der Tyrosinasewirkungswerte mit den Kautschukgehalten der Hybriden ergibt sich, daß eine Beziehung zwischen Tyrosinasegehalt und Kautschukgehalt in den Wurzeln nicht besteht. Dadurch ist die Annahme nahegelegt, daß Kautschuk-An-und Abwesenheit sowie Tyrosinase-An- und Abwesenheit für die beiden Stammarten je ein gegensätzliches Merkmalspaar darstellen, die  -  jeweils das eine unabhängig vom anderen - zur Bildung von dihybriden Kreuzungen führen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19480810412
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  • 3
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    Azaspiracid shellfish poisoning: a review on the chemistry, ecology, and toxicology with an emphasis on human health impacts (2021)
    In:  Mike.Twiner@noaa.gov | http://aquaticcommons.org/id/eprint/14901 | 403 | 2014-03-10 19:58:44 | 14901 | United States National Ocean Service
    Details
    Publication Date: 2021-06-28
    Description: Azaspiracids (AZA) are polyether marine toxins that accumulate in various shellfish species and have been associated with severe gastrointestinal human intoxications since 1995. This toxin class has since been reported from several countries, including Morocco and much of western Europe. A regulatory limit of 160 μg AZA/kg wholeshellfish flesh was established by the EU in order to protect human health; however, in some cases, AZA concentrations far exceed the action level. Herein we discuss recent advances on the chemistry of various AZA analogs, review the ecology of AZAs, including the putative progenitor algal species, collectively interpret the in vitro and in vivo data on the toxicology of AZAs relating to human health issues, and outline the European legislature associated with AZAs.
    Keywords: Chemistry ; Ecology ; Fisheries ; Health
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 39-72
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  • 4
    Electronic Resource
    Electronic Resource
    Application of data consistency tests and new parameter estimation methods to microbial growth on corn dust in batch culture (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 2333-2360 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The microorganism Candida utilis was grown on both filtered and unfiltered substrate obtained from enzymatic hydrolysis of starch in corn dust. For growth on filtered substrate, the average integrated biomass energetic yield value based on biomass-substrate data was η = 0.55 and for growth on unfiltered substrate an average yield value of η = 0.59 was obtained. Material and energy balances showed that the presence of unfiltered corn residue in the media had no significant effect on the yields. Statistical methods were developed and used to obtain best estimates of the growth parameters. Values of the biomass energetic yield corrected for maintenance (ηmax = 0.619) and the maintenance coefficient (me = 0.043) were obtained for growth on filtered substrate. Values of ηmax = 0.741 and me = 0.142 were obtained for the growth on unfiltered substrate. The consistency of data and parameter estimates was relatively good for filtered substrate; however, parameter estimates for unfiltered substrate were not consistent. Growth experiments without filtration of the products of starch hydrolysis resulted in protein-enriched products with about 39.73% protein.
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260231015
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  • 5
    Electronic Resource
    Electronic Resource
    Maximum likelihood estimation of growth yields (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 633-649 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This work is concerned with statistical methods to estimate yield and maintenance parameters associated with microbial growth. For a given dilution rate, an experimenter typically measures substrate concentration, oxygen utilization rate, the rate of carbon dioxide evolution, and biomass concentration. These correlated response variables each contain information about the maintenance and yield parameters of interest. A maximum likelihood estimator which combines this correlated information for the yield and maintenance parameters is proposed, evaluated, and tested on literature data. Both point and interval estimators are considered.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240309
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  • 6
    Electronic Resource
    Electronic Resource
    Elektrokatalytische Cyanomethylierung von Azomethinen: Eine neue Synthese für β-Aminonitrile (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 487-490 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrocatalyzed Cyanomethylation of Azomethines: A New Synthesis for β-AminonitrilesCertain Schiff-bases (2-7) react in acetonitrile (1) at a Hg-cathode in a new electrocatalyzed cyanomethylation method in good yields without side-products to β-aminonitriles (2a-7a). The synthesis is initiated by an electrochemical deprotonation of 1 by azomethine-radical anions in catalytical amount to acetonitril anions (B-). During nucleophilic reaction of B- with 2-7 up to its complete consumption, the cyanomethylation synthon B- is regenerated in a cyclic, self-reproducing process. Quantum chemical calculation in context with cyanomethylation product analysis permit mechanistical insights and exact prediction of suitable azomethines and coupling position for B-.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340607
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese von cyanosubstiuierten Di- und Tetrahydropyridinen in DIMCARB (Dimethylamin-CO2-Additionsverbindung) (1997)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 414-419 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Cyanosubstituted Di- and Tetrahydropyridines in DIMCARB (Dimethylamine-CO2-Adduct)A new selective method for base-catalyzed ring closure reaction of acetophenones (1a-I) with malononitrile in DIMCARB (dimethylamine-CO2-addition-compound) as solvent of high dimethylamine concentration is reported, which allows effective syntheses of (1.2-dihydro-4-pyrid-6-yl)dicyanomethanides and 5-cyano-6-dicyanomehylene-1,2,3,6-tetrahydropyridines in good yields. The structure of the two new classes of compounds is proved by X-ray diffraction analysis.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19973390173
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  • 8
    Electronic Resource
    Electronic Resource
    R. Daniel Little, N. L. Weinberg (Hrsg.), Electroorganic Synthesis. Beitragssammlung, 121 Autoren, Festschrift für M. M. Baizer, 472 S., 115 Abb., Marcel Dekker Inc., New York 1991 (Elektrochemie), geb., $ 172,50 (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 94-94 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360125
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  • 9
    Electronic Resource
    Electronic Resource
    Kurzzeitprüfungen mit einer neuen KorrosionsprüfkammerÜberarbeitete Fassung eines Vortrages, gehalten vor dem Schweiz. elektrotechnischen Komitee am 25. 2. 1955 in Zürich. (1955)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 325-328 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Short-time-tests in a new test-chamber for corrosionAt first the author discusses the problems of short time tests and refers to the faults of sprayers operated by spray nozzles. Then he describes the „Aerosol apparatus“ which allows to produce a fine homogenous fog. This device was the basis for the development of a new test chamber for corrosion. Finally the advantages of this device are emphasized and some applied experiments and their results described.
    Notes: Der Verfasser streift zuerst die Probleme, die sich bei Kurzzeitprüfungen stellen und weist auf die Fehler hin, die bei Sprühgeräten auftreten, welche mit Düsen arbeiten. Dann wird ein Aerosolapparat beschrieben, der gestattet, einen feinen und gleichmäßigen Nebel zu erzeugen. Dieses Gerät diente als Grundlage für die Entwicklung einer neuen Korrosionsprüfkammer. Anschließend werden die Vorteile dieser Einrichtung hervorgehoben. Schließlich werden noch praktische Versuche und deren Resultate beschrieben.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19550060702
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  • 10
    Electronic Resource
    Electronic Resource
    Polymers for stabilization of colloidal cobalt particles (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1915-1927 
    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: A process for preparing metiallic cobalt particles of uniform size in the 10-1000 A. range is described. Dicobalt octacarbonyl is thermally decomposed in solutions of dispersant polymers to form stable colloids of discrete particles which are separated by polymer coatings. Variatin of polymer composition, molecular weight, and solvent used results in a variation of particle size and colloid stability. Preparation of single-domain ferromagnetic cobalt particles with good magnetic properties depends on a very delicate balance between dispersant polymer, solvent, and the growing metal particle. A number of addition and condensation polymers can act as dispersants. The most successful are linear addition polymers of high molecular weight having relatively nonpolar backbones. Ideally, groups with a polarity greater than the backbone are attached at intervals of at least 100 but not more than 200 backbone atoms. The need for more polar groups and their spacing becomes les critical with increasing polymer molecular weight. The polymers appear to stabilize the metal particles by adsorption to form a thick fiml which separates the particles sufficiently to keep van der Walls energy of attraction below thermal energy levels. The solvent must solubilize the polymer coating sufficiently to allow the particle to grow. It should be less polar than the most polar group in the polymer and be chemically inert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070101209
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