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  • Chemistry  (29)
  • allozymes  (3)
  • 306-U1313; AGE; COMPCORE; Composite Core; Depth, composite revised; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Exp306; Globorotalia inflata, δ13C; Globorotalia inflata, δ18O; Integrated Ocean Drilling Program / International Ocean Discovery Program; Intercore correlation; IODP; Joides Resolution; Mass spectrometer Finnigan MAT 252; North Atlantic Climate 2; Sample code/label  (2)
  • Isotopes
  • Lung surfactant secretion
Collection
Keywords
Publisher
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 939 (1988), S. 449-458 
    ISSN: 0005-2736
    Keywords: (Rat lung) ; Fluorescent probe ; Lung surfactant secretion ; Sodium ion/proton antiport ; Type II cell ; pH, intracellular
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 902 (1987), S. 317-326 
    ISSN: 0005-2736
    Keywords: (Rat lung) ; Carbocyanine dye ; Lung surfactant secretion ; Terbutaline ; Tetradecanoylphorbol acetate ; Tetraphenylmethylphosphonium ion ; Transmembrane potential ; Type II cell
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biochemical genetics 18 (1980), S. 303-309 
    ISSN: 1573-4927
    Keywords: Drosophila melanogaster ; allozymes ; GPT ; genetic mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We have used electrophoretic variants of glutamate-pyruvate transaminase (GPT, E.C. 2.6.1.2) in Drosophila melanogaster to genetically map the structural gene to position 42.6 on the X chromosome. By pseudodominance tests over several deficiencies we have localized it cytogenetically to the interval 11Fl-2 to 12Al-2. The sedimentation constant (s 20,w) of the native enzyme was determined in sucrose density gradients to be 5.9 and the native molecular weight approximately 87,000. The similarity in physical properties to mammalian enzymes suggests that the enzyme may also be dimeric in D. melanogaster.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-4927
    Keywords: dipeptidases ; variation ; allozymes ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Genetic variation at three dipeptidase loci (Dip-A, Dip-B, and Dip-C) in Drosophila simulans was analyzed by starch gel electrophoresis. Dip-A was found to be polymorphic in four populations, while Dip-B and Dip-C were found to be polymorphic in one. The numbers of different alleles found at each respective locus were: Dip-A, two; Dip-B, two; and Dip-C, three. Dip-A was genetically mapped at 57.9 on the second chromosome, and Dip-B and Dip-C at 80.9 and 87.9 on the third chromosome, respectively. Neither Dip-B nor Dip-C has been mapped in D. melanogaster because both loci are apparently monomorphic. Their map positions in D. simulans with respect to flanking markers whose homologous genes have been cytogenetically localized in D. melanogaster suggested that they might be mapped cytogenetically by using available deficiencies in D. melanogaster. Accordingly, by the construction of interspecific hybrids which carried deficiencies of melanogaster and an allele of simulans with a mobility different from that of the fixed melanogaster allele, Dip-B and Dip-C were localized between 87F12-14 and 88C1-3 and between 87B5-6 and 87B8-10, respectively, in the salivary gland chromosomes of D. melanogaster. The similarity between these two species is discussed on the basis of these findings.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-4927
    Keywords: malic enzyme ; nulls ; allozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The genetic and cytogenetic locations of the structural gene (Men) for malic enzyme have been determined. Men maps genetically between kar and ry at 51.73±0.02. Cytogenetically, Men probably lies in the proximal edge of 87D1,2, based on the results of mapping utilizing a number of deficiencies with breakpoints in that region. A number of null alleles have been recovered; heterozygotes for these nulls and a Men deficiency are both viable and fertile. These findings are related to the one band, one functional unit model of salivary gland chromosome structure.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3818-3834 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Systematic Investigations on the Behaviour of Organotin Compounds toward. Liquid Sulfur Dioxide, VII. Cleavage of Tin-Oxygen Bond with So2The hexaorganodistannoxanes 1a and b react with SO2 to yield bis(triorganotin) sulfites 2a, b. At higher temperatures, a disproportionation takes place yielding the sulfinates 3a, b resp. 5a, b and diorganotin sulfites 4a, b; possible reaction mechanisms are discussed. As by-products result the sulfates 6a and 8a as well as the thioester 7a. Triorganotin hydroxides 10a-c react in the same way. 4a-c are also obtained by addition of SO2 to diorganotin oxides 9a-c. The triorganotin alkoxides and phenoxides 11 and 13 add 1 mole of SO2 yielding the very sensitive triorganotin organylsulfites of which only 12 could be isolated. The constitution of the newly prepared compounds has been established by means of their i.r. and 1H n.m.r. spectra.
    Notes: Die Hexaorganodistannoxane 1a und b reagieren mit SO2 unter milden Bedingungen zu den Bis(triorganozinn)-sulfiten 2a, b. Bei höheren Temperaturen erfolgt dagegen eine Disproportionierung zu den Sulfinaten 3a, b bzw. 5a, b und Diorganozinn-sulfiten 4a, b; mögliche Reaktionsmechanismen werden diskutiert. Als Nebenprodukte entstehen die Sulfate 6a und 8a sowie der Thioester 7a. Analog verhalten sich die Triorganozinn-hydroxide 10a-c. 4a-c erhält man auch durch Addition von SO2 an Diorganozinn-oxide 9a-c. Die Triorganozinn-alkoxide und -phenoxide 11 und 13 addieren 1 mol SO2 unter Bildung der sehr hydrolyseempfindlichen Triorganozinn-organylsulfite, von denen nur 12 isoliert werden konnte. Die Konstitution der neu dargestellten Verbindungen wurde mit Hilfe ihrer IR- und 1H-NMR-Spektren gesichert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 94 (1961), S. 392-397 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tertiäre aromatische sowie aliphatisch- bzw. cycloaliphatisch-aromatische Phosphine reagieren mit Kalium oder Natrium unter Abspaltung eines Aryl oder Alkylrestes und Bildung von Alkaliphosphiden des Typs MePR2 bzw. MePRR'. Für eine Spaltungsreaktion ist die Anwesenheit eines aromatischen Restes im tert. Phosphin Voraussetzung. Während sich tert. aliphatische und cycloaliphatische Phosphine gegenüber Kalium indifferent verhalten, liefert bei analoger Reaktion beispielsweise Diäthylphenylphosphin Kalium-äthyl-phenyl-phosphid. Die Alkali-phosphide sind sehr reaktionsfähig und dienen zur Synthese weiterer phosphororganischer Verbindungen. Sie liefern bei der oxydativen Hydrolyse die entsprechenden Phosphinsäuren und mit Alkylhalogeniden Phosphoniumsalze.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 224-235 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, HPTLC ; Biological matrices ; Fluorimetric detection ; Selenium ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The present determination of selenium in biological matrices by HPTLC with in situ fluorimetric detection is an accurate alternative method, comparable to other established methods such as photometry, polarography, neutron activation, or X-ray fluorescence analysis, gas chromatography, and atomic absorption spectrometry.The excellent sensitivity of this procedure is proved by the detection limit of 250 fg of selenium per spot (using purified 2,3,1-naphthoselenodiazole). The oxidation of organic matrices, applying a novel digestion procedure, may be carried out with little instrumental expenditure.Sample preparation steps, such as the oxidation of selenium to Se (VI) and subsequent reduction to Se (IV) do not lead to significant random or systematic errors, nor does the digestion step, if an optimized procedure is used.A recovery rate of 103% and nearly parallel calibration curves for digested selenocysteine standards compared with spiked human serum samples demonstrate the accurate quantitative preparation of a biological matrix. Any interfering metal ions can be masked by addition of chelate-forming reagents.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die anionische Polymerisation von Maleinsäureanhydrid, initiiert mit Triphenylphosphin oder mit Tributylphosphin, wurde untersucht. Unter den gegebenen Reaktionsbedingungen entstanden Makro-Zwitterionen, deren Struktur vom jeweiligen Initiator bestimmt wurde. Im Falle der Polymerisationsauslösung mit Triphenylphosphin erhielt man Polymere, die Bernsteinsäureanhydrid-Gerüste und als deren Umlagerungsprodukt Cyclopentanonderivate enthielten. Bei der Polymerisationsauslösung mit Tributylphosphin gelangte man zu Polymerisaten, die weitgehend aus konjugierten Ketoolefinelementen bestanden. Zur Strukturaufklärung wurden IR, NMR- und massenspektroskopische Methoden benutzt. Die Makrozwitterionen wurden mittels Hochspannungselektrophorese nachgewiesen.Die Halbleitereigenschaften des aus konjugierten Ketoolefinelementen bestehenden Polymerisats werden diskutiert.Die Kinetik der Polymerisation von Maleinsäureanhydrid mit Triphenylphosphin wurde spektroskopisch untersucht. Die initiierende Reaktion des bei Reaktion mit dem Monomeren gebildeten Ylides war etwa 90 mal langsamer als das Kettenwachstum durch Addition des Monomeren an das wachsende Kettenende.
    Notes: The triphenyl and tributyl phosphine initiated polymerization of maleic anhydride was investigated. The structure of the macro zwitterions, formed under the given reaction conditions, depended on the initiator employed. If the polymerization was initiated by triphenyl phosphine, the macromolecules contained succinic anhydride units and cyclopentanone derivatives, formed from further rearrangement. If, however, tributyl phosphine was employed as initiator, the polymers were mostly made up of conjugated ketoolefinic units. IR, NMR and mass spectrometric measurements were carried out to determine the structure of the polymers. Existence of the macro zwitterions was proved by high voltage electrophoresis.The semi-conductor properties of the polymers containing conjugated ketoolefinic units are discussed.Spectroscopic investigation of the kinetics of the triphenyl phosphine initiated polymerization of maleic anhydride showed that the initiation reaction of the ylide, formed with the monomer, proceeded about 90 times slower than the propagation reaction due to addition of the monomer to the growing chain-end.
    Additional Material: 8 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 153 (1972), S. 125-137 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Maleic anhydride was found to polymerize spontaneously in presence of pyridine bases, triphenylphosphine and tributylphosphine. The formation of two characteristic types of structural elements during this polymerization can be explained with the aid of a reaction model. Analytical data (IR, NMR, and ESR spectroscopy, titrations) are given to characterize the structural elements of the polymers. Their compounds of degradation have been partially isolated and characterized.
    Notes: In Gegenwart von Pyridinbasen, von Triphenylphosphin oder Tributylphosphin polymerisiert Maleinsäureanhydrid spontan. Anhand eines Reaktionsmodelles wird die Bildung der beiden charakteristischen Strukturelemente in diesen Maleinsäureanhydridpolymerisaten erklärt. Die Strukturelemente der Polymeren wurden durch die analytischen Daten (IR-, NMR-, ESR-Spektroskopie, Titrationen) belegt. Zum Teil wurden die Abbauprodukte isoliert und identifiziert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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