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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 41 (1983), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: It was recently claimed that lysolecithin (lysophosphatidylcholine) in chromaffin granules is a postmortem artefact. We have, therefore, determined catecholamine/lysolecithin ratios in adrenal tissues and isolated chromaffin granules. In rat adrenals and bovine medulla the ratios in both tissues and granules were similar. This indicates that even in rapidly frozen rat adrenal glands, sufficient lysolecithin is present in the total tissue to account for its presence in isolated organelles. Owing to the high cortex/medulla ratios such studies cannot be performed with guinea pig or rabbit adrenals. However, isolated chromaffin granules from guinea pig, in contrast to a previous study, do contain lysolecithin. We conclude that lysolecithin is an in vivo constituent of chromaffin granules of all species so far investigated.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 93 (1982), S. 329-348 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract It is shown that a system ofr homogeneous cubic equations with rational coefficients has a nontrivial solution in rational integers if the number of variables is at least (10r)5. For most such systems, an asymptotic formula holds for the numberz P of solutions whose components have modulus 〈P.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 93 (1982), S. 63-74 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Hua andChen gave estimates of sums $$\sum\limits_{x = 1}^q {e(\mathfrak{F}(x))} $$ wheree(z)=e 2πiz and $$\mathfrak{F}$$ is a polynomial of the typef(x)/q wheref(x)=a k x k +...+a 1 x with integer coefficients having gcd (q, a k ,...,a 1)=1 But no good estimates hold for these sums whenq is small in comparison tok. We therefore consider here a related but different class of polynomials. Special emphasis is given to the cubic case. In subsequent papers of this series we shall deal with cubic exponential sums in many variables and withp-adic and rational zeros of systems of cubic forms.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 28 (1929), S. 545-554 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 93 (1982), S. 211-223 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We study systems of equations $$\mathfrak{F}_1 = \ldots = \mathfrak{F}_r = 0,$$ where $$\mathfrak{F}_1 , \ldots ,\mathfrak{F}_r $$ are cubic forms withp-adic coefficients. Such a system has a nontrivialp-adic solution if the number of variables is at least 50,000 ·r 3. Further we will give estimates for the number of solutions of certain systems of cubic congruences.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 93 (1982), S. 141-168 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Letf(x 1,...,x s ) be a cubic polynomial with integer coefficients,q a prime power, ande(z)=e 2πiz . We are going to estimate sums $$\sum\limits_{x_1 = 1}^q { \cdot \cdot \cdot } \sum\limits_{x_S = 1}^q {e(q^{ - 1} f(x_1 ,...,x_S ))} $$ , as well as generalizations of such sums.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 90 (1980), S. 45-65 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The main result is thatr quadratic forms in more than 4r 2+4r variables possess a common nontrivialp-adic zero.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Beide Muskelrezeptoren an der Mandibel von Leuctra ziehen vom vorderen Tentorium-Arm zur Mandibel-Basis. Der ventrale Rezeptor besteht aus zwei dünnen Muskelfasern (6 bis 7 μm Durchmesser) und mindestens 10 multiterminalen Sinneszellen, deren Dendriten sich im Innern der Fasern verzweigen und an den Z-Scheiben enden. Der dorsale Rezeptor besitzt drei ähnlich dünne Muskelfasern, aber nur eine einzelne multiterminale Sinneszelle. Ihre Dendriten enden im Ansatzgebiet des Muskels, zwischen Muskelfasern und Epidermiszellen. Beide Rezeptoren haben im wesentlichen denselben Feinbau wie bei Coleopteren, jedoch treten — besonders beim dorsalen Rezeptor — in den Dendriten-Enden Strukturen auf, die den Tubularkörpern bei Mechanosensillen ähneln.
    Notes: Summary The muscle receptor organs of the mandible of Leuctra extend between the anterior tentorial arm and the mandible base. The ventral receptor is composed of two thin muscle fibres (6–7 μm in diameter) and at least ten multiterminal sensory cells, the dendrites of which branch in the interior of the fibres and end near the z-bands. The dorsal receptor organ consists of three muscle fibres of similar diameter and only one multiterminal sensory cell. The dendritic ends lie at the distal end of the muscle, where muscle fibres and epidermal cells make contact. Both receptor organs essentially show the same ultrastructural characteristics as in Coleoptera. However, the dorsal receptor organ in particular possesses organelles in its dendritic ends, which look like the tubular bodies in ciliary mechanoreceptors.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 315 (1983), S. 687-690 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach Abtrennen des größten Teiles des in den Bodenaufschlüssen vorhandenen Eisens mit Acetylaceton/Chloroform wird Thallium durch eine Extraktion mit APDC/MIBK (Ammoniumpyrrolidin/Methylisobutylketon) mit anschließender Reextraktion mit Salpetersäure angereichert. Das Abtrennen des Eisens ist notwendig, um Störungen zu vermeiden. Nach der oben erwähnten Behandlung der Aufschlußlösungen können keine Störungen durch Begleitionen auf die Absorption des Thalliums beobachtet werden, jedoch nur dann, wenn Zirkonium-beschichtete Graphitrohre als Absorptionsvolumina verwendet werden. Wiederfindungsversuche bestätigten den quantitativen Verlauf von Extraktion und Reextraktion des Thalliums. Als Nachweisgrenze für Thallium wurde eine Konzentration von 0,007 mg/l ermittelt. Thallium wird um den Faktor fünf angereichert. Mit dem angegebenen Verfahren können neben Thallium, gleichgültig, ob es in ein- oder dreiwertiger Form vorliegt, auch noch Cd, Pb, Co und Ni bestimmt werden.
    Notes: Summary After removing the major part of iron from digested soil solutions by an extraction with acetylacetone/chloroformium, thallium is enriched by an extraction with APDC/MIBK (ammoniumpyrrolidine/methylisobutylketone) and subsequent reextraction with nitric acid. The preliminary separation of iron is necessary in order to avoid interferences. After the above mentioned treatment of the solutions no interferences of thallium by accompanying ions can be observed, if the analyses are carried out in zirconium coated graphite tubes. Investigations of recoveries confirmed that extraction and reextraction of thallium were quantitative. Detection limits were found to be 0.007 mg Tl/l reextract. Thallium is enriched by a factor of five. Besides thallium (in mono- or trivalent state), Cd, Pb, Co and Ni can be determined with the same procedure.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular histology 15 (1983), S. 301-302 
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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