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  • 1
    Electronic Resource
    Electronic Resource
    Is Lysolecithin an In Vivo Constituent of Chromaffin Granules? (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 41 (1983), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1471-4159.1983.tb00848.x
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  • 2
    Electronic Resource
    Electronic Resource
    Role of PACAP in the Regulation of Gastrointestinal Motility (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 805 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17497.x
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of Novel Growth-related Genes Linked to the Mitogenic Effect of PACAP on the Rat Pancreatic Acinar Cell Line, AR4-2J (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 805 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17554.x
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  • 4
    Electronic Resource
    Electronic Resource
    Pyridine nucleotide pool size changes in iron-deficient Plantago lanceolata roots during reduction of external oxidants (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 98 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The involvement of pyridine nucleotides in the reduction of extracytoplasmatic electron acceptors by iron-deficient Plantago lanceolata L. roots has been examined by measuring the changes in NAD(P)H and NAD(P)− induced by various external acceptors. Exposure of the plants to FeEDTA, ferricyanide, ferric citrate or hexachloroiri-date resulted in a transient decrease in NADPH and an increase in NAD−. No major differences in this pattern were observed between acceptors which were assumed to be reduced by different enzymes. The application of the membrane-permeable oxidant nitro blue tetrazolium led to similar changes in reduced and oxidized pyridine nucleotides and decreased the reduction of external acceptors. The amino acid analog p-fluorophenylalanine caused a transient decline in both NADPH level and NADPH/ NADP− ratio and a decrease in the ratio of NADH to NAD− without affecting the level of NADH. Exposure of the plants to the translation inhibitor cycloheximide increased both NADH and NADPH concentrations. A comparison of the redox activities and pyridine nucleotide fractions after inhibitor treatment revealed that the constitutive, but not iron stress-induced redox activity correlates with NADPH levels. These results are interpreted as confirming that the redox systems on the root plasma membrane are separately regulated. Possible metabolic reactions during the reduction processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00695.x
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  • 5
    Electronic Resource
    Electronic Resource
    Reduction of root iron in Plantago lanceolata during recovery from Fe deficiency (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 98 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Changes in root-associated Fe(III) reductase activity and Fe concentration during recovery from temporary iron starvation were investigated in hydroponically grown Plantago lanceolata L. Within two days, interruption of the Fe supply resulted in enhanced rates of reduction by intact plant roots. Transfer of iron deficient plants to a solution containing various amounts of chelated Fe caused a transient increase in reduction activity before the rates declined to a level determined by the amount of Fe added. Repression of root-associated redox activity was independent of the Fe concentration in the preculture. When iron deficient plants were submitted to a supply of Fe localized to a part of the root system (split-root plants), the decrease in reduction rates was much more pronounced in the Fe-deprived portion of the roots than in the Fe-supplied one. No correlation was observed between root Fe concentration and Fe(III) reductase activity. Continued growth of split-root plants in the +Fe/-Fe regime increased the reduction rates of the +Fe-grown portion of the root system over the rates in iron sufficient plants with non-divided roots. The results are discussed in relation to putative factors mediating intra- and interorgan regulation of iron nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb05715.x
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  • 6
    Electronic Resource
    Electronic Resource
    The distribution of sublattices of ℤ m (1998)
    Springer
    Monatshefte für Mathematik 125 (1998), S. 37-81 
    Details
    ISSN: 1436-5081
    Keywords: 11H06 ; 11H99 ; 11H55 ; Distribution of lattices ; generalized upper half plane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Lattices Λ, Λ′ are similar if one can be transformed into the other by an angle-preserving linear map. Similarity classes of lattices of rankn may be parametrized by a fundamental domainℱ of the action ofGL n (ℤ) on the generalized upper half-plane ℋ n . Given 1〈n≤m and , letN(D,T) be the number of sublattices of ℋ n which have rankn, similarity class inD, and determinant ≤T. Our most basic result will be thatN(D,T)∼c 1(m, n)μ(D)T m asT→∞ for suitable setsD, where μ is the invariant measure on ℋ n . The casen=2 had been dealt with by Roelcke and by Maass using the theory of modular forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01489457
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  • 7
    Electronic Resource
    Electronic Resource
    On cubic polynomials (1982)
    Springer
    Monatshefte für Mathematik 93 (1982), S. 329-348 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01295233
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  • 8
    Electronic Resource
    Electronic Resource
    On cubic polynomials I. Hua's estimate of exponential sums (1982)
    Springer
    Monatshefte für Mathematik 93 (1982), S. 63-74 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01579030
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  • 9
    Electronic Resource
    Electronic Resource
    Appendix to "Approximation of viscosity solutions of elliptic partial differential equations on minimal grids", by M. Kocan: Approximation to orthogonal bases in ${\Bbb R}^n$ by orthogonal bases with integer coordinates (1995)
    Springer
    Numerische Mathematik 72 (1995), S. 117-122 
    Details
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991):11H06
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. In the Appendix it is shown that given $N〉1$ , an orthogonal basis $\underline{\underline {\varphi_1}},\dots, \underline{\underline{\varphi_n}}$ of ${\Bbb R}^n$ where $n\ge4$ can be approximated by an orthogonal basis $\underline{\underline{a_1}},\dots, \underline{\underline{a_n}}$ with integer components such that the angle between $\underline{\underline{\varphi_i}}$ and $\underline{\underline{a_i}}$ is at most $1/N$ $(i=1,\dots,n)$ , and $\underline{\underline {a_1}},\dots, \underline{\underline{a_n}}$ have norms $\ll N^{2n-4}$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002110050162
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  • 10
    Electronic Resource
    Electronic Resource
    On cubic polynomials III. Systems ofp-adic equations (1982)
    Springer
    Monatshefte für Mathematik 93 (1982), S. 211-223 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01299298
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