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  • 1985-1989  (9)
  • 1900-1904
  • 1800-1809
  • Didactic fiction., gsafd
  • Key words
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 28 (1989), S. 211-224 
    ISSN: 1436-6215
    Keywords: Klinische Ernährungstherapie ; Aminosäurenlösungen,Aminogramme ; Key words ; Clinical nutrition ; amino acids, analytical interpretation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The high value of clinical nutrition as an important component in polypragmatic therapy of severely ill patients with increasing age and restricted compensatory capacity is today unquestioned. The areas of interest and applications have reached a high degree of complexity by many differentiations. The metabolic interrelations under pathological conditions influence especially the application of amino acids. By the enormously increased standards of analytical procedures and instruments huge amounts of data have been gathered but methods and tools for interpreting the complex analytical results have not been developed to the same degree. Considering physiological, pathological biochemical, and biophysical alterations, this review discusses application of amino acids, evaluation and interpretation procedures, as well as indications, contraindications, and effective monitoring. The important regulatory function of the liver in connection with the urea production rate, and the physiological pattern and concentrations of amino acids in plasma are both discussed in detail. Also discussed is the therapeutic advantage of determining total concentration and relative composition of the amino acid pool in plasma, especially in severely ill patients.
    Notes: Zusammenfassung Der hohe Stellenwert der klinischen Ernährungstherapie ist in der heutigen polypragmatischen Therapie schwerstkranker und zum Teil sehr alter Patienten mit eingeschränkter Kompensationsfähigkeit unbestritten. Das Einsatzfeld der klinischen Ernährungstherapie hat dadurch eine starke Differenzierung und einen hohen Komplizitätsgrad erreicht. Diese Wechselbeziehung des pathologischen Ablaufs im Stoffwechsel nach äußeren und inneren Belastungen und den einzelnen Substraten betrifft im hohen Maße die Anwendung von Aminosäuren. Durch die enorme Zunahme der analytischen Leistungsfähigkeit ist das Erkenntnismaterial im Bereich der Aminosäurenversorgung zwar stark angewachsen, aber die Interpretation des komplexen Zusammenhangs der Aminosäuren keineswegs in gleicher Weise verbessert worden. In der vorliegenden Arbeit wird auf dem grobskizzierten Hintergrund physiologischer und pathologischer Stoffwechselzusammenhänge der Einsatz von Aminosäuren dergestalt abgehandelt, daß über eine plausible Interpretation der komplexen analytischen Daten die Indikation, Kontraindikation und überwachung der Aminosäurenapplikation verständlich wird. Vor allem die Bedeutung der Regulation durch die Leber, der Zusammenhang mit der Harnstoffproduktionsrate sowie die differente Bedeutung der mikromolaren und relativen Aminosäurenmuster im Plasma werden so abgehandelt, daß sie für die Interpretation auch schwerkranker Zustände herangezogen werden können.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1536
    Keywords: Key words ; Viscosity ; water structure ; albumin ; acetyisalicylic acid ; lysine chloride ; ascorbic acid ; dextrane ; sorbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Viscosity measurements were made in the temperature range of 10 °–40 °C. The equationν=ν o exp(B/(T-T o )) was used with the parameterT 0 as “structure indicator”, which is called the “limiting temperature”. For instance, hydrocarbons, as liquids with “quasifree” molecules, haveT 0=O; water as a highly structured liquid hasT 0= 140–150 K. The polymer investigated was ovalbumin in aqueous solution in a concentration comparable to that of blood. Acetylsalicylic acid produces a protein conformation which breaks the water structure in solution at a pH of within the in vivo region. The question of whether only the acidity determines the water structure breaking properties of the protein is investigated by acidifying albumin-water solutions with hydrochloric acid, lysine chloride and ascorbic acid. All these acids exhibit similar effects. A stronger influence is observed for ammonium chloride. Its interaction with ovalbumin produces a strong structure-breaking effect. The most powerful water structure breaker in albumin-water solutions is dextrane. In a concentration of 10 % it changes the polymer conformation so that the water structure is broken to such an extent that the solution behaves as an almost “quasifree” liquid withT 0=O.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Computing 38 (1987), S. 177-184 
    ISSN: 1436-5057
    Keywords: 65D07 ; Key words ; Approximation over the sphere ; tensor product splines ; spherical harmonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir konstruieren eine berechenbare Funktion, die auf der Kugeloberfläche definiert und mindestensC 1 ist und die eine vorgegebene Datenmenge approximiert. Die Konstruktion beruht auf Tensorprodukt-Spline-Basisfunktionen; an den Polen des sphärischen Koordinatensystems benutzen wir modifizierte Basisfunktionen in Analogie zu sphärischen harmonischen Entwicklungen, um die Glattheit an diesen Stellen zu bewahren. Konvergenzexperimente mit Verfeinerung der Gitter wurden durchgeführt und die Ergebnisse mit ähnlichen in der Literatur verglichen. Die Verwendung stückweiser Approximationen mit lokalen Basisfunktionen wird der Approximation mit sphärischen Harmonischen gegenübergestellt und die Approximationsgüten werden verglichen.
    Notes: Abstract A computable function, defined over the sphere, is constructed, which is of classC 1 at least and which approximates a given set of data. The construction is based upon tensor product spline basisfunctions, while at the poles of the spherical system of coordinates modified basisfunctions, suggested by the spherical harmonics expansion, are introduced to recover the continuity order at these points. Convergence experiments, refining the grid, are performed and results are compared with similar results available in literature. The approximation accuracy is compared with that of the expansion in terms of spherical harmonics. The use of piecewise approximation, with locally supported basisfunctions, versus approximation with spherical harmonics is discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 146 (1987), S. 61-62 
    ISSN: 1432-1076
    Keywords: Key words ; Prostaglandin E1, E2, F2α and I2 (prostacyclin) ; Cerebral artery ; Mesenteric artery ; Baboons/primate animals ; Premature newborns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Responses to prostaglandins (PGs) E1, E2, F2α and I2 at a wide range of concentrations were compared in the cerebral and mesenteric arteries isolated from premature newborn baboons. PGE1 at low concentrations relaxed the cerebral artery but not the mesenteric artery. PGI2 produced a relaxation of similar magnitude in both arteries. PGF2α in high concentrations produced a much greater contraction in the mesenteric artery than in the cerebral artery. Thus, during the perinatal stage, the baboon cerebral artery has distinctive PG-reactivity compared to the extracerebral artery. Clinical use of PGE1 or indomethacin may result in circulatory derangement or redistribution of blood flow in the cerebral and mesenteric circulations, and may produce side effects of these drugs.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 11 (1987), S. 253-264 
    ISSN: 1573-5079
    Keywords: Key words ; drought ; nitrogen content ; photosynthesis ; respiration ; stomata ; water relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Potatoes (Solanum tuberosum L., cv. Bintje) were grown in a naturally lit glasshouse. Laboratory measurements on leaves at three insertion levels showed a decline with leaf age in photosynthetic capacity and in stomatal conductance at near saturating irradiance. Conductance declined somewhat more with age than photosynthesis, resulting in a smaller internal CO2 concentration in older relative to younger leaves. Leaves with different insertion number behaved similarly. The changes in photosynthesis rate and in nitrogen content with leaf age were closely correlated. When PAR exceeded circa 100 W m−2 the rate of photosynthesis and stomatal conductance changed proportionally as indicated by a constant internal CO2 concentration. The photosynthesis-irradiance data were fitted to an asymptotic exponential model. The parameters of the model are AMAX, the rate of photosynthesis at infinite irradiance, and EFF, the slope at low light levels. AMAX declined strongly with leaf age, as did EFF, but to a smaller extent. During drought stress photosynthetic capacity declined directly with decreasing water potential (range −0.6 to −1.1 MPa). Initially, stomatal conductance declined faster than photosynthetic capacity.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 57-67 
    ISSN: 1436-5057
    Keywords: 65L ; Key words ; Convection-diffusion ; upwind finite differencing ; singular perturbation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir analysieren ein spezielles upwind-Differenzenschema für ein gewöhnliches, nichtlineares, singulär gestörtes Randwertproblem. Es wird insbesondere gezeigt, daß die Lösung des diskreten Problems eindeutig ist sowie monoton von der rechten Seite abhängt. Im globalen Gebiet ist die Methode von zweiter Ordnung.
    Notes: Abstract We analyze a special finite difference scheme of upwind type for an ordinary singularly perturbed nonlinear boundary value problem. In particular we prove the uniqueness and monotone dependence upon the right hand sides of the discrete solutions and the second order accuracy in the global domain.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 81-90 
    ISSN: 1436-5057
    Keywords: 65H10 ; Key words ; Systems of nonlinear equations ; Newton's method ; monotone convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Neue hinreichende Bedingungen für die monotone Konvergenz der Newton-Methode für die Lösung nichtlinearer Gleichung werden gegeben. Diese Bedingungen sind affin-invariant und allgemeiner als die Voraussetzungen des Satzes von Baluev.
    Notes: Abstract New sufficient conditions for the monotone convergence of Newton's method for solving nonlinear systems of equations are given. These conditions are affine-invariant and less restrictive than the hypothesis of Baluev's theorem.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta applicandae mathematicae 4 (1985), S. 1-14 
    ISSN: 1572-9036
    Keywords: 47H17 ; 82A45 ; Key words ; Plasma physics ; free boundary problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Under a few assumptions on the functiong, we prove the existence of the following-free boundary problem: Findu inH 2(Ω) satisfying: $$\begin{gathered} \Delta u \in g(x, u(x)), [\delta (u)(x), \bar \delta (u)(x)] in \{ u〈 0\} \hfill \\ \Delta u = 0 in \{ u \geqslant 0\} \hfill \\ u = constant (but unknown) on the boundary \partial \Omega of \Omega \hfill \\ \int_{\partial \Omega } {\frac{{\partial u}}{{\partial n}}d\sigma = I 〉 0} (given number) \hfill \\ \end{gathered} $$ where $$\delta (u)(x) = meas \{ y \in \Omega , u(x)〈 u(y)〈 0\} ,\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{\delta } (u)(x) = meas\{ y \in \Omega , u(x) \leqslant u(y) \leqslant 0\} $$ . This is a model of the Grad-Mercier-type describing the equilibrium of a confined plasma in a Tokamak machine.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 5 (1985), S. 69-76 
    ISSN: 1573-5028
    Keywords: Key words ; cetyltrimethylammonium bromide ; CTAB
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have developed a DNA extraction procedure for milligram amounts of plant tissue. Yields ranged from 0.3–200 nanograms of DNA per milligram of tissue. The factors affecting yield are discussed. Fresh tissue, as well as herbarium specimens (22–118 years old) and mummified seeds and embryos (500 to greater than 44 600 years old) were used. All tissues attempted (57 types from 29 species) yielded measurable amounts of DNA. In no case tested was inhibition observed for restriction enzymes BamHI or EcoRI.
    Type of Medium: Electronic Resource
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