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  • 1
    Electronic Resource
    Electronic Resource
    Development of a photosynthesis model with an emphasis on ecological applications (1980)
    Springer
    Oecologia 45 (1980), S. 147-155 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A physiologically based steady-state model of whole leaf photosynthesis (WHOLEPHOT) is used to describe net photosynthesis daily time courses in Prunus armeniaca. Net photosynthesis rates are calculated in response to incident light intensity, leaf temperature, air carbon dioxide concentration, and leaf diffusion resistance measured at five minute intervals. The steady-state calculations closely approximate the observed net photosynthesis rates for a broad range of weather conditions and leaf stomatal behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346453
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The diurnal time course of net photosynthesis of soybean leaves: Analysis with a physiologically based steady-state photosynthesis model (1980)
    Springer
    Oecologia 46 (1980), S. 314-321 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A physiologically based steady-state model of whole leaf photosynthesis (WHOLEPHOT) is used to analyze observed net photosynthesis daily time courses of soybean, Glycine max (L.) Merr., leaves. Observations during two time periods of the 1978 growing season are analyzed and compared. After adjustment of the model for soybean, net photosynthesis rates are calculated with the model in response to measured incident light intensity, leaf temperature, air carbon dioxide concentration, and leaf diffusion resistance. The steady-state calculations closely approximate observed net photosynthesis. Results of the comparison reveal a decrease in photosynthetic capacity in leaves sampled during the second time period, which is associated with decreasing ability of leaves to respond to light intensity and internal air space carbon dioxide concentration, increasing mesophyll resistance, and increasing stomatal resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346258
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Midday stomatal closure in Arbutus unedo leaves in a natural macchia and under simulated habitat conditions in an environmental chamber (1980)
    Springer
    Oecologia 47 (1980), S. 365-367 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398530
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Pathogenese der Diuretika-induzierten Hyperlipoproteinämie (1980)
    Springer
    Journal of molecular medicine 58 (1980), S. 359-363 
    Details
    ISSN: 1432-1440
    Keywords: Diuretic therapy ; Secondary hyperlipoproteinemia ; Low density lipoproteins ; High density lipoproteins ; Apoproteins B, A1 and A2 ; Diuretika ; Sekundäre Hyperlipoproteinämie ; Lipoproteine niedriger Dichte ; Lipoproteine hoher Dichte ; Apoproteine B, A1 und A2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Abklärung von Ausmaß und Pathogenese der Diuretikainduzierten sekundären Hyperlipoproteinämie wurden bei 12 Probanden die Serumlipide und -lipoproteine, die Apoproteine A1, A2 und B sowie die lipolytischen Enzyme Lipoproteinlipase und hepatische Triglyzeridlipase nach einer vierwöchigen Placeboperiode und nach 6 Wochen Behandlung mit Chlorthalidon untersucht. Außer einem signifikanten Anstieg der atherogenen low density Lipoproteine (LDL), (der LDL-Cholesteringehalt nahm um 18% zu,P〈0,05) waren keine signifikanten Lipoproteinveränderungen faßbar. Insbesondere blieb die high density Lipoprotein-Konzentration sowohl gemessen am HDL-Cholesteringehalt wie an den beiden Apoproteinen A1 und A2 nahezu unverändert. Der leichte statistisch nicht signifikante Anstieg der Serumtriglyzeride war begleitet von einer ebenso wenig signifikanten Zunahme der Aktivität der Lipoproteinlipase und der hepatischen Triglyzeridlipase. Pathogenetisch dürfte der sekundären Hyperlipoproteinämie unter Chlorthalidon am ehesten eine Abbaustörung der LDL zugrunde liegen.
    Notes: Summary In order to study the degree and pathogenic aspects of the secondary hyperlipoproteinemia in patients under diuretic therapy we measured serum lipids, lipoproteins and the apoproteins A1, A2 and B in 12 adults after a 4 weeks placebo period and 6 weeks of treatment with chlorthalidon. There was a significant increase in atherogenic low density lipoproteins (LDL), (18%,P〈0.05) whereas the high density lipoprotein-cholesterol, Apo A1 and A2 levels were not significantly altered. The same was true for the total serum triglyceride- and the very low density lipoprotein- and LDL-triglyceride levels. The activity of lipoprotein lipase and hepatic triglyceride lipase was slightly but not significantly increased. A delayed LDL-catabolism seems to be the most probable pathogenic mechanism underlying the Chlorthalidon-induced hyperlipoproteinemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01477278
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  • 5
    Electronic Resource
    Electronic Resource
    Isokinetic and static plantar flexion characteristics (1980)
    Springer
    European journal of applied physiology 45 (1980), S. 221-234 
    Details
    ISSN: 1439-6327
    Keywords: Human ; Physiology ; Strength ; Isokinetic ; Isometric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Isokinetic and static maximum plantar flexion torques were measured in 135 adults with sedentary professions. Close associations between isokinetic and static peak torques were found. Between the ages 20–49 years strength did not differ. Thereafter strength declined as a function of age. Maximum strength was 35% lower in females than in males. The right plantar flexion strength was slightly lower than the left. Maximum plantar flexion strength was about 15% lower with flexed than with extended knees. A negative exponential model characterized the decline of strength as a function of increased isokinetic velocity of angular motion. Seventy per cent or more of the variations in maximum static and isokinetic strength could be explained by anthropometric variables and by age, and by the extent of physical activity in subjects younger than 50 years. Formulas for estimation of expected static and isokinetic strengths are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421330
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Systematische Fehler bei der Selenbestimmung im ng/g-Bereich in biologischen Matrices nach dem Hydrid-AAS-Verfahren (1980)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 300 (1980), S. 18-21 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Selen in Biolog. Material ; Spektralphotometrie ; Atomabsorption ; Hydridverfahren ; Systemat. Fehler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Vier biologische Standardreferenz-substanzen (NBS und IAEA) werden mit zwei unterschiedlichen Aufschlußmethoden, einem Naßaufschluß mit einem HNO3/HClO3/HClO4-Gemisch nach optimiertem Temperatur-Zeit-Programm sowie einer Verbrennungsmethode im Sauerstoffstrom (Trace-O-Mat), mineralisiert und die Selengehalte der Aufschlußlösungen nach der Hydrid-AAS-Methode bestimmt. Dabei treten gegenüber den zertifizierten Selengehalten mit zunehmender Einwaage Minusbefunde auf, die — von den Aufschlußmethoden unabhängig — auf sich addierende Querstörungen durch Begleitelemente im μg/g-Bereich bei der Selenhydridbildung zurückzuführen sind, wie bereits an anderer Stelle [3] beschrieben wurde.
    Notes: Summary Four biological standard-reference materials (NBS and IAEA) were mineralized with two independent decomposition methods — a wet decomposition with a mixture of HNO3/HClO3/HClO4 using an optimized temperature-time programme, and a combustion method in an oxygen stream (Trace-O-Mat). The selenium contents of the decomposition solutions were determined by the hydride-AAS method. The selenium concentrations were in agreement with the certified values at low sample weights, but decreased as the sample weights were increased. This effect is independent of the decomposition method, but is caused by interferences of concomitant elements in the μg/g-range with the formation of selenium hydride, as has been previously discussed [3].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498709
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular mechanics of organic halides. III. Fluorinated olefins (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 1 (1980), S. 111-117 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A molecular mechanical force field for fluorinated ethylenes and propylenes is described. The field computes geometries, dipole moments, and energy differences between isomers and rotamers. Component analysis indicates that “classical” strains alone (skeletal, nonbonded, electrostatic) cannot account for energy relationships. The discussion is supplemented by a semiempirical quantum chemical comparison of cis- and trans-FCH=CHF and of gauche- and anti-FCH2CH2F.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540010202
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    Paper (German National Licenses)
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