Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Circadian changes in microtubules, synaptic ribbons and synaptic ribbon fields in the pinealocytes of the baboon (Papio ursinus) (1981)
    Springer
    Cell & tissue research 217 (1981), S. 405-413 
    Details
    ISSN: 1432-0878
    Keywords: Baboon pineal gland ; Microtubules ; Synaptic ribbons ; Circadian rhythm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In baboons kept under controlled lighting conditions, microtubules (MT) are readily seen in the perikaryal cytoplasm and in the perivascular processes of pinealocytes. A significant increase in the number of MT, single synaptic ribbons (SR) and the formation of synaptic ribbon fields (RF, i.e. organelles which consist of multiple dense rodlets or plates, and vesicles), occur during the dark phase of a circadian light-dark cycle. MT may act as “tracks” for the oriented flow of vesicles derived from the smooth endoplasmic reticulum, to cytoplasmic sites where RF are being formed. The origin of the dense rodlets of RF remains unknown. Structural differences between SR and RF indicate that the latter organelles are not directly involved in impulse propagation between adjacent baboon pinealocytes. RF may function as storage organelles for some of the pineal secretory products which are formed in large amounts during the dark phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233590
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Selenbestimmung im μg/g- und ng/g-Bereich in anorganischen und organischen Matrices nach Verdampfungsanalyse im dynamischen System durch AAS (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 305 (1981), S. 1-10 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Selen in Anorgan. Material, Organ. Material ; Spektrometrie, Atomabsorption ; Verdampfung im dynam. System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine spezielle Apparatur zur Abtrennung von Selengehalten aus anorganischen (≥ 0,5 ng/g) und organischen (≥ 2 ng/g) Matrices beschrieben, die eine zuverlässige Bestimmung der isolierten Selenspuren durch Hydrid-AAS (HG-AAS) bzw. AAS mit elektrothermischer Atomisierung (ETA-AAS) ermöglicht. Beim Aufschluß der Probe im O2- bzw. Ar/O2-Trägergasstrom wird das Selen in einem Quarzsystem als SeO2 verflüchtigt und in einer Vorlage zusammen mit dem Sauerstoff und anderen flüchtigen Substanzen durch Kühlen mit flüssigem Stickstoff kondensiert. Die Leistungsfähigkeit des Verbundverfahrens wird durch zahlreiche Se-Bestimmungen in Metallen, Gesteinen, Sedimenten, Böden, pflanzlichen und tierischen Matrices belegt.
    Notes: Summary A special apparatus for the separation of low levels of selenium from inorganic (≥ 0.5 ng/g) and organic (≥2 ng/g) matrices is described. It enables a reliable determination of the isolated traces of selenium by hydride-AAS (HG-AAS) or AAS with electrothermal atomisation (ETA-AAS). During decomposition of the sample in a stream of O2 or Ar/O2 in a quartz system, selenium is volatilized as SeO2 that is subsequently trapped simultaneously with oxygen and other volatile substances by cooling with liquid nitrogen. The capability of this multi-stage procedure is proved by numerous determinations of Se in metals, rocks, sediments, soils, plant and animal matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00491604
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Molecular mechanics of organic halides. V. Conformational equilibria in solution (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 2 (1981), S. 384-391 
    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: With a view of using data on solutions and liquids for parameter fitting in molecular mechanical force fields, Abraham's theory of solvation is incorporated in the force field procedure. Geometries and bond moments are estimated internally, partial account being taken of bond-bond induction, and used to calculate the intramolecular electrostatic energy, dipole moment, and the dipole and quadrupole terms in the solvation energy. Three dielectric constants are used, one for the solute in the vapor, one for the solution, and one for the intramolecular space through which dipole-dipole interactions take place. Examples are given, including such where computation differs with measurement, to illustrate the performance of the scheme.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540020405
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...