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  • 1
    Electronic Resource
    Electronic Resource
    Second order Møller–Plesset perturbation theory without basis set superposition error (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 3360-3373 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A second order Møller–Plesset perturbation theory which is free of the basis set superposition error (BSSE) is developed based on the "Chemical Hamiltonian Approach" (CHA). The zeroth order Hamiltonian is built up on the BSSE-free (but not orthogonal and not necessarily real) canonic CHA–SCF orbitals and their orbital energies. As the exclusion of BSSE makes the problem nonHermitian, biorthogonal perturbation theory is used to obtain the first order wave function. The second order energy is, however, calculated by using the conventional Hermitian Hamiltonian, in accord with the "CHA with conventional energy" recipe. For that reason we use a generalized Hylleraas functional introduced recently; this guarantees the second order energy to be real even in the case of complex CHA–SCF orbitals. The matrix elements entering the generalized Hylleraas functional are calculated by transforming all wave functions, creation and annihilation operators to an auxiliary orthonormalized basis. The new CHA-MP2 method has been tested on a number of van der Waals complexes and hydrogen bonded systems, by using a variety of different basis sets. In all cases a remarkable agreement has been found with the results given by the Boys and Bernardi's counterpoise method (CP); this agreement is especially striking in the case of large and well-balanced basis sets. This indicates that the conceptually different CHA and CP schemes both take into account correctly the major BSSE effects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476931
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  • 2
    Electronic Resource
    Electronic Resource
    Diel plasma melatonin profile in a cyclostome, the river lamprey (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 53 (1998), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Plasma melatonin levels in adult river lampreys Lampetra fluviatilis, sampled during their upstream migration showed a pronounced diel profile, with high levels during the night and lower levels during the day, showing that a cyclostome, in common with other vertebrates, exhibits such a diel plasma profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1998.tb01846.x
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  • 3
    Electronic Resource
    Electronic Resource
    Plasma concentrations of sex steroids and fighting in male Tilapia zillii (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 54 (1999), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In laboratory-held Tilapia zillii the gonadosomatic index (IG) is an accurate predictor of dominance in pairwise fights between males. Immediately after fighting no differences were detected between winners, losers or controls, in plasma concentrations of testosterone (T) or 11-ketotestosterone (11KT). 11KT was correlated negatively with IG and positively with T. 11KT appeared to be the major androgen in this species, but there was no evidence that simple differences in levels of these sex steroids mediated aggressive behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1999.tb00649.x
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  • 4
    Electronic Resource
    Electronic Resource
    Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 53 (1998), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Changes in plasma concentrations of sex steroids, growth rate and condition of repeat spawning (3+) male and female Arctic charr were studied throughout an annual reproductive cycle. Individually marked fish (mean weight approx. 500 g) were held under conditions of liberal food supply, constant temperature (4° C) and simulated natural photoperiod (Tromsø, 70° N). Once each month fish were weighed, measured and blood samples taken for steroid analysis. Plasma concentrations of testosterone (T), 11-ketotestosterone (11-KT) and oestradiol-17β (E2) were determined using radioimmunoassay (RIA). Both male and female fish displayed distinct seasonal changes in plasma concentrations of sex steroids, growth rate and condition. From February (minimal concentrations) to March all sex steroids increased slightly and these elevated concentrations were maintained until May. Thereafter, there was a second, and far more pronounced, increase in plasma steroid concentrations which culminated in peak steroid concentrations in September–October. There was then a rapid decline during the spawning period. In winter, growth rate and condition were generally low, then increased during the spring, reached a peak during the summer, and then declined with the onset of autumn. During spring (March–May), the frequency distributions of plasma testosterone concentrations in both male and female fish were bimodal. The fish of the upper modal group of the distribution had significantly higher growth rates and condition than those in the lower modal group. In summer and early autumn (June–September) the association between T and growth rate changed. Significant negative correlations between T and growth rates were observed in females. There was an increase in endocrine activity, indicated by elevated plasma sex steroid concentrations in March, 7–8 months prior to maturation. It is suggested that this may be one factor influencing the onset of spring growth and energy deposition among maturing charr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1998.tb01827.x
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  • 5
    Electronic Resource
    Electronic Resource
    Gonadal development and sex steroids in a female Arctic charr broodstock (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Gonadal development and plasma levels of sex steroids were investigated in female Arctic charr at 3-week intervals over a 12-month period. Circulating levels of oestradiol-17β (E2), testosterone (T) and 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) were measured by radioimmunoassay, and gonadal status assessed through histological examination and measurement of gonadosomatic index (GSI) and frequency distribution of oocyte size-classes. Gonadal recrudescence during March-July was characterized by modest but insignificant increases in plasma levels of E2 (2–4 ng ml−1) and T (2–5 ng ml−1) and recruitment of oocytes into yolk accumulation. Only a small and insignificant rise in GSI and no apparent increase in oocyte diameter occurred during this period, indicating that the rate of yolk formation and oocyte growth was low. Following transformation from stage V (peripheral yolk granule stage) to stage VI (yolk granule migration stage) in late July, the vitellogenic oocytes entered a phase of rapid growth which resulted in a marked rise in GSI until ovulation commenced in late September. Gonadal growth during this period was accompanied by increases in plasma levels of E2 and T which peaked at 11 ± 1 (mid-August) and 71 ± 5ng ml−1 (late September), respectively. The levels of both steroids dropped rapidly during final maturation and ovulation, followed by a surge in plasma levels of 17,20β-P which peaked at an average of 74 ± 17 ng ml−1 in early October. All three steroids returned to basal levels within a month after ovulation, and all steroids, except E2, remained low until March of the following year. A slight increase in E2 detected in February and March during the second season may have been associated with recruitment into vitellogenesis of a new generation of oocytes. It is suggested that the abrupt increase in vitellogenesis in late July may reflect a condition-dependent decision to proceed with maturation, once the energy reserves have been repleted during spring-early summer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01992.x
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  • 6
    Electronic Resource
    Electronic Resource
    Stimulatory and inhibitory effects of testosterone on testes in Atlantic salmon male parr (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 47 (1995), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Immature 1-year-old Atlantic salmon Salmo salar parr were implanted with Silastic capsules of different sizes filled with testosterone (T). Testosterone had both positive and negative effects on testicular weights, spermatogenesis and steroidogenesis. The positive effects: higher incidence of males with enlarged gonads, spermiation, and high plasma levels of 11-ketotestosterone (11-KT) and 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P), were most pronounced in males treated with small T capsules. The negative effects: suppression of gonadal development and depressed plasma levels of 11-KT and 17,20β-P compared with mature controls, were most evident in fish treated with large T capsules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1995.tb01925.x
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  • 7
    Electronic Resource
    Electronic Resource
    Veränderungen am neuro-vasculären System der Darmwand bie chronischer Obstipation (1951)
    Springer
    Langenbeck's archives of surgery 268 (1951), S. 243-250 
    Details
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung An Hand der histologischen Untersuchungen von 31 Operationspräparaten bei chronischer Obstipation wurden Veränderungen am Nervengewebe und Gefäßapparat der Darmwand beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402801
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Revascularisation des Herzmuskels. (1955)
    Springer
    Langenbeck's archives of surgery 280 (1955), S. 143-153 
    Details
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Durch histologische Untersuchung konnte gezeigt werden, daß die in das Myokard implantierte und seitlich gelochte Arteria mammaria interna über neugebildete Gefäße, die in ihrer Wand reichlich epitheloide Zellen erkennen lassen, Anschluß an kleine Coronararterienäste findet. Das Myokard ist einerseits für die Arteria mammaria interna eine ungewohnte Umgebung und andererseits ist die durch die Arteria mammaria interna angebotene Blutmenge für das gesunde Hundeherz unphysiologisch. Diese beiden Momente werden als Ursache für die besondere Beschaffenheit der anastomosierenden Gefäße verantwortlich gemacht. Ihre Ausbildung erfolgt vermutlich durch nerval gesteuerte Reflexmechanismen im Dienste funktioneller Anpassung, wobei wir uns zu letzterer Annahme auf Grund des histologischen Bildes berechtigt glauben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01440630
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  • 9
    Electronic Resource
    Electronic Resource
    Befunde am Nervenapparat des Magens nach Vagotomie (1957)
    Springer
    Journal of neural transmission 16 (1957), S. 375-383 
    Details
    ISSN: 1435-1463
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Report of 10 cases of stomac resection operated 9 months to 4 years after vagotomy. Beside peptic ulcers, scars after peptic ulcers and chronic gastritis extensive changes in the nervous system of the stomac wall were found. The alterations partly degenerative, partly proliferative were to be distinguished in some points from nervous changes in peptic ulcers, peptic scars and gastritis without vagotomy.
    Abstract: Résumé Rapport de 10 cas de résection gastrique exécutée 9 mois jusqu'à 4 ans après vagotomie. Outre des ulcères et cicatrices peptiques gastriques et duodénaux comme une gastrite chronique, des altérations marquées de l'appareil nerveux de la paroi de l'estomac furent observées. Il s'agissait surtout de changements dégénératifs et prolifératifs nerveux qui se distinguent partiellement des altérations nerveuses en cas d'ulcères et cicatrices peptiques et de gastrite sans vagotomie.
    Notes: Zusammenfassung Bericht über 10 Fälle von Magenresektion nach 9 Monate bis 4 Jahre vorher durchgeführter Vagotomie. Neben peptischen Geschwüren im Magen und Zwölffingerdarm oder Narben nach solchen, bzw. einer chronischen Gastritis ließen sich ausgedehnte Veränderungen am nervösen Apparat der Magenwand feststellen. Es handelte sich im wesentlichen sowohl um degenerative als auch proliferative Erscheinungen am vegetativen Nervensystem, die wir in einzelnen Punkten von denen, wie die in Magenresektionspräparaten ohne vorhergegangene Vagotomie beim Umcus pepticum gefundenen, Narben nach solchen oder bei Gastritis, abtrennen konnten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227265
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  • 10
    Electronic Resource
    Electronic Resource
    Structural analyses of carbonate-containing apatite samples related to mineralized tissues (1995)
    Springer
    Journal of materials science 6 (1995), S. 85-89 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Crystallographic and structural aspects of two carbonate-containing (one with and another without Zn ions) and a pure hydroxyapatite sample were investigated by high resolution electron microscopy. For five different zone axes and for the three samples a good correspondence was always found between simulated lattice images and observed micrographies. Numerous structural defects were detected in the carbonate-containing apatites, whereas none were found in the similarly prepared pure hydroxyapatite. The incorporation of Zn ions in the crystal lattice of the carbonate-containing apatite reduces the number of defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120413
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