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  • 1
    Electronic Resource
    Electronic Resource
    The characteristics of local application of retinoic acid to the regenerating axolotl limb (1985)
    Springer
    Development genes and evolution 194 (1985), S. 228-235 
    Details
    ISSN: 1432-041X
    Keywords: Retinoic acid ; Vitamin A ; Limb regeneration ; Pattern formation ; Axolotls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The work described here is concerned with the effects of local application of retinoic acid to the regenerating limb, administered in silastin blocks. Using 14 C RA we have shown that its rate of diffusion into medium was the same as into regenerating limbs and that the curve of percent loss shows a fast rise tailing off to a plateau. RA caused specific alterations in the proximodistal axis of the regenerate such that complete limbs could be produced from distal amputation planes. Increasing concentrations of RA caused regeneration to commence from increasingly more proximal levels. The effect of time of administration after amputation on proximodistal duplication has been investigated as well as position effects with silastin blocks placed either at the anterior, posterior or dorsal poles of the blastema. These data permitted an estimate of the absolute amount of RA needed to cause alterations in the proximodistal axis −2 to 16 μg per limb or 1 ng per cell. Supernumerary limbs were also induced by these local implants and here there was a distinct position effect with the dorsal side causing the highest frequency. This reveals a possible effect of RA on the anteroposterior axis of regenerating limbs, but some of these supernumeraries were thought to arise from the irritant action of RA rather than a specific effect on pattern formation. The relevance of these results to those obtained on other systems is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848251
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of prednisolone and butyrate on agglutinability of HeLa cells by concanavalin A (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 788-790 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Agglutinability by concanavalin A was measured with HeLa65 cells grown with prednisolone or sodium butyrate, 2 compounds that increase the activity of the carcinoplacental form of alkaline phosphatase, an enzyme localized in membranes. Prednisolone enhanced concanavalin A agglutination approximately 3-fold while sodium butyrate had no effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990329
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  • 3
    Electronic Resource
    Electronic Resource
    Differentiation in Coprinus lagopus (1975)
    Springer
    Archives of microbiology 105 (1975), S. 257-260 
    Details
    ISSN: 1432-072X
    Keywords: Coprinus lagopus (sensu Buller) ; Fruit-body expansion ; Stipe elongation ; Growth localization ; Autonomy of stipe development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fruit-body expansion was studied in Coprinus lagopus (sensu Buller) following surgical procedures. Elongation occurred after denuding mushroom caps of essentially all peripheral scales. Young primordia (1–5 mm) failed to develop after vertical bisection. Older primordia (e. g. 10 mm) expanded 3–4-fold after vertical bisection or quadrisection, underwent autolysis and basidiospore production. An amorphous brown gel in the stipe lumen disappeared during development of bisected primordia. Stipes isolated from primordia expanded autonomously and exhibited negative geotropism when incubated upside down or when the stipe apex was removed. Displacement of charcoal particles dusted on intact stipes revealed the most active zone of expansion to be the upper mid-region of the stipe. Segmented stipes likewise showed most active elongation in the mid-region. Vertically bisected stipes also expanded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447144
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  • 4
    Electronic Resource
    Electronic Resource
    Incorporation of exogenous long-chain alcohols into bacteriochlorophyll c homologs by Chloroflexus aurantiacus (1995)
    Springer
    Archives of microbiology 163 (1995), S. 119-123 
    Details
    ISSN: 1432-072X
    Keywords: Key words Bacteriochlorophyll ; Chloroflexus ; Chlorosome ; Green bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chloroflexus aurantiacus grown in batch culture took up exogenous alcohols and incorporated these into bacteriochlorophyll c as the esterifying alcohol. It was possible to change the distribution of the naturally occurring homologs of bacteriochlorophyll c esterified with phytol, hexadecanol, and octadecanol by adding the appropriate alcohol. The corresponding homolog then made up at least 60% of the cellular bacteriochlorophyll c. It was also possible to obtain novel bacteriochlorophyll homologs not found in detectable amounts in control cells by adding fatty alcohols with short chains (C10, C12) or long chains (C20). These changes in bacteriochlorophyll composition had no detectable effects on the spectral properties of the chlorosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381785
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  • 5
    Electronic Resource
    Electronic Resource
    Differential magnetoreflection spectroscopy of doped and undoped II–VI semiconductor quantum wells (1997)
    Springer
    JETP letters 65 (1997), S. 45-52 
    Details
    ISSN: 1090-6487
    Keywords: 78.66.Mf ; 78.20.Ls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method has been developed for recording and analyzing the differential magnetoreflection (magnetotransmission) spectra of semiconductor structures with quantum wells. The method was used to determine the exciton g-factor in semimagnetic CdTe/(Cd, Mn)Te heterostructures with quantum wells. In nonmagnetic structures with quantum wells containing a two-dimensional electron gas, the excitonic damping depends on the spin state of the exciton. This effect is explained by the exchange contribution to exciton-electron scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567318
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  • 6
    Electronic Resource
    Electronic Resource
    Adenosine deaminase activity in livers of congenitally athymic nude mice (1974)
    Springer
    Cellular and molecular life sciences 30 (1974), S. 1247-1248 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Une forme de maladie humaine d'immunoinsuffisance grave combinée est associée à une insuffisance d'adénosine-déaminase dans les cellules de lymphe et dans d'autres tissus comprenant le foie, la rate et les érythrocytes des cultures de fibroblastes de la peau. Un modèle animal d'immuno-insuffisance combinée a été récememt créé dans une race de souris sans poils. Nous avons montré que chez ces souris immunologiquement déficientes l'activité de l'adénosine-déaminase est normale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945164
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  • 7
    Electronic Resource
    Electronic Resource
    Altered arterial connective tissue in racing greyhound dogs (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1426-1427 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Vascular collagen and elastin contents and the ratio of collagen/elastin (C/E) were studied in racing greyhound dogs, a breed which exhibits increased cardiac output. As compared to mongrel dogs, vascular C/E was lower, suggesting a greater distensibility of vessels as an adaptive response to hemodynamic stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923225
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  • 8
    Electronic Resource
    Electronic Resource
    Stability of tritiated thymidine during prolonged labelling of human blood leukocyte cultures (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 711-712 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Der Stoffwechsel des3H-Thymidins in Blut-Leukozyten wurde während langfristiger Inkubation studiert. Die Bedingungen waren dieselben, die gewöhnlich for Chromosomenpräparate angewendet werden. So gelang es, menschliche Leukocyten während 72 Stunden mit H3-markiertem Thymidin zu inkubieren, ohne dass das markierte Thymidin durch die Leukozyt-Thymidin-Phosphorylase zerstört wurde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944996
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  • 9
    Electronic Resource
    Electronic Resource
    Topological near-rings (1967)
    Springer
    Archiv der Mathematik 18 (1967), S. 485-492 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01899488
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  • 10
    Electronic Resource
    Electronic Resource
    The sources and levels of mercury in the sewage of a university campus (1975)
    Springer
    Bulletin of environmental contamination and toxicology 13 (1975), S. 397-400 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01721841
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