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  • 11
    Electronic Resource
    Electronic Resource
    Induktive Definitionen und Dilatoren (1988)
    Springer
    Archive for mathematical logic 27 (1988), S. 51-60 
    Details
    ISSN: 1432-0665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper we give a new and comparatively simple proof of the following theorem by Girard [1]: “If ∀x∈ $${\cal O}$$ ∃y∈ $${\cal O}$$ ψ(x,y) (where the relationψ is arithmetic and positive in Kleene's $${\cal O}$$ ), then there exists a recursive DilatorD such that ∀α≧ω∀x∈ $${\cal O}$$ 〈α∃y∈ $${\cal O}$$ 〈D(α) ψ(x, y).” The essential feature of our proof is its very direct definition of the dilatorD. Within a certain infinitary cutfree system of “inductive logic” (which in fact is a modification of Girard's system in [1]) we construct in a uniform way for each ordinalα a derivation Tα of the formula ∀x ∈ $${\cal O}$$ 〈α∃y∈ $${\cal O}$$ ψ(x, y), and then defineD immediately from the family (Tα)α∈On. Especially we set D(α):=Kleene-Brouwer length of (Tα).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625834
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  • 12
    Electronic Resource
    Electronic Resource
    Effects of alloxan-induced diabetes mellitus on the metabolism of the rat placenta (1986)
    Springer
    Archives of gynecology and obstetrics 237 (1986), S. 155-163 
    Details
    ISSN: 1432-0711
    Keywords: Placenta ; Insufficiency ; Alloxan ; Diabetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Biochemical changes in the placenta were studied using alloxan-induced diabetes mellitus in the female rat. In comparison with a control group (n = 13) the placentas of the diabetic animals (n = 12) had significantly higher glucose, glycogen and protein levels. It was, however, shown that this supply of substrate was inadequately utilised for energy, as ATP/ADP quotient was lower and the ADP content was significantly higher. Metabolism still appeared to take place under aerobic conditions, as evidenced by the unchanged lactate levels. In terms of the protein content of the placentas, the activity of the enzymes we investigated (GOT, GPT, LDH, G-6-PDH, MDH, ICDH) was lowered by 25–44%. These results support the idea of global placental insufficiency in diabetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02133859
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  • 13
    Electronic Resource
    Electronic Resource
    Surface morphology of the perfused rabbit ovary (1987)
    Springer
    Archives of gynecology and obstetrics 240 (1987), S. 33-43 
    Details
    ISSN: 1432-0711
    Keywords: Ovary ; Surface epithelium ; Perfusion ; Rabbit ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using transmission electron microscopy we examined the morphology of the surface epithelium of the isolated and perfused rabbit ovary after an ovulatory dose of HCG. Rupture of follicles occurred in vitro approximately 13 h after HCG-injection and 6 h after the start of perfusion. The ultrastructural changes during the perfusion were similar to those occurring in vivo. The perfused ovarian epithelium had villous processes of varied architectural complexity with squamoid and cuboid epithelial cells. The superficial cells contained pinocytotic vesicles, coated and noncoated endocytotic caveolae, and occasional vacuoles. Dense bodies were more commonly found in vitro than in vivo. Occasionally structures similar to “Call-Exner-bodies” were found on the surface epithelium near to preovulatory follicles. Intercellular spaces of various sizes were also numerous. Disappearance of surface epithelium in the apex of follicles was often observed and the matrix of the tunica albuginea consisted of dissociated fibers and degenerating cells. This study showed that the isolated perfused rabbit ovary can serve as a model for studying the biology and pathology of ovarian surface epithelium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02134062
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  • 14
    Electronic Resource
    Electronic Resource
    Lymphoretikuläre Zellen der Dezidua: eine immuhistologische und elektronenmikroskopische Studie (1989)
    Springer
    Archives of gynecology and obstetrics 245 (1989), S. 170-170 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02417229
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  • 15
    Electronic Resource
    Electronic Resource
    Growth ofZymomonas mobilis CP4 on mannitol (1988)
    Springer
    Applied microbiology and biotechnology 29 (1988), S. 275-281 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The ethanologenZymomonas mobilis has a restricted substrate range, namely glucose, fructose and sucrose. It would be useful to expand its substrate range to include other carbohydrates.Z. mobilis was screened for growth on 30 different carbohydrates and organic acids. A single spontaneous mutant,Z mobilis CP4.60, was isolated which illustrated feeble growth on mannitol as the sole carbohydrate source after three months of incubation. Growth ofZ. mobilis CP4.60 for several months in continuous culture with excess mannitol, and including a round of NTG (N-methyl-N'-nitro-N-nitrosoguanidine) mutagenesis in the chemostat, led to the isolation a sequential series of mutants (CP4.62, CP4.64 and CP4.66), each with improved growth rates on mannitol. Metabolism of mannitol byZ. mobilis is oxygen-dependent, resulting in limited production of ethanol and incresed production of lactic acid. This is an initial example of extension of the substrate range ofZymomonas. The conversion of mannitol to fructose could be via an altered alcohol dehydrogenase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939321
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  • 16
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    Oswald Spengler - eine Schlüsselfigur im konservativen Denken des 20. Jahrhunderts (1989)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 37:2 (1989) 139 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1989-037-02-000005
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  • 17
    Electronic Resource
    Electronic Resource
    Zeitschriften (1943)
    Springer
    Journal of molecular medicine 22 (1943), S. 752-759 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01774375
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  • 18
    Electronic Resource
    Electronic Resource
    Partial characterization of chitin degrading enzymes from two euphausiids, Euphausia superba and Meganyctiphanes norvegica (1988)
    Springer
    Polar biology 9 (1988), S. 115-122 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chitinase and N-acetyl-β-D-glucosaminidase have been demonstrated in Meganyctiphanes norvegica and in Euphausia superba and partly characterized. The enzymes from both species have broad pH-optima (maxima around pH 5.0) and temperature optima between 40 and 50°C. The enzymes are relatively stable; even at about 45°C half of the enzyme activity is retained after 30 min incubation. The presence of fluoride does not affeet enzymatic activity. Chitinase activity appears in three different molecular masses, N-acetyl-β-D-glucosaminidases in two different forms. pH and temperature optima, thermal stability and kinetic properties of the two enzymes are strikingly similar in the polar E. superba versus the boreal euphausiid M. norvegica. Enzyme activity in the lower temperature range is still high, whereas activation energies are low in both euphausiids. This suggests a functional adaptation to a low temperature range in seawater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442038
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  • 19
    Electronic Resource
    Electronic Resource
    Moult cycle and seasonal activities of chitinolytic enzymes in the integument and digestive tract of the Antarctic krill, Euphausia superba (1989)
    Springer
    Polar biology 9 (1989), S. 311-317 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chitinolytic activity was quantified in euphausiid integuments in relation to moulting. In Euphausia superba, shortly before moult the activity increased in chitinase and N-acetyl-β-D-glucosaminidase to pronounced maxima indicating the onset of massive resorption of cuticular material. Enzymatic activity of E. superba corresponded to values in Meganyctiphanes norvegica, a boreal euphausiid which was investigated for comparison, as well as in insecta. Antarctic krill from winter catches displayed activities comparable to summer material suggesting physiological preparation for moulting. Accordingly, moulting did not cease during winter. Both enzymes were also active in the digestive tract in summer as well as in winter krill: chitin containing food of phyto-and zooplankton origin is digestable. Seasonally stable activities did not point to changes in nutritional preference. In contrast to other crustacea, digestive enzyme activity was not reduced around moult, suggesting a high capacity to continuously utilize food sources including chitin. This property can be linked directly to the high energy need caused by the necessity of constant active swimming in both krill species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00287429
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  • 20
    Electronic Resource
    Electronic Resource
    Fluoride in tissues of Krill Euphausia superba Dana and Meganyctiphanes norvegica M. Sars in relation to the moult cycle (1987)
    Springer
    Polar biology 7 (1987), S. 43-50 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The fluoride content of whole animals and different tissues of the euphausiid species Euphausia superba and Meganyctiphanes norvegica was analyzed by two different and improved methods of isolation and determination. In contrast to other authors our findings show that the internal organs (muscle, hepatopancreas and hemolymph) contain less than 6 ppm d.w. fluoride this being the same order of magnitude as for vertebrates. The high concentrations reported by other authors must be mainly due to contamination of the soft tissue during storage (post-mortem migration of fluoride from shell) and/or contamination caused by minute fractions of cuticle during dissection. Over 99% of the total fluoride content is located in the cuticle (i.e. integument) of the euphausiids (2600 ppm/d.w. in E. superba and 3300 ppm/d.w. in M. norvegica in pleon cuticle). Analysis of F- levels in relation to the moulting cycle showed that the uptake in both euphausiids occurs at a comparable and fast rate during the same physiological phase shortly after moult, parallel to the general construction of the cuticle. The internal organs show homeostasis in respect to fluoride. Accordingly, no internal deposition takes place, and F- is reaccumulated from the external medium at each moult.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286823
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