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  • 1
    Electronic Resource
    Electronic Resource
    Bridgehead-bridgehead communication in untransannulated phosphatrane ZP(ECH2CH2)3N systems (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 2214-2220 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00337a008
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of Ion-Conducting Ormolytes: Structure-Property Relationships (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 127-134 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00038a007
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  • 3
    Electronic Resource
    Electronic Resource
    Einige Bemerkungen über die Ersatzgeschlechtstiere vonReticulitermes (1956)
    Springer
    Insectes sociaux 3 (1956), S. 129-130 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung An Laboratoriumszuchten vonReticulitermes lucifugus Rossi undReticulitermes flavipes Kollar (aus den Hamburger Befallsgebieten) werden Beobachtungen zur Biologie der Ersatzgeschlechtstiere mitgeteilt. Für die Durchführung dieser Beobachtungen wurden besondere “Schaunester” eingerichtet. Folgende Punkte der beobachteten Verhaltensweisen werden hier hervorgehoben: Die Nymphen der Ersatzgeschlechtstiere sammeln sich stets in “Herden” von 80–100 Einzeltieren und werden von einer Gruppe Arbeiter (als “Hütehunde”) bewacht. Die Arbeiter halten die Nymphen auf einem engen Raum zusammen und versuchen andere Nestgenossen von den Nymphen fernzuhalten. Alle ein bis zwei Tage wechseln die “Herden” ihren Standort. Das Weiterziehen geschieht gleichfalls in Form von “Herden”. Die Ernährung der Nymphen geschieht auf stomodealem Wege durch die Arbeiter. *** DIRECT SUPPORT *** A0180089 00007
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02230673
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  • 4
    Electronic Resource
    Electronic Resource
    Two portions of the supraspinatus muscle: a new finding about the muscles macroscopy by dissection and magnetic resonance imaging (1994)
    Springer
    Surgical and radiologic anatomy 16 (1994), S. 101-104 
    Details
    ISSN: 1279-8517
    Keywords: Supraspinatus muscle ; Anatomy ; MR imaging ; Fusiform muscle ; Straplike muscle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les coupes axiales d'épaule obtenues en IRM montrent une bande linéaire centrale à l'intérieur du m. supra-épineux, vide, qui ne semble pas représenter uniquement le tendon de ce muscle. En raison de l'importance du m. supraépineux dans les syndrômes douloureux de l'épaule, nous avons étudié l'architecture fibreuse de ce muscle, en comparant 30 imageries par résonnance magnétique nucléaire et 49 dissections cadavériques. Nous avons trouvé que le m. supra-épineux était composé de deux parties distinctes. La longueur moyenne de la partie ventrale est de 88 mm et celle de la partie dorsale de 106 mm. L'angle du tendon central qui est formé par les fibres des deux parties musculaires, fait 50° avec le plan frontal. Les deux parties musculaires agissent probablement différemment dans les mouvements du bras. Ces constatations semblent être importantes pour la physiopathologie des ruptures de la coiffe des rotateurs, qui sont principalement situées en avant, dans la partie ventrale du muscle et dans le tendon central excentrique.
    Notes: Summary Axial MR images of the shoulder joint reveal a central linear band within the supraspinatus muscle void of signal which seems not to represent the only tendon of this muscle. Due to the importance of the supraspinatus muscle for the painful impingement syndrome of the shoulder we studied the fibrous architecture of this muscle comparing 30 MR images and 49 cadaver dissections. We found the supraspinatus muscle to be composed of two distinct portions. The mean length of the ventral portion is 88 mm and of the dorsal portion 106 mm. The angle of the central tendon which is formed by fibers of both muscle portions relative to the frontal plane is 50°. Both muscle portions probably act differently in moving the arm. This finding seems to be important for the pathophysiology of rotator cuff tears which are mainly located anteriorly within the ventral muscle portion and the eccentric central tendon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01627931
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  • 5
    Electronic Resource
    Electronic Resource
    The extravascular contractile system in the human placenta (1994)
    Springer
    Anatomy and embryology 190 (1994), S. 541-548 
    Details
    ISSN: 1432-0568
    Keywords: Human placenta ; Smooth muscle-like cells ; Perivascular contractile sheath ; Nitric oxide synthase type I ; Dipeptidyl peptidase IV
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the human placenta, besides the fetal blood vessel system a second extravascular contractile system exists. It is localized in the chorionic plate and runs in a longitudinal direction and adjacent to fetal blood vessels into the stem villi, where it forms perivascular contractile sheaths. Characteristically, cells of the extravascular contractile system are extremely long and spindle-shaped and give rise to fine cell processes, by which they obviously contact each other or insert into the basement membrane of the trophoblast. They show immunoreactivity with desmin, vimentin, α-actin, myosin, nitric oxide synthase type I (brain form) and dipeptidyl peptidase IV. The ultrastructure suggests that cells of the extravascular contractile system are related to smooth muscle cells, including subpopulations with myofibroblastic features. In stem villi a few cells are nitric oxide synthase type I immunoreactive. These cells are thought to be specialized smooth-muscle-like cells of the extravascular contractile system or cells of the extravascular contractile system related to paraneurons that generate nitric oxide, which, in turn, may modulate the tone of perivascular contractile sheaths. The high dipeptidyl peptidase IV activity suggests that modulation of the extravascular contractile system may also occur by substance P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190104
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  • 6
    Electronic Resource
    Electronic Resource
    Radioeisenstudien über Veränderungen des Eisenstoffwechsels nach experimenteller Leberschädigung (1958)
    Springer
    Journal of molecular medicine 36 (1958), S. 628-633 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung In tierexperimentellen Untersuchungen am Kaninchen wurde der Einfluß von experimenteller Leberschädigung auf den Eisenstoffwechsel mit der Radioeisentechnik studiert und den Normalbefunden gegenübergestellt. Dabei zeigte sich, daß eine vorwiegende Schädigung der epithelialen Parenchymanteile durch Tetrachlorkohlenstoff nicht nur die Plasmaeisenkonzentration erhöht, sondern auch den Abstrom und den Umsatz des Plasmaeisens beschleunigt. Bei vorwiegender Schädigung der reticuloendothelialen Anteile durch kolloidales Radiogold hingegen werden Eisenabstrom aus dem Plasma und Plasmaeisenturnover — bei erhöhter Plasmaeisenkonzentration — herabgesetzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01480780
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  • 7
    Electronic Resource
    Electronic Resource
    Isozymes and general protein patterns as taxonomic markers in the taxon Nephtyidae (Annelida Polychaeta) (1994)
    Springer
    Marine biology 119 (1994), S. 31-38 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seven Nephtys species and one species of the genus Aglaophamus (collected from different European tidal and subtidal locations between 1989 and 1991) were compared with respect to six isozyme systems (α-amylase, esterase, hexokinase, malate dehydrogenase, malic enzyme, phosphoglucoseisomerase) as well as with respect to general protein patterns with non-specific staining. The proteins were obtained from the tissue (proboscis, individual segments) of single individuals, the species of which had previously been accurately determined, and were separated by isoelectric focusing (IEF) in polyacrylamide gels. The enzymes were identified by their specific catalytic activities, and the general proteins were visualized by silver staining. All the isozymes proved to be monomorphic within each of the various polychaete populations. With a single exception, it was impossible to distinguish geographically separated populations of the same species, because the band patterns were completely consistent within the species. The individual enzymes varied in their suitability for species differentiation. Only with respect to esterase and α-amylase could all species be distinguished; the other enzymes studied were identical in morphologically similar species. In contrast, each species could be identified by its general protein pattern, although some species differed from others in the position of a few bands only. Individuals of N. hombergii, N. caeca and N. cirrosa with abnormally shaped parapodia, as well as juvenile nephtyids, could be unequivocally assigned to their respective species by IEF. Only in the case of N. longosetosa were two morphological variants found to differ in their electrophoretic characteristics; one of them is interpreted as a new species, not previously described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350103
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Ca2+ and other divalent cations on K+-evoked force production of slow muscle fibers from Rana esculenta and Rana pipiens (1992)
    Springer
    The journal of membrane biology 129 (1992), S. 211-220 
    Details
    ISSN: 1432-1424
    Keywords: slow muscle fibers ; K+ contractures ; divalent cations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Slow muscle fibers were dissected from cruralis muscles of Rana esculenta and Rana pipiens. Isometric contractures were evoked by application of K+-rich Ringer's containing Ca2+, Ni2+, Co2+, Mn2+ or Mg2+. High (7.2 mmol/liter) external Ca2+ concentration raised, 0 Ca2+ lowered the K+ threshold. Replacing Ca2+ by Ni2+ or Co2+ had an effect similar to that of high Ca2+ Ringer's. In Mg2+ Ringer's the K+ concentration-response curve was flattened. These effects were observed already after short exposure times in both species of slow fibers. When Ca2+ was removed for long periods of time the slow fibers of R. esculenta lost their contractile response to application of high K+ concentrations much more quickly than those of R. pipiens, while the response to caffeine (20 mmol/liter) was maintained. Upon readmission of Ca2+ contractile ability was quickly restored in the slow fibers of both R. esculenta and R. pipiens, but the effects of Ni2+ (or Co2+, Mn2+ and Mg2+) were much larger in R. esculenta than in R. pipiens slow fibers. It is concluded that divalent cations have two different sites of action in slow muscle fibers. K+ threshold seems to be affected through binding to sites at the membrane surface; these sites bind Ni2+ and Co2+ more firmly than Ca2+. The second site is presumably the voltage sensor in the transverse tubular membrane, which controls force production, and where Ca2+ is the most effective species of the divalent cations examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219516
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  • 9
    Electronic Resource
    Electronic Resource
    Differential regulation of HLA class I genes by interferon (1990)
    Springer
    Immunogenetics 31 (1990), S. 245-252 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Allele-specific differences in the regulation of HLA class I genes by type I interferon (IFN) were observed after transfection of eight HLA-B,-A, or-C genes into mouse L cells. HLA-B7 and -Bw64 gene expression was significantly more inductible by type I IFN than the genes coding for HLA-B27, HLA-B51, HLA-B38, HLA-B39, HLA-Cw3, and HLA-A2 antigens. Modification of the 5′ end of HLA-B7 and HLA-B27 genes revealed the presence of enhancer sequences responding to IFN treatment in the 5′ untranslated region of HLA-B7, but not of HLA-B27 and suggested further, independently acting enhancer elements downstream of the transciption initiation site. Comparison of 5′ enhancer region sequences in correlation with type I IFN inducibility of the different HLA class I alleles indicated that the exchange of only two nucleotides in the interferon response sequence (IRS) or enhancer A region of HLA-B7 or -Bw64 could account for nonregulated promoters in all other HLA-A,-B or -C alleles analyzed. Thus, type I IFN stimulation of HLA class I genes in mouse L cells appears to predominantly operate in most alleles by a mechanism targeted to enhancer sequences downstream of the gene's transcription initiation site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204896
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  • 10
    Electronic Resource
    Electronic Resource
    Beitrag zur Ermittlung der Pilzbesiedlung bei natürlichen Böden und ihrer Kennzeichnung durch ein besonderes Isolierungsverfahren (1959)
    Springer
    Archives of microbiology 32 (1959), S. 224-233 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Es wird für die Ermittlung der natürlichen Vergesellschaftung der Pilzflora im Boden und für ihre unmittelbare Isolierung ein Verfahren angegeben, bei dem die Struktur des Bodens und die im Boden lebenden Pilzthalli weitgehend erhalten bleiben. Die Oberfläche von Strukturproben wird in naturfeuchtem Zustand mit einem Nährboden übersprüht, so daß auf der Bodenoberfläche eine dünne, geschlossene Agardecke entsteht. Die Hyphen im Boden durchwachsen diese Nährbodenschicht und bilden auf ihrer Oberseite Sporenträger aus. Auf diese Weise entsteht ein Bild der natürlichen Pilzbesiedlung des Bodens, das die Zusammensetzung der Bodenpilzflora unmittelbarer wiedergibt als das Plattengußverfahren. Gegenüber anderen direkten Isolierungsmethoden bringt das neue Verfahren die Pilzflora eines größeren Bodenausschnittes zur Entwicklung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409343
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