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  • 1985-1989  (1.421)
  • 1975-1979  (397)
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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Consecuencias de la evaporacion desde el complejo hidroelectrico El Chocon - Cerros Colorados (1) (1976)
    Buenos Aires : Serv. Meteor. Nac.
    Details Verfügbarkeit
    Signatur: MOP Per 223/C(15)
    Materialart: Monographie ausleihbar
    Seiten: 14 S.
    Serie: Fuerza Aerea Argentina : Publ. C 15
    Standort: MOP - Bitte bestellen
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Reissner's fiber, massa caudalis and ampulla caudalis in the spinal cord of lamprey larvae (Geotria australis) (1987)
    Springer
    Cell & tissue research 247 (1987), S. 359-366 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Reissner's fiber ; Massa caudalis ; Subcommissural organ ; Spinal cord ; Central canal ; Immunocytochemistry ; Lectin histochemistry ; Lamprey ; Geotria australis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The subcommissural organ (SCO), Reissner's fiber (RF) and its massa caudalis of lamprey larvae (Geotria australis) were investigated immunocytochemically by use of an antiserum raised against bovine RF as primary antibody. The affinities of RF and massa caudalis for Ricinus communis agglutinin I (RCA) with and without previous acid hydrolysis, concanavalin A (Con A), wheat-germ agglutinin (WGA), aldehyde fuchsin, and PAS reaction were also studied. SCO and massa caudalis were strongly immunoreactive, whereas RF proper was distinctly negative. RF did not react with Con A and RCA. Only the periphery of RF was WGA-positive. RCA showed affinity for RF only after acid hydrolysis. RF was homogeneously stained by the aldehyde-fuchsin and PAS-methods. At variance with RF proper, the periphery of the massa caudalis reacted with RCA without previous acid hydrolysis, but its core was WGA-positive and reacted with RCA only after hydrolysis. It is suggested that (i) RF has a coat of glycoproteins containing sialic acid as terminal residue, whereas the massa caudalis possesses a coat with galactose as terminal residue; (ii) in RF proper and the massa caudalis the spatial arrangement of glycoproteins might be different. Routine transmission electron-microscopic observations indicate that in larvae of Geotria australis an open communication exists between the ampulla caudalis and blood capillaries via large cavities or lacunae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00218317
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Intercalation of polar organic compounds into tin(IV) hydrogenphosphate monohydrate (1985)
    s.l. : American Chemical Society
    Inorganic chemistry 24 (1985), S. 1187-1190 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic00202a015
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal studies on Ni(II), Cu(II) and Pd(II) complexes of 6-amino-5-formyluracil and its N-methyl derivatives (1987)
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 1127-1137 
    Details
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das thermische Verhalten von 6-Amino-5-formyluracil (HFU), 6-Amino-1-methyl-5-formyluracil (1-HFU), 6-Amino-3-methyl-5-formyluracil (3-HFU) und 6-Amino-1,3-dimethyl-5-formyluracil (HDFU) wird beschrieben. Nur HDFU enthält Kristallwasser. Dehydratisierungs- und Schmelzenthalpiewerte wurden aus den DSC-Kurven berechnet. Auch über das thermische Verhalten neuer, durch Reaktion der obigen Pyrimidin-Derivate mit Ni(II)-, Cu(II)- und Pd(II)-Ionen erhaltenen Komplexe wird berichtet.
    Kurzfassung: Резюме Описано термическое поведение 6-амино-5-форм ил-, 6-амино-1-метил-5-формил-, 6а мино-З-метил-5-формили 6-амино-1,3-диметил-5-форми лурацилов. Показано, ч то только последнее соединени е содержит кристалли зационную воду. На основе кривых ДСК вычислены значения энтальпии д егидратации и плавле ния. Подобным образом изу чено также термическ ое разложение комплекс ов вышеприведенных п роизводных пиримидина с двухвал ентными никелем, медью и палла дием.
    Notizen: Abstract The thermal behaviour of 6-amino-5-formyluracil (HFU), 6-amino-1-methyl-5-formyluracil (1-MFU), 6-amino-3-methyl-5-formyluracil (3-HFU) and 6-amino-1,3-dimethyl-5-formyluracil (HDFU) is described. Only HDFU is shown to contain crystallization water. Dehydration and fusion enthalpy values have been calculated from the DSC curves. Likewise, the thermal behaviour of new complexes obtained by reaction between the above pyrimidine derivatives and Ni(II), Cu(II) and Pd(II) ions is reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01905167
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Light- and electron-microscopic investigation of the rat subcommissural organ grafted under the kidney capsule, with particular reference to immunocytochemistry and lectin histochemistry (1989)
    Springer
    Cell & tissue research 258 (1989), S. 499-514 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Subcommissural organ ; Secretory activity, neural control ; Transplantation ; Long-spacing collagen ; Immunocytochemistry ; Molecular markers (neuronal, glial) ; Electron microscopy ; Rat (Sprague-Dawley)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary There is increasing evidence that, in the rat, a serotonin-mediated neural input may have an inhibitory influence on the secretory activity of the subcommissural organ (SCO). In the present investigation the rat SCO was studied 7, 30 and 90 days after transplantation under the kidney capsule, an area devoid of local serotonin-containing nerves. The grafted tissue was examined by use of immunocytochemistry employing a series of primary antisera, lectin histochemistry and transmission electron microscopy. The grafted SCO survived transplantation and contained, in addition to secretory ependymal and hypendymal SCO-cells, also elements immunoreactive with antisera against glial fibrillary acidic protein or S-100 protein. In transplants, SCO-cells produced a material displaying the characteristic immunocytochemical and lectin-binding properties of SCO-cells observed under in-situ conditions. The ependymal cells lined 1–3 small cavities, which contained secretory material. A fully developed structural equivalent of Reissner's fiber was, however, never found. The immunocytochemical and ultrastructural study of the grafted SCO showed an absence of nerve fibers within the graft and suggested a state of enhanced secretory activity. A network of protruding basal lamina structures connected the secretory cells to the newly formed capillaries revascularizing the SCO. One week after transplantation, long-spacing collagen started to appear in expanded areas of such laminar networks and also in the perivascular space. It is suggested (i) that the formation of long-spacing forms of collagen is triggered by factors provided by the SCO-secretory cells, and (ii) that secretory material of the ependymal and hypendymal cells may reach the reticular extensions of the basal lamina. In contrast to the SCO in situ, the grafted SCO-cells showed a positive immunoreaction for neuron-specific enolase. They became surrounded by a S-100-immunoreactive glial sheath that separated them from other transplanted cell types and the adjacent kidney tissue of the host.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00218862
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Cytological changes in the pars distalis of the female rat hypophysis grafted under the kidney capsule (1979)
    Springer
    Cell & tissue research 199 (1979), S. 539-543 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Pars distalis ; Graft ; Ultrastructure ; Prolactin ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Intact female rats received transplants of two hypophysial partes distales under the kidney capsule. The plasma levels of prolactin were determined, and the ultrastructure of the grafted gland was studied 15, 45 and 90 days after the operation. Although prolactin levels in the three experimental groups were significantly higher than those in control rats, a decrease in prolactin level was detected in the 45-day samples. Parallel ultrastructural changes suggest that between the 45th and 90th postoperative day a process is initiated leading to hyperplasia and hypertrophy of prolactotrophs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00236089
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Reissner's fiber and the wall of the central canal in the lumbo-sacral region of the bovine spinal cord (1985)
    Springer
    Cell & tissue research 240 (1985), S. 649-662 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Reissner's fiber ; Subcommissural organ ; Ependyma ; Immunocytochemistry ; Electron microscopy ; Bovine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Reissner's fiber (RF) of the subcommissural organ (SCO), the central canal and its bordering structures, and the filum terminale were investigated in the bovine spinal cord by use of transmission electron microscopy, histochemical methods and light-microscopic immunocytochemistry. The primary antisera were raised against the bovine RF, or the SCO proper. Comparative immunocytochemical studies were also performed on the lumbo-sacral region of the rat, rabbit, dog and pig. At all levels of the bovine spinal cord, RF was strongly immunoreactive with both antisera. From cervical to upper sacral levels of the bovine spinal cord there was an increasing number of ependymal cells immunostainable with both antisera. The free surface of the central canal was covered by a layer of immunoreactive material. At sacral levels small subependymal immunoreactive cells were observed. From all these structures sharing the same immunoreactivity, only RF was stained by the paraldehyde-fuchsin and periodicacid-Schiff methods. At the ultrastructural level, ependymal cells with numerous protrusions extending into the central canal were seen in the lower lumbar segments, whereas cells displaying signs of secretory activity were principally found in the ependyma of the upper sacral levels. A few cerebrospinal fluid-contacting neurons were observed at all levels of the spinal cord; they were immunostained with an anti-tubulin serum. The lumbo-sacral segments of the dog, rat and rabbit, either fixed by vascular perfusion or in the same manner as the bovine material, did not show any immunoreactive structure other than RF. The possibilities that the immunoreactive ependymal cells might play a secretory or an absorptive role, or be the result of post-mortem events, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00216353
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Light and electron-microscopic immunocytochemistry and lectin histochemistry of the subcommissural organ: Evidence for processing of the secretory material (1986)
    Springer
    Cell & tissue research 243 (1986), S. 545-559 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Subcommissural organ ; Glycoproteins ; Secretory process ; Immunocytochemistry ; Lectin histochemistry ; Rat ; Vertebrates
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The subcommissural organ (SCO) of the rat was investigated by use of histochemical and immunocytochemical methods at the light and electron-microscopic levels. Consecutive thin methacrylate sections were stained with the pseudoisocyanin (Psi), immunoperoxidase (IMC; employing an antiserum against Reissner's fiber, AFRU), periodic acid-Schiff (PAS) and periodic acid-silver methenamine (SM) techniques, and reacted with six types of lectins. Psi, SM, concanavalin A (Con A) and IMC were also used for double and triple sequential staining of the same section. Increasing dilutions of AFRU (from 1∶1000 to 1∶200 000) were used for immunostaining of serial paraffin sections. In addition, ultrastructural localization of (i) Con A-binding sites and (ii) immunoreactive secretory material was performed. Some of these procedures were also applied to the ophidian and canine SCO. Con A-positive, Psi-positive and immunoreactive materials coexisted within the same cisternae of the rough endoplasmic reticulum. The Golgi apparatus lacked Con A-positive and immunoreactive substances. Apical secretory granules and secreted material lying on the surface of the SCO showed (i) the highest affinity for AFRU, but were (ii) Con A-negative, and (iii) wheat-germ agglutinin-, PAS and SM-positive. Reissner's fiber displayed a low affinity for AFRU. It is suggested that the SCO secretes N-linked glycoproteins, the carbohydrate and protein moeities of which undergo (i) a maturation process before being released, and (ii) some kind of modification(s) after their release into the ventricle. The perivascular secretory cells of the dog SCO might secrete a material different from that secreted by the ependymal cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00218061
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Ultrastructural immunocytochemical study of the massa caudalis of the subcommissural organ-Reissner's fiber complex in lamprey larvae (Geotria australis): Evidence for a terminal vascular route of secretory material (1987)
    Springer
    Cell & tissue research 247 (1987), S. 367-376 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Subcommissural organ ; Reissner's fiber ; Massa caudalis ; Vasculature ; Ultrastructural immunocytochemistry ; Lamprey ; Geotria australis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The massa caudalis of the subcommissural organ-Reissner's fiber complex of lamprey larvae (Geotria australis) was studied immunocytochemically at the ultrastructural level by use of the immunoperoxidase-silver methenamine procedure. An antiserum raised against bovine Reissner's fiber was utilized as primary antibody. The caudalmost portion of the central canal and its ampulla caudalis communicate, via wide intercellular spaces in their dorsal wall, with large cavities or lacunae. In addition, distinct openings in the dorsal wall of the ampulla establish an open communication between the latter and the lacunae. The lacunae are lined by slender processes of cells of unknown nature. No junctional complexes can be observed between these cells, which lack a basal lamina. The lacunae communicate with structures resembling blood capillaries, however, they are devoid of a basal lamina. These peculiar vessels, in turn, are in direct communication with characteristic blood capillaries. Reissner's fiber (RF) and its massa caudalis are strongly immunoreactive with the antiserum used. The wide intercellular spaces in the dorsal wall of the central canal and the ampulla, as well as the lumina of the (i) lacunae, (ii) modified vessels and (iii) blood capillaries are filled with a flocculent, strongly immunoreactive material. No immunoreactive material was found outside these structures. Thus, the blood capillaries appear to represent the only final target of RF-material arriving at the ampulla caudalis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00218318
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Remarks on gauge variables and singular lagrangians (1977)
    Springer
    International journal of theoretical physics 16 (1977), S. 659-661 
    Details
    ISSN: 1572-9575
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01812223
    Standort Signatur Erwartet Verfügbarkeit
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