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  • Springer  (34)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • Elsevier
  • International Union of Crystallography
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  • 2015-2019
  • 1985-1989  (16)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Development genes and evolution 195 (1986), S. 499-505 
    ISSN: 1432-041X
    Schlagwort(e): DNA replication ; Embryonic gene transcription ; Heat shock-like proteins ; Mouse
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Inhibition of DNA replication in the 1-cell mouse embryo causes arrest in interphase. In such arrested cells the pattern of protein synthesis progresses as normal through the first cell cycle but does not show the characteristic changes that are associated with mitosis. Synthesis does occur of the 68/70 kd heat shock-like proteins, on the earliest detectable embryonic transcripts synthesised shortly after first cleavage in control embryos. However, the quantitative change in the pattern of protein synthesis, indicative of the major activation of the embryonic genome that normally occurs during G2 of the second cell cycle, is prevented.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 35 (1983), S. 755-761 
    ISSN: 1432-0827
    Schlagwort(e): Magnesium ; Mouse ; Mineralization ; Resoprtion ; Osteoclasts ; Bone turnover
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Summary The effect of magnesium (Mg) supplementation on bone metabolism has been studied in the normal young mouse. Weanling male mice were given Mg-supplemented drinking water (5 mM or 32 mM Mg) for 4 weeks. Mineral and skeletal changes were assessed by biochemical methods and by histomorphometric analysis of endosteal bone formation and resorption parameters evaluated on tetracycline double-labeled, undecalcified caudal vertebrae. Magnesium supplementation increased serum and urinary Mg concentrations and bone Mg content. Both the calcification rate and the extent of tetracycline double-labeled osteoid surface increased progressively in Mg-treated mice, whereas the mineralization lag time was shortened. The osteoblastic surface was reduced, leading to a fall in osteoid surface. Stimulation of bone mineralization was associated with a rise in extracellular calcium (Ca) and phosphorus (P) concentrations whereas serum 25-OHD and 1,25(OH)2D levels remained normal. The Mg supplementation increased the number of acid phosphatase stained chondroclasts and osteoclasts and the extent of resorbing surface showing histochemically stained osteoclasts. Although urinary OH-proline increased above normal, Ca, P, and cyclic adenylic acid (cAMP) excretion and phosphate concentration (TmP/GFR) remained normal, suggesting that parathyroid hormone (PTH) secretion was not altered. The trabecular bone volume remained normal, showing that the increased bone resorption was balanced by the stimulated bone mineralization. The results show that Mg supplementation influenced both bone formation and resorption in the young mouse, and that the stimulation of bone mineralization was the result of increased extracellular mineral availability. On the other hand, stimulation of osteoclastic bone resorption appeared to occur independently of PTH or of increased 1,25(OH)2D production. Therefore, this study suggests that Mg may controlin vivo bone metabolism by directly influencing bone resorbing cells activity.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 10 (1972), S. 302-313 
    ISSN: 1432-0827
    Schlagwort(e): Diphosphonates ; Bone resorption ; Mouse ; Pyrophosphate ; Tissue culture ; 45Calcium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Beschreibung / Inhaltsverzeichnis: Résumé Deux diphosphonates, le disodium-éthane-1-hydroxyle-1,1-diphosphonate (EHDP) et le disodium dichlorométhylène diphosphonate (Cl2MDP), inhibent la résorption osseuse, induite par des cellules au niveau de calottes craniennes, cultivées pendant 48 heuresin vitro, lorsque ces substances sont ajoutées au milieu. Le Cl2MDP est plus actif que l'EHDP, à des doses variant 0–16 μg P/ml. Le pyrophosphate et l'imidodiphosphate n'inhibent pas la résorption osseuse à des doses comparables. Lorsque les deux diphosphonates sont injectés à des sourisin vivo avant mise en culture, la résorption osseuse observéein vitro est considérablement réduite: à une dose de 10 μg P/g de poids corporel de Cl2MDP, elle est presque totalement inhibée. Cet effet est rapide et dure plusieurs jours. Les conséquences de ces résultats et la méthode d'essai d'inhibiteurs de la résorption osseuse par la méthode combinéein vivo/ in vitro sont envisagées.
    Kurzfassung: Zusammenfassung Zwei Diphosphonate, Dinatrium-äthan-1-hydroxy-1,1-diphosphonat (EHDP) und Dinatrium-Dichloromethylendiphosphonat (Cl2MDP), hemmen zellbedingte Knochenresorption von Mäuseschädeldächern, welche während 48 Stdin vitro kultiviert worden waren, wenn diese Substanzen dem Nährmedium zugegeben werden. Im Dosierungsbereich von 0–16 μg P/ml ist Cl2MDP wirksamer als EHDP. Pyrophosphat und Imidodiphosphat blockieren die Knochenresorption bei entsprechenden Dosen nicht. Wenn die zwei Diphosphonate Mäusenin vivo injiziert werden, bevor das Explantat hergestellt wird, ist die nachfolgende Knochenresorptionin vitro stark vermindert; bei einer Dosierung von 10 μg P/g Körpergewicht von Cl2MDP ist die Resorption fast gänzlich blockiert. Diese Wirkung erfolgt rasch und dauert während einigen Tagen an. Die Folgerungen aus diesen Ergebnissen sowie das Verfahren, Knochenresorptionshemmer mittels kombinierterin vivo/in vitro-Methode zu prüfen, werden diskutiert.
    Notizen: Abstract Two diphosphonates, disodium ethane-1-hydroxy-1,1-diphosphonate (EHDP) and disodium dichloromethyle diphosphonate (Cl2MDP), inhibit cell-mediated bone resorption of mouse calvaria cultivated for 48 hoursin vitro, when the compounds are added to the medium. Cl2MDP is more effective than EHDP over the dose range 0–16 μg P/ml. Pyrophosphate and imidodiophosphate do not block bone resorption at comparable dose levels. When the two diphosphonates are injected into micein vivo before explants are prepared, subsequent bone resorptionin vitro is considerably reduced; at a dose level of 10 μg P/g body weight of Cl2MDP it is almost completely blocked. This effect is rapid and persists for several days. The implications of these results and the method of testing inhibitors of bone resorption by the combinedin vivo/in vitro method are discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 71 (1986), S. 698-702 
    ISSN: 1432-2242
    Schlagwort(e): Antagonistic selection ; Body weight gain ; Mouse
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 128 (1972), S. 135-138 
    ISSN: 1432-0878
    Schlagwort(e): Spinal cord ; Mouse ; Myelinated neuronal soma ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Im Thorakalmark (Hinterhornbereich) einer Wildmaus wurde ein kleines Nervenzellperikaryon beobachtet, das vollständig von einer Markscheide umhüllt war. Die Zahl der Markscheidenlamellen variierte zwischen 7 und 12. An einer Stelle konnte ein sogenanntes inneres Mesoperikaryon nachgewiesen werden. Die Bedeutung dieses zufällig erhobenen Befundes ist vorerst noch offen.
    Notizen: Summary In the thoracic cord (posterior horn region) of a wild mouse, we have observed a small nerve cell soma completely enveloped by a myelin sheath. The number of myelin lamellae varied between 7 and 12. In one place, the existence of an inner ‘mesoperikaryon’ could also be shown. The significance of this fortuitous finding has not yet been explained.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 124 (1972), S. 465-478 
    ISSN: 1432-0878
    Schlagwort(e): Anterior pituitary ; Mouse ; in vitro ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Anterior pituitaries of mice were incubated for periods up to four hours in Krebs-Ringer bicarbonate glucose gassed with 95% O2∶5% CO2. The incubated explants survived and retained a fine structure that approximated the condition in situ. The few necrotic cells were sharply localized, and were found to be due to initial mechanical damage to the tissue. Some cells of the six granulated types exhibited slight but significant changes attributable to the liberation from the hypothalamic control: in LTH cells there was a release of preexisting granules and a development of cell organelles, whereas in other cell types there was an inhibition of release of granules and an enhanced digestion of the accumulated granules by the lysosomal system. Follicular cells responded uniquely to the changed environment by hypertrophy of the cytoplasm and were found to phagocytize cell debris. A part of non-epithelial elements of the gland showed a tendency to modulate cytologically.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 131 (1972), S. 329-346 
    ISSN: 1432-0878
    Schlagwort(e): Olfactory mucosa ; Mouse ; Glands of Bowman ; Light and electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das erste Auftreten der Glandulae olfactoriae in der olfaktorischen Region der Maus wird beschrieben. Die Struktur der Bowmanschen Drüse und ihre topologische Beziehung zu den übrigen zellulären Elementen im Riechepithel wird untersucht. Die Bedeutung des Sekrets für die Bildung des Deckhäutchens wird diskutiert. Die Bowmanschen Drüsen der Maus erreichen im letzten Viertel des intrauterinen Lebens die Lamina propria des Riechepithels. In den Endstücken finden sich dunkle, sekretreiche und helle, sekretarme Zellen. Die sezernierenden Zellen der Bowmanschen Drüsen sind nicht auf die Lamina propria beschränkt, sondern erstrecken sich bis in die untersten Anteile des Kernlagers im Riechepithel. Beim Austritt der Bowmanschen Drüsen aus dem Riechepithel in die Lamina propria konfluieren die Basalmembranen dieser Gewebeanteile miteinander. Die gemeinsame Basalmembran kann sich noch eine Strecke weit bis in den normalen Interzellularraum zwischen Drüsen- und Riechepithelanteilen einsenken. In den apikalen Anteilen des Riechepithels wird der Ausführungsgang von den benachbarten Sinnes- und Stützzellen nur durch eine normal breite Interzellularfuge getrennt. Im Ausführungsgang der Bowmanschen Drüse finden sich dunkle und helle auskleidende Zellen. Die durch Desmosomen miteinander verbundenen Epithelzellen der Ausführungsgänge zeigen Zeichen einer Sekretion. Die periphersten Ausläufer des Ausführungsgangepithels erstrecken sich lediglich bis in das Terminalplattenniveau der Stützzellen, mit denen sie sich durch desmosomenartige Kontaktzonen verbinden. In der Verlängerung der Ausführungsgänge wird das Lumen peripher des Terminalplattenniveaus von den apikalen Stützzellanteilen und deren Mikrovilli sowie von den obersten Anteilen der Dendriten, von den Riechköpfen und den Sinneshaaren der Rezeptorzellen umgrenzt. Im Lumen der Ausführungsgangverlängerung finden sich im Bereich des olfaktorischen Saumes flächenhafte Ansammlungen von Sekret. Das Sekret im intervillösen Raum des olfaktorischen Saumes zeigt eine besondere Affinität zu den Membranen der peripheren Sinneszellausläufer. In der intrauterinen Lebensphase ließ sich bisher kein Deckhäutchen feststellen. Die austrocknende Wirkung der Luft auf das Sekret der Bowmanschen Drüsen wird als Entstehungsmechanismus für das Deckhäutchen in Erwägung gezogen.
    Notizen: Summary First appearance, structure and topological relations of Bowmans' glands in the regio olfactoria of white mice are described. The importance of these glands for the formation of the terminal mucous cover of the olfactory epithelium is discussed. In the last quarter of intrauterine life the glands of Bowman reach the lamina propria. In the terminal portion of the glands dark cells with many secretory droplets and pale cells with only a few of them can be seen. Secretory active cells are localized in the basal part of the olfactory epithelium as well. When entering the lamina propria the irregular wide basement membrane of the glands joins that one of the epithelium. It is possible to follow up this joined basement membrane for a short distance between the glands and the cells of the olfactory epithelium. Peripheral to the very basal part of the olfactory epithelium there is no basement membrane around the glands' tissue. Receptors and sustentacular cells are separated from the gland only by a normal intercellular space. The epithelium of the ducts consists of dark and light cells as well. They are connected with the sustentacular cells by desmosomelike contacts. In its prolongation the lumen of Bowman's duct is lined by the apical portions of the sustentacular cells and their microvilli, and by dendrites, olfactory vesicles, and sensory cilia of the receptor cells. In the region of cilia and microvilli one can see masses of secretion which have confluenced. In the intervillous space its special affinity to the receptor's membranes is evident. During the intrauterine phase of life no terminal mucous cover could be demonstrated. The drying effect of the air as a possible reason for the origin of the terminal mucous cover is discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 162 (1975), S. 119-130 
    ISSN: 1432-0878
    Schlagwort(e): Adrenal Gland ; Mouse ; X zone ; Castration ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The secondary X zone induced by castration in the adrenal cortex of adult male mice was examined by electron microscopy and radioautography with 3H-thymidine. 10–15 days after castration a thin layer of small eosinophilic cells is formed in the inner-most cortex. Such eosinophilic cells contain irregulary shaped nuclei and spherical or ellipsoidal mitochondria with tubulolamellar cristae, 20–25 days after castration a prominent zone of small eosinophilic cells was clearly identified as the secondary X zone. The typical secondary X zone cells were characterized by the formation of peculiar mitochondrial complexes and whorled sER. The X zone cells with their characteristic organelles incorporated 3H-thymidine. The ultrastructure and formation of the secondary X zone were very similar to those of the primary X zone which appears during normal postnatal development. We demonstrate here the capacity of reticularis cells of adult male mice to transform into typical X zone cells following castration.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 164 (1975), S. 11-26 
    ISSN: 1432-0878
    Schlagwort(e): Intermediate lobe ; Mouse ; Growth and development ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The development of the intermediate lobe of the hypophysis was studied in the embryonic C3H mouse; at least four glands from embryos of every gestational day from 15 to 19 were examined. In the 16 day-old embryo prospective secretory cells proliferate at the centre of the intermediate lobe anlage. At the same stage cylindrical cells bordering the hypophyseal cleft begin to reorganize into marginal cells. By the end of fetal life marginal cells are well differentiated. In the 17 day-old embryo a few granular inclusions appear in some centrally located cells. Secretory cells increase in number during the following two embryonic days. Some of these cells contain polymorphic populations of granular and vesicular inclusions by gestational day 19. The possibility of a dual formation of secretory inclusions is discussed. The result implies that the onset of granule-formation by these cells is not contemporaneous with the start of production of melanophore-expanding substances, the presence of which has been detected by earlier biological assays.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 124 (1972), S. 387-405 
    ISSN: 1432-0878
    Schlagwort(e): Adenohypophysis ; Mouse ; Follicular cells ; Marginal cells ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Follicular cells in the mouse adenohypophysis were studied electron microscopically. These elements appear to be very similar to the marginal cells that delineate both sides of the hypophyseal cleft. The mouse differs from most other species in that the follicular cells in the pars distalis and the marginal cells look completely inactive in young, intact animals. This makes the mouse exceptionally favorable for correlating morphological changes in the cells of both types with changes in the physiological state of the animal. Different treatments applied in the present investigation all induced morphological reactions in the follicular and/or marginal cells; these reactions were generally similar. Thus, morphological changes in the follicular or marginal cells should be considered as general phenomena accompanying many changes in the physiological state of the animal, rather than as a specific result of the treatment applied. In three experiments, the follicular and marginal cells were involved in the digestion of waste material from other cells. It is suggested that the morphological changes in the other experiments should also be interpreted as signs of such an activity. In the pars tuberalis of the young, intact mouse the follicular cells may show characteristics that in the pars distalis are found only under experimental conditions. Therefore, the follicular cells in this part of the hypophysis are probably in an active state.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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