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  • 11
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Micron 25 (1994), S. 171-187 
    ISSN: 0968-4328
    Schlagwort(e): Cellulose-glucuronoxylan composites ; cell wall ; helicoidal structure ; self-assembly
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Biology of the Cell 73 (1991), S. 173-178 
    ISSN: 0248-4900
    Schlagwort(e): cellulose ; liquid-crystal ; quince ; self-assembly ; xylans
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 13
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Biology of the Cell 67 (1989), S. 209-220 
    ISSN: 0248-4900
    Schlagwort(e): cell walls ; cellulose ; fiber composite ; helicoids
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 14
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 763 (1995), S. 0 
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 15
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Several phosphodiester antisense oligodeoxynucleotides (ODNs) corresponding to untranslated and translated amino-terminal regions of NMDA-R1 messenger RNA7"9 were synthesized. An 18-mer, NMDARlAS/c, designed to correspond to nucleotides 4-21 (ref. 7), which directly follow the translation ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 16
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 41 (1985), S. 644-646 
    ISSN: 1420-9071
    Schlagwort(e): Prolactin ; inbred mouse strains ; dopamine neurons ; hypothalamus ; pituitary
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Mice of the BALB/cJ strain have more dopamine neurons than mice of the CBA/J strain. We now report that BALB/cJ mice have less circulating and pituitary prolactin than CBA/J mice, a relationship expected from the difference in tuberoinfundibular dopamine neuron number.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 17
    Digitale Medien
    Digitale Medien
    Springer
    Planta 170 (1987), S. 60-73 
    ISSN: 1432-2048
    Schlagwort(e): Amyloid ; Cell wall breakdown ; β-Galactosidase ; Reserve mobilisation ; Seed germination ; Storage wall ; Tamarindus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The structure and breakdown of galactoxyloglucan (GXG)-rich cells was studied from cotyledons of Tamarindus indicus L. The depletion of GXG was followed at different levels: quantitative, histochemical and cytochemical. At the ultrastructural level two probes were used: one general for polysaccharides (periodic acid — thiocarbohydrazide — silver proteinate test), the other specific for the terminal galactosyl residues of GXG (β-galactosidase-gold complex). They were complemented by water-extraction of the GXG and analysis of the constituting monosaccharides by gas chromatography. Despite their collenchymateous aspect and the chemical similarity of the reserve GXG with the structural xyloglucan of growing walls, the thickened storage walls are not interpretable as being an hypertrophied primary wall. The tamarind cells produce an original type of wall construction in which GXGs are sequestered in a sort of homomolecular bulk. There is no evidence for intussusception of the molecules within a network of cellulose. The bulk of GXG is sandwiched between two thin layers: the outer is comparable to a regular primary wall, the inner behaves like a barrier during GXG withdrawal. Temporal and spatial patterns of GXG-mobilisation lead to the definition of a sequence of stages of cell activities (premobilising, mobilising, postmobilising). They are synchronized with the growth of the seedling axis, the duration and characteristics of the stages being subordinated to the location of the cells within the organ. Cell lysis is initiated in close relationship with intramural cavities. The development of digestion pockets results in a highly digested wall. The barrier prevents any engulfing of the cytoplasm in the wall clefts and creates an increasing free space. The attack front of digestion is always sharp. During all steps, the monosaccharide composition remains stable. At the end of GXG depletion, the storage wall is withdrawn and cells are rendered in a parenchyma-like state. The breakdown is not a complete wall collapse but an original controlled and limited wall-thinning. The data lead to the speculation that the hydrolytic activities result from a complementation between precursors relinquished by the cytoplasm and factors already present in the storage wall.
    Materialart: Digitale Medien
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  • 18
    ISSN: 1432-0878
    Schlagwort(e): Immunohistochemistry ; Paraganglia ; Aging ; Catecholamines ; Catecholamine-synthesizing enzymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The catecholamine-synthesizing enzymes, tyrosine hydroxylase, dopamine-β-hydroxylase and phenylethanolamine-N-methyltransferase were examined by immunohistochemistry in hypertrophied paraganglia of aged male Fischer-344 rats. All paraganglionic cells reacted with antibodies against tyrosine hydroxylase. Dopamine β-hydroxylase was identified in most paraganglionic cells, indicating that they synthesized norepinephrine. A variable number of paraganglia were positive for phenylethanolamine-N-methyltransferase, which suggested that they synthesized epinephrine. The formaldehyde-induced fluorescence method demonstrated greenish-yellow fluorescence or yellowish-brown fluorescence. The intensity of the fluorescence was in the same range as in adrenal medullary cells. The observations indicate that paraganglia are capable of synthesizing epinephrine.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 19
    ISSN: 1615-6102
    Schlagwort(e): Erwinia chrysanthemi ; Pectate lyase ; Pectin degradation ; Plant cell wall
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Erwinia chrysanthemi is a soft-rot pathogenic enterobacterium that provokes maceration of host plant tissues by producing extracellular cell-wall-degrading enzymes, among which are pectate lyases, pectin methyl esterases, and cellulases. Cell wall degradation in leaves and petiole tissue of infectedSaintpaulia ionantha plants has been investigated in order to define the structural and temporal framework of wall deconstruction. The degradation of major cell wall components, pectins and cellulose, was studied by both classical histochemical techniques (Calcofluor and periodic acid-thiocarbohydrazide-silver proteinate staining) and immunocytochemistry (tissue printing for detection of pectate lyases; monoclonal antibodies JIM5 and JIM7 for detection of pectic substrates). The results show that the mode of progression of the bacteria within the host plant is via the intercellular spaces of the parenchyma leaf and the petiole cortex. Maceration symptoms and secretion of pectate lyases PelA, -D, and -E can be directly correlated to the spread of the bacteria. Wall degradation is very heterogeneous. Loss of reactivity with JIM5 and JIM7 was progressive and/or clearcut. The primary and middle lamella appear to be the most susceptible regions of the wall. The innermost layer of the cell wall frequently resists complete deconstruction. At the wall intersects and around intercellular spaces resistant domains and highly degraded domains occurred simultaneously. All results lead to the hypothesis that both spatial organisation of the wall and accessibility to enzymes are very highly variable according to regions. The use of mutants lacking pectate lyases PelA, -D, -E or -B, -C confirm the important role that PelA, PelD, and PelE play in the rapid degradation of pectins from the host cell walls. In contrast, PelB and PelC seem not essential for degradation of the wall, though they can be detected in leaves infected with wild-type bacteria. With Calcofluor staining, regularly localised cellulose-rich and cellulose-poor domains were observed in pectic-deprived walls.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 20
    ISSN: 1615-6102
    Schlagwort(e): Cell wall ; Helicoidal texture ; Modelling ; Flexibility ; Cellulose
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The concept of the cell wall organized in a helicoidal pattern was outlined. When studied in transmission electron microscopy, the observed textures appear as a deceptive figure,i.e., as a “trompe l'oeil”. Difficulties—both technological and visual in the reconstitution of the actual geometry (exposure of the microfibrillar framework, 3-dimensional and 4-dimensional restoration), and the interest of simple modelling to understand the changes in cellulose orientation according to space and time are emphasized. The morphogenesis of helicoidal walls presents two main characteristics: it is both very defined and flexible, thus adaptable to varied programs of differentiation and to different environmental conditions. The observations of various cell examples and of responses to experimental treatments, lead to the following considerations: a) the shift of cellulose occurs continuously with time through a constant mutual angle. The wall seems to be built up as an indefinite continuum and forms a monotonous oscillatory system (unvarying motion); b) the shift of cellulose occurs through a mutual angle variable with time (varying motion, change from monotonous helicoid to bimodal helicoid, or sporadic bursts with arrested motion). The helicoidal wall appears as a fibrous composite with multifunctional possibilities ranging from fluidity to stiffness. The helicoidal assembly is remarkably adaptable to different physiological conditions of growth and specialization.
    Materialart: Digitale Medien
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